:root {
    --color-primary: #4338ca;
    --color-primary-dark: #1e1b4b;
    --color-accent: #22d3ee;
    --color-surface: #f0f9ff;
    --color-text: #0f172a;
    --rgb-primary: 67,56,202;
    --rgb-accent: 34,211,238;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.08), 0 0 12px rgba(34,211,238,.18);
    --shadow-md: 0 6px 16px rgba(30,27,75,.12), 0 0 22px rgba(34,211,238,.26);
    --shadow-lg: 0 18px 40px rgba(30,27,75,.22), 0 0 34px rgba(34,211,238,.46);
    --space-section: 2.4rem;
    --space-card: 1.1rem;
    --space-gap: 0.85rem;
    --transition: 0.28s cubic-bezier(.4,0,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: 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: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: #ffffff; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 0 0 rgba(34,211,238,0); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* 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: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: full-bg */
.cta-section { background: linear-gradient(115deg, #1e1b4b 0%, #4338ca 52%, #0e7490 100%); color: #ecfeff; padding: 4rem 2rem; border-radius: var(--radius-xl); box-shadow: 0 0 24px rgba(34,211,238,.4), 0 24px 60px rgba(30,27,75,.32); animation: strip-glow 5s ease-in-out infinite; }

/* 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 0 32px rgba(34,211,238,.6), 0 20px 44px rgba(30,27,75,.24); }
.card { border-left: 3px solid var(--color-accent); }
header, .header, .navbar { background: linear-gradient(180deg, rgba(240,249,255,.92), rgba(240,249,255,0)); }

@keyframes strip-glow {
    0%, 100% { box-shadow: 0 0 24px rgba(34,211,238,.4), 0 24px 60px rgba(30,27,75,.32); }
    50% { box-shadow: 0 0 40px rgba(34,211,238,.62), 0 24px 60px rgba(30,27,75,.32); }
}

/* 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: 2.4rem; --space-card: 1.1rem; --space-gap: 0.85rem; }
    .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; }
}