/* ============================================
   中辰数通 - 浅色版设计系统 v2
   配色：蓝(主) + 绿(主) + 黄(辅助)
   风格：简洁科技感、年轻活力、移动端自适应
   ============================================ */

:root {
    /* ===== Colors ===== */
    --bg-base: #f6f9fc;
    --bg-surface: #eef3f8;
    --bg-card: #ffffff;
    --bg-elevated: #ffffff;
    --bg-hover: #f1f6fb;

    /* 蓝色 - 致远互联品牌色（按截图纯蓝优化） */
    --primary: #0051f6;
    --primary-light: #3b7aff;
    --primary-dark: #0042cc;
    --primary-glow: rgba(0, 81, 246, 0.10);
    --primary-soft: rgba(0, 81, 246, 0.06);
    --primary-gradient: linear-gradient(135deg, #0051f6 0%, #3b7aff 100%);

    /* 绿色 - 主色 */
    --green: #10b981;
    --green-light: #34d399;
    --green-dark: #059669;
    --green-glow: rgba(16, 185, 129, 0.10);
    --green-soft: rgba(16, 185, 129, 0.06);

    /* 黄色 - 辅助色 */
    --accent: #f59e0b;
    --accent-light: #fbbf24;
    --accent-glow: rgba(245, 158, 11, 0.10);
    --accent-soft: rgba(245, 158, 11, 0.06);

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    --border: #e2e8f0;
    --border-light: #eff5fa;
    --border-glow: rgba(0, 81, 246, 0.15);

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 5rem;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.07);
    --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.10);
    --shadow-glow: 0 8px 32px rgba(0, 81, 246, 0.18);
    --shadow-green: 0 8px 32px rgba(16, 185, 129, 0.12);

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    --container-max: 1200px;
    --nav-height: 64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-sans);
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* ===== Particle Canvas ===== */
.particle-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: auto;
}

/* ===== Navigation ===== */
.nav {
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: all var(--transition-normal);
}
.nav-scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}
.nav-inner {
    max-width: var(--container-max); margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 100%;
    display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text-primary); text-decoration: none; }
.nav-logo-text { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.2; }
.nav-logo-name { font-size: 1.2rem; font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif; font-weight: 700; letter-spacing: 1px; }
.nav-logo-domain { font-size: 0.72rem; color: var(--text-muted); font-family: 'Microsoft YaHei', sans-serif; letter-spacing: 0.8px; margin-top: 0; text-align: left; }
.nav-logo-icon {
    width: 38px; height: 38px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
}
.nav-menu { display: flex; align-items: center; gap: var(--space-sm); }
.nav-link {
    color: var(--text-secondary); font-size: 0.875rem; font-weight: 500;
    padding: 8px 14px; border-radius: var(--radius-sm);
    transition: all var(--transition-fast); position: relative;
}
.nav-link:hover { color: var(--primary); background: var(--primary-soft); }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after {
    content: ''; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%);
    width: 20px; height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    border-radius: 1px;
}
.nav-cta {
    background: var(--primary);
    color: white !important; font-weight: 600;
    padding: 9px 22px; border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(0, 81, 246, 0.40); }
.nav-cta.active::after { display: none; }
.nav-toggle { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; padding: 4px; }

/* ===== Hero ===== */
.hero {
    min-height: 100vh; display: flex; align-items: center;
    position: relative; overflow: hidden;
    padding-top: var(--nav-height);
}
.hero-bg {
    position: absolute; inset: 0; z-index: 0;
    background:
        radial-gradient(ellipse at 15% 25%, var(--primary-glow), transparent 50%),
        radial-gradient(ellipse at 85% 65%, var(--green-glow), transparent 50%),
        radial-gradient(ellipse at 50% 90%, var(--accent-glow), transparent 40%);
}
.hero-grid {
    position: absolute; inset: 0; z-index: 0;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
}
.hero-content { position: relative; z-index: 1; max-width: 720px; padding: var(--space-lg) 0; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--green-dark); padding: 7px 18px;
    border-radius: var(--radius-full); font-size: 0.82rem; font-weight: 600;
    margin-bottom: var(--space-md); box-shadow: var(--shadow-sm);
}
.hero-badge::before {
    content: ''; width: 8px; height: 8px;
    background: var(--green); border-radius: 50%;
    animation: pulse 2s infinite;
    box-shadow: 0 0 8px var(--green-glow);
}
.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800; line-height: 1.18; margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 60%, var(--primary-dark) 100%);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-subtitle {
    font-size: 1.1rem; color: var(--text-secondary);
    margin-bottom: var(--space-xl); line-height: 1.75;
}
.hero-actions { display: flex; gap: var(--space-sm); flex-wrap: wrap; }

/* Hero 浮动装饰 */
.hero-orb {
    position: absolute; border-radius: 50%; pointer-events: none; z-index: 0;
}
.hero-orb-1 { width: 12px; height: 12px; background: var(--primary); top: 20%; right: 15%; box-shadow: 0 0 16px var(--primary-glow); animation: floatY 4s ease-in-out infinite; }
.hero-orb-2 { width: 8px; height: 8px; background: var(--green); bottom: 25%; right: 8%; box-shadow: 0 0 12px var(--green-glow); animation: floatY 3s ease-in-out infinite reverse; }
.hero-orb-3 { width: 10px; height: 10px; background: var(--accent); top: 60%; right: 22%; box-shadow: 0 0 14px var(--accent-glow); animation: floatY 5s ease-in-out infinite; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 28px; border-radius: var(--radius-full);
    font-size: 0.92rem; font-weight: 600; border: none; cursor: pointer;
    transition: all var(--transition-fast); white-space: nowrap;
}
.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 81, 246, 0.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 81, 246, 0.40); background: var(--primary-dark); }
.btn-secondary {
    background: var(--bg-card); color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-hover); border-color: var(--primary); color: var(--primary); }
.btn-accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: white;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.20);
}
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245, 158, 11, 0.28); }

/* ===== Section ===== */
.section { padding: var(--space-3xl) 0; position: relative; }
.section-header { text-align: center; margin-bottom: var(--space-2xl); }
.section-tag {
    display: inline-block; color: var(--green-dark);
    font-size: 0.8rem; font-weight: 700; letter-spacing: 1.5px;
    text-transform: uppercase; margin-bottom: var(--space-sm);
}
.section-tag::before { content: ''; display: inline-block; width: 16px; height: 2px; background: var(--green); border-radius: 1px; vertical-align: middle; margin-right: 8px; }
.section-title { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; margin-bottom: var(--space-sm); color: var(--text-primary); }
.section-desc { font-size: 1.02rem; color: var(--text-secondary); max-width: 640px; margin: 0 auto; line-height: 1.75; }

/* ===== Capability Cards ===== */
.cap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.cap-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: var(--space-xl);
    transition: all var(--transition-normal); position: relative; overflow: hidden;
    box-shadow: var(--shadow-sm); cursor: pointer;
}
.cap-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    transform: scaleX(0); transform-origin: left;
    transition: transform var(--transition-normal);
}
.cap-card:hover { border-color: var(--border-glow); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.cap-card:hover::before { transform: scaleX(1); }
.cap-card-head {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}
.cap-icon {
    width: 64px; height: 64px; border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.4rem; flex-shrink: 0;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}
.cap-icon::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(currentColor 1px, transparent 1px),
        linear-gradient(90deg, currentColor 1px, transparent 1px);
    background-size: 8px 8px;
    opacity: 0.06;
    pointer-events: none;
}
.cap-icon-1 {
    background: linear-gradient(135deg, var(--primary-soft) 0%, rgba(0, 81, 246, 0.04) 60%, transparent 100%);
    color: var(--primary);
    box-shadow: inset 0 0 0 1px rgba(0, 81, 246, 0.15), 0 4px 12px -4px rgba(0, 81, 246, 0.25);
}
.cap-icon-2 {
    background: linear-gradient(135deg, var(--green-soft) 0%, rgba(16, 185, 129, 0.04) 60%, transparent 100%);
    color: var(--green-dark);
    box-shadow: inset 0 0 0 1px rgba(16, 185, 129, 0.18), 0 4px 12px -4px rgba(16, 185, 129, 0.25);
}
.cap-icon-3 {
    background: linear-gradient(135deg, var(--accent-soft) 0%, rgba(245, 158, 11, 0.04) 60%, transparent 100%);
    color: var(--accent);
    box-shadow: inset 0 0 0 1px rgba(245, 158, 11, 0.18), 0 4px 12px -4px rgba(245, 158, 11, 0.25);
}
.cap-icon svg { position: relative; z-index: 1; }
.cap-icon svg .pulse {
    transform-origin: center;
    animation: cap-pulse 2.4s ease-in-out infinite;
}
@keyframes cap-pulse {
    0%, 100% { opacity: 0.4; transform: scale(0.85); }
    50% { opacity: 1; transform: scale(1.15); }
}
.cap-icon svg .scan {
    stroke-dasharray: 4 3;
    animation: cap-scan 3s linear infinite;
}
@keyframes cap-scan {
    to { stroke-dashoffset: -28; }
}
.cap-card:hover .cap-icon { transform: translateY(-2px) rotate(-3deg); }
.cap-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: var(--space-xs); }
.cap-card-head h3 { margin-bottom: 0; }
.cap-card p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; margin-bottom: var(--space-md); }
.cap-features { display: flex; flex-wrap: wrap; gap: 8px; }
.cap-feature {
    font-size: 0.78rem; color: var(--text-secondary);
    background: var(--bg-surface); padding: 5px 12px;
    border-radius: var(--radius-full); border: 1px solid var(--border);
    transition: all var(--transition-fast);
}
.cap-card:hover .cap-feature { border-color: var(--border-glow); }

/* Capability Solutions List */
.cap-solutions {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px dashed var(--border);
}
.cap-sol-label {
    display: block; font-size: 0.72rem; font-weight: 700;
    color: var(--text-muted); letter-spacing: 1px;
    text-transform: uppercase; margin-bottom: 10px;
}
.cap-sol-list { display: flex; flex-wrap: wrap; gap: 6px; }
.cap-sol-item {
    font-size: 0.76rem; color: var(--text-secondary);
    padding: 4px 10px; border-radius: var(--radius-sm);
    background: var(--bg-surface); border: 1px solid var(--border);
    transition: all var(--transition-fast);
}
.cap-sol-item:hover { color: var(--primary); border-color: var(--border-glow); background: var(--primary-soft); }

/* ===== Stats ===== */
.stats-bar {
    display: flex; justify-content: center; gap: var(--space-3xl);
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
    margin: var(--space-2xl) 0;
}
.stat-item { text-align: center; }
.stat-num {
    font-size: 2.4rem; font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { color: var(--text-secondary); font-size: 0.88rem; margin-top: 4px; }

/* ===== Industry Cases ===== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.case-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: var(--space-lg);
    transition: all var(--transition-normal); box-shadow: var(--shadow-sm);
    position: relative; overflow: hidden;
}
.case-card::before {
    content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
    background: linear-gradient(180deg, var(--primary), var(--primary-dark));
    transform: scaleY(0); transform-origin: top;
    transition: transform var(--transition-normal);
}
.case-card:hover { border-color: var(--border-glow); transform: translateY(-4px); box-shadow: var(--shadow-md); }
.case-card:hover::before { transform: scaleY(1); }
.case-tag {
    display: inline-block; font-size: 0.72rem; font-weight: 600;
    padding: 4px 12px; border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
}
.tag-blue { color: var(--primary); background: var(--primary-soft); }
.tag-green { color: var(--green-dark); background: var(--green-soft); }
.tag-yellow { color: var(--accent); background: var(--accent-soft); }
.tag-purple { color: #7c3aed; background: rgba(139, 92, 246, 0.06); }
.tag-cyan { color: var(--primary); background: var(--primary-soft); }
.case-card h4 { font-size: 1.08rem; font-weight: 700; margin-bottom: var(--space-xs); }
.case-card p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.65; }

/* ===== Product Page ===== */
.product-category { margin-bottom: var(--space-3xl); }
.product-category-header {
    display: flex; align-items: center; gap: var(--space-md);
    margin-bottom: var(--space-xl); padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border);
}
.product-category-num {
    width: 44px; height: 44px;
    background: var(--primary-soft);
    border: 1px solid var(--border); border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.05rem; font-weight: 800;
    color: var(--primary); font-family: var(--font-mono);
}
.product-category-title { font-size: 1.4rem; font-weight: 700; }
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-lg); }
.product-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: var(--space-lg);
    transition: all var(--transition-normal); position: relative; overflow: hidden;
    box-shadow: var(--shadow-sm); cursor: pointer;
}
.product-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    transform: scaleX(0); transform-origin: left;
    transition: transform var(--transition-normal);
}
.product-card:hover { border-color: var(--border-glow); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.product-card:hover::before { transform: scaleX(1); }
.product-card-name { font-size: 1.25rem; font-weight: 700; margin-bottom: var(--space-xs); }
.product-card-tag {
    display: inline-block; font-size: 0.72rem; font-weight: 600;
    padding: 4px 10px; border-radius: var(--radius-sm);
    margin-bottom: var(--space-sm);
}
.product-card-desc { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.7; margin-bottom: var(--space-md); }
.product-features { display: flex; flex-direction: column; gap: 6px; }
.product-feature { display: flex; align-items: flex-start; gap: 8px; font-size: 0.82rem; color: var(--text-secondary); }
.product-feature::before { content: ''; width: 4px; height: 4px; background: var(--green); border-radius: 50%; margin-top: 8px; flex-shrink: 0; }

/* ===== Solutions Page ===== */
.sol-category { margin-bottom: var(--space-3xl); }
.sol-category-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: var(--space-xl); padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border);
}
.sol-category-title-wrap { display: flex; align-items: center; gap: var(--space-md); }
.sol-category-icon {
    width: 44px; height: 44px; border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
}
.sol-category-title { font-size: 1.3rem; font-weight: 700; }
.sol-category-source { font-size: 0.82rem; color: var(--text-muted); }
.sol-category-source a { color: var(--green-dark); }
.sol-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-md); }
.sol-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-md); padding: var(--space-md) var(--space-lg);
    transition: all var(--transition-fast); cursor: pointer; box-shadow: var(--shadow-sm);
}
.sol-card:hover { border-color: var(--border-glow); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.sol-card h4 { font-size: 1.02rem; font-weight: 600; margin-bottom: 6px; }
.sol-card p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.5; }
.sol-arrow { color: var(--text-muted); transition: all var(--transition-fast); }
.sol-card:hover .sol-arrow { color: var(--primary); transform: translateX(4px); }

.sol-sub-header {
    color: var(--text-secondary); font-size: 0.82rem; font-weight: 600;
    margin-bottom: var(--space-md); font-family: var(--font-mono); letter-spacing: 1px;
    display: flex; align-items: center; gap: 8px;
}
.sol-sub-header::before { content: ''; width: 16px; height: 2px; background: var(--green); border-radius: 1px; }

/* ===== About ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); align-items: center; }
.about-text h3 { font-size: 1.6rem; font-weight: 700; margin-bottom: var(--space-md); }
.about-text p { color: var(--text-secondary); line-height: 1.8; margin-bottom: var(--space-md); }
.about-list { display: flex; flex-direction: column; gap: var(--space-sm); }
.about-list-item {
    display: flex; align-items: center; gap: 10px; font-size: 0.92rem;
    padding: 10px 16px; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-sm); transition: all var(--transition-fast);
}
.about-list-item:hover { border-color: var(--border-glow); background: var(--bg-hover); transform: translateX(4px); }
.about-check {
    width: 22px; height: 22px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem; font-weight: 700; flex-shrink: 0;
}

/* ===== CTA ===== */
.cta-banner {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-surface));
    border: 1px solid var(--border); border-radius: var(--radius-xl);
    padding: var(--space-2xl); text-align: center;
    position: relative; overflow: hidden; box-shadow: var(--shadow-md);
}
.cta-banner::before {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(ellipse at center, var(--primary-soft), transparent 60%);
}
.cta-banner > * { position: relative; z-index: 1; }
.cta-banner h3 { font-size: 1.7rem; font-weight: 700; margin-bottom: var(--space-sm); }
.cta-banner p { color: var(--text-secondary); margin-bottom: var(--space-lg); }

/* ===== Contact Section ===== */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); max-width: 880px; margin: 0 auto; }
.contact-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
    padding: var(--space-xl) var(--space-lg); text-align: center;
    transition: all var(--transition-normal);
}
.contact-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--primary); }
.contact-card-icon {
    width: 56px; height: 56px; border-radius: var(--radius-md); margin: 0 auto var(--space-md);
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--primary-soft), transparent); color: var(--primary);
}
.contact-card:nth-child(2) .contact-card-icon { background: linear-gradient(135deg, var(--green-soft), transparent); color: var(--green-dark); }
.contact-card:nth-child(3) .contact-card-icon { background: linear-gradient(135deg, var(--accent-soft), transparent); color: var(--accent); }
.contact-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: var(--space-xs); }
.contact-card p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.6; }

/* QR card variant (3rd: 企业微信) */
.contact-card--qr { padding: var(--space-lg) var(--space-md); }
.contact-card--qr h4 { margin-bottom: var(--space-md); font-size: 1.1rem; }
.contact-qr-img {
    display: block; width: 160px; height: 160px;
    margin: 0 auto var(--space-md);
    padding: 6px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}
.contact-card--qr p { font-size: 0.85rem; line-height: 1.55; }

/* ===== Footer ===== */
.footer { background: var(--bg-surface); border-top: 1px solid var(--border); padding: var(--space-2xl) 0 var(--space-lg); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-xl); margin-bottom: var(--space-xl); }
.footer-brand { font-size: 1.15rem; font-weight: 700; margin-bottom: var(--space-sm); }
.footer-desc { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.7; max-width: 320px; }
.footer-col h4 { font-size: 0.92rem; font-weight: 600; margin-bottom: var(--space-sm); color: var(--text-primary); }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col a { color: var(--text-secondary); font-size: 0.85rem; transition: color var(--transition-fast); }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
    border-top: 1px solid var(--border); padding-top: var(--space-md);
    display: flex; justify-content: space-between; align-items: center;
    color: var(--text-muted); font-size: 0.82rem;
}

/* ===== Animations ===== */
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes floatY { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.reveal { opacity: 0; }
.reveal.visible { animation: fadeInUp 0.6s ease forwards; }

/* ===== Page Header ===== */
.page-header {
    padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-2xl);
    text-align: center; position: relative; overflow: hidden;
}
.page-header-bg {
    position: absolute; inset: 0; z-index: 0;
    background:
        radial-gradient(ellipse at 30% 50%, var(--primary-glow), transparent 50%),
        radial-gradient(ellipse at 70% 50%, var(--green-glow), transparent 50%);
}
.page-header-grid {
    position: absolute; inset: 0; z-index: 0;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.04) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 60% 50% at center, black 15%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 60% 50% at center, black 15%, transparent 80%);
}
.page-header > .container { position: relative; z-index: 1; }
.breadcrumb { display: flex; justify-content: center; gap: 8px; color: var(--text-muted); font-size: 0.82rem; margin-bottom: var(--space-md); }
.breadcrumb a:hover { color: var(--green-dark); }

/* ===== Responsive ===== */
/* Tablet */
@media (max-width: 1024px) {
    .cap-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-bar { gap: var(--space-2xl); }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
    .footer-col:nth-child(4) { grid-column: 1 / -1; }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --space-3xl: 3rem;
        --space-2xl: 2.5rem;
        --nav-height: 56px;
    }

    .container { padding: 0 var(--space-md); }

    /* Nav */
    .nav-menu { display: none; }
    .nav-toggle { display: block; }
    .nav-menu.open {
        display: flex; flex-direction: column;
        position: absolute; top: var(--nav-height); left: 0; right: 0;
        background: var(--bg-card); border-bottom: 1px solid var(--border);
        padding: var(--space-md); gap: 4px; box-shadow: var(--shadow-lg);
    }
    .nav-menu.open .nav-link { width: 100%; padding: 12px 16px; }
    .nav-menu.open .nav-link.active::after { display: none; }
    .nav-menu.open .nav-cta { margin-top: 8px; text-align: center; }
    .nav-logo-name { font-size: 1rem; }
    .nav-logo-domain { font-size: 0.6rem; }

    /* Hero */
    .hero { min-height: 90vh; }
    .hero-content { padding: var(--space-md) 0; }
    .hero-subtitle { font-size: 1rem; }
    .hero-actions { flex-direction: column; width: 100%; }
    .hero-actions .btn { width: 100%; }
    .hero-orb { display: none; }

    /* Section */
    .section { padding: var(--space-3xl) 0; }
    .section-header { margin-bottom: var(--space-xl); }
    .section-desc { font-size: 0.95rem; }

    /* Capability */
    .cap-grid, .case-grid { grid-template-columns: 1fr; }
    .cap-card { padding: var(--space-lg); }

    /* Stats */
    .stats-bar {
        flex-wrap: wrap; gap: var(--space-lg);
        padding: var(--space-lg) 0;
    }
    .stat-num { font-size: 2rem; }

    /* Products */
    .product-grid { grid-template-columns: 1fr; }
    .product-category-header { flex-direction: row; gap: var(--space-sm); }
    .product-category-num { width: 40px; height: 40px; font-size: 0.95rem; }
    .product-category-title { font-size: 1.2rem; }

    /* Solutions */
    .sol-grid { grid-template-columns: 1fr; }
    .sol-category-header { flex-direction: column; align-items: flex-start; gap: var(--space-sm); }

    /* About */
    .about-grid { grid-template-columns: 1fr; }

    /* CTA */
    .cta-banner { padding: var(--space-lg); }
    .cta-banner h3 { font-size: 1.4rem; }
    .cta-banner .hero-actions { flex-direction: column; }

    /* Contact */
    .contact-grid { grid-template-columns: 1fr; gap: var(--space-md); }

    /* Footer */
    .footer-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
    .footer-col:nth-child(4) { grid-column: auto; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

    /* Page header */
    .page-header { padding: calc(var(--nav-height) + var(--space-2xl)) 0 var(--space-xl); }
}

/* Small mobile */
@media (max-width: 480px) {
    .container { padding: 0 var(--space-sm); }
    .hero-badge { font-size: 0.75rem; padding: 6px 14px; }
    .btn { padding: 10px 22px; font-size: 0.88rem; }
    .stat-num { font-size: 1.75rem; }
    .product-card, .cap-card { padding: var(--space-md); }
    .cap-icon { width: 52px; height: 52px; }
    .cap-icon svg { width: 30px; height: 30px; }
}

/* prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}