/* ==========================================================================
   Center3 官网 — 样式
   ========================================================================== */

/* ---------- Reset & Variables ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
    /* Colors — enterprise blue/teal, no AI indigo-purple */
    --c-primary:#2563eb;
    --c-primary-dark:#1d4ed8;
    --c-primary-light:#93c5fd;
    --c-secondary:#0d9488;
    --c-accent:#0ea5e9;
    --c-success:#10b981;
    --c-warning:#f59e0b;
    --c-danger:#ef4444;
    --c-bg:#ffffff;
    --c-bg-alt:#f8fafc;
    --c-bg-dark:#0f172a;
    --c-bg-dark-alt:#1e293b;
    --c-text:#1e293b;
    --c-text-secondary:#64748b;
    --c-text-dark:#e2e8f0;
    --c-text-dark-secondary:#94a3b8;
    --c-border:#e2e8f0;
    --c-border-dark:#334155;
    --c-success-bg:#d1fae5;
    --c-warning-bg:#fef3c7;
    /* Layout */
    --max-w:1200px;
    --nav-h:70px;
    --radius:12px;
    --radius-sm:8px;
    --radius-lg:16px;
    /* Transitions */
    --t-fast:0.2s ease;
    --t-normal:0.3s ease;
    --t-slow:0.5s ease;
    /* Shadows */
    --shadow-sm:0 1px 3px rgba(0,0,0,0.08);
    --shadow:0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg:0 12px 40px rgba(0,0,0,0.12);
    --shadow-glow:0 0 30px rgba(37,99,235,0.25);
}

html{scroll-behavior:smooth}
body{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif;
    color:var(--c-text);
    background:var(--c-bg);
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
}

/* ---------- Container ---------- */
.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 24px}

/* ---------- Navigation ---------- */
.navbar{
    position:fixed;top:0;left:0;right:0;
    height:var(--nav-h);
    background:rgba(255,255,255,0.85);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    border-bottom:1px solid var(--c-border);
    z-index:1000;
    transition:var(--t-normal);
}
.navbar.scrolled{box-shadow:var(--shadow);background:rgba(255,255,255,0.95)}
.nav-container{
    display:flex;align-items:center;justify-content:space-between;
    height:100%;
}

/* Logo */
.nav-logo{
    display:flex;align-items:center;gap:10px;
    text-decoration:none;color:var(--c-text);font-weight:700;font-size:1.35rem;
}
.logo-icon{
    display:inline-flex;align-items:center;justify-content:center;
    width:36px;height:36px;
    background:linear-gradient(135deg,var(--c-primary),var(--c-accent));
    color:#fff;border-radius:8px;
    font-size:0.85rem;font-weight:800;letter-spacing:1px;
}
.logo-accent{color:var(--c-primary)}

/* Nav Links */
.nav-links{display:flex;list-style:none;gap:4px}
.nav-link{
    display:block;padding:8px 16px;
    color:var(--c-text-secondary);text-decoration:none;font-size:0.9rem;font-weight:500;
    border-radius:var(--radius-sm);
    transition:var(--t-fast);
}
.nav-link:hover{color:var(--c-primary);background:rgba(37,99,235,0.08)}

/* Mobile toggle */
.nav-mobile-btn{
    display:none;flex-direction:column;gap:5px;
    background:none;border:none;cursor:pointer;padding:4px;
}
.nav-mobile-btn span{
    display:block;width:24px;height:2px;
    background:var(--c-text);border-radius:2px;
    transition:var(--t-fast);
}

/* ---------- Hero ---------- */
.hero{
    position:relative;
    min-height:100vh;
    display:flex;align-items:center;
    padding:calc(var(--nav-h) + 40px) 0 60px;
    background:linear-gradient(135deg,#f0f7ff 0%,#f8fafc 50%,#f0fdf4 100%);
    overflow:hidden;
}
.hero-bg{
    position:absolute;inset:0;
    background:
        radial-gradient(ellipse 600px 400px at 20% 50%, rgba(37,99,235,0.08) 0%, transparent 70%),
        radial-gradient(ellipse 500px 300px at 80% 30%, rgba(14,165,233,0.06) 0%, transparent 70%),
        radial-gradient(ellipse 400px 300px at 60% 80%, rgba(6,182,212,0.05) 0%, transparent 70%);
    pointer-events:none;
}
.hero-container{
    position:relative;
    display:grid;grid-template-columns:1.3fr 1fr;
    gap:60px;align-items:center;
}
.hero-badge{
    display:inline-block;
    padding:6px 16px;
    background:rgba(37,99,235,0.1);
    color:var(--c-primary);
    font-size:0.85rem;font-weight:600;
    border-radius:100px;
    margin-bottom:24px;
}
.hero-title{
    font-size:clamp(2.2rem,5vw,3.6rem);
    font-weight:800;
    line-height:1.2;
    margin-bottom:20px;
}
.gradient-text{
    background:linear-gradient(135deg,var(--c-primary),var(--c-accent),var(--c-secondary));
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    background-clip:text;
}
.hero-subtitle{
    font-size:1.1rem;
    color:var(--c-text-secondary);
    line-height:1.7;
    margin-bottom:32px;
    max-width:540px;
}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}

/* Hero Stats */
.hero-stats{
    display:grid;grid-template-columns:1fr 1fr;
    gap:16px;
}
.stat-card{
    padding:24px 20px;
    background:rgba(255,255,255,0.7);
    backdrop-filter:blur(8px);
    border:1px solid rgba(37,99,235,0.1);
    border-radius:var(--radius);
    text-align:center;
}
.stat-card:hover{border-color:rgba(37,99,235,0.3);transform:translateY(-2px);transition:var(--t-normal)}
.stat-number{
    display:block;
    font-size:2.2rem;font-weight:800;
    background:linear-gradient(135deg,var(--c-primary),var(--c-accent));
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    background-clip:text;
}
.stat-label{font-size:0.85rem;color:var(--c-text-secondary);margin-top:4px;display:block}

/* ---------- Buttons ---------- */
.btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:12px 28px;
    font-size:0.95rem;font-weight:600;
    border-radius:var(--radius-sm);
    text-decoration:none;
    cursor:pointer;
    transition:var(--t-fast);
    border:2px solid transparent;
}
.btn-primary{
    background:linear-gradient(135deg,var(--c-primary),var(--c-accent));
    color:#fff;
    box-shadow:var(--shadow-sm);
}
.btn-primary:hover{
    transform:translateY(-1px);
    box-shadow:var(--shadow-glow);
}
.btn-secondary{
    background:rgba(255,255,255,0.8);
    color:var(--c-text);
    border-color:var(--c-border);
}
.btn-secondary:hover{
    border-color:var(--c-primary);
    color:var(--c-primary);
    background:#fff;
}
.btn-outline{
    background:transparent;
    color:var(--c-text-dark);
    border-color:rgba(255,255,255,0.3);
}
.btn-outline:hover{
    border-color:#fff;
    background:rgba(255,255,255,0.1);
}
.btn-lg{padding:14px 36px;font-size:1.05rem}

/* ---------- Sections ---------- */
.section{padding:100px 0}
.section-dark{background:var(--c-bg-dark);color:var(--c-text-dark)}
.section-header{
    text-align:center;
    max-width:700px;
    margin:0 auto 60px;
}
.section-tag{
    display:inline-block;
    padding:4px 14px;
    background:rgba(37,99,235,0.1);
    color:var(--c-primary);
    font-size:0.8rem;font-weight:600;
    border-radius:100px;
    margin-bottom:16px;
    text-transform:uppercase;letter-spacing:1px;
}
.section-dark .section-tag{background:rgba(147,197,253,0.15);color:var(--c-primary-light)}
.section-title{
    font-size:clamp(1.8rem,3.5vw,2.6rem);
    font-weight:800;
    margin-bottom:16px;
}
.section-dark .section-title{color:var(--c-text-dark)}
.section-desc{color:var(--c-text-secondary);font-size:1.05rem}
.section-dark .section-desc{color:var(--c-text-dark-secondary)}
/* Tech stack: extra vertical breathing room */
/* Tech stack: visual separator from adjacent sections */
#techstack{border-top:1px solid var(--c-border);padding-top:80px;margin-top:0}
#techstack .section-header{margin-bottom:48px}

/* ---------- Features Grid ---------- */
.features-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(340px,1fr));
    gap:24px;
}
.feature-card{
    padding:32px 28px;
    background:var(--c-bg);
    border:1px solid var(--c-border);
    border-radius:var(--radius);
    transition:var(--t-normal);
    position:relative;
    overflow:hidden;
}
.feature-card::before{
    content:'';position:absolute;top:0;left:0;right:0;height:3px;
    background:linear-gradient(90deg,var(--c-primary),var(--c-accent));
    opacity:0;
    transition:var(--t-normal);
}
.feature-card:hover{
    transform:translateY(-4px);
    box-shadow:var(--shadow-lg);
    border-color:var(--c-primary-light);
}
.feature-card:hover::before{opacity:1}
.feature-icon{
    width:52px;height:52px;border-radius:12px;
    display:inline-flex;align-items:center;justify-content:center;
    background:var(--icon-bg);color:var(--icon-color);
    margin-bottom:20px;
}
.feature-icon svg{width:26px;height:26px}
.feature-card h3{font-size:1.2rem;font-weight:700;margin-bottom:12px}
.feature-card p{font-size:0.92rem;color:var(--c-text-secondary);line-height:1.6;margin-bottom:16px}
.feature-detail{list-style:none;display:flex;flex-direction:column;gap:6px}
.feature-detail li{
    font-size:0.85rem;color:var(--c-text-secondary);
    padding-left:18px;
    position:relative;
}
.feature-detail li::before{
    content:'→';
    position:absolute;left:0;
    color:var(--c-primary);
    font-weight:600;
}

/* ---------- Comparison Table ---------- */
.comparison-wrapper{
    background:rgba(255,255,255,0.04);
    border:1px solid var(--c-border-dark);
    border-radius:var(--radius-lg);
    padding:32px;
    overflow:hidden;
}
.comparison-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.comparison-table{
    width:100%;
    border-collapse:separate;
    border-spacing:0;
    font-size:0.88rem;
    min-width:900px;
}
.comparison-table th,.comparison-table td{
    padding:14px 16px;
    text-align:left;
    border-bottom:1px solid var(--c-border-dark);
    white-space:nowrap;
}
.comparison-table thead th{
    background:rgba(37,99,235,0.08);
    color:var(--c-text-dark);
    font-weight:700;
    font-size:0.85rem;
    position:sticky;top:0;
}
.comparison-table thead th:first-child{border-radius:8px 0 0 0}
.comparison-table thead th:last-child{border-radius:0 8px 0 0}
.comparison-table tbody tr:hover{background:rgba(255,255,255,0.03)}
.comparison-table tbody tr:last-child td{border-bottom:none}
.col-feature{
    font-weight:600;
    color:var(--c-text-dark);
    min-width:130px;
}
.highlight-col{
    background:rgba(37,99,235,0.06);
    border-left:3px solid var(--c-primary);
}
.check{color:var(--c-success);font-weight:700}
.cross{color:var(--c-danger);font-weight:700}
.badge{
    display:inline-block;
    padding:3px 10px;
    border-radius:100px;
    font-size:0.78rem;
    font-weight:600;
}
.badge-primary{background:rgba(37,99,235,0.2);color:var(--c-primary-light)}
.badge-success{background:rgba(16,185,129,0.2);color:var(--c-success)}
.badge-warn{background:rgba(245,158,11,0.2);color:var(--c-warning)}
.comparison-note{
    margin-top:24px;
    padding:20px 24px;
    background:rgba(37,99,235,0.06);
    border:1px solid rgba(37,99,235,0.15);
    border-radius:var(--radius-sm);
    font-size:0.92rem;
    color:var(--c-text-dark-secondary);
    line-height:1.7;
}

/* ---------- Tech Stack ---------- */
.tech-grid{display:flex;flex-direction:column;gap:28px}
.tech-category h3{
    font-size:1rem;font-weight:700;
    margin-bottom:14px;
    color:var(--c-primary);
}
.section-dark .tech-category h3{color:var(--c-primary-light)}
.tech-items{display:flex;flex-wrap:wrap;gap:10px}
.tech-badge{
    display:inline-flex;align-items:center;
    padding:8px 18px;
    background:var(--c-bg);
    color:var(--c-text);
    border:1px solid var(--c-border);
    border-radius:100px;
    font-size:0.88rem;font-weight:500;
    transition:var(--t-fast);
}
.tech-badge:hover{
    border-color:var(--c-primary);
    color:var(--c-primary);
    transform:translateY(-2px);
    box-shadow:var(--shadow-sm);
}
.section-dark .tech-badge{
    background:rgba(255,255,255,0.04);
    color:var(--c-text-dark);
    border-color:var(--c-border-dark);
}
.section-dark .tech-badge:hover{
    border-color:var(--c-primary-light);
    color:var(--c-primary-light);
}

/* ---------- Architecture Diagram ---------- */
.arch-diagram{
    max-width:700px;
    margin:0 auto 50px;
    position:relative;
}
.arch-layer{
    display:flex;align-items:center;gap:20px;
    padding:16px 0;
    position:relative;
}
.arch-layer-label{
    width:90px;
    font-size:0.82rem;font-weight:600;
    color:var(--c-text-dark-secondary);
    text-align:right;
    flex-shrink:0;
}
.arch-box-group{display:flex;flex-wrap:wrap;gap:10px;flex:1}
.arch-box{
    padding:12px 20px;
    border-radius:var(--radius-sm);
    font-size:0.85rem;font-weight:600;
    text-align:center;
    transition:var(--t-fast);
}
.arch-box:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.arch-gateway{
    background:linear-gradient(135deg,var(--c-primary),var(--c-accent));
    color:#fff;
    display:inline-block;
}
.arch-common{background:rgba(37,99,235,0.15);color:var(--c-primary-light);border:1px solid rgba(37,99,235,0.3)}
.arch-core{background:rgba(6,182,212,0.15);color:#67e8f9;border:1px solid rgba(6,182,212,0.3)}
.arch-auth{background:rgba(16,185,129,0.15);color:#6ee7b7;border:1px solid rgba(16,185,129,0.3)}
.arch-crud{background:rgba(37,99,235,0.15);color:var(--c-primary-light);border:1px solid rgba(37,99,235,0.3)}
.arch-app{background:rgba(14,165,233,0.15);color:#7dd3fc;border:1px solid rgba(14,165,233,0.3)}
.arch-flow{background:rgba(245,158,11,0.15);color:#fcd34d;border:1px solid rgba(245,158,11,0.3)}
.arch-ai{background:rgba(14,165,233,0.15);color:#7dd3fc;border:1px solid rgba(14,165,233,0.3)}
.arch-etl{background:rgba(16,185,129,0.15);color:#6ee7b7;border:1px solid rgba(16,185,129,0.3)}
.arch-notice{background:rgba(244,63,94,0.15);color:#fca5a5;border:1px solid rgba(244,63,94,0.3)}
.arch-job{background:rgba(14,165,233,0.15);color:#7dd3fc;border:1px solid rgba(14,165,233,0.3)}
.arch-magic{background:rgba(14,165,233,0.15);color:#7dd3fc;border:1px solid rgba(14,165,233,0.3)}
.arch-ui-pc{background:rgba(37,99,235,0.2);color:var(--c-primary-light);border:1px solid rgba(37,99,235,0.4)}
.arch-ui-mobile{background:rgba(6,182,212,0.2);color:#67e8f9;border:1px solid rgba(6,182,212,0.4)}
.arch-license{background:rgba(245,158,11,0.15);color:#fcd34d;border:1px solid rgba(245,158,11,0.3)}
.arch-arrow{
    display:flex;justify-content:center;
    color:var(--c-text-dark-secondary);
    opacity:0.5;
    padding:4px 0;
}

/* Module Grid */
.module-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
    gap:16px;
    max-width:900px;
    margin:0 auto;
}
.module-item{
    padding:18px 20px;
    background:rgba(255,255,255,0.03);
    border:1px solid var(--c-border-dark);
    border-radius:var(--radius-sm);
    transition:var(--t-fast);
}
.module-item:hover{background:rgba(255,255,255,0.06);transform:translateY(-2px)}
.module-item strong{display:block;font-size:0.95rem;color:var(--c-text-dark);margin-bottom:4px}
.module-item span{font-size:0.82rem;color:var(--c-text-dark-secondary)}

/* ---------- Core Difference Matrix ---------- */
.matrix-dimension{margin-bottom:40px}
.matrix-dim-header{display:flex;align-items:center;gap:14px;margin-bottom:20px}
.matrix-dim-badge{
    display:inline-flex;align-items:center;justify-content:center;
    padding:4px 14px;border-radius:100px;
    font-size:0.78rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;
    white-space:nowrap;
}
.dim-arch{background:rgba(37,99,235,0.15);color:var(--c-primary-light)}
.dim-ai{background:rgba(14,165,233,0.15);color:#7dd3fc}
.dim-data{background:rgba(16,185,129,0.15);color:#6ee7b7}
.dim-runtime{background:rgba(245,158,11,0.15);color:#fcd34d}
.dim-auth{background:rgba(6,182,212,0.15);color:#67e8f9}
.dim-license{background:rgba(244,63,94,0.15);color:#fca5a5}
.dim-message{background:rgba(14,165,233,0.15);color:#7dd3fc}
.dim-code{background:rgba(13,148,136,0.15);color:#6ee7b7}
.dim-ecosystem{background:rgba(251,146,60,0.15);color:#fdba74}
.matrix-dim-header h3{font-size:1.2rem;font-weight:700;margin:0}

.matrix-vs-row{
    display:grid;
    grid-template-columns:1fr auto 1fr;
    gap:24px;
    align-items:start;
}
.matrix-item{
    background:rgba(255,255,255,0.03);
    border:1px solid var(--c-border-dark);
    border-radius:var(--radius);
    padding:24px;
    transition:var(--t-fast);
}
.matrix-item:hover{background:rgba(255,255,255,0.06);transform:translateY(-2px)}
.matrix-center3{border-left:3px solid var(--c-primary)}
.matrix-competitor{border-left:3px solid var(--c-border-dark)}
.matrix-item-tag{
    display:inline-block;
    padding:2px 10px;
    border-radius:100px;
    font-size:0.75rem;font-weight:700;
    margin-bottom:10px;
    text-transform:uppercase;letter-spacing:0.5px;
}
.matrix-center3 .matrix-item-tag{background:rgba(37,99,235,0.2);color:var(--c-primary-light)}
.matrix-competitor .matrix-item-tag{background:rgba(255,255,255,0.06);color:var(--c-text-dark-secondary)}
.matrix-item h4{font-size:1rem;font-weight:700;color:var(--c-text);margin-bottom:10px}
.matrix-item p{font-size:0.88rem;color:var(--c-text-secondary);line-height:1.7}
.matrix-item .feature-detail{margin-top:12px}
.matrix-item .feature-detail li{color:var(--c-text-secondary);font-size:0.82rem}
.matrix-vs-divider{
    display:flex;align-items:center;justify-content:center;
    padding-top:60px;
}
.vs-badge{
    display:inline-flex;align-items:center;justify-content:center;
    width:44px;height:44px;
    border-radius:50%;
    background:var(--c-bg-dark-alt);
    border:2px solid var(--c-border-dark);
    color:var(--c-text-dark-secondary);
    font-size:0.75rem;font-weight:800;
    flex-shrink:0;
}
.highlight{color:var(--c-primary-light);font-weight:600}
.warn{color:var(--c-warning);font-weight:600}

/* Matrix Summary */
.matrix-summary{margin-top:20px}
.summary-card{
    display:flex;gap:20px;align-items:flex-start;
    padding:28px 32px;
    background:rgba(37,99,235,0.06);
    border:1px solid rgba(37,99,235,0.2);
    border-radius:var(--radius-lg);
}
.summary-icon{
    width:52px;height:52px;border-radius:50%;
    background:rgba(37,99,235,0.15);
    color:var(--c-primary-light);
    display:flex;align-items:center;justify-content:center;
    flex-shrink:0;
}
.summary-content h4{font-size:1.1rem;font-weight:700;color:var(--c-text-dark);margin-bottom:8px}
.summary-content p{font-size:0.9rem;color:var(--c-text-dark-secondary);line-height:1.7}
.summary-tagline{
    margin-top:14px;
    padding:12px 16px;
    background:rgba(37,99,235,0.08);
    border-radius:var(--radius-sm);
    font-style:italic;
    border-left:3px solid var(--c-primary);
}

.matrix-dimension,.summary-card{
    opacity:0;transform:translateY(30px);
    transition:opacity 0.6s ease,transform 0.6s ease;
}
.matrix-dimension.visible,.summary-card.visible{opacity:1;transform:translateY(0)}

/* ---------- Module Structure ---------- */
#modules{background:var(--c-bg-alt)}
.module-layer{
    display:flex;gap:20px;
    margin-bottom:16px;
    position:relative;
}
.module-layer::before{
    content:'';position:absolute;left:150px;top:34px;bottom:0;
    width:2px;background:var(--c-border);
}
.module-layer:last-child{margin-bottom:0}
.module-layer:last-child::before{display:none}
.layer-left{
    width:130px;flex-shrink:0;
    display:flex;flex-direction:column;gap:6px;
    padding-top:6px;
}
.layer-badge{
    display:inline-flex;align-items:center;justify-content:center;
    padding:4px 12px;border-radius:100px;
    font-size:0.78rem;font-weight:700;letter-spacing:0.5px;
    width:fit-content;
}
.layer-label{
    font-size:0.78rem;color:var(--c-text-tertiary, #94a3b8);
    line-height:1.4;
}
.layer-cards{
    flex:1;min-width:0;
    display:flex;flex-wrap:wrap;gap:10px;
    padding-left:20px;
    position:relative;
}
.layer-cards::before{
    content:'';position:absolute;left:0;top:34px;
    width:12px;height:2px;background:var(--c-border);
}
.mod-card{
    display:flex;align-items:flex-start;gap:12px;
    padding:14px 16px;
    background:var(--c-bg);
    border:1px solid var(--c-border);
    border-radius:var(--radius-sm);
    width:calc(50% - 5px);
    min-width:280px;
    transition:var(--t-fast);
}
.mod-card:hover{box-shadow:var(--shadow);border-color:var(--c-primary-light);transform:translateY(-1px)}
.mod-highlight{border-left:3px solid var(--c-primary)}
.mod-icon{
    width:36px;height:36px;border-radius:8px;
    background:var(--c-bg-alt);
    display:flex;align-items:center;justify-content:center;
    flex-shrink:0;
}
.mod-icon svg{width:18px;height:18px}
.mod-body{flex:1;min-width:0}
.mod-body strong{display:block;font-size:0.92rem;font-weight:600;color:var(--c-text);margin-bottom:3px}
.mod-body span{font-size:0.8rem;color:var(--c-text-secondary);line-height:1.5;display:block}
.mod-size{display:none}
.mod-web{width:100%;max-width:400px}
.mod-web .mod-body strong{font-size:1rem}
.module-layer,.mod-card{opacity:0;transform:translateY(20px);transition:opacity 0.5s ease,transform 0.5s ease}
.module-layer.visible,.mod-card.visible{opacity:1;transform:translateY(0)}

/* ---------- By the Numbers ---------- */
.numbers-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
    gap:24px;
}
.number-card{
    padding:28px 24px;
    background:var(--c-bg);
    border:1px solid var(--c-border);
    border-radius:var(--radius);
    text-align:center;
    transition:var(--t-normal);
    position:relative;
    overflow:hidden;
}
.number-card::before{
    content:'';position:absolute;top:0;left:0;right:0;height:3px;
    background:linear-gradient(90deg,var(--c-primary),var(--c-accent));
    opacity:0;
    transition:var(--t-normal);
}
.number-card:hover{
    transform:translateY(-4px);
    box-shadow:var(--shadow-lg);
    border-color:var(--c-primary-light);
}
.number-card:hover::before{opacity:1}
.number-value{
    display:inline-block;
    font-size:2.4rem;font-weight:800;
    background:linear-gradient(135deg,var(--c-primary),var(--c-accent));
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    background-clip:text;
}
.number-unit{
    font-size:1rem;font-weight:600;
    color:var(--c-text-secondary);
    margin-left:4px;
}
.number-label{
    display:block;
    font-size:0.92rem;font-weight:600;
    color:var(--c-text);
    margin:8px 0 6px;
}
.number-desc{
    font-size:0.82rem;
    color:var(--c-text-secondary);
    line-height:1.5;
}
.number-card{opacity:0;transform:translateY(30px);transition:opacity 0.6s ease,transform 0.6s ease}
.number-card.visible{opacity:1;transform:translateY(0)}

/* ---------- Use Cases ---------- */
.usecases-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(320px,1fr));
    gap:24px;
}
.usecase-card{
    padding:32px 28px;
    background:var(--c-bg);
    border:1px solid var(--c-border);
    border-radius:var(--radius);
    transition:var(--t-normal);
}
.usecase-card:hover{
    transform:translateY(-4px);
    box-shadow:var(--shadow-lg);
    border-color:var(--c-primary-light);
}
.usecase-icon{
    width:52px;height:52px;border-radius:12px;
    display:inline-flex;align-items:center;justify-content:center;
    background:var(--uc-bg);
    margin-bottom:20px;
}
.usecase-icon svg{width:26px;height:26px}
.usecase-card h3{font-size:1.15rem;font-weight:700;margin-bottom:10px;color:var(--c-text)}
.usecase-card p{font-size:0.9rem;color:var(--c-text-secondary);line-height:1.6;}

/* ---------- CTA ---------- */
.cta-section{background:linear-gradient(135deg,var(--c-primary-dark),var(--c-bg-dark),#0f172a)}
.cta-box{
    text-align:center;
    padding:60px 40px;
    border-radius:var(--radius-lg);
}
.cta-box h2{
    font-size:clamp(1.6rem,3vw,2.2rem);
    font-weight:800;
    color:#fff;
    margin-bottom:12px;
}
.cta-box p{
    color:rgba(255,255,255,0.7);
    font-size:1.1rem;
    margin-bottom:28px;
}
.cta-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ---------- Footer ---------- */
.footer{
    background:var(--c-bg-dark-alt);
    color:var(--c-text-dark);
    padding:60px 0 30px;
}
.footer-grid{
    display:grid;
    grid-template-columns:2fr 1fr 1fr;
    gap:40px;
    margin-bottom:40px;
}
.footer-brand .logo-icon{margin-bottom:16px}
.footer-brand .logo-text{font-size:1.3rem;font-weight:700;color:var(--c-text-dark);vertical-align:middle;margin-left:8px}
.footer-brand p{margin-top:12px;font-size:0.88rem;color:var(--c-text-dark-secondary);line-height:1.6}
.footer-links h4{font-size:0.95rem;font-weight:700;margin-bottom:16px;color:var(--c-text-dark)}
.footer-links a{
    display:block;
    color:var(--c-text-dark-secondary);
    text-decoration:none;
    font-size:0.88rem;
    padding:4px 0;
    transition:var(--t-fast);
}
.footer-links a:hover{color:var(--c-primary-light)}
.footer-bottom{
    border-top:1px solid var(--c-border-dark);
    padding-top:20px;
    text-align:center;
    font-size:0.82rem;
    color:var(--c-text-dark-secondary);
}

/* ---------- Scroll Top ---------- */
.scroll-top{
    position:fixed;bottom:30px;right:30px;
    width:44px;height:44px;
    border-radius:50%;
    background:var(--c-primary);
    color:#fff;
    border:none;
    cursor:pointer;
    display:flex;align-items:center;justify-content:center;
    opacity:0;visibility:hidden;
    transform:translateY(12px);
    transition:var(--t-normal);
    box-shadow:var(--shadow);
    z-index:999;
}
.scroll-top.visible{opacity:1;visibility:visible;transform:translateY(0)}
.scroll-top:hover{transform:translateY(-2px);box-shadow:var(--shadow-glow)}

/* ---------- Animations ---------- */
@keyframes fadeInUp{
    from{opacity:0;transform:translateY(30px)}
    to{opacity:1;transform:translateY(0)}
}
@keyframes fadeIn{
    from{opacity:0}to{opacity:1}
}
.animate-in{
    animation:fadeInUp 0.6s ease forwards;
}
.feature-card,.usecase-card,.module-item,.tech-category{
    opacity:0;transform:translateY(30px);
    transition:opacity 0.6s ease,transform 0.6s ease;
}
.feature-card.visible,.usecase-card.visible,.module-item.visible,.tech-category.visible{
    opacity:1;transform:translateY(0);
}

/* ---------- Responsive ---------- */
@media(max-width:1024px){
    .hero-container{grid-template-columns:1fr;gap:40px}
    .hero-stats{max-width:400px}
    .footer-grid{grid-template-columns:1fr 1fr}
}

@media(max-width:768px){
    .nav-links{
        position:fixed;top:var(--nav-h);left:0;right:0;
        flex-direction:column;
        background:rgba(255,255,255,0.98);
        backdrop-filter:blur(16px);
        border-bottom:1px solid var(--c-border);
        padding:16px;
        gap:4px;
        transform:translateY(-110%);
        transition:var(--t-normal);
        opacity:0;
    }
    .nav-links.open{transform:translateY(0);opacity:1}
    .nav-mobile-btn{display:flex}
    .section{padding:60px 0}
    .features-grid,.usecases-grid{grid-template-columns:1fr}
    .comparison-wrapper{padding:16px;margin:0 -12px;border-radius:0}
    .hero-subtitle{font-size:1rem}
    .hero-stats{grid-template-columns:1fr 1fr;gap:12px}
    .stat-card{padding:16px}
    .stat-number{font-size:1.8rem}
    .arch-layer{flex-direction:column;align-items:flex-start;gap:10px}
    .arch-layer-label{width:auto;text-align:left}
    .footer-grid{grid-template-columns:1fr}
    .tech-grid{gap:20px}
}
@media(max-width:768px){
    .module-layer{flex-direction:column;gap:12px}
    .module-layer::before{display:none}
    .layer-left{width:auto;flex-direction:row;align-items:center;gap:10px}
    .layer-cards{padding-left:0}
    .layer-cards::before{display:none}
    .mod-card{width:100%;min-width:0}
}

@media(max-width:480px){
    .hero-title{font-size:1.8rem}
    .section-title{font-size:1.5rem}
    .btn{padding:10px 20px;font-size:0.85rem}
    .btn-lg{padding:12px 28px;font-size:0.95rem}
    .stat-number{font-size:1.5rem}
}

/* ---------- Reduced Motion ---------- */
@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}
}