:root {
    --color-primary: #0e7490;
    --color-primary-dark: #155e75;
    --color-accent: #22d3ee;
    --color-surface: #ecfeff;
    --color-text: #0c1a1f;
    --rgb-primary: 14,116,144;
    --rgb-accent: 34,211,238;
    --radius-sm: 4px;
    --radius-md: 10px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    --shadow-sm: 0 1px 3px rgba(14,116,144,.14), 0 1px 2px rgba(34,211,238,.08);
    --shadow-md: 0 6px 20px rgba(14,116,144,.16), 0 2px 6px rgba(34,211,238,.10);
    --shadow-lg: 0 18px 44px rgba(14,116,144,.20), 0 6px 16px rgba(34,211,238,.12);
    --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: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(160deg, #ecfeff 0%, #f0fdfa 50%, #e0f2fe 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%, #ecfeff 60%, #cffafe 100%); border: 1px solid rgba(14,116,144,.14); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #0e7490 0%, #22d3ee 100%); color: #ffffff; border: 1px solid rgba(34,211,238,.4); box-shadow: 0 4px 14px rgba(14,116,144,.22); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; background: linear-gradient(120deg, #cffafe 0%, #ecfeff 40%, #ffffff 100%); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: minimal */
.hero { padding: 2rem 0; background: linear-gradient(180deg, rgba(14,116,144,.08) 0%, rgba(34,211,238,.04) 60%, transparent 100%); } .hero-content { max-width: 560px; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }
                .testimonial-list > * { background: linear-gradient(135deg, #ffffff 0%, #f0fdfa 100%); border-left: 3px solid #22d3ee; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partner-grid > * { background: linear-gradient(160deg, #ecfeff 0%, #ffffff 100%); border-radius: var(--radius-md); border: 1px solid rgba(14,116,144,.12); }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list > * { background: linear-gradient(135deg, #f0fdfa 0%, #ecfeff 100%); border-radius: var(--radius-md); border-left: 3px solid #0e7490; }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid > * { background: linear-gradient(180deg, #0e7490 0%, #155e75 100%); color: #ecfeff; border-radius: var(--radius-lg); box-shadow: 0 10px 30px rgba(14,116,144,.28); padding: 1.5rem 1rem; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; background: linear-gradient(135deg, #155e75 0%, #0e7490 50%, #22d3ee 100%); border-radius: var(--radius-xl); box-shadow: 0 20px 50px rgba(14,116,144,.30); padding: 2.5rem 2rem; color: #ffffff; }

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
header, .header, .navbar { background: linear-gradient(180deg, rgba(14,116,144,.10) 0%, transparent 100%); backdrop-filter: blur(8px); }

/* 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; }
}