:root {
    --color-primary: #0b5a7a;
    --color-primary-dark: #083a50;
    --color-accent: #ffb703;
    --color-surface: #f4fbff;
    --color-text: #0f1a24;
    --rgb-primary: 11,90,122;
    --rgb-accent: 255,183,3;
    --radius-sm: 0px;
    --radius-md: 1px;
    --radius-lg: 2px;
    --radius-xl: 3px;
    --shadow-sm: 4px 4px 0 rgba(5, 16, 28, 0.35);
    --shadow-md: 4px 4px 0 rgba(5, 16, 28, 0.35), 6px 10px 16px rgba(5, 16, 28, 0.10);
    --shadow-lg: 4px 4px 0 rgba(5, 16, 28, 0.50), 10px 18px 26px rgba(5, 16, 28, 0.16);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.15s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;
    --focus-ring: rgba(255, 183, 3, 0.55);
    --border-strong: rgba(8, 58, 80, 0.35);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: var(--color-surface); }
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: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: #ffffff; border: 2px solid rgba(8, 58, 80, 0.35); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-lg); transition: var(--transition); border: 2px solid rgba(8, 58, 80, 0.35); background: #0b5a7a; color: #ffffff; }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:not([class]):hover { color: var(--color-accent); text-decoration-color: rgba(255, 183, 3, 0.95); }

/* ========== 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, #ffffff 0%, #f5fbff 100%); border-color: rgba(8, 58, 80, 0.30); box-shadow: 4px 4px 0 rgba(5, 16, 28, 0.35), 10px 14px 24px rgba(5, 16, 28, 0.10); }

/* features: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }
                .feature-list .card { background: radial-gradient(1200px circle at 10% 0%, rgba(11, 90, 122, 0.16), transparent 45%), #ffffff; border-color: rgba(8, 58, 80, 0.35); box-shadow: 4px 4px 0 rgba(5, 16, 28, 0.35), 8px 14px 20px rgba(5, 16, 28, 0.10); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }
                .hero-inner .card { background: linear-gradient(135deg, rgba(255, 183, 3, 0.14) 0%, rgba(11, 90, 122, 0.08) 40%, #ffffff 100%); border-color: rgba(255, 183, 3, 0.35); box-shadow: 4px 4px 0 rgba(5, 16, 28, 0.40), 12px 18px 30px rgba(5, 16, 28, 0.12); }

/* 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 .card { background: linear-gradient(180deg, #ffffff 0%, #f2fbff 100%); border-color: rgba(8, 58, 80, 0.30); box-shadow: 4px 4px 0 rgba(5, 16, 28, 0.34), 10px 16px 22px rgba(5, 16, 28, 0.09); }

/* 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 .card { background: #ffffff; border-color: rgba(8, 58, 80, 0.28); box-shadow: 4px 4px 0 rgba(5, 16, 28, 0.33), 8px 12px 18px rgba(5, 16, 28, 0.08); }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card { background: linear-gradient(135deg, rgba(11, 90, 122, 0.10) 0%, rgba(255, 183, 3, 0.10) 55%, #ffffff 100%); border-color: rgba(8, 58, 80, 0.35); box-shadow: 4px 4px 0 rgba(5, 16, 28, 0.35), 10px 18px 26px rgba(5, 16, 28, 0.10); }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card { background: conic-gradient(from 210deg at 50% 50%, rgba(255, 183, 3, 0.20) 0deg, rgba(11, 90, 122, 0.18) 110deg, rgba(255, 255, 255, 1) 220deg, rgba(11, 90, 122, 0.12) 320deg); border-color: rgba(8, 58, 80, 0.28); box-shadow: 4px 4px 0 rgba(5, 16, 28, 0.36), 10px 14px 22px rgba(5, 16, 28, 0.10); }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, #0b5a7a 0%, #083a50 55%, #0a2a3a 100%); color: #fff; padding: 4rem 2rem; box-shadow: 0 0 0 2px rgba(255,183,3,0.30) inset, 0 18px 40px rgba(5,16,28,0.18); border: 2px solid rgba(255, 183, 3, 0.35); }
.cta-section * { text-shadow: 1px 1px 0 rgba(0,0,0,0.35); }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-6px); box-shadow: 4px 4px 0 rgba(5, 16, 28, 0.58), 14px 26px 40px rgba(5, 16, 28, 0.18); border-color: rgba(255, 183, 3, 0.45); }
a:not([class]):hover { color: var(--color-accent); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #0a2a3a 0%, #083a50 28%, #0b5a7a 60%, #0a2a3a 100%); border-top: 2px solid rgba(255, 183, 3, 0.35); border-bottom: 2px solid rgba(255, 183, 3, 0.25); box-shadow: 0 0 0 2px rgba(8, 58, 80, 0.22) inset; }
.card { border: 2px solid rgba(8, 58, 80, .35); }
header, .header, .navbar { background: transparent; border-bottom: 2px solid rgba(8, 58, 80, 0.20); }

/* 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-xl: 2px; --transition: 0.12s cubic-bezier(0.2, 0.9, 0.2, 1); }
    .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; }
}