:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #38bdf8;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 56,189,248;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;

    --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 6px 18px rgba(15, 23, 42, 0.10), 0 1px 0 rgba(148, 163, 184, 0.22) inset;
    --shadow-lg: 0 10px 30px rgba(2, 6, 23, 0.14), 0 2px 0 rgba(148, 163, 184, 0.20) inset;

    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;

    --transition: 0.38s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.6;
    --page-bg: #0b1220;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 800px at 10% 0%, rgba(59,130,246,0.18) 0%, rgba(59,130,246,0.00) 55%), radial-gradient(900px 600px at 90% 20%, rgba(56,189,248,0.14) 0%, rgba(56,189,248,0.00) 60%), linear-gradient(180deg, #0b1220 0%, #0f172a 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); letter-spacing: -0.015em; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 10px rgba(2, 6, 23, 0.12), 0 14px 34px rgba(2, 6, 23, 0.10), 0 1px 0 rgba(148, 163, 184, 0.22) inset;
    padding: var(--space-card);
    transition: transform 0.42s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.42s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.42s cubic-bezier(0.16, 1, 0.3, 1);
    background: linear-gradient(180deg, rgba(248,250,252,0.98) 0%, rgba(241,245,249,0.98) 100%);
    border: 1px solid rgba(148, 163, 184, 0.22);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 0.35s cubic-bezier(0.2, 0.9, 0.2, 1), background-color 0.35s cubic-bezier(0.2, 0.9, 0.2, 1), color 0.35s cubic-bezier(0.2, 0.9, 0.2, 1);
    outline-color: rgba(59, 130, 246, 0.55);
}
a:not([class]) { color: var(--color-primary); transition: color 0.35s cubic-bezier(0.2, 0.9, 0.2, 1), text-shadow 0.35s cubic-bezier(0.2, 0.9, 0.2, 1); text-shadow: 0 0 0 rgba(0,0,0,0); }
a:not([class]):hover, a:not([class]):focus {
    color: var(--color-primary-dark);
    text-shadow: 0 10px 28px rgba(37, 99, 235, 0.35);
}

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

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

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

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

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

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 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: 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 10px 24px rgba(2, 6, 23, 0.16), 0 24px 60px rgba(37, 99, 235, 0.16), 0 1px 0 rgba(148, 163, 184, 0.28) inset;
    background: linear-gradient(180deg, rgba(248,250,252,1) 0%, rgba(226,232,240,0.98) 100%);
}
header, .header, .navbar {
    box-shadow: 0 10px 30px rgba(2, 6, 23, 0.18), 0 2px 0 rgba(56, 189, 248, 0.16) inset;
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
    background: linear-gradient(180deg, rgba(15,23,42,0.78) 0%, rgba(11,18,32,0.72) 100%);
    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; --radius-sm: 6px; --radius-md: 10px; --radius-lg: 13px; --radius-xl: 16px; }
    .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; }
}