:root {
    --color-primary: #c47b5a;
    --color-primary-dark: #8b3a24;
    --color-accent: #87a878;
    --color-surface: #faf8f3;
    --color-text: #2d2d2d;
    --rgb-primary: 196, 123, 90;
    --rgb-accent: 135, 168, 120;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08), 0 0 1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06), 0 0 0 1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.12), 0 6px 12px rgba(0, 0, 0, 0.08), 0 3px 6px rgba(0, 0, 0, 0.04);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background-color: var(--color-surface);
    background-image: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.8) 0%, transparent 60%), radial-gradient(circle at 80% 70%, rgba(218, 165, 32, 0.05) 0%, transparent 60%);
    transition: var(--transition);
}
h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
    color: var(--color-primary-dark);
}
section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background: linear-gradient(to bottom, var(--color-surface), #fff);
}
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(145deg, #fff 0%, var(--color-surface) 100%);
}
.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: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1), 0 1px 4px rgba(0, 0, 0, 0.08);
    padding: 0.6em 1.4em;
    background-size: 200% auto;
}
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover {
    background-position: right center;
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.1);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration: underline;
    text-decoration-color: transparent;
}
a:not([class]):hover {
    text-decoration-color: var(--color-primary);
}

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

/* news: featured-left */
.news-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--space-gap);
    background: linear-gradient(180deg, rgba(196, 123, 90, 0.03) 0%, transparent 100%);
}
.news-grid > *:first-child {
    grid-row: span 2;
}

/* features: grid-4 */
.feature-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-gap);
    background: radial-gradient(ellipse at top left, rgba(135, 168, 120, 0.08), transparent 70%);
}

/* hero: minimal */
.hero {
    padding: 2rem 0;
    background: linear-gradient(to right, var(--color-surface), #fff, var(--color-surface));
}
.hero-content {
    max-width: 560px;
}

/* testimonials: masonry */
.testimonial-list {
    column-count: 2;
    column-gap: var(--space-gap);
}
.testimonial-list > * {
    break-inside: avoid;
    margin-bottom: var(--space-gap);
}

/* partners: grid-4 */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: calc(var(--space-gap) * 1.5);
    align-items: center;
    background: linear-gradient(135deg, rgba(255,255,255,0.6) 0%, rgba(250,248,243,0.8) 100%);
}

/* faq: two-column */
.faq-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-gap);
}

/* stats: grid-4 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-gap);
    text-align: center;
}

/* cta: centered */
.cta-inner {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    background: linear-gradient(to bottom, #fff, var(--color-surface));
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

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

/* 条件性装饰 */
.card {
    border: 1px solid transparent;
    border-image: linear-gradient(160deg, rgba(var(--rgb-primary), 0.3), rgba(var(--rgb-accent), 0.3)) 1;
    border-image-slice: 1;
}
header, .header, .navbar {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1), 0 1px 4px rgba(0, 0, 0, 0.06), 0 0 0 1px rgba(var(--rgb-primary), 0.1);
    background: linear-gradient(to bottom, #fff, var(--color-surface));
}

/* 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; }
}