:root {
    --color-primary: #5b21b6;
    --color-primary-dark: #3b0764;
    --color-accent: #06b6d4;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 91,33,182;
    --rgb-accent: 6,182,212;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 22px;
    --radius-xl: 26px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, 0.06);
    --shadow-md: 0 10px 24px rgba(2, 6, 23, 0.10), 0 2px 8px rgba(2, 6, 23, 0.06);
    --shadow-lg: 0 18px 44px rgba(2, 6, 23, 0.12), 0 6px 18px rgba(2, 6, 23, 0.08);
    --space-section: 2.25rem;
    --space-card: 1.25rem;
    --space-gap: 1.25rem;
    --transition: 520ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f1f5f9 0%, #eef2f7 45%, #f8fafc 100%); }
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);
    box-shadow:
        0 1px 0 rgba(2, 6, 23, 0.04),
        0 10px 24px rgba(2, 6, 23, 0.08),
        0 2px 10px rgba(2, 6, 23, 0.06);
    padding: var(--space-card);
    transition: var(--transition);
    background: #ffffff;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 1px solid rgba(15, 23, 42, 0.10);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover, a:not([class]):focus { color: var(--color-accent); }

.btn, button[class*="btn"], a[class*="btn"] { caret-color: var(--color-accent); }
.card { caret-color: var(--color-accent); }

/* ========== 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); background: #ffffff; }
                .news-grid .card { border-radius: calc(var(--radius-lg) - 2px); box-shadow:
                    0 1px 0 rgba(2, 6, 23, 0.04),
                    0 12px 30px rgba(2, 6, 23, 0.10),
                    0 3px 12px rgba(2, 6, 23, 0.06);
                }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }
.feature-list .card, .feature-list [class*="card"] { background: #ffffff; box-shadow:
    0 1px 0 rgba(2, 6, 23, 0.04),
    0 10px 26px rgba(2, 6, 23, 0.10),
    0 4px 14px rgba(2, 6, 23, 0.06);
}

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }
                .testimonial-list .card, .testimonial-list [class*="card"] {
                    background: rgba(255,255,255,0.92);
                    backdrop-filter: blur(10px);
                    -webkit-backdrop-filter: blur(10px);
                    box-shadow:
                        0 1px 0 rgba(2, 6, 23, 0.04),
                        0 14px 34px rgba(2, 6, 23, 0.10),
                        0 4px 16px rgba(2, 6, 23, 0.06);
                }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partner-grid .card, .partner-grid [class*="card"] {
    background: transparent;
    border: 1px solid rgba(15, 23, 42, 0.08);
    box-shadow: 0 1px 0 rgba(2, 6, 23, 0.03);
    border-radius: var(--radius-lg);
    padding: 0.75rem;
}

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card, .faq-list [class*="card"] {
    background: #ffffff;
    box-shadow:
        0 1px 0 rgba(2, 6, 23, 0.04),
        0 10px 26px rgba(2, 6, 23, 0.09),
        0 3px 12px rgba(2, 6, 23, 0.06);
}

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card, .stats-grid [class*="card"] {
    background: #ffffff;
    border-radius: calc(var(--radius-lg) - 2px);
    box-shadow:
        0 1px 0 rgba(2, 6, 23, 0.04),
        0 10px 24px rgba(2, 6, 23, 0.08),
        0 2px 10px rgba(2, 6, 23, 0.06);
}
.stats-grid { text-shadow: 0 1px 0 rgba(255,255,255,0.7); }

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, rgba(91,33,182,0.12) 0%, rgba(6,182,212,0.10) 45%, rgba(255,255,255,0.92) 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow:
    0 1px 0 rgba(2, 6, 23, 0.04),
    0 24px 70px rgba(2, 6, 23, 0.12),
    0 10px 24px rgba(91, 33, 182, 0.10);
    border: 1px solid rgba(15, 23, 42, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 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); }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(1200px 600px at 15% 10%, rgba(6,182,212,0.18) 0%, rgba(6,182,212,0.02) 55%, rgba(255,255,255,0) 100%), linear-gradient(135deg, #5b21b6 0%, #3b0764 50%, rgba(6,182,212,0.28) 100%); }
.card { border-left: 3px solid color-mix(in srgb, var(--color-primary) 82%, var(--color-accent) 18%); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(2, 6, 23, 0.04),
        0 14px 40px rgba(2, 6, 23, 0.10);
    background: rgba(248, 250, 252, 0.80);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

/* 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: 1.1rem; --space-gap: 1rem; }
    .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; }
}