:root {
    --color-primary: #1d2a3a;
    --color-primary-dark: #0f1722;
    --color-accent: #22c55e;
    --color-surface: #f3f7ff;
    --color-text: #0b1220;
    --rgb-primary: 29,42,58;
    --rgb-accent: 34,197,94;
    --radius-sm: 0;
    --radius-md: 0px;
    --radius-lg: 2px;
    --radius-xl: 3px;
    --shadow-sm: 4px 4px 0 rgba(34,197,94,.28), 0 0 0 2px rgba(34,197,94,.08);
    --shadow-md: 4px 4px 0 rgba(29,42,58,.65), 0 10px 24px rgba(0,0,0,.10), inset 0 0 0 2px rgba(255,255,255,.35);
    --shadow-lg: 4px 4px 0 rgba(29,42,58,.75), 0 18px 40px rgba(0,0,0,.16), inset 0 0 0 3px rgba(255,255,255,.28);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.15s cubic-bezier(.2,.8,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

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-xl);
    box-shadow:
        4px 4px 0 rgba(var(--rgb-primary), .85),
        0 14px 28px rgba(0,0,0,.14),
        inset 0 0 0 2px rgba(255,255,255,.28);
    padding: var(--space-card);
    transition: var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
}
a:not([class]) {
    color: var(--color-accent);
    transition: var(--transition);
    text-shadow: none;
}

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* 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: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

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

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

/* 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; }

/* cta: full-bg */
.cta-section {
    background:
        linear-gradient(135deg, #0f1722 0%, #1d2a3a 45%, #0b3b24 120%);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow:
        4px 4px 0 rgba(0,0,0,.35),
        0 20px 60px rgba(0,0,0,.18),
        inset 0 0 0 2px rgba(255,255,255,.14);
}

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type {
    background:
        linear-gradient(135deg, rgba(29,42,58,1) 0%, rgba(15,23,34,1) 55%, rgba(10,74,43,1) 120%);
}
header, .header, .navbar {
    box-shadow:
        4px 4px 0 rgba(29,42,58,.65),
        0 10px 26px rgba(0,0,0,.10),
        inset 0 0 0 2px rgba(255,255,255,.24);
}

/* 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; }
}