:root {
    --color-primary: #0f766e;
    --color-primary-dark: #115e59;
    --color-accent: #ea580c;
    --color-surface: #fef3e2;
    --color-text: #1c1917;
    --rgb-primary: 15,118,110;
    --rgb-accent: 234,88,12;
    --radius-sm: 3px;
    --radius-md: 6px;
    --radius-lg: 14px;
    --radius-xl: 22px;
    --shadow-sm: 0 1px 3px rgba(15,118,110,.14), 0 1px 2px rgba(234,88,12,.08);
    --shadow-md: 0 6px 18px -4px rgba(15,118,110,.22), 0 12px 28px -8px rgba(234,88,12,.16);
    --shadow-lg: 0 24px 48px -12px rgba(15,118,110,.28), 0 8px 20px -6px rgba(234,88,12,.18);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 600;
    --body-line-height: 1.75;
}

body { color: var(--color-text); line-height: var(--body-line-height); background-image: radial-gradient(circle at 12% 8%, rgba(15,118,110,.06), transparent 42%), radial-gradient(circle at 88% 92%, rgba(234,88,12,.06), transparent 46%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); background-image: linear-gradient(105deg, var(--color-primary) 0%, var(--color-primary-dark) 55%, var(--color-accent) 100%); -webkit-background-clip: text; background-clip: text; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
section:nth-of-type(odd), .section:nth-of-type(odd) { background-image: linear-gradient(160deg, rgba(15,118,110,.05) 0%, rgba(15,118,110,.02) 40%, transparent 100%); }
section:nth-of-type(even), .section:nth-of-type(even) { background-image: linear-gradient(200deg, rgba(234,88,12,.06) 0%, rgba(234,88,12,.02) 45%, transparent 100%); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background-image: linear-gradient(150deg, #ffffff 0%, #fdfaf6 55%, #fef3e2 100%); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background-image: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 60%, var(--color-accent) 130%); box-shadow: 0 4px 14px -3px rgba(15,118,110,.4), 0 2px 6px -2px rgba(234,88,12,.3); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: minimal */
.hero { padding: 2rem 0; background-image: linear-gradient(115deg, rgba(15,118,110,.1) 0%, rgba(15,118,110,.04) 30%, rgba(234,88,12,.05) 70%, rgba(234,88,12,.1) 100%); } .hero-content { max-width: 560px; }

/* 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; background-image: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%); -webkit-background-clip: text; background-clip: text; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; background-image: linear-gradient(120deg, rgba(15,118,110,.12) 0%, rgba(15,118,110,.05) 40%, rgba(234,88,12,.08) 100%); border-radius: var(--radius-xl); }

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

/* 条件性装饰 */
.card { border: 1px solid rgba(var(--rgb-primary), .14); border-image: linear-gradient(145deg, rgba(15,118,110,.3) 0%, rgba(234,88,12,.2) 100%) 1; }
header, .header, .navbar { box-shadow: 0 2px 12px -2px rgba(15,118,110,.16), 0 1px 4px -1px rgba(234,88,12,.1); background-image: linear-gradient(180deg, #ffffff 0%, #fdfaf6 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; }
}