:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #f97316;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 14,165,233;
    --rgb-accent: 249,115,22;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 22px;

    --shadow-sm: 0 3px 10px rgba(2, 6, 23, 0.08), 0 1px 0 rgba(255,255,255,0.55) inset;
    --shadow-md: 0 4px 12px rgba(2, 6, 23, 0.08), 0 18px 35px -14px rgba(2, 6, 23, 0.16);
    --shadow-lg: 0 8px 22px rgba(2, 6, 23, 0.10), 0 34px 70px -22px rgba(2, 6, 23, 0.20);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.42s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); }

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-xl);
    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(255,255,255,0.6) inset;
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,0.82), rgba(248,250,252,0.78));
    border: 1px solid rgba(2, 6, 23, 0.06);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 10px 26px -18px rgba(2, 6, 23, 0.28),
        0 1px 0 rgba(255,255,255,0.55) inset;
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
    text-decoration-color: rgba(14, 165, 233, 0.35);
}

a:not([class]):hover { color: var(--color-accent); text-decoration-color: rgba(249, 115, 22, 0.55); }

.card { border-left: 3px solid var(--color-primary); }

header, .header, .navbar { background: transparent; }

@media (prefers-reduced-motion: reduce) {
    * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card {
                    display: grid;
                    grid-template-columns: 280px 1fr;
                    box-shadow:
                        0 4px 8px rgba(0,0,0,0.05),
                        0 20px 40px -10px rgba(0,0,0,0.12),
                        0 0 0 1px rgba(14, 165, 233, 0.08) inset;
                    border-radius: calc(var(--radius-xl) - 2px);
                }

/* features: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }
                .feature-list .card {
                    box-shadow:
                        0 4px 8px rgba(0,0,0,0.05),
                        0 20px 40px -10px rgba(0,0,0,0.12),
                        0 0 0 1px rgba(249, 115, 22, 0.10) inset;
                    border-radius: var(--radius-lg);
                    background:
                        radial-gradient(1000px 240px at 10% 0%, rgba(249, 115, 22, 0.18), transparent 55%),
                        linear-gradient(180deg, rgba(255,255,255,0.86), rgba(248,250,252,0.76));
                }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }
.hero-content .card {
    box-shadow:
        0 4px 10px rgba(0,0,0,0.06),
        0 22px 50px -18px rgba(2, 6, 23, 0.18),
        0 0 0 1px rgba(14, 165, 233, 0.10) inset;
    border-radius: var(--radius-xl);
}

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }
                .testimonial-list > * .card {
                    box-shadow:
                        0 4px 8px rgba(0,0,0,0.05),
                        0 20px 40px -10px rgba(0,0,0,0.12),
                        0 0 0 1px rgba(2, 6, 23, 0.05) inset;
                    border-radius: calc(var(--radius-lg) + 2px);
                    background:
                        linear-gradient(135deg, rgba(14,165,233,0.18), rgba(249,115,22,0.12) 45%, rgba(255,255,255,0.75));
                }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
                .partner-grid .card {
                    box-shadow:
                        0 4px 8px rgba(0,0,0,0.05),
                        0 20px 40px -10px rgba(0,0,0,0.12),
                        0 0 0 1px rgba(14, 165, 233, 0.08) inset;
                    border-radius: var(--radius-lg);
                }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list .card {
    box-shadow:
        0 4px 8px rgba(0,0,0,0.05),
        0 20px 40px -10px rgba(0,0,0,0.12),
        0 0 0 1px rgba(249, 115, 22, 0.10) inset;
    border-radius: var(--radius-xl);
    background:
        radial-gradient(700px 220px at 90% 10%, rgba(249,115,22,0.18), transparent 55%),
        linear-gradient(180deg, rgba(255,255,255,0.86), rgba(248,250,252,0.74));
}

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card {
    box-shadow:
        0 4px 8px rgba(0,0,0,0.05),
        0 20px 40px -10px rgba(0,0,0,0.12),
        0 0 0 1px rgba(14, 165, 233, 0.10) inset;
    border-radius: calc(var(--radius-xl) - 1px);
    background:
        conic-gradient(from 210deg at 50% 35%, rgba(14,165,233,0.20), rgba(249,115,22,0.14), rgba(14,165,233,0.10) 55%, rgba(255,255,255,0.75));
}

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(900px 360px at 10% 0%, rgba(255,255,255,0.18), transparent 55%),
        radial-gradient(700px 260px at 90% 20%, rgba(249, 115, 22, 0.30), transparent 52%),
        linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 60%, #0b4f7a 100%);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow:
        0 16px 60px -30px rgba(0,0,0,0.35),
        0 2px 0 rgba(255,255,255,0.08) inset;
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255,255,255,0.14);
}

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }
.page-main .card { scroll-margin-top: 1rem; }

/* 条件性装饰 */
header, .header, .navbar { color: var(--color-text); }

.news-grid .card { backdrop-filter: blur(8px); }
.faq-list .card { backdrop-filter: blur(10px); }
.stats-grid .card { backdrop-filter: blur(9px); }

@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; }
    .card, [class*="card"] { border-radius: 20px; }
}