:root {
  --bg: #07111f;
  --bg-2: #0f172a;
  --panel: rgba(15, 23, 42, 0.92);
  --panel-soft: rgba(30, 41, 59, 0.92);
  --panel-elevated: rgba(15, 23, 42, 0.98);
  --surface: rgba(15, 23, 42, 0.64);
  --primary: #4ade80;
  --primary-dark: #16a34a;
  --accent: #fbbf24;
  --accent-soft: #fde68a;
  --danger: #f87171;
  --text: #edf6ff;
  --muted: #c7d7ec;
  --muted-strong: #dce9f9;
  --line: rgba(148, 163, 184, 0.18);
  --shadow: rgba(2, 6, 23, 0.45);
  --gold: #f9c74f;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", "Noto Sans Greek", "Arial Unicode MS", "DejaVu Sans", sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.class-landing {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(1400px 700px at 50% -10%, rgba(74, 222, 128, 0.12), transparent), rgba(7, 11, 23, 0.94);
  backdrop-filter: blur(8px);
}

.class-landing.hidden {
  display: none;
}

.class-landing-card {
  width: min(760px, 92vw);
  background: rgba(17, 24, 39, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 24px;
  box-shadow: 0 28px 70px rgba(2, 6, 23, 0.6);
  padding: 28px 24px;
  text-align: center;
}

.class-landing-card h2 {
  margin: 6px 0 10px;
  font-size: clamp(2rem, 4vw, 3rem);
}

.landing-sub {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 1rem;
}

.grade-choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.class-choice-btn {
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.96), rgba(15, 23, 42, 1));
  color: var(--text);
  border-radius: 16px;
  padding: 22px 18px;
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.class-choice-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(148, 163, 184, 0.4);
  box-shadow: 0 14px 28px rgba(14, 116, 144, 0.12);
}

.class-choice-all {
  grid-column: 1 / -1;
  background: linear-gradient(180deg, rgba(14, 116, 144, 0.9), rgba(8, 74, 92, 1));
  border-color: rgba(45, 212, 191, 0.5);
}

.landing-credit {
  margin-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(148, 163, 184, 0.85);
}

.landing-credit strong {
  color: var(--text);
}

.site-credit {
  text-align: center;
  padding: 18px 16px 26px;
  margin-top: 20px;
  font-size: 0.8rem;
  color: rgba(148, 163, 184, 0.7);
  border-top: 1px solid rgba(148, 163, 184, 0.12);
}

.site-credit strong {
  color: rgba(203, 213, 225, 0.95);
}

.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  /* Χωρίς align/justify center εδώ: το κεντράρισμα γίνεται με margin:auto στην .auth-card,
     ώστε όταν η κάρτα είναι ψηλότερη από την οθόνη (π.χ. φόρμα εγγραφής σε μικρά κινητά)
     να μη «κόβεται» το πάνω μέρος και να παραμένει προσβάσιμο με κύλιση. */
  padding: 20px;
  background: radial-gradient(1200px 600px at 50% -10%, rgba(45, 212, 191, 0.12), transparent), rgba(9, 14, 26, 0.92);
  backdrop-filter: blur(8px);
  overflow: auto;
}

.auth-overlay.hidden {
  display: none;
}

.auth-card {
  width: min(420px, 94vw);
  margin: auto; /* κεντράρισμα scroll-safe: αν δεν χωρά, στοιχίζεται στην κορυφή αντί να κόβεται */
  background: rgba(17, 24, 39, 0.98);
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(2, 6, 23, 0.6);
  padding: 26px 24px;
  text-align: center;
}

.auth-card h2 {
  margin: 2px 0 4px;
  color: var(--text);
  font-size: 1.7rem;
}

.auth-sub {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.9rem;
}

.auth-roles {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}

.auth-role-btn {
  flex: 1;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(15, 23, 42, 0.6);
  color: var(--muted);
  font-weight: 800;
  cursor: pointer;
}

.auth-role-btn.active {
  background: var(--accent);
  color: #1b2d4a;
  border-color: var(--accent);
}

.auth-form,
.auth-subform {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.auth-form.hidden,
.auth-subform.hidden {
  display: none;
}

.auth-form label,
.auth-subform label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 700;
}

.secret-input {
  display: flex;
  gap: 8px;
}

.secret-input input {
  min-width: 0;
  flex: 1;
}

.secret-toggle {
  flex: 0 0 auto;
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 10px;
  padding: 8px 10px;
  background: rgba(30, 41, 59, 0.88);
  color: var(--muted-strong);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
}

.secret-toggle:hover,
.secret-toggle:focus-visible {
  border-color: var(--accent);
  color: var(--text);
  outline: 3px solid rgba(251, 191, 36, 0.14);
}

.auth-form input,
.auth-form select,
.auth-subform input {
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(15, 23, 42, 0.7);
  color: var(--text);
  font-size: 1rem;
}

.auth-form input:focus,
.auth-form select:focus,
.auth-subform input:focus {
  outline: none;
  border-color: var(--accent);
}

.answer-meta {
  margin: 0 0 10px;
}

.answer-requirement {
  margin: 0;
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.26);
  color: #fef3c7;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  font-weight: 700;
}

.auth-switch {
  display: flex;
  gap: 8px;
  margin-bottom: 4px;
}

.auth-switch-btn {
  flex: 1;
  padding: 8px;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  cursor: pointer;
}

.auth-switch-btn.active {
  background: rgba(148, 163, 184, 0.16);
  color: var(--text);
}

.auth-msg {
  margin: 4px 0 0;
  color: #fca5a5;
  font-size: 0.85rem;
  min-height: 1em;
}

.form-msg {
  margin: 4px 0 0;
  font-size: 0.85rem;
  min-height: 1em;
}

.form-msg.error {
  color: #fca5a5;
}

.form-msg.success {
  color: #86efac;
}

.auth-demo {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
}

.auth-demo.hidden {
  display: none;
}

.auth-demo-label {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 10px;
}

.auth-demo-btns {
  display: flex;
  gap: 8px;
}

.auth-demo-btns .secondary-btn {
  flex: 1;
}

.question-timer {
  position: sticky;
  top: 8px;
  z-index: 20;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  margin: -8px auto 18px;
  width: fit-content;
  padding: 10px 22px;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.96);
  border: 2px solid var(--accent);
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(6px);
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.2s ease;
}

.question-timer-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.question-timer strong {
  font-size: 1.9rem;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.question-timer-unit {
  font-size: 0.8rem;
  color: var(--muted);
}

.question-timer.low {
  border-color: var(--danger);
  background: rgba(69, 10, 10, 0.96);
  animation: question-timer-pulse 1s ease-in-out infinite;
}

.question-timer.low strong {
  color: #fecaca;
}

@keyframes question-timer-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

@media (max-width: 640px) {
  .question-timer {
    padding: 8px 16px;
    gap: 6px;
  }
  .question-timer strong {
    font-size: 1.6rem;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Inter", Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top, rgba(59, 130, 246, 0.2), transparent 25%),
    radial-gradient(circle at right, rgba(45, 212, 191, 0.12), transparent 25%),
    linear-gradient(135deg, #020817 0%, #0b1324 30%, #111827 100%);
  color: var(--text);
}

.app {
  width: min(980px, 94vw);
  margin: 0 auto;
  padding: 28px 0 52px;
}

.tab-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
  padding: 12px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.82));
  border: 1px solid var(--line);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.42);
  backdrop-filter: blur(10px);
}

.tab-btn {
  flex: 1 1 auto;
  min-width: 102px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(15, 23, 42, 0.5);
  color: var(--muted);
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all 0.18s ease;
}

.tab-btn:hover {
  color: var(--text);
  border-color: rgba(148, 163, 184, 0.45);
  transform: translateY(-1px);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--accent), #f59e0b);
  color: #1d2537;
  border-color: rgba(251, 191, 36, 0.7);
  box-shadow: 0 10px 22px rgba(251, 191, 36, 0.2);
}

.tab-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 14px;
}

.tab-panel.hidden {
  display: none;
}

.tab-panel > section {
  border-radius: 16px !important;
}

body[data-unit="trigonometry"] .tab-btn.active {
  background: #a855f7;
  border-color: #a855f7;
  color: #f8f3ff;
}

body[data-unit="circle"] .tab-btn.active {
  background: #2dd4bf;
  border-color: #2dd4bf;
  color: #08222c;
}

body[data-unit="vectors"] .tab-btn.active {
  background: #38bdf8;
  border-color: #38bdf8;
  color: #07293b;
}

body[data-unit="roots"] .topbar,
body[data-unit="roots"] .tracker-panel,
body[data-unit="roots"] .scoreboard,
body[data-unit="roots"] .mode-panel,
body[data-unit="roots"] .game-card,
body[data-unit="roots"] .history-panel,
body[data-unit="roots"] .teacher-panel,
body[data-unit="roots"] .rules-panel {
  background: rgba(17, 24, 39, 0.94);
  border-color: rgba(34, 197, 94, 0.2);
}

body[data-unit="trigonometry"] .topbar,
body[data-unit="trigonometry"] .tracker-panel,
body[data-unit="trigonometry"] .scoreboard,
body[data-unit="trigonometry"] .mode-panel,
body[data-unit="trigonometry"] .game-card,
body[data-unit="trigonometry"] .history-panel,
body[data-unit="trigonometry"] .teacher-panel,
body[data-unit="trigonometry"] .rules-panel {
  background: rgba(28, 19, 43, 0.96);
  border-color: rgba(168, 85, 247, 0.28);
  box-shadow: 0 18px 42px rgba(91, 33, 182, 0.18);
}

body[data-unit="circle"] .topbar,
body[data-unit="circle"] .tracker-panel,
body[data-unit="circle"] .scoreboard,
body[data-unit="circle"] .mode-panel,
body[data-unit="circle"] .game-card,
body[data-unit="circle"] .history-panel,
body[data-unit="circle"] .teacher-panel,
body[data-unit="circle"] .rules-panel {
  background: rgba(12, 34, 44, 0.96);
  border-color: rgba(45, 212, 191, 0.28);
  box-shadow: 0 18px 42px rgba(13, 148, 136, 0.18);
}

body[data-unit="vectors"] .topbar,
body[data-unit="vectors"] .tracker-panel,
body[data-unit="vectors"] .scoreboard,
body[data-unit="vectors"] .mode-panel,
body[data-unit="vectors"] .game-card,
body[data-unit="vectors"] .history-panel,
body[data-unit="vectors"] .teacher-panel,
body[data-unit="vectors"] .rules-panel {
  background: rgba(10, 28, 44, 0.96);
  border-color: rgba(56, 189, 248, 0.28);
  box-shadow: 0 18px 42px rgba(2, 132, 199, 0.18);
}

.topbar,
.tracker-panel,
.scoreboard,
.mode-panel,
.game-card,
.history-panel {
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.96), rgba(15, 23, 42, 0.9));
  border: 1px solid var(--line);
  box-shadow: 0 18px 42px var(--shadow);
}

.topbar {
  border-radius: 20px 20px 0 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 26px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.unit-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 700;
  background: rgba(34, 197, 94, 0.14);
  border: 1px solid rgba(34, 197, 94, 0.45);
  color: #d9ffe6;
}

body[data-unit="trigonometry"] .unit-badge {
  background: rgba(168, 85, 247, 0.14);
  border-color: rgba(168, 85, 247, 0.45);
  color: #f3e8ff;
}

body[data-unit="circle"] .unit-badge {
  background: rgba(45, 212, 191, 0.14);
  border-color: rgba(45, 212, 191, 0.45);
  color: #d5fbf3;
}

body[data-unit="vectors"] .unit-badge {
  background: rgba(56, 189, 248, 0.14);
  border-color: rgba(56, 189, 248, 0.45);
  color: #d6f2ff;
}

.tracker-panel {
  border-radius: 18px 18px 0 0;
  padding: 18px 24px 22px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.tracker-header,
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.tracker-header h2,
.history-header h3 {
  margin: 0;
  color: var(--text);
}

.eyebrow {
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 2.7rem);
}

.secondary-btn,
.primary-btn,
.mode-btn {
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

.secondary-btn:hover,
.primary-btn:hover,
.mode-btn:hover {
  transform: translateY(-1px);
}

.secondary-btn {
  background: #1f2937;
  color: var(--text);
  padding: 10px 16px;
}

.tracker-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.field input {
  background: rgba(15, 23, 42, 0.82);
  border: 1px solid rgba(148, 163, 184, 0.3);
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 1rem;
}

.field input:focus {
  outline: 2px solid var(--primary);
  border-color: transparent;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 15px;
  padding: 20px 24px;
  border-top: 1px solid rgba(148, 163, 184, 0.1);
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.card {
  background: var(--panel-soft);
  border-radius: 14px;
  padding: 18px 14px;
  text-align: center;
}

.card span {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.card strong {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.unit-panel {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  padding: 18px 24px 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  flex-wrap: wrap;
  background: rgba(17, 24, 39, 0.94);
}

.grade-filter-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 100%;
}

.grade-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.grade-btn {
  background: rgba(15, 23, 42, 0.8);
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}

.grade-btn:hover {
  border-color: rgba(148, 163, 184, 0.34);
  transform: translateY(-1px);
}

.grade-btn.active {
  background: linear-gradient(135deg, var(--primary), #22c55e);
  color: #06250f;
  border-color: transparent;
  box-shadow: 0 10px 22px rgba(74, 222, 128, 0.18);
}

.unit-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.unit-selector-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 12px;
  padding: 10px 14px;
  margin-right: 4px;
}

.unit-select-label {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.unit-select {
  background: #101827;
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.92rem;
  min-width: 180px;
}

.unit-btn,
.mode-btn {
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

.unit-btn {
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.96), rgba(15, 23, 42, 1));
  color: var(--text);
  padding: 12px 18px;
  min-width: 140px;
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.unit-btn:hover {
  border-color: rgba(148, 163, 184, 0.32);
  transform: translateY(-1px);
}

.unit-btn.active {
  background: linear-gradient(135deg, var(--accent), #f59e0b);
  color: #1f2937;
  border-color: rgba(251, 191, 36, 0.7);
  box-shadow: 0 10px 22px rgba(251, 191, 36, 0.18);
}

.mode-panel {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding: 18px 24px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  flex-wrap: wrap;
}

.mode-btn {
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.96), rgba(15, 23, 42, 1));
  color: var(--text);
  padding: 12px 18px;
  min-width: 120px;
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.mode-btn:hover {
  border-color: rgba(148, 163, 184, 0.34);
  transform: translateY(-1px);
}

.mode-btn.active {
  background: linear-gradient(135deg, var(--primary), #22c55e);
  color: #05230f;
  box-shadow: 0 10px 22px rgba(74, 222, 128, 0.18);
}

.rules-panel {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.76));
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  padding: 18px 24px 20px;
}

.rules-panel h3 {
  margin: 0 0 10px;
  color: var(--accent);
  text-align: center;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.rules-panel ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  margin: 0 0 18px;
  padding: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.rules-list li {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(148, 163, 184, 0.04);
  border: 1px solid rgba(148, 163, 184, 0.09);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.rules-list li:hover {
  border-color: rgba(148, 163, 184, 0.16);
  transform: translateY(-1px);
}

.rules-list li.rule-wide {
  grid-column: 1 / -1;
}

.rules-list li span {
  display: inline-block;
  color: #e2f3ff;
  font-size: 1.18rem;
  line-height: 1.5;
  letter-spacing: 0.01em;
  font-family: "Segoe UI", "Noto Sans Greek", "Arial Unicode MS", "DejaVu Sans", sans-serif;
  max-width: 100%;
  overflow-wrap: break-word;
}

.sign-table-panel {
  display: none;
  margin-top: 12px;
  padding: 18px 20px 14px;
  border-radius: 16px;
  background: linear-gradient(180deg, #f8f5ef 0%, #f0f3f7 100%);
  border: 2px solid rgba(46, 65, 102, 0.65);
  box-shadow: 0 10px 18px rgba(15, 23, 42, 0.18);
}

body[data-unit="roots"] .sign-table-panel {
  display: none !important;
}

body[data-unit="trigonometry"] .sign-table-panel:not(.hidden) {
  display: block;
}

.sign-table-panel h4 {
  margin: 0 0 12px;
  text-align: center;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #1b2d4a;
  font-weight: 800;
}

.sign-table {
  display: table;
  width: 100%;
  border-collapse: collapse;
  border: 2px solid rgba(15, 23, 42, 0.9);
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
}

.sign-row {
  display: table-row;
}

.sign-row > div {
  display: table-cell;
  padding: 10px 8px;
  border-right: 1px solid rgba(15, 23, 42, 0.35);
  border-bottom: 1px solid rgba(15, 23, 42, 0.35);
  text-align: center;
  vertical-align: middle;
  font-size: 1.05rem;
  font-weight: 700;
  color: #132238;
  background: #f9fafb;
  min-width: 80px;
  line-height: 1.2;
}

.sign-row:nth-child(odd) > div {
  background: #ffffff;
}

.sign-row:last-child > div {
  border-bottom: none;
}

.sign-row > div:last-child {
  border-right: none;
}

.sign-head > div {
  background: linear-gradient(180deg, #1c2946 0%, #12213d 100%);
  color: #f5c96b;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 800;
  min-height: 52px;
}

.level-panel {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding: 12px 24px 18px;
  background: rgba(17, 24, 39, 0.94);
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  flex-wrap: wrap;
}

.level-btn {
  border: none;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  background: rgba(51, 65, 85, 0.9);
  color: var(--text);
  padding: 10px 18px;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.level-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(148, 163, 184, 0.25);
}

.level-btn.active {
  background: linear-gradient(135deg, var(--accent), #f59e0b);
  color: #1f2937;
  box-shadow: 0 10px 20px rgba(251, 191, 36, 0.18);
}

.game-card {
  border-radius: 0 0 20px 20px;
  padding: 32px 24px 24px;
  text-align: center;
}

.history-panel {
  border-radius: 0 0 18px 18px;
  padding: 18px 24px 22px;
  margin-top: 0;
}

.teacher-panel {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.9));
  border: 1px solid var(--line);
  border-radius: 20px;
  margin-top: 18px;
  padding: 20px 24px 22px;
  box-shadow: 0 18px 42px var(--shadow);
}

.auth-panel {
  margin-top: 18px;
}

.teacher-status {
  margin: 8px 0 16px;
  color: var(--muted);
  font-size: 0.85rem;
}

.auth-grid,
.manager-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.teacher-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 12px;
  padding: 16px;
}

.teacher-form h4,
.roster-panel h4 {
  margin: 0 0 4px;
  color: var(--text);
}

.teacher-form input,
.teacher-form select,
.roster-panel select {
  background: rgba(15, 23, 42, 0.82);
  border: 1px solid rgba(148, 163, 184, 0.3);
  border-radius: 12px;
  color: var(--text);
  padding: 12px 14px;
  font-size: 0.96rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.teacher-form input:focus,
.teacher-form select:focus,
.roster-panel select:focus {
  outline: none;
  border-color: rgba(74, 222, 128, 0.8);
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.18);
}

.class-manager {
  margin-top: 18px;
}

.compact-form {
  min-height: 100%;
}

.teacher-config {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.48);
}

.teacher-config summary {
  padding: 10px 12px;
  color: var(--muted-strong);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
}

.teacher-config[open] summary {
  border-bottom: 1px solid rgba(148, 163, 184, 0.14);
}

.subject-picker {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 12px;
}

.subject-picker label {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
}

.subject-picker input {
  flex: 0 0 auto;
  margin: 3px 0 0;
}

.roster-panel {
  margin-top: 18px;
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 12px;
  padding: 16px;
}

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

.student-roster-list {
  display: grid;
  gap: 8px;
}

.student-roster-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(148, 163, 184, 0.08);
}

.student-roster-item span {
  color: var(--text);
}

.roster-actions {
  display: inline-flex;
  gap: 8px;
  flex-shrink: 0;
}

.student-roster-item button {
  background: rgba(148, 163, 184, 0.12);
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

.danger-btn {
  background: rgba(239, 68, 68, 0.12);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

.danger-btn:hover {
  background: rgba(239, 68, 68, 0.2);
}

.hidden {
  display: none !important;
}

.app.hidden {
  display: none !important;
}

.teacher-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.teacher-header h3 {
  margin: 0;
}

#teacherClassLabel,
#sessionSummary {
  color: var(--muted);
  font-size: 0.82rem;
}

.teacher-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.summary-box {
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 12px;
  padding: 14px 16px;
}

.summary-box span {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.summary-box strong {
  font-size: clamp(1.3rem, 2vw, 2rem);
  color: var(--text);
}

.teacher-table {
  display: grid;
  gap: 8px;
}

.teacher-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1.2fr;
  gap: 12px;
  align-items: center;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 12px;
  padding: 12px 14px;
}

.teacher-row.header {
  background: rgba(30, 41, 59, 1);
  font-size: 0.76rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.teacher-row > div {
  overflow: hidden;
  text-overflow: ellipsis;
}

.attempt-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.attempt-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.attempt-item {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  background: rgba(15, 23, 42, 0.78);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 12px;
  padding: 12px 14px;
}

.attempt-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.attempt-meta strong {
  font-size: 0.95rem;
  color: var(--text);
}

.attempt-meta span {
  font-size: 0.75rem;
  color: var(--muted);
}

.attempt-score {
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

.mode-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.mode-search-wrap {
  display: grid;
  gap: 7px;
  max-width: 520px;
  margin: 0 auto 16px;
}

.mode-search-label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.mode-search {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.72);
  color: var(--text);
  font: inherit;
}

.mode-search:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(94, 234, 212, 0.16);
}

.mode-search-empty {
  margin: 0;
  color: #fbbf24;
  font-size: 0.88rem;
}

#questionText {
  margin: 0 0 24px;
  padding: 16px 20px;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(15, 23, 42, 0.42);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 8px 24px rgba(15, 23, 42, 0.18);
  font-family: "Segoe UI", "Noto Sans Greek", "Arial Unicode MS", "DejaVu Sans", sans-serif;
  font-size: clamp(1.1rem, 1.8vw, 1.55rem);
  line-height: 1.55;
  letter-spacing: normal;
  word-spacing: 0.05em;
  color: var(--text);
  display: block;
  text-align: center;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: normal;
  hyphens: manual;
}

body[data-unit="trigonometry"] #questionText {
  background: rgba(168, 85, 247, 0.08);
  border-color: rgba(168, 85, 247, 0.22);
}

body[data-unit="roots"] #questionText {
  background: rgba(34, 197, 94, 0.06);
  border-color: rgba(34, 197, 94, 0.2);
}

body[data-unit="circle"] #questionText {
  background: rgba(45, 212, 191, 0.07);
  border-color: rgba(45, 212, 191, 0.22);
}

body[data-unit="vectors"] #questionText {
  background: rgba(56, 189, 248, 0.07);
  border-color: rgba(56, 189, 248, 0.22);
}

.question-diagram {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: -14px 0 24px;
  padding: 18px 12px;
  border-radius: 18px;
  border: 1px solid rgba(45, 212, 191, 0.3);
  background: linear-gradient(180deg, rgba(8, 24, 30, 0.86), rgba(15, 23, 42, 0.72));
  box-shadow: 0 16px 40px rgba(14, 116, 144, 0.18);
  min-height: 180px;
}

.question-diagram.hidden {
  display: none;
}

.question-diagram svg {
  display: block;
  width: min(100%, 360px);
  max-width: 360px;
  height: auto;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.45);
}

.graph-answer-hidden {
  display: none !important;
}

.graph-match {
  width: 100%;
  display: grid;
  gap: 18px;
}

.graph-match-equations,
.graph-match-targets {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.graph-match-equation,
.graph-match-target {
  color: var(--text);
  font: inherit;
  cursor: pointer;
  border: 1px solid rgba(94, 234, 212, 0.3);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.72);
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.graph-match-equation {
  padding: 12px 10px;
  font-weight: 700;
}

.graph-match-equation:hover,
.graph-match-equation.selected {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: rgba(45, 212, 191, 0.16);
}

.graph-match-equation.dragging {
  opacity: 0.55;
}

.graph-match-target {
  position: relative;
  min-width: 0;
  padding: 10px 8px 12px;
}

.graph-match-target:hover,
.graph-match-target.drag-over {
  border-color: #fbbf24;
  background: rgba(251, 191, 36, 0.12);
}

.graph-match-target.incorrect {
  border-color: #f87171;
  background: rgba(248, 113, 113, 0.12);
}

.graph-match-target svg {
  width: 100%;
  max-width: 300px;
  margin: 4px auto 0;
}

.graph-match-label,
.graph-match-drop-hint {
  display: block;
}

.graph-match-label {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

.graph-match-drop-hint {
  color: var(--muted);
  font-size: 0.72rem;
}

.interactive-widget {
  width: 100%;
  display: grid;
  gap: 14px;
}

.interactive-widget-answer {
  display: none !important;
}

.interactive-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.interactive-option,
.matching-card,
.ordering-card,
.interactive-submit {
  border: 1px solid rgba(94, 234, 212, 0.3);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.72);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.interactive-option,
.matching-card,
.ordering-card {
  min-height: 50px;
  padding: 12px 14px;
  text-align: left;
}

.interactive-option:hover,
.interactive-option.selected,
.matching-card:hover,
.matching-card.selected,
.matching-card.matched,
.ordering-card:hover,
.ordering-card.selected {
  transform: translateY(-1px);
  border-color: var(--accent);
  background: rgba(45, 212, 191, 0.15);
}

.interactive-option-letter {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  margin-right: 9px;
  border-radius: 50%;
  background: rgba(94, 234, 212, 0.18);
  color: var(--accent);
}

.interactive-submit {
  justify-self: center;
  padding: 11px 18px;
  background: rgba(94, 234, 212, 0.16);
}

.matching-widget {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.matching-column,
.ordering-list {
  display: grid;
  gap: 10px;
}

.matching-widget .interactive-submit {
  grid-column: 1 / -1;
}

.interactive-selection {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  text-align: center;
}

.value-table {
  justify-items: center;
}

.value-table table {
  width: min(100%, 360px);
  border-collapse: collapse;
  background: rgba(15, 23, 42, 0.6);
}

.value-table td {
  padding: 12px 18px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  text-align: center;
  font-weight: 700;
}

.numberline-track {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto 1fr auto 1fr auto;
  align-items: center;
  gap: 8px;
  width: min(100%, 520px);
  margin: 4px auto 8px;
  color: var(--muted);
  font-weight: 700;
}

.numberline-track i {
  height: 3px;
  background: var(--accent);
  border-radius: 3px;
}

.numberline-track span {
  min-width: 28px;
  text-align: center;
}

#questionText .mjx-container,
.rules-list li span .mjx-container,
.sign-table-panel .mjx-container {
  font-size: 1.08em !important;
  vertical-align: baseline;
  margin: 0 0.06em;
  max-width: 100%;
  display: inline-block;
}

#questionText .mjx-container * {
  white-space: normal;
  overflow-wrap: anywhere;
}

#answerForm {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.answer-options {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  order: 2;
}

.answer-options.hidden {
  display: none;
}

.answer-option {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 12px 14px;
  border: 1px solid rgba(94, 234, 212, 0.3);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.72);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.answer-option:hover,
.answer-option:focus-visible {
  transform: translateY(-1px);
  border-color: var(--accent);
  background: rgba(45, 212, 191, 0.14);
  outline: none;
}

.answer-option-letter {
  display: grid;
  flex: 0 0 28px;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(94, 234, 212, 0.18);
  color: var(--accent);
}

.multiple-choice-answer #answerInput,
.multiple-choice-answer button[type="submit"],
.multiple-choice-answer .math-keyboard {
  display: none;
}

.multiple-choice-answer .hint-btn {
  order: 3;
}

.objective-row {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: 999px;
  padding: 8px 14px;
  margin: 0 auto 16px;
  max-width: 100%;
}

.test-type-row {
  margin-top: 4px;
  margin-bottom: 12px;
  background: rgba(59, 130, 246, 0.08);
  border-color: rgba(59, 130, 246, 0.25);
}

.tag {
  display: inline-block;
  background: var(--accent);
  color: #1f2937;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.subunit-badge {
  display: inline-block;
  align-self: flex-start;
  margin-bottom: 8px;
  background: rgba(168, 85, 247, 0.16);
  color: #d8b4fe;
  border: 1px solid rgba(168, 85, 247, 0.4);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.subunit-badge.hidden {
  display: none;
}

#objectiveText {
  font-size: 0.9rem;
  color: var(--muted);
}

#testTypeLabel {
  font-size: 0.9rem;
  color: var(--muted);
}

#answerInput {
  width: min(260px, 80vw);
  padding: 16px 18px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(15, 23, 42, 0.82);
  color: var(--text);
  font-size: 1.1rem;
}

#answerInput:focus {
  outline: 2px solid var(--primary);
  border-color: transparent;
}

.math-keyboard {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  width: min(100%, 460px);
}

.math-keyboard button {
  min-width: 38px;
  height: 36px;
  padding: 0 8px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 8px;
  background: rgba(30, 41, 59, 0.84);
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

.math-keyboard button:hover,
.math-keyboard button:focus-visible {
  border-color: var(--accent);
  background: rgba(251, 191, 36, 0.16);
  outline: none;
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #06250f;
  padding: 16px 22px;
}

.hint-btn {
  background: rgba(251, 191, 36, 0.16);
  color: var(--accent);
  border: 1px solid rgba(251, 191, 36, 0.35);
}

.message {
  min-height: 28px;
  margin: 18px 0 0;
  font-size: 1rem;
  color: var(--muted);
}

.hint-box {
  margin-top: 14px;
  color: var(--muted);
  background: rgba(148, 163, 184, 0.06);
  border: 1px solid rgba(148, 163, 184, 0.14);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.9rem;
  line-height: 1.5;
  text-align: left;
  max-width: 100%;
  word-break: break-word;
  white-space: normal;
}

.message.success {
  color: #86efac;
}

.message.error {
  color: #fca5a5;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 560px) {
  .app {
    width: min(100% - 24px, 980px);
    padding: 12px 0 32px;
  }

  .class-landing {
    align-items: flex-start;
    overflow-y: auto;
    padding: 20px 12px;
  }

  .class-landing-card {
    width: 100%;
    margin: auto 0;
    padding: 22px 16px;
  }

  .class-landing-card h2 {
    font-size: 1.75rem;
  }

  .grade-choice-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .class-choice-btn {
    padding: 16px 14px;
  }

  .topbar {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
    padding: 16px;
  }

  .topbar-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    width: 100%;
    gap: 8px;
  }

  #muUser {
    grid-column: 1 / -1;
    justify-content: flex-start;
    max-width: 100%;
  }

  .unit-badge {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .tab-nav {
    flex-wrap: nowrap;
    gap: 8px;
    padding: 8px;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .tab-btn {
    flex: 0 0 auto;
    min-width: 92px;
    padding: 10px 12px;
  }

  .unit-panel {
    align-items: stretch;
    padding: 14px 12px 0;
  }

  .unit-selector-wrap {
    width: 100%;
    min-width: 0;
    margin-right: 0;
  }

  .unit-select {
    width: 100%;
    min-width: 0;
    text-overflow: ellipsis;
  }

  .game-card {
    padding: 18px 14px 20px;
  }

  .question-timer {
    margin: -4px auto 12px;
  }

  .mode-label {
    margin-bottom: 6px;
    font-size: 0.72rem;
  }

  .objective-row {
    gap: 6px;
    margin-bottom: 8px;
    padding: 6px 10px;
  }

  .test-type-row {
    margin-top: 0;
    margin-bottom: 8px;
  }

  #objectiveText,
  #testTypeLabel {
    font-size: 0.8rem;
  }

  #questionText {
    margin-bottom: 18px;
    padding: 16px 14px;
    font-size: 1.35rem;
  }

  .scoreboard {
    grid-template-columns: 1fr;
  }

  .manager-grid {
    grid-template-columns: 1fr;
  }

  .teacher-panel {
    padding: 16px;
  }

  .subject-picker {
    grid-template-columns: 1fr;
  }

  .rules-panel ul {
    grid-template-columns: 1fr;
  }

  .sign-table {
    grid-template-columns: 1fr repeat(3, minmax(60px, 1fr));
  }

  #answerForm {
    flex-direction: column;
    align-items: stretch;
  }

  #answerInput,
  .primary-btn,
  .secondary-btn {
    width: 100%;
  }

  .graph-match-equations,
  .graph-match-targets {
    grid-template-columns: 1fr;
  }

  .answer-options {
    grid-template-columns: 1fr;
  }

  .interactive-options,
  .matching-widget {
    grid-template-columns: 1fr;
  }

  .matching-widget .interactive-submit {
    grid-column: auto;
  }
}