:root {
    --color-primary: #2c3e50;
    --color-primary-dark: #1a252f;
    --color-accent: #e67e22;
    --color-surface: #ecf0f1;
    --color-text: #2c3e50;
    --rgb-primary: 44,62,80;
    --rgb-accent: 230,126,34;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 2px 4px rgba(44,62,80,0.12), 0 1px 2px rgba(44,62,80,0.08);
    --shadow-md: 0 6px 12px rgba(44,62,80,0.15), 0 3px 6px rgba(44,62,80,0.1);
    --shadow-lg: 0 12px 24px rgba(44,62,80,0.2), 0 5px 10px rgba(44,62,80,0.12);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 50%, #f5f7fa 100%);
    color: var(--color-text);
    line-height: var(--body-line-height);
}

h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background: linear-gradient(180deg, rgba(255,255,255,0.8) 0%, rgba(236,240,241,0.9) 100%);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.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, #f0f2f5);
    border: 1px solid transparent;
    border-image: linear-gradient(135deg, var(--color-primary), var(--color-accent)) 1;
    border-image-slice: 1;
    position: relative;
    overflow: hidden;
}

.card::before, [class*="card"]::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(44,62,80,0.05), rgba(230,126,34,0.05));
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card:hover::before, [class*="card"]:hover::before {
    opacity: 1;
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    border: 1px solid transparent;
    border-image: linear-gradient(135deg, var(--color-accent), var(--color-primary)) 1;
    border-image-slice: 1;
    box-shadow: 0 4px 6px rgba(44,62,80,0.2);
}

.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover {
    box-shadow: 0 6px 12px rgba(44,62,80,0.3);
    transform: translateY(-2px);
    background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration: none;
    position: relative;
}

a:not([class])::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
    transition: var(--transition);
}

a:not([class]):hover {
    color: var(--color-accent);
}

a:not([class]):hover::after {
    width: 100%;
}

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

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: 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: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 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: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
a:not([class]):hover { color: var(--color-accent); }
.card { 
    border-left: 3px solid transparent;
    border-image: linear-gradient(180deg, var(--color-primary), var(--color-accent)) 1;
    border-image-slice: 1;
    border-left-style: solid;
    border-left-width: 3px;
}

/* 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; }
}