:root {
    --color-primary: #3b2f66;
    --color-primary-dark: #241a3f;
    --color-accent: #3b82f6;
    --color-surface: #0b1220;
    --color-text: #e6edf7;
    --rgb-primary: 59,130,246;
    --rgb-accent: 59,130,246;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 0px;
    --radius-xl: 2px;
    --shadow-sm: 4px 4px 0 rgba(59, 130, 246, 0.35);
    --shadow-md: 4px 4px 0 rgba(15, 23, 42, 1), 6px 6px 0 rgba(59, 130, 246, 0.22);
    --shadow-lg: 4px 4px 0 rgba(15, 23, 42, 1), 10px 10px 0 rgba(59, 130, 246, 0.28), 0 14px 28px rgba(0,0,0,0.35);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.15s cubic-bezier(0.15, 0.9, 0.2, 1);
    --heading-weight: 650;
    --body-line-height: 1.55;
    --border-strong: rgba(59, 130, 246, 0.75);
    --border-strong-2: rgba(148, 163, 184, 0.35);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 12% 8%, rgba(59, 130, 246, 0.18), transparent 55%), radial-gradient(900px 500px at 90% 20%, rgba(148, 163, 184, 0.12), transparent 60%), linear-gradient(180deg, #0f172a, #0b1220); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); letter-spacing: -0.015em; }
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); border: 2px solid var(--border-strong); background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(255,255,255,0.92)); color: #0b1220; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); }
a:not([class]) { color: #60a5fa; transition: var(--transition); text-decoration-thickness: 2px; text-underline-offset: 3px; }
.card:hover, [class*="card"]:hover { transform: translate(2px, -2px); box-shadow: var(--shadow-lg); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #334155 0%, #1e293b 50%, #0f172a 100%); box-shadow: inset 0 0 0 2px rgba(59,130,246,0.35), inset 0 0 0 5px rgba(255,255,255,0.05); }
.card { border-left: 3px solid var(--color-accent); }

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; }

/* 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; }
                .feature-list { background: linear-gradient(180deg, rgba(148,163,184,0.10), rgba(148,163,184,0.04)); border: 2px solid var(--border-strong-2); border-radius: 2px; padding: 0.25rem; }
                .feature-list::-webkit-scrollbar { height: 10px; }
                .feature-list::-webkit-scrollbar-thumb { background: rgba(59,130,246,0.45); border: 2px solid rgba(15,23,42,1); border-radius: 999px; }
                .feature-list::-webkit-scrollbar-track { background: rgba(148,163,184,0.12); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; text-shadow: 0 1px 0 rgba(0,0,0,0.55); }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }
                .testimonial-list > * { border-radius: 1px; border: 2px solid rgba(59,130,246,0.22); background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(241,245,249,0.92)); box-shadow: 4px 4px 0 rgba(59,130,246,0.18); padding: var(--space-card); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.partner-grid { filter: saturate(1.05) contrast(1.02); }
.partner-grid > * { outline: 2px solid rgba(59,130,246,0.25); outline-offset: 4px; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid { border-top: 2px solid rgba(59,130,246,0.35); }
.stats-grid > * { border: 2px solid rgba(148,163,184,0.20); background: linear-gradient(180deg, rgba(15,23,42,0.55), rgba(15,23,42,0.35)); color: rgba(230,237,247,0.98); border-radius: 0px; box-shadow: 4px 4px 0 rgba(59,130,246,0.18); }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }
.cta-inner { background: linear-gradient(90deg, rgba(59,130,246,0.18), rgba(148,163,184,0.06)); border: 2px solid rgba(59,130,246,0.32); border-radius: 2px; padding: 0.75rem; }
.cta-inner > * { box-shadow: inset 0 0 0 2px rgba(255,255,255,0.05); }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { border-color: rgba(59,130,246,0.95); }
.hero, [class*="hero"], section:first-of-type { backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px); }
.card { caret-color: var(--color-accent); accent-color: var(--color-accent); }
input::placeholder, textarea::placeholder { color: rgba(226,232,240,0.6); }
::selection { background: rgba(59,130,246,0.35); color: #ffffff; }

/* 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; }
}