:root {
    --color-primary: #334155;
    --color-primary-dark: #0f172a;
    --color-accent: #3b82f6;
    --color-surface: #0f172a;
    --color-card: #ffffff;
    --color-text: #e2e8f0;
    --color-text-inverse: #0f172a;
    --rgb-primary: 51,65,85;
    --rgb-accent: 59,130,246;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px 0 rgba(15,23,42,0.2), 0 0 8px 1px rgba(var(--rgb-accent), 0.12);
    --shadow-md: 0 8px 16px -4px rgba(15,23,42,0.3), 0 0 24px 2px rgba(var(--rgb-accent), 0.35);
    --shadow-lg: 0 16px 32px -8px rgba(15,23,42,0.4), 0 0 32px 4px rgba(var(--rgb-accent), 0.6);
    --space-section: 1.75rem;
    --space-card: 0.875rem;
    --space-gap: 0.625rem;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
    accent-color: var(--color-accent);
}

body {
    background: linear-gradient(145deg, #0f172a 0%, #1e293b 100%);
    color: var(--color-text);
    line-height: var(--body-line-height);
    caret-color: var(--color-accent);
}

h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
}

section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
}

.card, [class*="card"] {
    background: var(--color-card);
    color: var(--color-text-inverse);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 0 12px rgba(var(--rgb-accent), 0.25);
}

a:not([class]) {
    color: var(--color-accent);
    transition: var(--transition);
    text-shadow: 0 0 8px rgba(var(--rgb-accent), 0.4);
}

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

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

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* hero: minimal */
.hero { padding: 2rem 0; }
.hero-content { max-width: 560px; }

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

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* stats: big-number */
.stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.stats-grid .stat-value { font-size: 3rem; color: var(--color-accent); text-shadow: 0 0 20px rgba(var(--rgb-accent), 0.5); }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, #1e293b 0%, #334155 100%); color: #f8fafc; padding: 4rem 2rem; box-shadow: inset 0 0 48px rgba(var(--rgb-accent), 0.15); }

/* Page Layout: full-width */
.page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    animation: card-glow-pulse 1.8s ease-in-out infinite;
}

a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 0 16px rgba(var(--rgb-accent), 0.8);
}

.card {
    border-left: 3px solid var(--color-accent);
}

header, .header, .navbar {
    background: rgba(15,23,42,0.55);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

@keyframes card-glow-pulse {
    0%, 100% { box-shadow: 0 0 24px rgba(var(--rgb-accent), 0.4), 0 8px 16px -4px rgba(15,23,42,0.3); }
    50% { box-shadow: 0 0 32px rgba(var(--rgb-accent), 0.6), 0 8px 16px -4px rgba(15,23,42,0.3); }
}

/* 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: 1.75rem; --space-card: 0.875rem; --space-gap: 0.625rem; }
    .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; }
}