:root {
    --color-primary: #0f766e;
    --color-primary-dark: #115e59;
    --color-accent: #2dd4bf;
    --color-surface: #f0fdfa;
    --color-text: #042f2e;
    --rgb-primary: 15,118,110;
    --rgb-accent: 45,212,191;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 2px 6px rgba(15,118,110,.12), 0 0 18px rgba(45,212,191,.15);
    --shadow-md: 0 6px 16px rgba(15,118,110,.18), 0 0 24px rgba(45,212,191,.25);
    --shadow-lg: 0 14px 34px rgba(15,118,110,.22), 0 0 36px rgba(45,212,191,.35);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.25s cubic-bezier(.4,0,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: #ffffff; }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: var(--color-primary-dark); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
section:nth-of-type(odd), .section:nth-of-type(odd) { background: #ffffff; }
section:nth-of-type(even), .section:nth-of-type(even) { background: #f0fdfa; }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: #ffffff; border: 1px solid rgba(45,212,191,.25); }
.card:hover, [class*="card"]:hover { box-shadow: 0 0 32px rgba(45,212,191,.6), 0 10px 24px rgba(15,118,110,.2); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 0 18px rgba(45,212,191,.35); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { box-shadow: 0 0 32px rgba(45,212,191,.6); }
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: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

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

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* 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; color: var(--color-primary); text-shadow: 0 0 24px rgba(45,212,191,.5); }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, #042f2e, #0f766e); color: #f0fdfa; padding: 4rem 2rem; box-shadow: inset 0 0 60px rgba(45,212,191,.2); }

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 12px rgba(45,212,191,.5); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #042f2e, #0f766e); box-shadow: inset 0 0 80px rgba(45,212,191,.2); }
.card { border-left: 3px solid var(--color-accent); }
header, .header, .navbar { background: transparent; }

/* 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; }
}