:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e3a8a;
    --color-accent: #f97316;
    --color-surface: #eef2ff;
    --color-text: #0f172a;
    --rgb-primary: 29,78,216;
    --rgb-accent: 249,115,22;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

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 4px 10px rgba(2, 6, 23, 0.06),
        0 16px 34px -14px rgba(2, 6, 23, 0.16),
        0 1px 0 rgba(255, 255, 255, 0.5) inset;
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,0.85), rgba(255,255,255,0.72));
    border: 1px solid rgba(15, 23, 42, 0.08);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 6px 18px -10px rgba(2, 6, 23, 0.25),
        0 1px 0 rgba(255, 255, 255, 0.55) inset;
    border: 1px solid rgba(15, 23, 42, 0.10);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
}

a:not([class]):hover { color: var(--color-accent); }

/* ========== 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: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

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

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

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

/* cta: card-style */
.cta-inner {
    background: radial-gradient(1200px 380px at 20% 0%, rgba(99, 102, 241, 0.18), rgba(255,255,255,0) 60%),
                radial-gradient(980px 420px at 95% 20%, rgba(249, 115, 22, 0.16), rgba(255,255,255,0) 62%),
                linear-gradient(180deg, rgba(238, 242, 255, 0.95), rgba(238, 242, 255, 0.78));
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 6px 16px rgba(2, 6, 23, 0.06),
        0 26px 48px -26px rgba(2, 6, 23, 0.20),
        0 1px 0 rgba(255, 255, 255, 0.7) inset;
    border: 1px solid rgba(15, 23, 42, 0.08);
    transition: var(--transition);
}

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }

/* 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; }
}