/* ================================================================
   CALENDAR PRO — Design System
   Typography : Plus Jakarta Sans (Google Fonts via @import)
   Palette    : Zinc-900 sidebar + Amber accent + Warm off-white
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&display=swap');

/* ================================================================
   CSS CUSTOM PROPERTIES
   ================================================================ */
:root {
    /* Brand & Primary — Amber */
    --primary-color:  #d97706;
    --primary-hover:  #b45309;
    --primary-light:  #fef3c7;
    --primary-muted:  rgba(217, 119, 6, 0.10);

    /* Sidebar (dark panel) */
    --sidebar-bg:          #18181b;
    --sidebar-border:      rgba(255, 255, 255, 0.07);
    --sidebar-text:        #a1a1aa;
    --sidebar-text-hover:  #e4e4e7;
    --sidebar-active-bg:   rgba(217, 119, 6, 0.14);
    --sidebar-active-text: #f59e0b;
    --sidebar-width:       260px;

    /* Status */
    --success-color: #16a34a;
    --warning-color: #d97706;
    --danger-color:  #dc2626;
    --info-color:    #2563eb;

    /* Surfaces */
    --background:   #f6f6f3;
    --surface:      #ffffff;
    --surface-alt:  #fafaf8;

    /* Text */
    --text-primary:   #18181b;
    --text-secondary: #52525b;
    --text-tertiary:  #a1a1aa;

    /* Borders */
    --border-color: #e4e4e7;
    --border-light: #f0f0f3;

    /* Slot status backgrounds */
    --slot-free:      #f0fdf4;
    --slot-booked:    #fff7ed;
    --slot-cancelled: #fef2f2;
    --slot-blocked:   #f9f9f9;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.07), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 8px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 20px -4px rgba(0, 0, 0, 0.10), 0 4px 8px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 24px 40px -8px rgba(0, 0, 0, 0.16), 0 8px 16px -4px rgba(0, 0, 0, 0.06);

    /* Radii */
    --radius-xs:   3px;
    --radius-sm:   6px;
    --radius-md:   9px;
    --radius-lg:   13px;
    --radius-xl:   18px;
    --radius-full: 9999px;

    /* Layout */
    --topbar-height: 60px;

    /* Transitions */
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================================================================
   RESET & BASE
   ================================================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont,
        'Segoe UI', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

button { font-family: inherit; font-size: inherit; }
input, select, textarea { font-family: inherit; }

/* ================================================================
   LAYOUT
   ================================================================ */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* ================================================================
   SIDEBAR
   ================================================================ */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 200;
    transition: transform var(--transition);
    overflow: hidden;
}

/* Ambient glow */
.sidebar::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 0%,   rgba(217, 119, 6, 0.07) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 100%, rgba(217, 119, 6, 0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}
.sidebar > * { position: relative; z-index: 1; }

.sidebar.collapsed { transform: translateX(-100%); }

/* ---- Sidebar Header ---- */
.sidebar-header {
    padding: 20px 20px 16px;
    border-bottom: 1px solid var(--sidebar-border);
    position: relative;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 11px;
}

.sidebar-brand-mark {
    width: 34px;
    height: 34px;
    background: var(--primary-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(217, 119, 6, 0.35);
}

.sidebar-header h1 {
    font-size: 1rem;
    font-weight: 800;
    color: #f4f4f5;
    letter-spacing: -0.03em;
}

.sidebar-header p {
    font-size: 0.6875rem;
    color: var(--sidebar-text);
    margin-top: 1px;
    letter-spacing: 0.025em;
}

.sidebar-close-btn {
    position: absolute;
    top: 17px;
    right: 16px;
    background: none;
    border: none;
    color: var(--sidebar-text);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}
.sidebar-close-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--sidebar-text-hover);
}

/* ---- Sidebar Nav ---- */
.sidebar-nav {
    flex: 1;
    padding: 14px 10px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
}

.nav-section-label {
    font-size: 0.5625rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #52525b;
    padding: 8px 12px 4px;
    margin-top: 4px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 10px 12px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--sidebar-text);
    transition: all var(--transition);
    text-align: left;
    width: 100%;
    letter-spacing: 0.005em;
}
.nav-btn:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--sidebar-text-hover);
}
.nav-btn.active {
    background: var(--sidebar-active-bg);
    color: var(--sidebar-active-text);
    font-weight: 700;
}

.nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.9;
}

/* ---- Sidebar Footer ---- */
.sidebar-footer {
    padding: 14px 10px;
    border-top: 1px solid var(--sidebar-border);
}

/* ---- Sidebar Overlay (mobile) ---- */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 150;
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
}
.sidebar-overlay.active { display: block; }

/* ================================================================
   TOPBAR
   ================================================================ */
.topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 24px;
    height: var(--topbar-height);
    border-bottom: 1px solid var(--border-color);
    background: var(--surface);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-xs);
}

.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border: 1px solid var(--border-color);
    background: transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
    flex-shrink: 0;
}
.sidebar-toggle:hover {
    background: var(--background);
    border-color: #c0c0c8;
    color: var(--text-primary);
}

.topbar-title {
    font-size: 0.9375rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    flex: 1;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: auto;
}

.topbar-user-name {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* SSE Dot */
.sse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    margin-left: auto;
    transition: background-color 0.4s ease, box-shadow 0.4s ease;
}
.sse-dot--connected {
    background: #22c55e;
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.18);
    animation: sse-pulse 2.5s ease-in-out infinite;
}
.sse-dot--disconnected {
    background: var(--border-color);
}
@keyframes sse-pulse {
    0%, 100% { box-shadow: 0 0 0 0   rgba(34, 197, 94, 0.35); }
    50%       { box-shadow: 0 0 0 5px rgba(34, 197, 94, 0); }
}

/* ================================================================
   MAIN CONTENT
   ================================================================ */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left var(--transition);
    display: flex;
    flex-direction: column;
}
.main-content.expanded { margin-left: 0; }

/* Views */
.view {
    display: none;
    padding: 24px;
    flex: 1;
}
.view.active {
    display: flex;
    flex-direction: column;
}

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.view-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

/* ================================================================
   VIEW MODE SWITCHER (Day / Week / Month)
   ================================================================ */
.view-mode-switcher {
    display: inline-flex;
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 3px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xs);
}

.view-mode-btn {
    padding: 6px 16px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}
.view-mode-btn:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
}
.view-mode-btn.active {
    background: var(--primary-color);
    color: white;
    font-weight: 700;
    box-shadow: 0 1px 4px rgba(217, 119, 6, 0.30);
}

.period-label {
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--text-primary);
    min-width: 180px;
    text-align: center;
    letter-spacing: -0.01em;
}

/* ================================================================
   BUTTONS
   ================================================================ */
.btn {
    padding: 8px 14px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    -webkit-user-select: none;
    user-select: none;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 1px 3px rgba(217, 119, 6, 0.25);
}
.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 3px 10px rgba(217, 119, 6, 0.30);
    transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); box-shadow: none; }

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
    background: var(--background);
    border-color: #c0c0c8;
    box-shadow: var(--shadow-sm);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
    box-shadow: 0 1px 3px rgba(220, 38, 38, 0.25);
}
.btn-danger:hover {
    background: #b91c1c;
    box-shadow: 0 3px 10px rgba(220, 38, 38, 0.30);
    transform: translateY(-1px);
}
.btn-danger:active { transform: translateY(0); }

.btn-success {
    background: var(--success-color);
    color: white;
    box-shadow: 0 1px 3px rgba(22, 163, 74, 0.25);
}
.btn-success:hover {
    background: #15803d;
    box-shadow: 0 3px 10px rgba(22, 163, 74, 0.30);
    transform: translateY(-1px);
}
.btn-success:active { transform: translateY(0); }

.btn-warning {
    background: var(--warning-color);
    color: white;
    box-shadow: 0 1px 3px rgba(217, 119, 6, 0.25);
}
.btn-warning:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}
.btn-warning:active { transform: translateY(0); }

.btn-today {
    background: var(--surface);
    color: var(--primary-color);
    border: 1.5px solid var(--primary-color);
    font-weight: 700;
    font-size: 0.8125rem;
    padding: 6px 14px;
}
.btn-today:hover { background: var(--primary-light); }

.btn-sm {
    padding: 5px 10px;
    font-size: 0.75rem;
    border-radius: var(--radius-xs);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-icon { padding: 7px 9px; }

/* ================================================================
   INPUTS & FORMS
   ================================================================ */
.search-input,
.filter-select,
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="time"],
input[type="datetime-local"],
input[type="number"],
select,
textarea {
    padding: 8px 12px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    background: var(--surface);
    color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
    -webkit-appearance: none;
    appearance: none;
    font-weight: 500;
}

select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a1a1aa' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 32px;
}

.search-input:focus,
.filter-select:focus,
input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.12);
}

textarea {
    resize: vertical;
    min-height: 80px;
    line-height: 1.6;
}

.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

.form-group input,
.form-group select,
.form-group textarea { width: 100%; }

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

/* ================================================================
   TABLES
   ================================================================ */
.table-container {
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.data-table th {
    background: var(--surface-alt);
    font-weight: 700;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    font-size: 0.875rem;
    color: var(--text-primary);
}

.data-table tbody tr:hover { background: var(--surface-alt); }
.data-table tbody tr:last-child td { border-bottom: none; }

/* Status Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 9px;
    border-radius: var(--radius-full);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.badge-success  { background: #dcfce7; color: #15803d; }
.badge-warning  { background: #fef3c7; color: #b45309; }
.badge-danger   { background: #fee2e2; color: #991b1b; }
.badge-secondary{ background: #f4f4f5; color: #52525b; }
.badge-primary  { background: #fef3c7; color: #b45309; }

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4px;
    padding: 16px;
}

.pagination button {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    background: var(--surface);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
    min-width: 36px;
    text-align: center;
    font-family: inherit;
}
.pagination button:hover {
    background: var(--background);
    border-color: #c0c0c8;
    color: var(--text-primary);
}
.pagination button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    font-weight: 700;
    box-shadow: 0 2px 6px rgba(217, 119, 6, 0.28);
}

/* ================================================================
   CALENDAR — WEEK & DAY VIEW
   ================================================================ */
.calendar-container {
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    flex: 1;
}

.calendar-grid {
    display: grid;
    grid-template-columns: 64px repeat(7, 1fr);
    min-height: calc(100vh - 220px);
}

.calendar-grid.day-mode {
    grid-template-columns: 64px 1fr;
}

.calendar-header {
    background: var(--surface-alt);
    padding: 12px 8px 10px;
    text-align: center;
    font-weight: 600;
    font-size: 0.8125rem;
    border-bottom: 1.5px solid var(--border-color);
    border-right: 1px solid var(--border-light);
    color: var(--text-secondary);
}
.calendar-header:last-child { border-right: none; }

.calendar-header .day-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    margin-top: 3px;
    font-size: 0.9375rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.calendar-header.is-today {
    background: var(--primary-muted);
}
.calendar-header.is-today .day-number {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 8px rgba(217, 119, 6, 0.35);
}

.calendar-header small {
    display: block;
    font-weight: 700;
    color: var(--text-tertiary);
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.time-column {
    background: var(--surface-alt);
    border-right: 1.5px solid var(--border-color);
}

.time-slot-label {
    height: 60px;
    padding: 4px 8px;
    font-size: 0.625rem;
    font-weight: 700;
    color: var(--text-tertiary);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: flex-start;
    justify-content: flex-end;
    letter-spacing: 0.05em;
}

.day-column {
    border-right: 1px solid var(--border-light);
    position: relative;
}
.day-column:last-child { border-right: none; }

.calendar-hour-row {
    height: 60px;
    border-bottom: 1px solid var(--border-light);
    position: relative;
    cursor: pointer;
    transition: background var(--transition);
}
.calendar-hour-row:hover {
    background: rgba(217, 119, 6, 0.03);
}

/* Slot Chips */
.calendar-slot {
    position: absolute;
    top: 3px;
    left: 4px;
    right: 4px;
    bottom: 3px;
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-size: 0.6875rem;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.15s ease;
    z-index: 1;
    border-left-width: 3px;
    border-left-style: solid;
    border-top: none;
    border-right: none;
    border-bottom: none;
}
.calendar-slot:hover {
    transform: translateY(-1px) scale(1.015);
    box-shadow: var(--shadow-md);
    z-index: 2;
}

.slot-free      { background: var(--slot-free);      border-left-color: var(--success-color); }
.slot-booked    { background: var(--slot-booked);    border-left-color: var(--primary-color); }
.slot-cancelled { background: var(--slot-cancelled); border-left-color: var(--danger-color); }
.slot-blocked   { background: var(--slot-blocked);   border-left-color: var(--text-tertiary); opacity: 0.7; }

.slot-time {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.6875rem;
    letter-spacing: 0.01em;
}

.slot-student {
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.6875rem;
    font-weight: 500;
    margin-top: 1px;
}

.slot-status {
    font-size: 0.5625rem;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    opacity: 0.6;
    font-weight: 700;
    margin-top: 1px;
}

/* ================================================================
   CALENDAR — MONTH VIEW
   ================================================================ */
.month-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    min-height: calc(100vh - 220px);
}

.month-day-header {
    background: var(--surface-alt);
    padding: 10px 8px;
    text-align: center;
    font-weight: 700;
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    border-bottom: 1.5px solid var(--border-color);
    border-right: 1px solid var(--border-light);
}
.month-day-header:last-child { border-right: none; }

.month-cell {
    border-right: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
    padding: 8px;
    min-height: 100px;
    cursor: pointer;
    transition: background var(--transition);
    position: relative;
}
.month-cell:nth-child(7n) { border-right: none; }
.month-cell:hover { background: var(--primary-muted); }

.month-cell.other-month {
    background: rgba(0, 0, 0, 0.015);
    opacity: 0.6;
}

.month-cell.is-today { background: rgba(217, 119, 6, 0.04); }

.month-cell-date {
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.month-cell.is-today .month-cell-date {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 6px rgba(217, 119, 6, 0.35);
}

.month-cell.other-month .month-cell-date {
    color: var(--text-tertiary);
    font-weight: 500;
}

.month-slot-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin: 1px;
}

.month-slot-dot.dot-free      { background: var(--success-color); }
.month-slot-dot.dot-booked    { background: var(--primary-color); }
.month-slot-dot.dot-cancelled { background: var(--danger-color); }
.month-slot-dot.dot-blocked   { background: var(--text-tertiary); }

.month-slot-summary {
    font-size: 0.6875rem;
    color: var(--text-secondary);
    margin-top: 4px;
    font-weight: 500;
}

.month-slot-count {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 4px;
}

.month-slot-count span {
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

/* ================================================================
   MODAL
   ================================================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}
.modal-overlay.active { display: flex; }

.modal {
    background: var(--surface);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 520px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(0, 0, 0, 0.06);
    animation: modalIn 0.22s cubic-bezier(0.34, 1.35, 0.64, 1);
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.94) translateY(10px); }
    to   { opacity: 1; transform: scale(1)    translateY(0); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px;
    border-bottom: 1px solid var(--border-color);
    background: var(--surface-alt);
}

.modal-header h3 {
    font-size: 1rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.375rem;
    cursor: pointer;
    color: var(--text-tertiary);
    line-height: 1;
    padding: 4px 7px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-close:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.modal-body {
    padding: 22px;
    overflow-y: auto;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid var(--border-color);
}

/* ================================================================
   TOAST
   ================================================================ */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 13px 16px;
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: toastIn 0.3s cubic-bezier(0.34, 1.3, 0.64, 1);
    min-width: 280px;
    max-width: 380px;
    font-size: 0.875rem;
    font-weight: 500;
    pointer-events: all;
}

.toast.success  { border-left: 4px solid var(--success-color); }
.toast.error    { border-left: 4px solid var(--danger-color); }
.toast.warning  { border-left: 4px solid var(--warning-color); }

@keyframes toastIn {
    from { transform: translateX(110%); opacity: 0; }
    to   { transform: translateX(0);   opacity: 1; }
}

/* ================================================================
   SLOT DETAILS IN MODAL
   ================================================================ */
.slot-detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 11px 0;
    border-bottom: 1px solid var(--border-light);
}
.slot-detail-row:last-child { border-bottom: none; }

.slot-detail-label {
    color: var(--text-tertiary);
    font-size: 0.8125rem;
    font-weight: 500;
}

.slot-detail-value {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.slot-actions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-top: 18px;
}

/* ================================================================
   LOADING & EMPTY STATES
   ================================================================ */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 48px;
    color: var(--text-secondary);
    gap: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2.5px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
    flex-shrink: 0;
}

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

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-tertiary);
}

.empty-state-icon {
    font-size: 2.25rem;
    margin-bottom: 12px;
    opacity: 0.4;
}

/* ================================================================
   EVENT HISTORY
   ================================================================ */
.event-history {
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px solid var(--border-color);
}

.event-history h4 {
    font-size: 0.6875rem;
    color: var(--text-tertiary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
}

.event-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--surface-alt);
    border-radius: var(--radius-sm);
    margin-bottom: 4px;
    font-size: 0.75rem;
    border: 1px solid var(--border-light);
}

.event-type {
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.event-time { color: var(--text-tertiary); font-weight: 500; }

/* ================================================================
   CHECKBOX / DAYS
   ================================================================ */
.days-checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.day-checkbox {
    display: flex;
    align-items: center;
    gap: 6px;
}

.day-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.day-checkbox label {
    font-size: 0.875rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-secondary);
}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .main-content.expanded { margin-left: 0; }
}

@media (max-width: 768px) {
    .view { padding: 16px; }
    .topbar { padding: 0 16px; }

    .view-header {
        flex-direction: column;
        align-items: stretch;
    }

    .view-mode-switcher { align-self: center; }
    .view-actions { justify-content: center; }

    .calendar-grid {
        grid-template-columns: 48px repeat(7, 1fr);
        font-size: 0.75rem;
    }
    .calendar-grid.day-mode { grid-template-columns: 48px 1fr; }

    .period-label {
        min-width: auto;
        font-size: 0.875rem;
    }

    .form-row { grid-template-columns: 1fr; }
    .month-cell { min-height: 70px; padding: 4px; }
    .slot-actions-grid { grid-template-columns: 1fr; }
}