:root {
    --bg: #f6f9ff;
    --surface: rgba(255, 255, 255, 0.86);
    --surface-soft: rgba(255, 255, 255, 0.74);
    --text: #10223d;
    --text-muted: #52627a;
    --brand: #4f7cff;
    --brand-2: #13b3e6;
    --border: rgba(16, 34, 61, 0.12);
    --shadow: 0 12px 32px rgba(17, 40, 72, 0.12);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
    text-decoration: none;
}

.page-bg {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at 15% 15%, rgba(79, 124, 255, 0.16), transparent 38%),
        radial-gradient(circle at 80% 5%, rgba(19, 179, 230, 0.12), transparent 32%),
        radial-gradient(circle at 80% 80%, rgba(88, 214, 163, 0.12), transparent 35%);
    pointer-events: none;
    z-index: 0;
}

.container {
    width: min(1080px, 92vw);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(10px);
    background: rgba(246, 249, 255, 0.84);
    border-bottom: 1px solid rgba(16, 34, 61, 0.08);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    padding: 14px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
}

.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
    color: #ffffff;
    font-size: 13px;
}

.brand-text {
    font-size: 16px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 18px;
    color: var(--text-muted);
}

.nav-links a {
    padding: 6px 2px;
    border-bottom: 2px solid transparent;
}

.nav-links a.active,
.nav-links a:hover {
    color: var(--text);
    border-bottom-color: rgba(79, 124, 255, 0.9);
}

.hero {
    position: relative;
    z-index: 1;
    padding: 84px 0 52px;
}

.hero-small {
    padding-bottom: 34px;
}

.hero-content {
    text-align: center;
}

.badge {
    display: inline-block;
    margin: 0;
    padding: 7px 12px;
    border-radius: 999px;
    border: 1px solid rgba(26, 149, 109, 0.4);
    background: rgba(88, 214, 163, 0.2);
    color: #0f8a63;
    font-size: 12px;
    font-weight: 600;
}

h1 {
    margin: 16px auto;
    max-width: 900px;
    font-size: clamp(32px, 6vw, 54px);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-desc {
    width: min(780px, 92%);
    margin: 0 auto;
    color: var(--text-muted);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 28px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 1px solid transparent;
    padding: 10px 16px;
    font-weight: 600;
    font-size: 14px;
    transition: 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn.primary {
    color: #ffffff;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
}

.btn.secondary {
    color: var(--text);
    border-color: var(--border);
    background: #ffffff;
}

.section {
    position: relative;
    z-index: 1;
    padding: 38px 0 42px;
}

.card-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.info-card {
    border: 1px solid var(--border);
    border-radius: 18px;
    background: linear-gradient(180deg, #ffffff, #f7fbff);
    box-shadow: var(--shadow);
    padding: 24px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.info-card:hover {
    transform: translateY(-2px);
    border-color: rgba(79, 124, 255, 0.4);
}

.info-card h2 {
    margin: 0 0 12px;
    font-size: 24px;
    letter-spacing: -0.01em;
}

.info-card p,
.info-card li {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.85;
    font-size: 16px;
}

.info-card ul {
    margin: 0;
    padding-left: 18px;
}

.info-card p + p,
.info-card p + ul,
.info-card ul + p {
    margin-top: 10px;
}

.inline-link {
    color: #93e8ff;
    font-weight: 600;
}

.inline-link:hover {
    text-decoration: underline;
}

.lead-card {
    max-width: 920px;
    margin: 0 auto;
    background:
        linear-gradient(120deg, rgba(79, 124, 255, 0.14), transparent 45%),
        linear-gradient(180deg, #ffffff, #f4f9ff);
}

.site-footer {
    position: relative;
    z-index: 1;
    padding: 34px 0 42px;
    border-top: 1px solid rgba(16, 34, 61, 0.08);
    margin-top: auto;
}

main {
    flex: 1 0 auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    color: var(--text-muted);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 14px;
}

.footer-links a:hover {
    color: var(--text);
}

@media (max-width: 720px) {
    .nav-links {
        gap: 12px;
        font-size: 14px;
    }

    .info-card {
        padding: 18px;
    }

    .info-card h2 {
        font-size: 21px;
    }

    .info-card p,
    .info-card li {
        font-size: 15px;
    }
}