:root {
    --color-primary: #4338ca;
    --color-primary-dark: #312e81;
    --color-accent: #f59e0b;
    --color-surface: #f4f1ea;
    --color-text: #1b1a17;
    --color-ink: #1b1a17;
    --color-card-teal: #0f766e;
    --color-card-plum: #9d174d;
    --color-card-lime: #4d7c0f;
    --color-card-sky: #0369a1;
    --rgb-primary: 67,56,202;
    --rgb-accent: 245,158,11;
    --radius-sm: 0;
    --radius-md: 1px;
    --radius-lg: 2px;
    --radius-xl: 4px;
    --shadow-sm: 2px 2px 0 0 #1b1a17;
    --shadow-md: 4px 4px 0 0 #1b1a17;
    --shadow-lg: 7px 7px 0 0 #4338ca;
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.15s cubic-bezier(0.2, 0, 0, 1);
    --heading-weight: 700;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background-color: var(--color-surface);
    background-image:
        radial-gradient(circle at 10% -10%, rgba(67, 56, 202, 0.10), transparent 55%),
        radial-gradient(circle at 92% 4%, rgba(245, 158, 11, 0.12), transparent 48%),
        linear-gradient(180deg, #fbf9f4 0%, #ece8de 100%);
}
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); }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background-color: #fffdf8;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 3px 3px 0 0 var(--color-ink);
    border-color: var(--color-ink);
    border-style: solid;
    color: #fffdf8;
    background-color: var(--color-primary);
    accent-color: var(--color-accent);
    caret-color: var(--color-primary);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

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

/* 卡片马赛克配色：每类卡片独立强调色 */
.news-grid [class*="card"] { box-shadow: 4px 4px 0 0 var(--color-primary); border-color: var(--color-primary); }
.feature-list [class*="card"] { box-shadow: 4px 4px 0 0 var(--color-card-teal); border-color: var(--color-card-teal); }
.testimonial-list [class*="card"] { box-shadow: 4px 4px 0 0 var(--color-card-plum); border-color: var(--color-card-plum); background-image: linear-gradient(135deg, #fffdf8 0%, #fdf1f6 100%); }
.partner-grid > * { box-shadow: 4px 4px 0 0 var(--color-card-sky); border-radius: var(--radius-md); }
.stats-grid > * { box-shadow: 4px 4px 0 0 var(--color-card-lime); background-image: linear-gradient(200deg, #fdfcf5 0%, #f4f7e9 100%); }
.faq-wrapper [class*="card"]:last-child { box-shadow: 5px 5px 0 0 var(--color-accent); background-color: #fff8ea; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card { border-left: 3px solid var(--color-primary); }

/* 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; --shadow-md: 3px 3px 0 0 #1b1a17; --shadow-lg: 5px 5px 0 0 #4338ca; }
    .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; }
}