:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #60a5fa;
    --color-surface: #0f172a;
    --color-text: #e5e7eb;
    --rgb-primary: 37,99,235;
    --rgb-accent: 96,165,250;
    --radius-sm: 0px;
    --radius-md: 1px;
    --radius-lg: 2px;
    --radius-xl: 3px;
    --shadow-sm: 4px 4px 0px rgba(37,99,235,.35), 0px 1px 0px rgba(255,255,255,.06) inset, 0px 8px 18px rgba(0,0,0,.12);
    --shadow-md: 4px 4px 0px rgba(37,99,235,.42), 0px 1px 0px rgba(255,255,255,.07) inset, 0px 16px 30px rgba(2,6,23,.30);
    --shadow-lg: 4px 4px 0px rgba(37,99,235,.55), 0px 0px 0px 2px rgba(255,255,255,.04) inset, 0px 24px 50px rgba(2,6,23,.38);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.15s cubic-bezier(.2,.9,.2,1);
    --heading-weight: 650;
    --body-line-height: 1.7;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #0b1224 0%, #0f172a 100%); }
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);
    background: linear-gradient(180deg, rgba(255,255,255,.98) 0%, rgba(255,255,255,.92) 100%);
    color: #0b1224;
    box-shadow:
        4px 4px 0px rgba(37,99,235,.45),
        -2px -2px 0px rgba(255,255,255,.12),
        0px 18px 28px rgba(2,6,23,.35);
    padding: var(--space-card);
    transition: var(--transition);
    border: 2px solid rgba(37,99,235,.20);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 2px solid rgba(37,99,235,.35);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0px 1px 0px rgba(0,0,0,.25); }

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card {
    display: grid;
    grid-template-columns: 280px 1fr;
    border-color: rgba(37,99,235,.22);
    box-shadow:
        4px 4px 0px rgba(37,99,235,.40),
        -2px -2px 0px rgba(255,255,255,.10),
        0px 14px 22px rgba(2,6,23,.30);
}

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; background: radial-gradient(1200px 700px at 20% 10%, rgba(59,130,246,.28) 0%, rgba(59,130,246,.00) 55%), linear-gradient(180deg, #0b1224 0%, #0f172a 70%, #0b1224 100%); }
                .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-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

/* 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: #f1f5f9; text-shadow: 4px 4px 0px rgba(37,99,235,.35); }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow:
        4px 4px 0px rgba(37,99,235,.62),
        -2px -2px 0px rgba(255,255,255,.14),
        0px 26px 56px rgba(2,6,23,.45);
    border-color: rgba(37,99,235,.45);
}
.card { border: 1px solid rgba(var(--rgb-primary), .22); }

/* 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; }
}