:root {
    --color-primary: #1e293b;
    --color-primary-dark: #0f172a;
    --color-accent: #3b82f6;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --rgb-primary: 59,130,246;
    --rgb-accent: 14,165,233;
    --radius-sm: 0;
    --radius-md: 2px;
    --radius-lg: 4px;
    --radius-xl: 6px;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.65;
    --color-border: rgba(30, 41, 59, 0.22);
    --color-border-strong: rgba(51, 65, 85, 0.35);
    --color-muted: rgba(15, 23, 42, 0.68);
    --color-bg: #e5e7eb;
    --color-card-bg: #ffffff;
    --color-focus: rgba(59, 130, 246, 0.35);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: var(--color-bg); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: var(--color-primary-dark); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: 3px; box-shadow: none; padding: var(--space-card); transition: var(--transition); background: var(--color-card-bg); border: 1px solid var(--color-border); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); border: 1px solid var(--color-border); background: #ffffff; color: var(--color-primary-dark); }
a:not([class]) { color: var(--color-accent); transition: var(--transition); text-decoration: none; }
a:not([class]):hover { color: var(--color-accent); }

section:first-of-type, .hero, [class*="hero"] { border-radius: 3px; border: 1px solid var(--color-border); }

/* ========== 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: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

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

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; color: var(--color-primary-dark); }

/* cta: full-bg */
.cta-section { background: #334155; color: #ffffff; padding: 4rem 2rem; border-top: 1px solid rgba(255,255,255,0.12); border-bottom: 1px solid rgba(0,0,0,0.08); }

/* 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: #60a5fa; }

.hero, [class*="hero"], section:first-of-type { background: #e2e8f0; color: var(--color-primary-dark); }
.hero, [class*="hero"], section:first-of-type { background: #e2e8f0; }
.hero:focus-within, [class*="hero"]:focus-within, section:first-of-type:focus-within { outline: 2px solid var(--color-focus); outline-offset: 2px; }

/* 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; }
}