:root {
    --color-primary: #1a4d8f;
    --color-primary-dark: #0f2f5e;
    --color-accent: #ff4d6d;
    --color-surface: #f6f2ff;
    --color-text: #0f172a;
    --rgb-primary: 26,77,143;
    --rgb-accent: 255,77,109;
    --radius-sm: 0px;
    --radius-md: 2px;
    --radius-lg: 3px;
    --radius-xl: 4px;

    --shadow-sm: 4px 4px 0 rgba(15, 23, 42, .85);
    --shadow-md: 4px 4px 0 rgba(15, 23, 42, .9), 7px 7px 0 rgba(26, 77, 143, .14);
    --shadow-lg: 4px 4px 0 rgba(15, 23, 42, .95), 9px 9px 0 rgba(255, 77, 109, .14), 16px 16px 24px rgba(2, 6, 23, .18);

    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;

    --transition: 0.15s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 700;
    --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-lg);
    box-shadow:
        4px 4px 0 rgba(15, 23, 42, .92),
        0px 0px 0 2px rgba(26, 77, 143, .35) inset,
        10px 10px 24px rgba(2, 6, 23, .14);
    padding: var(--space-card);
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background-color var(--transition), color var(--transition);
    border: 3px solid rgba(26, 77, 143, .55);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: box-shadow var(--transition), transform var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition);
    border: 2px solid rgba(15, 23, 42, .35);
    box-shadow: 4px 4px 0 rgba(15, 23, 42, .9);
}

a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), filter var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.55);
}

a:not([class]):hover {
    color: var(--color-accent);
    text-shadow:
        0 0 0 rgba(0,0,0,0),
        -2px 2px 0 rgba(15, 23, 42, .25);
    filter: saturate(1.1) contrast(1.05);
}

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* 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: 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: card-style */
.cta-inner {
    background:
        linear-gradient(135deg, rgba(255,255,255,.95) 0%, rgba(246, 242, 255, .95) 40%, rgba(255, 242, 251, .95) 100%),
        radial-gradient(800px circle at 10% 10%, rgba(26, 77, 143, .12) 0%, rgba(26, 77, 143, 0) 55%),
        radial-gradient(900px circle at 90% 30%, rgba(255, 77, 109, .12) 0%, rgba(255, 77, 109, 0) 60%);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        4px 4px 0 rgba(15, 23, 42, .92),
        0 0 0 3px rgba(255, 77, 109, .25) inset,
        10px 10px 24px rgba(2, 6, 23, .12);
    border: 3px solid rgba(15, 23, 42, .16);
    backdrop-filter: blur(6px);
}

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

/* 条件性装饰 */
a:not([class]):hover { 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; }
}