:root {
  --color-primary: #0A1628;
  --color-primary-light: #162447;
  --color-accent: #2563EB;
  --color-accent-light: #3B82F6;
  --color-accent-glow: rgba(37, 99, 235, 0.15);
  --color-secondary: #06B6D4;
  --color-secondary-glow: rgba(6, 182, 212, 0.12);
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  --color-bg-dark: #0F172A;
  --color-surface: #F1F5F9;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  --color-text: #1E293B;
  --color-text-secondary: #475569;
  --color-text-muted: #94A3B8;
  --color-text-inverse: #FFFFFF;
  --gradient-hero: linear-gradient(135deg, #0A1628 0%, #162447 40%, #1e3a5f 100%);
  --gradient-accent: linear-gradient(135deg, #2563EB 0%, #06B6D4 100%);
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", Consolas, monospace;
  --space-xs: 0.25rem; --space-sm: 0.5rem; --space-md: 1rem; --space-lg: 1.5rem;
  --space-xl: 2rem; --space-2xl: 3rem; --space-3xl: 4rem; --space-4xl: 6rem;
  --radius-sm: 6px; --radius-md: 12px; --radius-lg: 16px; --radius-xl: 24px; --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.12);
  --transition-fast: 0.15s ease; --transition-base: 0.3s ease; --transition-slow: 0.5s ease;
  --container-max: 1200px; --container-padding: 1.5rem;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font-sans); font-size: 16px; line-height: 1.7; color: var(--color-text); background: var(--color-bg); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent-light); }
ul, ol { list-style: none; }

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); }
.section-title { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; line-height: 1.3; color: var(--color-primary); margin-bottom: var(--space-md); }
.section-subtitle { font-size: clamp(1rem, 2vw, 1.125rem); color: var(--color-text-secondary); max-width: 700px; margin: 0 auto var(--space-2xl); line-height: 1.7; }
.section-header { text-align: center; margin-bottom: var(--space-3xl); }
.badge { display: inline-flex; align-items: center; gap: var(--space-sm); padding: var(--space-xs) var(--space-md); background: var(--color-accent-glow); border: 1px solid rgba(37,99,235,0.12); border-radius: var(--radius-full); font-size: 0.8125rem; font-weight: 600; color: var(--color-accent); margin-bottom: var(--space-lg); }
.badge-dot { width: 6px; height: 6px; background: var(--color-accent); border-radius: 50%; animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(1.2); } }

/* ===== DUAL NAVIGATION ===== */
.navbar-wrapper { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; }
.navbar-wrapper.hide-top .navbar-top { transform: translateY(-100%); }
.navbar-wrapper.hide-top .navbar-bottom { top: 0; }
.navbar-wrapper.scrolled .navbar-bottom { background: rgba(255,255,255,0.97); backdrop-filter: blur(20px) saturate(1.8); -webkit-backdrop-filter: blur(20px) saturate(1.8); border-bottom: 1px solid rgba(226,232,240,0.6); box-shadow: var(--shadow-md); }
.navbar-wrapper.scrolled .navbar-bottom .nav-links a { color: var(--color-text-secondary); }
.navbar-wrapper.scrolled .navbar-bottom .nav-links a:hover { color: var(--color-primary); }
.navbar-wrapper.scrolled .navbar-bottom .nav-cta { background: var(--gradient-accent); color: #fff !important; }
.navbar-wrapper.scrolled .navbar-bottom .menu-toggle { color: var(--color-primary); }
.navbar-wrapper.scrolled .navbar-bottom .nav-bottom-logo img { filter: none; }

/* Top nav: site-wide */
.navbar-top { position: absolute; top: 0; left: 0; width: 100%; background: rgba(255,255,255,0.95); border-bottom: 1px solid rgba(226,232,240,0.6); transition: transform 0.35s ease; z-index: 2; }
.nav-top-inner { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); display: flex; align-items: center; justify-content: space-between; height: 52px; }
.nav-top-logo img { height: 32px; display: block; }
.nav-top-links { display: flex; gap: var(--space-xl); }
.nav-top-links a { font-size: 0.9rem; font-weight: 500; color: var(--color-text-secondary); transition: color var(--transition-fast); position: relative; }
.nav-top-links a:hover { color: var(--color-primary); }
.nav-top-links a.active { color: var(--color-accent); }
.nav-top-links a.active::after { content: ''; position: absolute; bottom: -14px; left: 0; width: 100%; height: 2px; background: var(--gradient-accent); }
.nav-top-right { display: flex; align-items: center; gap: var(--space-md); }
.nav-top-tel { font-size: 0.85rem; color: var(--color-text-muted); display: flex; align-items: center; gap: 4px; }
.nav-top-tel strong { color: var(--color-accent); font-weight: 700; font-size: 0.9rem; }
.nav-top-login { font-size: 0.85rem; color: var(--color-text-secondary); padding: 4px 14px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); transition: all var(--transition-fast); }
.nav-top-login:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* Bottom nav: page-level */
.navbar-bottom { position: absolute; top: 52px; left: 0; width: 100%; background: transparent; transition: top 0.35s ease, background 0.3s ease, border-bottom 0.3s ease, box-shadow 0.3s ease; z-index: 1; }
.nav-bottom-inner { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); display: flex; align-items: center; justify-content: space-between; height: 48px; }
.nav-bottom-logo { display: none; align-items: center; gap: var(--space-sm); }
.nav-bottom-logo img { height: 28px; filter: brightness(0) invert(1); transition: filter 0.3s; }
.navbar-bottom .nav-links { display: flex; gap: var(--space-xl); align-items: center; }
.navbar-bottom .nav-links a { font-size: 0.9rem; font-weight: 500; color: rgba(255,255,255,0.85); transition: color var(--transition-fast); position: relative; padding: 4px 0; }
.navbar-bottom .nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--gradient-accent); border-radius: 1px; transition: width var(--transition-base); }
.navbar-bottom .nav-links a:hover { color: #fff; }
.navbar-bottom .nav-links a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: var(--space-md); }
.nav-cta { display: inline-flex; align-items: center; padding: 0.5rem 1.125rem; background: var(--gradient-accent); color: #fff !important; font-size: 0.85rem; font-weight: 600; border-radius: var(--radius-md); transition: transform var(--transition-fast), box-shadow var(--transition-fast); white-space: nowrap; box-shadow: 0 4px 15px rgba(37,99,235,0.25); }
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 25px rgba(37,99,235,0.35); }
.menu-toggle { display: none; font-size: 1.4rem; color: var(--color-text-inverse); background: none; border: none; cursor: pointer; padding: var(--space-sm); }

/* Mobile nav overlay & panel */
.mobile-nav-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 998; }
.mobile-nav-overlay.open { display: block; }
.mobile-nav-panel { display: block; position: fixed; top: 0; right: 0; width: 300px; max-width: 85vw; height: 100vh; background: #fff; z-index: 999; padding: 80px 24px 24px; overflow-y: auto; transform: translateX(100%); transition: transform 0.35s ease; border-left: 1px solid var(--color-border); }
.mobile-nav-panel.open { transform: translateX(0); }
.mobile-close { position: absolute; top: 20px; right: 20px; width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 1.3rem; color: var(--color-text-muted); background: none; border: none; }
.mobile-close:hover { color: var(--color-text); }
.mobile-section { margin-bottom: 24px; }
.mobile-section h4 { font-size: 0.7rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; }
.mobile-section a { display: block; padding: 10px 0; font-size: 0.92rem; color: var(--color-text-secondary); border-bottom: 1px solid var(--color-border-light); transition: color 0.2s; }
.mobile-section a:hover { color: var(--color-accent); }

/* Hero */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; background: var(--gradient-hero); overflow: hidden; padding-top: 120px; }
.hero-bg-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(37,99,235,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(37,99,235,0.03) 1px, transparent 1px); background-size: 60px 60px; pointer-events: none; }
.hero-glow { position: absolute; width: 600px; height: 600px; border-radius: 50%; background: radial-gradient(circle, rgba(37,99,235,0.12) 0%, transparent 70%); top: -10%; right: -5%; pointer-events: none; animation: float-glow 8s ease-in-out infinite; }
.hero-glow-2 { position: absolute; width: 400px; height: 400px; border-radius: 50%; background: radial-gradient(circle, rgba(6,182,212,0.08) 0%, transparent 70%); bottom: -10%; left: -5%; pointer-events: none; animation: float-glow 10s ease-in-out infinite reverse; }
@keyframes float-glow { 0%, 100% { transform: translate(0, 0) scale(1); } 33% { transform: translate(20px, -20px) scale(1.05); } 66% { transform: translate(-15px, 15px) scale(0.95); } }
.hero .container { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3xl); align-items: center; padding-top: var(--space-4xl); padding-bottom: var(--space-4xl); }
.hero-content { animation: fadeInUp 1s ease-out; }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
.hero-badge { display: inline-flex; align-items: center; gap: var(--space-sm); padding: var(--space-xs) var(--space-lg); background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius-full); font-size: 0.8125rem; font-weight: 500; color: var(--color-secondary); margin-bottom: var(--space-xl); backdrop-filter: blur(10px); }
.hero-badge .dot { width: 6px; height: 6px; background: var(--color-secondary); border-radius: 50%; animation: pulse 2s ease-in-out infinite; }
.hero-title { font-size: clamp(2.25rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.15; color: var(--color-text-inverse); margin-bottom: var(--space-lg); letter-spacing: -0.02em; }
.hero-title .highlight { background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: clamp(1rem, 2vw, 1.125rem); color: rgba(255,255,255,0.7); max-width: 520px; margin-bottom: var(--space-2xl); line-height: 1.8; }
.hero-cta-group { display: flex; gap: var(--space-md); flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-sm); padding: 0.875rem 1.75rem; font-size: 0.9375rem; font-weight: 600; border-radius: var(--radius-md); border: none; cursor: pointer; transition: all var(--transition-fast); white-space: nowrap; }
.btn-primary { background: var(--gradient-accent); color: #fff; box-shadow: 0 4px 16px rgba(37,99,235,0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.4); color: #fff; }
.btn-secondary { background: rgba(255,255,255,0.08); color: #fff; border: 1px solid rgba(255,255,255,0.15); backdrop-filter: blur(10px); }
.btn-secondary:hover { background: rgba(255,255,255,0.15); color: #fff; }
.hero-visual { position: relative; display: flex; align-items: center; justify-content: center; animation: fadeInUp 1s ease-out 0.2s both; }
.hero-visual-inner { position: relative; width: 100%; max-width: 560px; aspect-ratio: 4/3; }
.hero-visual-bg { position: absolute; inset: 0; border-radius: var(--radius-xl); background: linear-gradient(145deg, rgba(37,99,235,0.1), rgba(6,182,212,0.05)); border: 1px solid rgba(255,255,255,0.08); overflow: hidden; }
.hero-svg-illustration { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-visual-overlay { position: absolute; inset: 0; border-radius: var(--radius-xl); background: linear-gradient(180deg, transparent 50%, rgba(10,22,40,0.6) 100%); }
.hero-stats { position: absolute; bottom: var(--space-xl); left: var(--space-xl); right: var(--space-xl); display: flex; gap: var(--space-lg); z-index: 3; }
.hero-stat { flex: 1; padding: var(--space-md); background: rgba(255,255,255,0.08); backdrop-filter: blur(16px); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-md); text-align: center; }
.hero-stat-value { font-size: 1.5rem; font-weight: 700; color: #fff; line-height: 1; }
.hero-stat-label { font-size: 0.6875rem; color: rgba(255,255,255,0.5); margin-top: var(--space-xs); }

/* 通用板块 */
.section { padding: var(--space-4xl) 0; position: relative; }
.section-alt { background: var(--color-bg-alt); }
.section-dark { background: var(--color-bg-dark); color: var(--color-text-inverse); }
.section-dark .section-title { color: var(--color-text-inverse); }
.section-dark .section-subtitle { color: rgba(255,255,255,0.65); }

/* 痛点 */
.pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }
.pain-card { padding: var(--space-xl); background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); text-align: center; transition: all var(--transition-base); }
.pain-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(37,99,235,0.15); }
.pain-icon { width: 56px; height: 56px; margin: 0 auto var(--space-lg); display: flex; align-items: center; justify-content: center; border-radius: var(--radius-md); background: var(--color-accent-glow); color: var(--color-accent); }
.pain-icon svg { width: 28px; height: 28px; }
.pain-title { font-size: 1.0625rem; font-weight: 600; color: var(--color-primary); margin-bottom: var(--space-sm); }
.pain-desc { font-size: 0.875rem; color: var(--color-text-secondary); line-height: 1.6; }

/* 产品全景 */
.overview-visual { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-xl); padding: var(--space-2xl); margin-bottom: var(--space-2xl); overflow: hidden; }
.overview-flow { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); flex-wrap: wrap; }
.overview-step { flex: 1; min-width: 140px; text-align: center; padding: var(--space-lg); background: var(--color-bg-alt); border-radius: var(--radius-md); border: 1px solid var(--color-border-light); transition: all var(--transition-base); }
.overview-step:hover { border-color: var(--color-accent); background: var(--color-accent-glow); }
.overview-step-num { width: 36px; height: 36px; margin: 0 auto var(--space-md); display: flex; align-items: center; justify-content: center; background: var(--gradient-accent); color: #fff; font-size: 0.875rem; font-weight: 700; border-radius: 50%; }
.overview-step-title { font-size: 0.9375rem; font-weight: 600; color: var(--color-primary); margin-bottom: var(--space-xs); }
.overview-step-desc { font-size: 0.8125rem; color: var(--color-text-secondary); }
.overview-arrow { color: var(--color-accent); flex-shrink: 0; }
.overview-arrow svg { width: 24px; height: 24px; }

/* 特性块 */
.feature-block { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3xl); align-items: center; margin-bottom: var(--space-4xl); }
.feature-block:last-child { margin-bottom: 0; }
.feature-block.reverse { direction: rtl; }
.feature-block.reverse > * { direction: ltr; }
.feature-visual { position: relative; border-radius: var(--radius-xl); overflow: hidden; background: linear-gradient(145deg, var(--color-bg-alt), #fff); border: 1px solid var(--color-border); aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center; }
.feature-visual-inner { position: relative; width: 80%; height: 80%; }
.feature-content .badge { margin-bottom: var(--space-lg); }
.feature-content h3 { font-size: clamp(1.375rem, 3vw, 1.75rem); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-md); line-height: 1.4; }
.feature-content p { color: var(--color-text-secondary); margin-bottom: var(--space-lg); line-height: 1.8; }
.feature-list { display: flex; flex-direction: column; gap: var(--space-md); }
.feature-list-item { display: flex; gap: var(--space-md); align-items: flex-start; }
.feature-list-icon { width: 24px; height: 24px; flex-shrink: 0; color: var(--color-accent); margin-top: 2px; }
.feature-list-text h4 { font-size: 0.9375rem; font-weight: 600; color: var(--color-primary); margin-bottom: var(--space-xs); }
.feature-list-text p { font-size: 0.875rem; color: var(--color-text-secondary); margin: 0; line-height: 1.6; }

/* 3D视觉技术 */
.tech-showcase { background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-light) 100%); position: relative; overflow: hidden; }
.tech-showcase::before { content: ''; position: absolute; inset: 0; background: linear-gradient(rgba(37,99,235,0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(37,99,235,0.04) 1px, transparent 1px); background-size: 40px 40px; pointer-events: none; }
.tech-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-xl); position: relative; z-index: 2; }
.tech-card { padding: var(--space-2xl); background: rgba(255,255,255,0.04); backdrop-filter: blur(16px); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-xl); transition: all var(--transition-base); }
.tech-card:hover { background: rgba(255,255,255,0.07); border-color: rgba(37,99,235,0.3); transform: translateY(-4px); }
.tech-card-header { display: flex; align-items: center; gap: var(--space-md); margin-bottom: var(--space-lg); }
.tech-card-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: var(--gradient-accent); border-radius: var(--radius-md); color: #fff; flex-shrink: 0; }
.tech-card-icon svg { width: 24px; height: 24px; }
.tech-card-title { font-size: 1.125rem; font-weight: 700; color: #fff; }
.tech-card-subtitle { font-size: 0.8125rem; color: var(--color-secondary); margin-top: 2px; }
.tech-card-body { color: rgba(255,255,255,0.7); font-size: 0.9375rem; line-height: 1.8; }
.tech-card-body ul { margin-top: var(--space-md); display: flex; flex-direction: column; gap: var(--space-sm); }
.tech-card-body li { display: flex; align-items: flex-start; gap: var(--space-sm); font-size: 0.875rem; }
.tech-card-body li::before { content: ''; width: 5px; height: 5px; background: var(--color-secondary); border-radius: 50%; margin-top: 8px; flex-shrink: 0; }

/* 流程 */
.flow-timeline { display: flex; align-items: stretch; gap: 0; position: relative; }
.flow-step { flex: 1; text-align: center; padding: var(--space-xl) var(--space-md); position: relative; }
.flow-step::after { content: ''; position: absolute; top: 32px; right: -50%; width: 100%; height: 2px; background: linear-gradient(90deg, var(--color-accent), var(--color-secondary)); z-index: 0; }
.flow-step:last-child::after { display: none; }
.flow-step-num { width: 64px; height: 64px; margin: 0 auto var(--space-lg); display: flex; align-items: center; justify-content: center; background: var(--color-bg); border: 2px solid var(--color-accent); border-radius: 50%; color: var(--color-accent); position: relative; z-index: 1; box-shadow: var(--shadow-md); }
.flow-step-title { font-size: 1rem; font-weight: 600; color: var(--color-primary); margin-bottom: var(--space-xs); }
.flow-step-desc { font-size: 0.8125rem; color: var(--color-text-secondary); line-height: 1.5; }

/* 核心价值 */
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-xl); }
.value-card { padding: var(--space-2xl); background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-xl); text-align: center; transition: all var(--transition-base); position: relative; overflow: hidden; }
.value-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-accent); transform: scaleX(0); transition: transform var(--transition-base); }
.value-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.value-card:hover::before { transform: scaleX(1); }
.value-icon { width: 64px; height: 64px; margin: 0 auto var(--space-lg); display: flex; align-items: center; justify-content: center; background: var(--gradient-accent); border-radius: var(--radius-md); color: #fff; box-shadow: var(--shadow-glow); }
.value-icon svg { width: 32px; height: 32px; }
.value-title { font-size: 1.125rem; font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-sm); }
.value-desc { font-size: 0.9375rem; color: var(--color-text-secondary); line-height: 1.7; }

/* 场景 */
.scene-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }
.scene-card { position: relative; border-radius: var(--radius-xl); overflow: hidden; aspect-ratio: 3/4; cursor: pointer; }
.scene-card-bg { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(10,22,40,0.2) 0%, rgba(10,22,40,0.85) 100%); z-index: 1; }
.scene-card-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.scene-card:hover .scene-card-img { transform: scale(1.08); }
.scene-card-content { position: absolute; bottom: 0; left: 0; right: 0; padding: var(--space-xl); z-index: 2; color: #fff; }
.scene-card-num { font-size: 2.5rem; font-weight: 800; color: rgba(255,255,255,0.1); line-height: 1; margin-bottom: var(--space-sm); }
.scene-card-title { font-size: 1.125rem; font-weight: 700; margin-bottom: var(--space-xs); }
.scene-card-desc { font-size: 0.8125rem; color: rgba(255,255,255,0.7); line-height: 1.5; }

/* 资质 */
.cert-section { background: var(--color-bg-dark); position: relative; overflow: hidden; }
.cert-section::before { content: ''; position: absolute; inset: 0; background: linear-gradient(rgba(37,99,235,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(37,99,235,0.03) 1px, transparent 1px); background-size: 50px 50px; pointer-events: none; }
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-xl); position: relative; z-index: 2; }
.cert-card { padding: var(--space-2xl); background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06); border-radius: var(--radius-xl); text-align: center; transition: all var(--transition-base); }
.cert-card:hover { background: rgba(255,255,255,0.06); border-color: rgba(37,99,235,0.2); }
.cert-icon { width: 56px; height: 56px; margin: 0 auto var(--space-lg); display: flex; align-items: center; justify-content: center; background: var(--gradient-accent); border-radius: var(--radius-md); color: #fff; }
.cert-icon svg { width: 28px; height: 28px; }
.cert-type { font-size: 0.75rem; font-weight: 600; color: var(--color-secondary); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-sm); }
.cert-title { font-size: 1.0625rem; font-weight: 700; color: #fff; margin-bottom: var(--space-sm); }
.cert-number { font-family: var(--font-mono); font-size: 0.8125rem; color: rgba(255,255,255,0.5); word-break: break-all; }

/* CTA */
.cta-section { background: var(--gradient-hero); position: relative; overflow: hidden; text-align: center; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: linear-gradient(rgba(37,99,235,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(37,99,235,0.05) 1px, transparent 1px); background-size: 60px 60px; pointer-events: none; }
.cta-glow { position: absolute; width: 500px; height: 500px; border-radius: 50%; background: radial-gradient(circle, rgba(37,99,235,0.1) 0%, transparent 70%); top: 50%; left: 50%; transform: translate(-50%, -50%); pointer-events: none; }
.cta-content { position: relative; z-index: 2; max-width: 640px; margin: 0 auto; }
.cta-title { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 800; color: #fff; margin-bottom: var(--space-md); }
.cta-desc { font-size: 1.0625rem; color: rgba(255,255,255,0.65); margin-bottom: var(--space-2xl); line-height: 1.7; }
.cta-buttons { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }

/* 页脚 */
.footer { background: #070d18; border-top: 1px solid rgba(255,255,255,0.05); padding: var(--space-2xl) 0; }
.footer-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-lg); }
.footer-brand { display: flex; align-items: center; gap: var(--space-md); }
.footer-brand img { height: 28px; width: auto; opacity: 0.8; }
.footer-brand-text { font-size: 0.9375rem; font-weight: 600; color: rgba(255,255,255,0.8); }
.footer-info { font-size: 0.8125rem; color: rgba(255,255,255,0.4); text-align: right; }

/* 滚动动画 */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }
.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; }

/* 回到顶部 */
.back-to-top { position: fixed; bottom: 2rem; right: 2rem; width: 44px; height: 44px; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all var(--transition-base); box-shadow: var(--shadow-md); z-index: 999; }
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }
.back-to-top svg { width: 18px; height: 18px; }

/* ========================
   响应式设计
   ======================== */

@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-cta-group { justify-content: center; }
  .feature-block, .feature-block.reverse { grid-template-columns: 1fr; direction: ltr; }
  .feature-block.reverse > * { direction: ltr; }
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --container-padding: 1rem; --space-4xl: 4rem; }
  .navbar-wrapper.hide-top .navbar-top { transform: translateY(-100%); }
  .nav-top-right .nav-top-tel { display: none; }
  .nav-top-inner { height: 48px; }
  .nav-top-logo img { height: 28px; }
  .nav-bottom-inner { height: 48px; }
  .nav-bottom-logo { display: flex !important; }
  .nav-bottom-logo img { height: 26px; filter: brightness(0) invert(1); }
  .navbar-wrapper.scrolled .nav-bottom-logo img { filter: none; }
  .navbar-bottom .nav-links { display: none; }
  .nav-cta { display: none; }
  .menu-toggle { display: block; }
  .hero-stats { flex-wrap: wrap; gap: var(--space-sm); }
  .hero-stat { min-width: calc(50% - var(--space-sm)); }
  .pain-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: 1fr; }
  .flow-timeline { flex-direction: column; gap: var(--space-xl); }
  .flow-step::after { display: none; }
  .flow-step-num { margin-bottom: var(--space-md); }
  .value-grid { grid-template-columns: 1fr; }
  .scene-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr; }
  .overview-flow { flex-direction: column; align-items: stretch; }
  .overview-arrow { transform: rotate(90deg); align-self: center; }
  .footer-content { flex-direction: column; text-align: center; }
  .footer-info { text-align: center; }
}

@media (max-width: 480px) {
  .pain-grid { grid-template-columns: 1fr; }
  .hero-stat-value { font-size: 1.25rem; }
  .btn { padding: 0.75rem 1.25rem; font-size: 0.875rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}

@media print {
  .navbar-wrapper, .back-to-top, .hero-visual, .hero-cta-group, .cta-section, .footer { display: none !important; }
  .hero { min-height: auto; padding: 2rem 0; }
  .section { padding: 2rem 0; }
  body { color: #000; background: #fff; }
}