:root {
    --color-primary: #0f766e;
    --color-primary-dark: #134e4a;
    --color-accent: #5eead4;
    --color-surface: #f0fdfa;
    --color-text: #042f2e;
    --rgb-primary: 15,118,110;
    --rgb-accent: 94,234,212;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px rgba(4,47,46,.08), 0 2px 6px rgba(15,118,110,.06);
    --shadow-md: 0 4px 10px rgba(4,47,46,.1), 0 8px 24px rgba(15,118,110,.08);
    --shadow-lg: 0 12px 28px rgba(4,47,46,.14), 0 6px 14px rgba(15,118,110,.1);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.45s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: linear-gradient(160deg, #f0fdfa 0%, #ccfbf1 45%, #f0fdfa 100%);
}
h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
    background: linear-gradient(135deg, #134e4a 0%, #0f766e 50%, #14b8a6 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--color-primary-dark);
}
section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background: linear-gradient(180deg, rgba(240,253,250,.6) 0%, rgba(204,251,241,.35) 100%);
}
.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 0%, #f0fdfa 55%, #ccfbf1 100%);
    border: 1px solid transparent;
    border-image: linear-gradient(135deg, #5eead4 0%, #0f766e 50%, #134e4a 100%) 1;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: linear-gradient(135deg, #0f766e 0%, #14b8a6 50%, #5eead4 100%);
    color: #f0fdfa;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(15,118,110,.28), 0 1px 3px rgba(4,47,46,.12);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-color: rgba(94,234,212,.7);
}

/* ========== 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: centered */
.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    background: radial-gradient(ellipse at 50% 0%, rgba(94,234,212,.28) 0%, rgba(240,253,250,0) 70%);
}

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

/* partners: grid-4 */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: calc(var(--space-gap) * 1.5);
    align-items: center;
    background: linear-gradient(90deg, rgba(204,251,241,.3) 0%, rgba(240,253,250,.5) 50%, rgba(204,251,241,.3) 100%);
    border-radius: var(--radius-xl);
}

/* 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: linear-gradient(135deg, #134e4a 0%, #0f766e 40%, #14b8a6 70%, #5eead4 100%);
                    -webkit-background-clip: text;
                    background-clip: text;
                    -webkit-text-fill-color: transparent;
                    color: var(--color-primary);
                    text-shadow: 0 2px 8px rgba(94,234,212,.35);
                }

/* cta: split */
.cta-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 2rem;
    background: linear-gradient(120deg, rgba(15,118,110,.08) 0%, rgba(94,234,212,.16) 50%, rgba(15,118,110,.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:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(94,234,212,.4), 0 18px 40px rgba(15,118,110,.18);
    background: linear-gradient(145deg, #ffffff 0%, #ccfbf1 50%, #5eead4 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; }
}