/* ═══════════════════════════════════════════════════════════
   耶数智能官网 · Yeshu Intelligence Official Site
   Design System: 深蓝登山 + 哑金高光 + 玻璃拟态 + 编辑感衬线
   ═══════════════════════════════════════════════════════════ */

/* ───────── Design Tokens ───────── */
:root {
  /* 主色 · 深蓝 */
  --navy-950: #050A18;
  --navy-900: #0A1128;
  --navy-800: #0F1B3D;
  --navy-700: #1A2340;
  --navy-600: #2A3559;
  --navy-500: #45527D;

  /* 强调 · 哑金 */
  --gold-500: #C9A961;
  --gold-400: #E5C462;
  --gold-300: #F0D78A;
  --gold-700: #8B7339;
  --gold-grad: linear-gradient(135deg, #E5C462 0%, #C9A961 50%, #B8934A 100%);
  --gold-grad-hover: linear-gradient(135deg, #F0D78A 0%, #E5C462 50%, #C9A961 100%);

  /* 中性 */
  --slate-50:  #F8F9FC;
  --slate-100: #EEF1F7;
  --slate-200: #DDE2EC;
  --slate-400: #97A3BD;
  --slate-600: #4E5A7A;

  /* 语义 */
  --success: #4ADE80;
  --danger:  #EF4444;

  /* 排版 */
  --f-serif: 'Playfair Display', 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --f-sans:  'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --f-mono:  'JetBrains Mono', 'Fira Code', 'Menlo', 'Consolas', monospace;

  /* 布局 */
  --container: 1280px;
  --gutter: clamp(20px, 5vw, 56px);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(10, 17, 40, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 17, 40, 0.10);
  --shadow-lg: 0 20px 48px rgba(10, 17, 40, 0.14);
  --shadow-glow: 0 0 60px rgba(201, 169, 97, 0.25);

  /* 过渡 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ───────── Reset & Base ───────── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--navy-900);
  background: var(--slate-50);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
input, select { font: inherit; }

h1, h2, h3, h4, h5 {
  font-family: var(--f-serif);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}

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

/* ───────── 顶部导航 ───────── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  transition: all 0.4s var(--ease);
  background: transparent;
}
.site-header.scrolled {
  padding: 10px 0;
  background: rgba(10, 17, 40, 0.85);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 1px 0 rgba(201, 169, 97, 0.15);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
}
.brand-mark { display: flex; }
.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.14), 0 2px 10px rgba(0,0,0,0.4), 0 0 16px rgba(70,140,255,0.28);
  transition: transform 0.4s var(--ease);
}
.brand:hover .brand-logo { transform: scale(1.06); }
.brand-txt { display: flex; flex-direction: column; line-height: 1.1; }
.brand-cn { font-family: var(--f-serif); font-size: 20px; font-weight: 700; letter-spacing: 0.02em; }
.brand-en { font-family: var(--f-mono); font-size: 9px; letter-spacing: 0.22em; color: var(--gold-400); margin-top: 2px; }

.primary-nav {
  margin-left: auto;
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
  font-weight: 500;
}
.primary-nav a {
  position: relative;
  padding: 6px 0;
  transition: color 0.25s;
}
.primary-nav a:hover { color: var(--gold-400); }
.primary-nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%; right: 50%;
  height: 1px;
  background: var(--gold-400);
  transition: all 0.35s var(--ease);
}
.primary-nav a:hover::after { left: 0; right: 0; }

.nav-cta {
  padding: 9px 20px;
  border-radius: 999px;
  border: 1px solid rgba(201, 169, 97, 0.5);
  color: var(--gold-400);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: all 0.3s var(--ease);
}
.nav-cta:hover { background: var(--gold-grad); color: var(--navy-900); border-color: transparent; }
.nav-cta span { display: inline-block; transition: transform 0.3s; }
.nav-cta:hover span { transform: translate(2px, -2px); }

.nav-toggle { display: none; }

/* ───────── Hero ───────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 140px 0 100px;
  color: #fff;
  overflow: hidden;
  background: radial-gradient(ellipse at top, #0F1B3D 0%, #070D1F 60%, #050A18 100%);
}
.hero-bg { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.hero-photo {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 40%;
  opacity: 0.55;
  filter: saturate(0.85) contrast(1.05);
}
.hero-veil {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7,13,31,0.55) 0%, rgba(10,17,40,0.75) 55%, rgba(5,10,24,0.92) 100%);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(201, 169, 97, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 169, 97, 0.08) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 30%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 30%, #000 40%, transparent 100%);
}
.hero-glow {
  position: absolute;
  width: 60vw; height: 60vw;
  max-width: 700px; max-height: 700px;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.35;
  animation: float 18s ease-in-out infinite;
}
.glow-a { background: radial-gradient(circle, #C9A961, transparent 65%); top: -10%; left: -10%; }
.glow-b { background: radial-gradient(circle, #4A6BA8, transparent 65%); bottom: -20%; right: -10%; animation-delay: -6s; opacity: 0.28; }
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.08); }
}

.hero-inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  text-align: center;
  z-index: 2;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border: 1px solid rgba(201, 169, 97, 0.35);
  border-radius: 999px;
  background: rgba(201, 169, 97, 0.06);
  backdrop-filter: blur(10px);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold-400);
  margin-bottom: 32px;
}
.hero-eyebrow .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gold-400);
  box-shadow: 0 0 12px var(--gold-400);
  animation: pulse 2s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero-title {
  font-family: var(--f-serif);
  font-size: clamp(38px, 7vw, 82px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 32px;
}
.hero-title .line-1, .hero-title .line-2 { display: block; }
.hero-title .line-2 { margin-top: 4px; }
.hero-title .hl {
  background: var(--gold-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-style: italic;
  padding: 0 4px;
}

.hero-sub {
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.75);
  max-width: 720px;
  margin: 0 auto 44px;
}
.hero-sub b { color: var(--gold-400); font-weight: 500; }

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 72px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: all 0.35s var(--ease);
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--gold-grad);
  color: var(--navy-900);
  box-shadow: 0 8px 24px rgba(201, 169, 97, 0.3);
}
.btn-primary:hover {
  background: var(--gold-grad-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(201, 169, 97, 0.45);
}
.btn-primary span { transition: transform 0.3s; }
.btn-primary:hover span { transform: translateX(4px); }
.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover { border-color: var(--gold-400); color: var(--gold-400); background: rgba(201, 169, 97, 0.06); }
.btn-outline {
  border: 1px solid var(--navy-900);
  color: var(--navy-900);
  background: transparent;
}
.btn-outline:hover { background: var(--navy-900); color: var(--gold-400); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(20px, 3vw, 60px);
  padding: 32px clamp(20px, 4vw, 40px);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(201, 169, 97, 0.15);
  max-width: 900px;
  margin: 0 auto;
}
.stat { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.stat .num {
  font-family: var(--f-serif);
  font-size: clamp(36px, 4.5vw, 56px);
  font-weight: 700;
  line-height: 1;
  background: var(--gold-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat .unit { font-size: 14px; color: var(--gold-400); }
.stat .label { font-size: 12px; color: rgba(255, 255, 255, 0.55); letter-spacing: 0.05em; margin-top: 6px; }

.scroll-hint {
  position: absolute;
  bottom: 32px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.4);
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  z-index: 2;
}
.mouse {
  width: 22px; height: 34px;
  border: 1.5px solid currentColor;
  border-radius: 12px;
  position: relative;
}
.wheel {
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 3px; height: 6px;
  background: currentColor;
  border-radius: 2px;
  animation: wheel 1.8s infinite;
}
@keyframes wheel { 0% { opacity: 1; top: 6px; } 100% { opacity: 0; top: 20px; } }

/* ───────── Section 通用 ───────── */
.section { padding: clamp(80px, 12vh, 140px) 0; position: relative; }
.section.dark {
  background: linear-gradient(180deg, var(--navy-900) 0%, var(--navy-800) 100%);
  color: #fff;
}
.section.dark .section-desc { color: rgba(255, 255, 255, 0.65); }
.section.dark .section-desc b { color: var(--gold-400); }
.section.dark .eyebrow { color: var(--gold-400); }
.section.dark .section-title { color: #fff; }

.section-head {
  text-align: center;
  margin-bottom: clamp(48px, 8vh, 80px);
}
.eyebrow {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--gold-700);
  text-transform: uppercase;
  margin-bottom: 16px;
  display: inline-block;
  padding: 4px 12px;
  border-radius: 4px;
  background: rgba(201, 169, 97, 0.08);
}
.section-title {
  font-size: clamp(28px, 4.2vw, 48px);
  color: var(--navy-900);
  margin-bottom: 20px;
}
.title-sep {
  display: inline-block;
  margin: 0 12px;
  color: var(--gold-500);
  font-style: normal;
}
.section-desc {
  max-width: 720px;
  margin: 0 auto;
  font-size: clamp(15px, 1.4vw, 17px);
  color: var(--slate-600);
  line-height: 1.85;
}
.section-desc b { color: var(--navy-900); font-weight: 500; }

/* ───────── Reveal 动画 ───────── */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }

/* ───────── About 定位卡 ───────── */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 60px;
}
.about-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 5 / 4;
}
.about-visual img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.8s var(--ease);
}
.about-visual:hover img { transform: scale(1.04); }
.about-visual-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 16px 20px;
  background: linear-gradient(180deg, transparent, rgba(7,13,31,0.85));
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.85);
}
.cap-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gold-400);
  box-shadow: 0 0 10px var(--gold-400);
  animation: pulse 2s infinite;
}
.about-cards {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.position-card {
  padding: 44px 32px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--slate-200);
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}
.position-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gold-grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease);
}
.position-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.position-card:hover::before { transform: scaleX(1); }
.pos-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(201,169,97,0.15), rgba(201,169,97,0.05));
  color: var(--gold-700);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
}
.pos-icon svg { width: 26px; height: 26px; }
.position-card h3 { font-size: 24px; margin-bottom: 4px; }
.pos-en {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--gold-500);
  margin-bottom: 20px !important;
}
.position-card p:not(.pos-en) { color: var(--slate-600); font-size: 15px; line-height: 1.8; margin: 0; }
.position-card b { color: var(--navy-900); font-weight: 500; }

.creed {
  text-align: center;
  padding: 48px 24px;
  margin: 0;
  border-top: 1px solid var(--slate-200);
  border-bottom: 1px solid var(--slate-200);
  position: relative;
}
.creed p {
  font-family: var(--f-serif);
  font-size: clamp(20px, 2.4vw, 28px);
  font-style: italic;
  color: var(--navy-800);
  margin: 0 0 12px;
  line-height: 1.5;
}
.creed cite {
  font-style: normal;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold-700);
}

/* ───────── Products 三大旗舰 ───────── */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.product-card {
  padding: 36px 32px 32px;
  background: linear-gradient(180deg, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0.02) 100%);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
  transition: all 0.5s var(--ease);
}
.product-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 20%), rgba(201,169,97,0.14), transparent 45%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
.product-card:hover {
  transform: translateY(-8px);
  border-color: rgba(201, 169, 97, 0.4);
  box-shadow: 0 30px 60px rgba(0,0,0,0.35), var(--shadow-glow);
}
.product-card:hover::after { opacity: 1; }

.pc-badge {
  position: absolute;
  top: 20px; right: 20px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(201, 169, 97, 0.15);
  color: var(--gold-400);
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  border: 1px solid rgba(201, 169, 97, 0.3);
  z-index: 2;
}

.pc-visual {
  height: 220px;
  margin: -8px -32px 28px;
  position: relative;
  overflow: hidden;
  border-radius: 0;
}
.pc-visual img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease), filter 0.5s;
  filter: saturate(0.9) brightness(0.92);
}
.product-card:hover .pc-visual img {
  transform: scale(1.06);
  filter: saturate(1.05) brightness(1);
}
.pc-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(10,17,40,0.6) 100%);
  pointer-events: none;
}

.pc-name {
  font-family: var(--f-serif);
  font-size: 26px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}
.pc-name-en {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--gold-400);
  letter-spacing: 0.16em;
  font-weight: 400;
  margin-left: 6px;
}
.pc-tag { font-size: 14px; color: rgba(255,255,255,0.55); margin: 0 0 20px; padding-bottom: 20px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.pc-features { list-style: none; padding: 0; margin: 0 0 24px; font-size: 14px; }
.pc-features li {
  padding: 8px 0 8px 22px;
  color: rgba(255,255,255,0.75);
  position: relative;
  line-height: 1.7;
}
.pc-features li::before {
  content: '';
  position: absolute;
  left: 0; top: 14px;
  width: 10px; height: 1.5px;
  background: var(--gold-500);
}
.pc-features b { color: var(--gold-400); font-weight: 500; margin-right: 4px; }
.pc-foot { padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.08); }
.link-arrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--gold-400); letter-spacing: 0.05em; transition: gap 0.3s; }
.link-arrow:hover { gap: 14px; }

/* ───────── Tech 技术底座 ───────── */
.tech { background: var(--slate-50); }
.tech-stack {
  max-width: 960px;
  margin: 0 auto 60px;
  padding: 44px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--slate-200);
}
.stack-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.stack-arrow { display: flex; justify-content: center; margin: 8px 0 20px; }
.stack-arrow svg { width: 40px; height: 24px; }
.stack-node {
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  background: var(--navy-900);
  color: #fff;
  letter-spacing: 0.02em;
}
.stack-node.sn-product { background: linear-gradient(135deg, var(--navy-800), var(--navy-600)); box-shadow: 0 4px 12px rgba(10,17,40,0.15); }
.stack-node.dim { opacity: 0.55; }
.core-node {
  padding: 14px 22px;
  background: var(--gold-grad);
  color: var(--navy-900);
  border-radius: 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(201,169,97,0.25);
}
.row-core { padding: 16px; background: linear-gradient(90deg, transparent, rgba(201,169,97,0.06), transparent); border-radius: 12px; }
.infra-node {
  padding: 12px 18px;
  border: 1px dashed var(--slate-400);
  border-radius: 10px;
  font-size: 13px;
  color: var(--slate-600);
  background: #fff;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.infra-tag {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--gold-700);
  padding: 2px 8px;
  background: rgba(201,169,97,0.1);
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.tech-promise {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1080px;
  margin: 0 auto;
}
.promise-item {
  padding: 32px 24px;
  background: #fff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  position: relative;
  transition: all 0.35s var(--ease);
}
.promise-item:hover { border-color: var(--gold-500); transform: translateY(-4px); box-shadow: var(--shadow-md); }
.p-num {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--gold-500);
  letter-spacing: 0.15em;
  display: block;
  margin-bottom: 12px;
}
.p-title { font-family: var(--f-serif); font-size: 20px; color: var(--navy-900); display: block; margin-bottom: 10px; }
.p-txt { font-size: 14px; color: var(--slate-600); line-height: 1.75; }

/* ───────── Join ───────── */
.join {
  background: var(--slate-50);
  position: relative;
  overflow: hidden;
}
.join-hero-img {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.join-hero-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.12;
  filter: saturate(0.6);
}
.join-hero-veil {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(248,249,252,0.92) 0%, rgba(248,249,252,0.98) 100%);
}
.join .container { position: relative; z-index: 1; }
.join-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.join-txt .section-title { text-align: left; }
.join-txt .eyebrow { display: inline-block; }
.join-txt .section-desc { margin: 0 0 32px; text-align: left; }
.wall-rules { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-bottom: 32px; }
.rule {
  padding: 14px 18px;
  background: #fff;
  border-left: 3px solid var(--gold-500);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--navy-900);
  transition: all 0.3s var(--ease);
}
.rule:hover { transform: translateX(4px); border-left-color: var(--navy-900); }
.r-num { font-family: var(--f-mono); font-size: 11px; color: var(--gold-700); letter-spacing: 0.1em; }
.join-cta { display: flex; gap: 12px; flex-wrap: wrap; }

.join-side { padding: 40px; background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); border: 1px solid var(--slate-200); }
.benefit-list { display: flex; flex-direction: column; gap: 22px; }
.benefit { display: flex; gap: 16px; align-items: flex-start; padding-bottom: 20px; border-bottom: 1px dashed var(--slate-200); }
.benefit:last-child { border-bottom: none; padding-bottom: 0; }
.bf-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(201,169,97,0.15), rgba(201,169,97,0.05));
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.benefit h4 { font-family: var(--f-serif); font-size: 16px; color: var(--navy-900); margin-bottom: 4px; }
.benefit p { font-size: 13px; color: var(--slate-600); line-height: 1.7; margin: 0; }

/* ───────── Final CTA ───────── */
.final-cta {
  padding: clamp(80px, 12vh, 120px) 0;
  background: linear-gradient(135deg, var(--navy-950) 0%, var(--navy-800) 60%, #1a2b5a 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.final-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 169, 97, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 169, 97, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
}
.final-inner { text-align: center; position: relative; max-width: 720px; margin: 0 auto; }
.final-title {
  font-family: var(--f-serif);
  font-size: clamp(28px, 4.5vw, 52px);
  line-height: 1.2;
  margin-bottom: 12px;
}
.final-title .hl {
  background: var(--gold-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-style: italic;
}
.final-sub {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--gold-400);
  margin-bottom: 44px;
}
.final-form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; max-width: 620px; margin: 0 auto; }
.final-form input, .final-form select {
  padding: 14px 18px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 999px;
  color: #fff;
  font-size: 14px;
  outline: none;
  transition: all 0.3s;
}
.final-form select option { background: var(--navy-800); color: #fff; }
.final-form input::placeholder { color: rgba(255,255,255,0.4); }
.final-form input:focus, .final-form select:focus { border-color: var(--gold-400); background: rgba(255,255,255,0.1); }
.final-form button { grid-column: span 2; padding: 14px 30px; }
.ff-ok {
  grid-column: span 2;
  font-size: 13px;
  color: var(--success);
  opacity: 0;
  transform: translateY(6px);
  transition: all 0.5s;
  font-family: var(--f-mono);
  letter-spacing: 0.05em;
}
.ff-ok.show { opacity: 1; transform: none; }

/* ───────── Footer ───────── */
.site-footer {
  background: var(--navy-950);
  color: rgba(255,255,255,0.6);
  padding: 60px 0 30px;
  font-size: 13px;
  border-top: 1px solid rgba(201, 169, 97, 0.1);
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.foot-logo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 18px;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.14), 0 4px 18px rgba(0,0,0,0.45), 0 0 24px rgba(70,140,255,0.22);
}
.foot-brand .brand-cn { font-family: var(--f-serif); font-size: 26px; color: #fff; margin-bottom: 2px; }
.foot-brand .brand-en { font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.24em; color: var(--gold-400); margin-bottom: 20px; }
.foot-mission { font-size: 13px; color: rgba(255,255,255,0.55); line-height: 1.9; margin: 0; }
.foot-col h5 { font-family: var(--f-serif); font-size: 15px; color: #fff; margin-bottom: 16px; }
.foot-col a { display: block; padding: 6px 0; color: rgba(255,255,255,0.6); transition: color 0.25s; }
.foot-col a:hover { color: var(--gold-400); }
.foot-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-family: var(--f-mono);
  font-size: 11px;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.05em;
}
.foot-sep { color: rgba(201,169,97,0.4); }

/* ───────── Responsive ───────── */
@media (max-width: 1024px) {
  .about-layout { grid-template-columns: 1fr; gap: 32px; }
  .about-visual { aspect-ratio: 16 / 9; }
  .product-grid, .tech-promise { grid-template-columns: 1fr; }
  .join-layout { grid-template-columns: 1fr; gap: 40px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .primary-nav { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; flex-direction: column; gap: 4px; margin-left: auto; padding: 8px; }
  .nav-toggle span { width: 22px; height: 1.5px; background: #fff; transition: all 0.3s; }
  .site-header.menu-open .nav-toggle span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
  .site-header.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .site-header.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }
  .site-header.menu-open .primary-nav {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: rgba(10,17,40,0.96);
    backdrop-filter: blur(20px);
    padding: 20px var(--gutter);
    gap: 16px;
    border-top: 1px solid rgba(201,169,97,0.2);
  }
  .hero { padding: 120px 0 80px; }
  .hero-title { font-size: clamp(32px, 8vw, 48px); }
  .tech-stack { padding: 24px 16px; }
  .core-node { padding: 10px 14px; font-size: 11px; }
  .wall-rules { grid-template-columns: 1fr; }
  .final-form { grid-template-columns: 1fr; }
  .final-form button, .ff-ok { grid-column: 1; }
  .foot-grid { grid-template-columns: 1fr; gap: 24px; }
  .pc-visual { margin: -8px -20px 24px; height: 180px; }
  .product-card { padding: 28px 20px 24px; }
}