:root {
    --color-primary: #0d9488;
    --color-primary-dark: #115e59;
    --color-accent: #fcd34d;
    --color-surface: #f0fdfa;
    --color-text: #042f2e;
    --rgb-primary: 13,148,136;
    --rgb-accent: 252,211,77;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --shadow-sm: 0 2px 4px rgba(13,148,136,0.08), 0 1px 2px rgba(13,148,136,0.04);
    --shadow-md: 0 4px 8px rgba(13,148,136,0.12), 0 2px 4px rgba(13,148,136,0.06);
    --shadow-lg: 0 8px 16px rgba(13,148,136,0.15), 0 4px 8px rgba(13,148,136,0.08);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #ffffff 0%, #f0fdfa 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); background: linear-gradient(135deg, var(--color-surface) 0%, #ffffff 100%); }
section:nth-of-type(even), .section:nth-of-type(even) { background: linear-gradient(135deg, #042f2e 0%, #0d9488 100%); color: #f0fdfa; }
.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, #f0fdfa); border: 2px solid transparent; border-image: linear-gradient(135deg, var(--color-primary), var(--color-accent)) 1; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); color: #ffffff; box-shadow: 0 4px 12px rgba(13,148,136,0.3); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 2px rgba(13,148,136,0.1); }

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

/* news: list-view */
.news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
.news-grid .card { display: grid; grid-template-columns: 280px 1fr; }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.feature-list .card { background: linear-gradient(145deg, #ffffff, #f0fdfa); }

/* hero: overlay */
.hero { position: relative; min-height: 70vh; display: flex; align-items: center; background: linear-gradient(135deg, #042f2e 0%, #0d9488 50%, #115e59 100%); color: #f0fdfa; }
.hero-content { position: relative; z-index: 1; text-shadow: 0 2px 4px rgba(0,0,0,0.3); }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.testimonial-list .card { background: linear-gradient(160deg, #ffffff, #fefce8); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: with-sidebar */
.faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }
.faq-wrapper .card { background: linear-gradient(160deg, #ffffff, #f0fdfa); }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card { background: linear-gradient(180deg, #0d9488, #115e59); color: #f0fdfa; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; background: linear-gradient(135deg, #fcd34d, #0d9488); padding: 2rem; border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-image: linear-gradient(135deg, var(--color-accent), var(--color-primary)) 1; }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 1px 3px rgba(252,211,77,0.3); }
.card { border: 1px solid rgba(var(--rgb-primary), .08); }
header, .header, .navbar { box-shadow: 0 4px 12px rgba(13,148,136,0.1); backdrop-filter: blur(2px); background: rgba(255,255,255,0.9); }

/* 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; }
}