:root {
    --color-primary: #c2410c;
    --color-primary-dark: #9a3412;
    --color-accent: #f59e0b;
    --color-surface: #f1f5f9;
    --color-text: #1e293b;
    --rgb-primary: 194,65,12;
    --rgb-accent: 245,158,11;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 32px;
    --shadow-sm: 0 2px 4px -2px rgba(15,23,42,.08), 0 8px 16px -6px rgba(37,46,58,.12);
    --shadow-md: 0 12px 24px -8px rgba(15,23,42,.12), 0 18px 36px -12px rgba(37,46,58,.2), 0 4px 12px -4px rgba(194,65,12,.08), inset 0 1px 0 rgba(255,255,255,.9);
    --shadow-lg: 0 16px 32px -8px rgba(15,23,42,.16), 0 32px 64px -16px rgba(37,46,58,.24), 0 8px 20px -6px rgba(194,65,12,.12), inset 0 1px 0 rgba(255,255,255,.95);
    --space-section: 3.5rem;
    --space-card: 1.375rem;
    --space-gap: 1.125rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: linear-gradient(160deg, #f8fafc 0%, #eef2f7 48%, #e2e8f0 100%);
}

h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
    color: #0f172a;
}

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), inset 0 1px 0 rgba(255,255,255,.85);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(160deg, rgba(255,255,255,.96) 0%, rgba(248,250,252,.9) 60%, rgba(226,232,240,.78) 100%);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 55%, var(--color-accent) 130%);
    color: #fff;
    box-shadow: 0 8px 18px -8px rgba(154,52,18,.7), inset 0 1px 0 rgba(255,255,255,.25);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 3px rgba(194,65,12,.12);
}

/* ========== 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: overlay */
/* 全屏背景+文字覆盖 */
                .hero {
                    position: relative;
                    min-height: 70vh;
                    display: flex;
                    align-items: center;
                    background: linear-gradient(150deg, rgba(37,46,58,.94) 0%, rgba(30,41,59,.82) 100%), radial-gradient(circle at 20% 20%, rgba(245,158,11,.15), transparent 45%), linear-gradient(110deg, rgba(194,65,12,.06), transparent 60%);
                }
                .hero-content {
                    position: relative;
                    z-index: 1;
                }

/* 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: 1.75rem;
}

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

/* stats: big-number */
/* 大数字居中 */
                .stats-grid {
                    display: flex;
                    flex-wrap: wrap;
                    justify-content: center;
                    gap: 1.75rem;
                }
                .stats-grid .stat-value {
                    font-size: 3rem;
                    color: var(--color-primary);
                    text-shadow: 0 4px 12px rgba(194,65,12,.2);
                }

/* cta: centered */
.cta-inner {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main {
                max-width: 860px;
                margin: 0 auto;
            }

/* 条件性装饰 */
header, .header, .navbar {
    color: #f1f5f9;
    background: linear-gradient(135deg, #252e3a 0%, #1e2632 55%, #18202a 100%);
    box-shadow: 0 12px 24px -10px rgba(15,23,42,.2), 0 20px 40px -16px rgba(37,46,58,.35), inset 0 1px 0 rgba(255,255,255,.08);
}

/* 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: 2.25rem;
        --space-card: 1.125rem;
        --space-gap: 0.875rem;
    }
    .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;
    }
}