:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --border-color: #30363d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --cyan: #00e5ff;
    --neon-green: #39ff14;
    --checked-dark: #0a2e1f;
    --cell-bg: #1c2128;
    --cell-hover: #252b33;
    --danger: #f85149;
}

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

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

/* ---------- Login ---------- */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    background: var(--bg-secondary);
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-align: center;
}
.login-container h1 { color: var(--cyan); margin-bottom: 1rem; }
.login-container label { display: block; margin-bottom: 0.5rem; color: var(--text-secondary); }
.login-container input {
    width: 100%; padding: 0.5rem; background: var(--bg-primary);
    border: 1px solid var(--border-color); border-radius: 4px;
    color: var(--text-primary); margin-bottom: 1rem;
}
.login-container button {
    background: var(--cyan); color: #000; border: none;
    padding: 0.6rem 1.5rem; border-radius: 4px; font-weight: bold; cursor: pointer;
}
.error { color: var(--danger); margin-top: 0.5rem; }

.flash {
    padding: 0.8rem;
    margin: 0.5rem 0;
    border-radius: 4px;
    text-align: center;
}
.flash.info {
    background: var(--cyan);
    color: #000;
}

/* ---------- Layout ---------- */
.main-layout {
    display: flex;
    min-height: 100vh;
}
.sidebar {
    width: 220px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 1rem;
    transition: transform 0.3s;
    overflow-y: auto;
}
.sidebar.hidden {
    transform: translateX(-100%);
    position: absolute;
    z-index: 10;
    height: 100%;
}
.content {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
}
.header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.header a, .header button {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--cyan);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
}
.header h1 { color: var(--neon-green); font-size: 1.5rem; }

/* ---------- Bingo Grid ---------- */
.grid-section {
    margin-bottom: 2rem;
}
.grid-section h2 {
    color: var(--cyan);
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3rem;
}
.bingo-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
}
.bingo-cell {
    position: relative;
    background: var(--cell-bg);
    padding: 8px 4px;
    text-align: center;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s;
    word-break: break-word;
    font-size: 0.85rem;
    line-height: 1.2;
    border: 1px solid transparent;
}
.bingo-cell:hover {
    background: var(--cell-hover);
    border-color: var(--cyan);
}
.bingo-cell.checked {
    background: var(--checked-dark);
    border-color: var(--neon-green);
    color: var(--neon-green);
}
.bingo-cell .checkmark {
    display: none;
    position: absolute;
    top: 2px;
    right: 4px;
    font-size: 1.2rem;
    color: var(--neon-green);
}
.bingo-cell.checked .checkmark {
    display: block;
}

/* ---------- Bingo Alert ---------- */
.bingo-alert {
    background: var(--neon-green);
    color: #000;
    padding: 0.8rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-weight: bold;
    display: none;
    text-align: center;
}

/* ---------- Sidebar Progress ---------- */
#progress-list {
    list-style: none;
    margin-top: 1rem;
}
#progress-list li {
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}
.progress-bar {
    height: 6px;
    background: var(--bg-primary);
    margin-top: 2px;
    border-radius: 3px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--cyan);
    border-radius: 3px;
}

/* ---------- Admin Modal ---------- */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0; top: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.7);
}
.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    margin: 5% auto;
    padding: 1.5rem;
    width: 90%;
    max-width: 600px;
    border-radius: 8px;
    color: var(--text-primary);
}
.close {
    color: var(--text-secondary);
    float: right;
    font-size: 1.5rem;
    cursor: pointer;
}
.close:hover { color: var(--danger); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .sidebar { width: 180px; }
    .bingo-cell { font-size: 0.75rem; padding: 6px 3px; }
}

/* ---------- Bingo dots ---------- */
.bingo-dot {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-left: 4px;
    vertical-align: middle;
}
.dot-bingo {
    background: var(--neon-green);
    box-shadow: 0 0 4px var(--neon-green);
}
.dot-no-bingo {
    background: var(--danger);
    box-shadow: 0 0 4px var(--danger);
}

/* ---------- Event list ---------- */
.event-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.2rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
}
.event-item .inactive {
    text-decoration: line-through;
    color: var(--text-secondary);
}
.delete-event-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--danger);
    font-size: 1rem;
}
#add-event-section input,
#add-event-section select {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

/* ---------- Collapsible sections ---------- */
.collapsible-section {
    margin-top: 0.8rem;
}
.collapsible-header {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-color);
    user-select: none;
    color: var(--text-primary);
}
.collapsible-header:hover {
    color: var(--cyan);
}
.collapsible-header h4 {
    margin: 0;
    font-size: 0.95rem;
}
.toggle-icon {
    margin-right: 6px;
    font-size: 0.8rem;
    transition: transform 0.2s;
    width: 14px;
    text-align: center;
}
.collapsible-header.open .toggle-icon {
    transform: rotate(90deg);
}
.collapsible-body {
    display: none;
    padding-left: 8px;
    margin-top: 0.3rem;
}
.collapsible-body.open {
    display: block;
}

/* ---------- Event sub-list ---------- */
.events-sublist {
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 0.5rem;
}
.add-event-form {
    display: flex;
    gap: 4px;
}
.add-event-input {
    flex: 1;
    padding: 0.3rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}
.add-event-btn {
    background: var(--cyan);
    color: #000;
    border: none;
    padding: 0.3rem 0.6rem;
    cursor: pointer;
    font-weight: bold;
}
/* Adjust existing event items for sublists */
.event-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.15rem 0;
    font-size: 0.8rem;
    border-bottom: 1px solid var(--border-color);
}
.delete-event-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--danger);
    font-size: 0.9rem;
}
.inactive {
    text-decoration: line-through;
    color: var(--text-secondary);
}