:root {
    --color-primary: #0b2239;
    --color-primary-dark: #071427;
    --color-accent: #3b82f6;
    --color-surface: #f8fbff;
    --color-text: #0b1220;
    --rgb-primary: 11,34,57;
    --rgb-accent: 59,130,246;
    --rgb-accent-2: 125,211,252;
    --rgb-primary-2: 30,41,59;
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(2,6,23,.22), 0 10px 24px rgba(2,6,23,.06);
    --shadow-md: 0 8px 18px rgba(2,6,23,.10), 0 2px 6px rgba(2,6,23,.08), inset 0 1px 0 rgba(255,255,255,.45);
    --shadow-lg: 0 18px 40px rgba(2,6,23,.18), 0 8px 18px rgba(2,6,23,.12), inset 0 1px 0 rgba(255,255,255,.55);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.52s cubic-bezier(.2,.9,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(900px 420px at 15% -10%, rgba(59,130,246,.18), rgba(59,130,246,0) 60%),
                radial-gradient(760px 360px at 95% 10%, rgba(125,211,252,.16), rgba(125,211,252,0) 58%),
                linear-gradient(180deg, #0b1220 0%, #0a1628 100%);
}

h1, h2, h3, h4 { font-weight: var(--heading-weight); }

section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background-image: radial-gradient(900px 220px at 50% 0%, rgba(59,130,246,.10), rgba(59,130,246,0) 70%);
}

.card, [class*="card"] {
    border-radius: var(--radius-lg);
    padding: var(--space-card);
    transition: var(--transition);
    box-shadow:
        0 14px 30px rgba(2,6,23,.14),
        0 4px 12px rgba(2,6,23,.10),
        inset 0 1px 0 rgba(255,255,255,.6),
        inset 0 -1px 0 rgba(2,6,23,.12);
    background:
        linear-gradient(180deg, rgba(248,251,255,.98) 0%, rgba(236,246,255,.92) 100%);
    border: 1px solid rgba(148,163,184,.25);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 1px solid rgba(59,130,246,.35);
}

a:not([class]) {
    color: #2563eb;
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.25);
}

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list {
                    display: flex;
                    gap: var(--space-gap);
                    overflow-x: auto;
                    scroll-snap-type: x mandatory;
                    scrollbar-color: rgba(59,130,246,.55) rgba(15,23,42,.25);
                }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero {
                    position: relative;
                    min-height: 70vh;
                    display: flex;
                    align-items: center;
                    background:
                        radial-gradient(980px 520px at 20% 20%, rgba(59,130,246,.30), rgba(59,130,246,0) 60%),
                        radial-gradient(820px 460px at 90% 10%, rgba(125,211,252,.22), rgba(125,211,252,0) 58%),
                        linear-gradient(135deg, #0b2239 0%, #071427 55%, #0a1628 100%);
                    border-bottom: 1px solid rgba(148,163,184,.12);
                }
                .hero-content { position: relative; z-index: 1; }

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

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

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

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

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(920px 420px at 15% 20%, rgba(255,255,255,.20), rgba(255,255,255,0) 55%),
        linear-gradient(135deg, #2563eb 0%, #1d4ed8 55%, #0b3b8a 100%);
    color: #f8fbff;
    padding: 4rem 2rem;
    border-top: 1px solid rgba(255,255,255,.12);
    border-bottom: 1px solid rgba(255,255,255,.10);
    box-shadow:
        0 -20px 60px rgba(59,130,246,.14),
        0 18px 50px rgba(2,6,23,.22);
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow:
        0 24px 60px rgba(2,6,23,.22),
        0 10px 24px rgba(2,6,23,.14),
        0 0 0 1px rgba(59,130,246,.28),
        inset 0 1px 0 rgba(255,255,255,.72);
    border-color: rgba(59,130,246,.35);
}

.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(1000px 480px at 25% 0%, rgba(59,130,246,.26), rgba(59,130,246,0) 60%),
        radial-gradient(760px 360px at 100% 20%, rgba(125,211,252,.18), rgba(125,211,252,0) 55%),
        linear-gradient(135deg, #0b2239 0%, #071427 58%, #0a1628 100%);
}

.card { border: 1px solid rgba(59,130,246,.12); }

header, .header, .navbar {
    background: transparent;
    border-bottom: 1px solid rgba(148,163,184,.10);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* 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; }
}