:root {
    --color-primary: #7c3aed;
    --color-primary-dark: #4318a8;
    --color-accent: #06b6d4;
    --color-surface: #f5f3ff;
    --color-text: #1b1733;
    --rgb-primary: 124,58,237;
    --rgb-accent: 6,182,212;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 26px;
    --shadow-sm: 0 2px 4px rgba(67,24,168,.10), 0 1px 2px rgba(6,182,212,.08);
    --shadow-md: 0 8px 20px -6px rgba(67,24,168,.22), 0 3px 8px rgba(6,182,212,.12);
    --shadow-lg: 0 22px 44px -14px rgba(67,24,168,.30), 0 8px 18px rgba(6,182,212,.18);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background-color: #f8fafc; background-image: linear-gradient(165deg, #f8fafc 0%, #eef2ff 42%, #ecfeff 78%, #f5f3ff 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: var(--color-primary-dark); text-shadow: 0 1px 0 rgba(255,255,255,.7); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); background-image: radial-gradient(1200px 420px at 50% -10%, rgba(124,58,237,.07), rgba(6,182,212,0) 70%); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background-color: #ffffff; background-image: linear-gradient(180deg, #ffffff 0%, #fbfaff 55%, #f0fbff 100%); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); color: #ffffff; background-image: linear-gradient(135deg, #7c3aed 0%, #6d28d9 45%, #06b6d4 100%); box-shadow: 0 6px 18px -6px rgba(124,58,237,.55), 0 2px 6px rgba(6,182,212,.28); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* ========== 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); }
                .news-grid > *:first-child { grid-row: span 2; }

/* 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; background-image: linear-gradient(135deg, rgba(124,58,237,.16) 0%, rgba(6,182,212,.12) 50%, rgba(67,24,168,.10) 100%); }
                .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: 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; color: var(--color-primary-dark); text-shadow: 0 4px 18px rgba(124,58,237,.28), 0 1px 0 rgba(6,182,212,.35); }

/* cta: card-style */
.cta-inner { background: var(--color-surface); background-image: linear-gradient(135deg, #ede9fe 0%, #e0e7ff 38%, #e0f2fe 70%, #cffafe 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 20px 45px -18px rgba(67,24,168,.30), 0 6px 16px rgba(6,182,212,.16); }

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 2px 10px rgba(6,182,212,.40); }
.card { border: 1px solid transparent; background-origin: border-box; background-clip: padding-box, border-box; background-image: linear-gradient(180deg, #ffffff 0%, #fbfaff 100%), linear-gradient(135deg, rgba(124,58,237,.35) 0%, rgba(6,182,212,.30) 50%, rgba(67,24,168,.28) 100%); }
header, .header, .navbar { background: transparent; background-image: linear-gradient(90deg, rgba(124,58,237,.12) 0%, rgba(6,182,212,.10) 50%, rgba(255,255,255,0) 100%); }

/* 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; }
}