:root {
    --color-primary: #1f2937;
    --color-primary-dark: #0b1220;
    --color-accent: #7c3aed;
    --color-surface: #f7f8ff;
    --color-text: #0f172a;
    --rgb-primary: 31,41,55;
    --rgb-accent: 124,58,237;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --shadow-sm: 0 10px 24px rgba(17, 24, 39, 0.08);
    --shadow-md: 0 16px 42px rgba(2, 6, 23, 0.14);
    --shadow-lg: 0 26px 70px rgba(2, 6, 23, 0.18);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 24px;
    --transition: 260ms cubic-bezier(0.2, 0.8, 0.2, 1);
    --heading-weight: 650;
    --body-line-height: 1.75;

    --glow-accent: rgba(124, 58, 237, 0.42);
    --glow-accent-strong: rgba(124, 58, 237, 0.62);
    --text-shadow: 0 1px 0 rgba(255, 255, 255, 0.65);
}

body { color: var(--color-text); line-height: var(--body-line-height); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: var(--text-shadow); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.9),
        0 10px 30px rgba(2, 6, 23, 0.10),
        0 18px 60px rgba(2, 6, 23, 0.10),
        0 0 0 1px rgba(124, 58, 237, 0.10),
        0 0 24px rgba(124, 58, 237, 0.18);
    padding: var(--space-card);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        border-color var(--transition),
        background-color var(--transition),
        opacity var(--transition),
        filter var(--transition);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(247, 248, 255, 0.92));
    border: 1px solid rgba(124, 58, 237, 0.10);
}
.card:hover, [class*="card"]:hover {
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.95),
        0 14px 44px rgba(2, 6, 23, 0.14),
        0 26px 78px rgba(2, 6, 23, 0.16),
        0 0 0 1px rgba(124, 58, 237, 0.18),
        0 0 32px var(--glow-accent-strong);
    border-color: rgba(124, 58, 237, 0.26);
    filter: saturate(1.02);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        border-color var(--transition),
        color var(--transition),
        opacity var(--transition),
        filter var(--transition);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 16px rgba(124, 58, 237, 0.45); }

section .muted, .muted, .small, .subtle { color: rgba(15, 23, 42, 0.72); }

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); align-items: baseline; }
                .news-grid > *:first-child { grid-row: span 2; }

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

/* 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; }

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

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; align-items: baseline; }

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(1200px 340px at 20% 0%, rgba(124, 58, 237, 0.16), transparent 60%),
        radial-gradient(900px 260px at 90% 10%, rgba(124, 58, 237, 0.12), transparent 55%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(247, 248, 255, 0.94));
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.9),
        0 18px 56px rgba(2, 6, 23, 0.12),
        0 0 0 1px rgba(124, 58, 237, 0.14),
        0 0 28px rgba(124, 58, 237, 0.22);
}

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

/* 条件性装饰 */
header, .header, .navbar { background: transparent; }
header, .header, .navbar * { backdrop-filter: none; -webkit-backdrop-filter: none; }

/* 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: 24px; }
    .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; }
}