:root {
    --color-primary: #1f2937;
    --color-primary-dark: #0b1220;
    --color-accent: #7c3aed;
    --color-surface: #eef2f7;
    --color-text: #0b1220;
    --rgb-primary: 31,41,55;
    --rgb-accent: 124,58,237;

    --radius-sm: 7px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 26px;

    --shadow-sm: 0 1px 0 rgba(10,16,30,.06);
    --shadow-md: 0 10px 28px rgba(2,6,23,.10), 0 2px 8px rgba(2,6,23,.06);
    --shadow-lg: 0 18px 48px rgba(2,6,23,.16), 0 6px 18px rgba(2,6,23,.08);

    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.95rem;

    --transition: 520ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;

    --shadow-accent: 0 0 24px rgba(124,58,237,.40);
    --shadow-accent-hover: 0 0 32px rgba(124,58,237,.60);
    --ring: 0 0 0 3px rgba(124,58,237,.22);
    --card-border: rgba(15,23,42,.10);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, rgba(238,242,247,1) 0%, rgba(243,246,251,1) 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); letter-spacing: -0.01em; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: 14px;
    box-shadow:
        0 1px 0 rgba(255,255,255,.85) inset,
        0 0 0 1px var(--card-border),
        0 12px 34px rgba(2,6,23,.10),
        0 4px 14px rgba(2,6,23,.06);
    padding: var(--space-card);
    transition:
        transform var(--transition),
        box-shadow 520ms cubic-bezier(0.16, 1, 0.3, 1),
        border-color 520ms cubic-bezier(0.16, 1, 0.3, 1),
        filter 520ms cubic-bezier(0.16, 1, 0.3, 1);
    background:
        linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(250,252,255,0.98) 100%);
    position: relative;
    overflow: hidden;
}
.card::before, [class*="card"]::before {
    content: "";
    position: absolute;
    inset: -2px;
    background: radial-gradient(600px circle at 20% -10%, rgba(124,58,237,.18), rgba(124,58,237,0) 55%);
    opacity: .9;
    pointer-events: none;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: 14px;
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition);
    box-shadow: 0 8px 20px rgba(2,6,23,.08);
}
a:not([class]) { color: #1f2a44; transition: var(--transition); }
a:not([class]):hover { text-shadow: 0 6px 24px rgba(124,58,237,.28); }

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

/* ========== 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: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 2px; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }
                .feature-list::-webkit-scrollbar { height: 10px; }
                .feature-list::-webkit-scrollbar-thumb { background: rgba(31,41,55,.18); border-radius: 999px; border: 2px solid rgba(238,242,247,.9); }
                .feature-list::-webkit-scrollbar-track { background: rgba(31,41,55,.06); border-radius: 999px; }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
                .hero::after {
                    content: "";
                    position: absolute;
                    inset: 0;
                    background:
                        radial-gradient(900px circle at 15% 10%, rgba(124,58,237,.22), rgba(124,58,237,0) 55%),
                        radial-gradient(700px circle at 80% 30%, rgba(14,165,233,.16), rgba(14,165,233,0) 55%);
                    pointer-events: none;
                }
                .hero-content { position: relative; z-index: 1; }

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

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* 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, rgba(124,58,237,1) 0%, rgba(99,102,241,1) 45%, rgba(14,165,233,1) 100%);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow: 0 18px 60px rgba(124,58,237,.25), 0 10px 30px rgba(2,6,23,.14);
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    border-color: rgba(124,58,237,.35);
    box-shadow:
        0 1px 0 rgba(255,255,255,.9) inset,
        0 0 0 1px rgba(124,58,237,.25),
        0 22px 60px rgba(2,6,23,.18),
        var(--shadow-accent-hover);
    filter: saturate(1.05);
}
a:not([class]):hover { color: #5b21b6; text-shadow: 0 10px 34px rgba(124,58,237,.30); }
.card { border-left: 4px solid rgba(124,58,237,.95); }
.card::after, [class*="card"]::after {
    content: "";
    position: absolute;
    left: -40px;
    top: -40px;
    width: 120px;
    height: 120px;
    background: radial-gradient(circle at 30% 30%, rgba(124,58,237,.28), rgba(124,58,237,0) 60%);
    transform: rotate(18deg);
    opacity: .95;
    pointer-events: none;
    transition: opacity 520ms cubic-bezier(0.16, 1, 0.3, 1), transform 520ms cubic-bezier(0.16, 1, 0.3, 1);
}
.card:hover::after, [class*="card"]:hover::after {
    opacity: 1;
    transform: rotate(18deg) translateY(-6px);
}

/* subtle pulse */
@keyframes cardHaloPulse {
    0%, 100% { box-shadow: 0 1px 0 rgba(255,255,255,.85) inset, 0 0 0 1px rgba(15,23,42,.10), 0 12px 34px rgba(2,6,23,.10), 0 4px 14px rgba(2,6,23,.06); }
    50% { box-shadow: 0 1px 0 rgba(255,255,255,.9) inset, 0 0 0 1px rgba(124,58,237,.20), 0 12px 34px rgba(2,6,23,.10), var(--shadow-accent); }
}
.card { animation: cardHaloPulse 7.2s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) {
    .card { animation: none; }
}

/* 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: 0.95rem; }
    .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; }
}