/* ==========================================================================
   元数点AI 官方站
   风格：优雅、大气、科技艺术感、清新活泼
   母题：点阵/粒子（「元数点」品牌意象）
   ========================================================================== */

/* --------------------------------------------------------------------------
   设计 Token（品牌色继承自 work 站，但艺术指导更宏大）
   -------------------------------------------------------------------------- */
:root {
  /* 品牌色 —— 青到紫光谱（work 站同款） */
  --c-blue:       #1FB8C9;    /* 品牌青 */
  --c-blue-600:   #189BA9;
  --c-blue-50:    #EAF7FA;

  --c-violet:     #7E4FD0;    /* 极光紫 */
  --c-violet-600: #6B3FB8;
  --c-violet-50:  #F2EAFA;

  --c-indigo:     #4D6BB7;    /* 中间蓝 */
  --c-indigo-600: #3F5BA0;
  --c-indigo-50:  #EBF0F9;

  /* 渐变 —— 品牌主渐变 */
  --grad:         linear-gradient(135deg, #1FB8C9 0%, #4D6BB7 50%, #7E4FD0 100%);
  --grad-soft:    linear-gradient(135deg, rgba(31,184,201,0.08) 0%, rgba(126,79,208,0.08) 100%);
  --grad-glow:    radial-gradient(circle at 50% 50%, rgba(31,184,201,0.2), rgba(77,107,183,0.15), transparent 70%);

  /* 中性色 —— 深色模式优先，白底为 paper */
  --c-ink:        #0B0E14;    /* 深墨（背景） */
  --c-ink-soft:   #0F1729;
  --c-ink-2:      #1E293B;
  --c-ink-3:      #334155;
  --c-ink-4:      #475569;
  --c-ink-5:      #64748B;

  --c-paper:      #FFFFFF;
  --c-paper-soft: #FAFBFD;
  --c-paper-warm: #F6F8FB;
  --c-paper-2:    #EEF1F6;

  --c-line:       rgba(148,163,184,0.12);
  --c-line-soft:  rgba(148,163,184,0.06);

  /* 语义色 */
  --c-ok:    #10B981;
  --c-warn:  #F59E0B;
  --c-err:   #EF4444;

  /* 字体 */
  --f-sans:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --f-display: "Noto Serif SC", Georgia, "Songti SC", serif;
  --f-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Consolas, monospace;

  /* 尺度 */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-pill: 999px;

  /* 投影（微妙精致） */
  --sh-1: 0 1px 3px rgba(11,14,20,.04), 0 1px 2px rgba(11,14,20,.03);
  --sh-2: 0 4px 16px rgba(11,14,20,.06), 0 2px 4px rgba(11,14,20,.04);
  --sh-3: 0 12px 40px rgba(11,14,20,.09), 0 4px 8px rgba(11,14,20,.05);
  --sh-4: 0 32px 80px rgba(11,14,20,.12), 0 8px 16px rgba(11,14,20,.06);
  --sh-glow: 0 0 80px rgba(31,184,201,.3), 0 0 40px rgba(77,107,183,.2);

  /* 布局 */
  --container: 1240px;
  --gutter: 32px;
  --section-y: 140px;
  --nav-h: 72px;

  /* 动效 */
  --ease:     cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-elastic: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --section-y: 80px;
    --nav-h: 64px;
  }
}

/* --------------------------------------------------------------------------
   重置 + 基础
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--f-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--c-ink);
  background: var(--c-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
ol, ul { list-style: none; }
::selection { background: var(--c-blue-50); color: var(--c-ink); }

/* --------------------------------------------------------------------------
   工具类
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  position: relative;
  padding: var(--section-y) 0;
}
.section--paper { background: var(--c-paper); }
.section--soft { background: var(--c-paper-warm); }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% 200%;
  animation: gradShift 8s ease-in-out infinite;
}
@keyframes gradShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* Reveal 动画（滚动触发，通过 JS） */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   顶栏
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-line-soft);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.nav.scrolled {
  background: rgba(255,255,255,0.98);
  border-bottom-color: var(--c-line);
  box-shadow: var(--sh-1);
}
.nav__inner {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  gap: 32px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1.125rem;
  transition: opacity 0.25s ease;
}
.nav__brand:hover { opacity: 0.7; }
.nav__logo {
  width: 40px;
  height: 40px;
}
.nav__name em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-left: auto;
}
.nav__links a {
  font-size: 0.9375rem;
  color: var(--c-ink-4);
  font-weight: 500;
  transition: color 0.25s ease;
  position: relative;
}
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad);
  transform: scaleX(0);
  transition: transform 0.3s var(--ease-out);
}
.nav__links a:hover {
  color: var(--c-ink);
}
.nav__links a:hover::after {
  transform: scaleX(1);
}
.nav__cta {
  margin-left: 16px;
}
.nav__burger, .nav__drawer {
  display: none;
}

@media (max-width: 960px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    margin-left: auto;
  }
  .nav__burger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--c-ink-3);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.25s ease;
  }
  .nav__burger[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav__burger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }
  .nav__burger[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  .nav__drawer {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-paper);
    border-bottom: 1px solid var(--c-line);
    box-shadow: var(--sh-2);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-out);
  }
  .nav__drawer.open {
    max-height: 300px;
  }
  .nav__drawer a {
    display: block;
    padding: 16px var(--gutter);
    font-weight: 500;
    color: var(--c-ink-4);
    border-bottom: 1px solid var(--c-line-soft);
    transition: background 0.2s ease, color 0.2s ease;
  }
  .nav__drawer a:hover {
    background: var(--c-paper-warm);
    color: var(--c-ink);
  }
}

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--r-lg);
  transition: all 0.3s var(--ease-out);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn--sm {
  padding: 8px 20px;
  font-size: 0.875rem;
}
.btn--lg {
  padding: 16px 36px;
  font-size: 1rem;
}
.btn--grad {
  background: var(--grad);
  color: white;
  box-shadow: 0 4px 16px rgba(31,184,201,0.2);
}
.btn--grad:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(31,184,201,0.3);
}
.btn--ghost {
  color: var(--c-ink);
  border: 1.5px solid var(--c-line);
}
.btn--ghost:hover {
  border-color: var(--c-blue);
  color: var(--c-blue);
  background: var(--c-blue-50);
}
.btn--outline {
  border: 1.5px solid currentColor;
  color: var(--c-blue);
}
.btn--outline:hover {
  background: var(--c-blue);
  color: white;
}
.btn__arrow {
  width: 20px;
  height: 20px;
  transition: transform 0.3s var(--ease-out);
}
.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   小元件
   -------------------------------------------------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--r-pill);
  background: var(--c-paper-warm);
  border: 1px solid var(--c-line);
  color: var(--c-ink-4);
}
.chip--live {
  background: rgba(31,184,201,0.08);
  border-color: var(--c-blue);
  color: var(--c-blue-600);
}
.chip--live::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-blue);
  margin-right: 8px;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.chip--light {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.9);
}

.kicker {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-blue);
  margin-bottom: 16px;
}
.kicker--light {
  color: rgba(255,255,255,0.7);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8125rem;
  color: var(--c-ink-5);
  font-weight: 500;
  letter-spacing: 0.01em;
}
.eyebrow__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--grad);
}

/* --------------------------------------------------------------------------
   首屏 Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(180deg, #FAFBFD 0%, #FFFFFF 100%);
  padding: calc(var(--nav-h) + 60px) 0 80px;
}
.hero__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.4;
}
.hero__glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: var(--grad-glow);
  filter: blur(120px);
  z-index: 1;
  animation: glow 8s ease-in-out infinite alternate;
}
@keyframes glow {
  0% { opacity: 0.3; transform: translate(-50%, 0) scale(1); }
  100% { opacity: 0.5; transform: translate(-50%, -20px) scale(1.1); }
}
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: 1;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent);
}
.hero__inner {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 920px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.hero__title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 24px 0 28px;
}
.hero__sub {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: var(--c-ink-4);
  max-width: 720px;
  margin: 0 auto 40px;
}
.hero__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero__motto {
  font-size: 0.9375rem;
  color: var(--c-ink-5);
  font-style: italic;
  margin-bottom: 64px;
}
.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 32px;
  max-width: 700px;
  margin: 0 auto;
}
.stat {
  text-align: center;
}
.stat__num {
  font-size: 3rem;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 8px;
}
.stat__label {
  font-size: 0.875rem;
  color: var(--c-ink-5);
  font-weight: 500;
}
.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0.5;
  transition: opacity 0.3s ease;
}
.hero__scroll:hover { opacity: 1; }
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: var(--grad);
  animation: scrollHint 2s ease-in-out infinite;
}
@keyframes scrollHint {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(12px); opacity: 0.3; }
}

@media (max-width: 768px) {
  .hero { padding: calc(var(--nav-h) + 40px) 0 60px; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stat__num { font-size: 2.25rem; }
}

/* --------------------------------------------------------------------------
   章节头
   -------------------------------------------------------------------------- */
.sec-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 80px;
}
.sec-title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.sec-lead {
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.7;
  color: var(--c-ink-4);
  max-width: 680px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .sec-head { margin-bottom: 48px; }
}

/* --------------------------------------------------------------------------
   使命愿景 —— 三柱
   -------------------------------------------------------------------------- */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  margin-bottom: 100px;
}
.pillar {
  text-align: center;
  padding: 48px 32px;
  background: var(--c-paper);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-xl);
  transition: all 0.4s var(--ease-out);
}
.pillar:hover {
  border-color: var(--c-blue);
  box-shadow: var(--sh-2);
  transform: translateY(-4px);
}
.pillar__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  color: var(--c-blue);
}
.pillar h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.pillar__big {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 16px;
  color: var(--c-ink-2);
}
.pillar__desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-ink-4);
}

@media (max-width: 768px) {
  .pillars { gap: 24px; margin-bottom: 60px; }
  .pillar { padding: 32px 24px; }
}

/* 四大架构 */
.arch {
  background: var(--grad-soft);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-xl);
  padding: 64px 48px;
}
.arch__head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}
.arch__head h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.arch__head p {
  color: var(--c-ink-4);
  line-height: 1.7;
}
.arch__list {
  display: grid;
  gap: 24px;
  counter-reset: arch;
}
.arch__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  padding: 32px;
  background: var(--c-paper);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-lg);
  transition: all 0.3s ease;
}
.arch__item:hover {
  border-color: var(--c-blue);
  box-shadow: var(--sh-1);
}
.arch__no {
  font-size: 3rem;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  flex-shrink: 0;
}
.arch__item h4 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--c-ink-2);
}
.arch__item p {
  color: var(--c-ink-4);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .arch { padding: 40px 24px; }
  .arch__item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 24px;
  }
  .arch__no { font-size: 2rem; }
}

/* --------------------------------------------------------------------------
   数字世界 深色愿景带
   -------------------------------------------------------------------------- */
.world {
  position: relative;
  padding: 120px 0;
  color: white;
  overflow: hidden;
}
.world__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, #0B0E14 0%, #0F1729 100%);
  z-index: -2;
}
.world__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(31,184,201,0.15), transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(126,79,208,0.12), transparent 40%);
  z-index: -1;
}
.world__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black, transparent);
}
.world__inner {
  text-align: center;
}
.world__title {
  font-size: clamp(2rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  color: white;
}
.world__lead {
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.8;
  color: rgba(255,255,255,0.7);
  max-width: 820px;
  margin: 0 auto 64px;
}
.world__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
  margin-bottom: 80px;
}
.world__cell {
  padding: 40px 32px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-lg);
  backdrop-filter: blur(8px);
  transition: all 0.4s var(--ease-out);
}
.world__cell:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(31,184,201,0.4);
  transform: translateY(-4px);
}
.world__tag {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: var(--r-pill);
  background: rgba(31,184,201,0.15);
  color: var(--c-blue);
  margin-bottom: 16px;
}
.world__cell p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.8);
}
.world__quote {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 64px;
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.8;
  font-style: italic;
  color: rgba(255,255,255,0.85);
  border-left: 4px solid var(--c-blue);
  background: rgba(255,255,255,0.03);
  border-radius: var(--r-md);
}

@media (max-width: 768px) {
  .world { padding: 80px 0; }
  .world__grid { gap: 20px; }
  .world__cell { padding: 32px 24px; }
  .world__quote { padding: 32px 24px; font-size: 1.125rem; }
}

/* --------------------------------------------------------------------------
   产品矩阵 —— 双星 + TalkReel + 终极愿景 + 历史产品
   -------------------------------------------------------------------------- */
.stars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
  gap: 40px;
  margin-bottom: 64px;
}
.star {
  display: flex;
  flex-direction: column;
  padding: 48px;
  background: var(--c-paper);
  border: 2px solid var(--c-line-soft);
  border-radius: var(--r-xl);
  transition: all 0.4s var(--ease-out);
}
.star:hover {
  border-color: var(--c-blue);
  box-shadow: var(--sh-3);
  transform: translateY(-6px);
}
.star__top {
  margin-bottom: 24px;
}
.star__name {
  font-size: 2rem;
  font-weight: 800;
  margin: 16px 0 8px;
  line-height: 1.2;
}
.star__name span {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.star__pos {
  font-size: 0.9375rem;
  color: var(--c-ink-5);
  font-weight: 500;
}
.star__desc {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-ink-4);
  margin-bottom: 28px;
}
.star__feats {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
}
.star__feats li {
  display: flex;
  gap: 12px;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--c-ink-3);
}
.star__feats li::before {
  content: '◆';
  color: var(--c-blue);
  flex-shrink: 0;
  font-size: 0.75rem;
  margin-top: 3px;
}
.star__feats b {
  font-weight: 600;
  color: var(--c-ink);
}
.star__foot {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}
.star__note {
  font-size: 0.8125rem;
  color: var(--c-ink-5);
  line-height: 1.6;
}

@media (max-width: 1100px) {
  .stars { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .star { padding: 32px 24px; }
  .star__name { font-size: 1.75rem; }
}

/* TalkReel */
.talkreel {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 64px;
  align-items: center;
  padding: 64px 56px;
  background: linear-gradient(135deg, var(--c-blue-50) 0%, var(--c-violet-50) 100%);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-xl);
  margin-bottom: 64px;
  position: relative;
  overflow: hidden;
}
.talkreel::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line-soft) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.3;
  z-index: 0;
}
.talkreel__body, .talkreel__art {
  position: relative;
  z-index: 1;
}
.talkreel h3 {
  font-size: 2.25rem;
  font-weight: 800;
  margin: 16px 0 8px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.talkreel__cn {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-ink-4);
}
.talkreel__pos {
  font-size: 0.9375rem;
  color: var(--c-ink-5);
  font-weight: 500;
  margin-bottom: 20px;
}
.talkreel__desc {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-ink-4);
  margin-bottom: 24px;
}
.talkreel__desc b {
  font-weight: 600;
  color: var(--c-ink);
}
.talkreel__team {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.talkreel__team li {
  padding: 8px 16px;
  font-size: 0.8125rem;
  font-weight: 600;
  background: white;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  color: var(--c-ink-3);
}
.talkreel__note {
  font-size: 0.8125rem;
  color: var(--c-ink-5);
  line-height: 1.6;
  margin-bottom: 28px;
}

/* 轨道图（AI 编导 + 6 技能节点） */
.orbit {
  position: relative;
  width: 280px;
  height: 280px;
}
.orbit__core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 88px;
  height: 88px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  background: white;
  border: 3px solid var(--c-blue);
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(31,184,201,0.3);
  z-index: 10;
}
.orbit__ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 180px;
  height: 180px;
  border: 1px solid rgba(31,184,201,0.25);
  border-radius: 50%;
  animation: rotate 20s linear infinite;
}
.orbit__ring--2 {
  width: 240px;
  height: 240px;
  border-color: rgba(126,79,208,0.2);
  animation-duration: 30s;
  animation-direction: reverse;
}
@keyframes rotate {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}
.orbit__node {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  background: var(--grad);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(31,184,201,0.4);
  transform: translate(-50%, -50%) rotate(var(--a)) translateY(-120px);
}

@media (max-width: 960px) {
  .talkreel {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 48px 32px;
  }
  .talkreel__art {
    justify-self: center;
  }
}
@media (max-width: 768px) {
  .talkreel h3 { font-size: 1.875rem; }
  .orbit { width: 220px; height: 220px; }
  .orbit__core { width: 72px; height: 72px; font-size: 0.875rem; }
  .orbit__ring { width: 140px; height: 140px; }
  .orbit__ring--2 { width: 190px; height: 190px; }
  .orbit__node { transform: translate(-50%, -50%) rotate(var(--a)) translateY(-95px); }
}

/* 终极愿景卡 */
.vision-card {
  position: relative;
  padding: 72px 64px;
  background: linear-gradient(135deg, #0F1729 0%, #1E293B 100%);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-xl);
  color: white;
  margin-bottom: 80px;
  overflow: hidden;
}
.vision-card__glow {
  position: absolute;
  top: -20%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(126,79,208,0.3), transparent 60%);
  filter: blur(80px);
  z-index: 0;
}
.vision-card__body {
  position: relative;
  z-index: 1;
}
.vision-card h3 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin: 20px 0 28px;
  line-height: 1.2;
}
.vision-card p {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.8);
  max-width: 860px;
  margin-bottom: 40px;
}
.vision-card__stages {
  display: grid;
  gap: 24px;
}
.vision-card__stages > div {
  padding: 28px 32px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-left: 4px solid var(--c-blue);
  border-radius: var(--r-md);
  backdrop-filter: blur(8px);
  transition: all 0.3s ease;
}
.vision-card__stages > div:hover {
  background: rgba(255,255,255,0.08);
  border-left-color: var(--c-violet);
}
.vision-card__stages b {
  display: block;
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: white;
}
.vision-card__stages span {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .vision-card { padding: 48px 32px; }
  .vision-card__stages > div { padding: 20px 24px; }
}

/* 历史产品 */
.past {
  padding: 64px 0 0;
}
.past__head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}
.past__head h3 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.past__head p {
  color: var(--c-ink-4);
  line-height: 1.7;
}
.past__label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-ink-3);
  margin: 48px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}
.past__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.past__item {
  padding: 24px;
  background: var(--c-paper-warm);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-md);
  transition: all 0.3s ease;
}
.past__item:hover {
  background: var(--c-paper);
  border-color: var(--c-line);
  box-shadow: var(--sh-1);
}
.past__item b {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--c-ink);
}
.past__item span {
  display: block;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--c-ink-4);
  margin-bottom: 8px;
}
.past__item em {
  display: block;
  font-size: 0.75rem;
  font-style: normal;
  color: var(--c-ink-5);
}
.past__grid--oss .past__item {
  cursor: pointer;
}
.past__grid--oss .past__item:hover b {
  color: var(--c-blue);
}
.past__grid--oss .past__item em {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  color: var(--c-blue-600);
}

@media (max-width: 768px) {
  .past__grid { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   发展历程 —— 时间线
   -------------------------------------------------------------------------- */
.timeline {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 100px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--c-blue) 0%, var(--c-violet) 100%);
}
.tl {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 48px;
  padding: 40px 0;
  position: relative;
}
.tl::before {
  content: '';
  position: absolute;
  left: 91px;
  top: 52px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 0 6px var(--c-paper), 0 0 0 8px var(--c-line-soft);
  z-index: 10;
}
.tl--now::before {
  animation: pulse 2s ease-in-out infinite;
}
.tl__year {
  text-align: right;
  padding-right: 40px;
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}
.tl__year span {
  display: block;
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 8px;
  color: var(--c-ink-5);
  -webkit-text-fill-color: currentColor;
}
.tl__body {
  padding: 8px 0 8px 24px;
}
.tl__body h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--c-ink);
}
.tl__body ul {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.tl__body li {
  display: flex;
  gap: 12px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-ink-3);
}
.tl__body li::before {
  content: '→';
  color: var(--c-blue);
  flex-shrink: 0;
  font-weight: 700;
}
.tl__body b {
  font-weight: 600;
  color: var(--c-ink);
}

@media (max-width: 768px) {
  .timeline::before { left: 24px; }
  .tl {
    grid-template-columns: 1fr;
    gap: 16px;
    padding-left: 56px;
  }
  .tl::before {
    left: 15px;
    top: 12px;
  }
  .tl__year {
    text-align: left;
    padding-right: 0;
    font-size: 2rem;
  }
  .tl__body { padding-left: 0; }
}

/* --------------------------------------------------------------------------
   创始人
   -------------------------------------------------------------------------- */
.founder {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 80px;
  align-items: start;
}
.founder__portrait {
  position: sticky;
  top: calc(var(--nav-h) + 40px);
}
.founder__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--r-xl);
  overflow: hidden;
  background: var(--grad-soft);
  border: 2px solid var(--c-line-soft);
  box-shadow: var(--sh-2);
  margin-bottom: 28px;
}
.founder__photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.founder__mono {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--grad);
}
.founder__mono > span {
  font-size: 8rem;
  font-weight: 800;
  color: white;
  position: relative;
  z-index: 2;
}
.founder__monodots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.15) 2px, transparent 2px);
  background-size: 18px 18px;
  z-index: 1;
}
.founder__id h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.founder__id p {
  font-size: 0.9375rem;
  color: var(--c-ink-4);
  margin-bottom: 20px;
}
.founder__tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.875rem;
  font-weight: 600;
}
.founder__tags span {
  padding: 6px 14px;
  background: var(--grad-soft);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-pill);
  color: var(--c-ink-3);
}
.founder__tags i {
  font-style: normal;
  color: var(--c-ink-5);
}
.founder__intro {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--c-ink-3);
  margin-bottom: 48px;
}
.founder__intro b {
  font-weight: 700;
  color: var(--c-ink);
}
.founder__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}
.fcard {
  padding: 28px;
  background: var(--c-paper-warm);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-md);
  transition: all 0.3s ease;
}
.fcard:hover {
  background: var(--c-paper);
  box-shadow: var(--sh-1);
}
.fcard h4 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--c-ink);
}
.fcard p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-ink-4);
}
.founder__career {
  padding: 40px;
  background: var(--grad-soft);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-lg);
}
.founder__career h4 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--c-ink);
}
.founder__career ol {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.founder__career li {
  display: flex;
  gap: 16px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-ink-3);
}
.founder__career b {
  font-weight: 700;
  color: var(--c-blue);
  min-width: 72px;
  flex-shrink: 0;
}

@media (max-width: 1100px) {
  .founder {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .founder__portrait {
    position: static;
    max-width: 400px;
    margin: 0 auto;
  }
}
@media (max-width: 768px) {
  .founder__frame { border-radius: var(--r-lg); }
  .founder__mono > span { font-size: 5rem; }
  .founder__id h3 { font-size: 1.75rem; }
  .founder__grid { gap: 16px; }
  .fcard { padding: 20px; }
  .founder__career { padding: 28px 20px; }
}

/* --------------------------------------------------------------------------
   客户与成绩
   -------------------------------------------------------------------------- */
.clients {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 80px;
}
.clients__big {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px;
  background: var(--grad);
  border-radius: var(--r-xl);
  color: white;
  text-align: center;
}
.clients__num {
  font-size: clamp(4rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 1;
  margin-bottom: 16px;
}
.clients__num span {
  font-size: 0.6em;
}
.clients__num--sm {
  font-size: 3.5rem;
}
.clients__cap {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.clients__sub {
  font-size: 0.9375rem;
  opacity: 0.85;
  line-height: 1.6;
}
.clients__side {
  display: grid;
  gap: 20px;
}
.clients__cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 32px;
  background: var(--c-paper);
  border: 2px solid var(--c-line-soft);
  border-radius: var(--r-lg);
  text-align: center;
  transition: all 0.3s ease;
}
.clients__cell:hover {
  border-color: var(--c-blue);
  box-shadow: var(--sh-2);
}
.clients__cell--wide {
  grid-column: span 2;
  padding: 32px;
}
.clients__cell .clients__num {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.clients__cell .clients__cap {
  color: var(--c-ink);
  font-size: 1rem;
}
.clients__names {
  font-size: 0.875rem;
  color: var(--c-ink-4);
  line-height: 1.7;
  margin-top: 8px;
}

@media (max-width: 960px) {
  .clients {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .clients__big {
    grid-row: auto;
    padding: 48px 32px;
  }
  .clients__side {
    grid-template-columns: 1fr 1fr;
  }
  .clients__cell--wide {
    grid-column: span 2;
  }
}
@media (max-width: 600px) {
  .clients__side {
    grid-template-columns: 1fr;
  }
  .clients__cell--wide {
    grid-column: auto;
  }
}

.whyus {
  padding: 64px 56px;
  background: var(--grad-soft);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-xl);
}
.whyus h3 {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 48px;
}
.whyus__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}
.whyus__grid > div {
  padding: 32px;
  background: var(--c-paper);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-md);
  transition: all 0.3s ease;
}
.whyus__grid > div:hover {
  box-shadow: var(--sh-1);
  border-color: var(--c-blue);
}
.whyus__grid b {
  display: block;
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--c-ink);
}
.whyus__grid span {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-ink-4);
}

@media (max-width: 768px) {
  .whyus { padding: 40px 28px; }
  .whyus__grid { gap: 16px; }
  .whyus__grid > div { padding: 24px; }
}

/* --------------------------------------------------------------------------
   联系我们
   -------------------------------------------------------------------------- */
.contact {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 64px;
}
.contact__card {
  padding: 48px;
  background: var(--grad-soft);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-xl);
  text-align: center;
}
.contact__card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
}
.contact__qr {
  width: 240px;
  height: 240px;
  margin: 0 auto 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--c-line);
}
.contact__qr-cap {
  font-size: 0.875rem;
  color: var(--c-ink-4);
  margin-bottom: 32px;
}
.contact__info {
  display: grid;
  gap: 16px;
  text-align: left;
}
.contact__info > div {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 12px;
  padding: 16px 20px;
  background: var(--c-paper);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-md);
}
.contact__info dt {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--c-ink-3);
}
.contact__info dd {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-ink);
}
.contact__info a {
  transition: color 0.2s ease;
}
.contact__info a:hover {
  color: var(--c-blue);
}
.contact__info--full > div {
  grid-template-columns: 80px 1fr;
}

.contact__links h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
}
.contact__links-h {
  margin-top: 48px;
}
.clink {
  display: block;
  padding: 24px 28px;
  background: var(--c-paper);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--r-lg);
  margin-bottom: 16px;
  transition: all 0.3s ease;
}
.clink:hover {
  border-color: var(--c-blue);
  box-shadow: var(--sh-1);
  transform: translateX(4px);
}
.clink__name {
  display: block;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 6px;
}
.clink__url {
  display: block;
  font-size: 0.875rem;
  font-family: var(--f-mono);
  color: var(--c-blue-600);
}

@media (max-width: 1000px) {
  .contact {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .contact__card {
    max-width: 400px;
    margin: 0 auto;
  }
}
@media (max-width: 768px) {
  .contact__card { padding: 32px 24px; }
  .contact__qr { width: 200px; height: 200px; }
}

/* --------------------------------------------------------------------------
   页脚
   -------------------------------------------------------------------------- */
.foot {
  background: var(--c-ink);
  color: rgba(255,255,255,0.7);
  padding: 80px 0 32px;
}
.foot__inner {
  display: flex;
  justify-content: space-between;
  align-items: start;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 32px;
}
.foot__brand {
  display: flex;
  align-items: center;
  gap: 16px;
}
.foot__brand img {
  width: 56px;
  height: 56px;
}
.foot__name {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: 4px;
}
.foot__name em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.foot__slogan {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
}
.foot__nav {
  display: flex;
  gap: 32px;
}
.foot__nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.2s ease;
}
.foot__nav a:hover {
  color: white;
}
.foot__bar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
}

@media (max-width: 768px) {
  .foot { padding: 60px 0 24px; }
  .foot__inner {
    flex-direction: column;
    gap: 32px;
    align-items: start;
  }
  .foot__nav {
    flex-direction: column;
    gap: 16px;
  }
  .foot__bar {
    flex-direction: column;
    gap: 12px;
  }
}

.foot__bar a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  transition: color 0.2s ease;
}
.foot__bar a:hover {
  color: white;
}