/* ═══════════════════════════════════════════
   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;
}

*, *::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;
}

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

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

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

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

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--black);
}

.header__inner {
  display: flex;
  align-items: center;
  height: 68px;
  gap: 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  overflow: visible;
}

.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;
}

.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;
}

.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(--bg);
}

.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--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 {
    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 {
  scroll-margin-top: 68px;
}

/* ── 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-top: 88px;
  padding-bottom: 88px;
}

.section--cases .section-head {
  margin-bottom: 36px;
}

.cases-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.cases-tab {
  appearance: none;
  font: inherit;
  cursor: pointer;
  padding: 16px 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: 32px 28px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
}

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

.case-panel__head {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.case-panel__num {
  flex-shrink: 0;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
  color: rgba(255, 255, 255, 0.12);
}

.case-panel__head h3 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.case-panel__lead {
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-light);
  max-width: 42em;
}

.case-panel__points {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 0 0 24px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.case-panel__points li {
  padding: 18px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.78);
  background: rgba(0, 0, 0, 0.35);
}

@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: 68px 0 0;
  min-height: auto;
  background: #000000;
  border-bottom: none;
}

.showcase-screen {
  display: flex;
  flex-direction: column;
}

.showcase-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: min(680px, calc(100svh - 68px));
}

.showcase-panel {
  display: grid;
  grid-template-rows: auto 176px auto;
  align-content: stretch;
  padding: 32px 36px 36px;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}

.showcase-panel--ttd {
  background: #000000;
  color: #ffffff;
}

.showcase-panel--banbai {
  background: #ffffff;
  color: #000000;
  border-left: 1px solid rgba(255, 255, 255, 0.12);
}

.showcase-panel--banbai::after {
  content: "";
  position: absolute;
  inset: 0;
  background: #000000;
  opacity: 0;
  transition: opacity var(--ease);
  pointer-events: none;
}

.showcase-panel--banbai:hover::after {
  opacity: 0.03;
}

.showcase-panel__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  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: 176px;
  padding: 8px 12px;
  position: relative;
  z-index: 1;
  background: transparent;
}

.showcase-panel--ttd .showcase-panel__logo {
  background: #000000;
}

.showcase-panel--banbai .showcase-panel__logo {
  background: #ffffff;
}

.showcase-panel__logo img {
  display: block;
  width: 152px;
  height: 152px;
  object-fit: contain;
  flex-shrink: 0;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.showcase-panel:hover .showcase-panel__logo img {
  transform: scale(1.04);
}

.showcase-panel__foot {
  position: relative;
  z-index: 1;
  align-self: end;
  padding-top: 20px;
}

.showcase-panel__foot h3 {
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}

.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-bottom: 16px;
}

.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-bottom: 24px;
}

.showcase-panel__tags li {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border: 1px solid currentColor;
}

.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;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding-bottom: 2px;
  border-bottom: 2px solid currentColor;
  transition: gap var(--ease);
}

.showcase-panel:hover .showcase-panel__cta {
  gap: 14px;
}

.showcase-panel__cta::after {
  content: "→";
}

@media (max-width: 900px) {
  .section--showcase {
    padding-top: 60px;
  }

  .showcase-split {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .showcase-panel {
    grid-template-rows: auto 160px auto;
    min-height: auto;
  }

  .showcase-panel--banbai {
    border-left: none;
    border-top: 1px solid var(--line);
  }

  .showcase-panel {
    padding: 28px 24px 32px;
  }
}

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

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

  .showcase-panel__logo {
    height: 140px;
  }

  .showcase-panel__logo img {
    width: 128px;
    height: 128px;
  }
}

/* ── 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__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;
  }
}

/* ── Footer · 纯黑 ── */
.footer {
  padding: 28px 0;
  background: var(--black);
  color: var(--white);
  border-top: none;
}

.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;
  }
}