/* ═══════════════════════════════════════════
   尖鳍科技 · 企业官网
   黑白几何 · B2B 咨询风格
   ═══════════════════════════════════════════ */

:root {
  --bg: #ffffff;
  --bg-subtle: #ffffff;
  --bg-dark: #000000;
  --fg: #000000;
  --fg-muted: rgba(0, 0, 0, 0.55);
  --fg-light: rgba(255, 255, 255, 0.55);
  --line: #000000;
  --black: #000000;
  --white: #ffffff;

  /* 鳍形按钮：左尖 + 右 V 口 */
  --fin-a: 10px;
  --fin-n: 10px;
  --bevel: 6px;

  --fin-gap: 3px;

  --font: Inter, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --container: 1080px;
  --header-h: 68px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: auto;
  overflow-x: hidden;
}

body {
  overflow-x: hidden;
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  padding-top: var(--header-h);
}

img { display: block; max-width: 100%; }

/* 钛 SDK anchor 滚动时避开固定顶栏 */
#top,
#stats,
#about,
#products {
  scroll-margin-top: 80px;
}

#offerings,
#ttd-services,
#banbai-services {
  scroll-margin-top: 80px;
}

.page-products .section--showcase {
  min-height: min(680px, 82svh);
}

.page-products .showcase-split {
  min-height: min(680px, 82svh);
}

.page-products .header {
  backdrop-filter: none;
  background: #ffffff;
}

/* 产品页 · 减轻动画开销，避免滚动卡顿 */
.page-products .showcase-screen__grid,
.page-products .showcase-split::before,
.page-products .showcase-panel__logo img {
  animation: none !important;
}

.page-products .showcase-panel,
.page-products .showcase-in {
  animation-duration: 0.55s;
}

.page-products .brand__logo--animate {
  animation-duration: 0.65s;
  filter: none;
  transform: translateX(24px);
}

.page-products .brand__name--animate {
  animation-duration: 0.5s;
  animation-delay: 0.2s;
}

.page-products .section--offerings {
  content-visibility: auto;
  contain-intrinsic-size: auto 900px;
}

.page-products .offerings-step {
  opacity: 1;
  transform: none;
}

.page-products .showcase-scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  z-index: 2;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.45);
  pointer-events: none;
  animation: showcaseHintPulse 2.4s ease-in-out infinite;
}

@keyframes showcaseHintPulse {
  0%, 100% { opacity: 0.35; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.75; transform: translateX(-50%) translateY(4px); }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .showcase-scroll-hint {
    animation: none;
    opacity: 0.55;
  }
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Header ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 100;
  color: var(--black);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--black);
}

.header__inner {
  display: flex;
  align-items: center;
  height: var(--header-h);
  gap: 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  overflow: visible;
  color: var(--black);
}

.brand__logo-wrap {
  display: flex;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  overflow: visible;
}

.brand__logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

/* 与 hero logo 同步：从右滑入 + 半透明模糊 */
.brand__logo--animate {
  opacity: 0;
  filter: blur(10px);
  transform: translateX(72px);
  animation: brandLogoEnter 1.8s cubic-bezier(0.22, 1, 0.36, 1) 0.05s forwards;
  transition: opacity var(--ease), filter var(--ease);
}

@keyframes brandLogoEnter {
  to {
    opacity: 0.72;
    filter: blur(0.6px);
    transform: translateX(0);
  }
}

.brand:hover .brand__logo--animate {
  opacity: 0.92;
  filter: blur(0);
}

.brand__name--animate {
  opacity: 0;
  transform: translateX(12px);
  animation: brandNameEnter 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.55s forwards;
}

@keyframes brandNameEnter {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.brand__name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--black);
}

.header__actions {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.header__actions--fin {
  gap: var(--fin-gap);
}

.nav--fin {
  display: flex;
  align-items: center;
  gap: var(--fin-gap);
  margin-left: 0;
}

/* 页刷新 · 导航从右往左、由低到高渐入 */
.header__actions--fin .nav--fin .btn--fin {
  opacity: 0;
  transform: translate(10px, 8px);
  animation: navFinEnter 0.55s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.header__actions--fin .nav--fin .btn--fin:nth-child(5) { animation-delay: 0.50s; }
.header__actions--fin .nav--fin .btn--fin:nth-child(4) { animation-delay: 0.62s; }
.header__actions--fin .nav--fin .btn--fin:nth-child(3) { animation-delay: 0.74s; }
.header__actions--fin .nav--fin .btn--fin:nth-child(2) { animation-delay: 0.86s; }
.header__actions--fin .nav--fin .btn--fin:nth-child(1) { animation-delay: 0.98s; }

@keyframes navFinEnter {
  to {
    opacity: 1;
    transform: translate(0, 0);
  }
}

.header__cta {
  flex-shrink: 0;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--fg);
  transition: transform var(--ease), opacity var(--ease);
}

.menu-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 16px 24px 20px;
  border-top: 1px solid var(--line);
  background: var(--white);
  color: var(--black);
}

.mobile-nav a {
  padding: 12px 0;
  font-size: 14px;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--line);
}

.mobile-nav a:last-child { border-bottom: none; }

.mobile-nav:not([hidden]) { display: flex; }

/* ── 按钮体系 ── */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 24px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
  cursor: pointer;
  border: none;
  isolation: isolate;
  overflow: hidden;
  transition:
    background var(--ease),
    color var(--ease),
    border-color var(--ease),
    box-shadow var(--ease),
    transform var(--ease);
  -webkit-tap-highlight-color: transparent;
}

.btn:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

.btn:active { transform: translateY(1px); }

/* 鳍形 · 左尖 + 右 V 口（对应 logo 折角） */
.btn--fin {
  --fin-a: 10px;
  --fin-n: 10px;
  padding: 0 calc(20px + var(--fin-n)) 0 calc(16px + var(--fin-a));
  clip-path: polygon(
    0% 50%,
    var(--fin-a) 0%,
    100% 0%,
    calc(100% - var(--fin-n)) 50%,
    100% 100%,
    var(--fin-a) 100%
  );
}

.btn--fin:hover { z-index: 10; }

/* 主按钮 */
.btn--primary {
  color: var(--white);
  background: var(--black);
}

.btn--primary:not(.btn--fin) {
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--bevel)),
    calc(100% - var(--bevel)) 100%,
    0 100%
  );
}

.btn--primary:hover {
  background: var(--white);
  color: var(--black);
  box-shadow: inset 0 0 0 1px var(--black);
}

/* 描边按钮 */
.btn--outline {
  color: var(--black);
  background: var(--white);
  border: 1px solid var(--black);
}

.btn--outline:hover {
  background: var(--black);
  color: var(--white);
}

/* 鳍形幽灵 */
.btn--ghost {
  color: var(--fg-muted);
  background: var(--white);
}

.btn--ghost:hover {
  color: var(--black);
  background: var(--white);
  box-shadow: inset 0 0 0 1px var(--black);
}

/* 深色底反色 */
.btn--invert {
  color: var(--black);
  background: var(--white);
}

.btn--invert:not(.btn--fin) {
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--bevel)),
    calc(100% - var(--bevel)) 100%,
    0 100%
  );
}

.btn--invert:hover {
  background: var(--black);
  color: var(--white);
  box-shadow: inset 0 0 0 1px var(--white);
}

.btn--ghost-light {
  color: rgba(255, 255, 255, 0.72);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.24);
}

.btn--ghost-light:hover {
  color: var(--white);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.45);
}

.nav .btn.is-current {
  box-shadow: inset 0 0 0 1px var(--black);
}

.btn--sm {
  height: 36px;
  font-size: 13px;
  --bevel: 5px;
}

.btn--sm.btn--fin {
  padding: 0 calc(16px + var(--fin-n)) 0 calc(12px + var(--fin-a));
  --fin-a: 8px;
  --fin-n: 8px;
}

.btn--lg {
  height: 52px;
  font-size: 15px;
  padding: 0 32px;
  --bevel: 8px;
}

.btn--lg.btn--fin {
  padding: 0 calc(28px + var(--fin-n)) 0 calc(20px + var(--fin-a));
  --fin-a: 12px;
  --fin-n: 12px;
}

/* header 鳍形组 · 紧凑 + 纯黑 */
.header__actions--fin .btn--fin,
.header__actions--fin .header__cta {
  height: 32px;
  font-size: 12px;
  padding: 0 calc(10px + var(--fin-n)) 0 calc(8px + var(--fin-a));
  --fin-a: 6px;
  --fin-n: 6px;
  color: var(--white);
  background: var(--black);
}

.header__actions--fin .btn--fin:hover,
.header__actions--fin .header__cta:hover {
  background: var(--white);
  color: var(--black);
  box-shadow: inset 0 0 0 1px var(--black);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-top: 8px;
}

.hero__actions .btn--fin + .btn--fin {
  margin-left: 0;
}

.hero__actions .btn--lg {
  min-width: 148px;
  padding-left: 28px;
  padding-right: 28px;
}

/* ── Hero ── */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--line);
  min-height: clamp(480px, 68vh, 640px);
  overflow-anchor: none;
}

.hero__logo {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(440px, 58vw);
  height: auto;
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  filter: blur(10px);
  transform: translate(calc(-50% + 55vw), -50%);
  animation: heroLogoSlide 2s cubic-bezier(0.22, 1, 0.36, 1) 0.15s forwards;
}

@keyframes heroLogoSlide {
  to {
    transform: translate(-50%, -50%);
    opacity: 0.2;
    filter: blur(8px);
  }
}

.hero__slant {
  position: absolute;
  top: -20%;
  right: -5%;
  width: 55%;
  height: 140%;
  background: var(--black);
  transform: skewX(-18deg);
  opacity: 0.04;
  pointer-events: none;
  z-index: 0;
  animation: heroSlantDrift 12s ease-in-out infinite alternate;
}

@keyframes heroSlantDrift {
  from { transform: skewX(-18deg) translateX(0); opacity: 0.04; }
  to   { transform: skewX(-18deg) translateX(-24px); opacity: 0.07; }
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black 30%, transparent 95%);
  animation: heroGridPulse 8s ease-in-out infinite alternate;
}

@keyframes heroGridPulse {
  from { opacity: 0.35; }
  to   { opacity: 0.65; }
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  min-height: inherit;
  padding: 72px 24px 88px;
}

.hero__content {
  max-width: 640px;
}

.hero-animate {
  opacity: 0;
  animation: heroFadeIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.hero__inner .hero__title { animation-delay: 0.1s; }
.hero__inner .hero__subtitle { animation-delay: 0.22s; }
.hero__inner .hero__actions { animation-delay: 0.34s; }

@keyframes heroFadeIn {
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .hero__logo,
  .hero__slant,
  .hero__grid,
  .hero-animate,
  .brand__logo--animate,
  .brand__name--animate,
  .header__actions--fin .nav--fin .btn--fin {
    animation: none !important;
    opacity: 1;
    transform: none;
    filter: none;
  }

  .hero__logo {
    opacity: 0.15;
    filter: blur(8px);
    transform: translate(-50%, -50%);
  }

  .brand__logo--animate {
    opacity: 0.72;
    filter: blur(0.6px);
  }
}

.eyebrow {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 24px;
}

.eyebrow--dark { color: var(--fg-light); }

.hero__title {
  font-size: clamp(36px, 5.5vw, 56px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.04em;
  margin-bottom: 20px;
  max-width: 11em;
}

.hero__subtitle {
  font-size: clamp(15px, 2vw, 18px);
  font-weight: 400;
  color: var(--fg-muted);
  margin-bottom: 36px;
  letter-spacing: 0.02em;
  max-width: 22em;
  line-height: 1.5;
}

.section,
.stats,
.hero,
.blade-nav {
  scroll-margin-top: 68px;
}

/* ── 首页 · 刀片导航（竖向平行四边形） ── */
.page-home .stats {
  position: relative;
  z-index: 3;
  margin-bottom: -52px;
}

.page-home .blade-nav {
  position: relative;
  z-index: 1;
  padding: 96px 0 88px;
  background: #050505;
  border-bottom: none;
  overflow: hidden;
}

.blade-nav {
  padding: 56px 0 72px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  overflow: visible;
}

/* ── 刀片区 · 机房氛围背景 ── */
.blade-nav__scene {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.blade-nav__photo {
  position: absolute;
  inset: -8% -4%;
  background:
    url("assets/home/blade-datacenter.jpg") center 42% / cover no-repeat;
  filter: grayscale(100%) contrast(1.12) brightness(0.48);
  transform: scale(1.06);
  animation: bladePhotoDrift 18s ease-in-out infinite alternate;
}

@keyframes bladePhotoDrift {
  from { transform: scale(1.06) translate3d(0, 0, 0); }
  to   { transform: scale(1.1) translate3d(-1.2%, -1%, 0); }
}

.blade-nav__mesh {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 55% at 50% 38%, rgba(255, 255, 255, 0.07), transparent 62%),
    radial-gradient(circle at 18% 72%, rgba(255, 255, 255, 0.04), transparent 42%),
    radial-gradient(circle at 82% 68%, rgba(255, 255, 255, 0.05), transparent 38%);
}

.blade-nav__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, transparent 8%, black 28%, black 78%, transparent 96%);
  opacity: 0.55;
}

.blade-nav__glass {
  position: absolute;
  left: 50%;
  top: 54%;
  width: min(760px, 94vw);
  height: min(360px, 72%);
  transform: translate(-50%, -50%) skewX(-8deg);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.14),
    0 24px 80px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(28px) saturate(140%);
  -webkit-backdrop-filter: blur(28px) saturate(140%);
}

.blade-nav__sheen {
  position: absolute;
  inset: -40% -20%;
  background: linear-gradient(
    105deg,
    transparent 38%,
    rgba(255, 255, 255, 0.045) 48%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0.045) 52%,
    transparent 62%
  );
  transform: translateX(-28%);
  animation: bladeSheen 9s ease-in-out infinite;
}

@keyframes bladeSheen {
  0%, 100% { transform: translateX(-32%); opacity: 0.35; }
  50%      { transform: translateX(32%); opacity: 0.75; }
}

.blade-nav__fade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.72) 14%, rgba(0, 0, 0, 0.18) 42%, rgba(0, 0, 0, 0.55) 78%, #000 100%),
    linear-gradient(90deg, #000 0%, transparent 16%, transparent 84%, #000 100%);
}

.blade-nav__wrap {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
}

.blade-nav__row {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  min-height: 300px;
  padding: 0 8px;
}

.blade-nav__blade {
  position: relative;
  flex: 0 0 96px;
  height: 280px;
  margin-left: -22px;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--white);
  background: var(--black);
  clip-path: polygon(22% 0, 100% 0, 78% 100%, 0% 100%);
  box-shadow: 12px 0 36px rgba(0, 0, 0, 0.35);
  transition:
    transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    height 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    background 0.25s ease,
    color 0.25s ease,
    box-shadow 0.35s ease;
  opacity: 0;
  transform: translateY(36px);
  will-change: transform, opacity, height;
}

.blade-nav__blade:first-child {
  margin-left: 0;
}

.blade-nav__blade--1 { z-index: 1; }
.blade-nav__blade--2 {
  z-index: 2;
  background: rgba(255, 255, 255, 0.92);
  color: var(--fg);
  box-shadow: 12px 0 32px rgba(0, 0, 0, 0.28);
}

.blade-nav__blade--2::before {
  content: "";
  position: absolute;
  inset: 0;
  clip-path: inherit;
  border: 1px solid var(--line);
  pointer-events: none;
}

.blade-nav__blade--3 {
  z-index: 3;
}

.blade-nav__blade--4 {
  z-index: 4;
  background: rgba(255, 255, 255, 0.92);
  color: var(--fg);
  box-shadow: 12px 0 32px rgba(0, 0, 0, 0.28);
}

.blade-nav__blade--4::before {
  content: "";
  position: absolute;
  inset: 0;
  clip-path: inherit;
  border: 1px solid var(--line);
  pointer-events: none;
}

.blade-nav__blade--5 {
  z-index: 5;
}

.blade-nav__blade.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.blade-nav__blade--1.is-visible { transition-delay: 0.04s; }
.blade-nav__blade--2.is-visible { transition-delay: 0.12s; }
.blade-nav__blade--3.is-visible { transition-delay: 0.2s; }
.blade-nav__blade--4.is-visible { transition-delay: 0.28s; }
.blade-nav__blade--5.is-visible { transition-delay: 0.36s; }

.blade-nav__blade:hover {
  height: 308px;
  transform: translateY(-8px);
  z-index: 10;
  box-shadow: 16px 8px 36px rgba(0, 0, 0, 0.12);
}

.blade-nav__blade--2:hover,
.blade-nav__blade--4:hover {
  background: var(--black);
  color: var(--white);
}

.blade-nav__blade.is-current {
  background: var(--black);
  color: var(--white);
}

.blade-nav__blade.is-current::after {
  content: "";
  position: absolute;
  bottom: 18px;
  left: 50%;
  width: 4px;
  height: 4px;
  margin-left: -2px;
  background: currentColor;
  border-radius: 50%;
  opacity: 0.55;
}

.blade-nav__label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.24em;
  padding: 8px 0;
  user-select: none;
}

@media (max-width: 640px) {
  .page-home .stats {
    margin-bottom: -36px;
  }

  .page-home .blade-nav {
    padding: 72px 0 64px;
  }

  .blade-nav__glass {
    width: 96vw;
    height: 78%;
    backdrop-filter: blur(18px) saturate(130%);
    -webkit-backdrop-filter: blur(18px) saturate(130%);
  }

  .blade-nav {
    padding: 40px 0 48px;
  }

  .blade-nav__row {
    min-height: 240px;
    transform: scale(0.82);
    transform-origin: center bottom;
  }

  .blade-nav__blade {
    flex: 0 0 72px;
    height: 216px;
    margin-left: -18px;
  }

  .blade-nav__blade:hover {
    height: 236px;
    transform: translateY(-6px);
  }

  .blade-nav__label {
    font-size: 13px;
    letter-spacing: 0.18em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .blade-nav__photo,
  .blade-nav__sheen {
    animation: none;
  }

  .blade-nav__blade {
    opacity: 1;
    transform: none;
    transition: background 0.2s ease, color 0.2s ease;
  }

  .blade-nav__blade:hover {
    height: 280px;
    transform: none;
  }
}

/* ── Stats ── */
.stats {
  background: #000000;
  color: #ffffff;
  border-bottom: 1px solid #000000;
  padding: 40px 0;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 28px 16px;
  background: #000000;
  text-align: center;
}

.stat__num {
  font-size: clamp(32px, 4.5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  color: #ffffff;
}

.stat__label {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.55);
}

@media (max-width: 768px) {
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat {
    padding: 24px 12px;
  }
}

@media (max-width: 480px) {
  .stats__grid {
    grid-template-columns: 1fr;
  }
}

/* ── Sections ── */
.section {
  padding: 88px 0;
  border-bottom: 1px solid var(--line);
}

.section--dark {
  background: var(--bg-dark);
  color: var(--white);
  border-bottom: none;
}

.section-head {
  margin-bottom: 48px;
}

.section-head--light .section-head__sub {
  color: var(--fg-light);
}

.section-num {
  display: block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  margin-bottom: 12px;
}

.section--dark .section-num { color: var(--fg-light); }

.section-head h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section-head__sub {
  margin-top: 12px;
  font-size: 15px;
  color: var(--fg-muted);
  max-width: 36em;
}

/* ── About ── */
.section--about {
  padding-top: 96px;
  padding-bottom: 96px;
}

.about-header {
  margin-bottom: 56px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.about-header h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr min(380px, 36%);
  gap: 48px 64px;
  align-items: start;
  margin-bottom: 64px;
}

.about-main {
  min-width: 0;
}

.about-story__lead {
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  color: var(--fg);
}

.about-story__text {
  font-size: 15px;
  line-height: 1.9;
  color: var(--fg-muted);
  margin-bottom: 20px;
}

.about-story__text:last-child {
  margin-bottom: 0;
}

.about-story__text strong {
  color: var(--fg);
  font-weight: 600;
}

.about-aside {
  position: sticky;
  top: 96px;
}

.about-quote {
  margin: 0;
  padding: 32px 28px;
  background: var(--black);
  color: var(--white);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 12px),
    calc(100% - 12px) 100%,
    0 100%
  );
}

.about-quote__mark {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 16px;
}

.about-quote p {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.88);
  font-style: normal;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.about-card {
  position: relative;
  background: var(--bg);
  padding: 32px 28px 28px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.about-card__num {
  display: block;
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
  color: rgba(0, 0, 0, 0.06);
  margin-bottom: 20px;
}

.about-card h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
  position: relative;
}

.about-card p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.75;
  position: relative;
}

.about-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--black);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--ease);
}

.about-card:hover::before {
  transform: scaleX(1);
}

.about-points {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 48px;
  background: var(--line);
  border: 1px solid var(--line);
}

.about-points li {
  font-size: 13px;
  color: var(--fg-muted);
  padding: 20px 18px;
  background: var(--bg);
  line-height: 1.65;
  letter-spacing: 0.01em;
}

@media (max-width: 900px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-aside {
    position: static;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-points {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .about-points {
    grid-template-columns: 1fr;
  }

  .section--about {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}

/* ── Cases ── */
.section--cases {
  padding: 112px 0;
  min-height: min(980px, 100svh);
  border-bottom: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section--cases .container {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.section--cases .section-head {
  margin-bottom: 48px;
}

.section--cases .cases-panels {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.section--cases .case-panel {
  flex: 1;
}

.cases-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.cases-tab {
  appearance: none;
  font: inherit;
  cursor: pointer;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: transparent;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-align: center;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.cases-tab:hover {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.35);
}

.cases-tab.is-active {
  color: var(--black);
  background: var(--white);
  border-color: var(--white);
}

.cases-panels {
  position: relative;
}

.case-panel {
  padding: 44px 40px 48px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  min-height: 420px;
  display: flex;
  flex-direction: column;
}

.case-panel[hidden] {
  display: none;
}

.case-panel__head {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 28px;
}

.case-panel__num {
  flex-shrink: 0;
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
  color: rgba(255, 255, 255, 0.12);
}

.case-panel__head h3 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.case-panel__lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--fg-light);
  max-width: 42em;
}

.case-panel__points {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 0 0 32px;
  flex: 1;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.case-panel__points li {
  padding: 22px 24px;
  font-size: 15px;
  line-height: 1.75;
  min-height: 88px;
  display: flex;
  align-items: center;
  color: rgba(255, 255, 255, 0.78);
  background: rgba(0, 0, 0, 0.35);
}

.case-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: auto;
}

.cases-more {
  margin-top: 32px;
  text-align: center;
}

.cases-more__link {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.72);
  letter-spacing: 0.02em;
  transition: color var(--ease);
}

.cases-more__link:hover {
  color: var(--white);
}

.cases-tab {
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 900px) {
  .cases-tabs {
    grid-template-columns: repeat(2, 1fr);
  }

  .case-panel__points {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .cases-tabs {
    grid-template-columns: 1fr;
  }

  .case-panel {
    padding: 28px 22px;
  }

  .case-panel__head {
    flex-direction: column;
    gap: 12px;
  }
}

/* ── Showcase · 荣誉出品 · 双栏 ── */
.section--showcase {
  padding: 0 !important;
  background: #000000;
  border-bottom: none;
}

.showcase-screen {
  display: flex;
  flex-direction: column;
  background: #000000;
  position: relative;
  overflow: hidden;
}

.showcase-screen__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 20%, transparent 75%);
  pointer-events: none;
  animation: showcaseGridDrift 24s linear infinite;
}

@keyframes showcaseGridDrift {
  from { background-position: 0 0; }
  to { background-position: 56px 56px; }
}

.showcase-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 44px 96px minmax(240px, 1fr);
  align-items: stretch;
  gap: 24px;
  padding: 40px;
  min-height: min(880px, 96svh);
  background: transparent;
  position: relative;
  z-index: 1;
}

.showcase-split::before {
  content: "";
  position: absolute;
  top: 40px;
  bottom: 40px;
  left: 50%;
  width: 1px;
  background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.2) 20%, rgba(255, 255, 255, 0.2) 80%, transparent);
  transform: translateX(-50%);
  pointer-events: none;
  animation: showcaseDividerPulse 3s ease-in-out infinite;
}

@keyframes showcaseDividerPulse {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.85; }
}

.showcase-panel {
  display: grid;
  grid-row: span 3;
  grid-template-rows: subgrid;
  align-content: start;
  padding: 36px 36px 40px;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  min-height: 0;
  transition:
    transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.35s ease;
}

.showcase-panel--ttd {
  animation: showcasePanelInLeft 0.95s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.showcase-panel--banbai {
  animation: showcasePanelInRight 0.95s cubic-bezier(0.22, 1, 0.36, 1) 0.12s both;
}

@keyframes showcasePanelInLeft {
  from {
    opacity: 0;
    transform: translateX(-36px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes showcasePanelInRight {
  from {
    opacity: 0;
    transform: translateX(36px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.showcase-in {
  animation: showcaseInUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.showcase-in--1 { animation-delay: 0.2s; }
.showcase-in--2 { animation-delay: 0.32s; }
.showcase-in--3 { animation-delay: 0.44s; }

.showcase-panel--banbai .showcase-in--1 { animation-delay: 0.28s; }
.showcase-panel--banbai .showcase-in--2 { animation-delay: 0.4s; }
.showcase-panel--banbai .showcase-in--3 { animation-delay: 0.52s; }

@keyframes showcaseInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.showcase-panel__shine {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    115deg,
    transparent 42%,
    rgba(255, 255, 255, 0.07) 50%,
    transparent 58%
  );
  transform: translateX(-120%);
  pointer-events: none;
  z-index: 2;
}

.showcase-panel--banbai .showcase-panel__shine {
  background: linear-gradient(
    115deg,
    transparent 42%,
    rgba(0, 0, 0, 0.04) 50%,
    transparent 58%
  );
}

.showcase-panel:hover .showcase-panel__shine {
  animation: showcaseShine 0.75s ease forwards;
}

@keyframes showcaseShine {
  to { transform: translateX(120%); }
}

.showcase-panel:hover {
  transform: translateY(-6px);
}

.showcase-panel--ttd:hover {
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.45);
  border-color: rgba(255, 255, 255, 0.28);
}

.showcase-panel--banbai:hover {
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.12);
}

.showcase-panel--ttd {
  background: #000000;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.showcase-panel--banbai {
  background: #ffffff;
  color: #000000;
  margin: 0;
  height: auto;
  align-self: stretch;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.04);
}

.showcase-panel--banbai::after {
  display: none;
}

.showcase-panel__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 44px;
  min-height: 44px;
  margin-bottom: 0;
  position: relative;
  z-index: 1;
}

.showcase-panel__kicker {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.4;
}

.showcase-panel__sec {
  display: inline-block;
  margin-right: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.showcase-panel--ttd .showcase-panel__kicker {
  color: rgba(255, 255, 255, 0.45);
}

.showcase-panel--banbai .showcase-panel__kicker {
  color: rgba(0, 0, 0, 0.4);
}

.showcase-panel__badge {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 5px 12px;
  border: 1px solid currentColor;
  position: relative;
  z-index: 1;
}

.showcase-panel--ttd .showcase-panel__badge {
  border-color: rgba(255, 255, 255, 0.35);
  color: rgba(255, 255, 255, 0.88);
}

.showcase-panel--ttd .showcase-panel__badge sup {
  font-size: 0.65em;
  vertical-align: super;
}

.showcase-panel--banbai .showcase-panel__badge {
  border-color: rgba(0, 0, 0, 0.2);
  color: rgba(0, 0, 0, 0.65);
}

.showcase-panel__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 96px;
  min-height: 96px;
  padding: 0;
  position: relative;
  z-index: 1;
  background: transparent;
}

.showcase-panel__logo img {
  display: block;
  width: 96px;
  height: 96px;
  object-fit: contain;
  flex-shrink: 0;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  animation: showcaseLogoFloat 5s ease-in-out infinite;
}

.showcase-panel--banbai .showcase-panel__logo img {
  animation-delay: 0.6s;
}

@keyframes showcaseLogoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.showcase-panel--ttd .showcase-panel__logo img {
  width: auto;
  height: 72px;
  max-width: 100%;
  object-fit: contain;
  opacity: 1;
  visibility: visible;
}

.showcase-panel:hover .showcase-panel__logo img {
  animation: none;
  transform: scale(1.06) translateY(-4px);
}

.showcase-panel__foot {
  position: relative;
  z-index: 1;
  align-self: stretch;
  display: grid;
  grid-template-rows: 36px 56px auto 1fr auto;
  height: 100%;
  min-height: 240px;
  padding-top: 28px;
}

.showcase-panel__foot h3 {
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0;
  line-height: 1.2;
  align-self: end;
}

.showcase-panel__foot h3 sup {
  font-size: 0.55em;
  font-weight: 500;
  vertical-align: super;
  opacity: 0.6;
}

.showcase-panel__foot p {
  font-size: 14px;
  line-height: 1.75;
  max-width: 28em;
  margin: 0;
  min-height: 56px;
  align-self: start;
}

.showcase-panel--ttd .showcase-panel__foot p {
  color: rgba(255, 255, 255, 0.72);
}

.showcase-panel--banbai .showcase-panel__foot p {
  color: rgba(0, 0, 0, 0.55);
}

.showcase-panel__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 16px 0 0;
  align-self: start;
}

.showcase-panel__tags li {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border: 1px solid currentColor;
  transition:
    transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
    background 0.35s ease,
    border-color 0.35s ease;
}

.showcase-panel:hover .showcase-panel__tags li:nth-child(1) { transition-delay: 0.02s; }
.showcase-panel:hover .showcase-panel__tags li:nth-child(2) { transition-delay: 0.06s; }
.showcase-panel:hover .showcase-panel__tags li:nth-child(3) { transition-delay: 0.1s; }

.showcase-panel:hover .showcase-panel__tags li {
  transform: translateY(-2px);
}

.showcase-panel--ttd:hover .showcase-panel__tags li {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.45);
}

.showcase-panel--banbai:hover .showcase-panel__tags li {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.28);
}

.showcase-panel--ttd .showcase-panel__tags li {
  border-color: rgba(255, 255, 255, 0.28);
  color: rgba(255, 255, 255, 0.8);
}

.showcase-panel--banbai .showcase-panel__tags li {
  border-color: rgba(0, 0, 0, 0.15);
  color: rgba(0, 0, 0, 0.55);
}

.showcase-panel__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: end;
  margin-top: 0;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding-bottom: 2px;
  border-bottom: 2px solid currentColor;
  transition: gap 0.35s ease, opacity 0.35s ease;
}

.showcase-panel:hover .showcase-panel__cta {
  gap: 16px;
}

.showcase-panel__cta::after {
  content: "→";
  display: inline-block;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.showcase-panel:hover .showcase-panel__cta::after {
  transform: translateX(4px);
  animation: showcaseArrowNudge 0.9s ease-in-out infinite;
}

@keyframes showcaseArrowNudge {
  0%, 100% { transform: translateX(4px); }
  50% { transform: translateX(8px); }
}

@media (prefers-reduced-motion: reduce) {
  .showcase-screen__grid,
  .showcase-split::before,
  .showcase-panel,
  .showcase-in,
  .showcase-panel__logo img,
  .showcase-panel:hover .showcase-panel__cta::after {
    animation: none;
  }

  .showcase-panel:hover {
    transform: none;
  }

  .showcase-panel:hover .showcase-panel__tags li {
    transform: none;
  }
}

@media (max-width: 900px) {
  .showcase-split::before {
    display: none;
  }
}

@media (max-width: 900px) {
  .section--showcase {
    padding: 0;
  }

  .section--cases {
    min-height: auto;
    padding: 72px 0;
    display: block;
  }

  .section--cases .container,
  .section--cases .cases-panels,
  .section--cases .case-panel {
    display: block;
    flex: none;
  }

  .showcase-split {
    grid-template-columns: 1fr;
    grid-template-rows: none;
    gap: 20px;
    padding: 24px;
    min-height: auto;
  }

  .showcase-panel {
    grid-row: auto;
    grid-template-rows: 44px 88px auto;
    display: grid;
    padding: 28px 24px 32px;
  }

  .showcase-panel__foot {
    min-height: auto;
    height: auto;
  }

  .showcase-panel--ttd {
    border-right: none;
  }

  .showcase-panel--banbai {
    margin: 0;
    height: auto;
  }
}

@media (max-width: 480px) {
  .showcase-panel {
    padding: 24px 20px 28px;
  }

  .showcase-panel__top {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    height: auto;
    min-height: 44px;
  }

  .showcase-panel__logo {
    height: 80px;
    min-height: 80px;
  }

  .showcase-panel__logo img {
    width: 80px;
    height: 80px;
  }
}

/* ── Products · 业务与服务 ── */
.section--offerings {
  padding: 88px 0 96px;
  background: var(--bg);
  border-top: 1px solid var(--line);
}

.offerings-head {
  max-width: 560px;
  margin-bottom: 40px;
}

.offerings-head h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.offerings-head__lead {
  font-size: 15px;
  line-height: 1.8;
  color: var(--fg-muted);
}

.offerings-guide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 32px;
}

.offerings-guide__item {
  padding: 20px 22px;
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.offerings-guide__item strong {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.offerings-guide__item span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--fg-muted);
}

.offerings-guide__item em {
  font-style: normal;
  font-weight: 600;
  color: var(--fg);
}

.offerings-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.offerings-tabs__btn {
  flex: 0 1 auto;
  min-width: 200px;
  padding: 18px 36px;
  font-family: var(--font);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg-muted);
  background: var(--bg);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: color var(--ease), background var(--ease), border-color var(--ease), transform var(--ease);
}

.offerings-tabs__btn sup {
  font-size: 0.65em;
  font-weight: 600;
}

.offerings-tabs__btn.is-active {
  color: var(--white);
  background: var(--black);
  border-color: var(--black);
}

.offerings-tabs__btn:hover:not(.is-active) {
  color: var(--fg);
  border-color: var(--fg);
}

.offerings-panel {
  display: none;
}

.offerings-panel.is-active {
  display: block;
}

.offerings-panel__head {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.offerings-panel__head h3 {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}

.offerings-panel__head h3 sup {
  font-size: 0.55em;
  font-weight: 600;
  vertical-align: super;
}

.offerings-panel__head p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--fg-muted);
  max-width: 52em;
  margin-bottom: 16px;
}

.offerings-panel__link {
  display: inline-flex;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding-bottom: 2px;
  border-bottom: 2px solid var(--fg);
  transition: opacity var(--ease);
}

.offerings-panel__link:hover {
  opacity: 0.6;
}

.offerings-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: offerings-step;
}

.offerings-step {
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.offerings-step:first-child {
  padding-top: 0;
}

.offerings-step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.offerings-step--highlight {
  margin-top: 8px;
  padding: 28px 24px;
  border: 2px solid var(--black);
  border-bottom: 2px solid var(--black) !important;
}

.offerings-step__label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 10px;
}

.offerings-step--highlight .offerings-step__label {
  color: var(--fg);
}

.offerings-step h4 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.offerings-step__desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--fg-muted);
  max-width: 48em;
  margin-bottom: 20px;
}

.offerings-step__note {
  font-size: 13px;
  line-height: 1.65;
  color: var(--fg-muted);
  margin-top: 12px;
}

.offerings-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.offerings-table thead {
  border-bottom: 1px solid var(--line);
}

.offerings-table th {
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  padding: 0 16px 10px 0;
}

.offerings-table th:nth-child(3) {
  width: 120px;
  text-align: right;
  padding-right: 0;
}

.offerings-table th:last-child:not(.offerings-table__cart-head) {
  width: 120px;
  text-align: right;
  padding-right: 0;
}

.offerings-table__cart-head {
  width: 72px !important;
  text-align: center !important;
  padding-right: 0 !important;
}

.offerings-table__cart-cell {
  text-align: center !important;
  padding-right: 0 !important;
  white-space: nowrap;
  font-weight: 400 !important;
}

.offerings-cart-add {
  appearance: none;
  border: 1px solid var(--black);
  background: var(--black);
  color: var(--white);
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 6px 12px;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), transform 0.2s ease;
}

.offerings-cart-add:hover {
  background: var(--white);
  color: var(--black);
}

.offerings-cart-add:active {
  transform: scale(0.96);
}

.offerings-table td {
  padding: 14px 16px 14px 0;
  vertical-align: top;
  line-height: 1.55;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.offerings-table td:first-child {
  font-weight: 600;
  white-space: nowrap;
}

.offerings-table td:nth-child(3) {
  text-align: right;
  font-weight: 600;
  white-space: nowrap;
  padding-right: 0;
}

.offerings-table td:last-child:not(.offerings-table__cart-cell) {
  text-align: right;
  font-weight: 600;
  white-space: nowrap;
  padding-right: 0;
}

.offerings-table tbody tr:last-child td {
  border-bottom: none;
}

.offerings-foot {
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-muted);
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

/* ── 在线意向单 / 购物车 ── */
body.order-cart-open {
  overflow: hidden;
}

.order-cart-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 18px 0 14px;
  height: 48px;
  border: 1px solid var(--black);
  background: var(--black);
  color: var(--white);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.order-cart-fab:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28);
}

.order-cart-fab__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  font-size: 11px;
}

.order-cart-fab__badge {
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--white);
  color: var(--black);
  font-size: 11px;
  font-weight: 700;
  line-height: 20px;
  text-align: center;
}

.order-cart-fab.is-empty .order-cart-fab__badge {
  opacity: 0.45;
}

.order-cart {
  position: fixed;
  inset: 0;
  z-index: 950;
  pointer-events: none;
}

.order-cart.is-open {
  pointer-events: auto;
}

.order-cart__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  transition: opacity 0.32s ease;
}

.order-cart.is-open .order-cart__backdrop {
  opacity: 1;
}

.order-cart__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(420px, 100vw);
  height: 100%;
  background: var(--bg);
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.36s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: -20px 0 60px rgba(0, 0, 0, 0.12);
}

.order-cart.is-open .order-cart__panel {
  transform: translateX(0);
}

.order-cart__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--line);
}

.order-cart__head h2 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.order-cart__close {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--fg);
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
}

.order-cart__body {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px 28px;
  display: flex;
  flex-direction: column;
}

.order-cart.is-checkout .order-cart__step--checkout { order: 1; }
.order-cart.is-checkout .order-cart__list-title { order: 2; }
.order-cart.is-checkout .order-cart__list { order: 3; }
.order-cart.is-checkout .order-cart__totals { order: 4; }

.order-cart__list-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  margin: 16px 0 8px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.order-cart__empty {
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-muted);
  padding: 12px 0 20px;
}

.order-cart__list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.order-cart__item {
  display: flex;
  gap: 12px;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.order-cart__item-product {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 4px;
}

.order-cart__item-index {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.order-cart__item-meta {
  font-size: 12px;
  color: var(--fg-muted);
  margin-top: 6px;
  line-height: 1.5;
}

.order-cart__step {
  margin-top: 4px;
}

.order-cart__step-hint {
  font-size: 12px;
  line-height: 1.65;
  color: var(--fg-muted);
  margin-bottom: 12px;
}

.order-cart__checkout {
  width: 100%;
}

.order-cart__form-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.order-cart__back {
  align-self: flex-start;
}

.order-cart__item-name {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
}

.order-cart__item-step {
  font-size: 12px;
  color: var(--fg-muted);
  margin-top: 4px;
  line-height: 1.5;
}

.order-cart__item-price {
  font-size: 14px;
  font-weight: 600;
  margin-top: 8px;
}

.order-cart__from {
  font-size: 11px;
  font-weight: 500;
  color: var(--fg-muted);
}

.order-cart__item-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  flex-shrink: 0;
}

.order-cart__qty {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
}

.order-cart__qty-btn {
  appearance: none;
  border: none;
  background: transparent;
  width: 28px;
  height: 28px;
  font-size: 16px;
  cursor: pointer;
  color: var(--fg);
}

.order-cart__qty-num {
  min-width: 24px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
}

.order-cart__remove {
  appearance: none;
  border: none;
  background: none;
  color: var(--fg-muted);
  font-size: 12px;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.order-cart__totals {
  padding: 14px 0 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}

.order-cart__total-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
}

.order-cart__total-row strong {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.order-cart__quote-note {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--fg-muted);
}

.order-cart__form-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
}

.order-cart__field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
  font-size: 13px;
}

.order-cart__field span {
  color: var(--fg-muted);
  font-weight: 500;
}

.order-cart__field input,
.order-cart__field textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--fg);
  font-family: inherit;
  font-size: 14px;
  padding: 10px 12px;
  transition: border-color var(--ease);
}

.order-cart__field input:focus,
.order-cart__field textarea:focus {
  outline: none;
  border-color: var(--black);
}

.order-cart__field--file input {
  padding: 8px 0;
  border: none;
  font-size: 13px;
}

.order-cart__hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.order-cart__turnstile {
  min-height: 65px;
  margin: 0.25rem 0 0.75rem;
}

.order-cart__submit {
  width: 100%;
  margin-top: 4px;
}

.order-cart__disclaimer {
  margin-top: 12px;
  font-size: 11px;
  line-height: 1.65;
  color: var(--fg-muted);
}

.offerings-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.offerings-reveal.is-visible {
  opacity: 1;
  transform: none;
}

.offerings-steps .offerings-step.offerings-reveal:nth-child(1) { transition-delay: 0.04s; }
.offerings-steps .offerings-step.offerings-reveal:nth-child(2) { transition-delay: 0.08s; }
.offerings-steps .offerings-step.offerings-reveal:nth-child(3) { transition-delay: 0.12s; }
.offerings-steps .offerings-step.offerings-reveal:nth-child(4) { transition-delay: 0.16s; }

@media (max-width: 900px) {
  .section--offerings {
    padding: 64px 0 80px;
  }

  .offerings-guide {
    grid-template-columns: 1fr;
  }

  .offerings-tabs {
    flex-wrap: wrap;
  }

  .offerings-tabs__btn {
    min-width: 160px;
    flex: 1 1 140px;
    padding: 16px 24px;
    font-size: 15px;
  }

  .offerings-table th:last-child,
  .offerings-table td:nth-child(3) {
    width: 88px;
  }

  .offerings-table__cart-head,
  .offerings-table__cart-cell {
    width: auto !important;
  }
}

@media (max-width: 600px) {
  .offerings-table {
    display: block;
  }

  .offerings-table thead {
    display: none;
  }

  .offerings-table tbody,
  .offerings-table tr,
  .offerings-table td {
    display: block;
    width: 100%;
  }

  .offerings-table tr {
    padding: 14px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  }

  .offerings-table tr:last-child {
    border-bottom: none;
  }

  .offerings-table td {
    padding: 2px 0;
    border: none;
    text-align: left !important;
  }

  .offerings-table td:first-child {
    font-size: 15px;
    margin-bottom: 4px;
  }

  .offerings-table td:nth-child(3) {
    font-size: 13px;
    color: var(--fg-muted);
  }

  .offerings-table td:nth-child(3)::before {
    content: "参考价 ";
    font-weight: 400;
  }

  .offerings-table td:last-child {
    margin-top: 10px;
    text-align: left !important;
  }

  .offerings-table td:last-child::before {
    content: none;
  }

  .offerings-cart-add {
    width: 100%;
    padding: 10px 12px;
  }

  .order-cart-fab {
    right: 16px;
    bottom: 16px;
    height: 44px;
    padding: 0 14px 0 12px;
  }
}

@media (max-width: 480px) {
  .section--offerings {
    padding: 48px 0 64px;
  }

  .offerings-step--highlight {
    padding: 20px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .offerings-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ── Contact ── */
.section--contact {
  padding-top: 96px;
  padding-bottom: 96px;
  background: var(--bg);
}

.contact-header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.contact-header h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.contact-header__desc {
  margin-top: 12px;
  font-size: 15px;
  color: var(--fg-muted);
  max-width: 32em;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr min(360px, 34%);
  gap: 32px 48px;
  align-items: stretch;
}

.contact-channels {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  align-content: start;
}

.contact-channel {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 32px 28px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: inherit;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: border-color var(--ease);
}

.contact-channel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--black);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--ease);
}

.contact-channel:hover {
  border-color: var(--black);
}

.contact-channel:hover::before {
  transform: scaleX(1);
}

.contact-channel--static {
  cursor: default;
}

.contact-channel--static:hover {
  border-color: var(--line);
}

.contact-channel--static:hover::before {
  transform: scaleX(0);
}

.contact-channel__num {
  flex-shrink: 0;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
  color: rgba(0, 0, 0, 0.08);
}

.contact-channel__body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.contact-channel__label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
}

.contact-channel__value {
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  word-break: break-all;
}

.contact-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px 36px;
  background: var(--black);
  color: var(--white);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 14px),
    calc(100% - 14px) 100%,
    0 100%
  );
}

.contact-panel__logo {
  opacity: 0.88;
  margin-bottom: 24px;
  filter: invert(1);
}

.contact-panel__lead {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
  margin-bottom: 10px;
}

.contact-panel__sub {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.62);
  margin-bottom: 28px;
}

.contact-panel .btn {
  align-self: flex-start;
}

@media (max-width: 900px) {
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .contact-channels {
    grid-template-columns: 1fr;
  }

  .section--contact {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}

.page-contact__body.section--contact {
  padding-top: 64px;
}

/* ── Footer · 纯黑，与产品区左栏同色衔接 ── */
.footer {
  padding: 28px 0;
  background: #000000;
  color: var(--white);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
}

.footer__brand img {
  filter: invert(1);
}

.footer__copy {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--ease);
}

.footer__links a:hover { color: var(--white); }

/* ── Responsive ── */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .header__actions { display: none; }

  .menu-toggle { display: flex; }

  .hero__inner {
    padding: 72px 24px 88px;
  }

  .section { padding: 64px 0; }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ── 子页面 Hero · 关于 ── */
.subpage-hero {
  padding: 96px 0 48px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.subpage-hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 12px 0 16px;
}

.subpage-hero__sub {
  font-size: 17px;
  line-height: 1.75;
  color: var(--fg-muted);
  max-width: 36em;
}

.page-about {
  background: var(--bg);
}

.page-contact {
  background: var(--bg);
}

.subpage-hero--about,
.subpage-hero--contact {
  position: relative;
  min-height: min(52vh, 460px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 0;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.subpage-hero--contact {
  min-height: min(42vh, 360px);
}

.subpage-hero--about .subpage-hero__grid,
.subpage-hero--contact .subpage-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black 25%, transparent 92%);
  pointer-events: none;
}

.subpage-hero--about .subpage-hero__slant,
.subpage-hero--contact .subpage-hero__slant {
  position: absolute;
  top: -12%;
  right: -5%;
  width: 42%;
  height: 125%;
  background: var(--black);
  transform: skewX(-16deg);
  opacity: 0.04;
  pointer-events: none;
}

.subpage-hero__inner {
  position: relative;
  z-index: 1;
}

.subpage-hero--about .subpage-hero__inner,
.subpage-hero--contact .subpage-hero__inner {
  text-align: center;
}

.subpage-hero__eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--fg-muted);
  margin-bottom: 18px;
}

.subpage-hero__eyebrow span {
  color: var(--fg);
  margin-right: 10px;
}

.subpage-hero--about h1,
.subpage-hero--contact h1 {
  font-size: clamp(36px, 5.5vw, 52px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.08;
  margin: 0 auto 20px;
  max-width: 12em;
}

.subpage-hero--about .subpage-hero__sub,
.subpage-hero--contact .subpage-hero__sub {
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.8;
  color: var(--fg-muted);
  max-width: 28em;
  margin: 0 auto;
}

.section--about-page {
  padding: 80px 0 96px;
  border-bottom: none;
}

.section--about-page > .container {
  max-width: 960px;
}

.about-layout--page {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 48px;
  max-width: 680px;
  margin: 0 auto;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.about-story {
  min-width: 0;
  width: 100%;
}

.page-about .about-story__lead {
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: -0.025em;
  margin-bottom: 28px;
  padding-left: 0;
  border-left: none;
}

.page-about .about-story__text {
  font-size: 15px;
  line-height: 1.95;
  max-width: 36em;
  margin-left: auto;
  margin-right: auto;
}

.page-about .about-aside {
  position: static;
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
}

.page-about .about-quote {
  width: 100%;
  padding: 40px 36px;
  text-align: left;
}

.page-about .about-quote p {
  font-size: 16px;
  line-height: 1.9;
}

.about-block {
  margin-top: 72px;
}

.about-block__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  margin-bottom: 28px;
  text-align: center;
}

.about-block__label span {
  color: var(--fg);
  margin-right: 10px;
}

.about-grid--page {
  gap: 20px;
}

.about-hero__mark {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(420px, 55vw);
  height: auto;
  z-index: 0;
  pointer-events: none;
  opacity: 0.12;
  transform: translate(-50%, -50%);
  animation: aboutHeroMark 14s ease-in-out infinite alternate;
}

@keyframes aboutHeroMark {
  from { transform: translate(-50%, -50%) scale(1); }
  to { transform: translate(calc(-50% + 12px), calc(-50% - 8px)) scale(1.04); }
}

.about-hero-in {
  animation: aboutHeroIn 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.about-hero-in--2 { animation-delay: 0.12s; }
.about-hero-in--3 { animation-delay: 0.24s; }

@keyframes aboutHeroIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.about-band {
  position: relative;
  height: min(42vh, 320px);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.about-band__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  transform: scale(1.06);
  animation: aboutBandKen 18s ease-in-out infinite alternate;
}

@keyframes aboutBandKen {
  from { transform: scale(1.06); }
  to { transform: scale(1.12); }
}

.about-band__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.88));
  pointer-events: none;
}

.about-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.75s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.75s cubic-bezier(0.22, 1, 0.36, 1);
}

.about-reveal.is-visible {
  opacity: 1;
  transform: none;
}

.about-grid--visual .about-reveal:nth-child(1) { transition-delay: 0.04s; }
.about-grid--visual .about-reveal:nth-child(2) { transition-delay: 0.12s; }
.about-grid--visual .about-reveal:nth-child(3) { transition-delay: 0.2s; }

.about-points--page .about-reveal:nth-child(1) { transition-delay: 0.04s; }
.about-points--page .about-reveal:nth-child(2) { transition-delay: 0.1s; }
.about-points--page .about-reveal:nth-child(3) { transition-delay: 0.16s; }
.about-points--page .about-reveal:nth-child(4) { transition-delay: 0.22s; }

.page-about .about-card--visual {
  min-height: 0;
  padding: 0;
  overflow: hidden;
}

.page-about .about-card__visual {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: #0a0a0a;
  position: relative;
}

.page-about .about-card--visual:nth-child(2) .about-card__visual {
  background: #f5f5f5;
}

.page-about .about-card__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.35) 0%, transparent 55%);
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.page-about .about-card--visual:nth-child(2) .about-card__visual::after {
  background: linear-gradient(to top, rgba(0, 0, 0, 0.15) 0%, transparent 55%);
}

.page-about .about-card--visual:hover .about-card__visual::after {
  opacity: 0.85;
}

.page-about .about-card__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about .about-card--visual:hover .about-card__visual img {
  transform: scale(1.05);
}

.page-about .about-card__body {
  padding: 24px 24px 28px;
  text-align: center;
}

.page-about .about-card--visual h3 {
  font-size: 17px;
  margin-bottom: 8px;
  padding-right: 0;
}

.page-about .about-card--visual p {
  font-size: 14px;
  line-height: 1.65;
  margin-top: 0;
}

.page-about .about-card {
  min-height: 228px;
  display: flex;
  flex-direction: column;
  padding: 36px 28px 32px;
  transition:
    border-color var(--ease),
    transform var(--ease),
    box-shadow var(--ease);
}

.page-about .about-card:hover {
  border-color: var(--black);
  transform: translateY(-2px);
  box-shadow: 6px 6px 0 var(--black);
}

.page-about .about-card__num {
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 52px;
  margin-bottom: 0;
}

.page-about .about-card h3 {
  font-size: 18px;
  margin-bottom: 14px;
  padding-right: 40px;
}

.page-about .about-card p {
  font-size: 14px;
  line-height: 1.8;
  margin-top: auto;
}

.about-points--page {
  grid-template-columns: repeat(2, 1fr);
  margin-top: 0;
  gap: 16px;
  background: transparent;
  border: none;
}

.about-points--page li {
  padding: 22px 24px 22px 40px;
  border: 1px solid var(--line);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  position: relative;
  text-align: center;
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}

.about-points--page li::before {
  display: none;
}

.about-points--page li:hover {
  border-color: var(--black);
  background: rgba(0, 0, 0, 0.02);
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  .about-hero__mark,
  .about-band__img,
  .about-hero-in {
    animation: none;
  }

  .about-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-card--visual:hover .about-card__visual img {
    transform: none;
  }
}

.about-page__cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid var(--line);
}

@media (max-width: 900px) {
  .about-layout--page {
    gap: 36px;
    padding-bottom: 56px;
  }

  .about-block {
    margin-top: 56px;
  }

  .about-points--page {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

@media (max-width: 768px) {
  .subpage-hero--about,
  .subpage-hero--contact {
    min-height: auto;
    padding: 32px 0 48px;
  }

  .about-band {
    height: min(36vh, 220px);
  }

  .section--about-page {
    padding: 56px 0 72px;
  }

  .about-page__cta {
    flex-direction: column;
    align-items: stretch;
  }

  .about-page__cta .btn {
    width: 100%;
  }
}

/* ── 行业案例 · 独立页面（官方大气版） ── */
.page-cases {
  background: #000000;
}

.page-cases .cases-main,
.page-cases .footer {
  color: var(--white);
}

.cases-main {
  overflow-x: hidden;
}

/* Hero */
.cases-hero {
  position: relative;
  min-height: min(72vh, 720px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.cases-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), transparent 85%);
  pointer-events: none;
}

.cases-hero__slant {
  position: absolute;
  top: -10%;
  right: -8%;
  width: 50%;
  height: 120%;
  background: rgba(255, 255, 255, 0.03);
  transform: skewX(-16deg);
  pointer-events: none;
}

.cases-hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.cases-hero__eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 20px;
}

.cases-hero__eyebrow span {
  margin-right: 12px;
  color: rgba(255, 255, 255, 0.7);
}

.cases-hero__title {
  font-size: clamp(40px, 6.5vw, 72px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin: 0 auto 24px;
  max-width: 12em;
}

.cases-hero__lead {
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.58);
  max-width: 32em;
  margin: 0 auto;
}

/* Shell & Nav */
.cases-shell {
  position: relative;
}

.cases-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 40;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.cases-nav__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 28px 32px;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.45);
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 2px solid transparent;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}

.cases-nav__item:last-child {
  border-right: none;
}

.cases-nav__item:hover {
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.03);
}

.cases-nav__item.is-active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.04);
  border-bottom-color: var(--white);
}

.cases-nav__index {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  opacity: 0.6;
}

.cases-nav__label {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* Panel */
.cases-panel[hidden] {
  display: none;
}

.cases-panel.is-active {
  animation: casesPanelIn 0.65s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes casesPanelIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.cases-panel__banner {
  position: relative;
  min-height: min(62vh, 580px);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: #000000;
}

.cases-panel__banner-visual {
  position: absolute;
  inset: 0;
}

.cases-panel__banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  background: #0a0a0a;
  transform: scale(1.06);
  animation: casesKenBurns 18s ease-in-out infinite alternate;
}

@keyframes casesKenBurns {
  from { transform: scale(1.06) translateX(0); }
  to   { transform: scale(1.12) translateX(-1.5%); }
}

.cases-panel__banner-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(0, 0, 0, 0.92) 0%, rgba(0, 0, 0, 0.35) 45%, rgba(0, 0, 0, 0.15) 100%),
    linear-gradient(to right, rgba(0, 0, 0, 0.55) 0%, transparent 55%);
  pointer-events: none;
}

.cases-panel__banner--education .cases-panel__banner-shade {
  box-shadow: inset 0 0 120px rgba(61, 90, 254, 0.12);
}

.cases-panel__banner--manufacturing .cases-panel__banner-shade {
  box-shadow: inset 0 0 120px rgba(245, 158, 11, 0.1);
}

.cases-panel__banner--logistics .cases-panel__banner-shade {
  box-shadow: inset 0 0 120px rgba(34, 197, 94, 0.1);
}

.cases-panel__banner--retail .cases-panel__banner-shade {
  box-shadow: inset 0 0 120px rgba(236, 72, 153, 0.1);
}

.cases-panel__banner-inner {
  position: relative;
  z-index: 1;
  padding: 64px 24px 72px;
}

.cases-panel__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 16px;
}

.cases-panel__banner-inner h2 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 16px;
}

.cases-panel__banner-inner p {
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.65);
  max-width: 36em;
}

/* Stats strip */
.cases-panel__stats {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
}

.cases-panel__stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.cases-stat {
  padding: 48px 24px;
  text-align: center;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.cases-stat:last-child {
  border-right: none;
}

.cases-stat__num {
  display: block;
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 12px;
}

.cases-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.48);
  letter-spacing: 0.02em;
}

/* Solution rows */
.cases-panel__body {
  padding: 80px 24px 96px;
}

.cases-solution {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 0;
  min-height: 460px;
  margin-bottom: 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.025);
  transition: border-color 0.4s ease, transform 0.4s ease;
}

.cases-solution:hover {
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.cases-solution--reverse {
  direction: rtl;
}

.cases-solution--reverse > * {
  direction: ltr;
}

.cases-solution__visual {
  min-height: 360px;
  background: #0a0a0a;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  position: relative;
  overflow: hidden;
}

.cases-solution--reverse .cases-solution__visual {
  border-right: none;
  border-left: 1px solid rgba(255, 255, 255, 0.06);
}

.cases-solution__img {
  width: 100%;
  height: 100%;
  min-height: 360px;
  object-fit: cover;
  object-position: center;
  background: #0a0a0a;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.cases-solution:hover .cases-solution__img {
  transform: scale(1.04);
}

.cases-solution__visual-shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.55) 0%, transparent 50%);
  pointer-events: none;
}

.cases-solution__visual::after {
  content: "";
  position: absolute;
  inset: 20px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  pointer-events: none;
  transition: inset 0.4s ease;
}

.cases-solution:hover .cases-solution__visual::after {
  inset: 14px;
}

.cases-solution__content {
  padding: 56px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.cases-solution__num {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.35);
  margin-bottom: 20px;
}

.cases-solution__content h3 {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.cases-solution__content p {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.58);
  margin-bottom: 28px;
  max-width: 28em;
}

.cases-solution__points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.cases-solution__points li {
  padding: 14px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-left: 20px;
  position: relative;
}

.cases-solution__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--white);
  transform: translateY(-50%);
  clip-path: polygon(0 50%, 100% 0, 100% 100%);
}

.cases-panel__foot {
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.cases-panel__foot .btn--lg {
  min-width: 220px;
  padding-left: 36px;
  padding-right: 36px;
}

/* Scroll reveal & motion */
.cases-reveal {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity 0.85s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.85s cubic-bezier(0.22, 1, 0.36, 1);
}

.cases-reveal.is-visible {
  opacity: 1;
  transform: none;
}

.cases-panel__stats-grid .cases-reveal:nth-child(1) { transition-delay: 0.04s; }
.cases-panel__stats-grid .cases-reveal:nth-child(2) { transition-delay: 0.1s; }
.cases-panel__stats-grid .cases-reveal:nth-child(3) { transition-delay: 0.16s; }
.cases-panel__stats-grid .cases-reveal:nth-child(4) { transition-delay: 0.22s; }

.cases-hero__title {
  animation: casesHeroIn 1.1s cubic-bezier(0.22, 1, 0.36, 1) 0.15s both;
}

.cases-hero__lead {
  animation: casesHeroIn 1s cubic-bezier(0.22, 1, 0.36, 1) 0.35s both;
}

.cases-hero__eyebrow {
  animation: casesHeroIn 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.05s both;
}

@keyframes casesHeroIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.cases-nav__item {
  transition: color var(--ease), background var(--ease), border-color var(--ease), transform 0.25s ease;
}

.cases-nav__item.is-active {
  transform: translateY(-1px);
}

@media (prefers-reduced-motion: reduce) {
  .cases-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .cases-panel.is-active,
  .cases-hero__title,
  .cases-hero__lead,
  .cases-hero__eyebrow,
  .cases-panel__banner-img {
    animation: none;
    transform: none;
  }

  .cases-solution:hover .cases-solution__img,
  .cases-solution:hover {
    transform: none;
  }
}

@media (max-width: 1024px) {
  .cases-nav__item {
    padding: 22px 20px;
  }

  .cases-nav__label {
    font-size: 14px;
  }

  .cases-solution {
    grid-template-columns: 1fr;
  }

  .cases-solution--reverse {
    direction: ltr;
  }

  .cases-solution__visual {
    min-height: 280px;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .cases-solution__img {
    min-height: 280px;
  }

  .cases-solution--reverse .cases-solution__visual {
    border-left: none;
  }

  .cases-solution__content {
    padding: 40px 32px;
  }
}

@media (max-width: 768px) {
  .cases-hero {
    min-height: auto;
    padding: 100px 0 56px;
  }

  .cases-nav {
    grid-template-columns: repeat(2, 1fr);
    top: var(--header-h);
  }

  .cases-nav__item:nth-child(2) {
    border-right: none;
  }

  .cases-nav__item:nth-child(1),
  .cases-nav__item:nth-child(2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .cases-panel__stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cases-stat:nth-child(2) {
    border-right: none;
  }

  .cases-stat:nth-child(1),
  .cases-stat:nth-child(2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .cases-panel__body {
    padding: 48px 24px 64px;
  }

  .cases-panel__banner-inner {
    padding: 48px 24px 56px;
  }
}

@media (max-width: 480px) {
  .cases-nav {
    grid-template-columns: 1fr;
  }

  .cases-nav__item {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .cases-nav__item:last-child {
    border-bottom: none;
  }

  .cases-panel__stats-grid {
    grid-template-columns: 1fr;
  }

  .cases-stat {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .cases-stat:last-child {
    border-bottom: none;
  }

  .cases-solution__content {
    padding: 32px 24px;
  }
}