:root {
    --color-primary: #1f2b3a;
    --color-primary-dark: #101827;
    --color-accent: #2dd4bf;
    --color-surface: #f3f7ff;
    --color-text: #0b1623;
    --rgb-primary: 31,43,58;
    --rgb-accent: 45,212,191;

    --radius-sm: 2px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 22px;

    --shadow-sm: 0 1px 0 rgba(16,24,39,.10), 0 10px 30px rgba(16,24,39,.06);
    --shadow-md: 0 10px 30px rgba(16,24,39,.10), 0 2px 10px rgba(16,24,39,.06), 0 1px 0 rgba(255,255,255,.60) inset;
    --shadow-lg: 0 18px 50px rgba(16,24,39,.14), 0 6px 18px rgba(16,24,39,.08), 0 1px 0 rgba(255,255,255,.65) inset;

    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;

    --transition: 420ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 15% 0%, rgba(var(--rgb-accent), .12), transparent 55%), radial-gradient(900px 500px at 85% 10%, rgba(96,165,250,.12), transparent 60%), linear-gradient(180deg, #f7fbff 0%, #eef4ff 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0 1px 0 rgba(255,255,255,.65); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 22px 60px rgba(16,24,39,.14),
        0 8px 24px rgba(16,24,39,.08),
        0 1px 0 rgba(255,255,255,.75) inset;
    padding: var(--space-card);
    transition: var(--transition);
    background:
        radial-gradient(1200px 420px at 0% 0%, rgba(var(--rgb-accent), .10), transparent 45%),
        linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(247,251,255,.78) 100%);
    border: 1px solid rgba(var(--rgb-primary), .10);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 10px 26px rgba(16,24,39,.12),
        0 2px 10px rgba(16,24,39,.06);
}
a:not([class]) {
    color: #1f3a56;
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.55);
}

/* ========== 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: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.testimonial-list > * { border-radius: var(--radius-lg); }

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid { text-shadow: 0 1px 0 rgba(255,255,255,.6); }

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

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover {
    color: rgba(var(--rgb-accent), .98);
    text-shadow: 0 0 0 rgba(0,0,0,0), 0 6px 18px rgba(var(--rgb-accent), .22);
}
.card { border: 1px solid rgba(var(--rgb-primary), .12); }
header, .header, .navbar {
    background: linear-gradient(180deg, rgba(255,255,255,.06) 0%, rgba(255,255,255,.02) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(var(--rgb-primary), .10);
}

/* 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; --transition: 380ms cubic-bezier(.2,.8,.2,1); }
    .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; }
}