:root {
    --color-primary: #2b1b3a;
    --color-primary-dark: #120814;
    --color-accent: #00d4ff;
    --color-surface: #f5fbff;
    --color-text: #0b0f18;
    --rgb-primary: 43,27,58;
    --rgb-accent: 0,212,255;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 6px;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 160ms cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
    --focus-ring: rgba(var(--rgb-accent), .55);
}

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: transform var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition);
    border: 1px solid rgba(0,0,0,.14);
    background: #ffffff;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):focus, .btn:focus, button[class*="btn"]:focus { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
::selection { background: rgba(var(--rgb-accent), .25); color: var(--color-text); }
:root { caret-color: var(--color-accent); accent-color: var(--color-accent); }

.hero, [class*="hero"], section:first-of-type { background: #170a22; }
header, .header, .navbar { box-shadow: none; background: #0f172a; border-bottom: 2px solid rgba(0,212,255,.35); }

.page-main { max-width: 1200px; margin: 0 auto; }

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 40px; align-items: start; }
                .news-grid > *:first-child { grid-column: 1 / span 2; }

/* features: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: 40px; max-width: 720px; margin: 0 auto; }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 3fr 1fr; gap: 40px; align-items: center; }
.hero-inner > * { border-radius: var(--radius-lg); }
.hero-inner > :first-child { background: #0b1226; border: 2px solid rgba(0,212,255,.35); }
.hero-inner > :last-child { background: #f7f7fb; border: 2px solid rgba(17,24,39,.18); }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: 8px; }
                .testimonial-list > * { break-inside: avoid; margin-bottom: 8px; }
.testimonial-list > * {
    border-radius: var(--radius-md);
    border: 1px solid rgba(0,0,0,.16);
    background: #ffffff;
}

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; align-items: center; }
.partner-grid > * {
    border-radius: var(--radius-sm);
    border: 2px solid rgba(0,0,0,.12);
    background: #eaffff;
    padding: 10px;
}

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.faq-list > * {
    border-radius: var(--radius-md);
    border: 1px solid rgba(0,0,0,.18);
    background: #ffffff;
}

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 40px; align-items: center; }
.stats-grid > * {
    border-radius: var(--radius-sm);
    border: 2px solid rgba(17,24,39,.14);
    background: #f5fbff;
}

/* cta: card-style */
.cta-inner { background: #00d4ff; border-radius: var(--radius-xl); padding: 3rem; text-align: center; border: 3px solid rgba(0,0,0,.2); }
.cta-inner, .cta-inner * { color: #061019 !important; }
.cta-inner { position: relative; overflow: hidden; }
.cta-inner::after {
    content: "";
    position: absolute;
    inset: -40% -10% auto auto;
    width: 260px;
    height: 260px;
    background: rgba(255,255,255,.35);
    border-radius: 999px;
    pointer-events: none;
    opacity: .55;
}

/* 条件性装饰 */
.card { border: 1px solid rgba(0,0,0,.14); }
section:first-of-type { border-top: 3px solid rgba(0,212,255,.55); }

@media (max-width: 1024px) {
    .news-grid { grid-template-columns: 2fr 1fr !important; gap: 24px; }
    .feature-list { grid-template-columns: repeat(2, 1fr) !important; gap: 24px; }
    .partner-grid { grid-template-columns: repeat(3, 1fr) !important; gap: 8px !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .hero-inner { grid-template-columns: 1fr !important; gap: 24px !important; }
}

@media (max-width: 640px) {
    :root { --space-section: 2rem; --space-card: 1rem; --space-gap: 0.75rem; --transition: 140ms cubic-bezier(0.2, 0.9, 0.2, 1); }
    .news-grid { grid-template-columns: 1fr !important; gap: 8px !important; }
    .feature-list { grid-template-columns: 1fr !important; gap: 16px !important; }
    .faq-list { grid-template-columns: 1fr !important; gap: 16px !important; }
    .testimonial-list { column-count: 1 !important; column-gap: 8px !important; }
    .partner-grid { grid-template-columns: repeat(2, 1fr) !important; gap: 8px !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; gap: 16px !important; }
    .cta-inner { grid-template-columns: 1fr !important; padding: 2rem; border-width: 2px; }
}