:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #22c55e;
    --color-surface: #f0f9ff;
    --color-text: #0b1220;
    --rgb-primary: 14,165,233;
    --rgb-accent: 34,197,94;
    --radius-sm: 2px;
    --radius-md: 6px;
    --radius-lg: 12px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(0,0,0,.06), 0 10px 20px rgba(14,165,233,.10);
    --shadow-md: 0 10px 28px rgba(2,132,199,.18), 0 2px 6px rgba(2,132,199,.12), 0 1px 0 rgba(255,255,255,.65) inset;
    --shadow-lg: 0 18px 44px rgba(3,105,161,.22), 0 6px 18px rgba(14,165,233,.14), 0 1px 0 rgba(255,255,255,.7) inset;
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.52s cubic-bezier(.22,.9,.26,1);
    --heading-weight: 700;
    --body-line-height: 1.65;

    --ring: rgba(14,165,233,.35);
    --card-border: rgba(14,165,233,.18);
    --card-bg: rgba(255,255,255,.74);
    --hero-grad-1: #0ea5e9;
    --hero-grad-2: #0369a1;
    --hero-grad-3: rgba(34,197,94,.85);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(900px 420px at 20% 0%, rgba(14,165,233,.10), transparent 55%), radial-gradient(700px 360px at 90% 10%, rgba(34,197,94,.10), transparent 50%), 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:
        0 1px 0 rgba(255,255,255,.7) inset,
        0 12px 30px rgba(3,105,161,.18),
        0 6px 18px rgba(14,165,233,.12),
        0 2px 6px rgba(2,132,199,.10);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(255,255,255,.66));
    border: 1px solid rgba(255,255,255,.55);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 10px 24px rgba(14,165,233,.18), 0 2px 6px rgba(3,105,161,.14);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.35); }

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

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

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

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

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

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 10px 24px rgba(34,197,94,.22); }
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 520px at 15% 20%, rgba(34,197,94,.28), transparent 55%),
        radial-gradient(820px 440px at 85% 10%, rgba(255,255,255,.22), transparent 50%),
        linear-gradient(135deg, var(--hero-grad-1), var(--hero-grad-2) 55%, rgba(34,197,94,.55));
    box-shadow: 0 22px 60px rgba(3,105,161,.25);
}
.card { border: 1px solid var(--card-border); }
header, .header, .navbar {
    background: transparent;
    box-shadow: 0 1px 0 rgba(255,255,255,.35);
}

/* 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; }
}