/* ===== 智拓GEO Design System ===== */
/* 暗色主题（默认） */
:root,
[data-theme="dark"] {
  --color-bg: #040b16;
  --color-surface: #0a1628;
  --color-surface-2: #0f1d32;
  --color-border: rgba(56, 130, 246, 0.12);
  --color-border-strong: rgba(56, 130, 246, 0.25);
  --color-primary: #3b82f6;
  --color-primary-glow: rgba(59, 130, 246, 0.4);
  --color-accent: #06b6d4;
  --color-accent-glow: rgba(6, 182, 212, 0.35);
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-white: #ffffff;
  --color-nav-bg: rgba(4, 11, 22, 0.85);
  --color-card-bg-start: rgba(15, 29, 50, 0.7);
  --color-card-bg-end: rgba(10, 22, 40, 0.9);
  --color-footer-bg: #0a1628;
  --color-footer-border: rgba(56, 130, 246, 0.12);
  --color-input-bg: #040b16;
  --color-stat-before: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  --color-benefit-num: rgba(59, 130, 246, 0.2);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.08);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --section-bg-gradient: linear-gradient(180deg, transparent, rgba(59, 130, 246, 0.03));
  --section-hero-bg: radial-gradient(ellipse at 50% 0%, rgba(59, 130, 246, 0.06) 0%, transparent 60%);
  --cta-bg: radial-gradient(ellipse at 50% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
}

/* 浅色主题 */
[data-theme="light"] {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-2: #f1f5f9;
  --color-border: rgba(56, 130, 246, 0.15);
  --color-border-strong: rgba(56, 130, 246, 0.3);
  --color-primary: #2563eb;
  --color-primary-glow: rgba(37, 99, 235, 0.2);
  --color-accent: #0891b2;
  --color-accent-glow: rgba(8, 145, 178, 0.2);
  --color-success: #059669;
  --color-warning: #d97706;
  --color-text: #1e293b;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-white: #0f172a;
  --color-nav-bg: rgba(248, 250, 252, 0.9);
  --color-card-bg-start: rgba(255, 255, 255, 0.8);
  --color-card-bg-end: rgba(241, 245, 249, 0.9);
  --color-footer-bg: #ffffff;
  --color-footer-border: rgba(56, 130, 246, 0.15);
  --color-input-bg: #ffffff;
  --color-stat-before: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  --color-benefit-num: rgba(37, 99, 235, 0.12);
  --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.06);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
  --section-bg-gradient: linear-gradient(180deg, transparent, rgba(37, 99, 235, 0.02));
  --section-hero-bg: radial-gradient(ellipse at 50% 0%, rgba(37, 99, 235, 0.04) 0%, transparent 60%);
  --cta-bg: radial-gradient(ellipse at 50% 50%, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
}

/* ===== Shared Design Tokens ===== */
:root {
  --font-primary: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1240px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

/* ===== Animated Background Grid ===== */
.bg-grid {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(rgba(59,130,246,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 50% 0% at 50% 0%, black 40%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 50% 0% at 50% 0%, black 40%, transparent 70%);
}
.bg-orb {
  position: fixed; border-radius: 50%; filter: blur(120px); opacity: 0.15; pointer-events: none; z-index: 0;
}
.bg-orb-1 { width: 600px; height: 600px; background: var(--color-primary); top: -200px; left: -100px; animation: orbFloat 12s ease-in-out infinite; }
.bg-orb-2 { width: 450px; height: 450px; background: var(--color-accent); top: 40%; right: -150px; animation: orbFloat 15s ease-in-out infinite reverse; }
.bg-orb-3 { width: 350px; height: 350px; background: #7c3aed; bottom: -100px; left: 40%; animation: orbFloat 18s ease-in-out infinite; }
@keyframes orbFloat {
  0%, 100% { transform: translate(0,0) scale(1); }
  33% { transform: translate(30px,-30px) scale(1.05); }
  66% { transform: translate(-20px,20px) scale(0.95); }
}

/* ===== Navigation ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--color-nav-bg); backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-border); transition: var(--transition);
}
.nav-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; height: 70px;
}
.nav-logo {
  display: flex; align-items: center; gap: 12px; text-decoration: none;
  font-size: 1.2rem; font-weight: 700; color: var(--color-white); letter-spacing: -0.02em;
}
.nav-logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 1rem;
  box-shadow: 0 4px 16px var(--color-primary-glow);
}
.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav-links a {
  text-decoration: none; color: var(--color-text-secondary); font-size: 0.88rem;
  font-weight: 500; padding: 8px 16px; border-radius: var(--radius-sm); transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--color-white); background: rgba(59,130,246,0.1); }
.nav-cta { 
  background: linear-gradient(135deg, var(--color-primary), #2563eb) !important; 
  color: #fff !important; padding: 9px 22px !important; font-weight: 600 !important; 
  box-shadow: 0 2px 12px var(--color-primary-glow);
}
.nav-cta:hover { box-shadow: 0 4px 20px var(--color-primary-glow); transform: translateY(-1px); }
.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--color-text); margin: 5px 0; transition: var(--transition); border-radius: 2px; }

/* Theme Toggle Button */
.theme-toggle {
  background: none; border: 1px solid var(--color-border); cursor: pointer;
  padding: 6px 10px; border-radius: var(--radius-sm); font-size: 1.1rem;
  line-height: 1; color: var(--color-text-secondary); transition: var(--transition);
  margin-left: 4px; display: flex; align-items: center; gap: 4px;
}
.theme-toggle:hover { color: var(--color-white); border-color: var(--color-border-strong); background: rgba(59,130,246,0.08); }

/* ===== Page ===== */
.page { position: relative; z-index: 1; }
.page-section { padding: 100px 0; position: relative; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 28px; position: relative; z-index: 1; }

/* ===== Typography ===== */
.tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.78rem; font-weight: 600; color: var(--color-accent);
  padding: 5px 14px; border: 1px solid rgba(6,182,212,0.25);
  border-radius: 100px; letter-spacing: 0.06em; text-transform: uppercase;
  background: rgba(6,182,212,0.06); margin-bottom: 20px;
}
.tag::before { content: ''; width: 6px; height: 6px; background: var(--color-accent); border-radius: 50%; box-shadow: 0 0 8px var(--color-accent-glow); }
.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 800; line-height: 1.22;
  margin-bottom: 18px; letter-spacing: -0.025em; color: var(--color-white);
}
.section-subtitle {
  font-size: 1.05rem; color: var(--color-text-secondary); max-width: 560px; line-height: 1.7;
}
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* ===== Hero ===== */
.hero {
  min-height: 95vh; display: flex; align-items: center; padding-top: 70px;
  position: relative; overflow: hidden;
}
.hero .container {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 64px; align-items: center;
}
.hero-badge {
  display: inline-block; background: rgba(59,130,246,0.12); color: var(--color-primary);
  padding: 6px 18px; border-radius: 100px; font-size: 0.8rem; font-weight: 600;
  margin-bottom: 28px; border: 1px solid rgba(59,130,246,0.2); letter-spacing: 0.04em;
}
.hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 3.6rem); font-weight: 800; line-height: 1.15;
  margin-bottom: 24px; letter-spacing: -0.03em; color: var(--color-white);
}
.hero h1 .hl { background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.1rem; color: var(--color-text-secondary); margin-bottom: 36px; max-width: 500px; line-height: 1.7; }
.hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 14px 30px;
  border-radius: var(--radius-sm); font-size: 0.93rem; font-weight: 600;
  text-decoration: none; cursor: pointer; border: none; transition: var(--transition);
  letter-spacing: 0.01em; position: relative; overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #2563eb);
  color: #fff; box-shadow: 0 4px 24px var(--color-primary-glow);
}
.btn-primary:hover { box-shadow: 0 6px 32px var(--color-primary-glow); transform: translateY(-2px); }
.btn-outline {
  background: transparent; color: var(--color-primary);
  border: 1.5px solid rgba(59,130,246,0.3);
}
.btn-outline:hover { background: rgba(59,130,246,0.08); border-color: var(--color-primary); }
.btn-white { background: #fff; color: #0a1628; font-weight: 700; }
.btn-white:hover { background: #e2e8f0; }

/* Hero Dashboard */
.hero-dash {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 28px; box-shadow: var(--shadow-card);
}
.hero-dash-header { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; padding-bottom: 14px; border-bottom: 1px solid var(--color-border); }
.hero-dash-dot { width: 10px; height: 10px; border-radius: 50%; }
.hero-dash-dot.r { background: #ef4444; }
.hero-dash-dot.y { background: #f59e0b; }
.hero-dash-dot.g { background: #10b981; }
.hero-dash-title { font-size: 0.78rem; color: var(--color-text-muted); margin-left: 8px; font-family: var(--font-mono); }
.hero-metric-row { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-bottom: 18px; }
.hero-metric {
  background: rgba(59,130,246,0.05); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); padding: 16px 14px; text-align: center;
}
.hero-metric .val { font-size: 1.6rem; font-weight: 800; font-family: var(--font-mono); color: var(--color-white); }
.hero-metric .lbl { font-size: 0.7rem; color: var(--color-text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.04em; }
.hero-bar { background: var(--color-surface); border-radius: var(--radius-sm); padding: 14px 16px; border: 1px solid var(--color-border); }
.hero-bar-item { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.hero-bar-item:last-child { margin-bottom: 0; }
.hero-bar-label { font-size: 0.8rem; color: var(--color-text-secondary); }
.hero-bar-track { flex: 1; height: 6px; background: rgba(255,255,255,0.05); border-radius: 3px; margin: 0 12px; overflow: hidden; }
.hero-bar-fill { height: 100%; border-radius: 3px; background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); transition: width 1.5s ease; }
.hero-bar-val { font-size: 0.78rem; font-weight: 600; color: var(--color-white); font-family: var(--font-mono); width: 48px; text-align: right; }

/* ===== Stats Section ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat-card {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: 36px 24px; text-align: center; transition: var(--transition); position: relative; overflow: hidden;
}
.stat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--color-stat-before);
  opacity: 0; transition: var(--transition);
}
.stat-card:hover::before { opacity: 1; }
.stat-card:hover { border-color: var(--color-border-strong); transform: translateY(-4px); }
.stat-number {
  font-size: 2.8rem; font-weight: 900; font-family: var(--font-mono);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  line-height: 1.1;
  -webkit-text-stroke: 0.5px transparent;
}
.stat-label { font-size: 0.88rem; color: var(--color-text-secondary); margin-top: 10px; }

/* ===== Cards Grid ===== */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px; }
.card {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 36px 28px; transition: var(--transition); position: relative; overflow: hidden;
}
.card::after {
  content: ''; position: absolute; top: 0; right: 0; width: 120px; height: 120px;
  background: radial-gradient(circle, rgba(59,130,246,0.04) 0%, transparent 70%);
  border-radius: 50%; transform: translate(40%, -40%);
}
.card:hover { border-color: var(--color-border-strong); transform: translateY(-6px); box-shadow: var(--shadow-glow); }
.card-icon {
  width: 50px; height: 50px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
  margin-bottom: 22px; position: relative; z-index: 1;
}
.card-icon.blue { background: rgba(59,130,246,0.12); color: var(--color-primary); }
.card-icon.cyan { background: rgba(6,182,212,0.12); color: var(--color-accent); }
.card-icon.green { background: rgba(16,185,129,0.12); color: var(--color-success); }
.card-icon.purple { background: rgba(124,58,237,0.12); color: #7c3aed; }
.card h3 { font-size: 1.1rem; font-weight: 700; color: var(--color-white); margin-bottom: 10px; position: relative; z-index: 1; }
.card p { font-size: 0.9rem; color: var(--color-text-secondary); line-height: 1.7; position: relative; z-index: 1; }

/* ===== Platform Tags ===== */
.platforms { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
.platform-tag {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: 100px;
  padding: 11px 24px; font-size: 0.9rem; font-weight: 600; color: var(--color-text);
  transition: var(--transition);
}
.platform-tag:hover { border-color: var(--color-primary); color: var(--color-primary); box-shadow: 0 0 20px rgba(59,130,246,0.1); }

/* ===== Timeline / Process ===== */
.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.process::before { content: ''; position: absolute; top: 40px; left: 12.5%; right: 12.5%; height: 2px; background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); z-index: 0; }
.process-step { text-align: center; position: relative; z-index: 1; padding: 0 12px; }
.process-num {
  width: 52px; height: 52px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; font-weight: 700; margin: 0 auto 18px;
  box-shadow: 0 0 24px rgba(59,130,246,0.3);
}
.process-step h4 { font-size: 1rem; font-weight: 700; color: var(--color-white); margin-bottom: 8px; }
.process-step p { font-size: 0.83rem; color: var(--color-text-secondary); }

/* ===== Pricing ===== */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: start; }
.price-card {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 44px 32px; text-align: center; transition: var(--transition); position: relative;
}
.price-card.featured {
  border-color: var(--color-primary);
  background: linear-gradient(160deg, rgba(59,130,246,0.08), var(--color-surface));
  box-shadow: 0 0 40px rgba(59,130,246,0.08);
  transform: scale(1.04);
}
.price-card.featured:hover { transform: scale(1.04) translateY(-4px); }
.price-card:hover { border-color: var(--color-border-strong); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.price-badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff; padding: 5px 18px; border-radius: 100px; font-size: 0.75rem; font-weight: 600;
  white-space: nowrap; box-shadow: 0 4px 16px var(--color-primary-glow);
}
.price-name { font-size: 1.25rem; font-weight: 700; color: var(--color-white); margin-bottom: 18px; }
.price-amount {
  font-size: 2.8rem; font-weight: 800; font-family: var(--font-mono);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.price-amount small { font-size: 0.85rem; font-weight: 500; color: var(--color-text-secondary); }
.price-features { list-style: none; margin: 28px 0; text-align: left; }
.price-features li {
  padding: 9px 0; font-size: 0.88rem; color: var(--color-text-secondary);
  display: flex; align-items: center; gap: 10px; border-bottom: 1px solid rgba(255,255,255,0.03);
}
.price-features li::before { content: '✓'; color: var(--color-accent); font-weight: 700; }
.price-card .btn { width: 100%; justify-content: center; }

/* ===== Case Grid ===== */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 22px; }
.case-card {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  overflow: hidden; transition: var(--transition);
}
.case-card:hover { border-color: var(--color-border-strong); box-shadow: var(--shadow-glow); transform: translateY(-4px); }
.case-card-header { padding: 28px 28px 0; }
.case-tag {
  display: inline-block; font-size: 0.72rem; font-weight: 600; color: var(--color-accent);
  background: rgba(6,182,212,0.1); padding: 4px 10px; border-radius: 4px; margin-bottom: 12px;
  border: 1px solid rgba(6,182,212,0.15);
}
.case-card h3 { font-size: 1.08rem; font-weight: 700; color: var(--color-white); margin-bottom: 8px; }
.case-card .case-meta { font-size: 0.82rem; color: var(--color-text-muted); margin-bottom: 16px; }
.case-card .case-body { padding: 0 28px 28px; }
.case-result { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.case-result-item {
  background: rgba(59,130,246,0.04); border: 1px solid var(--color-border);
  padding: 14px; border-radius: var(--radius-sm);
}
.case-result-item .val { font-size: 1.25rem; font-weight: 700; font-family: var(--font-mono); color: var(--color-primary); }
.case-result-item .lbl { font-size: 0.72rem; color: var(--color-text-muted); }

/* ===== Academic Section ===== */
.paper-ref {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: 32px;
}
.paper-ref h3 {
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--color-text-muted);
  font-weight: 500; margin-bottom: 12px;
}
.paper-ref .paper-title {
  font-size: 1.2rem; font-weight: 700; color: var(--color-white); line-height: 1.5; margin-bottom: 8px;
}
.paper-ref .paper-authors { font-size: 0.9rem; color: var(--color-text-secondary); }
.paper-ref .paper-venue { font-size: 0.8rem; color: var(--color-accent); margin-top: 8px; font-weight: 500; }

/* ===== Metric Display ===== */
.metric-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; }
.metric-box {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: 24px 20px; text-align: center; transition: var(--transition);
}
.metric-box:hover { border-color: var(--color-border-strong); }
.metric-box .metric-name { font-size: 0.75rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; }
.metric-box .metric-val { font-size: 1.8rem; font-weight: 800; font-family: var(--font-mono); color: var(--color-white); }
.metric-box .metric-delta { font-size: 0.8rem; color: var(--color-accent); font-weight: 600; margin-top: 4px; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-item {
  display: flex; gap: 16px; margin-bottom: 22px; align-items: flex-start;
}
.contact-item-icon {
  width: 46px; height: 46px; border-radius: var(--radius-sm);
  background: rgba(59,130,246,0.08); border: 1px solid var(--color-border);
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-item h4 { font-size: 0.88rem; font-weight: 600; color: var(--color-white); margin-bottom: 3px; }
.contact-item p { font-size: 0.85rem; color: var(--color-text-secondary); }
.contact-form {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 36px; box-shadow: var(--shadow-card);
}
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.82rem; font-weight: 600; color: var(--color-text-secondary); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 16px;
  background: var(--color-input-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); color: var(--color-text); font-size: 0.9rem;
  font-family: inherit; transition: var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-submit { width: 100%; }

/* ===== Footer ===== */
.footer {
  background: var(--color-footer-bg); border-top: 1px solid var(--color-footer-border);
  padding: 64px 0 32px; position: relative; z-index: 1;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer h4 { font-size: 0.88rem; font-weight: 700; color: var(--color-white); margin-bottom: 16px; }
.footer p, .footer a {
  font-size: 0.84rem; color: var(--color-text-muted); text-decoration: none;
  line-height: 2.2; display: block; transition: var(--transition);
}
.footer a:hover { color: var(--color-white); }
.footer-bottom {
  border-top: 1px solid var(--color-border); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.78rem; color: var(--color-text-muted); flex-wrap: wrap; gap: 12px;
}

/* ===== Scroll Animations ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Section with gradient top ===== */
.section-hero {
  padding: 120px 0 80px; text-align: center;
  background: var(--section-hero-bg);
}

/* ===== Join Benefits ===== */
.benefit-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.benefit-card {
  padding: 40px 28px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.benefit-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  opacity: 0.8;
  transition: opacity var(--transition);
}
.benefit-card:hover::before {
  opacity: 1;
}
/* Colorful alternating styles for benefit cards */
.benefit-card:nth-child(1) { background: linear-gradient(160deg, rgba(59,130,246,0.15), var(--color-surface)); }
.benefit-card:nth-child(1)::before { background: linear-gradient(90deg, #2563eb, #60a5fa); }
.benefit-card:nth-child(1) .benefit-num { color: rgba(37, 99, 235, 0.25); }
.benefit-card:nth-child(1) h3 { color: #2563eb; }
.benefit-card:nth-child(1) p { color: var(--color-text); }

.benefit-card:nth-child(2) { background: linear-gradient(160deg, rgba(6,182,212,0.15), var(--color-surface)); }
.benefit-card:nth-child(2)::before { background: linear-gradient(90deg, #0891b2, #22d3ee); }
.benefit-card:nth-child(2) .benefit-num { color: rgba(8, 145, 178, 0.25); }
.benefit-card:nth-child(2) h3 { color: #0891b2; }
.benefit-card:nth-child(2) p { color: var(--color-text); }

.benefit-card:nth-child(3) { background: linear-gradient(160deg, rgba(16,185,129,0.15), var(--color-surface)); }
.benefit-card:nth-child(3)::before { background: linear-gradient(90deg, #059669, #34d399); }
.benefit-card:nth-child(3) .benefit-num { color: rgba(5, 150, 105, 0.25); }
.benefit-card:nth-child(3) h3 { color: #059669; }
.benefit-card:nth-child(3) p { color: var(--color-text); }

.benefit-card:nth-child(4) { background: linear-gradient(160deg, rgba(245,158,11,0.15), var(--color-surface)); }
.benefit-card:nth-child(4)::before { background: linear-gradient(90deg, #d97706, #fbbf24); }
.benefit-card:nth-child(4) .benefit-num { color: rgba(217, 119, 6, 0.25); }
.benefit-card:nth-child(4) h3 { color: #d97706; }
.benefit-card:nth-child(4) p { color: var(--color-text); }

.benefit-card:nth-child(5) { background: linear-gradient(160deg, rgba(139,92,246,0.15), var(--color-surface)); }
.benefit-card:nth-child(5)::before { background: linear-gradient(90deg, #7c3aed, #a78bfa); }
.benefit-card:nth-child(5) .benefit-num { color: rgba(124, 58, 237, 0.25); }
.benefit-card:nth-child(5) h3 { color: #7c3aed; }
.benefit-card:nth-child(5) p { color: var(--color-text); }

.benefit-card:nth-child(6) { background: linear-gradient(160deg, rgba(239,68,68,0.15), var(--color-surface)); }
.benefit-card:nth-child(6)::before { background: linear-gradient(90deg, #dc2626, #f87171); }
.benefit-card:nth-child(6) .benefit-num { color: rgba(220, 38, 38, 0.25); }
.benefit-card:nth-child(6) h3 { color: #dc2626; }
.benefit-card:nth-child(6) p { color: var(--color-text); }
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: 32px 24px; text-align: center; transition: var(--transition);
}
.benefit-card:hover { border-color: var(--color-border-strong); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.benefit-num { font-size: 2.5rem; font-weight: 800; color: var(--color-benefit-num); line-height: 1; margin-bottom: 12px; }
.benefit-card h3 { font-size: 1.08rem; font-weight: 700; color: var(--color-white); margin-bottom: 8px; }
.benefit-card p { font-size: 0.85rem; color: var(--color-text-secondary); }

/* ===== About section with grid ===== */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
}
.about-academic {
  background: linear-gradient(160deg, rgba(59,130,246,0.08), rgba(6,182,212,0.06));
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 48px; text-align: center;
}
.about-icon { font-size: 3.5rem; margin-bottom: 16px; }
.about-content .tag { margin-bottom: 20px; }
.about-content h2 {
  font-size: 1.8rem; font-weight: 700; color: var(--color-white); margin-bottom: 18px;
}
.about-content p {
  color: var(--color-text-secondary); margin-bottom: 14px; line-height: 1.8;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 100px 0; text-align: center;
  background: var(--cta-bg);
}
.cta-section h2 { font-size: 2rem; font-weight: 800; color: var(--color-white); margin-bottom: 16px; }
.cta-section p { font-size: 1.05rem; color: var(--color-text-secondary); margin-bottom: 36px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* ====== Geo page banner ====== */
.geo-page-banner {
  padding: 120px 0 80px; text-align: center;
  background: var(--section-hero-bg);
}

/* ===== Page Content (for CMS page content) ===== */
.geo-page-content {
  background: linear-gradient(160deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 40px;
}
.geo-page-content h1, .geo-page-content h2, .geo-page-content h3 {
  color: var(--color-white);
}
.geo-page-content p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

/* ====== Page inner section ====== */
.page-inner-section {
  padding: 100px 0;
  position: relative;
}
.page-inner-section:last-child {
  padding-bottom: 100px;
}

/* ====== Page inner with bg ====== */
.page-section-bg {
  background: var(--section-bg-gradient);
}

/* ====== Nav active state compat ====== */
.page-about .nav-links a[href*="about"],
.page-service .nav-links a[href*="service"],
.page-cases .nav-links a[href*="case"],
.page-join .nav-links a[href*="join"],
.page-contact .nav-links a[href*="contact"],
.page-index .nav-links a[href*="home"],
.page-index .nav-links a[href="/"] { 
  color: var(--color-white); 
  background: rgba(59,130,246,0.1); 
}

/* ===== Article List (News) ===== */
.article-list { list-style: none; }
.article-list li {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}
.article-list li:last-child { border-bottom: none; }
.article-list a {
  color: var(--color-white);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  transition: var(--transition);
}
.article-list a:hover { color: var(--color-primary); }
.article-list .article-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ===== News grid ===== */
.news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 22px; }

/* ===== Responsive ===== */

/* Tablet landscape / small desktop: 992-1200px */
@media (max-width: 1100px) {
  .hero .container { gap: 40px; }
  .hero h1 { font-size: 2.2rem; }
  .about-grid { grid-template-columns: 1fr !important; gap: 40px; }
  .about-academic { padding: 36px; }
}

/* Tablet: 769-1024px */
@media (max-width: 1024px) {
  .container { max-width: 100%; }
  .page-section, .page-inner-section { padding: 70px 0; }
  .section-hero, .geo-page-banner { padding: 90px 0 60px; }
  .hero { min-height: auto; padding: 100px 0 60px; }
  .hero .container { grid-template-columns: 1fr; gap: 48px; }
  .hero-dash { max-width: 500px; margin: 0 auto; }
  .hero p { max-width: 100%; }
  .pricing { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .price-card { padding: 32px 20px; }
  .price-card.featured { transform: scale(1.02); }
  .price-card.featured:hover { transform: scale(1.02) translateY(-4px); }
  .price-amount { font-size: 2.2rem; }
  .price-features li { font-size: 0.8rem; }
  .cards { gap: 16px; }
  .card { padding: 28px 22px; }
  .case-grid { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
  .contact-grid { gap: 36px; }
  .footer-grid { gap: 28px; }
  .stats-grid { gap: 14px; }
  .stat-card { padding: 28px 16px; }
  .stat-number { font-size: 2.2rem; }
}

/* Tablet portrait / large phones: 600-768px */
@media (max-width: 768px) {
  .page-section, .page-inner-section { padding: 56px 0; }
  .section-hero, .geo-page-banner { padding: 80px 0 48px; }
  .hero { padding: 90px 0 48px; }
  .container { padding: 0 20px; }

  .cta-section { padding: 60px 0 !important; }
  .cta-section h2 { font-size: 1.4rem !important; }
  .cta-section p { font-size: 0.9rem !important; }

  .nav-links {
    display: none; position: fixed; top: 70px; left: 0; right: 0;
    background: var(--color-nav-bg); backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column; padding: 12px 20px;
    border-bottom: 1px solid var(--color-border); gap: 2px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; font-size: 0.9rem; border-radius: var(--radius-sm); }
  .menu-toggle { display: block; }
  .nav-logo { font-size: 1.05rem; }
  .nav-logo-icon { width: 32px; height: 32px; font-size: 0.85rem; }
  .theme-toggle { padding: 4px 8px; font-size: 1rem; }

  .section-title { font-size: 1.6rem; }
  .hero h1 { font-size: 1.85rem; }
  .hero p { font-size: 0.95rem; }
  .section-subtitle { font-size: 0.9rem; }

  .hero .container { gap: 36px; }
  .hero-buttons { gap: 10px; }
  .hero-dash { padding: 20px; }
  .hero-dash-header { margin-bottom: 14px; }
  .hero-metric-row { gap: 8px; }
  .hero-metric { padding: 12px 10px; }
  .hero-metric .val { font-size: 1.3rem; }
  .hero-bar { padding: 10px 12px; }
  .hero-bar-label { font-size: 0.7rem; }
  .hero-bar-val { font-size: 0.7rem; width: 38px; }
  .hero-bar-track { margin: 0 8px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat-card { padding: 24px 14px; }
  .stat-number { font-size: 2rem; }
  .stat-label { font-size: 0.78rem; }

  .cards { grid-template-columns: 1fr; max-width: 480px; margin-left: auto; margin-right: auto; }
  .card { padding: 28px 22px; }
  .card-icon { width: 44px; height: 44px; font-size: 1.2rem; margin-bottom: 16px; }

  .process { grid-template-columns: 1fr 1fr; gap: 24px; }
  .process::before { display: none; }
  .process-num { width: 44px; height: 44px; font-size: 1rem; }

  .pricing { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; gap: 20px; }
  .price-card.featured { transform: none; }
  .price-card.featured:hover { transform: translateY(-4px); }

  .case-grid { grid-template-columns: 1fr; max-width: 500px; margin-left: auto; margin-right: auto; }
  .case-card-header { padding: 22px 22px 0; }
  .case-card .case-body { padding: 0 22px 22px; }

  .metric-row { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .metric-box { padding: 18px 14px; }
  .metric-box .metric-val { font-size: 1.4rem; }

  .about-academic { padding: 28px; }
  .about-grid { gap: 32px !important; }
  .about-content h2 { font-size: 1.4rem; }

  .benefit-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .benefit-card { padding: 24px 18px; }

  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .contact-form { padding: 28px; }

  .footer { padding: 48px 0 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }

  .platforms { gap: 10px; }
  .platform-tag { padding: 8px 16px; font-size: 0.8rem; }

  .bg-orb-1 { width: 300px; height: 300px; top: -100px; left: -50px; }
  .bg-orb-2 { width: 250px; height: 250px; right: -80px; }
  .bg-orb-3 { width: 200px; height: 200px; }
  
  .news-grid { grid-template-columns: 1fr; }
  .geo-page-content { padding: 24px; }
}

/* Small phones: 375-599px */
@media (max-width: 599px) {
  .hero h1 { font-size: 1.6rem; }
  .section-title { font-size: 1.4rem; }
  .hero-dash { padding: 16px; }
  .hero-metric-row { grid-template-columns: 1fr 1fr 1fr; gap: 6px; }
  .hero-metric { padding: 10px 6px; }
  .hero-metric .val { font-size: 1.1rem; }
  .hero-metric .lbl { font-size: 0.65rem; }
  /*.hero-bar-label { display: none; }*/
  .hero-bar { padding: 8px 10px; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { justify-content: center; font-size: 0.88rem; padding: 13px 24px; }
  .process { grid-template-columns: 1fr; gap: 18px; }
  .metric-row { grid-template-columns: 1fr 1fr; }
  .benefit-grid { grid-template-columns: 1fr; }
  .case-result { grid-template-columns: 1fr 1fr; }
}

/* Very small phones: <375px */
@media (max-width: 480px) {
  .hero { padding: 80px 0 40px; }
  .hero h1 { font-size: 1.45rem; }
  .stats-grid { grid-template-columns: 1fr; gap: 10px; }
  .stat-card { padding: 20px 14px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .btn { padding: 12px 22px; font-size: 0.85rem; }
  .contact-form { padding: 22px; }
  .price-card { padding: 28px 20px; }
  .hero-dash { padding: 12px; }
  .hero-metric-row { grid-template-columns: 1fr 1fr 1fr; gap: 4px; }
  .hero-metric .val { font-size: 1rem; }
  .case-result { grid-template-columns: 1fr; }
  .section-hero, .geo-page-banner { padding: 70px 0 40px; }
  .cta-section { padding: 50px 0 !important; }
  .cta-section h2 { font-size: 1.2rem !important; }
  .platforms { gap: 6px; }
  .platform-tag { padding: 6px 12px; font-size: 0.75rem; }
  .nav-logo { font-size: 0.95rem; gap: 8px; }
  .nav-logo-icon { width: 28px; height: 28px; font-size: 0.75rem; }
  .form-group input, .form-group select, .form-group textarea { padding: 10px 14px; font-size: 0.85rem; }
  .form-group label { font-size: 0.78rem; }
  .cta-section { padding: 60px 0 !important; }
  .cta-section h2 { font-size: 1.3rem !important; }
  .about-academic { padding: 20px; }
}