:root {
    --color-primary: #0f766e;
    --color-primary-dark: #0b5f57;
    --color-accent: #34d399;
    --color-surface: #fefbf0;
    --color-text: #0f172a;
    --rgb-primary: 15,118,110;
    --rgb-accent: 52,211,153;
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --shadow-sm: 0 1px 2px rgba(2, 44, 34, .10), 0 0 0 1px rgba(2, 44, 34, .06);
    --shadow-md: 0 1px 0 rgba(2, 44, 34, .08), 0 6px 18px rgba(2, 44, 34, .10);
    --shadow-lg: 0 2px 0 rgba(2, 44, 34, .10), 0 10px 28px rgba(2, 44, 34, .12);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 150ms cubic-bezier(.2, .8, .2, 1);
    --heading-weight: 650;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); }
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:
        0 1px 0 rgba(2, 44, 34, .06),
        0 10px 26px rgba(2, 44, 34, .10),
        inset 0 0 0 1px rgba(15,118,110,.10);
    padding: var(--space-card);
    transition: box-shadow var(--transition), transform var(--transition), background-color var(--transition), border-color var(--transition);
    background: rgba(254, 251, 240, .86);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: background-color var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition);
}
a:not([class]):hover { color: var(--color-primary-dark); text-shadow: 0 1px 0 rgba(2, 44, 34, .18); }

/* ========== 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: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: 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; }
                .stats-grid .stat-value { font-size: 3rem; }

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(900px 220px at 15% 10%, rgba(52,211,153,.16), transparent 60%),
        radial-gradient(700px 180px at 85% 0%, rgba(15,118,110,.14), transparent 55%),
        linear-gradient(180deg, rgba(254,251,240,.95), rgba(254,251,240,.80));
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 1px 0 rgba(2, 44, 34, .06),
        0 10px 30px rgba(2, 44, 34, .10),
        inset 0 0 0 1px rgba(15,118,110,.12);
}

/* 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), .12); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(2, 44, 34, .06),
        0 10px 20px rgba(2, 44, 34, .08);
}

/* 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; }
}