/* ============================================================
   云合智推 YunHe GEO — Design System
   Tiffany-teal + Deep-navy + Highlight-yellow
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root {
  --white: #FFFFFF;
  --off-white: #F8F9FA;
  --light-bg: #F0F2F5;
  --border: #E5E7EB;
  --text-primary: #1A1A2E;
  --text-secondary: #4A5568;
  --text-muted: #9CA3AF;
  --dark: #1A1A2E;
  --darker: #0D0D1A;
  --darkest: #060610;
  --accent: #0ABAB5;
  --accent-dark: #089E9A;
  --accent-light: rgba(10, 186, 181, 0.08);
  --accent-glow: rgba(10, 186, 181, 0.25);
  --accent-border: rgba(10, 186, 181, 0.2);
  --highlight: #FFD932;
  --highlight-light: rgba(255, 217, 50, 0.1);
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --section-pad: clamp(4rem, 8vh, 6rem);
  --container-max: 1200px;
  --container-pad: clamp(1.5rem, 4vw, 3rem);
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 300ms;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; font-size: 18px; }
body { font-family: var(--font-sans); color: var(--text-primary); background: var(--white); line-height: 1.7; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color var(--duration) var(--ease); }
ul, ol { list-style: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-pad); }

h1, h2, h3, h4, h5, h6 { line-height: 1.2; font-weight: 700; letter-spacing: -0.02em; }

.section-label { display: flex; align-items: center; justify-content: center; gap: 0.75rem; font-size: 0.9rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.2em; color: var(--accent); margin-bottom: 1.25rem; width: 100%; text-align: center; }
.section-label::before, .section-label::after { content: ''; width: 2rem; height: 2px; background: var(--accent); flex-shrink: 0; }
.section-title { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 1.25rem; color: var(--text-primary); text-align: center; }
.section-subtitle { font-size: clamp(1rem, 1.5vw, 1.15rem); color: var(--text-secondary); max-width: 800px; line-height: 1.8; text-align: center; margin-left: auto; margin-right: auto; text-wrap: balance; word-break: keep-all; }
.accent-text { color: var(--accent); }
.highlight-text { color: var(--highlight); }

/* ===== Scroll reveal ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ===== NAV ===== */
.site-nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; padding: 1rem 0; transition: all 0.4s var(--ease); }
.site-nav.scrolled { background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); box-shadow: 0 1px 0 var(--border); padding: 0.65rem 0; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-pad); position: relative; }
.nav-logo { display: flex; align-items: center; gap: 0.6rem; z-index: 1001; flex-shrink: 0; margin-right: 1rem; }
.nav-logo img { height: 44px; width: auto; transition: all var(--duration) var(--ease); }
.site-nav.scrolled .nav-logo img { height: 38px; }
.nav-links { display: flex; align-items: center; gap: 1.25rem; }
.nav-links a { font-size: 0.875rem; font-weight: 500; color: var(--text-secondary); padding: 0.25rem 0; position: relative; white-space: nowrap; }
.nav-links a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--accent); transition: width var(--duration); }
.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 0.5rem; }
.nav-phone { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-right: 0.8rem; transition: all var(--duration); white-space: nowrap; }
.nav-phone:hover { color: var(--accent); transform: translateY(-1px); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; z-index: 1002; padding: 0.5rem; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text-primary); transition: all var(--duration); }

/* ===== Buttons ===== */
.btn-primary { display: inline-flex; align-items: center; gap: 0.6rem; padding: 0.6rem 1.4rem; background: var(--accent); color: var(--white); font-size: 0.875rem; font-weight: 600; border-radius: var(--radius-full); transition: all var(--duration); white-space: nowrap; }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); box-shadow: 0 4px 12px var(--accent-glow); }
.btn-accent { display: inline-flex; align-items: center; gap: 0.75rem; padding: 1rem 1rem 1rem 2rem; background: var(--highlight); color: var(--text-primary); font-size: 1rem; font-weight: 600; border-radius: var(--radius-full); transition: all var(--duration); box-shadow: 0 4px 20px rgba(255, 217, 50, 0.3); white-space: nowrap; }
.btn-accent .arrow { display: inline-flex; align-items: center; justify-content: center; width: 2.5rem; height: 2.5rem; background: var(--text-primary); color: var(--highlight); border-radius: 50%; font-size: 1.1rem; transition: all var(--duration); }
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255, 217, 50, 0.4); }
.btn-accent:hover .arrow { transform: translateX(3px); }
.btn-outline { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.85rem 1.75rem; background: transparent; color: var(--accent-dark); font-size: 0.9rem; font-weight: 600; border: 1.5px solid var(--accent); border-radius: var(--radius-full); transition: all var(--duration); white-space: nowrap; }
.btn-outline:hover { background: var(--accent); color: var(--white); box-shadow: 0 4px 12px var(--accent-glow); }

/* ===== HERO ===== */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; overflow: hidden; background: var(--off-white); }
.hero-bg { position: absolute; inset: 0; background: radial-gradient(ellipse 800px 600px at 20% 50%, rgba(10, 186, 181, 0.06), transparent), radial-gradient(ellipse 600px 400px at 80% 30%, rgba(10, 186, 181, 0.04), transparent), radial-gradient(ellipse 1200px 600px at 50% 120%, rgba(255, 217, 50, 0.06), transparent); animation: heroFloat 20s ease-in-out infinite alternate; }
@keyframes heroFloat { 0% { transform: scale(1); } 100% { transform: scale(1.05) translate(-1%, 1%); } }
.hero-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(0, 0, 0, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 0, 0, 0.04) 1px, transparent 1px); background-size: 60px 60px; mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.8) 0%, transparent 70%); -webkit-mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.8) 0%, transparent 70%); }
.hero-content { position: relative; z-index: 2; padding: 0 var(--container-pad); max-width: 900px; }
.hero-eyebrow { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.8rem; font-weight: 600; color: var(--accent-dark); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 2rem; padding: 0.4rem 1.2rem; border: 1px solid rgba(10, 186, 181, 0.15); border-radius: var(--radius-full); background: rgba(10, 186, 181, 0.05); }
.hero-title { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800; color: var(--text-primary); letter-spacing: -0.03em; line-height: 1.1; margin-bottom: 1.5rem; }
.hero-tagline { font-size: clamp(1.05rem, 2vw, 1.35rem); color: var(--text-secondary); max-width: 600px; margin: 0 auto 1rem; line-height: 1.7; font-weight: 500; }
.hero-tagline .hl { color: var(--accent); font-weight: 700; display: inline-block; transition: opacity 0.4s, transform 0.4s; }
.hero-tagline .hl.fade-out { opacity: 0; transform: translateY(-8px); }
.hero-sub { font-size: 0.85rem; color: var(--accent-dark); letter-spacing: 0.08em; text-transform: uppercase; font-weight: 700; margin-bottom: 2.5rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-scroll { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 0.5rem; z-index: 2; }
.hero-scroll span { font-size: 0.7rem; font-weight: 600; letter-spacing: 0.2em; text-transform: uppercase; color: var(--text-muted); }
.scroll-line { width: 1px; height: 40px; background: linear-gradient(to bottom, var(--accent), transparent); animation: scrollPulse 2s ease-in-out infinite; }
@keyframes scrollPulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

/* ===== SECTIONS ===== */
.section { padding: var(--section-pad) 0; position: relative; }
.section-dark { background: var(--dark); color: var(--white); }
.section-dark .section-label { color: var(--highlight); }
.section-dark .section-label::before, .section-dark .section-label::after { background: var(--highlight); }
.section-dark .section-title { color: var(--white); }
.section-dark .section-subtitle { color: rgba(255, 255, 255, 0.6); }
.section-light { background: var(--off-white); }
.section-accent-bg { background: linear-gradient(180deg, var(--white) 0%, rgba(10, 186, 181, 0.03) 100%); }
.hide-on-mobile { display: inline; }

/* ===== VISION ===== */
.vision-section { background: var(--off-white); overflow: hidden; }
.vision-grid { display: grid; grid-template-columns: 1fr auto 1fr; gap: 2rem; align-items: center; margin-top: 3rem; }
.vision-card { padding: 2.5rem; border-radius: var(--radius-xl); border: 1px solid var(--border); transition: all 0.4s var(--ease); position: relative; background: var(--white); }
.vision-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.vision-card.next-gen { border-color: var(--accent); background: linear-gradient(135deg, rgba(10, 186, 181, 0.03), rgba(10, 186, 181, 0.08)); }
.vision-badge { position: absolute; top: -0.75rem; right: 1.5rem; padding: 0.3rem 0.9rem; background: var(--accent); color: var(--white); font-size: 0.65rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; border-radius: var(--radius-full); }
.vision-icon { width: 4rem; height: 4rem; margin: 0 auto 1.25rem; display: flex; align-items: center; justify-content: center; border-radius: var(--radius-lg); }
.vision-card:not(.next-gen) .vision-icon { background: var(--light-bg); color: var(--text-muted); }
.vision-card.next-gen .vision-icon { background: var(--accent-light); color: var(--accent); }
.vision-card h3 { font-size: 1.5rem; font-weight: 800; text-align: center; margin-bottom: 0.5rem; }
.vision-en { font-size: 0.78rem; color: var(--text-muted); text-align: center; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 1rem; }
.vision-card p { text-align: center; color: var(--text-secondary); font-size: 0.95rem; }
.vision-core { justify-content: center; margin-top: 1.25rem; padding: 0.5rem 1rem; background: var(--light-bg); border-radius: var(--radius-full); font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); }
.vision-card.next-gen .vision-core { background: var(--accent-light); color: var(--accent-dark); }
.vision-arrow { display: flex; flex-direction: column; align-items: center; gap: 0.3rem; color: var(--accent); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.15em; }
.vision-arrow svg { width: 40px; height: 40px; animation: arrowNudge 1.6s ease-in-out infinite; }
@keyframes arrowNudge { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(6px); } }
.vision-strategy { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 2.5rem; }
.strategy-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.75rem 1.5rem; transition: all 0.35s var(--ease); }
.strategy-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--accent-border); }
.strategy-num { font-size: 0.9rem; font-weight: 800; color: var(--accent); margin-bottom: 0.6rem; letter-spacing: 0.1em; }
.strategy-card h4 { font-size: 1.05rem; margin-bottom: 0.5rem; }
.strategy-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; }

/* ===== STATS ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 3rem; }
.stat-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 2rem 1.5rem; text-align: center; transition: all 0.35s var(--ease); }
.stat-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--accent-border); }
.stat-value-row { display: flex; align-items: baseline; justify-content: center; gap: 0.2rem; }
.stat-number { font-size: clamp(2.2rem, 4vw, 3rem); font-weight: 800; color: var(--accent); line-height: 1; }
.stat-suffix { font-size: 1.2rem; font-weight: 700; color: var(--accent); }
.stat-unit { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-top: 0.75rem; }
.stat-label { font-size: 0.82rem; color: var(--text-muted); margin-top: 0.3rem; }
.stat-source-note { font-size: 0.72rem; color: var(--text-muted); max-width: 900px; margin: 2rem auto 0; line-height: 1.7; text-align: center; }
.insight-banner { max-width: 900px; margin: 2rem auto 0; text-align: center; padding: 1.3rem 1.5rem; background: rgba(10, 186, 181, 0.06); border: 1px solid rgba(10, 186, 181, 0.2); border-radius: 14px; }

/* ===== GEO cards ===== */
.geo-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 3rem; }
.geo-card { position: relative; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 2.25rem 1.75rem; transition: all 0.4s var(--ease); overflow: hidden; }
.geo-card::after { content: attr(data-num); position: absolute; top: 1rem; right: 1.25rem; font-size: 2.2rem; font-weight: 900; color: rgba(10, 186, 181, 0.08); line-height: 1; }
.geo-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--accent-border); }
.geo-icon { width: 3rem; height: 3rem; display: flex; align-items: center; justify-content: center; background: var(--accent-light); color: var(--accent); border-radius: var(--radius-md); margin-bottom: 1.25rem; }
.geo-card h3 { font-size: 1.15rem; margin-bottom: 0.6rem; }
.geo-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.75; }

/* ===== Iceberg ===== */
.iceberg-section { background: linear-gradient(180deg, var(--off-white) 0%, #E8F7F7 45%, #0E2A3D 55%, var(--darkest) 100%); padding: var(--section-pad) 0; overflow: hidden; }
.iceberg-container { max-width: 880px; margin: 2.5rem auto 0; }
.iceberg-peak { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-xl) var(--radius-xl) 0 0; padding: 2.5rem; text-align: center; box-shadow: var(--shadow-md); }
.iceberg-peak-label { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.15em; color: var(--accent-dark); }
.iceberg-peak h3 { font-size: 1.5rem; margin: 0.75rem 0 0.6rem; }
.iceberg-peak p { font-size: 0.92rem; color: var(--text-secondary); max-width: 620px; margin: 0 auto; }
.iceberg-peak-stats { display: flex; justify-content: center; gap: 2.5rem; margin-top: 1.75rem; flex-wrap: wrap; }
.iceberg-peak-stat .val { font-size: 1.4rem; font-weight: 800; color: var(--accent); }
.iceberg-peak-stat .lbl { font-size: 0.75rem; color: var(--text-muted); }
.water-surface { height: 4px; background: linear-gradient(90deg, transparent, var(--accent), transparent); animation: waterShimmer 3s ease-in-out infinite; }
@keyframes waterShimmer { 0%, 100% { opacity: 0.5; } 50% { opacity: 1; } }
.water-labels { display: flex; justify-content: space-between; font-size: 0.62rem; font-weight: 700; letter-spacing: 0.2em; color: rgba(255, 255, 255, 0.45); padding: 0.4rem 0.5rem; }
.iceberg-depth { background: rgba(13, 13, 26, 0.85); backdrop-filter: blur(8px); border: 1px solid rgba(10, 186, 181, 0.25); border-top: none; border-radius: 0 0 var(--radius-xl) var(--radius-xl); padding: 2.5rem; text-align: center; color: var(--white); }
.iceberg-depth-label { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.15em; color: var(--accent); }
.iceberg-depth h3 { font-size: 1.5rem; margin: 0.75rem 0 0.6rem; color: var(--white); }
.iceberg-depth > p { font-size: 0.92rem; color: rgba(255, 255, 255, 0.65); max-width: 640px; margin: 0 auto; }
.iceberg-depth-features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; margin-top: 2rem; text-align: left; }
.iceberg-feature { display: flex; gap: 0.9rem; align-items: flex-start; background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.08); border-radius: var(--radius-md); padding: 1.1rem 1.2rem; transition: all 0.3s var(--ease); }
.iceberg-feature:hover { border-color: var(--accent-border); background: rgba(10, 186, 181, 0.06); }
.iceberg-feature-icon { width: 2rem; height: 2rem; flex-shrink: 0; color: var(--accent); }
.iceberg-feature-text { font-size: 0.82rem; color: rgba(255, 255, 255, 0.6); line-height: 1.6; }
.iceberg-feature-text strong { display: block; color: var(--white); font-size: 0.92rem; margin-bottom: 0.2rem; }

/* ===== Technology ===== */
.tech-section { background: #fafafa; }
.tech-cap-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 3rem; }
.tech-cap-card { background: var(--white); border-radius: 16px; padding: 2rem 1.5rem; border: 1px solid rgba(0, 0, 0, 0.05); text-align: center; transition: transform 0.3s, box-shadow 0.3s; }
.tech-cap-card:hover { transform: translateY(-6px); box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06); }
.tech-cap-icon { width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 1.25rem; }
.tech-cap-card h4 { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.5rem; }
.tech-cap-card p { font-size: 0.85rem; color: #6b7280; line-height: 1.6; }
.tech-agent-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.tech-agent-card { background: #0b0f19; border-radius: 14px; padding: 1.75rem 1.25rem; text-align: center; border: 1px solid rgba(255, 255, 255, 0.05); transition: all 0.3s; }
.tech-agent-card:hover { transform: translateY(-4px); }
.tech-agent-icon { width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 0.75rem; }
.tech-agent-card .ta-name { font-size: 1rem; font-weight: 700; color: #fff; }
.tech-agent-card .ta-cn { font-size: 0.75rem; color: rgba(255, 255, 255, 0.4); margin-top: 0.25rem; }
.tech-agent-card .ta-desc { font-size: 0.78rem; color: rgba(255, 255, 255, 0.5); margin-top: 0.75rem; line-height: 1.5; }

/* ===== Service tiers ===== */
.tiers-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; text-align: left; }
.tier-card { border-radius: 18px; padding: 2rem 1.6rem; display: flex; flex-direction: column; transition: all 0.35s var(--ease); }
.tier-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.tier-card.tier-lite { border: 2px solid var(--accent); background: linear-gradient(180deg, rgba(10, 186, 181, 0.05), #fff); }
.tier-card.tier-std { border: 1px solid rgba(17, 24, 39, 0.12); background: #fff; }
.tier-card.tier-ultra { border: 1px solid rgba(255, 214, 102, 0.4); background: linear-gradient(180deg, #1A1A2E, #23234a); color: #fff; }
.tier-eyebrow { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.05em; }
.tier-card h3 { font-size: 1.35rem; margin: 0.5rem 0 0.15rem; }
.tier-en { color: #9ca3af; font-size: 0.85rem; margin: 0 0 1rem; }
.tier-desc { font-size: 0.95rem; line-height: 1.75; margin: 0 0 1.1rem; flex-grow: 1; }
.tier-price { font-size: 1.6rem; font-weight: 800; }
.tier-note { font-size: 0.82rem; margin: 0.25rem 0 1.1rem; }
.tier-btn { display: inline-block; font-weight: 700; padding: 0.65rem 1.4rem; border-radius: var(--radius-full); text-align: center; transition: all var(--duration); }
.tier-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* ===== Services 5-step ===== */
.services-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1.25rem; margin-top: 3rem; }
.service-card { position: relative; background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius-lg); padding: 2rem 1.5rem; transition: all 0.4s var(--ease); cursor: default; }
.service-card:hover { background: rgba(10, 186, 181, 0.08); border-color: var(--accent); transform: translateY(-6px); }
.service-num { font-size: 1.8rem; font-weight: 900; color: var(--accent); opacity: 0.5; margin-bottom: 1rem; }
.service-card h3 { font-size: 1.05rem; color: var(--white); margin-bottom: 0.6rem; }
.service-card p { font-size: 0.82rem; color: rgba(255, 255, 255, 0.55); line-height: 1.7; }
.card-arrow { position: absolute; bottom: 1.25rem; right: 1.5rem; color: var(--accent); opacity: 0; transition: all var(--duration); }
.service-card:hover .card-arrow { opacity: 1; transform: translateX(3px); }

/* ===== Platforms ===== */
.platform-group { margin-top: 2.5rem; }
.platform-group-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 1.25rem; text-align: center; }
.platforms-flex { display: flex; flex-wrap: wrap; gap: 0.85rem; justify-content: center; }
.pf-chip { display: inline-flex; align-items: center; gap: 0.5rem; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-full); padding: 0.55rem 1.15rem; font-size: 0.88rem; font-weight: 600; color: var(--text-primary); transition: all 0.3s var(--ease); }
.pf-chip:hover { border-color: var(--accent); box-shadow: 0 4px 14px var(--accent-glow); transform: translateY(-2px); }
.pf-chip em { font-style: normal; font-size: 0.7rem; font-weight: 500; color: var(--text-muted); }
.pf-icon-img { width: 18px; height: 18px; border-radius: 4px; }

/* ===== Comparison ===== */
.cmp-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-top: 3rem; }
.cmp-col { border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; background: var(--white); }
.cmp-col:last-child { border-color: var(--accent); box-shadow: 0 8px 30px var(--accent-glow); transform: scale(1.02); }
.cmp-header { padding: 1.1rem 1rem; font-size: 0.92rem; font-weight: 700; text-align: center; background: var(--light-bg); color: var(--text-secondary); }
.cmp-col:last-child .cmp-header { background: var(--accent); color: var(--white); }
.cmp-cell { padding: 0.95rem 1.1rem; font-size: 0.82rem; color: var(--text-secondary); border-top: 1px solid var(--border); line-height: 1.6; }
.cmp-col:last-child .cmp-cell { color: var(--text-primary); font-weight: 600; }

/* ===== About ===== */
.about-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 4rem; align-items: center; margin-top: 3rem; }
.about-visual { text-align: center; }
.about-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.about-stat { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem 1rem; transition: all 0.3s var(--ease); }
.about-stat:hover { border-color: var(--accent-border); transform: translateY(-3px); }
.about-stat .num { font-size: 1.9rem; font-weight: 800; color: var(--accent); }
.about-stat .label { font-size: 0.8rem; color: var(--text-muted); }
.about-content h3 { font-size: clamp(1.5rem, 2.5vw, 2rem); line-height: 1.35; margin-bottom: 1.5rem; }
.about-text { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.85; }
.about-tags { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.5rem; }
.about-tag { padding: 0.35rem 0.95rem; background: var(--accent-light); color: var(--accent-dark); font-size: 0.78rem; font-weight: 600; border-radius: var(--radius-full); }

/* ===== Promise flip cards ===== */
.pm-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; max-width: 1120px; margin: 0 auto; }
.pm-flip { perspective: 1100px; }
.pm-flip-in { position: relative; width: 100%; height: 300px; transition: transform 0.32s; transform-style: preserve-3d; }
.pm-flip:hover .pm-flip-in, .pm-flip:focus-within .pm-flip-in { transform: rotateY(180deg); }
.pm-face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: 16px; border: 1px solid rgba(17, 24, 39, 0.12); padding: 1.7rem 1.5rem; display: flex; flex-direction: column; text-align: left; background: #fff; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03); }
.pm-face h3 { font-size: 1.12rem; color: #111827; margin: 0.5rem 0 0.4rem; font-weight: 700; }
.pm-tag { font-size: 0.72rem; font-weight: 700; color: var(--accent); letter-spacing: 0.05em; }
.pm-desc { color: #475569; font-size: 0.92rem; line-height: 1.7; margin: 0; flex-grow: 1; }
.pm-hint { color: #9ca3af; font-size: 0.78rem; margin-top: 0.7rem; }
.pm-back { transform: rotateY(180deg); background: #f3f4f6; border-color: rgba(10, 186, 181, 0.3); justify-content: center; }
.pm-back p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.8; }
.pm-back strong { color: var(--accent-dark); }

/* ===== Brand marquee ===== */
.brand-wall-section { background: var(--white); overflow: hidden; }
.marquee-wrapper { overflow: hidden; position: relative; }
.marquee-wrapper::before, .marquee-wrapper::after { content: ''; position: absolute; top: 0; bottom: 0; width: 100px; z-index: 2; pointer-events: none; }
.marquee-wrapper::before { left: 0; background: linear-gradient(90deg, var(--white), transparent); }
.marquee-wrapper::after { right: 0; background: linear-gradient(-90deg, var(--white), transparent); }
.marquee-track { display: flex; gap: 1rem; width: max-content; animation: marqueeScroll 40s linear infinite; }
.marquee-wrapper:hover .marquee-track { animation-play-state: paused; }
.marquee-reverse .marquee-track { animation-name: marqueeScrollReverse; }
@keyframes marqueeScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
@keyframes marqueeScrollReverse { 0% { transform: translateX(-50%); } 100% { transform: translateX(0); } }
.mq-chip { display: inline-flex; align-items: center; gap: 0.5rem; flex-shrink: 0; padding: 0.7rem 1.5rem; background: var(--off-white); border: 1px solid var(--border); border-radius: var(--radius-full); font-size: 0.9rem; font-weight: 600; color: var(--text-secondary); white-space: nowrap; }
.mq-chip i { font-style: normal; font-size: 0.7rem; color: var(--accent); font-weight: 700; }

/* ===== Testimonials ===== */
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.testimonial-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.75rem 1.5rem; display: flex; flex-direction: column; transition: all 0.35s var(--ease); }
.testimonial-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--accent-border); }
.tm-quote { font-size: 0.95rem; color: var(--text-primary); line-height: 1.8; flex-grow: 1; }
.tm-quote::before { content: '“'; color: var(--accent); font-size: 1.5rem; font-weight: 800; margin-right: 0.1rem; }
.tm-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-top: 1.25rem; }
.tm-client { font-size: 0.85rem; font-weight: 700; color: var(--text-primary); }
.tm-industry { font-size: 0.72rem; color: var(--text-muted); }
.tm-tag { font-size: 0.68rem; font-weight: 600; color: var(--accent-dark); background: var(--accent-light); padding: 0.2rem 0.6rem; border-radius: var(--radius-full); margin-left: auto; }

/* ===== Region / Global ===== */
.global-section { background: linear-gradient(180deg, var(--darker), var(--darkest)); color: var(--white); }
.global-section .section-title { color: var(--white); }
.region-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; max-width: 880px; margin: 3rem auto 0; }
.region-card { background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius-xl); padding: 2.25rem 2rem; transition: all 0.35s var(--ease); position: relative; overflow: hidden; }
.region-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--accent), transparent); }
.region-card:hover { border-color: var(--accent-border); background: rgba(10, 186, 181, 0.06); transform: translateY(-4px); }
.region-tag { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.15em; color: var(--accent); text-transform: uppercase; }
.region-card h3 { font-size: 1.35rem; color: var(--white); margin: 0.6rem 0 0.4rem; }
.region-card .region-addr { font-size: 0.9rem; color: rgba(255, 255, 255, 0.65); }
.region-card .region-desc { font-size: 0.82rem; color: rgba(255, 255, 255, 0.45); margin-top: 1rem; line-height: 1.7; }
.region-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); margin-right: 0.5rem; position: relative; }
.region-dot::after { content: ''; position: absolute; inset: -4px; border-radius: 50%; border: 1px solid var(--accent); animation: dotRipple 1.8s ease-out infinite; }
@keyframes dotRipple { 0% { transform: scale(0.6); opacity: 1; } 100% { transform: scale(1.8); opacity: 0; } }

/* ===== Contact ===== */
.contact-section { background: linear-gradient(135deg, var(--dark) 0%, var(--darker) 100%); color: var(--white); text-align: center; position: relative; overflow: hidden; }
.contact-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 700px 400px at 50% 0%, rgba(10, 186, 181, 0.12), transparent); }
.contact-title { font-size: clamp(2rem, 4.5vw, 3.2rem); font-weight: 800; line-height: 1.25; position: relative; }
.contact-sub { font-size: 1.05rem; color: rgba(255, 255, 255, 0.6); margin-top: 1.5rem; line-height: 1.9; position: relative; }
.contact-actions { display: flex; justify-content: center; gap: 1rem; margin-top: 2.5rem; flex-wrap: wrap; position: relative; }
.btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255, 255, 255, 0.4); padding: 1rem 2rem; border-radius: var(--radius-full); cursor: pointer; font-weight: 600; font-size: 1rem; transition: all 0.3s ease; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ===== Footer ===== */
.site-footer { background: var(--darkest); color: rgba(255, 255, 255, 0.6); padding: 4rem 0 2rem; }
.footer-top { display: grid; grid-template-columns: 1.3fr 0.8fr 1.4fr; gap: 3rem; }
.footer-logo { height: 44px; width: auto; margin-bottom: 1.25rem; }
.footer-desc { font-size: 0.85rem; line-height: 1.8; max-width: 320px; }
.footer-social-group { margin-top: 1.5rem; }
.footer-social-group h6 { font-size: 0.75rem; color: rgba(255, 255, 255, 0.45); font-weight: 600; margin-bottom: 0.6rem; letter-spacing: 0.05em; }
.social-links { display: flex; gap: 0.6rem; }
.social-link { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 50%; transition: all var(--duration); cursor: pointer; font-size: 0.8rem; color: rgba(255, 255, 255, 0.7); }
.social-link:hover { border-color: var(--accent); background: rgba(10, 186, 181, 0.12); color: var(--accent); }
.footer-col h5 { font-size: 0.92rem; color: var(--white); margin-bottom: 1.1rem; }
.footer-col a { display: block; font-size: 0.84rem; color: rgba(255, 255, 255, 0.55); margin-bottom: 0.6rem; }
.footer-col a:hover { color: var(--accent); }
.footer-col p { font-size: 0.8rem; line-height: 1.8; margin-bottom: 0.75rem; }
.footer-col p strong { color: rgba(255, 255, 255, 0.85); }
.footer-contact-line { margin-top: 1rem; color: rgba(255, 255, 255, 0.5); font-size: 0.8rem; }
.footer-divider { height: 1px; background: rgba(255, 255, 255, 0.08); margin: 2.5rem 0 1.5rem; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; font-size: 0.75rem; color: rgba(255, 255, 255, 0.35); }
.footer-bottom a:hover { color: var(--accent); }

/* ===== QR modal ===== */
.qr-modal { position: fixed; inset: 0; z-index: 3000; background: rgba(6, 6, 16, 0.7); backdrop-filter: blur(6px); display: none; align-items: center; justify-content: center; }
.qr-modal.active { display: flex; }
.qr-modal-content { background: var(--white); border-radius: var(--radius-xl); padding: 2.5rem 3rem; text-align: center; position: relative; animation: modalIn 0.3s var(--ease); }
.qr-modal-content img { width: 260px; height: auto; margin: 0 auto 1rem; border-radius: var(--radius-md); }
.qr-modal-content p { font-size: 0.9rem; color: var(--text-secondary); }
.qr-modal-content .qr-phone { font-size: 1.1rem; font-weight: 800; color: var(--accent-dark); margin-top: 0.5rem; }
.qr-close { position: absolute; top: 0.8rem; right: 1.2rem; font-size: 1.6rem; color: var(--text-muted); cursor: pointer; line-height: 1; }
.qr-close:hover { color: var(--text-primary); }
@keyframes modalIn { from { opacity: 0; transform: scale(0.95) translateY(10px); } to { opacity: 1; transform: scale(1) translateY(0); } }

/* ===== Lead modal ===== */
.lead-modal-overlay { position: fixed; inset: 0; z-index: 3000; background: rgba(6, 6, 16, 0.7); backdrop-filter: blur(6px); display: none; align-items: center; justify-content: center; padding: 1.5rem; }
.lead-modal-overlay.active { display: flex; }
.lead-modal { background: var(--white); border-radius: var(--radius-xl); padding: 2.5rem; width: 100%; max-width: 560px; max-height: 90vh; overflow-y: auto; position: relative; animation: modalIn 0.3s var(--ease); }
.lead-modal h2 { font-size: 1.5rem; text-align: center; margin-bottom: 0.6rem; }
.lead-modal h2 .hl { color: var(--accent); }
.lead-desc { font-size: 0.82rem; color: var(--text-muted); text-align: center; margin-bottom: 1.75rem; line-height: 1.7; }
.lead-modal-close { position: absolute; top: 1rem; right: 1.4rem; font-size: 1.6rem; color: var(--text-muted); cursor: pointer; line-height: 1; }
.lead-modal-close:hover { color: var(--text-primary); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-field { margin-bottom: 1rem; }
.form-field label { display: block; font-size: 0.8rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.35rem; }
.form-field .req { color: #EF4444; font-size: 0.75rem; }
.form-field input, .form-field textarea { width: 100%; padding: 0.65rem 0.9rem; border: 1px solid var(--border); border-radius: var(--radius-sm); font-family: inherit; font-size: 0.85rem; color: var(--text-primary); transition: border-color var(--duration); }
.form-field input:focus, .form-field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }
.lead-submit { width: 100%; padding: 0.9rem; background: var(--accent); color: var(--white); font-size: 0.95rem; font-weight: 700; border-radius: var(--radius-full); transition: all var(--duration); margin-top: 0.5rem; }
.lead-submit:hover { background: var(--accent-dark); box-shadow: 0 4px 16px var(--accent-glow); }
.lead-submit:disabled { opacity: 0.6; cursor: not-allowed; }
.lead-privacy { font-size: 0.7rem; color: var(--text-muted); text-align: center; margin-top: 1rem; }
.lead-success { text-align: center; padding: 2rem 0; }
.lead-success .check-icon { width: 64px; height: 64px; margin: 0 auto 1.25rem; display: flex; align-items: center; justify-content: center; background: var(--accent-light); color: var(--accent); border-radius: 50%; }
.lead-success h3 { font-size: 1.3rem; margin-bottom: 0.6rem; }
.lead-success p { font-size: 0.88rem; color: var(--text-secondary); }

/* ===== Floating buttons ===== */
.floating-action-stack { position: fixed; bottom: 2rem; right: 2rem; z-index: 998; display: flex; flex-direction: column; gap: 0.75rem; align-items: flex-end; }
.fab { width: 64px; height: 64px; display: flex; align-items: center; justify-content: center; border-radius: 50%; cursor: pointer; transition: all 0.3s; }
.fab-wechat { background: rgba(10, 186, 181, 0.92); color: #fff; box-shadow: 0 4px 15px rgba(10, 186, 181, 0.3); animation: floatPulse 2.6s ease-in-out infinite; }
.fab-wechat:hover { background: var(--accent); transform: translateY(-2px); }
.fab-form { background: #fff; color: var(--accent); border: 1px solid rgba(10, 186, 181, 0.3); box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05); }
.fab-form:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 4px 15px rgba(10, 186, 181, 0.2); }
@keyframes floatPulse { 0%, 100% { box-shadow: 0 6px 24px var(--accent-glow); } 50% { box-shadow: 0 8px 32px rgba(10, 186, 181, 0.45); } }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .geo-grid, .stats-grid, .tech-cap-grid, .tech-agent-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: repeat(3, 1fr); }
  .cmp-grid { grid-template-columns: repeat(2, 1fr); }
  .about-layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { gap: 0.9rem; }
  .nav-links a { font-size: 0.8rem; }
}

@media (max-width: 768px) {
  html { font-size: 16px; }
  .hide-on-mobile { display: none; }
  .nav-links { position: fixed; inset: 0; background: rgba(255, 255, 255, 0.98); backdrop-filter: blur(20px); flex-direction: column; justify-content: center; gap: 1.5rem; transform: translateX(100%); transition: transform 0.4s var(--ease); z-index: 1001; }
  body.menu-open .nav-links { transform: translateX(0); }
  .nav-links a { font-size: 1.1rem; }
  .nav-right { display: none; }
  .nav-toggle { display: flex; }
  body.menu-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  body.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
  body.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .vision-grid { grid-template-columns: 1fr; }
  .vision-arrow { transform: rotate(90deg); margin: -0.5rem auto; }
  .vision-strategy { grid-template-columns: 1fr; }
  .stats-grid, .geo-grid, .tech-cap-grid, .tech-agent-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr 1fr; }
  .cmp-grid { grid-template-columns: 1fr; }
  .cmp-col:last-child { transform: none; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .region-grid { grid-template-columns: 1fr; }
  .iceberg-depth-features { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 2rem; }
  .form-row { grid-template-columns: 1fr; }
  .floating-action-stack { bottom: 1.25rem; right: 1.25rem; }
  .fab { width: 54px; height: 54px; }
}

@media (max-width: 520px) {
  .services-grid { grid-template-columns: 1fr; }
  .iceberg-peak, .iceberg-depth { padding: 1.75rem 1.25rem; }
  .lead-modal { padding: 1.75rem 1.25rem; }
}