:root {
    --color-primary: #9a3412;
    --color-primary-dark: #7c2d12;
    --color-accent: #d97706;
    --color-surface: #ffffff;
    --color-text: #1f2937;
    --rgb-primary: 154,52,18;
    --rgb-accent: 217,119,6;
    --radius-sm: 10px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 22px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, .04), 0 10px 25px rgba(15, 23, 42, .06);
    --shadow-md: 0 4px 10px rgba(15, 23, 42, .08), 0 14px 35px rgba(15, 23, 42, .10), inset 0 1px 0 rgba(255,255,255,.65);
    --shadow-lg: 0 6px 18px rgba(2, 6, 23, .10), 0 26px 60px -18px rgba(2, 6, 23, .22), inset 0 1px 0 rgba(255,255,255,.70);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.35s cubic-bezier(0.2, 0.75, 0.25, 1);
    --heading-weight: 650;
    --body-line-height: 1.6;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: #f3f4f6;
    text-rendering: optimizeLegibility;
}

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:
        0 4px 8px rgba(0,0,0,.05),
        0 20px 40px -10px rgba(2, 6, 23, .12),
        0 1px 0 rgba(255,255,255,.75) inset;
    padding: var(--space-card);
    transition: 
        box-shadow var(--transition),
        transform var(--transition),
        border-color var(--transition),
        background var(--transition),
        color var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.98), rgba(255,255,255,.93));
    outline-color: rgba(2, 6, 23, .12);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        box-shadow var(--transition),
        background var(--transition),
        color var(--transition),
        transform var(--transition),
        border-color var(--transition);
    box-shadow:
        0 6px 16px -10px rgba(0,0,0,.18),
        inset 0 1px 0 rgba(255,255,255,.65);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.card { border-left: 3px solid rgba(154, 52, 18, .95); }

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; }

/* 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; } .hero-content { max-width: 560px; }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }

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

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

/* 条件性装饰 */
.card { border-left-color: rgba(217, 119, 6, .95); }

/* 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; }
}