:root {
    --color-primary: #1c2e4a;
    --color-primary-dark: #0f1e36;
    --color-accent: #ff4d6d;
    --color-surface: #f7f0ff;
    --color-text: #0b1020;
    --rgb-primary: 28,46,74;
    --rgb-accent: 255,77,109;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 6px;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 160ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); }
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: none; padding: var(--space-card); transition: border-color var(--transition), background-color var(--transition), color var(--transition), transform var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition); }

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

.news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
.news-grid .card { display: grid; grid-template-columns: 280px 1fr; }

.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

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

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

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

.faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

.stats-grid { display: flex; justify-content: center; gap: 3rem; }

.cta-section { background: var(--color-primary); color: #ffffff; padding: 4rem 2rem; }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { background: #f7f0ff; }
.card { border: 2px solid rgba(15,30,54,.18); }

/* Flat-solid asymmetric blocks: distinct section/card surfaces */
.hero { border-top: 4px solid #ff4d6d; border-bottom: 4px solid #1c2e4a; }
section:first-of-type { border-left: 6px solid #1c2e4a; border-right: 6px solid #ff4d6d; }

.news-grid .card { background: #ffffff; border-color: rgba(28,46,74,.25); }
.feature-list .card { background: #e8fbff; border-color: rgba(0,120,255,.25); }
.testimonial-list > * { background: #fff3e6; border: 2px solid rgba(255,140,0,.25); border-radius: var(--radius-lg); padding: var(--space-card); box-shadow: none; transition: background-color var(--transition), border-color var(--transition), transform var(--transition); }
.partner-grid .card { background: #f0fff4; border-color: rgba(34,197,94,.25); }

.faq-wrapper > * { background: transparent; }
.faq-wrapper .card { background: #f6f7ff; border-color: rgba(99,102,241,.25); }

.stats-grid .card { background: #111827; color: #ffffff; border-color: rgba(255,255,255,.14); }
.cta-section { border-top: 3px solid rgba(255,255,255,.2); border-bottom: 3px solid rgba(0,0,0,.12); }

h1, h2, h3, h4 { letter-spacing: -0.01em; text-shadow: none; }
a { outline-color: rgba(var(--rgb-accent), .55); caret-color: var(--color-accent); accent-color: var(--color-accent); }
.btn:focus, button[class*="btn"]:focus, a[class*="btn"]:focus { outline: 2px solid rgba(var(--rgb-accent), .55); outline-offset: 2px; }

/* 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; }
    .testimonial-list { column-gap: 0.9rem !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; }
}