:root {
    --color-primary: #1f5f73;
    --color-primary-dark: #113c49;
    --color-accent: #ff6b6b;
    --color-surface: #f7f7fb;
    --color-text: #13202a;
    --rgb-primary: 31,95,115;
    --rgb-accent: 255,107,107;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(19,32,42,0.05);
    --shadow-md: 0 10px 28px rgba(19,32,42,0.08), 0 2px 8px rgba(19,32,42,0.06);
    --shadow-lg: 0 18px 46px rgba(19,32,42,0.12), 0 6px 18px rgba(19,32,42,0.08);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 520ms cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
    --glow: rgba(255,107,107,0.45);
    --glow-strong: rgba(255,107,107,0.7);
}

body { color: var(--color-text); line-height: var(--body-line-height); background: var(--color-surface); }
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:
        0 1px 0 rgba(17,60,73,0.06),
        0 10px 28px rgba(19,32,42,0.09),
        0 3px 10px rgba(19,32,42,0.06),
        0 0 0 1px rgba(31,95,115,0.06) inset;
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), filter var(--transition), border-color var(--transition), background-color var(--transition);
    background:
        linear-gradient(180deg, rgba(255,255,255,0.95), rgba(255,255,255,0.86));
    position: relative;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition), color var(--transition);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), filter var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

/* ========== 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: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

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

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

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow:
        0 1px 0 rgba(17,60,73,0.08),
        0 18px 46px rgba(19,32,42,0.14),
        0 8px 22px rgba(19,32,42,0.10),
        0 0 0 1px rgba(31,95,115,0.08) inset,
        0 0 24px var(--glow);
    filter: saturate(1.03);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow:
        0 0 18px rgba(255,107,107,0.35),
        0 1px 0 rgba(255,107,107,0.12);
}
.card { border-left: 3px solid var(--color-primary); }
.card:hover { border-left-color: var(--color-accent); }

/* 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; }
}