:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #f97316;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 249,115,22;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 0 rgba(2,6,23,.04), 0 10px 26px rgba(2,6,23,.06);
    --shadow-md: 0 1px 0 rgba(2,6,23,.04), 0 14px 40px rgba(2,6,23,.10);
    --shadow-lg: 0 1px 0 rgba(2,6,23,.05), 0 26px 70px rgba(2,6,23,.16);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.52s cubic-bezier(.2,.9,.2,1);
    --heading-weight: 650;
    --body-line-height: 1.65;
    --border-soft: rgba(15,23,42,.10);
    --glass: rgba(248,250,252,.55);
    --ring: rgba(37,99,235,.35);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 20% -10%, rgba(var(--rgb-primary),.10), transparent 55%), radial-gradient(900px 500px at 90% 0%, rgba(var(--rgb-accent),.10), transparent 52%), linear-gradient(180deg, #f9fafb, #f3f6fb); }
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: 0 1px 0 rgba(15,23,42,.04), 0 10px 26px rgba(15,23,42,.08), 0 0 0 1px rgba(37,99,235,.06); padding: var(--space-card); transition: var(--transition); background: linear-gradient(180deg, rgba(255,255,255,.96), rgba(255,255,255,.86)); position: relative; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, rgba(37,99,235,.10), rgba(249,115,22,.10)); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.7); }

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

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

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

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

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

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* 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(-6px); box-shadow: 0 1px 0 rgba(15,23,42,.06), 0 24px 60px rgba(15,23,42,.16), 0 0 0 1px rgba(var(--rgb-primary),.18), 0 0 0 6px rgba(var(--rgb-accent),.08); }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(900px 500px at 10% 0%, rgba(37,99,235,.35), transparent 55%), radial-gradient(900px 500px at 90% 10%, rgba(249,115,22,.35), transparent 52%), linear-gradient(135deg, #1d4ed8, #0ea5e9); color: rgba(255,255,255,.96); }
.card { border-style: solid; border-color: rgba(37,99,235,.14); border-width: 1px; background-clip: padding-box; }
header, .header, .navbar { background: transparent; }

/* 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; --radius-lg: 14px; --radius-xl: 18px; --transition: 0.46s cubic-bezier(.2,.9,.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; }
}