: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: 10px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 10px rgba(15, 23, 42, 0.08), 0 18px 36px rgba(15, 23, 42, 0.10);
    --shadow-lg: 0 6px 16px rgba(15, 23, 42, 0.10), 0 28px 60px rgba(15, 23, 42, 0.14);

    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;

    --transition: 0.35s cubic-bezier(0.16, 1, 0.3, 1);

    --heading-weight: 650;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: 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-xl);
    background:
        linear-gradient(180deg, rgba(255,255,255,0.96), rgba(255,255,255,0.88)) padding-box,
        radial-gradient(1200px 260px at 20% 0%, rgba(37,99,235,0.12), transparent 45%) border-box;
    border: 1px solid rgba(15, 23, 42, 0.08);
    box-shadow:
        0 1px 0 rgba(255,255,255,0.75) inset,
        0 2px 8px rgba(15, 23, 42, 0.06),
        0 10px 26px rgba(15, 23, 42, 0.08);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition), filter var(--transition);
    overflow: hidden;
}

.card:hover, [class*="card"]:hover {
    border-color: rgba(37, 99, 235, 0.22);
    box-shadow:
        0 1px 0 rgba(255,255,255,0.85) inset,
        0 4px 12px rgba(15, 23, 42, 0.07),
        0 22px 48px rgba(15, 23, 42, 0.12);
    filter: saturate(1.03);
}

.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);
}

a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), filter var(--transition);
    text-decoration-color: rgba(37, 99, 235, 0.25);
}

a:not([class]):hover, a:not([class]):focus-visible {
    color: var(--color-accent);
    text-shadow: 0 10px 30px rgba(249,115,22,0.18);
    filter: saturate(1.05);
}

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); background-clip: padding-box; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
                .hero-content { position: relative; z-index: 1; }

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

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

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(1100px 420px at 20% 0%, rgba(249,115,22,0.40), transparent 52%),
        radial-gradient(900px 360px at 90% 20%, rgba(37,99,235,0.48), transparent 55%),
        linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow: 0 -1px 0 rgba(255,255,255,0.22) inset, 0 30px 80px rgba(29,78,216,0.20);
}

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
.card { border-left: 4px solid rgba(37, 99, 235, 0.95); }

/* 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; }
}