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

:root {
    --bg-body:      #191919;
    --bg-sidebar:   #202021;
    --bg-card:      #282828;
    --bg-input:     #373737;
    --bg-hover:     #323237;
    --border:       #39393d;
    --text:         #cccccc;
    --text-muted:   #858585;
    --text-bright:  #e0e0e0;
    --accent:       #0078d4;
    --accent-hover: #1a8ceb;
    --danger:       #f14c4c;
    --danger-hover: #d73a3a;
    --success:      #4ec9b0;
    --warning:      #e7a023;
    --radius:       6px;
    --sidebar-w:    220px;
    /* Main column: default horizontal = Users tab; lessons/reservations override below */
    --main-pad-y:   16px;
    --main-pad-x:   20px;
    --main-pad-x-schedule: 10px; /* Lessons + Reservations only */
    /* Week grid: day header row + time gutter offset (must match) */
    --week-day-header-h: 32px;
    --scrollbar-track:       #202021;
    --scrollbar-thumb:       #36363a;
    --scrollbar-thumb-hover: #444448;
}

html, body {
    height: 100%;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    font-size: 14px;
    color: var(--text);
    background: var(--bg-body);
}

/* ── Scrollbars (dark minimal: Firefox + WebKit) ─────── */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

*::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

*::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

*::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
    border: 2px solid var(--scrollbar-track);
}

*::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

*::-webkit-scrollbar-corner {
    background: var(--scrollbar-track);
}

/* ── Login screen ────────────────────────────────────── */
#login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.login-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 36px;
    width: 360px;
    text-align: center;
}

.login-box h1 {
    font-size: 20px;
    color: var(--text-bright);
    margin-bottom: 6px;
}

.login-box p {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 13px;
}

.login-box input {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-bright);
    font-size: 14px;
    outline: none;
    transition: border-color .15s;
}

.login-box input:focus {
    border-color: var(--accent);
}

.login-box button {
    width: 100%;
    margin-top: 16px;
    padding: 10px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius);
    color: #fff;
    font-size: 14px;
    cursor: pointer;
    transition: background .15s;
}

.login-box button:hover { background: var(--accent-hover); }

.login-code-hint {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 13px;
    line-height: 1.45;
}

.login-code-hint strong {
    color: var(--text-bright);
    font-weight: 600;
}

.login-code-actions {
    margin-top: 14px;
    font-size: 13px;
    color: var(--text-muted);
}

.login-box .btn-link {
    background: none;
    border: none;
    padding: 0;
    margin: 0;
    width: auto;
    font-size: inherit;
    color: var(--accent);
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.login-box .btn-link:hover {
    color: var(--accent-hover);
    background: none;
}

.login-code-sep {
    margin: 0 6px;
    opacity: 0.6;
}

#login-code {
    letter-spacing: 0.25em;
    font-variant-numeric: tabular-nums;
}

.login-error {
    color: var(--danger);
    margin-top: 12px;
    font-size: 13px;
    min-height: 18px;
}

/* ── App shell ───────────────────────────────────────── */
#app-shell { display: none; height: 100vh; }
#app-shell.active {
    display: flex;
    --app-topbar-pad-y: 11px;
    --app-topbar-inner-min-h: 44px;
}

/* Left column: title strip + sidebar (same width as --sidebar-w) */
.app-shell-left {
    display: flex;
    flex-direction: column;
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    flex-shrink: 0;
    min-height: 0;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
}

.app-title-bar {
    flex-shrink: 0;
    box-sizing: border-box;
    width: 100%;
    padding: var(--app-topbar-pad-y) 18px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-sidebar);
    margin: 0;
    font-family: ui-monospace, 'Cascadia Code', 'Cascadia Mono', 'Segoe UI Mono', monospace;
    font-size: 12px;
}

.app-title-bar-inner {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: var(--app-topbar-inner-min-h);
    box-sizing: border-box;
}

.app-title-bar-brand {
    font-weight: 900;
    font-size: 17px;
    letter-spacing: 0.12em;
    color: var(--text-bright);
}

/* Sidebar */
.sidebar {
    flex: 1;
    min-height: 0;
    width: 100%;
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    padding-top: 12px;
    box-sizing: border-box;
}

.sidebar-nav { flex: 1; list-style: none; }

.sidebar-nav li {
    padding: 10px 18px;
    cursor: pointer;
    color: var(--text);
    font-size: 14px;
    transition: background .12s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-nav li:hover { background: var(--bg-hover); }
.sidebar-nav li.active { background: var(--bg-hover); color: var(--accent); }

.sidebar-nav li .sidebar-nav-label {
    flex: 1;
    min-width: 0;
}

.sidebar-footer {
    border-top: 1px solid var(--border);
    padding: 12px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-footer .user-info {
    font-size: 12px;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-footer .user-info strong {
    display: block;
    color: var(--text);
    font-size: 13px;
}

.school-logout {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-muted);
    padding: 5px 10px;
    font-size: 12px;
    cursor: pointer;
    transition: color .15s, border-color .15s;
}

.school-logout:hover { color: var(--danger); border-color: var(--danger); }

/* Mobile menu: hamburger lives in each tab’s .lessons-top-bar-inner; menu panel is fixed */
.mobile-nav-slot {
    display: none;
    align-items: center;
    flex-shrink: 0;
    margin-right: 4px;
}

.mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin: 0;
    padding: 0;
    border: none;
    border-radius: var(--radius);
    background: transparent;
    color: var(--text-bright);
    cursor: pointer;
    transition: background .12s;
}

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

.mobile-menu-toggle-bars {
    display: block;
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    position: relative;
}

.mobile-menu-toggle-bars::before,
.mobile-menu-toggle-bars::after {
    content: '';
    position: absolute;
    left: 0;
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
}

.mobile-menu-toggle-bars::before { top: -7px; }
.mobile-menu-toggle-bars::after { top: 7px; }

.mobile-nav-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 85;
    background: rgba(0, 0, 0, 0.45);
}

.mobile-nav-backdrop:not([hidden]) {
    display: block;
}

.mobile-nav-panel {
    position: fixed;
    left: max(8px, env(safe-area-inset-left, 0px));
    top: max(52px, calc(env(safe-area-inset-top, 0px) + 44px));
    z-index: 90;
    min-width: min(280px, calc(100vw - 24px));
    max-width: calc(100vw - 16px);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

.mobile-nav-panel:not([hidden]) {
    display: block;
}

.mobile-nav-panel[hidden] {
    display: none !important;
}

.mobile-nav-panel-inner {
    display: flex;
    flex-direction: column;
    max-height: min(70vh, 480px);
}

.mobile-nav-panel .school-main-nav {
    flex: 0 0 auto;
    overflow-y: auto;
    list-style: none;
    margin: 0;
    padding: 6px 0;
}

.mobile-nav-footer {
    flex-shrink: 0;
    border-top: 1px solid var(--border);
    padding: 12px 14px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.mobile-nav-user-info {
    font-size: 12px;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    flex: 1;
}

.mobile-nav-user-info strong {
    display: block;
    color: var(--text);
    font-size: 13px;
}

/* Main content area */
.main-content {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: var(--main-pad-y) var(--main-pad-x);
}

.main-content:has(#view-lessons.active),
.main-content:has(#view-reservations.active),
.main-content:has(#view-users.active) {
    --main-pad-x: var(--main-pad-x-schedule);
}

/* Users view: fill remaining viewport height so the master–detail split can grow */
.main-content:has(#view-users.active) {
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
}

.view { display: none; }
.view.active { display: block; }

.view h2 {
    font-size: 18px;
    color: var(--text-bright);
    margin-bottom: 20px;
}

.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;
}

/* ── Tables ──────────────────────────────────────────── */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.data-table th {
    text-align: left;
    padding: 10px 12px;
    background: var(--bg-sidebar);
    color: var(--text-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
}

.data-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}

.data-table tr:hover td { background: var(--bg-hover); }

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-admin  { background: rgba(0,120,212,.2); color: var(--accent); }
.badge-student { background: rgba(78,201,176,.15); color: var(--success); }
.badge-active { background: rgba(78,201,176,.15); color: var(--success); }
.badge-inactive { background: rgba(241,76,76,.12); color: var(--danger); }
.badge-paid { background: rgba(78,201,176,.15); color: var(--success); }
.badge-unpaid { background: rgba(255,180,80,.12); color: #e0a030; }

/* ── Buttons ─────────────────────────────────────────── */
.btn {
    padding: 7px 14px;
    border: none;
    border-radius: var(--radius);
    font-size: 13px;
    cursor: pointer;
    transition: background .15s;
}

.btn-primary   { background: var(--accent);  color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger    { background: var(--danger);  color: #fff; }
.btn-danger:hover  { background: var(--danger-hover); }
.btn-sm        { padding: 4px 10px; font-size: 12px; }

.action-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
}

/* ── Modal ───────────────────────────────────────────── */
.modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 10050;
    align-items: center;
    justify-content: center;
}

.modal-backdrop.active { display: flex; }

.modal-backdrop-scrim {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 0;
}

.modal {
    position: relative;
    z-index: 1;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 28px 20px;
    width: 400px;
    max-width: 90vw;
}

.modal h3 {
    font-size: 16px;
    color: var(--text-bright);
    margin-bottom: 18px;
}

.modal-hint {
    font-size: 13px;
    color: var(--text-muted);
    margin: -8px 0 16px;
    line-height: 1.4;
}

.input-wide,
.modal select.input-wide {
    width: 100%;
}

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.form-group label.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 0;
    cursor: pointer;
    font-size: 13px;
    color: var(--text);
}

.form-group label.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-bright);
    font-size: 13px;
    outline: none;
    box-sizing: border-box;
}

.form-group textarea {
    resize: vertical;
    min-height: 4.5em;
    line-height: 1.4;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--accent); }

.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin: 6px 0 0;
    line-height: 1.35;
}

.form-warning {
    margin: 8px 0 0;
    line-height: 1.4;
}

.form-warning--danger {
    font-size: 12px;
    font-weight: 500;
    color: var(--danger);
    padding: 8px 10px;
    border-radius: var(--radius);
    border: 1px solid color-mix(in srgb, var(--danger) 45%, var(--border));
    background: color-mix(in srgb, var(--danger) 10%, var(--bg-card));
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 20px;
}

.btn-ghost {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    padding: 7px 14px;
    font-size: 13px;
    cursor: pointer;
}

.btn-ghost:hover { background: var(--bg-hover); }

/* ── Week reservation grid ───────────────────────────── */
.week-toolbar {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 8px;
}

.week-nav-btn {
    flex-shrink: 0;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .12s;
}

.week-nav-btn:hover { background: var(--bg-hover); }

.week-label {
    font-size: 15px;
    color: var(--text-bright);
    min-width: 0;
    flex: 1 1 12rem;
    max-width: 100%;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.week-edit-toggle {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
    user-select: none;
}

.week-edit-toggle input { cursor: pointer; }

.week-grid {
    display: flex;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
}

.week-time-gutter {
    min-width: 44px;
    border-right: 1px solid var(--border);
    padding-top: var(--week-day-header-h);
}

.gutter-label {
    display: flex;
    align-items: flex-start;
    justify-content: flex-end;
    padding-right: 6px;
    font-size: 11px;
    color: var(--text-muted);
    border-bottom: 1px solid transparent;
    line-height: 1;
    transform: translateY(-6px);
}

.week-day-col {
    flex: 1;
    min-width: 100px;
    border-right: 1px solid var(--border);
}

.week-day-col:last-child { border-right: none; }

.week-day-col.today {
    position: relative;
    z-index: 1;
    --today-col-outline: rgba(200, 200, 205, 0.4);
    box-shadow:
        inset 0 0 0 9999px rgba(255, 255, 255, 0.028),
        inset 0 1px 0 0 var(--today-col-outline),
        inset 0 -1px 0 0 var(--today-col-outline),
        inset 1px 0 0 0 var(--today-col-outline),
        inset -1px 0 0 0 var(--today-col-outline);
}

.week-day-col.weekend {
    background: rgba(255, 186, 120, 0.022);
}

.week-day-col.weekend .week-day-header {
    background: rgba(255, 186, 120, 0.04);
}

.week-day-col.today .week-day-header {
    color: var(--text);
    border-bottom-color: var(--border);
    background: color-mix(in srgb, var(--bg-sidebar) 78%, white 22%);
}

.week-day-col.today.weekend .week-day-header {
    background: color-mix(in srgb, var(--bg-sidebar) 68%, white 32%);
}

.week-day-header {
    height: var(--week-day-header-h);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text);
    border-bottom: 2px solid var(--border);
    background: var(--bg-sidebar);
    position: sticky;
    top: 0;
    z-index: 2;
}

.week-day-header .day-name { font-weight: 600; }
.week-day-header .day-num  { color: var(--text-muted); }

.week-day-body {
    position: relative;
}

.week-slot-row {
    border-bottom: 1px solid var(--border);
    transition: background .08s;
}

.week-slot-row:nth-child(odd) {
    border-bottom-color: rgba(62, 62, 66, .35);
}

.week-slot-row:hover {
    background: var(--bg-hover);
}

.slot-available {
    position: absolute;
    left: 1px;
    right: 1px;
    background: rgba(78, 201, 176, .15);
    border: 1px solid rgba(78, 201, 176, .35);
    border-radius: 4px;
    z-index: 1;
    pointer-events: auto;
    transition: background .12s;
}

/* Let clicks/drags reach .slot-reservation and .week-slot-row; edit mode uses .editable */
.slot-available:not(.editable) {
    pointer-events: none;
}

.slot-available:hover {
    background: rgba(78, 201, 176, .25);
}

.slot-available.preview {
    background: rgba(78, 201, 176, .25);
    border-style: dashed;
    pointer-events: none;
}

.slot-available.editable {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 1px 3px 0;
    touch-action: none;
}

.slot-available.resizing,
.slot-available.moving {
    z-index: 5;
    box-shadow: 0 0 8px rgba(78, 201, 176, .4);
}

.avail-time-label {
    font-size: 10px;
    color: var(--success);
    pointer-events: none;
    white-space: nowrap;
}

.avail-delete-btn {
    font-size: 14px;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    padding: 0 2px;
    transition: color .12s;
}

.avail-delete-btn:hover { color: var(--danger); }

.avail-resize-handle {
    position: absolute;
    left: 0;
    right: 0;
    height: 6px;
    z-index: 2;
    cursor: ns-resize;
    background: transparent;
    transition: background .12s;
}

.avail-resize-handle-bottom {
    bottom: 0;
    top: auto;
    border-radius: 0 0 4px 4px;
}

.avail-resize-handle-top {
    top: 0;
    bottom: auto;
    border-radius: 4px 4px 0 0;
}

.avail-resize-handle-top:hover,
.avail-resize-handle-bottom:hover,
.slot-available.resizing .avail-resize-handle-top,
.slot-available.resizing .avail-resize-handle-bottom {
    background: rgba(78, 201, 176, .45);
}

.slot-reservation {
    position: absolute;
    left: 2px;
    right: 2px;
    /* stacking for absolutely positioned lesson-mode icon above ::after overlays */
    isolation: isolate;
    background: rgba(0, 120, 212, .25);
    border: 1px solid rgba(0, 120, 212, .5);
    border-radius: 4px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 1px 4px;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

.slot-reservation.own {
    background: rgba(0, 120, 212, .35);
    border-color: var(--accent);
}

.slot-reservation:hover {
    background: rgba(0, 120, 212, .4);
}

.slot-reservation.original-slot:hover {
    background: rgba(236, 72, 153, .52);
}

.slot-reservation.original-slot.own:hover {
    background: rgba(195, 135, 158, .22);
}

.slot-reservation.change-pending:hover {
    background: rgba(236, 72, 153, .3);
}

.slot-reservation.change-pending.own:hover {
    background: rgba(236, 72, 153, .34);
}

.slot-reservation .res-name {
    position: relative;
    z-index: 1;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-bright);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.slot-reservation .res-time {
    position: relative;
    z-index: 1;
    font-size: 10px;
    color: var(--text-muted);
}

.slot-reservation .res-lesson-mode-icon {
    position: absolute;
    top: 2px;
    right: 2px;
    z-index: 4;
    line-height: 0;
    color: var(--text-bright);
    opacity: 0.92;
    pointer-events: none;
}

.slot-reservation .res-lesson-mode-icon svg {
    width: 14px;
    height: 14px;
    display: block;
}

.slot-reservation .res-paid-icon {
    position: absolute;
    bottom: 2px;
    right: 2px;
    z-index: 5;
    line-height: 0;
    color: #22c55e;
    pointer-events: none;
}

.slot-reservation .res-paid-icon svg {
    width: 22px;
    height: 22px;
    display: block;
}

.slot-reservation.own { cursor: grab; }
.slot-reservation.moving {
    cursor: grabbing;
    opacity: .8;
    box-shadow: 0 4px 12px rgba(0,0,0,.4);
    z-index: 20;
}

.slot-reservation.drop-invalid {
    border-color: var(--danger);
    background: rgba(244, 67, 54, .25);
    opacity: .55;
}

/* Pointer/touch drag (reservations.js); avoids browser scroll stealing the gesture */
.slot-reservation.slot-reservation--draggable {
    touch-action: none;
}

.slot-reservation.pending {
    justify-content: flex-start;
    padding-top: 2px;
    background: rgba(231, 160, 35, .18);
    border-color: rgba(231, 160, 35, .55);
}

.slot-reservation.pending.own {
    background: rgba(231, 160, 35, .26);
    border-color: rgba(244, 190, 80, .75);
}

/* Original time while a change is pending: same pink family as requested slot, more opaque + dashed */
.slot-reservation.original-slot {
    background: rgba(236, 72, 153, .44);
    border: 1px dashed rgba(244, 114, 182, .9);
}

/* Student’s “old” time: greyed fill; border matches requested slot pink, dashed */
.slot-reservation.original-slot.own {
    background: rgba(185, 125, 150, .14);
    border: 1px dashed rgba(244, 114, 182, .85);
}

.slot-reservation.original-slot.own .res-name {
    color: rgba(220, 185, 200, .95);
}

.slot-reservation.original-slot.own .res-time {
    color: rgba(175, 145, 165, .88);
}

.slot-reservation.change-pending {
    background: rgba(236, 72, 153, .22);
    border: 1px solid rgba(236, 72, 153, .65);
}

.slot-reservation.change-pending.own {
    background: rgba(236, 72, 153, .28);
    border-color: rgba(244, 114, 182, .85);
}

.slot-reservation.change-request-drag {
    outline: 1px dashed rgba(0, 120, 212, .7);
    outline-offset: 1px;
}

.res-status.change-status {
    color: #f472b6;
}

.slot-reservation .res-status.res-status--absent {
    color: #fecaca;
}

/* Absent (lesson did not take place) — full red tile */
.slot-reservation.lesson-not-took-place {
    background: rgba(185, 28, 28, .34);
    border-color: rgba(220, 38, 38, .88);
}

.slot-reservation.lesson-not-took-place.own {
    background: rgba(185, 28, 28, .4);
    border-color: rgba(248, 113, 113, .92);
}

.slot-reservation.lesson-not-took-place:hover {
    background: rgba(185, 28, 28, .46);
    border-color: rgba(252, 165, 165, .95);
}

.slot-reservation.lesson-not-took-place.own:hover {
    background: rgba(185, 28, 28, .5);
}

.slot-reservation.lesson-not-took-place .res-name,
.slot-reservation.lesson-not-took-place .res-time,
.slot-reservation.lesson-not-took-place .res-status {
    z-index: 2;
}

.slot-reservation.lesson-not-took-place .res-name {
    color: #fecaca;
}

.slot-reservation.lesson-not-took-place .res-time {
    color: rgba(254, 202, 202, .88);
}

.slot-reservation.lesson-not-took-place .res-lesson-mode-icon {
    color: #fecaca;
}

.slot-reservation.lesson-not-took-place .res-paid-icon {
    color: #86efac;
}

.slot-reservation .res-status {
    position: relative;
    z-index: 1;
    font-size: 9px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--warning);
    margin-top: 2px;
}

/* Lesson took place — diagonal stripe overlay */
.slot-reservation.lesson-took-place::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    border-radius: inherit;
    pointer-events: none;
    background: repeating-linear-gradient(
        -45deg,
        transparent,
        transparent 4px,
        rgba(255, 255, 255, .08) 4px,
        rgba(255, 255, 255, .08) 8px
    );
}

/* Absent — subtle top shading (tile fill is already red) */
.slot-reservation.lesson-not-took-place::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(0, 0, 0, .1) 0%, transparent 45%);
}

/* ── Context menus (reservation actions + book slot) ─ */
#reservation-context-menu.context-menu,
#booking-context-menu.context-menu {
    position: fixed;
    z-index: 10000;
    min-width: 200px;
    max-width: min(320px, calc(100vw - 16px));
    padding: 4px 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, .45);
}

#reservation-context-menu .context-menu-item,
#booking-context-menu .context-menu-item {
    display: block;
    width: 100%;
    text-align: left;
    padding: 8px 14px;
    font-size: 13px;
    color: var(--text);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background .1s;
}

#booking-context-menu .context-menu-item-book {
    white-space: normal;
    line-height: 1.35;
}

#booking-context-menu .context-menu-book-admin {
    padding: 8px 12px 6px;
    min-width: 240px;
}

#booking-context-menu .context-menu-book-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 10px;
    line-height: 1.35;
}

#booking-context-menu .context-menu-book-label {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 4px;
}

#booking-context-menu .context-menu-book-select {
    width: 100%;
    margin-bottom: 10px;
    padding: 8px 10px;
    font-size: 13px;
    color: var(--text);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
}

#booking-context-menu .context-menu-item-book-submit {
    border-radius: var(--radius);
    margin: 0 -12px -6px;
    width: calc(100% + 24px);
}

#booking-context-menu .context-menu-item-book-submit:disabled {
    opacity: .45;
    cursor: not-allowed;
}

#reservation-context-menu .context-menu-item:hover,
#booking-context-menu .context-menu-item:hover {
    background: var(--bg-hover);
}

#reservation-context-menu .context-menu-item.danger {
    color: var(--danger);
}

#reservation-context-menu .context-menu-item.danger:hover {
    background: rgba(241, 76, 76, .12);
}

/* ── Placeholder / empty state ───────────────────────── */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state .icon { font-size: 38px; margin-bottom: 12px; }
.empty-state p { font-size: 14px; }

/* ── Users view (admin): table left, details right; stacked on narrow viewports ── */
#view-users.view.active {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

#view-users .lessons-top-bar {
    flex-shrink: 0;
    margin-bottom: 12px;
}

#view-users .lessons-top-bar-inner {
    justify-content: space-between;
    width: 100%;
}

#view-users .users-toolbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

#view-users #btn-add-user {
    flex-shrink: 0;
}

#view-users .users-split {
    margin-top: 0;
}

.users-split {
    flex: 1;
    min-height: 0;
    min-width: 0;
    display: flex;
    flex-direction: row;
    align-items: stretch;
    gap: 12px;
    margin-top: 12px;
    border: none;
    border-radius: 0;
    overflow: hidden;
    background: transparent;
}

.users-table-wrap {
    flex: 1 1 0;
    min-width: 0;
    min-height: 0;
    max-width: 100%;
    overflow: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
}

.users-table-wrap .data-table {
    margin: 0;
}

.data-table tbody tr.user-row {
    cursor: pointer;
}

.data-table tbody tr.user-row td {
    user-select: none;
}

.data-table tbody tr.user-row.selected td {
    background: color-mix(in srgb, var(--accent) 16%, var(--bg-sidebar));
}

.data-table tbody tr.user-row.selected:hover td {
    background: color-mix(in srgb, var(--accent) 22%, var(--bg-hover));
}

.users-detail-panel {
    flex: 0 0 min(360px, 38vw);
    min-width: 240px;
    max-width: 420px;
    min-height: 0;
    box-sizing: border-box;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
    align-self: stretch;
}

.users-detail-content {
    font-size: 13px;
    color: var(--text);
    line-height: 1.45;
}

.users-detail-section,
.users-detail-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
    padding: 10px 12px;
    margin-bottom: 10px;
}

.users-detail-section:last-child,
.users-detail-card:last-child {
    margin-bottom: 0;
}

.users-detail-billing {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 0;
    border: none;
    padding: 0;
    background: transparent;
}

.users-detail-billing .users-detail-card {
    margin-bottom: 0;
}

.users-detail-billing > .users-detail-section--notes {
    margin-bottom: 0;
}

.users-detail-content .users-detail-heading {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 0 0 8px;
}

.users-detail-profile-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
}

.users-detail-profile-head .users-detail-heading {
    margin-bottom: 0;
}

.users-detail-edit-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    flex-shrink: 0;
    padding: 7px 14px;
    font-family: inherit;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-bright);
    background: linear-gradient(
        165deg,
        color-mix(in srgb, var(--accent) 22%, var(--bg-card)) 0%,
        color-mix(in srgb, var(--accent) 6%, var(--bg-hover)) 100%
    );
    border: 1px solid color-mix(in srgb, var(--accent) 50%, var(--border));
    border-radius: 999px;
    box-shadow:
        0 1px 0 color-mix(in srgb, #fff 8%, transparent),
        0 2px 10px rgba(0, 0, 0, 0.28);
    cursor: pointer;
    transition:
        transform 0.12s ease,
        box-shadow 0.12s ease,
        border-color 0.12s ease,
        background 0.12s ease;
}

.users-detail-edit-btn:hover {
    border-color: color-mix(in srgb, var(--accent) 72%, var(--border));
    background: linear-gradient(
        165deg,
        color-mix(in srgb, var(--accent) 30%, var(--bg-card)) 0%,
        color-mix(in srgb, var(--accent) 12%, var(--bg-hover)) 100%
    );
    box-shadow:
        0 1px 0 color-mix(in srgb, #fff 10%, transparent),
        0 4px 16px color-mix(in srgb, var(--accent) 28%, transparent);
    transform: translateY(-1px);
}

.users-detail-edit-btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
}

.users-detail-edit-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.users-detail-edit-btn-icon {
    flex-shrink: 0;
    opacity: 0.92;
}

.users-detail-content .users-detail-dl {
    margin: 0;
}

.users-detail-content .users-detail-dl dt {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 8px;
    margin-bottom: 2px;
}

.users-detail-content .users-detail-dl dt:first-child {
    margin-top: 0;
}

.users-detail-content .users-detail-dl dd {
    margin: 0;
    color: var(--text-bright);
    word-break: break-word;
}

.users-detail-content .users-detail-dl--profile-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 10px 16px;
    align-items: start;
}

.users-detail-content .users-detail-dl--profile-grid .users-detail-field {
    min-width: 0;
}

.users-detail-content .users-detail-dl--profile-grid dt {
    margin-top: 0;
}

.users-detail-section--notes-idle {
    opacity: 0.92;
}

.users-detail-notes-idle-hint {
    margin: 0;
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
    line-height: 1.4;
}

.users-detail-section--notes .users-detail-notes-panel {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 140px;
}

.users-detail-notes-scroll {
    flex: 1;
    min-height: 72px;
    max-height: min(280px, 42vh);
    overflow-y: auto;
    padding-right: 4px;
}

.users-detail-note {
    position: relative;
    margin-bottom: 10px;
    padding-bottom: 10px;
    padding-right: 28px;
    border-bottom: 1px solid var(--border);
}

.users-detail-note:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.users-detail-note-remove {
    position: absolute;
    top: -4px;
    right: -2px;
    width: 22px;
    height: 22px;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    font-family: inherit;
}

.users-detail-note-remove:hover {
    color: var(--danger);
    background: color-mix(in srgb, var(--danger) 14%, transparent);
}

.users-detail-note-remove:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.users-detail-note-remove-x {
    font-size: 16px;
    font-weight: 600;
    line-height: 1;
    position: relative;
    top: -0.5px;
}

.users-detail-note-date {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    min-width: 0;
    margin-bottom: 4px;
}

.users-detail-note-body {
    font-size: 13px;
    color: var(--text-bright);
    white-space: pre-wrap;
    word-break: break-word;
}

.users-detail-notes-empty,
.users-detail-notes-loading,
.users-detail-notes-error {
    margin: 0;
    font-size: 12px;
    color: var(--text-muted);
}

.users-detail-notes-error {
    color: var(--danger);
}

.users-detail-notes-composer {
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    gap: 8px;
    flex-shrink: 0;
}

.users-detail-notes-input {
    flex: 1;
    min-width: 0;
    min-height: 3.25em;
    max-height: 8em;
    padding: 8px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-bright);
    font-size: 13px;
    line-height: 1.4;
    resize: vertical;
    box-sizing: border-box;
    font-family: inherit;
}

.users-detail-notes-input:focus {
    border-color: var(--accent);
    outline: none;
}

.users-detail-content .users-detail-placeholder {
    color: var(--text-muted);
    font-style: italic;
    margin: 0;
}

.users-detail-content .users-detail-more {
    margin-top: 4px;
    padding: 8px 10px;
    border: 1px dashed color-mix(in srgb, var(--border) 85%, transparent);
    border-radius: var(--radius);
    font-size: 12px;
    color: var(--text-muted);
    background: color-mix(in srgb, var(--bg-card) 40%, transparent);
}

.users-detail-section .users-detail-billing-note {
    margin: 0;
}

.users-detail-billing-note,
.users-detail-billing-loading,
.users-detail-billing-error {
    margin: 12px 0 0;
    font-size: 12px;
    color: var(--text-muted);
}

.users-detail-card .users-detail-billing-loading,
.users-detail-card .users-detail-billing-error {
    margin: 0;
}

.users-detail-billing + .users-detail-more {
    margin-top: 10px;
}

.users-detail-billing-error {
    color: var(--danger);
}

.users-detail-heading-spaced {
    margin-top: 0;
}

.users-detail-stats-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 11px;
    margin: 6px 0 0;
    border: 1px solid var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.users-detail-stats-table th,
.users-detail-stats-table td {
    padding: 5px 8px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.users-detail-stats-table thead th {
    border-bottom: 1px solid var(--border);
    background: color-mix(in srgb, var(--bg-input) 65%, var(--bg-card));
}

.users-detail-stats-table th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.users-detail-stats-table td.num,
.users-detail-lesson-stats th:nth-child(3),
.users-detail-lesson-stats td.num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.users-detail-stats-table tfoot td {
    border-bottom: none;
    font-weight: 600;
    padding-top: 6px;
}

.users-detail-due-label {
    text-align: right !important;
    color: var(--text-muted);
    font-weight: 500 !important;
}

.users-detail-due-value {
    text-align: right;
    color: var(--text-bright);
}

.users-detail-stats-empty {
    color: var(--text-muted);
    font-style: italic;
}

.users-detail-price-history th:nth-child(2),
.users-detail-price-history td:nth-child(2) {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

@media (max-width: 720px) {
    .app-shell-left {
        display: none !important;
    }

    .mobile-nav-slot {
        display: flex;
    }

    .users-split {
        flex-direction: column;
        align-items: stretch;
        overflow-x: hidden;
        overflow-y: auto;
    }

    .users-table-wrap {
        flex: 0 0 auto;
        min-height: 0;
        overflow-x: auto;
        overflow-y: hidden;
        border-bottom: none;
        max-width: 100%;
    }

    .users-detail-panel {
        flex: 0 0 auto;
        min-width: 0;
        max-width: none;
        width: 100%;
        align-self: stretch;
    }

    .users-detail-content .users-detail-dl--profile-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    /* Compact week reservation grid (slot height is also reduced in reservations.js) */
    .week-grid {
        --week-day-header-h: 26px;
        font-size: 0.92em;
    }

    .week-time-gutter {
        min-width: 36px;
    }

    .week-day-col {
        min-width: 72px;
    }

    .week-day-header {
        font-size: 11px;
        gap: 4px;
        padding: 0 4px;
    }

    .gutter-label {
        font-size: 9px;
        padding-right: 4px;
    }

    .slot-reservation .res-name {
        font-size: 10px;
    }

    .slot-reservation .res-time {
        font-size: 9px;
    }

    .avail-time-label {
        font-size: 9px;
    }
}

/*
 * Lessons / Reservations / Users top bar: same bar background and edge as .sidebar.
 */
.lessons-top-bar {
    --lessons-bar-bg: var(--bg-sidebar);
    --lessons-bar-edge: var(--border);
    --lessons-bar-input-bg: #131316;
    --lessons-bar-input-border: #35353a;
    --lessons-bar-text: #e8e8ec;
    --lessons-bar-muted: #8a8a92;
    --lessons-bar-accent: #0e639c;
    --lessons-bar-hover: #27272c;
    --lessons-bar-font: ui-monospace, 'Cascadia Code', 'Cascadia Mono', 'Segoe UI Mono', monospace;

    margin-top: calc(-1 * var(--main-pad-y));
    margin-left: calc(-1 * var(--main-pad-x));
    margin-right: calc(-1 * var(--main-pad-x));
    padding: var(--app-topbar-pad-y, 11px) var(--main-pad-x);
    margin-bottom: 12px;
    border-bottom: 1px solid var(--lessons-bar-edge);
    background: var(--lessons-bar-bg);
    font-family: var(--lessons-bar-font);
    font-size: 12px;
    color: var(--lessons-bar-text);
}

.lessons-top-bar-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px 16px;
    /* Same row height across Reservations / Lessons / Users (mobile menu = 44px; centers shorter controls). */
    min-height: var(--app-topbar-inner-min-h, 44px);
    box-sizing: border-box;
}

.lessons-top-bar .mobile-menu-toggle {
    color: var(--lessons-bar-text);
}

.lessons-top-bar .mobile-menu-toggle:hover {
    background: var(--lessons-bar-hover);
}

.lessons-search-field {
    flex: 1;
    min-width: 140px;
    max-width: min(480px, 100%);
    position: relative;
    display: flex;
    align-items: center;
}

.lessons-search-input {
    width: 100%;
    box-sizing: border-box;
    padding: 8px 38px 8px 12px;
    font-family: var(--lessons-bar-font);
    font-size: 12px;
    color: var(--lessons-bar-text);
    background: var(--lessons-bar-input-bg);
    border: 1px solid var(--lessons-bar-input-border);
    border-radius: 4px;
}

.lessons-search-input::placeholder {
    color: var(--lessons-bar-muted);
}

.lessons-search-input:focus {
    outline: none;
    border-color: var(--lessons-bar-accent);
    box-shadow: 0 0 0 1px rgba(14, 99, 156, 0.35);
}

.lessons-search-input::-webkit-search-cancel-button {
    -webkit-appearance: none;
    appearance: none;
}

.lessons-search-clear {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    padding: 0;
    line-height: 1;
    font-size: 18px;
    font-family: var(--lessons-bar-font);
    color: var(--lessons-bar-muted);
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color .12s, background .12s;
}

.lessons-search-clear:hover {
    color: var(--lessons-bar-text);
    background: var(--lessons-bar-hover);
}

.lessons-search-clear[hidden] {
    display: none !important;
}

.lessons-user-filter-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--lessons-bar-font);
    font-size: 12px;
    color: var(--lessons-bar-muted);
    flex-shrink: 0;
}

/* `hidden` must win over `display: flex` above (author CSS overrides UA [hidden]). */
.lessons-user-filter-wrap[hidden] {
    display: none !important;
}

.lessons-filter-label {
    white-space: nowrap;
}

.lessons-user-filter {
    min-width: 200px;
    max-width: min(360px, 100vw - 48px);
    padding: 8px 10px;
    font-family: var(--lessons-bar-font);
    font-size: 12px;
    color: var(--lessons-bar-text);
    background: var(--lessons-bar-input-bg);
    border: 1px solid var(--lessons-bar-input-border);
    border-radius: 4px;
    cursor: pointer;
}

.lessons-user-filter:hover {
    border-color: color-mix(in srgb, var(--lessons-bar-accent) 45%, var(--lessons-bar-input-border));
}

.lessons-user-filter:focus {
    outline: none;
    border-color: var(--lessons-bar-accent);
    box-shadow: 0 0 0 1px rgba(14, 99, 156, 0.35);
}

/* Reservations: week controls in the same top bar as Lessons */
.lessons-top-bar .week-toolbar {
    margin-bottom: 0;
    margin-left: auto;
    flex: 0 0 auto;
    justify-content: flex-end;
    flex-wrap: nowrap;
    gap: 8px 10px;
    max-width: 400px;
    width: min(400px, 100%);
    box-sizing: border-box;
    padding: 4px 6px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.lessons-top-bar .week-nav-btn {
    background: var(--lessons-bar-input-bg);
    border: 1px solid var(--lessons-bar-input-border);
    color: var(--lessons-bar-text);
}

.lessons-top-bar .week-nav-btn:hover {
    background: var(--lessons-bar-hover);
}

.lessons-top-bar .week-label {
    font-family: var(--lessons-bar-font);
    font-size: 12px;
    color: var(--lessons-bar-text);
    min-width: 0;
    flex: 1 1 0;
    max-width: 100%;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lessons-top-bar .week-toolbar #week-today,
.lessons-top-bar .week-toolbar .week-edit-toggle {
    flex-shrink: 0;
}

.lessons-top-bar #week-today.btn {
    margin-left: 0;
    background: var(--lessons-bar-accent);
    border: 1px solid color-mix(in srgb, var(--lessons-bar-accent) 75%, #fff 25%);
    color: #fff;
    font-family: var(--lessons-bar-font);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 6px 12px;
    border-radius: 4px;
}

.lessons-top-bar #week-today.btn:hover {
    filter: brightness(1.1);
}

.lessons-top-bar .week-edit-toggle {
    margin-left: auto;
    color: var(--lessons-bar-muted);
    font-family: var(--lessons-bar-font);
    font-size: 12px;
}

.lessons-top-bar .week-edit-toggle:hover {
    color: var(--lessons-bar-text);
}

.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.lessons-error {
    color: var(--danger);
    padding: 12px 0;
}

.lesson-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.lesson-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px 12px;
    width: 100%;
    padding: 11px 12px;
    font: inherit;
    color: var(--text);
    background: transparent;
    cursor: pointer;
    transition: background .12s;
    box-sizing: border-box;
}

.lesson-header:hover {
    background: var(--bg-hover);
}

.lesson-header-primary {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 12px;
    flex: 1 1 220px;
    min-width: 0;
}

.lesson-header-meta {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    flex: 1 1 200px;
    min-width: 0;
    margin-left: auto;
    text-align: right;
}

.lesson-header-main {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: flex-end;
    gap: 8px 14px;
    min-width: 0;
    flex: 1;
}

.lesson-card-title-input {
    flex: 1 1 180px;
    min-width: 160px;
    max-width: 100%;
    padding: 7px 11px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-bright);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-sizing: border-box;
    cursor: text;
    pointer-events: auto;
}

.lesson-header .lesson-card-title-input:hover {
    background: var(--bg-input);
}

.lesson-card-title-input::placeholder {
    font-weight: 400;
    color: var(--text-muted);
}

.lesson-card-title-readonly {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-bright);
    line-height: 1.3;
}

.lesson-number {
    font-weight: 600;
    color: var(--text-bright);
}

.lesson-student {
    color: var(--accent);
    font-size: 13px;
}

/* Mode + date share one row; mode sits to the left of the date */
.lesson-when-row {
    display: inline-flex;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    flex-shrink: 0;
    max-width: 100%;
}

.lesson-when {
    color: var(--text-muted);
    font-size: 12px;
    white-space: nowrap;
}

.lesson-header-mode {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    flex-shrink: 0;
    font-size: 12px;
}

.lesson-header-mode-label {
    font-weight: 500;
    color: var(--text-bright);
}

.lesson-header .lesson-header-mode .res-lesson-mode-icon {
    position: static;
    top: auto;
    right: auto;
    opacity: 1;
    pointer-events: none;
    color: var(--text-muted);
}

.lesson-header .lesson-header-mode .res-lesson-mode-icon svg {
    width: 15px;
    height: 15px;
}

.lesson-header-paid {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
    font-size: 12px;
    color: #22c55e;
}

.lesson-header-paid-label {
    font-weight: 600;
    color: #22c55e;
}

.lesson-header .lesson-header-paid .res-paid-icon {
    position: static;
    opacity: 1;
    pointer-events: none;
    color: #22c55e;
}

.lesson-header .lesson-header-paid .res-paid-icon svg {
    width: 15px;
    height: 15px;
}

.lesson-chevron {
    flex-shrink: 0;
    font-size: 11px;
    color: var(--text-muted);
    transition: transform .2s ease;
}

.lesson-card.expanded .lesson-chevron {
    transform: rotate(-180deg);
}

.lesson-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height .28s ease;
    border-top: 1px solid transparent;
}

.lesson-card.expanded .lesson-body {
    max-height: min(85vh, 2000px);
    border-top-color: var(--border);
}

.lesson-body-inner {
    max-height: min(80vh, 1900px);
    overflow-y: auto;
    padding: 8px 10px 10px;
}

.lesson-chapters {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.lesson-chapter {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.lesson-chapter-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    width: 100%;
    padding: 8px 10px;
    text-align: left;
    font: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-bright);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background .12s;
}

/* Daako Flow–style section icon: colored glyph on soft tinted tile */
.lesson-chapter-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1;
    text-align: left;
}

.lesson-chapter-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.lesson-chapter-icon svg {
    display: block;
}

.lesson-chapter-title {
    flex: 1;
    min-width: 0;
}

.lesson-chapter-header:hover {
    background: var(--bg-hover);
}

.lesson-chapter-chevron {
    flex-shrink: 0;
    font-size: 11px;
    color: var(--text-muted);
    transition: transform .2s ease;
}

.lesson-chapter.expanded .lesson-chapter-chevron {
    transform: rotate(-180deg);
}

.lesson-ch1-header-row {
    display: flex;
    align-items: stretch;
    gap: 4px;
}

.lesson-ch1-header-row .lesson-chapter-header {
    flex: 1;
    min-width: 0;
}

.lesson-ch1-header-add {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    padding: 0;
    font: inherit;
    color: var(--text-muted);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: color .12s, background .12s, border-color .12s;
}

.lesson-ch1-header-add:hover {
    color: var(--accent);
    background: var(--bg-hover);
    border-color: var(--border);
}

.lesson-ch1-header-add:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.lesson-chapter-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height .26s ease;
    border-top: 1px solid transparent;
}

.lesson-chapter.expanded .lesson-chapter-body {
    max-height: 480px;
    border-top-color: var(--border);
}

.lesson-chapter-body-inner {
    padding: 8px 10px 10px;
    max-height: 440px;
    overflow-y: auto;
}

.lesson-chapter-textarea {
    width: 100%;
    min-height: 120px;
    max-height: 360px;
    padding: 8px 10px;
    font-size: 13px;
    line-height: 1.45;
    color: var(--text);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    resize: vertical;
    box-sizing: border-box;
    font-family: inherit;
}

.lesson-chapter-readonly {
    font-size: 13px;
    line-height: 1.45;
    color: var(--text);
    white-space: pre-wrap;
    word-break: break-word;
}

.lesson-chapter-readonly.is-empty {
    color: var(--text-muted);
    font-style: italic;
}

.lesson-chapter-placeholder {
    font-size: 12px;
    color: var(--text-muted);
    margin: 0;
}

.lesson-chapter[data-chapter="1"].expanded .lesson-chapter-body {
    max-height: min(72vh, 1200px);
}

.lesson-chapter[data-chapter="1"] .lesson-chapter-body-inner {
    max-height: min(68vh, 1100px);
}

/* Chapter 1: multiple note tiles (stack on narrow screens, columns on wide) */
.lesson-ch1-notes-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

@media (min-width: 640px) {
    .lesson-ch1-notes-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

.lesson-ch1-note-tile {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    /* Barely visible against chapter (--bg-input): faint lift + soft edge */
    background: color-mix(in srgb, var(--text-bright) 4.5%, var(--bg-input));
    border: 1px solid color-mix(in srgb, var(--border) 38%, var(--bg-input));
    border-radius: var(--radius);
    box-sizing: border-box;
    min-width: 0;
}

.lesson-ch1-note-toolbar {
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
}

.lesson-ch1-note-title-input {
    flex: 1;
    min-width: 0;
    padding: 11px 14px;
    font: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-bright);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-sizing: border-box;
}

.lesson-ch1-note-title-input::placeholder {
    color: var(--text-muted);
    font-weight: 500;
}

.lesson-ch1-note-tile .lesson-ch1-note-textarea {
    min-height: 3.2em;
    max-height: none;
    padding: 14px 16px;
    resize: none;
    overflow: hidden;
    line-height: 1.45;
    background: var(--bg-input);
}

.lesson-ch1-note-readonly-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 8px;
    padding: 0 4px;
    word-break: break-word;
}

.lesson-ch1-note-readonly-body {
    font-size: 13px;
    line-height: 1.45;
    color: var(--text);
    white-space: pre-wrap;
    word-break: break-word;
    padding: 2px 4px 4px;
}

.lesson-ch1-note-delete {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    padding: 0;
    line-height: 1;
    font-size: 18px;
    color: var(--text-muted);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: color .12s, background .12s;
}

.lesson-ch1-note-delete:hover {
    color: var(--danger);
    background: var(--bg-hover);
}

.lesson-chapter[data-chapter="2"].expanded .lesson-chapter-body,
.lesson-chapter[data-chapter="3"].expanded .lesson-chapter-body {
    max-height: min(72vh, 1200px);
}

.lesson-chapter-body-inner--ch2 {
    max-height: min(68vh, 1100px);
}

.lesson-ch2-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(112px, 1fr));
    gap: 6px;
}

.lesson-ch2-tile {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-input);
    border: 1px solid var(--border);
    cursor: pointer;
}

.lesson-ch2-tile--add {
    cursor: pointer;
    border-style: dashed;
    border-color: var(--border);
    background: var(--bg-card);
}

.lesson-ch2-tile--add:hover {
    border-color: var(--accent);
    background: var(--bg-hover);
}

.lesson-ch2-add-photo {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    cursor: pointer;
    overflow: hidden;
}

.lesson-ch2-add-photo-text {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    text-align: center;
    padding: 8px;
    line-height: 1.3;
    pointer-events: none;
}

.lesson-ch2-tile--add:hover .lesson-ch2-add-photo-text {
    color: var(--accent);
}

.lesson-ch2-file {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    font-size: 0;
}

.lesson-ch2-tile img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.lesson-ch2-tile-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity .18s ease;
    pointer-events: none;
}

.lesson-ch2-tile:hover .lesson-ch2-tile-overlay {
    opacity: 1;
}

.lesson-ch2-expand-icon {
    font-size: 28px;
    line-height: 1;
    color: #fff;
    text-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
}

.lesson-ch2-delete {
    position: absolute;
    top: 4px;
    right: 4px;
    z-index: 2;
    width: 26px;
    height: 26px;
    padding: 0;
    margin: 0;
    font-size: 18px;
    line-height: 1;
    color: #fff;
    background: rgba(0, 0, 0, 0.55);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .12s;
}

.lesson-ch2-delete:hover {
    background: var(--danger);
}

.lesson-ch2-lightbox {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 10000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    box-sizing: border-box;
    background: rgba(0, 0, 0, 0.88);
}

.lesson-ch2-lightbox.is-open {
    display: flex;
}

.lesson-ch2-lightbox-inner {
    position: relative;
    max-width: min(96vw, 1600px);
    max-height: 96vh;
}

.lesson-ch2-lightbox-img {
    display: block;
    max-width: min(96vw, 1600px);
    max-height: 92vh;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.45);
}

.lesson-ch2-lightbox-close {
    position: absolute;
    top: -12px;
    right: -12px;
    z-index: 2;
    width: 40px;
    height: 40px;
    padding: 0;
    font-size: 26px;
    line-height: 1;
    color: var(--text-bright);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: background .12s, color .12s;
}

.lesson-ch2-lightbox-close:hover {
    background: var(--bg-hover);
    color: var(--danger);
}