:root {
    --color-primary: #ef4444;
    --color-primary-dark: #b91c1c;
    --color-accent: #f59e0b;
    --color-surface: #0b1220;
    --color-text: #e5e7eb;
    --rgb-primary: 239,68,68;
    --rgb-accent: 245,158,11;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 7px;
    --radius-xl: 10px;
    --shadow-sm: 0 0 0 rgba(0,0,0,0), 0 1px 0 rgba(255,255,255,.06), 0 2px 6px rgba(0,0,0,.22);
    --shadow-md: 0 0 0 rgba(0,0,0,0), 0 1px 0 rgba(255,255,255,.06), 0 6px 18px rgba(0,0,0,.32);
    --shadow-lg: 0 0 0 rgba(0,0,0,0), 0 2px 0 rgba(255,255,255,.06), 0 10px 26px rgba(0,0,0,.38);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 260ms cubic-bezier(.2,.9,.2,1), 220ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #0a1220 0%, #0b1020 35%, #070b14 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #f1f5f9; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 0 0 1px rgba(255,255,255,.06) inset,
        0 1px 0 rgba(255,255,255,.05) inset,
        0 10px 30px rgba(0,0,0,.35);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.035) 0%, rgba(255,255,255,.02) 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 0 0 1px rgba(255,255,255,.08) inset,
        0 10px 26px rgba(0,0,0,.28);
}
a:not([class]) { color: var(--color-accent); transition: var(--transition); text-shadow: 0 1px 0 rgba(0,0,0,.25); }

/* ========== 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: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* 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:
        radial-gradient(900px circle at 20% 20%, rgba(245,158,11,.35) 0%, rgba(245,158,11,0) 55%),
        radial-gradient(700px circle at 80% 10%, rgba(239,68,68,.35) 0%, rgba(239,68,68,0) 58%),
        linear-gradient(135deg, #111827 0%, #0f172a 45%, #0b1220 100%);
    color: #f8fafc;
    padding: 4rem 2rem;
    box-shadow:
        0 0 0 1px rgba(255,255,255,.06) inset,
        0 18px 50px rgba(0,0,0,.45);
}

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

/* 条件性装饰 */

/* 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; }
}