/* ── Reset & Base ────────────────────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg: #fafafa;
    --surface: #ffffff;
    --border: #e0e0e0;
    --border-light: #f0f0f0;
    --text: #111111;
    --text-secondary: #666666;
    --text-muted: #999999;
    --accent: #111111;
    --accent-hover: #333333;
    --approved: #2d8a4e;
    --approved-bg: #f0f7f2;
    --pending: #888888;
    --pending-bg: #fafafa;
    --rejected: #cccccc;
    --danger: #333333;
    --success: #111111;
    --radius: 8px;
    --radius-sm: 4px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --transition: 0.15s ease;
}

html { font-size: 14px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ── Layout ──────────────────────────────────────────────────────────────────── */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ── Header / Nav ────────────────────────────────────────────────────────────── */
.navbar {
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.navbar-brand {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.navbar-brand svg { opacity: 0.9; }

.navbar-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.nav-link:hover {
    background: var(--border-light);
    color: var(--text);
}

.nav-link.active {
    background: var(--text);
    color: white;
}

/* ── Page Header ─────────────────────────────────────────────────────────────── */
.page-header {
    padding: 28px 0 20px;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 4px;
}

/* ── Calendar ────────────────────────────────────────────────────────────────── */
.calendar-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.calendar-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.cal-nav-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    color: var(--text);
}

.cal-nav-btn:hover {
    background: var(--text);
    color: white;
    border-color: var(--text);
}

.cal-nav-label {
    font-weight: 600;
    font-size: 1rem;
    min-width: 200px;
    text-align: center;
}

.room-tabs {
    display: flex;
    gap: 4px;
    background: var(--border-light);
    padding: 3px;
    border-radius: var(--radius);
}

.room-tab {
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    transition: all var(--transition);
    white-space: nowrap;
}

.room-tab:hover { color: var(--text); }

.room-tab.active {
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow);
}

/* ── Calendar Grid ───────────────────────────────────────────────────────────── */
.calendar-grid-wrapper {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.calendar-grid {
    display: grid;
    grid-template-columns: 60px repeat(7, 1fr);
    min-width: 700px;
}

.cal-header-cell {
    padding: 12px 8px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.cal-header-cell.time-col {
    border-right: 1px solid var(--border);
}

.cal-day-name {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.cal-day-num {
    font-size: 1.1rem;
    font-weight: 700;
    margin-top: 2px;
}

.cal-header-cell.today .cal-day-num {
    background: var(--text);
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.cal-time-cell {
    padding: 0 8px;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: flex-start;
    justify-content: flex-end;
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
    height: 52px;
    padding-top: 4px;
}

.cal-cell {
    border-bottom: 1px solid var(--border-light);
    border-right: 1px solid var(--border-light);
    height: 52px;
    position: relative;
    cursor: pointer;
    transition: background var(--transition);
}

.cal-cell:hover { background: var(--border-light); }
.cal-cell:last-child { border-right: none; }

.cal-cell.occupied {
    cursor: default;
    pointer-events: none;
}

.cal-event {
    position: absolute;
    inset: 2px;
    border-radius: var(--radius-sm);
    padding: 4px 6px;
    font-size: 0.7rem;
    font-weight: 500;
    overflow: hidden;
    z-index: 2;
    line-height: 1.3;
}

.cal-event-span {
    z-index: 10;
    overflow: hidden;
    border-radius: var(--radius);
    padding: 8px 10px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.cal-event.approved {
    background: var(--approved-bg);
    border-left: 3px solid var(--approved);
    color: var(--text);
}

.cal-event.pending {
    background: var(--pending-bg);
    border-left: 3px solid var(--pending);
    border-style: dashed;
    border-left-style: solid;
    color: var(--text-secondary);
}

.cal-event-status {
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 1px 6px;
    border-radius: 3px;
    width: fit-content;
    margin-bottom: 2px;
}

.cal-event-status.approved-label {
    background: rgba(45, 138, 78, 0.12);
    color: #2d8a4e;
}

.cal-event-status.pending-label {
    background: rgba(136, 136, 136, 0.15);
    color: #666666;
}

.cal-event-name { font-weight: 600; font-size: 0.8rem; }
.cal-event-time { opacity: 0.7; font-size: 0.7rem; }
.cal-event-desc {
    opacity: 0.55;
    font-size: 0.65rem;
    margin-top: 2px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.cal-cell.past { background: var(--border-light); opacity: 0.5; }

/* ── Legend ───────────────────────────────────────────────────────────────────── */
.calendar-legend {
    display: flex;
    gap: 20px;
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    background: var(--bg);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 2px;
}

.legend-dot.approved {
    background: var(--approved-bg);
    border-left: 2px solid var(--approved);
}

.legend-dot.pending {
    background: var(--pending-bg);
    border: 1px dashed var(--pending);
}

/* ── Buttons ─────────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--text);
    color: white;
    border-color: var(--text);
}

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

.btn-outline {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
}

.btn-outline:hover {
    background: var(--border-light);
}

.btn-sm {
    padding: 4px 12px;
    font-size: 0.8rem;
    border-radius: 6px;
}

.btn-approve {
    background: var(--text);
    color: white;
}

.btn-approve:hover { opacity: 0.85; }

.btn-reject {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-reject:hover { background: var(--border-light); }

.btn-delete {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    font-size: 0.75rem;
}

.btn-delete:hover { color: var(--text); border-color: var(--text); }

/* ── Forms ───────────────────────────────────────────────────────────────────── */
.form-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    max-width: 520px;
    margin: 0 auto;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: inherit;
    background: var(--surface);
    color: var(--text);
    transition: border-color var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--text);
    box-shadow: 0 0 0 3px rgba(0,0,0,0.06);
}

.form-textarea { resize: vertical; min-height: 80px; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-error {
    background: var(--border-light);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.form-success {
    background: var(--border-light);
    border: 1px solid var(--text);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 20px;
    font-size: 0.85rem;
}

/* ── Login ───────────────────────────────────────────────────────────────────── */
.login-wrapper {
    min-height: calc(100vh - 56px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.login-card {
    width: 100%;
    max-width: 380px;
}

.login-card .form-card {
    max-width: none;
}

.login-title {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
}

.login-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 28px;
}

/* ── Admin Table ─────────────────────────────────────────────────────────────── */
.admin-filters {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    background: var(--border-light);
    padding: 3px;
    border-radius: var(--radius);
    width: fit-content;
}

.filter-btn {
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.filter-btn:hover { color: var(--text); }

.filter-btn.active {
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow);
}

.reservations-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.reservation-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    transition: all var(--transition);
}

.reservation-card:hover {
    box-shadow: var(--shadow-md);
}

.res-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-top: 6px;
    flex-shrink: 0;
}

.res-status-dot.pending { background: var(--pending); }
.res-status-dot.approved { background: var(--approved); }
.res-status-dot.rejected { background: var(--rejected); }

.res-info { flex: 1; min-width: 0; }

.res-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.res-room {
    font-weight: 600;
    font-size: 0.9rem;
}

.res-badge {
    font-size: 0.65rem;
    padding: 2px 8px;
    border-radius: 99px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.res-badge.pending {
    background: var(--pending-bg);
    color: var(--pending);
    border: 1px solid var(--border);
}

.res-badge.approved {
    background: var(--approved-bg);
    color: var(--approved);
    border: 1px solid #c3dfc9;
}

.res-badge.rejected {
    color: var(--rejected);
    border: 1px solid var(--border);
}

.res-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.res-desc {
    font-size: 0.85rem;
    color: var(--text);
    background: var(--bg);
    padding: 8px 12px;
    border-radius: 6px;
    margin-top: 8px;
    border-left: 2px solid var(--border);
}

.res-by {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.res-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
    align-items: flex-start;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    opacity: 0.4;
}

/* ── Responsive ──────────────────────────────────────────────────────────────── */
.calendar-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 768px) {
    .calendar-controls { flex-direction: column; align-items: stretch; }
    .room-tabs { justify-content: center; }
    .form-row { grid-template-columns: 1fr; }
    .reservation-card { flex-direction: column; }
    .res-actions { width: 100%; justify-content: flex-end; }
    .navbar-inner { padding: 0 16px; }
    .app-container { padding: 0 16px; }
}

/* ── Tooltip ─────────────────────────────────────────────────────────────────── */
.tooltip-wrapper {
    position: relative;
}

.tooltip {
    display: none;
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    white-space: nowrap;
    z-index: 50;
    box-shadow: var(--shadow-md);
}

.cal-cell:hover .tooltip { display: block; }

/* ── Duration Selector ───────────────────────────────────────────────────────── */
.duration-options {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.duration-option {
    flex: 1;
    min-width: 60px;
}

.duration-option input { display: none; }

.duration-option label {
    display: block;
    text-align: center;
    padding: 10px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.duration-option label:hover {
    border-color: var(--text);
}

.duration-option input:checked + label {
    background: var(--text);
    color: white;
    border-color: var(--text);
}

.duration-option.disabled label {
    opacity: 0.3;
    cursor: not-allowed;
    text-decoration: line-through;
}

.duration-option.disabled input:checked + label {
    background: var(--surface);
    color: var(--text);
    opacity: 0.3;
}

/* ── Slot Status ─────────────────────────────────────────────────────────────── */
.slot-status {
    font-size: 0.75rem;
    margin-top: 6px;
    min-height: 18px;
}

.slot-status.slot-full {
    color: var(--text-secondary);
    font-weight: 500;
}