:root {
    --color-primary: #cbd5e1;
    --color-primary-dark: #0b1220;
    --color-accent: #3b82f6;
    --color-surface: #0f172a;
    --color-text: #e5e7eb;
    --rgb-primary: 200, 210, 225;
    --rgb-accent: 59, 130, 246;
    --radius-sm: 0px;
    --radius-md: 0px;
    --radius-lg: 2px;
    --radius-xl: 3px;
    --shadow-sm: 4px 4px 0 rgba(15, 23, 42, 0.65);
    --shadow-md: 4px 4px 0 rgba(15, 23, 42, 0.75), 8px 10px 18px rgba(2, 6, 23, 0.35);
    --shadow-lg: 4px 4px 0 rgba(59, 130, 246, 0.35), 10px 14px 26px rgba(2, 6, 23, 0.45);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.15s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 650;
    --body-line-height: 1.7;
    --border-strong: 2px;
    --border-color-soft: rgba(148, 163, 184, 0.25);
    --border-color-strong: rgba(59, 130, 246, 0.55);
    --focus-ring: rgba(59, 130, 246, 0.55);
    --card-bg: #ffffff;
    --card-fg: #0b1220;
    --surface-bg: #0f172a;
    --surface-elev: #111c33;
    --text-muted: rgba(226, 232, 240, 0.78);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: var(--surface-bg); }
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:
        4px 4px 0 rgba(15, 23, 42, 0.8),
        0 0 0 var(--border-strong) rgba(59, 130, 246, 0.18),
        10px 14px 28px rgba(2, 6, 23, 0.28);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
    background:
        linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
    border: 2px solid rgba(30, 41, 59, 0.35);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition);
    border: 2px solid rgba(59, 130, 246, 0.35);
    background: linear-gradient(180deg, rgba(59,130,246,0.16) 0%, rgba(59,130,246,0.06) 100%);
    color: #dbeafe;
    box-shadow: 4px 4px 0 rgba(11, 18, 32, 0.55);
}
a:not([class]) { color: #93c5fd; transition: var(--transition); text-shadow: 0 1px 0 rgba(0,0,0,0.25); }

/* ========== 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; background:
        linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border-color: rgba(30, 41, 59, 0.32); box-shadow:
        4px 4px 0 rgba(15, 23, 42, 0.82),
        0 0 0 2px rgba(59, 130, 246, 0.16),
        12px 16px 30px rgba(2, 6, 23, 0.26); }

/* features: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }
                .feature-list .card { border-radius: var(--radius-xl); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }
                .hero-inner .card { box-shadow:
        4px 4px 0 rgba(15, 23, 42, 0.75),
        0 0 0 2px rgba(203, 213, 225, 0.28),
        10px 14px 26px rgba(2, 6, 23, 0.25);
    border-color: rgba(59, 130, 246, 0.28); }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }
                .testimonial-list .card { background:
        radial-gradient(1200px 420px at -20% 0%, rgba(59,130,246,0.16), transparent 55%),
        linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
    border-color: rgba(148, 163, 184, 0.35);
    box-shadow:
        4px 4px 0 rgba(15, 23, 42, 0.80),
        0 0 0 2px rgba(59, 130, 246, 0.14),
        10px 16px 32px rgba(2, 6, 23, 0.30); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partner-grid .card { border-radius: var(--radius-sm); border-color: rgba(59, 130, 246, 0.30); box-shadow:
        4px 4px 0 rgba(15, 23, 42, 0.78),
        0 0 0 2px rgba(30, 41, 59, 0.22),
        8px 10px 20px rgba(2, 6, 23, 0.22); }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }
                .faq-wrapper .card { background:
        linear-gradient(180deg, #ffffff 0%, #eef2ff 100%);
    border-color: rgba(148, 163, 184, 0.30);
    box-shadow:
        4px 4px 0 rgba(15, 23, 42, 0.82),
        0 0 0 2px rgba(59, 130, 246, 0.18),
        12px 18px 34px rgba(2, 6, 23, 0.26); }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card { border-radius: 2px; border-color: rgba(59, 130, 246, 0.28); box-shadow:
        4px 4px 0 rgba(15, 23, 42, 0.85),
        0 0 0 2px rgba(203, 213, 225, 0.26),
        10px 14px 28px rgba(2, 6, 23, 0.24); }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }
.cta-inner .card { border-radius: var(--radius-xl); background:
        conic-gradient(from 210deg at 20% 30%, rgba(59,130,246,0.22), rgba(15,23,42,0) 40%, rgba(59,130,246,0.10) 70%, rgba(255,255,255,0) 100%),
        linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    box-shadow:
        4px 4px 0 rgba(15, 23, 42, 0.82),
        0 0 0 2px rgba(59, 130, 246, 0.20),
        14px 20px 40px rgba(2, 6, 23, 0.28); }

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }
.page-main { filter: saturate(1.05); }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-2px);
    box-shadow:
        4px 4px 0 rgba(59, 130, 246, 0.55),
        0 0 0 2px rgba(59, 130, 246, 0.35),
        14px 20px 40px rgba(2, 6, 23, 0.38);
    border-color: rgba(59, 130, 246, 0.55);
}
.card { border: 2px solid rgba(30, 41, 59, 0.35); }
.card:focus, [class*="card"]:focus { outline: 3px solid var(--focus-ring); 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; --radius-xl: 2px; }
    .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; }
}