:root {
    --bg: #f0f4f8;
    --panel: #ffffff;
    --ink: #333333;
    --muted: #5c6a7a;
    --line: #d8e0ea;
    --brand: #003366;
    --brand-soft: #0056b3;
    --brand-line: #007bff;
    --accent: #ffcc00;
    --accent-soft: #fff3cd;
    --shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Microsoft YaHei", Arial, sans-serif;
    background-color: var(--bg);
    color: var(--ink);
    line-height: 1.6;
}

a {
    color: var(--brand-soft);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.site-header {
    background: var(--brand);
    color: #ffffff;
    text-align: center;
}

.nav-shell {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px 0;
}

.brand {
    margin-bottom: 18px;
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.brand a {
    color: #ffffff;
    text-decoration: none;
}

.site-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    padding-bottom: 14px;
}

.site-nav a {
    color: #ffffff;
    padding: 8px 14px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.32);
    text-decoration: none;
}

.hero {
    max-width: 2000px;
    margin: 0 auto;
    padding: 72px 20px 90px;
}

.hero .eyebrow {
    margin: 0 0 14px;
    font-size: 1rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.8);
}

.hero h1 {
    margin: 0;
    font-size: clamp(2.6rem, 6vw, 4rem);
    line-height: 1.12;
}

.hero p {
    max-width: 780px;
    margin: 18px auto 0;
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.92);
}

.hero .dates {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
}

.hero .location {
    margin-top: 10px;
    font-size: 1.35rem;
    color: #ffffff;
}

main {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px 20px;
}

.panel {
    margin-bottom: 40px;
    padding: 20px;
    background: var(--panel);
    box-shadow: var(--shadow);
    border-radius: 8px;
}

.panel[id] {
    scroll-margin-top: 24px;
}

.panel h2 {
    margin: 0 0 18px;
    padding-bottom: 10px;
    color: var(--brand-soft);
    font-size: 2rem;
    border-bottom: 2px solid var(--brand-line);
}

.panel h3 {
    margin: 20px 0 10px;
    color: var(--brand);
}

.panel p:first-of-type,
.panel ul:first-of-type,
.panel ol:first-of-type {
    margin-top: 0;
}

.lede {
    font-size: 1.08rem;
    color: var(--muted);
}

.card-grid,
.link-grid {
    display: grid;
    gap: 18px;
    margin-top: 24px;
}

.card-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.link-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card,
.link-card,
.note {
    padding: 18px 20px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f9fbfd;
}

.card strong,
.link-card strong {
    display: block;
    margin-bottom: 8px;
    color: var(--brand);
}

.link-card {
    color: inherit;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.link-card:hover {
    transform: translateY(-2px);
    border-color: var(--brand-soft);
    text-decoration: none;
}

.meta-list,
.speaker-list,
.info-list,
.contact-list {
    margin: 0;
    padding-left: 22px;
}

.meta-list li,
.speaker-list li,
.info-list li,
.contact-list li {
    margin-bottom: 10px;
}

.table-wrap {
    overflow-x: auto;
    margin-top: 18px;
}

table {
    width: 100%;
    min-width: 760px;
    border-collapse: collapse;
    background: #ffffff;
}

th,
td {
    padding: 12px 10px;
    border: 1px solid var(--line);
    text-align: center;
    vertical-align: middle;
}

th {
    background: #edf3fa;
    color: var(--brand-soft);
}

.highlight {
    background: var(--accent-soft);
}

.note {
    border-left: 4px solid var(--brand-soft);
    background: #f5f9fe;
}

.split {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.9fr);
    gap: 24px;
}

.map-frame {
    width: 100%;
    min-height: 360px;
    border: 0;
    border-radius: 8px;
}

.auth-overlay {
    display: flex;
    justify-content: center;
    margin-bottom: 24px;
}

.auth-card {
    width: min(420px, 100%);
    padding: 28px 24px;
    border-radius: 12px;
    background: #ffffff;
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.18);
}

.auth-card h2 {
    margin: 0 0 10px;
    color: var(--brand);
    font-size: 1.6rem;
}

.auth-card p {
    margin: 0;
    color: var(--muted);
}

.auth-form {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.auth-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--ink);
}

.auth-input:focus {
    outline: 2px solid rgba(0, 123, 255, 0.2);
    border-color: var(--brand-line);
}

.auth-button {
    padding: 12px 14px;
    border: 0;
    border-radius: 8px;
    background: var(--brand);
    color: #ffffff;
    font-size: 1rem;
    cursor: pointer;
}

.auth-button:hover {
    background: var(--brand-soft);
}

.auth-error {
    min-height: 1.4em;
    color: #b42318;
    font-size: 0.95rem;
}

.protected-content.auth-locked {
    filter: blur(6px);
    pointer-events: none;
    user-select: none;
}

.site-footer {
    padding: 20px;
    background: #333333;
    color: #ffffff;
}

.footer-inner {
    position: relative;
    max-width: 1200px;
    min-height: 100px;
    margin: 0 auto;
    padding: 20px 80px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 20px;
}

.footer-logo {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.footer-copy {
    text-align: center;
}

.footer-copy p {
    margin: 4px 0;
}

@media (max-width: 900px) {
    .hero {
        padding: 60px 20px 72px;
    }

    .split {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        padding: 20px;
        grid-template-columns: 1fr;
        justify-items: center;
    }
}

@media (max-width: 640px) {
    .nav-shell {
        padding-top: 18px;
    }

    .brand {
        font-size: 1.2rem;
    }

    .site-nav a {
        padding: 7px 12px;
        font-size: 0.95rem;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p,
    .hero .dates,
    .hero .location {
        font-size: 1.05rem;
    }

    main {
        margin: 28px auto;
        padding: 0 14px 12px;
    }

    .panel {
        padding: 18px 16px;
    }

    .panel h2 {
        font-size: 1.6rem;
    }

    .auth-card {
        padding: 22px 18px;
    }
}