:root {
    --color-primary: #6d28d9;
    --color-primary-dark: #3b0764;
    --color-accent: #14b8a6;
    --color-surface: #ede9fe;
    --color-text: #1e1b4b;
    --rgb-primary: 109,40,217;
    --rgb-accent: 20,184,166;
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-xl: 40px;
    --shadow-sm: 0 2px 10px rgba(109,40,217,.08), 0 1px 3px rgba(30,27,75,.06);
    --shadow-md: 0 10px 30px rgba(109,40,217,.14), 0 4px 8px rgba(30,27,75,.08);
    --shadow-lg: 0 20px 50px rgba(109,40,217,.20), 0 8px 16px rgba(30,27,75,.10);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(circle at 85% 15%, rgba(20,184,166,.18), transparent 45%),
                radial-gradient(circle at 10% 90%, rgba(109,40,217,.16), transparent 40%),
                linear-gradient(135deg, #f8fafc 0%, #fdf4ff 45%, #ecfeff 100%);
}

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

section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background: radial-gradient(ellipse 70% 50% at 50% 0%, rgba(255,255,255,.55), transparent 75%);
}

.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255,255,255,.9);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(145deg, rgba(255,255,255,.96) 0%, rgba(250,247,255,.88) 40%, rgba(236,254,255,.92) 100%);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: linear-gradient(135deg, #7c3aed 0%, var(--color-primary) 40%, var(--color-accent) 140%);
    color: #fdfcf8;
    box-shadow: 0 6px 20px rgba(109,40,217,.25), 0 2px 6px rgba(30,27,75,.10), inset 0 1px 0 rgba(255,255,255,.28);
    text-shadow: 0 1px 3px rgba(0,0,0,.15);
    border-color: transparent;
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 0 10px rgba(109,40,217,.12);
}

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

/* news: masonry-2 */
/* 两列瀑布流 */
.news-grid { column-count: 2; column-gap: var(--space-gap); }
.news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); }

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

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

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

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

/* faq: with-sidebar */
.faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

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

/* cta: full-bg */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 45%, var(--color-accent) 130%);
    color: #f8fafc;
    padding: 4rem 2rem;
    box-shadow: inset 0 0 60px rgba(30,27,75,.25);
    text-shadow: 0 1px 4px rgba(0,0,0,.15);
}

/* Page Layout: wide */
.page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
header, .header, .navbar {
    background: linear-gradient(180deg, rgba(237,233,254,.7) 0%, rgba(237,233,254,0) 100%);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

/* 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; }
}