:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #075985;
    --color-accent: #22c55e;
    --color-surface: #f7fbff;
    --color-text: #0b1220;
    --rgb-primary: 14,165,233;
    --rgb-accent: 34,197,94;
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm:
        0 1px 0 rgba(0,0,0,.06),
        0 8px 18px rgba(var(--rgb-primary), .16);
    --shadow-md:
        0 2px 0 rgba(0,0,0,.05),
        0 12px 26px rgba(7, 89, 133, .16),
        0 2px 10px rgba(34, 197, 94, .10);
    --shadow-lg:
        0 2px 0 rgba(0,0,0,.04),
        0 16px 44px rgba(7, 89, 133, .18),
        0 10px 18px rgba(var(--rgb-primary), .14),
        0 1px 0 rgba(34,197,94,.10);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.55s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); }
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(255,255,255,.65) inset,
        0 2px 0 rgba(0,0,0,.03),
        0 18px 45px rgba(7, 89, 133, .12),
        0 10px 22px rgba(14, 165, 233, .14),
        0 3px 10px rgba(34, 197, 94, .10);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.95), rgba(255,255,255,.78));
}
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); }
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 400px at 15% 25%, rgba(34,197,94,.35), rgba(34,197,94,0) 60%),
        radial-gradient(700px 320px at 85% 20%, rgba(14,165,233,.45), rgba(14,165,233,0) 62%),
        linear-gradient(135deg, #0ea5e9, #0b2a4a 48%, #075985);
    box-shadow: 0 0 0 rgba(0,0,0,0);
}

header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,.55) inset,
        0 10px 30px rgba(2, 132, 199, .12),
        0 2px 10px rgba(0,0,0,.08);
}

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

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

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

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

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

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; 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; }
}