:root {
    --color-primary: #1e293b;
    --color-primary-dark: #0b1220;
    --color-accent: #3b82f6;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 30,41,59;
    --rgb-accent: 59,130,246;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 26px;
    --shadow-sm: 0 2px 6px rgba(2, 6, 23, 0.10), 0 1px 2px rgba(2, 6, 23, 0.06);
    --shadow-md: 0 6px 14px rgba(2, 6, 23, 0.10), 0 1px 3px rgba(2, 6, 23, 0.08), 0 18px 40px rgba(2, 6, 23, 0.08);
    --shadow-lg: 0 10px 24px rgba(2, 6, 23, 0.12), 0 2px 8px rgba(2, 6, 23, 0.10), 0 30px 70px rgba(59, 130, 246, 0.10);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.35s cubic-bezier(.2,.8,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.7;
    --focus-ring: rgba(59, 130, 246, 0.35);
    --border-color: rgba(148, 163, 184, 0.35);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); }
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(148, 163, 184, 0.30),
        0 10px 22px rgba(2, 6, 23, 0.10),
        0 22px 55px rgba(2, 6, 23, 0.07);
    padding: var(--space-card);
    transition: var(--transition);
    background: #ffffff;
    border: 1px solid rgba(148, 163, 184, 0.22);
}
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); }

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

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

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

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(1200px 380px at 15% -10%, rgba(59, 130, 246, 0.18), transparent 60%),
        radial-gradient(900px 260px at 90% 0%, rgba(148, 163, 184, 0.26), transparent 55%),
        linear-gradient(180deg, #f8fafc 0%, #eef6ff 100%);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 2px 0 rgba(148, 163, 184, 0.30),
        0 18px 38px rgba(2, 6, 23, 0.10),
        0 45px 90px rgba(59, 130, 246, 0.10);
    border: 1px solid rgba(59, 130, 246, 0.18);
}

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 420px at 10% 0%, rgba(59, 130, 246, 0.26), transparent 55%),
        radial-gradient(700px 360px at 95% 10%, rgba(148, 163, 184, 0.18), transparent 60%),
        linear-gradient(135deg, #1e293b 0%, #0b1220 100%);
}
.card { border-left: 4px solid #3b82f6; }
header, .header, .navbar { background: transparent; }

/* 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; --radius-sm: 10px; --radius-md: 12px; --radius-lg: 16px; --radius-xl: 22px; --transition: 0.3s ease; }
    .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; }
}