/* =====================================================
   Novara AI Model Hub — 首页样式
   9 套主题：light / green / dark / green-dark / infinite /
             violet / honey / midnight / chasing
   每次刷新由后端随机分配主题到 body 与 html data-theme
   ===================================================== */

:root {
    --font-main: 'Inter', "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all .35s ease;
}

/* ---------- 主题变量 ---------- */
[data-theme="light"] {
    --bg: #f7f9ff;
    --bg-hero: #eef2ff;
    --text: #0f172a;
    --text-muted: #475569;
    --accent: #4f46e5;
    --accent-2: #7c3aed;
    --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    --card-bg: rgba(255,255,255,0.85);
    --card-border: rgba(15,23,42,0.06);
    --card-shadow: 0 20px 50px rgba(15,23,42,0.08);
    --footer-bg: #0f172a;
    --footer-text: #94a3b8;
    --orb-1: rgba(79,70,229,0.25);
    --orb-2: rgba(124,58,237,0.18);
}

[data-theme="green"] {
    --bg: #effef6;
    --bg-hero: #dcfce7;
    --text: #0f2416;
    --text-muted: #3f6248;
    --accent: #16a34a;
    --accent-2: #22c55e;
    --accent-gradient: linear-gradient(135deg, #16a34a 0%, #22c55e 100%);
    --card-bg: rgba(255,255,255,0.88);
    --card-border: rgba(22,163,74,0.08);
    --card-shadow: 0 20px 50px rgba(22,163,74,0.10);
    --footer-bg: #0f2416;
    --footer-text: #86efac;
    --orb-1: rgba(34,197,94,0.28);
    --orb-2: rgba(22,163,74,0.18);
}

[data-theme="dark"] {
    --bg: #0f0f12;
    --bg-hero: #18181b;
    --text: #f8fafc;
    --text-muted: #a1a1aa;
    --accent: #38bdf8;
    --accent-2: #818cf8;
    --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    --card-bg: rgba(255,255,255,0.06);
    --card-border: rgba(255,255,255,0.08);
    --card-shadow: 0 20px 50px rgba(0,0,0,0.40);
    --footer-bg: #000;
    --footer-text: #71717a;
    --orb-1: rgba(56,189,248,0.20);
    --orb-2: rgba(129,140,248,0.14);
}

[data-theme="green-dark"] {
    --bg: #07140d;
    --bg-hero: #0c1f15;
    --text: #ecfdf5;
    --text-muted: #86efac;
    --accent: #10b981;
    --accent-2: #34d399;
    --accent-gradient: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --card-bg: rgba(255,255,255,0.05);
    --card-border: rgba(255,255,255,0.07);
    --card-shadow: 0 20px 50px rgba(0,0,0,0.45);
    --footer-bg: #020804;
    --footer-text: #6ee7b7;
    --orb-1: rgba(16,185,129,0.22);
    --orb-2: rgba(52,211,153,0.14);
}

[data-theme="infinite"] {
    --bg: #0b0f19;
    --bg-hero: #0f172a;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #f59e0b;
    --accent-2: #f97316;
    --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
    --card-bg: rgba(255,255,255,0.04);
    --card-border: rgba(255,255,255,0.06);
    --card-shadow: 0 20px 60px rgba(245,158,11,0.15);
    --footer-bg: #020617;
    --footer-text: #64748b;
    --orb-1: rgba(245,158,11,0.20);
    --orb-2: rgba(249,115,22,0.14);
}

[data-theme="violet"] {
    --bg: #1a1033;
    --bg-hero: #2a1a4a;
    --text: #f3e8ff;
    --text-muted: #d8b4fe;
    --accent: #d946ef;
    --accent-2: #a855f7;
    --accent-gradient: linear-gradient(135deg, #d946ef 0%, #a855f7 100%);
    --card-bg: rgba(255,255,255,0.06);
    --card-border: rgba(255,255,255,0.08);
    --card-shadow: 0 20px 50px rgba(168,85,247,0.25);
    --footer-bg: #110824;
    --footer-text: #c084fc;
    --orb-1: rgba(217,70,239,0.22);
    --orb-2: rgba(168,85,247,0.16);
}

[data-theme="honey"] {
    --bg: #fffbeb;
    --bg-hero: #fef3c7;
    --text: #451a03;
    --text-muted: #92400e;
    --accent: #d97706;
    --accent-2: #f59e0b;
    --accent-gradient: linear-gradient(135deg, #d97706 0%, #f59e0b 100%);
    --card-bg: rgba(255,255,255,0.85);
    --card-border: rgba(217,119,6,0.10);
    --card-shadow: 0 20px 50px rgba(217,119,6,0.12);
    --footer-bg: #451a03;
    --footer-text: #fde68a;
    --orb-1: rgba(245,158,11,0.25);
    --orb-2: rgba(217,119,6,0.18);
}

[data-theme="midnight"] {
    --bg: #020617;
    --bg-hero: #0b1221;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #60a5fa;
    --accent-2: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    --card-bg: rgba(255,255,255,0.04);
    --card-border: rgba(255,255,255,0.06);
    --card-shadow: 0 20px 60px rgba(59,130,246,0.18);
    --footer-bg: #00060e;
    --footer-text: #60a5fa;
    --orb-1: rgba(96,165,250,0.18);
    --orb-2: rgba(37,99,235,0.12);
}

[data-theme="chasing"] {
    --bg: #0a0a0a;
    --bg-hero: #111111;
    --text: #ffffff;
    --text-muted: #a3a3a3;
    --accent: #ef4444;
    --accent-2: #ec4899;
    --accent-gradient: linear-gradient(135deg, #ef4444 0%, #ec4899 100%);
    --card-bg: rgba(255,255,255,0.05);
    --card-border: rgba(255,255,255,0.07);
    --card-shadow: 0 20px 60px rgba(239,68,68,0.20);
    --footer-bg: #000;
    --footer-text: #fca5a5;
    --orb-1: rgba(239,68,68,0.20);
    --orb-2: rgba(236,72,153,0.14);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: var(--font-main);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: var(--transition);
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: var(--transition); }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 噪点纹理 ---------- */
.grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: .04;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* ---------- 导航 ---------- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 18px 0;
    backdrop-filter: blur(12px);
    background: rgba(var(--bg), 0.75);
    border-bottom: 1px solid var(--card-border);
    transition: var(--transition);
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}
.brand-icon {
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 10px;
    background: var(--accent-gradient);
    color: #fff;
    font-size: 18px;
    animation: spin-slow 12s linear infinite;
}
@keyframes spin-slow { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
    margin: 0; padding: 0;
}
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-muted); }
.nav-links a:hover { color: var(--accent); }
.btn-ghost {
    padding: 8px 18px;
    border-radius: 999px;
    border: 1px solid var(--card-border);
    font-weight: 600;
    color: var(--text) !important;
    background: var(--card-bg);
}
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-2px); }

/* ---------- Hero ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--bg-hero);
    transition: var(--transition);
}
.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, var(--orb-1) 0%, transparent 45%),
        radial-gradient(circle at 80% 70%, var(--orb-2) 0%, transparent 45%);
    transition: var(--transition);
}
.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    transition: var(--transition);
}
.orb-1 { width: 500px; height: 500px; top: -120px; left: -80px; background: var(--orb-1); animation: float 8s ease-in-out infinite alternate; }
.orb-2 { width: 360px; height: 360px; bottom: -80px; right: -60px; background: var(--orb-2); animation: float 10s ease-in-out infinite alternate-reverse; }
@keyframes float { from { transform: translate(0, 0); } to { transform: translate(30px, -40px); } }

.hero-inner {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 120px 0 80px;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 999px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 28px;
}
.pulse-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(1.4)} }

.hero-title {
    font-size: clamp(42px, 7vw, 82px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin: 0 0 24px;
}
.hero-title .gradient-text {
    display: block;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.hero-title-line { display: block; color: var(--text); }
.hero-desc {
    max-width: 640px;
    margin: 0 auto 36px;
    font-size: 18px;
    color: var(--text-muted);
    line-height: 1.7;
}
.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 56px;
}
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 30px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
}
.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 12px 30px rgba(0,0,0,0.18);
    border: none;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 18px 40px rgba(0,0,0,0.22); }
.btn-secondary {
    background: var(--card-bg);
    color: var(--text);
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
}
.btn-secondary:hover { transform: translateY(-3px); border-color: var(--accent); }

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 56px;
    flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-num {
    display: block;
    font-size: 42px;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1;
}
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 6px; display: block; }

/* ---------- Features ---------- */
.features, .models, .cta { padding: 100px 0; transition: var(--transition); }
.features { background: var(--bg); }
.models { background: var(--bg-hero); }

.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: var(--accent-gradient);
    color: #fff;
    margin-bottom: 16px;
}
.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    margin: 0 0 14px;
    color: var(--text);
}
.section-desc { color: var(--text-muted); font-size: 17px; max-width: 560px; margin: 0 auto; }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.feature-card {
    padding: 32px;
    border-radius: 20px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}
.feature-card:hover { transform: translateY(-6px); border-color: var(--accent); }
.feature-icon {
    width: 52px; height: 52px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 14px;
    background: var(--accent-gradient);
    color: #fff;
    font-size: 22px;
    margin-bottom: 20px;
}
.feature-card h3 { font-size: 20px; font-weight: 700; margin: 0 0 10px; color: var(--text); }
.feature-card p { margin: 0; font-size: 15px; color: var(--text-muted); line-height: 1.65; }

/* ---------- Models ---------- */
.model-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
}
.model-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 999px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    transition: var(--transition);
}
.model-tag i { color: var(--accent); font-size: 12px; }
.model-tag:hover { transform: translateY(-3px); border-color: var(--accent); color: var(--accent); }

/* ---------- CTA ---------- */
.cta { background: var(--bg); }
.cta-card {
    position: relative;
    overflow: hidden;
    text-align: center;
    padding: 64px 40px;
    border-radius: 28px;
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 30px 80px rgba(0,0,0,0.25);
}
.cta-card h2 { font-size: clamp(26px, 3.5vw, 38px); font-weight: 800; margin: 0 0 12px; }
.cta-card p { font-size: 17px; opacity: 0.92; margin: 0 0 28px; }
.cta-card .btn-primary { background: #fff; color: var(--accent); }

/* ---------- Footer ---------- */
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 28px 0;
    text-align: center;
    font-size: 14px;
    transition: var(--transition);
}
.footer a { color: var(--accent); text-decoration: underline; }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .navbar .container { padding: 0 18px; }
    .nav-links { gap: 16px; }
    .nav-links li:not(:last-child) { display: none; }
    .hero-inner { padding: 140px 0 60px; }
    .hero-stats { gap: 30px; }
    .stat-num { font-size: 32px; }
    .features, .models, .cta { padding: 70px 0; }
    .feature-grid { grid-template-columns: 1fr; }
    .feature-card { padding: 24px; }
    .cta-card { padding: 44px 24px; }
}

@media (prefers-reduced-motion: reduce) {
    .brand-icon, .orb-1, .orb-2, .pulse-dot { animation: none; }
}