:root {
    --color-primary: #334155;
    --color-primary-dark: #0f172a;
    --color-accent: #3b82f6;
    --color-surface: #ffffff;
    --color-text: #0b1220;
    --rgb-primary: 51,65,85;
    --rgb-accent: 59,130,246;
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 0 rgba(15,23,42,.08), 0 10px 18px rgba(2,6,23,.06);
    --shadow-md: 0 14px 34px rgba(2,6,23,.10), 0 2px 0 rgba(15,23,42,.06);
    --shadow-lg: 0 22px 60px rgba(2,6,23,.16), 0 0 0 1px rgba(59,130,246,.14);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 220ms cubic-bezier(0.2, 0.85, 0.2, 1);
    --heading-weight: 650;
    --body-line-height: 1.6;
    --card-border: rgba(51,65,85,.18);
    --card-glow: rgba(59,130,246,.35);
    --card-halo: rgba(59,130,246,.55);
    --text-muted: rgba(15,23,42,.72);
}

body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(900px 420px at 15% 0%, rgba(59,130,246,.12), transparent 55%), radial-gradient(820px 480px at 90% 10%, rgba(15,23,42,.35), transparent 60%), linear-gradient(180deg, #0b1220 0%, #0f172a 55%, #0b1220 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 1px 0 rgba(255,255,255,.10) inset,
        0 18px 48px rgba(2,6,23,.22),
        0 10px 20px rgba(2,6,23,.12),
        0 0 0 1px rgba(51,65,85,.16);
    padding: var(--space-card);
    transition:
        transform 260ms cubic-bezier(0.2, 0.85, 0.2, 1),
        box-shadow 260ms cubic-bezier(0.2, 0.85, 0.2, 1),
        border-color 220ms cubic-bezier(0.2, 0.85, 0.2, 1),
        filter 220ms cubic-bezier(0.2, 0.85, 0.2, 1);
    background:
        radial-gradient(120% 90% at 0% 0%, rgba(59,130,246,.10), transparent 52%),
        radial-gradient(90% 70% at 100% 0%, rgba(51,65,85,.18), transparent 55%),
        linear-gradient(180deg, rgba(255,255,255,.98) 0%, rgba(245,247,250,.96) 100%);
    border: 1px solid rgba(59,130,246,.08);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform 200ms cubic-bezier(0.2, 0.85, 0.2, 1), background-color 220ms cubic-bezier(0.2, 0.85, 0.2, 1), box-shadow 220ms cubic-bezier(0.2, 0.85, 0.2, 1), border-color 220ms cubic-bezier(0.2, 0.85, 0.2, 1);
    box-shadow: 0 10px 22px rgba(2,6,23,.12), 0 0 0 1px rgba(51,65,85,.18);
}
a:not([class]) { color: #93c5fd; transition: color var(--transition), text-shadow 240ms cubic-bezier(0.2, 0.85, 0.2, 1); }
section, .section { background: transparent; }
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 420px at 20% 10%, rgba(59,130,246,.20), transparent 55%),
        radial-gradient(760px 380px at 85% 20%, rgba(56,189,248,.14), transparent 60%),
        linear-gradient(135deg, #1e293b 0%, #0f172a 45%, #0b1220 100%);
    border-radius: var(--radius-xl);
}
.card { border: 1px solid rgba(59,130,246,.14); }

@keyframes glowPulse {
    0% { box-shadow: 0 1px 0 rgba(255,255,255,.10) inset, 0 18px 48px rgba(2,6,23,.22), 0 10px 20px rgba(2,6,23,.12), 0 0 0 1px rgba(51,65,85,.16); }
    45% { box-shadow: 0 1px 0 rgba(255,255,255,.12) inset, 0 18px 48px rgba(2,6,23,.22), 0 10px 20px rgba(2,6,23,.12), 0 0 0 1px rgba(59,130,246,.26), 0 0 32px rgba(59,130,246,.22); }
    100% { box-shadow: 0 1px 0 rgba(255,255,255,.10) inset, 0 18px 48px rgba(2,6,23,.22), 0 10px 20px rgba(2,6,23,.12), 0 0 0 1px rgba(51,65,85,.16); }
}

/* ========== Section Layout Variants ========== */

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; text-shadow: 0 1px 0 rgba(255,255,255,.14), 0 0 28px rgba(59,130,246,.16); }

/* cta: card-style */
.cta-inner { background: linear-gradient(180deg, rgba(255,255,255,.98) 0%, rgba(241,245,249,.98) 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 18px 60px rgba(2,6,23,.22), 0 0 0 1px rgba(59,130,246,.18); }

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 1px 0 rgba(255,255,255,.12) inset,
        0 28px 80px rgba(2,6,23,.26),
        0 14px 26px rgba(2,6,23,.16),
        0 0 0 1px rgba(59,130,246,.28),
        0 0 32px rgba(59,130,246,.40),
        0 0 64px rgba(59,130,246,.18);
    filter: saturate(1.04) contrast(1.02);
}
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 18px rgba(59,130,246,.40); }
.card { outline: 1px solid rgba(255,255,255,.20); outline-offset: -1px; }
.card:hover { animation: glowPulse 1.35s ease-in-out infinite; }

a:focus, button:focus, .btn:focus { outline: 2px solid rgba(59,130,246,.55); outline-offset: 2px; }

/* caret/accent */
input, textarea, select { caret-color: var(--color-accent); accent-color: var(--color-accent); }

/* Responsive */
@media (max-width: 1024px) {
    .news-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .feature-list { grid-template-columns: repeat(2, 1fr) !important; }
    .partner-grid { grid-template-columns: repeat(3, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .hero-inner { grid-template-columns: 1fr !important; }
}
@media (max-width: 640px) {
    :root { --space-section: 2rem; --space-card: 1rem; --space-gap: 0.75rem; }
    .news-grid { grid-template-columns: 1fr !important; }
    .feature-list { grid-template-columns: 1fr !important; }
    .faq-list { grid-template-columns: 1fr !important; }
    .testimonial-list { column-count: 1 !important; }
    .partner-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .cta-inner { grid-template-columns: 1fr !important; }
    .card:hover, [class*="card"]:hover { transform: translateY(-4px); }
}