:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-accent: #93c5fd;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --rgb-primary: 59,130,246;
    --rgb-accent: 147,197,253;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --space-section: 4.5rem;
    --space-card: 1.8rem;
    --space-gap: 1.35rem;
    --transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

body {
    background-color: #1e293b;
    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"] {
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
}

.btn, button[class*="btn"], a[class*="btn"] {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* news: list-view */
.news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
.news-grid .card { display: grid; grid-template-columns: 280px 1fr; }

/* features: horizontal */
.feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
.feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* testimonials: stacked */
.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: big-number */
.stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.stats-grid .stat-value { font-size: 3rem; }

/* cta: full-bg */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary), #1e40af);
    color: #fff;
    padding: 4rem 2rem;
}

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
.card {
    border-left: 3px solid transparent;
    border-image: linear-gradient(to bottom, var(--color-primary), var(--color-accent)) 1;
}

/* 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; }
}