:root {
    --color-primary: #2f3f5a;
    --color-primary-dark: #1d2533;
    --color-accent: #4f46e5;
    --color-surface: #f7fafc;
    --color-text: #0b1220;
    --rgb-primary: 47,63,90;
    --rgb-accent: 79,70,229;
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 26px;
    --radius-xl: 34px;
    --shadow-sm: 0 10px 20px rgba(10, 20, 40, 0.08);
    --shadow-md: 0 22px 46px rgba(10, 20, 40, 0.10), 0 8px 18px rgba(10, 20, 40, 0.06);
    --shadow-lg: 0 30px 70px rgba(5, 10, 25, 0.12), 0 12px 30px rgba(5, 10, 25, 0.08);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 360ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 650;
    --body-line-height: 1.7;
    --color-border: rgba(15, 23, 42, 0.10);
    --color-glow: rgba(79, 70, 229, 0.22);
    --color-card: rgba(255, 255, 255, 0.78);
    --color-sidebar: #252e3a;
    --color-sidebar-2: #1b2430;
    --shadow-outline: 0 0 0 1px rgba(79, 70, 229, 0.18);
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(1200px 700px at 15% 0%, rgba(79, 70, 229, 0.10), transparent 55%),
                radial-gradient(900px 520px at 85% 10%, rgba(14, 165, 233, 0.10), transparent 60%),
                linear-gradient(180deg, #f9fbff, #f3f6fb);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
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(255,255,255,0.90), rgba(255,255,255,0.70));
    box-shadow:
        0 1px 0 rgba(255,255,255,0.65) inset,
        0 -1px 0 rgba(10,20,40,0.04) inset,
        0 18px 44px rgba(12, 20, 45, 0.10),
        0 8px 18px rgba(12, 20, 45, 0.07);
    padding: var(--space-card);
    transition:
        box-shadow var(--transition),
        transform var(--transition),
        background var(--transition),
        border-color var(--transition),
        color var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background var(--transition),
        color var(--transition),
        border-color var(--transition),
        filter var(--transition);
    box-shadow:
        0 10px 24px rgba(79, 70, 229, 0.16),
        0 2px 0 rgba(255,255,255,0.55) inset;
}
a:not([class]) { 
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
    outline-color: rgba(79, 70, 229, 0.35);
    caret-color: var(--color-accent);
}

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* 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; }

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

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

/* 条件性装饰 */
a:not([class]):hover { 
    color: var(--color-accent);
    text-shadow: 0 10px 24px rgba(79, 70, 229, 0.20);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 420px at 20% 20%, rgba(79, 70, 229, 0.22), transparent 58%),
        radial-gradient(700px 360px at 80% 10%, rgba(14, 165, 233, 0.18), transparent 58%),
        linear-gradient(135deg, #252e3a, #1b2430);
    box-shadow: 0 28px 80px rgba(8, 14, 30, 0.18);
}
.card { border-left: 4px solid rgba(47,63,90,0.35); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,0.55) inset,
        0 14px 32px rgba(9, 16, 38, 0.10),
        0 6px 16px rgba(9, 16, 38, 0.06);
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(255,255,255,0.78), rgba(255,255,255,0.60));
    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; --radius-md: 16px; --radius-lg: 22px; }
    .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; }
}