:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-accent: #60a5fa;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 59,130,246;
    --rgb-accent: 96,165,250;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 26px;
    --shadow-sm: 0 1px 0 rgba(2, 6, 23, .18), 0 6px 18px rgba(var(--rgb-primary), .14);
    --shadow-md: 0 1px 0 rgba(2, 6, 23, .22), 0 10px 26px rgba(var(--rgb-primary), .14), 0 3px 10px rgba(2, 6, 23, .08);
    --shadow-lg: 0 1px 0 rgba(2, 6, 23, .26), 0 18px 44px rgba(var(--rgb-primary), .18), 0 8px 22px rgba(2, 6, 23, .10);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.48s cubic-bezier(.2, .9, .2, 1);
    --heading-weight: 650;
    --body-line-height: 1.7;
    --grid-border: rgba(148, 163, 184, .22);
    --card-border: rgba(148, 163, 184, .28);
    --card-glow: rgba(59, 130, 246, .22);
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background:
        radial-gradient(1200px 600px at 10% -10%, rgba(59, 130, 246, .22) 0%, rgba(59, 130, 246, 0) 55%),
        radial-gradient(1000px 520px at 92% 6%, rgba(96, 165, 250, .18) 0%, rgba(96, 165, 250, 0) 52%),
        linear-gradient(180deg, #0b1220 0%, #0f172a 55%, #0b1220 100%);
    caret-color: var(--color-primary);
    accent-color: var(--color-primary);
}
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);
    border: 1px solid rgba(148, 163, 184, .28);
    background:
        linear-gradient(180deg, rgba(248, 250, 252, .92) 0%, rgba(248, 250, 252, .82) 100%),
        radial-gradient(800px 220px at 15% 0%, rgba(59, 130, 246, .16) 0%, rgba(59, 130, 246, 0) 55%),
        radial-gradient(700px 240px at 90% 15%, rgba(96, 165, 250, .14) 0%, rgba(96, 165, 250, 0) 58%);
    box-shadow:
        0 1px 0 rgba(2, 6, 23, .32),
        0 12px 30px rgba(15, 23, 42, .18),
        0 10px 28px rgba(var(--rgb-primary), .12);
    padding: var(--space-card);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 1px solid rgba(59, 130, 246, .26);
    background:
        linear-gradient(180deg, rgba(59, 130, 246, .16) 0%, rgba(29, 78, 216, .10) 100%),
        radial-gradient(700px 220px at 20% -10%, rgba(59, 130, 246, .36) 0%, rgba(59, 130, 246, 0) 55%);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, .24) inset,
        0 10px 22px rgba(59, 130, 246, .18);
}
a:not([class]) {
    color: #60a5fa;
    transition: var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

/* ========== 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: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 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; }
                .hero-content { position: relative; z-index: 1; }
.hero {
    background:
        radial-gradient(900px 420px at 18% 18%, rgba(59, 130, 246, .22) 0%, rgba(59, 130, 246, 0) 58%),
        radial-gradient(800px 360px at 82% 8%, rgba(96, 165, 250, .18) 0%, rgba(96, 165, 250, 0) 54%),
        linear-gradient(180deg, rgba(15, 23, 42, .10) 0%, rgba(15, 23, 42, .55) 100%);
}
.hero::before{
    content:"";
    position:absolute;
    inset:0;
    pointer-events:none;
    background:
        linear-gradient(135deg, rgba(59, 130, 246, .16) 0%, rgba(96, 165, 250, 0) 55%),
        linear-gradient(0deg, rgba(2, 6, 23, .55) 0%, rgba(2, 6, 23, .15) 55%, rgba(2, 6, 23, .42) 100%);
    opacity:.95;
    border-radius: var(--radius-xl);
    filter: saturate(1.05);
}

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

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* 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; }
.stats-grid .stat-value{
    color: rgba(248, 250, 252, .98);
    text-shadow:
        0 1px 0 rgba(2, 6, 23, .35),
        0 18px 50px rgba(var(--rgb-primary), .18);
}

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(900px 360px at 18% 20%, rgba(255,255,255,.22) 0%, rgba(255,255,255,0) 52%),
        radial-gradient(760px 300px at 86% 10%, rgba(96, 165, 250, .35) 0%, rgba(96, 165, 250, 0) 58%),
        linear-gradient(135deg, #0b1220 0%, #1d4ed8 40%, #3b82f6 100%);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow:
        0 -1px 0 rgba(255,255,255,.12) inset,
        0 22px 64px rgba(59,130,246,.22);
    border-top: 1px solid rgba(148, 163, 184, .22);
    border-bottom: 1px solid rgba(148, 163, 184, .22);
    border-radius: var(--radius-xl);
}

/* 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 1px 0 rgba(255,255,255,.18) inset,
        0 22px 56px rgba(2, 6, 23, .28),
        0 20px 50px rgba(var(--rgb-primary), .22),
        0 8px 22px rgba(59, 130, 246, .16);
    border-color: rgba(59, 130, 246, .42);
}
header, .header, .navbar { background: transparent; }
header, .header, .navbar{
    border-bottom: 1px solid rgba(148, 163, 184, .18);
    background: linear-gradient(180deg, rgba(2, 6, 23, .18) 0%, rgba(2, 6, 23, 0) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 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; }
}