:root {
    --color-primary: #2f6feb;
    --color-primary-dark: #1e3f8a;
    --color-accent: #ffb703;
    --color-surface: #f6f8ff;
    --color-text: #0f1b2d;
    --rgb-primary: 47,111,235;
    --rgb-accent: 255,183,3;
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 5px;
    --radius-xl: 7px;
    --shadow-sm: 0 1px 0 rgba(15,27,45,.06), 0 6px 16px rgba(47,111,235,.10);
    --shadow-md: 0 1px 0 rgba(15,27,45,.06), 0 10px 22px rgba(47,111,235,.12);
    --shadow-lg: 0 1px 0 rgba(15,27,45,.07), 0 14px 34px rgba(47,111,235,.14);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 140ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 600;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f7faff 0%, #f4f7ff 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-xl); box-shadow: 0 1px 0 rgba(15,27,45,.08), 0 10px 24px rgba(15,27,45,.06), inset 0 0 0 1px rgba(var(--rgb-primary), .10); padding: var(--space-card); transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition), text-shadow var(--transition), background var(--transition); text-shadow: 0 0 0 rgba(0,0,0,0); }

a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 18px rgba(var(--rgb-accent), .35); }

/* ========== 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); background: linear-gradient(180deg, rgba(255,255,255,.85) 0%, rgba(246,248,255,.88) 100%); }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.feature-list .card, .feature-list [class*="card"] { box-shadow: 0 1px 0 rgba(15,27,45,.07), 0 10px 22px rgba(47,111,235,.10), inset 0 0 0 1px rgba(47,111,235,.10); }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }
.hero-content * { letter-spacing: .01em; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }
.testimonial-list .card, .testimonial-list [class*="card"] { background: linear-gradient(180deg, rgba(255,255,255,.9) 0%, rgba(246,248,255,.9) 100%); box-shadow: 0 1px 0 rgba(15,27,45,.07), 0 12px 26px rgba(15,27,45,.06), inset 0 0 0 1px rgba(255,183,3,.12); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.partner-grid .card, .partner-grid [class*="card"] { background: rgba(255,255,255,.72); box-shadow: 0 1px 0 rgba(15,27,45,.06), 0 10px 20px rgba(47,111,235,.08); }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card, .faq-list [class*="card"] { box-shadow: 0 1px 0 rgba(15,27,45,.07), 0 10px 22px rgba(15,27,45,.05), inset 0 0 0 1px rgba(47,111,235,.09); }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card, .stats-grid [class*="card"] { background: linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(246,248,255,.88) 100%); box-shadow: 0 1px 0 rgba(15,27,45,.07), 0 10px 26px rgba(47,111,235,.10); }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }
.cta-inner .card, .cta-inner [class*="card"] { box-shadow: 0 1px 0 rgba(15,27,45,.08), 0 14px 34px rgba(255,183,3,.12); }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type {
    background:
      radial-gradient(900px 280px at 10% 10%, rgba(47,111,235,.35) 0%, rgba(47,111,235,0) 60%),
      radial-gradient(780px 260px at 80% 0%, rgba(255,183,3,.22) 0%, rgba(255,183,3,0) 60%),
      linear-gradient(135deg, #2f6feb 0%, #1e3f8a 100%);
    color: #f6f8ff;
}
.card { border: 1px solid rgba(var(--rgb-primary), .14); background: rgba(255,255,255,.8); }
header, .header, .navbar { box-shadow: 0 1px 0 rgba(15,27,45,.08), 0 10px 22px rgba(15,27,45,.06), inset 0 -1px 0 rgba(47,111,235,.10); background: rgba(246,248,255,.78); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid rgba(47,111,235,.10); }

/* 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; }
}