/* ========== MXQX_Site 入口页样式 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg-start: #f5ebe0;
    --bg-end: #ede0cf;
    --fg-main: #3c3226;
    --fg-sub: #8a7a66;
    --card-bg: #fffdf7;
    --card-border: rgba(208, 196, 180, 0.5);
    --card-shadow: 0 8px 30px rgba(180, 165, 140, 0.15);
    --card-shadow-hover: 0 16px 48px rgba(180, 165, 140, 0.3);
    --accent: #d4a574;
    --brand: #3c3226;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-start: #1a1a2e;
        --bg-end: #16213e;
        --fg-main: #e0d5c5;
        --fg-sub: #8a8a9a;
        --card-bg: #1e1e2e;
        --card-border: rgba(255, 255, 255, 0.08);
        --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
        --card-shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.6);
        --accent: #d4a574;
        --brand: #e0d5c5;
    }
}

html, body {
    min-height: 100vh;
    font-family: "Noto Serif SC", "PingFang SC", "Microsoft YaHei", serif;
    background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
    color: var(--fg-main);
    -webkit-font-smoothing: antialiased;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    min-height: 100vh;
}

.portal-brand {
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    color: var(--brand);
    margin-bottom: 0.5rem;
    text-align: center;
    user-select: none;
}

.portal-tagline {
    font-size: 0.95rem;
    color: var(--fg-sub);
    margin-bottom: 3rem;
    letter-spacing: 0.15em;
}

.portal-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    width: 100%;
    max-width: 780px;
}

.portal-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1.5rem;
    box-shadow: var(--card-shadow);
    text-decoration: none;
    color: inherit;
    transition: transform 0.28s ease, box-shadow 0.28s ease;
    position: relative;
    overflow: hidden;
}

.portal-card::before {
    content: "";
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(212, 165, 116, 0.08), transparent);
    transition: left 0.6s ease;
}

.portal-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--card-shadow-hover);
}

.portal-card:hover::before {
    left: 100%;
}

.portal-icon {
    font-size: 3.2rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.08));
}

.portal-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--fg-main);
    letter-spacing: 0.1em;
}

.portal-desc {
    font-size: 0.88rem;
    color: var(--fg-sub);
    letter-spacing: 0.05em;
    text-align: center;
}

.portal-footer {
    margin-top: 4rem;
    font-size: 0.75rem;
    color: var(--fg-sub);
    letter-spacing: 0.15em;
    opacity: 0.7;
}

@media (max-width: 480px) {
    .portal-brand { font-size: 2.2rem; }
    .portal-card { padding: 2.2rem 1.5rem; }
    .portal-icon { font-size: 2.6rem; }
}