:root {
    --color-primary: #1f2937;
    --color-primary-dark: #0b1220;
    --color-accent: #2dd4bf;
    --color-surface: #f3f7ff;
    --color-text: #0b1220;
    --rgb-primary: 31,41,55;
    --rgb-accent: 45,212,191;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 18px;
    --radius-xl: 22px;
    --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.10), 0 18px 45px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 6px 18px rgba(2, 6, 23, 0.12), 0 30px 70px rgba(2, 6, 23, 0.12);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 1rem;
    --transition: 0.42s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, rgba(243,247,255,1) 0%, rgba(243,247,255,0.55) 100%); }
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: 0 4px 10px rgba(2, 6, 23, 0.06), 0 14px 30px rgba(2, 6, 23, 0.10), 0 1px 0 rgba(255, 255, 255, 0.6) inset;
    padding: var(--space-card);
    transition: box-shadow var(--transition), transform var(--transition), background-color var(--transition), border-color var(--transition), filter var(--transition);
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid rgba(15, 23, 42, 0.10);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: background-color var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
a:not([class]) { color: #0ea5e9; transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,0.7); }

:focus, :focus-visible { outline: 2px solid rgba(45,212,191,0.55); outline-offset: 2px; border-radius: var(--radius-sm); }
::selection { background: rgba(45,212,191,0.22); color: var(--color-text); }

.card { border-left: 4px solid rgba(14,165,233,0.85); }
header, .header, .navbar { background: transparent; }

@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: 0.9rem; --radius-md: 10px; --radius-lg: 18px; --transition: 0.38s cubic-bezier(0.2, 0.9, 0.2, 1); }
    .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; }
}

/* ========== 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-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* 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: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: full-bg */
.cta-section {
    background: radial-gradient(1200px 600px at 20% 0%, rgba(45,212,191,0.35) 0%, rgba(45,212,191,0) 55%),
                radial-gradient(900px 480px at 100% 20%, rgba(14,165,233,0.35) 0%, rgba(14,165,233,0) 52%),
                linear-gradient(180deg, #151f2e 0%, #0b1220 100%);
    color: #f1f5ff;
    padding: 4rem 2rem;
    box-shadow: 0 -1px 0 rgba(255,255,255,0.08) inset;
}
.cta-section a:not([class]) { color: rgba(45,212,191,0.95); }
.cta-section .card, .cta-section [class*="card"] {
    background: rgba(15, 23, 42, 0.22);
    border-color: rgba(226, 232, 240, 0.14);
    box-shadow: 0 10px 25px rgba(0,0,0,0.22), 0 1px 0 rgba(255,255,255,0.10) inset;
}
.cta-section .btn, .cta-section button[class*="btn"], .cta-section a[class*="btn"] {
    border-color: rgba(45,212,191,0.45);
    color: rgba(241,245,255,0.98);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25), 0 1px 0 rgba(255,255,255,0.10) inset;
    background: linear-gradient(180deg, rgba(45,212,191,0.20) 0%, rgba(45,212,191,0.06) 100%);
}
.cta-section .btn:hover, .cta-section button[class*="btn"]:hover, .cta-section a[class*="btn"]:hover {
    filter: saturate(1.1) brightness(1.02);
    transform: translateY(-1px);
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.30), 0 1px 0 rgba(255,255,255,0.14) inset;
}

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