:root {
    --color-primary: #1e6f8e;
    --color-primary-dark: #0f3a4a;
    --color-accent: #5eead4;
    --color-surface: #eef7fb;
    --color-text: #0b2833;
    --rgb-primary: 30,111,142;
    --rgb-accent: 94,234,212;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 14px;
    --radius-xl: 22px;
    --shadow-sm: 0 2px 6px rgba(15,58,74,.12), 0 1px 2px rgba(30,111,142,.08);
    --shadow-md: 0 8px 20px rgba(15,58,74,.14), 0 3px 8px rgba(30,111,142,.1), 0 0 0 1px rgba(94,234,212,.12);
    --shadow-lg: 0 18px 40px rgba(15,58,74,.18), 0 8px 16px rgba(30,111,142,.12), 0 0 0 1px rgba(94,234,212,.18);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(160deg, #f5fbfd 0%, #eef7fb 45%, #e6f2f8 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: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: linear-gradient(145deg, #ffffff 0%, #f2fafc 55%, #e8f4f9 100%); border: 1px solid rgba(94,234,212,.25); }
.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: grid-3 */
/* 三列等宽网格 */
                .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; background: radial-gradient(ellipse at 30% 20%, rgba(94,234,212,.18) 0%, rgba(30,111,142,.06) 45%, transparent 75%); } .hero-content { max-width: 560px; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 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 */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; background: linear-gradient(135deg, #0f3a4a 0%, #1a5468 50%, #1e6f8e 100%); border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); }
                .stats-grid .stat-value { font-size: 3rem; }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, #0f3a4a 0%, #1e6f8e 45%, #2a8aa8 100%); color: #fff; padding: 4rem 2rem; box-shadow: inset 0 1px 0 rgba(94,234,212,.2), 0 -8px 30px rgba(15,58,74,.15); }

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

/* 条件性装饰 */
header, .header, .navbar { box-shadow: 0 4px 16px rgba(15,58,74,.12), 0 1px 3px rgba(30,111,142,.1), 0 0 0 1px rgba(94,234,212,.15); background: linear-gradient(180deg, #ffffff 0%, #f4fafc 100%); }

/* 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; }
}