:root {
    --bg: #0f1117;
    --bg-card: #1a1d27;
    --bg-hover: #242836;
    --text: #e4e4e7;
    --text-muted: #9ca3af;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --border: #2a2d3a;
    --radius: 12px;
    --nav-bg: #161821;
}

[data-theme="light"] {
    --bg: #f5f5f7;
    --bg-card: #ffffff;
    --bg-hover: #f0f0f2;
    --text: #1a1a2e;
    --text-muted: #6b7280;
    --accent: #4f46e5;
    --accent-hover: #6366f1;
    --border: #e2e2e8;
    --nav-bg: #ffffff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 16px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    font-size: 1.15rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text);
    white-space: nowrap;
}

.logo span { color: var(--accent); }

.nav-links {
    display: flex;
    gap: 4px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 8px;
    transition: all 0.15s;
}

.nav-link:hover { color: var(--text); background: var(--bg-hover); }
.nav-link.active { color: var(--accent); background: var(--accent)15; }

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
    flex-shrink: 0;
}

.theme-toggle:hover { background: var(--bg-hover); }

.theme-icon-dark { display: none; }
[data-theme="light"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: inline; }

/* Container */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px 16px;
}

.page { display: block; }
.page.hidden { display: none; }

/* Header */
header {
    text-align: center;
    padding: 24px 0 20px;
}

header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

header p {
    color: var(--text-muted);
    margin-top: 4px;
    font-size: 0.9rem;
}

/* Month navigation */
.month-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
}

.month-nav button {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}

.month-nav button:hover { background: var(--bg-hover); }

.month-nav .current-month {
    font-size: 1.15rem;
    font-weight: 600;
    min-width: 180px;
    text-align: center;
}

/* Toolbar */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    gap: 12px;
    flex-wrap: wrap;
}

.activity-filters {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.view-toggle {
    display: flex;
    gap: 4px;
}

.view-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.view-btn:hover { border-color: var(--text-muted); }
.view-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* Chips (club & activity filters) */
.club-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 20px;
}

.chip {
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-muted);
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.15s;
}

.chip:hover { border-color: var(--text-muted); }
.chip.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

/* Day groups (list view) */
.day-group { margin-bottom: 24px; }

.day-header {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 10px;
    padding-left: 4px;
}

/* Event cards */
.event-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-bottom: 10px;
    border-left: 4px solid var(--accent);
    transition: background 0.15s;
}

.event-card:hover { background: var(--bg-hover); }

.event-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 4px;
}

.event-title { font-size: 1rem; font-weight: 600; }
.event-time {
    font-size: 0.88rem;
    color: var(--accent);
    font-weight: 600;
    white-space: nowrap;
    margin-left: 12px;
}

.event-club {
    font-size: 0.78rem;
    font-weight: 500;
    margin-bottom: 6px;
    display: inline-block;
    padding: 2px 8px;
    border-radius: 6px;
}

.event-meta {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.event-description {
    margin-top: 6px;
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.45;
}

.event-links {
    margin-top: 6px;
    display: flex;
    gap: 12px;
    align-items: center;
}

.event-links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.82rem;
}

.event-links a:hover { text-decoration: underline; }

.btn-ics {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 2px 8px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.78rem;
    transition: all 0.15s;
}

.btn-ics:hover { border-color: var(--accent); color: var(--accent); }

/* Calendar grid view */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    margin-bottom: 24px;
}

.cal-header {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    padding: 8px 0;
}

.cal-day {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    min-height: 90px;
    padding: 6px;
    font-size: 0.75rem;
    transition: background 0.15s;
}

.cal-day:hover { background: var(--bg-hover); }
.cal-day.empty { background: transparent; border-color: transparent; }
.cal-day.today { border-color: var(--accent); }

.cal-day-num {
    font-weight: 600;
    font-size: 0.8rem;
    margin-bottom: 4px;
    color: var(--text-muted);
}

.cal-day.today .cal-day-num { color: var(--accent); }

.cal-event {
    padding: 2px 4px;
    border-radius: 4px;
    font-size: 0.68rem;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: #fff;
    cursor: default;
}

/* ICS subscribe */
.ics-subscribe {
    text-align: center;
    margin: 24px 0 8px;
}

.btn-subscribe {
    display: inline-block;
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.15s;
}

.btn-subscribe:hover { border-color: var(--accent); color: var(--accent); }

/* Clubs page */
.clubs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.club-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    border-top: 4px solid var(--accent);
    transition: background 0.15s;
}

.club-card:hover { background: var(--bg-hover); }

.club-card h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.club-type {
    font-size: 0.78rem;
    font-weight: 500;
    display: inline-block;
    padding: 2px 8px;
    border-radius: 6px;
    margin-bottom: 8px;
}

.club-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.45;
    margin-bottom: 12px;
}

.club-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.club-footer a {
    color: var(--accent);
    text-decoration: none;
}

.club-footer a:hover { text-decoration: underline; }

/* Activity / Stats page */
.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
}

.stat-num {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.stats-section {
    margin-bottom: 28px;
}

.stats-section h2 {
    font-size: 1.1rem;
    margin-bottom: 14px;
}

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.bar-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.bar-label {
    font-size: 0.85rem;
    min-width: 140px;
    text-align: right;
    color: var(--text-muted);
}

.bar-fill {
    height: 24px;
    border-radius: 6px;
    min-width: 4px;
    transition: width 0.4s ease;
}

.bar-count {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    min-width: 24px;
}

/* Contacts page */
.contacts-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    max-width: 640px;
    margin: 0 auto;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.about-card h2 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.about-card p {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 8px;
}

.btn-contact {
    display: inline-block;
    padding: 10px 20px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    margin-top: 4px;
    transition: background 0.15s;
}

.btn-contact:hover { background: var(--accent-hover); }

.ics-url {
    display: block;
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 0.82rem;
    word-break: break-all;
    color: var(--accent);
    margin-top: 4px;
}

/* Empty / Loading */
.empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty .icon { font-size: 2.5rem; margin-bottom: 12px; }

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Footer */
footer {
    text-align: center;
    padding: 28px 0;
    color: var(--text-muted);
    font-size: 0.78rem;
    border-top: 1px solid var(--border);
    margin-top: 32px;
}

/* Mobile */
@media (max-width: 640px) {
    .nav-links { gap: 0; }
    .nav-link { padding: 6px 8px; font-size: 0.82rem; }
    header h1 { font-size: 1.3rem; }
    .event-top { flex-direction: column; }
    .event-time { margin-left: 0; margin-top: 2px; }
    .cal-day { min-height: 70px; padding: 4px; }
    .cal-event { font-size: 0.6rem; }
    .bar-label { min-width: 80px; font-size: 0.78rem; }
    .clubs-grid { grid-template-columns: 1fr; }
    .stats-cards { grid-template-columns: repeat(2, 1fr); }
}