/*
 * Febe ClassMaster — Classroom Creative Studio
 * Final visual system layer. Loaded after legacy styles on purpose.
 */

:root {
  --studio-canvas: #eee9de;
  --studio-canvas-deep: #e4ddcf;
  --studio-paper: #fffdf8;
  --studio-paper-warm: #faf4e8;
  --studio-ink: #17322d;
  --studio-ink-soft: #31544c;
  --studio-muted: #74827d;
  --studio-line: #d9d2c4;
  --studio-line-strong: #c8bca8;
  --studio-forest: #173f36;
  --studio-forest-2: #205649;
  --studio-coral: #f05a42;
  --studio-coral-dark: #bd3929;
  --studio-gold: #f5b942;
  --studio-sky: #43a9c5;
  --studio-success: #2f8f67;
  --studio-danger: #cf4037;
  --studio-radius-xl: 24px;
  --studio-radius-lg: 18px;
  --studio-radius-md: 13px;
  --studio-radius-sm: 9px;
  --studio-shadow: 0 16px 44px rgba(34, 53, 46, .08);
  --studio-shadow-small: 0 6px 18px rgba(34, 53, 46, .08);

  /* Legacy token bridge */
  --bg-space: var(--studio-canvas);
  --bg-surface: var(--studio-paper);
  --bg-surface-hover: #fff;
  --border: var(--studio-line);
  --border-neon: var(--studio-line);
  --border-neon-hover: var(--studio-coral);
  --primary-neon: var(--studio-coral);
  --primary-neon-hover: var(--studio-coral-dark);
  --secondary-neon: var(--studio-success);
  --accent-neon: var(--studio-gold);
  --text-main: var(--studio-ink);
  --text-muted: var(--studio-muted);
  --sidebar-width: 264px;
  --radius-lg: var(--studio-radius-xl);
  --radius-md: var(--studio-radius-md);
  --radius-sm: var(--studio-radius-sm);
  --transition-elastic: all .22s cubic-bezier(.2,.8,.2,1);
  --transition-smooth: all .18s ease;
  --glow-primary: 0 8px 18px rgba(240,90,66,.18);
  --glow-secondary: 0 8px 18px rgba(47,143,103,.16);
  --shadow-dark: var(--studio-shadow-small);
  --shadow-paper: var(--studio-shadow);
}

html { background: var(--studio-canvas); }

body {
  font-family: 'Noto Sans SC', 'Outfit', sans-serif;
  background: var(--studio-canvas);
  color: var(--studio-ink);
}

button, input, select, textarea { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

/* ── Application shell ───────────────────────────────────────────── */

.sidebar {
  width: var(--sidebar-width);
  padding: 22px 14px 18px;
  background: var(--studio-forest);
  color: #fff9e9;
  border: 0;
  border-right: 1px solid rgba(255,255,255,.08);
  box-shadow: 12px 0 34px rgba(16,48,40,.12);
  backdrop-filter: none;
}

.brand {
  margin: 0 0 26px;
  padding: 0 10px;
}

.brand-logo-container { gap: 12px; }
.brand-logo {
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 14px;
  background: var(--studio-coral);
  color: #fff;
  box-shadow: 0 5px 0 #9f3023;
  transform: rotate(-2deg);
}
.brand-name {
  color: #fffdf7;
  font-size: 18px;
  line-height: 1.1;
  letter-spacing: -.4px;
}
.brand-tag {
  margin-top: 5px;
  color: #d6c79f;
  font-family: 'JetBrains Mono', monospace;
  font-size: 8px;
  letter-spacing: 1.15px;
}

.nav-menu { padding: 0; }
.nav-section-label {
  padding: 0 14px 9px;
  color: #9fb7ad;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1.8px;
}
.nav-item {
  min-height: 52px;
  margin: 4px 0;
  padding: 11px 12px;
  gap: 11px;
  color: #c6d5cf;
  border: 1px solid transparent;
  border-radius: 13px;
  font-weight: 700;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}
.nav-item:hover {
  background: rgba(255,255,255,.07);
  color: #fff;
  transform: translateX(3px);
}
.nav-item.active {
  background: #fff8e9;
  color: var(--studio-forest);
  border-color: #fff8e9;
  box-shadow: 0 7px 18px rgba(0,0,0,.14);
}
.nav-item.active::before {
  left: -14px;
  top: 12px;
  width: 5px;
  height: 28px;
  background: var(--studio-coral);
}
.nav-icon {
  width: 31px;
  height: 31px;
  flex: 0 0 31px;
  border-radius: 9px;
  color: #f2cf84;
  background: rgba(255,255,255,.07);
  font-size: 15px;
}
.nav-item.active .nav-icon {
  background: #f7dec0;
  color: var(--studio-coral-dark);
}
.nav-text { font-size: 13px; }

.sidebar-footer {
  padding: 16px 4px 0;
  border-color: rgba(255,255,255,.1);
}
.user-profile {
  margin-bottom: 10px;
  padding: 11px;
  background: rgba(255,255,255,.07);
  border-color: rgba(255,255,255,.1);
  border-radius: 13px;
}
.user-avatar {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--studio-gold);
  color: var(--studio-forest);
  box-shadow: none;
}
.user-name { color: #fffdf7; }
.user-role { color: #b7c9c1; }
.logout-btn {
  padding: 10px;
  color: #ffc7bb;
  background: transparent;
  border-color: rgba(255,199,187,.2);
  border-radius: 10px;
}
.logout-btn:hover {
  color: #fff;
  background: var(--studio-danger);
  box-shadow: none;
  transform: none;
}

.main-content { background: transparent; }
.header {
  height: 78px;
  padding: 0 32px;
  background: rgba(255,253,248,.88);
  border-bottom: 1px solid var(--studio-line);
  backdrop-filter: blur(14px);
}
.header-title-area { gap: 16px; }
.header h1 {
  max-width: min(60vw, 860px);
  color: var(--studio-ink);
  font-size: clamp(18px, 1.45vw, 24px);
  letter-spacing: -.55px;
}
.header-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  color: var(--studio-ink-soft);
  background: #e7efe8;
  border: 1px solid #cbdacf;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
  white-space: nowrap;
}
.header-status i { color: var(--studio-success); font-size: 7px; }
.org-selector {
  min-width: 170px;
  padding: 9px 34px 9px 13px;
  color: var(--studio-ink);
  background: var(--studio-paper);
  border: 1px solid var(--studio-line-strong);
  border-radius: 11px;
  box-shadow: 0 2px 0 rgba(23,50,45,.07);
}
.org-selector:hover, .org-selector:focus {
  border-color: var(--studio-forest-2);
  box-shadow: 0 0 0 3px rgba(32,86,73,.1);
}
#org-name-display { color: var(--studio-forest-2) !important; }

.app-workspace {
  grid-template-columns: 370px minmax(0,1fr);
  gap: 18px;
  height: calc(100vh - 78px);
  padding: 20px 26px 26px;
}
.app-workspace:has(#classroom-projection-settings.active) {
  grid-template-columns: 370px minmax(0,1fr);
  gap: 18px;
  height: calc(100vh - 78px);
  padding: 20px 26px 26px;
  background: transparent;
}
body:has(#classroom-projection-settings.active) { background: var(--studio-canvas); }
.app-controls, .app-display { padding: 0 4px 0 0; gap: 14px; }
.app-controls::-webkit-scrollbar-thumb,
.app-display::-webkit-scrollbar-thumb { background: #b7ad9e; }

/* ── Shared surfaces and controls ────────────────────────────────── */

.card {
  padding: 22px;
  background: var(--studio-paper);
  border: 1px solid var(--studio-line);
  border-radius: var(--studio-radius-xl);
  box-shadow: var(--studio-shadow-small);
  backdrop-filter: none;
  transition: border-color .18s ease, box-shadow .18s ease;
}
.card::before { display: none; }
.card:hover {
  border-color: var(--studio-line-strong);
  transform: none;
  box-shadow: var(--studio-shadow);
}
.card-title {
  margin-bottom: 18px;
  padding-bottom: 13px;
  color: var(--studio-ink);
  border-color: var(--studio-line);
  font-size: 15px;
}

.form-label {
  margin-bottom: 7px;
  color: var(--studio-muted);
  font-size: 10.5px;
  letter-spacing: .7px;
}
.form-select, .form-input, input[type='number'], input[type='text'] {
  min-height: 44px;
  padding: 10px 13px;
  color: var(--studio-ink);
  background: #fff;
  border: 1px solid var(--studio-line-strong);
  border-radius: 11px;
  box-shadow: 0 2px 0 rgba(23,50,45,.04);
}
.form-select:hover, .form-input:hover { border-color: #91a49d; }
.form-select:focus, .form-input:focus,
input[type='number']:focus, input[type='text']:focus {
  border-color: var(--studio-forest-2);
  box-shadow: 0 0 0 3px rgba(32,86,73,.1);
}

.btn-primary, .btn-secondary, .btn-control,
.curriculum-tab-btn, .mode-btn, .speed-btn {
  border-radius: 11px;
  font-weight: 850;
  transition: transform .14s ease, box-shadow .14s ease, background .14s ease;
}
.btn-primary {
  color: #fff;
  background: var(--studio-coral);
  border: 1px solid var(--studio-coral-dark);
  box-shadow: 0 4px 0 var(--studio-coral-dark);
}
.btn-primary:hover {
  background: #fa654c;
  box-shadow: 0 5px 0 var(--studio-coral-dark);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--studio-coral-dark); }
.btn-secondary {
  color: var(--studio-ink);
  background: #fff;
  border: 1px solid var(--studio-line-strong);
  box-shadow: 0 3px 0 #c9c0b2;
}
.btn-secondary:hover { color: var(--studio-forest); background: var(--studio-paper-warm); border-color: #a89e8d; }

.chip-container {
  padding: 12px;
  background: var(--studio-paper-warm);
  border: 1px dashed var(--studio-line-strong);
  border-radius: 13px;
}
.chip {
  padding: 9px 13px;
  color: var(--studio-ink-soft);
  background: #fff;
  border-color: var(--studio-line);
  border-radius: 10px;
  box-shadow: 0 2px 0 rgba(23,50,45,.07);
}
.chip:hover { color: var(--studio-coral-dark); border-color: var(--studio-coral); transform: translateY(-1px); }
.chip.active {
  color: #fff !important;
  background: var(--studio-forest-2) !important;
  border-color: var(--studio-forest) !important;
  box-shadow: 0 3px 0 var(--studio-forest) !important;
}
.accordion { background: var(--studio-paper-warm); border-color: var(--studio-line); }
.accordion-header { color: var(--studio-forest-2); background: #f6efe2; }

/* ── Classroom presentation setup ────────────────────────────────── */

#classroom-projection-settings > .card:first-child {
  border: 1px solid var(--studio-line);
  border-top: 4px solid var(--studio-gold);
}
#classroom-projection-settings.active {
  display: flex !important;
  flex-direction: column;
  gap: 14px;
  padding: 0 4px 0 0;
  overflow-y: auto;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}
#classroom-projection-settings > .card {
  padding: 20px;
  background: var(--studio-paper);
  border: 1px solid var(--studio-line);
  border-radius: 20px;
  box-shadow: var(--studio-shadow-small);
}
#classroom-projection-settings > .card:first-child,
#classroom-projection-settings > .card:last-child { border-radius: 20px; }
#classroom-projection-settings > #global-question-config { border-top: 4px solid var(--studio-forest-2); }
#classroom-projection-settings > .card::before {
  color: #fff;
  background: var(--studio-forest-2);
}
.curriculum-switcher-grid { gap: 8px; }
.curriculum-tab-btn {
  min-height: 48px;
  color: var(--studio-ink-soft);
  background: #fff;
  border: 1px solid var(--studio-line);
}
.curriculum-tab-btn:hover { border-color: var(--studio-forest-2); transform: none; }
.curriculum-tab-btn.active {
  color: #fff;
  background: var(--studio-forest-2);
  border-color: var(--studio-forest);
  box-shadow: 0 4px 0 var(--studio-forest);
}
.mode-chips-grid { gap: 8px; }
.mode-btn, .speed-btn {
  background: #fff;
  border-color: var(--studio-line);
  color: var(--studio-ink-soft);
}
.mode-btn.active, .speed-btn.active {
  background: #f7dfb3;
  border-color: #d89a22;
  color: #573c0c;
  box-shadow: 0 3px 0 #d89a22;
}
.launch-big-btn { min-height: 58px; font-size: 15px; }

#classroom-projection-display:not(.active) { display: none !important; }
#classroom-projection-display.active { display: flex; }
#classroom-projection-display.active:has(> .preview-action-card:only-child) {
  padding: 0;
  background: var(--studio-forest);
  border: 1px solid #102e27;
  border-radius: 24px;
  box-shadow: 0 14px 0 #102e27, 0 24px 44px rgba(23,63,54,.16);
}
.preview-action-card {
  min-height: 100%;
  background: var(--studio-forest) !important;
  border: 1px solid #102e27 !important;
  box-shadow: 0 14px 0 #102e27, 0 24px 44px rgba(23,63,54,.16) !important;
}
#classroom-projection-display:has(> .preview-action-card:only-child) .preview-action-card {
  padding: clamp(28px,4vw,60px) !important;
  background: var(--studio-forest) !important;
}
.preview-action-card .card-title { color: #fff9e9; border-color: rgba(255,255,255,.12); }
.projection-hub-banner {
  min-height: 230px;
  padding: 34px;
  background: #fff5df;
  border: 0;
  border-radius: 22px;
  box-shadow: none;
}
.projection-hub-banner::after { display: none; }
.projection-hub-banner:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(0,0,0,.12); }
.hub-icon-glow {
  color: #fff;
  background: var(--studio-coral);
  border-radius: 18px;
  box-shadow: 0 7px 0 var(--studio-coral-dark);
}
.hub-info h3 { color: var(--studio-forest); }
.hub-info p { color: #79684e; }
.hub-action-badge {
  color: #fff;
  background: var(--studio-forest);
  border-radius: 12px;
  box-shadow: 0 4px 0 #0d2923;
}
.shortcuts-guide-panel {
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.14);
  border-radius: 15px;
}
.shortcuts-title, .shortcut-item { color: #c9d8d2; }
.shortcut-item kbd {
  color: var(--studio-forest);
  background: var(--studio-gold);
  border: 0;
  box-shadow: 0 2px 0 #bd8420;
}

/* ── Interactive abacus studio ───────────────────────────────────── */

.abacus-lab {
  --lab-ink: var(--studio-forest);
  min-height: calc(100vh - 124px);
  padding: 22px !important;
  color: var(--studio-ink) !important;
  background: var(--studio-paper) !important;
  border: 1px solid var(--studio-line) !important;
  box-shadow: var(--studio-shadow) !important;
}
.app-workspace.full-width-workspace:has(#interactive-abacus-display.active) {
  padding: 20px 26px 26px;
  background: transparent;
}
.abacus-lab .abacus-lab-header {
  min-height: 64px;
  padding: 0 0 16px !important;
  color: var(--studio-ink) !important;
  border-color: var(--studio-line) !important;
  background: transparent !important;
}
.abacus-lab .abacus-lab-identity span:last-child {
  color: var(--studio-coral-dark) !important;
  background: #ffe0d8 !important;
}
.abacus-lab .abacus-lab-identity > span:first-child { color: var(--studio-ink) !important; }
.abacus-lab .abacus-lab-rods > span { color: var(--studio-muted) !important; }
.abacus-lab .sandbox-rods-group { background: #eee6d8 !important; border-color: var(--studio-line) !important; }
.abacus-lab .sandbox-rod-chip { color: var(--studio-muted) !important; }
.abacus-lab .sandbox-rod-chip.active {
  color: #fff !important;
  background: var(--studio-forest-2) !important;
  box-shadow: 0 3px 0 var(--studio-forest) !important;
}
.abacus-lab .sandbox-toolbar { grid-template-columns: minmax(240px,.55fr) minmax(520px,1.45fr); }
.abacus-lab .sandbox-readout-card {
  background: var(--studio-forest) !important;
  border-color: #102e27 !important;
  box-shadow: 0 5px 0 #102e27 !important;
}
.abacus-lab .readout-label { color: #b9cbc3 !important; }
.abacus-lab .readout-number { color: var(--studio-gold) !important; text-shadow: none !important; }
.abacus-lab .sandbox-setter-card {
  background: var(--studio-paper-warm) !important;
  border-color: var(--studio-line) !important;
}
.abacus-lab #sandbox-direct-input { background: #fff !important; color: var(--studio-ink) !important; border-color: var(--studio-line-strong) !important; }
.abacus-lab #sandbox-direct-input::placeholder { color: #9a958c !important; }
.abacus-lab .sandbox-setter-card .btn-primary { color: #fff !important; background: var(--studio-coral) !important; box-shadow: 0 5px 0 var(--studio-coral-dark) !important; }
.abacus-lab .sandbox-setter-card .btn-secondary { color: var(--studio-ink) !important; background: #fff !important; border-color: var(--studio-line-strong) !important; box-shadow: 0 4px 0 #c9c0b2 !important; }
.abacus-lab .sandbox-abacus-viewport {
  background: #f3ecdf !important;
  border-color: var(--studio-line-strong) !important;
}
.abacus-lab .sandbox-abacus-viewport::before { color: #998f80 !important; }

/* ── Math teaching tools ─────────────────────────────────────────── */

#math-tools-display > .card {
  min-height: calc(100vh - 124px) !important;
  border-top: 5px solid var(--studio-sky);
}
#math-tools-display > .card > .card-title > div:first-child > span:last-child {
  color: var(--studio-success) !important;
  background: #dceae4 !important;
}
.math-tool-tabs-group {
  gap: 5px;
  padding: 5px;
  background: #ece6da;
  border: 1px solid var(--studio-line);
  border-radius: 13px;
}
.math-tool-tab {
  min-height: 38px;
  padding: 8px 12px;
  color: var(--studio-muted);
  background: transparent;
  border-radius: 9px;
}
.math-tool-tab:hover { color: var(--studio-ink); background: rgba(255,255,255,.55); transform: none; }
.math-tool-tab.active {
  color: #fff;
  background: var(--studio-forest-2);
  box-shadow: 0 3px 0 var(--studio-forest);
}
.math-tool-card {
  padding: 22px;
  background: var(--studio-paper-warm);
  border: 1px solid var(--studio-line);
  border-radius: 18px;
  box-shadow: none;
}
.math-tool-header { border-color: var(--studio-line); }
.math-tool-header h3 { color: var(--studio-ink); }
.math-tool-tag, .fraction-result-badge {
  color: var(--studio-forest-2);
  background: #dceae4;
  border-color: #bad3c8;
}
.tool-controls-row {
  padding: 14px;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 14px;
}
.number-line-stage, .column-stage-container, .fraction-models-grid,
.utility-subcard {
  background-color: #fff;
  border-color: var(--studio-line);
  border-radius: 17px;
}
.nl-equation-banner, .col-ans { color: var(--studio-coral-dark); }
.nl-target-val { color: var(--studio-forest-2); }
.nl-line-axis { background: var(--studio-forest); }
.nl-tick.start-tick .nl-mark, .nl-tick.end-tick .nl-mark { background: var(--studio-coral); }
.fraction-bar-seg.active { background: var(--studio-coral) !important; }
.fraction-card, .column-explanation-card { border-color: var(--studio-line); background: var(--studio-paper-warm); }

/* ── Custom training matrix ──────────────────────────────────────── */

#custom-settings-display > div { max-width: 1120px !important; }
#custom-settings-display .card {
  padding: 28px;
  border-top: 5px solid var(--studio-gold);
}
#custom-settings-display h4 {
  padding-left: 12px;
  color: var(--studio-forest) !important;
  border-left: 4px solid var(--studio-coral);
}
#custom-settings-display .chip-container {
  min-height: 62px;
  align-items: center;
}

/* ── Game lobby frame ────────────────────────────────────────────── */

#classroom-games-display { height: 100%; }
#game-workspace-container { min-height: 100%; }
.arcade-lobby-wrapper {
  min-height: calc(100vh - 124px);
  padding: 24px;
  background: var(--studio-paper);
  border: 1px solid var(--studio-line);
  border-radius: 24px;
  box-shadow: var(--studio-shadow);
}
.arcade-lobby-header { padding-bottom: 20px; border-color: var(--studio-line); }
.arcade-neon-badge {
  color: #fff;
  background: var(--studio-coral);
  border: 0;
  box-shadow: 0 4px 0 var(--studio-coral-dark);
}
.arcade-main-title { color: var(--studio-ink); text-shadow: none; }
.arcade-sub-title { color: var(--studio-coral-dark); }
.arcade-desc { color: var(--studio-muted); }
.btn-arcade-fullscreen {
  color: #fff;
  background: var(--studio-forest);
  border-color: #102e27;
  box-shadow: 0 4px 0 #102e27;
}
.btn-arcade-fullscreen:hover { background: var(--studio-forest-2); transform: translateY(-1px); }
.arcade-cabinet-grid { gap: 16px; }
.arcade-cabinet-card {
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 18px;
  box-shadow: 0 5px 0 #d3cabc;
}
.arcade-cabinet-card:hover {
  border-color: var(--studio-coral);
  transform: translateY(-4px);
  box-shadow: 0 9px 0 #d3cabc, 0 16px 28px rgba(34,53,46,.1);
}
.btn-cabinet-start {
  color: #fff;
  background: var(--studio-forest-2);
  border-color: var(--studio-forest);
  box-shadow: 0 4px 0 var(--studio-forest);
}
.btn-cabinet-start:hover { background: var(--studio-coral); border-color: var(--studio-coral-dark); }
.btn-lobby-back {
  color: var(--studio-ink);
  background: #fff;
  border-color: var(--studio-line-strong);
  box-shadow: 0 3px 0 #c9c0b2;
}
.btn-lobby-back:hover { color: #fff; background: var(--studio-forest-2); border-color: var(--studio-forest); transform: none; }

/* Active games retain their own worlds; shared chrome stays consistent. */
.game-stage-card { border-radius: 24px; }
.game-header-bar { border-radius: 18px; }
.game-nav-tabs-group { background: rgba(255,255,255,.72); border-radius: 12px; }
.game-nav-tab { border-radius: 9px; }
.game-nav-tab.active { background: var(--studio-forest-2); color: #fff; box-shadow: 0 3px 0 var(--studio-forest); }
.game-score-badge { border-radius: 11px; }

/* ── Overlays, notices and focus ─────────────────────────────────── */

.classroom-overlay {
  padding: 26px 34px !important;
  color: #fffdf7 !important;
  background: var(--studio-forest) !important;
}
.classroom-header {
  min-height: 66px !important;
  color: #bdd0c8 !important;
  border-color: rgba(255,255,255,.14) !important;
}
#class-overlay-badge {
  color: #fff !important;
  background: var(--studio-coral) !important;
  border-radius: 9px !important;
  box-shadow: 0 3px 0 var(--studio-coral-dark);
}
#class-overlay-progress-num { color: #b7c9c1 !important; }
.classroom-close-btn {
  color: var(--studio-forest) !important;
  background: #fff8e9 !important;
  border-color: #d2c5aa !important;
  box-shadow: 0 4px 0 #b9aa8c !important;
}
.classroom-content::before {
  color: #89a69a !important;
  content: 'FEBE CLASSROOM · LIVE' !important;
}
.classroom-number-display {
  padding: 40px 70px !important;
  color: var(--studio-forest) !important;
  background: #fff9eb !important;
  border: 2px solid #ddcda9 !important;
  border-radius: 32px !important;
  text-shadow: none !important;
  box-shadow: 0 12px 0 #c8b58e, 0 34px 70px rgba(0,0,0,.22) !important;
}
.classroom-progress-bar-container {
  background: rgba(255,255,255,.1) !important;
  border-color: rgba(255,255,255,.22) !important;
}
.classroom-progress-bar {
  background: var(--studio-coral) !important;
  box-shadow: none !important;
}
.classroom-footer { border-color: rgba(255,255,255,.13) !important; }
.classroom-footer .btn-control {
  color: var(--studio-forest) !important;
  background: #fff8e9 !important;
  border-color: #d2c5aa !important;
  box-shadow: 0 5px 0 #b9aa8c !important;
}
.classroom-footer .btn-control.active-play {
  color: #fff !important;
  background: var(--studio-coral) !important;
  border-color: var(--studio-coral-dark) !important;
  box-shadow: 0 5px 0 var(--studio-coral-dark) !important;
}
.classroom-footer #class-btn-reveal {
  color: var(--studio-forest) !important;
  background: var(--studio-gold) !important;
  border-color: #c88b1d !important;
  box-shadow: 0 5px 0 #a66f10 !important;
}
.review-item {
  color: var(--studio-ink) !important;
  background: #fff9eb !important;
  border-color: #ddcda9 !important;
  box-shadow: 0 5px 0 #c8b58e;
}
.review-item:hover { background: #fff !important; box-shadow: 0 7px 0 #c8b58e !important; }
.review-header { color: var(--studio-muted) !important; }
.review-nums { color: var(--studio-ink) !important; }
.review-ans { color: var(--studio-coral-dark) !important; border-color: var(--studio-line) !important; text-shadow: none !important; }

.modal-overlay { background: rgba(16,41,35,.72); backdrop-filter: blur(7px); }
.modal {
  color: var(--studio-ink);
  background: var(--studio-paper);
  border: 1px solid var(--studio-line);
  border-radius: 22px;
  box-shadow: 0 30px 90px rgba(0,0,0,.24);
}
.modal::before { background: var(--studio-coral); }
#login-overlay .modal > div:first-child > div {
  color: #fff !important;
  background: var(--studio-coral) !important;
  border-color: var(--studio-coral-dark) !important;
  border-radius: 17px !important;
  box-shadow: 0 5px 0 var(--studio-coral-dark);
}
.toast {
  color: #fff;
  background: var(--studio-forest);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 12px;
  box-shadow: 0 14px 34px rgba(0,0,0,.18);
}
.toast.success { background: var(--studio-success); }
.toast.error { background: var(--studio-danger); }

:focus-visible {
  outline: 3px solid rgba(67,169,197,.45);
  outline-offset: 2px;
}

/* ── Responsive classroom displays ───────────────────────────────── */

@media (max-width: 1280px) {
  :root { --sidebar-width: 232px; }
  .nav-text { font-size: 12px; }
  .header-status { display: none; }
  .app-workspace,
  .app-workspace:has(#classroom-projection-settings.active) { grid-template-columns: 330px minmax(0,1fr); padding-inline: 18px; }
  .projection-hub-banner { padding: 24px; }
  .abacus-lab .sandbox-toolbar { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .sidebar { position: fixed; left: -280px; width: 260px; transition: left .22s ease; }
  .sidebar.open { left: 0; }
  .mobile-menu-btn { display: inline-flex !important; }
  .header { padding: 0 18px; }
  .header h1 { max-width: 72vw; font-size: 17px; }
  .app-workspace, .app-workspace.full-width-workspace {
    grid-template-columns: 1fr;
    height: calc(100vh - 78px);
    padding: 14px;
    overflow-y: auto;
  }
  .app-workspace:has(#classroom-projection-settings.active) {
    grid-template-columns: 1fr;
    height: calc(100vh - 78px);
    padding: 14px;
    overflow-y: auto;
  }
  .app-controls, .app-display { height: auto; overflow: visible; }
  #classroom-projection-display.active { min-height: 620px; }
  .projection-hub-banner { flex-direction: column; align-items: flex-start; }
  .shortcuts-grid { grid-template-columns: 1fr 1fr; }
  .math-tool-tabs-group { width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .math-tool-tab { white-space: nowrap; }
  .abacus-lab .sandbox-setter-card { grid-template-columns: 1fr; }
  .arcade-cabinet-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 600px) {
  .header #org-info { display: none !important; }
  .card { padding: 16px; border-radius: 17px; }
  .app-workspace { padding: 10px; }
  .shortcuts-grid, .arcade-cabinet-grid { grid-template-columns: 1fr; }
  .tool-controls-row { align-items: stretch; }
  .tool-controls-row .form-input, .tool-controls-row .form-select { width: 100% !important; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}