:root {
    --color-primary: #2a6df6;
    --color-primary-dark: #184bb8;
    --color-accent: #ff4d6d;
    --color-surface: #f7fbff;
    --color-text: #0b1b33;
    --rgb-primary: 42,109,246;
    --rgb-accent: 255,77,109;
    --radius-sm: 4px;
    --radius-md: 10px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 6px rgba(10, 25, 55, 0.10);
    --shadow-md: 0 4px 10px rgba(10, 25, 55, 0.12), 0 18px 35px -14px rgba(10, 25, 55, 0.18);
    --shadow-lg: 0 10px 26px -10px rgba(10, 25, 55, 0.16), 0 32px 70px -28px rgba(10, 25, 55, 0.22);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;
    --color-border: rgba(10, 25, 55, 0.14);
    --color-border-strong: rgba(10, 25, 55, 0.22);
    --shadow-focus: 0 0 0 4px rgba(42, 109, 246, 0.18), 0 10px 26px rgba(10, 25, 55, 0.12);
    --gradient-hero-1: #2a6df6;
    --gradient-hero-2: #8b5cf6;
    --gradient-hero-3: #ff4d6d;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 500px at 20% -10%, rgba(42,109,246,0.10), rgba(42,109,246,0) 60%), radial-gradient(900px 420px at 90% 0%, rgba(255,77,109,0.08), rgba(255,77,109,0) 55%), var(--color-surface); }
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: 22px;
    box-shadow:
        0 4px 8px rgba(0,0,0,0.05),
        0 20px 40px -10px rgba(0,0,0,0.12),
        0 1px 0 rgba(255,255,255,0.55) inset;
    padding: var(--space-card);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        border-color var(--transition),
        color var(--transition),
        filter var(--transition);
    border: 1px solid rgba(10, 25, 55, 0.10);
    background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.78));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: 12px;
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        color var(--transition),
        border-color var(--transition),
        filter var(--transition);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:not([class]):hover { color: var(--color-accent); }

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

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

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* 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: 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; }

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

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 260px at 10% 10%, rgba(255,77,109,0.26), rgba(255,77,109,0) 60%),
        radial-gradient(700px 260px at 85% 20%, rgba(139,92,246,0.28), rgba(139,92,246,0) 62%),
        linear-gradient(135deg, var(--gradient-hero-1), var(--gradient-hero-2) 52%, var(--gradient-hero-3));
    border-radius: 24px;
    box-shadow:
        0 6px 14px rgba(0,0,0,0.06),
        0 28px 70px -28px rgba(0,0,0,0.20);
}
.card { border-left: 3px solid var(--color-accent); border-radius: 20px; box-shadow: var(--shadow-md); }
header, .header, .navbar { background: transparent; }

/* 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; }
}