:root {
    --color-primary: #0d9488;
    --color-primary-dark: #0f766e;
    --color-accent: #fbbf24;
    --color-surface: #f0fdfa;
    --color-text: #042f2e;
    --rgb-primary: 13,148,136;
    --rgb-accent: 251,191,36;
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.07), 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.05), 0 0 0 0.5px rgba(13,148,136,0.2);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.07), 0 0 0 1px rgba(13,148,136,0.3);
    --space-section: 5.5rem;
    --space-card: 1.8rem;
    --space-gap: 1.5rem;
    --transition: 0.45s cubic-bezier(0.65, 0, 0.35, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
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: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(135deg, var(--color-surface) 0%, #ffffff 60%, var(--color-surface) 100%);
    border: 1px 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-image: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border: 1px solid transparent;
    border-image: linear-gradient(135deg, var(--color-accent), var(--color-primary)) 1;
    color: #ffffff;
    text-shadow: 0 1px 2px rgba(0,0,0,0.15);
}
a:not([class]) { color: var(--color-accent); transition: var(--transition); }

/* ========== 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: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero {
                    position: relative;
                    min-height: 70vh;
                    display: flex;
                    align-items: center;
                    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
                }
                .hero-content {
                    position: relative;
                    z-index: 1;
                    color: #ffffff;
                    text-shadow: 0 1px 3px rgba(0,0,0,0.2);
                }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; }
                .testimonial-list > * {
                    flex: 0 0 100%;
                    background: linear-gradient(145deg, var(--color-surface), #ffffff);
                    border-radius: var(--radius-lg);
                    box-shadow: var(--shadow-md);
                    padding: var(--space-card);
                }

/* 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;
                    background: linear-gradient(180deg, var(--color-surface), #ffffff);
                    padding: var(--space-card);
                    border-radius: var(--radius-lg);
                }

/* 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;
                    font-weight: 700;
                    color: var(--color-primary-dark);
                    text-shadow: 0 2px 4px rgba(var(--rgb-accent), 0.3);
                }

/* cta: split */
.cta-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 2rem;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
    padding: var(--space-card);
    border-radius: var(--radius-lg);
    color: #ffffff;
}

/* 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); }
.card { border: 1px solid transparent; border-image: linear-gradient(135deg, var(--color-primary), var(--color-accent)) 1; }

/* 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: 2.2rem; --space-card: 1.2rem; --space-gap: 0.9rem; }
    .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; }
}