:root {
    --color-primary: #3d5afe;
    --color-primary-dark: #1a237e;
    --color-accent: #00e5b0;
    --color-surface: #f0f4ff;
    --color-text: #1c2434;
    --rgb-primary: 61,90,254;
    --rgb-accent: 0,229,176;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 30px;
    --shadow-sm: 0 1px 3px rgba(28,36,52,.06), 0 1px 2px rgba(61,90,254,.05);
    --shadow-md: 0 4px 14px rgba(61,90,254,.10), 0 2px 6px rgba(28,36,52,.06);
    --shadow-lg: 0 18px 40px -8px rgba(61,90,254,.22), 0 8px 18px -6px rgba(0,229,176,.14);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.55s cubic-bezier(0.22, 1.2, 0.36, 1);
    --heading-weight: 600;
    --body-line-height: 1.65;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: linear-gradient(160deg, #f0f4ff 0%, #e8eeff 45%, #eef7ff 100%);
    caret-color: var(--color-primary);
    accent-color: var(--color-primary);
}
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: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(145deg, #ffffff 0%, #f6f9ff 55%, #eef3ff 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: linear-gradient(135deg, #3d5afe 0%, #536dfe 50%, #00e5b0 100%);
    color: #ffffff;
    box-shadow: 0 6px 18px -4px rgba(61,90,254,.45);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-color: rgba(61,90,254,.4);
}

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card { display: grid; grid-template-columns: 280px 1fr; }

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

/* hero: minimal */
.hero {
    padding: 2rem 0;
    background: radial-gradient(circle at 20% 20%, rgba(61,90,254,.10) 0%, rgba(0,229,176,.06) 45%, transparent 72%);
}
.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; }

/* 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: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: split */
.cta-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 2rem;
    background: linear-gradient(120deg, #252e3a 0%, #2f3b4d 50%, #1c2434 100%);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

/* 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(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(0,229,176,.35);
}
a:not([class]):hover { color: var(--color-accent); }
.card {
    border: 1px solid transparent;
    border-image: linear-gradient(135deg, rgba(61,90,254,.18), rgba(0,229,176,.18)) 1;
    border-radius: var(--radius-lg);
}

/* 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; }
}