:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e40af;
    --color-accent: #f97316;
    --color-surface: #ecfeff;
    --color-text: #0b1220;
    --rgb-primary: 29,78,216;
    --rgb-accent: 249,115,22;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, .03), 0 10px 22px rgba(var(--rgb-primary), .10);
    --shadow-md: 0 1px 0 rgba(15, 23, 42, .03), 0 18px 46px rgba(var(--rgb-primary), .14);
    --shadow-lg: 0 1px 0 rgba(15, 23, 42, .03), 0 26px 78px rgba(var(--rgb-primary), .18);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 520ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 15% -10%, rgba(var(--rgb-primary), .12), rgba(255,255,255,0) 60%), radial-gradient(900px 520px at 90% 10%, rgba(var(--rgb-accent), .10), rgba(255,255,255,0) 55%), linear-gradient(180deg, #f8fafc 0%, #ffffff 55%, #fbfdff 100%); }
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: 0 1px 0 rgba(15, 23, 42, .04), 0 22px 54px rgba(29,78,216,.16), 0 10px 22px rgba(249,115,22,.10); padding: var(--space-card); transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition); background: linear-gradient(180deg, rgba(236,254,255,.92) 0%, rgba(255,255,255,.96) 100%); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition), filter var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.7), 0 10px 22px rgba(var(--rgb-primary), .18); }

/* ========== 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: 0.9rem; }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }

/* 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: 1.1rem; }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2.6rem; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem; }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3.4rem; }

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

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; 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, .04), 0 32px 96px rgba(29,78,216,.22), 0 14px 34px rgba(249,115,22,.14); border-color: rgba(var(--rgb-primary), .22); background: linear-gradient(180deg, rgba(236,254,255,.98) 0%, rgba(255,255,255,1) 100%); }
.card { border: 2px solid rgba(var(--rgb-primary), .10); }

header, .header, .navbar { background: linear-gradient(180deg, rgba(255,255,255,.55) 0%, rgba(248,250,252,.35) 100%); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-radius: 0; border: 0 solid transparent; box-shadow: 0 10px 30px rgba(var(--rgb-primary), .08); }

/* 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-sm: 12px; --radius-md: 14px; --radius-lg: 18px; --radius-xl: 24px; --transition: 460ms cubic-bezier(.2,.85,.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; }
}