:root {
    --color-primary: #0f766e;
    --color-primary-dark: #115e59;
    --color-accent: #38bdf8;
    --color-surface: #ecfeff;
    --color-text: #052e2b;
    --rgb-primary: 15,118,110;
    --rgb-accent: 56,189,248;
    --radius-sm: 2px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --shadow-sm: 0 2px 6px rgba(2, 44, 42, 0.08), 0 1px 2px rgba(2, 44, 42, 0.06);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.05), 0 20px 40px -10px rgba(0,0,0,0.12);
    --shadow-lg: 0 10px 18px rgba(0,0,0,0.07), 0 30px 60px -20px rgba(0,0,0,0.18);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.42s ease;
    --heading-weight: 650;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, rgba(236,254,255,0.95) 0%, rgba(255,255,255,0.9) 40%, rgba(236,254,255,0.95) 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(0,0,0,0.02),
        0 4px 12px rgba(0,0,0,0.06),
        0 20px 50px -18px rgba(0,0,0,0.16);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
    background:
        radial-gradient(1000px 240px at 15% 0%, rgba(56,189,248,0.16) 0%, rgba(56,189,248,0) 55%),
        radial-gradient(900px 240px at 85% 10%, rgba(15,118,110,0.16) 0%, rgba(15,118,110,0) 55%),
        var(--color-surface);
    border: 1px solid rgba(var(--rgb-primary), 0.12);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), background var(--transition), box-shadow var(--transition), border-color var(--transition);
    caret-color: var(--color-primary);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), opacity var(--transition);
    text-decoration-color: rgba(var(--rgb-primary), 0.35);
    text-underline-offset: 3px;
}
a:not([class]):hover {
    color: #0b4a45;
    text-shadow: 0 10px 20px rgba(15,118,110,0.18);
}
a:not([class]):focus-visible, .btn:focus-visible, button[class*="btn"]:focus-visible, a[class*="btn"]:focus-visible {
    outline: 2px solid rgba(56,189,248,0.65);
    outline-offset: 3px;
    border-radius: var(--radius-md);
}

/* ========== 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; }

/* 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; }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }

/* 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-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow:
        0 2px 0 rgba(0,0,0,0.02),
        0 10px 18px rgba(0,0,0,0.07),
        0 30px 70px -26px rgba(0,0,0,0.22);
    border-color: rgba(var(--rgb-primary), 0.22);
    background:
        radial-gradient(1000px 260px at 15% 0%, rgba(56,189,248,0.22) 0%, rgba(56,189,248,0) 56%),
        radial-gradient(900px 260px at 85% 10%, rgba(15,118,110,0.22) 0%, rgba(15,118,110,0) 56%),
        var(--color-surface);
}
.card { border: 1px solid rgba(var(--rgb-primary), .12); }
.card:hover .btn, .card:hover button[class*="btn"], .card:hover a[class*="btn"] { box-shadow: 0 14px 30px rgba(15,118,110,0.16); }

/* 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; }
}