:root {
    --color-primary: #2f5b73;
    --color-primary-dark: #1f3e4d;
    --color-accent: #5eead4;
    --color-surface: #f4fbff;
    --color-text: #0b2a36;
    --rgb-primary: 47,91,115;
    --rgb-accent: 94,234,212;
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 26px;
    --radius-xl: 34px;
    --shadow-sm: 0 1px 0 rgba(8, 21, 28, .10), 0 10px 20px rgba(8, 21, 28, .06);
    --shadow-md: 0 2px 0 rgba(8, 21, 28, .10), 0 16px 34px rgba(9, 22, 30, .10), 0 6px 14px rgba(9, 22, 30, .06);
    --shadow-lg: 0 3px 0 rgba(8, 21, 28, .10), 0 26px 60px rgba(8, 21, 28, .14), 0 10px 24px rgba(8, 21, 28, .08);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 24px;
    --transition: 0.52s cubic-bezier(.2,.85,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.6;
    --ring: rgba(var(--rgb-accent), .55);
    --glass: rgba(255,255,255,.72);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 700px at 15% -10%, rgba(94,234,212,.14) 0%, rgba(244,251,255,0) 55%), radial-gradient(900px 520px at 85% 0%, rgba(47,91,115,.14) 0%, rgba(244,251,255,0) 52%), linear-gradient(180deg, #f7feff 0%, var(--color-surface) 55%, #f2fbff 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0 1px 0 rgba(255,255,255,.55); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: 0 2px 0 rgba(0,0,0,.05), 0 18px 45px rgba(14, 39, 52, .14), 0 10px 22px rgba(14, 39, 52, .08); padding: var(--space-card); transition: box-shadow var(--transition), transform var(--transition), background var(--transition), border-color var(--transition); background: linear-gradient(180deg, rgba(255,255,255,.9) 0%, rgba(244,251,255,.78) 100%); border: 1px solid rgba(var(--rgb-primary), .10); }
.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), filter var(--transition); box-shadow: 0 2px 0 rgba(0,0,0,.04), 0 14px 28px rgba(12, 32, 42, .10); background: linear-gradient(180deg, rgba(47,91,115,.10) 0%, rgba(47,91,115,.03) 100%); color: var(--color-primary-dark); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition), text-shadow var(--transition), filter var(--transition); text-decoration-thickness: 1px; text-underline-offset: 3px; text-shadow: 0 0 0 rgba(0,0,0,0); }
a:not([class]):hover { color: #1f4d62; text-shadow: 0 10px 18px rgba(47,91,115,.20); }

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); align-items: baseline; }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; align-items: baseline; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
                .hero-content { position: relative; z-index: 1; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); align-items: baseline; }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

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

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; align-items: baseline; }
.stats-grid .stat, .stats-grid [class*="stat"] { border-radius: var(--radius-md); border: 1px solid rgba(var(--rgb-primary), .10); background: linear-gradient(180deg, rgba(255,255,255,.86) 0%, rgba(244,251,255,.66) 100%); box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 16px 34px rgba(14, 39, 52, .10); }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

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

/* 条件性装饰 */
.card { border: 1px solid rgba(var(--rgb-primary), .10); background-image: linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(244,251,255,.76) 100%), radial-gradient(900px 220px at 20% 0%, rgba(94,234,212,.20) 0%, rgba(94,234,212,0) 55%); background-blend-mode: normal, screen; }
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: 24px; }
    .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; }
}