:root {
    --color-primary: #0b2a4a;
    --color-primary-dark: #071c33;
    --color-accent: #ff3d7f;
    --color-surface: #f7fafc;
    --color-text: #0a1220;
    --rgb-primary: 11,42,74;
    --rgb-accent: 255,61,127;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 6px;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 160ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: #ffffff; }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: none; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-xl);
    box-shadow: none;
    padding: var(--space-card);
    transition: var(--transition);
    background: #ffffff;
    border: 2px solid rgba(9, 24, 44, .12);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 2px solid rgba(9, 24, 44, .18);
    background: #ffffff;
    color: var(--color-primary);
    box-shadow: none;
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration: none; }
a:not([class]):hover { color: var(--color-accent); }

.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow: none;
    border-color: rgba(9, 24, 44, .28);
}
.card { border-left: 3px solid var(--color-accent); }

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

/* news: masonry-2 */
.news-grid { column-count: 2; column-gap: var(--space-gap); }
.news-grid .card {
    break-inside: avoid;
    margin-bottom: var(--space-gap);
    background: #f8fbff;
    border-color: rgba(11, 42, 74, .22);
}
.news-grid .card:nth-child(3n+1) { border-left-color: #ff3d7f; background: #fff6fb; }
.news-grid .card:nth-child(3n+2) { border-left-color: #34d399; background: #f3fffb; }
.news-grid .card:nth-child(3n+3) { border-left-color: #60a5fa; background: #f1f6ff; }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }
.feature-list > * {
    border-color: rgba(9, 24, 44, .18);
}
.feature-list .card:nth-child(4n+1) { background: #f0f7ff; border-color: rgba(59, 130, 246, .24); border-left-color: #60a5fa; }
.feature-list .card:nth-child(4n+2) { background: #f1fff8; border-color: rgba(16, 185, 129, .22); border-left-color: #34d399; }
.feature-list .card:nth-child(4n+3) { background: #fff6f0; border-color: rgba(245, 158, 11, .25); border-left-color: #f59e0b; }
.feature-list .card:nth-child(4n) { background: #fff0f6; border-color: rgba(236, 72, 153, .22); border-left-color: #ff3d7f; }

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

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.testimonial-list .card:nth-child(3n+1) { background: #f3f6ff; border-color: rgba(99, 102, 241, .22); border-left-color: #6d7dff; }
.testimonial-list .card:nth-child(3n+2) { background: #f0fffb; border-color: rgba(45, 212, 191, .22); border-left-color: #2dd4bf; }
.testimonial-list .card:nth-child(3n) { background: #fff3f8; border-color: rgba(244, 63, 94, .20); border-left-color: #ff3d7f; }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.partner-grid .card {
    background: #ffffff;
    border-color: rgba(9, 24, 44, .16);
}
.partner-grid .card:nth-child(2n+1) { border-left-color: #60a5fa; }
.partner-grid .card:nth-child(2n) { border-left-color: #ff3d7f; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card { background: #f7fafc; border-color: rgba(9, 24, 44, .14); border-left-color: #38bdf8; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card { background: #ffffff; border-color: rgba(9, 24, 44, .14); }
.stats-grid .card:nth-child(4n+1) { border-left-color: #ff3d7f; }
.stats-grid .card:nth-child(4n+2) { border-left-color: #34d399; }
.stats-grid .card:nth-child(4n+3) { border-left-color: #60a5fa; }
.stats-grid .card:nth-child(4n) { border-left-color: #f59e0b; }

/* cta: full-bg */
.cta-section {
    background: var(--color-primary);
    color: #ffffff;
    padding: 4rem 2rem;
    border-top: 3px solid rgba(255, 255, 255, .28);
    border-bottom: 3px solid rgba(255, 255, 255, .16);
}
.cta-section .card, .cta-section [class*="card"] {
    background: rgba(255, 255, 255, .06);
    border-color: rgba(255, 255, 255, .22);
    border-left-color: var(--color-accent);
}
.cta-section .btn, .cta-section button[class*="btn"], .cta-section a[class*="btn"] {
    background: #ffffff;
    color: var(--color-primary-dark);
    border-color: rgba(255, 255, 255, .0);
    border-left: 3px solid var(--color-accent);
}

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

/* 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; }
}