:root {
    --color-primary: #1d4e6b;
    --color-primary-dark: #143b52;
    --color-accent: #f0a431;
    --color-surface: #eef3f7;
    --color-text: #1b2733;
    --color-sidebar: #252e3a;
    --rgb-primary: 29,78,107;
    --rgb-accent: 240,164,49;
    --rgb-sidebar: 37,46,58;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 26px;
    --shadow-sm: 0 1px 2px rgba(var(--rgb-sidebar),.14), 0 3px 8px -2px rgba(var(--rgb-primary),.18);
    --shadow-md: 0 3px 8px -2px rgba(var(--rgb-sidebar),.20), 0 14px 30px -10px rgba(var(--rgb-primary),.30), 0 0 0 1px rgba(var(--rgb-accent),.12);
    --shadow-lg: 0 10px 24px -8px rgba(var(--rgb-sidebar),.28), 0 30px 60px -18px rgba(var(--rgb-primary),.38), 0 0 0 1px rgba(var(--rgb-accent),.18);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background-color: var(--color-surface); caret-color: var(--color-accent); accent-color: var(--color-primary); }
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(158deg, #ffffff 0%, #f4f9fc 46%, #e7f0f7 78%, #dde9f2 100%);
    border-color: rgba(var(--rgb-accent),.20);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: linear-gradient(135deg, #2f7d8c 0%, #1d4e6b 52%, #143b52 100%);
    color: #f3f8fc;
    box-shadow: 0 2px 6px -1px rgba(var(--rgb-primary),.45), 0 12px 26px -12px rgba(var(--rgb-sidebar),.60), inset 0 1px 0 rgba(var(--rgb-accent),.35);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

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

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* 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: 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; color: var(--color-primary-dark); text-shadow: 0 2px 0 rgba(var(--rgb-accent),.28), 0 10px 26px rgba(var(--rgb-primary),.28); }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(circle at 12% 18%, rgba(var(--rgb-accent),.30) 0%, rgba(var(--rgb-accent),0) 56%),
        linear-gradient(135deg, #252e3a 0%, #1d4e6b 30%, #2f7d8c 58%, #143b52 82%, #1a2b38 100%);
    border-color: rgba(var(--rgb-accent),.30);
    box-shadow: 0 14px 34px -18px rgba(var(--rgb-sidebar),.70), 0 34px 70px -30px rgba(var(--rgb-primary),.55);
}
header, .header, .navbar {
    background: linear-gradient(90deg, #252e3a 0%, #1d4e6b 55%, #2f7d8c 100%);
    box-shadow: 0 4px 14px -5px rgba(var(--rgb-sidebar),.55), 0 16px 36px -16px rgba(var(--rgb-primary),.45), inset 0 -2px 0 rgba(var(--rgb-accent),.45);
}

/* 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; }
}