:root {
    --color-primary: #2b6cb0;
    --color-primary-dark: #0b1b33;
    --color-accent: #7c3aed;
    --color-surface: #f8fafc;
    --color-text: #0b1220;

    --rgb-primary: 43,108,176;
    --rgb-accent: 124,58,237;

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 6px 18px rgba(11,18,32,.08);
    --shadow-md: 0 14px 40px rgba(11,18,32,.14), 0 2px 10px rgba(11,18,32,.06);
    --shadow-lg: 0 26px 70px rgba(11,18,32,.18), 0 10px 26px rgba(11,18,32,.08);

    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;

    --transition: 560ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 750;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: #f6f8ff; }
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: calc(var(--radius-lg) + 6px);
    box-shadow:
        0 18px 55px rgba(10, 20, 40, .18),
        0 6px 18px rgba(10, 20, 40, .10),
        inset 0 1px 0 rgba(255,255,255,.70);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(255,255,255,.66));
    border: 1px solid rgba(24, 34, 56, .10);
    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 26px rgba(124, 58, 237, .18), 0 2px 8px rgba(11, 18, 32, .10);
    border: 1px solid rgba(124, 58, 237, .35);
    color: #ffffff;
    background: linear-gradient(135deg, rgba(124,58,237,1) 0%, rgba(43,108,176,1) 100%);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
    background: linear-gradient(90deg, rgba(43,108,176,1), rgba(124,58,237,1));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

a:not([class]):hover,
a:not([class]):focus {
    filter: saturate(1.1);
    text-shadow: 0 10px 22px rgba(43,108,176,.18);
}

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid {
                    display: grid;
                    grid-template-columns: repeat(4, 1fr);
                    gap: 24px;
                    align-items: baseline;
                }

/* features: horizontal */
/* 水平滚动 */
                .feature-list {
                    display: flex;
                    gap: 24px;
                    overflow-x: auto;
                    scroll-snap-type: x mandatory;
                    scroll-behavior: smooth;
                    padding-bottom: 6px;
                }
                .feature-list > * {
                    flex: 0 0 320px;
                    scroll-snap-align: start;
                    border-radius: var(--radius-lg);
                    border: 1px solid rgba(24, 34, 56, .10);
                    background: linear-gradient(180deg, rgba(255,255,255,.78), rgba(255,255,255,.56));
                    box-shadow:
                        0 14px 40px rgba(10, 20, 40, .14),
                        0 4px 14px rgba(10, 20, 40, .08),
                        inset 0 1px 0 rgba(255,255,255,.66);
                }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero {
                    position: relative;
                    min-height: 70vh;
                    display: flex;
                    align-items: center;
                }
                .hero-content { position: relative; z-index: 1; }
                .hero::before {
                    content: "";
                    position: absolute;
                    inset: 0;
                    background:
                        radial-gradient(1200px 500px at 15% 20%, rgba(124,58,237,.35), transparent 60%),
                        radial-gradient(900px 420px at 85% 30%, rgba(43,108,176,.35), transparent 55%),
                        linear-gradient(135deg, #0b1b33, #12345b 45%, #6d28d9 120%);
                    opacity: .95;
                    filter: saturate(1.05) contrast(1.02);
                    z-index: 0;
                }
                .hero > * { position: relative; z-index: 1; }

/* testimonials: grid-3 */
.testimonial-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: baseline;
}

/* partners: grid-4 */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 36px;
    align-items: center;
}

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }
                .faq-wrapper { align-items: start; }
                .faq-wrapper, .faq-wrapper * { caret-color: var(--color-accent); }

/* stats: grid-4 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
    align-items: baseline;
}

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(700px 240px at 20% 0%, rgba(124,58,237,.20), transparent 60%),
        radial-gradient(520px 240px at 80% 10%, rgba(43,108,176,.18), transparent 62%),
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.70));
    border-radius: calc(var(--radius-xl) + 4px);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 22px 70px rgba(10, 20, 40, .18),
        0 10px 30px rgba(10, 20, 40, .10),
        inset 0 1px 0 rgba(255,255,255,.76);
    border: 1px solid rgba(24, 34, 56, .12);
}

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(1100px 480px at 20% 10%, rgba(124,58,237,.35), transparent 60%),
        radial-gradient(900px 420px at 80% 25%, rgba(43,108,176,.30), transparent 55%),
        linear-gradient(135deg, #0b1b33 0%, #133a62 45%, #6d28d9 115%);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.22);
    border-radius: calc(var(--radius-xl) + 10px);
}

.card { 
    border-left: 4px solid;
    border-left-color: rgba(124,58,237,.95);
}

header, .header, .navbar {
    background: transparent;
    box-shadow: none;
    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; }
    .news-grid, .testimonial-list, .stats-grid { gap: 20px; }
    .feature-list { gap: 20px; }
    .partner-grid { gap: 28px; }
}
@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; }

    .news-grid, .testimonial-list, .stats-grid { gap: 16px; }
    .feature-list { gap: 16px; }
    .partner-grid { gap: 20px; }

    .card, [class*="card"] {
        border-radius: 22px;
        box-shadow:
            0 16px 46px rgba(10, 20, 40, .16),
            0 4px 16px rgba(10, 20, 40, .08),
            inset 0 1px 0 rgba(255,255,255,.72);
    }
}