:root {
    --color-primary: #7c3aed;
    --color-primary-dark: #4c1d95;
    --color-accent: #22c55e;
    --color-surface: #f6fbff;
    --color-text: #0f172a;
    --rgb-primary: 124,58,237;
    --rgb-accent: 34,197,94;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, .08), 0 10px 20px rgba(124, 58, 237, .10);
    --shadow-md: 0 10px 28px rgba(15, 23, 42, .12), 0 2px 0 rgba(255,255,255,.55) inset, 0 -1px 0 rgba(15, 23, 42, .04) inset;
    --shadow-lg: 0 28px 70px rgba(15, 23, 42, .18), 0 10px 24px rgba(124, 58, 237, .18), 0 0 0 1px rgba(124, 58, 237, .18) inset;
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.55s cubic-bezier(.16,1,.3,1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); }
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(255,255,255,.65),
        0 10px 28px rgba(15, 23, 42, .12),
        0 0 0 1px rgba(124, 58, 237, .14) inset,
        0 0 0 8px rgba(124, 58, 237, .06);
    padding: var(--space-card);
    transition: var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 1px 0 rgba(255,255,255,.6),
        0 12px 26px rgba(124, 58, 237, .16),
        0 0 0 1px rgba(124, 58, 237, .18) inset;
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.35);
}

/* ========== 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:
                        radial-gradient(120% 90% at 15% 5%, rgba(124,58,237,.18) 0%, rgba(124,58,237,.05) 45%, rgba(255,255,255,.0) 70%),
                        linear-gradient(180deg, rgba(255,255,255,.8), rgba(255,255,255,.62));
                    border: 1px solid rgba(124, 58, 237, .18);
                    box-shadow:
                        0 1px 0 rgba(255,255,255,.75),
                        0 16px 34px rgba(15, 23, 42, .10),
                        0 0 0 1px rgba(124, 58, 237, .12) inset,
                        8px 18px 40px rgba(34, 197, 94, .08);
                }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }
.feature-list > * {
    border-radius: calc(var(--radius-md) - 2px);
}

/* hero: minimal */
.hero { padding: 2rem 0; }
.hero-content { max-width: 560px; }
.hero-content, .hero [class*="content"] {
    border-radius: var(--radius-xl);
    background:
        radial-gradient(120% 80% at 10% 10%, rgba(34,197,94,.22) 0%, rgba(34,197,94,.08) 40%, rgba(255,255,255,0) 70%),
        radial-gradient(90% 70% at 90% 0%, rgba(124,58,237,.25) 0%, rgba(124,58,237,.08) 42%, rgba(255,255,255,0) 68%),
        linear-gradient(180deg, rgba(255,255,255,.82), rgba(255,255,255,.60));
    box-shadow:
        0 1px 0 rgba(255,255,255,.7),
        0 30px 80px rgba(124, 58, 237, .14),
        0 0 0 1px rgba(15, 23, 42, .06) inset;
}

/* 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 {
                    background:
                        linear-gradient(135deg, rgba(124,58,237,.12) 0%, rgba(34,197,94,.10) 45%, rgba(255,255,255,.65) 100%);
                    border: 1px solid rgba(34, 197, 94, .18);
                    box-shadow:
                        0 1px 0 rgba(255,255,255,.7),
                        0 14px 32px rgba(15, 23, 42, .10),
                        0 0 0 1px rgba(34, 197, 94, .14) inset,
                        0 0 0 10px rgba(34, 197, 94, .05);
                }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.partner-grid .card {
    border-radius: var(--radius-md);
    background:
        linear-gradient(135deg, rgba(34,197,94,.16) 0%, rgba(124,58,237,.10) 50%, rgba(255,255,255,.62) 100%);
    border: 1px solid rgba(15, 23, 42, .08);
    box-shadow:
        0 1px 0 rgba(255,255,255,.7),
        0 12px 26px rgba(15, 23, 42, .10),
        0 0 0 1px rgba(124, 58, 237, .12) inset;
}

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card {
    border-radius: var(--radius-lg);
    background:
        radial-gradient(120% 90% at 0% 0%, rgba(124,58,237,.20) 0%, rgba(124,58,237,.06) 45%, rgba(255,255,255,.0) 72%),
        linear-gradient(180deg, rgba(255,255,255,.80), rgba(255,255,255,.60));
    border: 1px solid rgba(124, 58, 237, .16);
}

/* 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; }
                .stats-grid .card, .stats-grid [class*="card"] {
                    border-radius: var(--radius-xl);
                    background:
                        conic-gradient(from 200deg at 50% 50%, rgba(124,58,237,.22), rgba(34,197,94,.18), rgba(124,58,237,.22));
                    border: 1px solid rgba(15, 23, 42, .10);
                    box-shadow:
                        0 1px 0 rgba(255,255,255,.72),
                        0 22px 60px rgba(124, 58, 237, .16),
                        0 0 0 1px rgba(124, 58, 237, .18) inset;
                    position: relative;
                    overflow: hidden;
                }
                .stats-grid .card:before, .stats-grid [class*="card"]:before {
                    content: "";
                    position: absolute;
                    inset: -2px;
                    background:
                        radial-gradient(90% 70% at 18% 20%, rgba(255,255,255,.55) 0%, rgba(255,255,255,0) 55%),
                        radial-gradient(90% 70% at 85% 10%, rgba(34,197,94,.18) 0%, rgba(34,197,94,0) 58%),
                        linear-gradient(180deg, rgba(15,23,42,.06), rgba(15,23,42,0) 60%);
                    pointer-events: none;
                }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }
.cta-inner .card, .cta-inner [class*="card"] {
    border-radius: var(--radius-xl);
    border: 1px solid rgba(124, 58, 237, .18);
    background:
        linear-gradient(135deg, rgba(124,58,237,.22) 0%, rgba(34,197,94,.16) 40%, rgba(255,255,255,.68) 100%);
    box-shadow:
        0 1px 0 rgba(255,255,255,.72),
        0 26px 74px rgba(15, 23, 42, .16),
        0 0 0 1px rgba(34, 197, 94, .14) inset;
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 2px 0 rgba(255,255,255,.75),
        0 22px 60px rgba(15, 23, 42, .18),
        0 16px 40px rgba(124, 58, 237, .22),
        0 0 0 1px rgba(124, 58, 237, .28) inset,
        0 0 0 12px rgba(124, 58, 237, .08);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow:
        0 1px 0 rgba(255,255,255,.35),
        0 10px 30px rgba(34,197,94,.28);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(120% 90% at 10% 10%, rgba(34,197,94,.35) 0%, rgba(34,197,94,.08) 38%, rgba(255,255,255,0) 68%),
        radial-gradient(90% 70% at 90% 15%, rgba(124,58,237,.42) 0%, rgba(124,58,237,.10) 45%, rgba(255,255,255,0) 70%),
        linear-gradient(135deg, rgba(124,58,237,.96) 0%, rgba(76,29,149,.96) 45%, rgba(34,197,94,.70) 100%);
}
header, .header, .navbar {
    box-shadow:
        0 2px 10px rgba(15, 23, 42, .08),
        0 14px 40px rgba(124, 58, 237, .10),
        0 0 0 1px rgba(124, 58, 237, .12) inset;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 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; }
}