:root {
    --brand-blue: #2b6de9;
    --brand-deep: #0e3f87;
    --brand-cyan: #68d2ff;
    --ink: #1f2a37;
    --muted: #5c6d82;
    --surface: rgba(255, 255, 255, 0.94);
    --line: rgba(43, 109, 233, 0.14);
    --shadow-soft: 0 10px 28px rgba(20, 30, 44, 0.08);
    --shadow-strong: 0 18px 44px rgba(20, 30, 44, 0.14);
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: light;
}

body {
    margin: 0;
    font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.7;
    color: var(--ink);
    background:
        radial-gradient(circle at 84% -8%, rgba(104, 210, 255, 0.22), transparent 32%),
        radial-gradient(circle at 8% 18%, rgba(43, 109, 233, 0.08), transparent 30%),
        linear-gradient(180deg, #f4f7fb 0%, #eef3fa 100%);
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.84);
    border-bottom: 1px solid rgba(255, 255, 255, 0.76);
    box-shadow: 0 8px 24px rgba(18, 33, 54, 0.08);
}

.site-shell {
    width: min(1080px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header .site-shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 16px 0;
}

.brand {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: 0.03em;
    color: #112540;
}

.top-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.top-nav a {
    padding: 8px 14px;
    border-radius: 999px;
    color: #43556d;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.top-nav a:hover,
.top-nav a.active {
    color: var(--brand-deep);
    background: rgba(255, 255, 255, 0.92);
    border-color: var(--line);
    box-shadow: 0 6px 14px rgba(18, 33, 54, 0.08);
}

.page-main {
    padding: 54px 0 72px;
}

.hero-card {
    position: relative;
    overflow: hidden;
    padding: 34px;
    border-radius: 28px;
    background:
        radial-gradient(circle at 80% 0%, rgba(104, 210, 255, 0.2), transparent 34%),
        linear-gradient(130deg, #0f4da6 0%, var(--brand-blue) 54%, #2d8cf0 100%);
    color: #fff;
    box-shadow: var(--shadow-strong);
}

.hero-card::after {
    content: "";
    position: absolute;
    inset: auto -80px -140px auto;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.16), transparent 68%);
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
    font-size: 13px;
    letter-spacing: 0.06em;
}

.hero-card h1 {
    margin: 16px 0 10px;
    font-size: clamp(32px, 5vw, 48px);
    line-height: 1.08;
}

.hero-card p {
    margin: 0;
    max-width: 760px;
    color: rgba(255, 255, 255, 0.9);
}

.content-grid {
    display: grid;
    gap: 18px;
    margin-top: 22px;
}

.support-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 24px;
    box-shadow: var(--shadow-soft);
}

.support-card h2 {
    margin: 0 0 12px;
    font-size: 22px;
    color: #183764;
}

.support-card h3 {
    margin: 18px 0 8px;
    font-size: 16px;
    color: #1d477f;
}

.support-card p {
    margin: 0 0 12px;
    color: var(--muted);
}

.support-card p:last-child {
    margin-bottom: 0;
}

.support-list {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
}

.support-list li + li {
    margin-top: 8px;
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 18px;
}

.action-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 18px;
    border-radius: 999px;
    border: 1px solid rgba(43, 109, 233, 0.18);
    background: rgba(255, 255, 255, 0.98);
    color: #2357a0;
    font-weight: 600;
    box-shadow: 0 8px 18px rgba(16, 43, 82, 0.08);
    transition: all 0.2s ease;
}

.action-chip.primary {
    border-color: transparent;
    background: linear-gradient(140deg, #2b6de9 0%, #1f62dd 100%);
    color: #fff;
}

.action-chip:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 24px rgba(16, 43, 82, 0.14);
}

.muted-note {
    font-size: 13px;
    color: #6f7f95;
}

.site-footer {
    padding: 0 0 44px;
}

.site-footer .site-shell {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 14px;
    padding-top: 18px;
    border-top: 1px solid rgba(35, 96, 178, 0.12);
    color: #70819a;
    font-size: 13px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-links a:hover {
    color: #214d8a;
}

@media (max-width: 720px) {
    .site-header .site-shell {
        align-items: flex-start;
        flex-direction: column;
    }

    .page-main {
        padding-top: 28px;
    }

    .hero-card,
    .support-card {
        padding: 22px;
    }

    .site-footer .site-shell {
        flex-direction: column;
    }
}