:root {
    --color-primary: #7c3aed;
    --color-primary-dark: #5b21b6;
    --color-accent: #fbbf24;
    --color-surface: #f8fafc;
    --color-text: #e9e6ff;
    --rgb-primary: 124,58,237;
    --rgb-accent: 251,191,36;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 6px 18px rgba(0,0,0,.28);
    --shadow-md: 0 14px 40px rgba(10, 8, 25, .35), 0 2px 0 rgba(255,255,255,.06) inset;
    --shadow-lg: 0 26px 70px rgba(0,0,0,.42), 0 10px 24px rgba(124,58,237,.18), 0 1px 0 rgba(255,255,255,.08) inset;

    --space-section: 4.25rem;
    --space-card: 1.5rem;
    --space-gap: 1.35rem;

    --transition: 280ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.7;

    --ring-color: rgba(251,191,36,.55);
    --panel-glass: rgba(255,255,255,.06);
    --panel-border: rgba(251,191,36,.22);
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background:
        radial-gradient(1200px 800px at 50% -10%, rgba(124,58,237,.35) 0%, rgba(124,58,237,0) 60%),
        radial-gradient(900px 700px at 10% 20%, rgba(251,191,36,.16) 0%, rgba(251,191,36,0) 55%),
        linear-gradient(180deg, #0b0a14 0%, #0f0f1a 55%, #0a0912 100%);
    caret-color: var(--color-accent);
    accent-color: var(--color-accent);
}

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);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition), color var(--transition), filter var(--transition);
    background:
        linear-gradient(180deg, rgba(255,255,255,.085) 0%, rgba(255,255,255,.035) 100%);
    border: 1px solid rgba(var(--rgb-accent), .22);
    box-shadow:
        0 28px 80px rgba(0,0,0,.44),
        0 10px 24px rgba(124,58,237,.20),
        0 2px 0 rgba(255,255,255,.08) inset,
        0 -1px 0 rgba(0,0,0,.22) inset;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), background var(--transition), box-shadow var(--transition), color var(--transition), border-color var(--transition);
    box-shadow:
        0 10px 26px rgba(124,58,237,.25),
        0 2px 0 rgba(255,255,255,.10) inset;
}

a:not([class]) {
    color: #c4b5fd;
    transition: color var(--transition), text-shadow var(--transition), filter var(--transition);
}

a:not([class]):hover {
    color: #fbbf24;
}

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

/* news: featured-top */
/* 首篇横跨全宽 */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.news-grid > *:first-child { grid-column: span 3; }

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

/* hero: split */
/* 左文右图 */
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

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

/* partners: scroll */
/* 自动滚动 */
.partner-grid {
    display: flex;
    gap: 2rem;
    overflow: hidden;
    animation: partnerScroll 24s cubic-bezier(.2,.8,.2,1) infinite;
    filter: saturate(1.05) contrast(1.03);
}
@keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

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

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(900px 360px at 50% 0%, rgba(251,191,36,.35) 0%, rgba(251,191,36,0) 60%),
        radial-gradient(700px 340px at 20% 20%, rgba(124,58,237,.55) 0%, rgba(124,58,237,0) 55%),
        linear-gradient(135deg, #6d28d9 0%, #7c3aed 35%, #5b21b6 100%);
    color: rgba(255,255,255,.96);
    padding: 4rem 2rem;
    box-shadow:
        0 40px 120px rgba(124,58,237,.28),
        0 10px 30px rgba(0,0,0,.35);
    border-top: 1px solid rgba(251,191,36,.22);
    border-bottom: 1px solid rgba(251,191,36,.14);
    position: relative;
}
.cta-section::before{
    content:"";
    position:absolute;
    inset: 0;
    border-radius: inherit;
    background:
        linear-gradient(180deg, rgba(255,255,255,.10) 0%, rgba(255,255,255,0) 55%);
    opacity: .55;
    pointer-events:none;
}

/* 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 0 22px rgba(251,191,36,.35); }
.card { border: 1px solid rgba(var(--rgb-primary), .22); box-shadow: var(--shadow-md); }

header, .header, .navbar {
    box-shadow:
        0 18px 50px rgba(0,0,0,.38),
        0 2px 0 rgba(255,255,255,.06) inset;
    background: linear-gradient(180deg, rgba(18,16,35,.72) 0%, rgba(12,10,24,.62) 100%);
    border-bottom: 1px solid rgba(251,191,36,.14);
}

/* 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: 2.25rem; --space-card: 1.1rem; --space-gap: 0.9rem; }
    .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; }
}