:root {
    --color-primary: #334155;
    --color-primary-dark: #0f172a;
    --color-accent: #6366f1;
    --color-surface: #f8fafc;
    --color-text: #0b1220;
    --rgb-primary: 51,65,85;
    --rgb-accent: 99,102,241;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 26px;

    --shadow-sm: 0 1px 0 rgba(15,23,42,.06), 0 10px 24px rgba(15,23,42,.08);
    --shadow-md: 0 2px 0 rgba(15,23,42,.05), 0 14px 34px rgba(15,23,42,.10), 0 2px 10px rgba(99,102,241,.08);
    --shadow-lg: 0 1px 0 rgba(15,23,42,.05), 0 22px 55px rgba(15,23,42,.14), 0 10px 22px rgba(99,102,241,.12);

    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;

    --transition: 0.52s cubic-bezier(.2,.8,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.6;

    --border-soft: rgba(15,23,42,.10);
    --focus-ring: rgba(99,102,241,.35);
    --glow-accent: rgba(99,102,241,.20);
    --glow-accent-2: rgba(14,165,233,.18);
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(1200px 600px at 20% -10%, rgba(99,102,241,.10) 0%, rgba(99,102,241,0) 55%),
                radial-gradient(1000px 520px at 85% 10%, rgba(14,165,233,.10) 0%, rgba(14,165,233,0) 55%),
                linear-gradient(180deg, #f8fafc 0%, #ffffff 65%);
}

h1, h2, h3, h4 { font-weight: var(--heading-weight); }

section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background:
        linear-gradient(180deg, rgba(255,255,255,.78) 0%, rgba(255,255,255,.35) 100%);
}

.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 1px 0 rgba(15,23,42,.06),
        0 10px 28px rgba(15,23,42,.10),
        0 4px 12px rgba(99,102,241,.10);
    padding: var(--space-card);
    transition: var(--transition);
    background:
        radial-gradient(120% 90% at 10% 0%, rgba(99,102,241,.14) 0%, rgba(99,102,241,0) 55%),
        radial-gradient(110% 90% at 100% 0%, rgba(14,165,233,.12) 0%, rgba(14,165,233,0) 52%),
        linear-gradient(180deg, #ffffff 0%, rgba(255,255,255,.88) 100%);
    border: 1px solid rgba(var(--rgb-primary), .10);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 1px 0 rgba(15,23,42,.06),
        0 12px 30px rgba(99,102,241,.18);
    background:
        linear-gradient(135deg, rgba(99,102,241,.98) 0%, rgba(14,165,233,.90) 100%);
    border: 1px solid rgba(255,255,255,.24);
}

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

a:not([class]):focus, button:focus, .btn:focus, .navbar a:focus {
    outline: 2px solid var(--focus-ring);
    outline-offset: 3px;
}

:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 3px;
}

/* ========== 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;
                    border-radius: calc(var(--radius-lg) - 2px);
                    box-shadow:
                        0 1px 0 rgba(15,23,42,.06),
                        0 16px 40px rgba(15,23,42,.12),
                        0 4px 18px rgba(14,165,233,.10);
                }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.feature-list .card {
    background:
        linear-gradient(180deg, rgba(255,255,255,.95) 0%, rgba(248,250,252,.86) 100%);
    box-shadow:
        0 1px 0 rgba(15,23,42,.06),
        0 10px 26px rgba(15,23,42,.10),
        0 2px 10px rgba(99,102,241,.10);
}

/* 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 {
                    background:
                        radial-gradient(1000px 520px at 15% 15%, rgba(99,102,241,.20) 0%, rgba(99,102,241,0) 55%),
                        radial-gradient(900px 480px at 85% 10%, rgba(14,165,233,.18) 0%, rgba(14,165,233,0) 52%),
                        linear-gradient(135deg, rgba(15,23,42,.06) 0%, rgba(15,23,42,0) 45%),
                        linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
                }

                .hero:before {
                    content: "";
                    position: absolute;
                    inset: -1px;
                    pointer-events: none;
                    background:
                        conic-gradient(from 200deg at 50% 50%,
                            rgba(99,102,241,.00) 0deg,
                            rgba(99,102,241,.18) 70deg,
                            rgba(14,165,233,.16) 145deg,
                            rgba(99,102,241,.00) 220deg,
                            rgba(99,102,241,.00) 360deg);
                    opacity: .55;
                    filter: blur(22px) saturate(1.2);
                    transform: translateZ(0);
                }

/* 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 {
                    background:
                        radial-gradient(120% 90% at 0% 0%, rgba(14,165,233,.16) 0%, rgba(14,165,233,0) 58%),
                        radial-gradient(120% 100% at 100% 0%, rgba(99,102,241,.14) 0%, rgba(99,102,241,0) 60%),
                        linear-gradient(180deg, rgba(255,255,255,.96) 0%, rgba(248,250,252,.88) 100%);
                    box-shadow:
                        0 1px 0 rgba(15,23,42,.05),
                        0 18px 45px rgba(15,23,42,.11),
                        0 3px 12px rgba(99,102,241,.10);
                }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.partner-grid .card {
    background:
        linear-gradient(180deg, rgba(255,255,255,.95) 0%, rgba(248,250,252,.85) 100%);
    box-shadow:
        0 1px 0 rgba(15,23,42,.05),
        0 12px 32px rgba(15,23,42,.10);
}

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card {
    border-radius: calc(var(--radius-lg) + 2px);
    background:
        linear-gradient(135deg, rgba(99,102,241,.12) 0%, rgba(14,165,233,.10) 55%, rgba(255,255,255,.94) 100%);
    box-shadow:
        0 1px 0 rgba(15,23,42,.06),
        0 16px 42px rgba(15,23,42,.12),
        0 4px 16px rgba(14,165,233,.10);
}

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }
                .stats-grid .card {
                    background:
                        radial-gradient(90% 80% at 20% 0%, rgba(99,102,241,.16) 0%, rgba(99,102,241,0) 55%),
                        linear-gradient(180deg, rgba(255,255,255,.95) 0%, rgba(248,250,252,.88) 100%);
                    box-shadow:
                        0 1px 0 rgba(15,23,42,.05),
                        0 14px 36px rgba(15,23,42,.10);
                }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }
.cta-inner .card {
    background:
        radial-gradient(120% 90% at 50% 0%, rgba(99,102,241,.22) 0%, rgba(99,102,241,0) 60%),
        radial-gradient(100% 80% at 20% 100%, rgba(14,165,233,.18) 0%, rgba(14,165,233,0) 55%),
        linear-gradient(180deg, rgba(255,255,255,.98) 0%, rgba(248,250,252,.90) 100%);
    box-shadow:
        0 1px 0 rgba(15,23,42,.05),
        0 20px 55px rgba(15,23,42,.14),
        0 8px 22px rgba(99,102,241,.14);
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 1px 0 rgba(15,23,42,.06),
        0 26px 70px rgba(15,23,42,.18),
        0 10px 28px rgba(99,102,241,.18),
        0 4px 18px rgba(14,165,233,.12);
}

a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 8px 24px rgba(99,102,241,.20);
}

/* Preserve original border selector, but upgrade its style (color/style only) */
.card { border: 1px solid rgba(var(--rgb-primary), .12); }
.card:hover { border-color: rgba(var(--rgb-primary), .18); }

header, .header, .navbar {
    background: transparent;
    backdrop-filter: blur(10px) saturate(1.05);
    -webkit-backdrop-filter: blur(10px) saturate(1.05);
}

/* 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; }

    .card, [class*="card"] { transition-duration: 0.46s; }
}