:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #3730a3;
    --color-accent: #f59e0b;
    --color-surface: #f4f6fb;
    --color-text: #252e3a;
    --rgb-primary: 79,70,229;
    --rgb-accent: 245,158,11;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 10px rgba(37,46,58,.08), 0 0 16px rgba(var(--rgb-accent), .08);
    --shadow-md: 0 12px 32px rgba(37,46,58,.12), 0 0 28px rgba(var(--rgb-primary), .14), 0 0 12px rgba(var(--rgb-accent), .10);
    --shadow-lg: 0 24px 56px rgba(37,46,58,.18), 0 0 48px rgba(var(--rgb-accent), .28), 0 0 16px rgba(var(--rgb-primary), .16);
    --space-section: 2.25rem;
    --space-card: 0.875rem;
    --space-gap: 0.875rem;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

body {
    background-color: var(--color-surface);
    color: var(--color-text);
    accent-color: var(--color-accent);
    caret-color: var(--color-accent);
    line-height: var(--body-line-height);
}
h1, h2, h3, h4 {
    color: var(--color-primary-dark);
    font-weight: var(--heading-weight);
    text-shadow: 0 1px 2px rgba(37,46,58,.06);
}
section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
}
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md), 0 0 0 1px rgba(var(--rgb-primary), .06);
    padding: var(--space-card);
    transition: var(--transition);
}
.card:hover, [class*="card"]:hover {
    box-shadow: 0 0 40px rgba(var(--rgb-accent), .4), 0 16px 40px rgba(37,46,58,.16), 0 0 0 1px rgba(var(--rgb-primary), .12);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    box-shadow: 0 6px 20px rgba(var(--rgb-primary), .3), 0 0 20px rgba(var(--rgb-accent), .18);
    transition: var(--transition);
}
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover {
    box-shadow: 0 0 36px rgba(var(--rgb-accent), .6), 0 12px 28px rgba(var(--rgb-primary), .4);
}
a:not([class]) {
    color: var(--color-primary);
    text-shadow: 0 0 8px rgba(var(--rgb-primary), .18);
    transition: var(--transition);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 0 16px rgba(var(--rgb-accent), .5);
}

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

/* news: featured-left */
.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-2 */
.feature-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--space-gap) * 1.5);
}

/* hero: minimal */
.hero {
    padding: 2rem 0;
    background: radial-gradient(ellipse at top left, rgba(var(--rgb-primary), .10), transparent 60%);
}
.hero-content { max-width: 560px; }

/* testimonials: masonry */
.testimonial-list {
    column-count: 2;
    column-gap: var(--space-gap);
}
.testimonial-list > * {
    break-inside: avoid;
    margin-bottom: var(--space-gap);
}

/* partners: scroll */
.partner-grid {
    display: flex;
    gap: 2rem;
    overflow: hidden;
    animation: partnerScroll 28s linear infinite;
}
@keyframes partnerScroll {
    0% { transform: translateX(0); filter: drop-shadow(0 0 8px rgba(var(--rgb-accent), .12)); }
    100% { transform: translateX(-50%); filter: drop-shadow(0 0 28px rgba(var(--rgb-primary), .30)); }
}

/* faq: with-sidebar */
.faq-wrapper {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

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

/* cta: split */
.cta-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 2rem;
}

/* Page Layout: wide */
.page-main {
    max-width: 1400px;
    margin: 0 auto;
    background: rgba(255,255,255,.55);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

/* 条件性装饰 */
header, .header, .navbar {
    background: linear-gradient(180deg, rgba(37,46,58,.16), rgba(37,46,58,0));
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
}

/* 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; }
}