:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e40af;
    --color-accent: #d946ef;
    --color-surface: #eef2ff;
    --color-text: #0f172a;
    --rgb-primary: 29,78,216;
    --rgb-accent: 217,70,239;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, .04), 0 10px 22px rgba(29, 78, 216, .12);
    --shadow-md: 0 1px 0 rgba(15, 23, 42, .03), 0 16px 38px rgba(29, 78, 216, .18), 0 2px 10px rgba(217, 70, 239, .10);
    --shadow-lg: 0 1px 0 rgba(15, 23, 42, .03), 0 26px 70px rgba(29, 78, 216, .24), 0 6px 20px rgba(217, 70, 239, .16);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.55s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.65;
    --ring: rgba(29, 78, 216, .35);
    --ring-2: rgba(217, 70, 239, .28);
}

body { color: var(--color-text); line-height: var(--body-line-height); background:
    radial-gradient(1200px 700px at 10% -10%, rgba(var(--rgb-primary), .18), transparent 55%),
    radial-gradient(900px 560px at 90% 0%, rgba(var(--rgb-accent), .16), transparent 55%),
    linear-gradient(180deg, rgba(238,242,255,.0), rgba(238,242,255,.12));
}

h1, h2, h3, h4 { font-weight: var(--heading-weight); letter-spacing: -0.01em; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }

.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 1px 0 rgba(15, 23, 42, .04),
        0 10px 24px rgba(29, 78, 216, .14),
        0 26px 60px rgba(217, 70, 239, .10);
    transition: var(--transition);
    background:
        radial-gradient(900px 300px at 20% 0%, rgba(var(--rgb-accent), .18), transparent 55%),
        radial-gradient(700px 260px at 100% 30%, rgba(var(--rgb-primary), .18), transparent 52%),
        linear-gradient(180deg, rgba(255,255,255,.85), rgba(255,255,255,.65));
    border: 1px solid rgba(29, 78, 216, .10);
}

.card { backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 10px 28px rgba(29, 78, 216, .14);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.35);
}

a:not([class]):focus,
.btn:focus,
button[class*="btn"]:focus,
a[class*="btn"]:focus {
    outline: 2px solid rgba(29, 78, 216, .42);
    outline-offset: 2px;
}

::selection { background: rgba(var(--rgb-accent), .22); color: var(--color-text); }
caret-color: var(--color-accent);
accent-color: var(--color-accent);

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }

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

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

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid > * { border-radius: var(--radius-md); }
.stats-grid > * { box-shadow:
    0 1px 0 rgba(15, 23, 42, .03),
    0 14px 34px rgba(29, 78, 216, .12),
    0 10px 26px rgba(217, 70, 239, .08);
    border: 1px solid rgba(29, 78, 216, .10);
    background:
        linear-gradient(135deg, rgba(255,255,255,.86), rgba(255,255,255,.62));
}

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(900px 380px at 15% 0%, rgba(var(--rgb-primary), .22), transparent 58%),
        radial-gradient(680px 360px at 92% 22%, rgba(var(--rgb-accent), .22), transparent 55%),
        linear-gradient(135deg, rgba(255,255,255,.82), rgba(238,242,255,.88));
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 1px 0 rgba(15, 23, 42, .03),
        0 22px 70px rgba(29, 78, 216, .18),
        0 14px 44px rgba(217, 70, 239, .12);
    border: 1px solid rgba(29, 78, 216, .10);
}

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

/* 条件性装饰 */
.card { border-left: 3px solid transparent; border-image: linear-gradient(180deg, rgba(var(--rgb-primary), .95), rgba(var(--rgb-accent), .9)) 1; }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(15, 23, 42, .04),
        0 10px 28px rgba(29, 78, 216, .14),
        0 18px 44px rgba(217, 70, 239, .10);
    background:
        radial-gradient(900px 260px at 20% 0%, rgba(var(--rgb-primary), .16), transparent 56%),
        radial-gradient(680px 240px at 90% 10%, rgba(var(--rgb-accent), .14), transparent 55%),
        linear-gradient(180deg, rgba(255,255,255,.74), rgba(255,255,255,.55));
    border-bottom: 1px solid rgba(29, 78, 216, .10);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}

header, .header, .navbar { border-radius: 0; }

/* 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; }
}