:root {
    color-scheme: light dark;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
    --accent: #1d4ed8;
    --accent-hover: #1e40af;
    --error-bg: #fef2f2;
    --error-text: #b91c1c;
    --success-bg: #f0fdf4;
    --success-text: #166534;
    --radius: 0.75rem;
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
    --font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b1220;
        --surface: #111827;
        --text: #f8fafc;
        --muted: #94a3b8;
        --border: #334155;
        --accent: #60a5fa;
        --accent-hover: #93c5fd;
        --error-bg: #450a0a;
        --error-text: #fecaca;
        --success-bg: #052e16;
        --success-text: #bbf7d0;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

a {
    color: var(--accent);
}

a:hover {
    color: var(--accent-hover);
}

.container {
    width: min(960px, calc(100% - 2rem));
    max-width: 100%;
    margin-inline: auto;
}

.main-content {
    padding-block: 2rem;
    min-height: calc(100vh - 8rem);
    /* Overflow hier statt auf body — sonst wird das Menü-Dropdown abgeschnitten */
    overflow-x: clip;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-height: 3.25rem;
}

.logo {
    font-weight: 700;
    text-decoration: none;
    color: var(--text);
    flex-shrink: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-shrink: 0;
}

.header-btn {
    display: inline-block;
    padding: 0.4rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: transparent;
    color: var(--accent);
    text-decoration: none;
    font: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

.header-btn:hover {
    background: var(--bg);
    color: var(--accent-hover);
}

.header-filter-btn {
    display: none;
}

.nav-toggle {
    position: relative;
}

.nav-toggle summary {
    list-style: none;
    cursor: pointer;
    padding: 0.4rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-weight: 600;
}

.nav-toggle summary::-webkit-details-marker {
    display: none;
}

.site-nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.site-nav a {
    text-decoration: none;
}

/* Sprachumschalter im Menü */
.nav-lang {
    display: flex;
    gap: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

.lang-link {
    font-size: 0.8rem;
    color: var(--muted, #666);
    text-decoration: none;
    padding: 0.15rem 0.35rem;
    border-radius: 4px;
}

.lang-link--active {
    font-weight: 700;
    color: inherit;
    background: color-mix(in srgb, var(--border) 50%, transparent);
}

.inline-form {
    display: inline;
    margin: 0;
}

.link-button {
    background: none;
    border: none;
    padding: 0;
    color: var(--accent);
    cursor: pointer;
    font: inherit;
    text-decoration: underline;
}

.event-search {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.event-search input[type="search"] {
    flex: 1 1 10rem;
    min-width: 0;
    padding: 0.45rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font: inherit;
    font-size: 0.9rem;
}

.event-search .button {
    padding: 0.45rem 0.75rem;
    font-size: 0.9rem;
    white-space: nowrap;
}

.event-search--header {
    display: none;
    flex: 1 1 auto;
    min-width: 0;
    max-width: 36rem;
    margin: 0 0.5rem;
}

.event-search--menu {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    margin-bottom: 0.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.event-search--menu .button {
    width: 100%;
}

.nav-ics {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 899px) {
    .header-filter-btn {
        display: inline-block;
    }
}

@media (max-width: 640px) {
    .event-search--header {
        display: none !important;
    }

    .event-search--menu {
        display: flex;
    }

    .nav-ics {
        display: block;
        font-weight: 600;
    }

    .site-nav {
        position: absolute;
        right: 0;
        top: calc(100% + 0.5rem);
        z-index: 60;
        flex-direction: column;
        align-items: stretch;
        min-width: 16rem;
        padding: 0.75rem;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
    }
}

@media (min-width: 641px) {
    .event-search--header {
        display: flex;
        flex-wrap: nowrap;
    }

    .nav-toggle summary {
        display: none;
    }

    .nav-toggle .site-nav {
        display: flex;
    }
}

@media (min-width: 641px) and (max-width: 1100px) {
    .header-ics {
        /* kompakter auf mittleren Viewports */
        font-size: 0.8rem;
        padding: 0.45rem 0.55rem;
    }

    .logo {
        font-size: 0.95rem;
        max-width: 7.5rem;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
}

.site-footer {
    border-top: 1px solid var(--border);
    padding-block: 1.5rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.hero,
.auth-card,
.account,
.error-page {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.lead {
    font-size: 1.125rem;
    color: var(--muted);
}

.button {
    display: inline-block;
    padding: 0.65rem 1rem;
    border: none;
    border-radius: var(--radius);
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    cursor: pointer;
    font: inherit;
}

.button:hover {
    background: var(--accent-hover);
    color: #fff;
}

.button-secondary {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--border);
}

.button-secondary:hover {
    background: var(--bg);
    color: var(--accent-hover);
}

.form {
    display: grid;
    gap: 0.75rem;
    max-width: 24rem;
}

.form label {
    font-weight: 600;
}

.form input {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font: inherit;
}

.form-footer {
    margin-top: 1rem;
    color: var(--muted);
}

.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.alert-error {
    background: var(--error-bg);
    color: var(--error-text);
}

.alert-success {
    background: var(--success-bg);
    color: var(--success-text);
}

.account-details {
    display: grid;
    grid-template-columns: 8rem 1fr;
    gap: 0.5rem 1rem;
    margin-bottom: 1.5rem;
}

.account-details dt {
    color: var(--muted);
}