:root {
  --bg: #08111a;
  --bg-2: #0d1826;
  --panel: #101a2a;
  --panel-2: #152238;
  --line: #27425d;
  --text: #e6f0f8;
  --text-muted: #8fa7bc;
  --text-strong: #f4fbff;
  --brand: #59d7ff;
  --brand-2: #7a8dff;
  --ok: #1ec28b;
  --warn: #f5a524;
  --bad: #ff5f73;
  --focus: #99ccff;
  --shadow: 0 16px 38px rgba(0, 0, 0, 0.32);
  --radius: 14px;
  --radius-sm: 10px;
  --mono: Consolas, "Cascadia Code", Menlo, monospace;
}

body[data-theme="light"] {
  --bg: #eef4fb;
  --bg-2: #f7fbff;
  --panel: #ffffff;
  --panel-2: #e7f0ff;
  --line: #b5c7e1;
  --text: #182436;
  --text-muted: #455b78;
  --text-strong: #0f1d2f;
  --brand: #0f6fff;
  --brand-2: #3c8cff;
  --ok: #0f9f6e;
  --warn: #c98300;
  --bad: #d93d55;
  --focus: #005fcc;
  --shadow: 0 12px 30px rgba(58, 84, 120, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
[hidden] { display: none !important; }

/* Reset fieldset browser defaults to prevent min-width overflow */
fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: none;
}

body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(1200px 600px at 100% -20%, rgba(89,215,255,0.12), transparent),
              radial-gradient(900px 500px at -10% 10%, rgba(122,141,255,0.1), transparent),
              linear-gradient(135deg, rgba(89,215,255,0.05), transparent 24%),
              var(--bg);
  font-family: Bahnschrift, "Segoe UI", "Inter", system-ui, -apple-system, sans-serif;
  line-height: 1.55;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.26;
}

a { color: var(--brand); }
button, input, select, textarea { font: inherit; }

.app {
  display: grid;
  grid-template-columns: clamp(250px, 23vw, 320px) minmax(0, 1fr);
  min-height: 100vh;
  align-items: start;
  align-content: start;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(13, 24, 38, 0.96), rgba(7, 17, 28, 0.98));
  position: relative;
  min-height: 100vh;
  padding: 18px;
  box-shadow: inset -1px 0 0 rgba(89, 215, 255, 0.08);
}

body[data-theme="light"] .sidebar {
  background: linear-gradient(180deg, #f9fcff, #eef5fd);
}

body[data-theme="light"] .chip {
  border-color: #b5c7e1;
  background: rgba(15, 111, 255, 0.08);
  color: #0f6fff;
}

body[data-theme="light"] .progress-wrap {
  background: #d4e5f7;
  border-color: #b5c7e1;
}

body[data-theme="light"] .mod-btn:hover {
  border-color: #3c8cff;
}

body[data-theme="light"] .mod-num {
  border-color: #b5c7e1;
  color: #0f6fff;
}

body[data-theme="light"] .badge {
  border-color: #b5c7e1;
  background: #e7f0ff;
  color: #0f6fff;
}

body[data-theme="light"] .btn {
  border-color: #b5c7e1;
}

body[data-theme="light"] .btn:hover {
  border-color: #3c8cff;
}

body[data-theme="light"] .topbar {
  border-bottom-color: rgba(181, 199, 225, 0.4);
}

body[data-theme="light"] .tag {
  border-color: #b5c7e1;
  background: #e7f0ff;
  color: #0f6fff;
}

body[data-theme="light"] .final-exam {
  border-color: #b5c7e1;
  background: #f0f6ff;
}

body[data-theme="light"] .practical-work {
  border-color: color-mix(in srgb, #0f9f6e 45%, #b5c7e1);
  background: color-mix(in srgb, #0f9f6e 8%, transparent);
}

body[data-theme="light"] .practical-work h3 {
  color: #0f9f6e;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.brand h1 {
  margin: 0;
  font-size: 16px;
  letter-spacing: 0.2px;
  text-transform: uppercase;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--brand) 12%, transparent);
  color: var(--brand);
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  font-family: var(--mono);
}

.kpi {
  margin: 12px 0 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.kpi .card {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  padding: 10px;
}

.kpi .val {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-strong);
  font-family: var(--mono);
}

.kpi .lbl {
  color: var(--text-muted);
  font-size: 12px;
}

.progress-wrap {
  width: 100%;
  height: 8px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--line) 60%, var(--panel-2));
  overflow: hidden;
  border: 1px solid var(--line);
}

.progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  transition: width 0.4s ease;
}

.mod-list {
  margin: 16px 0 10px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.mod-btn {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--panel);
  color: var(--text);
  padding: 10px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.mod-btn:hover { transform: translateY(-1px); border-color: var(--brand); }
.mod-btn[aria-current="true"] { border-color: var(--brand); background: var(--panel-2); }
.mod-btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.mod-btn[data-status="open"] {
  border-color: color-mix(in srgb, var(--ok) 75%, #2a3a5d);
  background: color-mix(in srgb, var(--ok) 12%, var(--panel));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ok) 45%, transparent);
}

.mod-btn[data-status="open"] .status {
  color: color-mix(in srgb, var(--ok) 85%, #d9fff0);
  font-weight: 700;
}

.mod-num {
  width: 24px;
  height: 24px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--panel-2);
}

.mod-meta {
  overflow: hidden;
}

.mod-title {
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0 0 1px;
}

.mod-sub {
  color: var(--text-muted);
  font-size: 11px;
}

.status {
  font-size: 14px;
}

.achievements {
  margin-top: 14px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.achievements h2 {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
}

.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.badge {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--brand) 12%, var(--panel-2));
  color: var(--brand);
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
}

.badge-entry {
  border-color: rgba(89, 215, 255, 0.34);
  background: rgba(89, 215, 255, 0.12);
  color: #8ae7ff;
}

.content {
  padding: clamp(16px, 2vw, 24px) clamp(14px, 2.2vw, 28px) 44px;
  max-width: 1180px;
  width: 100%;
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  z-index: 15;
  padding: 10px 0;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
}

.topbar h2 {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 28px);
}

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

.btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
}

.btn:hover { border-color: var(--brand); }
.btn.primary { background: linear-gradient(90deg, var(--brand), var(--brand-2)); border-color: transparent; color: #0b1322; }
.btn:disabled { opacity: .6; cursor: not-allowed; }

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-grid {
  width: min(980px, 100%);
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 14px;
}

.auth-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 16px;
}

.auth-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.field {
  display: grid;
  gap: 6px;
  margin: 10px 0;
}

.field input,
.field select {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel-2);
  color: var(--text);
  padding: 9px 10px;
}

.mini-note {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
}

.user-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 10px;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--panel);
  font-family: var(--mono);
}

.admin-panel {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 12px;
}

.admin-user {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-2);
  padding: 10px;
  margin: 8px 0;
}

.admin-user strong {
  display: block;
  font-size: 14px;
}

.admin-user span {
  font-size: 12px;
  color: var(--text-muted);
}

.module-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(21, 34, 56, 0.96), rgba(16, 26, 42, 0.98));
  box-shadow: var(--shadow);
  overflow: hidden;
}

.module-head {
  padding: 18px;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  position: relative;
}

.module-head::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(89, 215, 255, 0.4), transparent);
}

.module-head h3 { margin: 0 0 6px; font-size: 21px; }
.module-head p { margin: 0; color: var(--text-muted); }

.tag-row { display: flex; flex-wrap: wrap; gap: 7px; }

.tag {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--brand) 12%, var(--panel));
  color: var(--brand);
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--mono);
}

.module-body {
  padding: 18px;
  display: grid;
  gap: 18px;
}

.module-tabs {
  display: flex;
  gap: 8px;
  margin: 0 0 12px;
  flex-wrap: wrap;
}

.tab-btn {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 9px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.tab-btn[aria-selected="true"] {
  border-color: var(--brand);
  background: color-mix(in srgb, var(--brand) 18%, var(--panel));
}

.tab-pane {
  display: block;
}

.tab-pane[hidden] {
  display: none;
}

.module-stage {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 14px;
  position: relative;
}

.module-stage::before {
  content: "";
  position: absolute;
  top: 12px;
  right: 12px;
  width: 76px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(89, 215, 255, 0.38));
}

.module-stage h4 {
  margin: 0 0 10px;
  font-size: 17px;
}

.theory-intro {
  display: grid;
  grid-template-columns: 1.25fr .95fr;
  gap: 16px;
  align-items: start;
}

.theory-copy {
  display: grid;
  gap: 10px;
}

.theory-copy p {
  margin: 0;
  font-size: 15px;
  color: var(--text);
}

.theory-copy p.secondary {
  color: var(--text-muted);
}

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

.mini-book-section {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel-2) 85%, transparent);
  padding: 12px;
  margin-top: 12px;
}

.mini-book-section h5 {
  margin: 0 0 7px;
  font-size: 14px;
}

.mini-book-section p {
  margin: 0 0 7px;
  color: var(--text);
  font-size: 14px;
}

.mini-book-section ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 13px;
}

.stack {
  display: grid;
  gap: 14px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-2);
  padding: 12px;
}

.panel h4 {
  margin: 0 0 8px;
  font-size: 15px;
}

.editor-panel {
  border: 1px solid color-mix(in srgb, var(--brand) 45%, var(--line));
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel-2) 82%, transparent);
  padding: 12px;
  margin-bottom: 12px;
  display: grid;
  gap: 10px;
}

.editor-panel h5 {
  margin: 0;
  font-size: 14px;
}

.editor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.editor-panel textarea,
.editor-panel input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel);
  color: var(--text);
  padding: 9px 10px;
}

.editor-panel textarea {
  min-height: 220px;
  resize: vertical;
  line-height: 1.5;
}

.editor-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.admin-edit-section {
  background: color-mix(in srgb, var(--brand) 10%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--brand) 30%, var(--line));
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 18px;
  display: grid;
  gap: 12px;
}

.admin-edit-section p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.admin-edit-section button {
  align-self: start;
}

.panel p, .panel li {
  color: var(--text);
  font-size: 14px;
}

.panel ul { margin: 0; padding-left: 18px; }

.case-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 8px;
  align-items: center;
  margin: 8px 0;
}

.case-row select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 7px 8px;
}

.case-hint {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.alert {
  border-left: 3px solid;
  padding: 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel-2) 92%, transparent);
  font-size: 13px;
}

.alert.warn { border-color: var(--warn); }
.alert.bad { border-color: var(--bad); }
.alert.ok { border-color: var(--ok); }

.image-wrap {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--panel-2);
}

.image-wrap img {
  display: block;
  width: 100%;
  max-height: 210px;
  object-fit: contain;
  background: var(--panel-2);
  padding: 10px;
}

.image-wrap figcaption {
  border-top: 1px solid var(--line);
  padding: 8px 10px;
  color: var(--text-muted);
  font-size: 12px;
}

.quiz {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 12px;
}

.quiz h4 { margin: 0 0 8px; }

.question {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px 12px;
  margin: 10px 0;
  background: var(--panel-2);
  width: 100%;
}

.quiz-locked {
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 12px;
  background: color-mix(in srgb, var(--panel-2) 88%, transparent);
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 10px;
}

.placeholder-note {
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--text-muted);
  background: color-mix(in srgb, var(--panel) 75%, transparent);
}

.question legend {
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-strong);
  padding: 0 4px;
  float: left;
  width: 100%;
}

.option {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin: 5px 0;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 5px 6px;
}

.option:focus-within {
  border-color: var(--focus);
  background: color-mix(in srgb, var(--focus) 12%, transparent);
}

.option label {
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  line-height: 1.4;
}

.quiz-tools {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.feedback {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text);
  min-height: 24px;
}

.xp-pop {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 30;
  padding: 10px 14px;
  border-radius: 10px;
  color: #042018;
  background: linear-gradient(90deg, #2be2a6, #28d0ff);
  box-shadow: var(--shadow);
  font-weight: 700;
  transform: translateY(30px);
  opacity: 0;
  pointer-events: none;
  transition: transform .35s ease, opacity .35s ease;
}

.xp-pop.show {
  transform: translateY(0);
  opacity: 1;
}

.final-exam {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--brand) 8%, var(--panel));
  padding: 12px;
}

.entry-badge-panel {
  margin-top: 18px;
  border: 1px solid color-mix(in srgb, var(--brand) 34%, var(--line));
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(89, 215, 255, 0.1), rgba(122, 141, 255, 0.08));
  padding: 14px;
  display: grid;
  gap: 10px;
}

.entry-badge-panel h3 {
  color: var(--text-strong);
  font-size: 18px;
}

.entry-badge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.practical-work {
  margin-top: 18px;
  border: 1px solid color-mix(in srgb, var(--ok) 45%, var(--line));
  border-radius: 12px;
  background: color-mix(in srgb, var(--ok) 12%, var(--panel));
  padding: 16px;
  display: grid;
  gap: 12px;
}

.practical-work h3 {
  margin: 0;
  color: var(--ok);
  font-size: 20px;
}

.practical-work p {
  margin: 0;
  color: var(--text);
  line-height: 1.6;
}

.practical-task {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 12px;
  display: grid;
  gap: 10px;
}

.practical-task strong {
  color: var(--text);
  font-size: 13px;
}

.footer {
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 12px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
  display: flex;
  gap: 10px;
  justify-content: space-between;
  flex-wrap: wrap;
}

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

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: 8px;
}

.admin-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  padding: 20px;
}

.admin-modal.show {
  display: flex;
}

.admin-modal-content {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.admin-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}

.admin-modal-header h2 {
  margin: 0;
  font-size: 22px;
}

.admin-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 28px;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: background 0.2s ease;
}

.admin-modal-close:hover {
  background: var(--panel-2);
  color: var(--text);
}

.admin-modal-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--line);
  padding: 0;
  flex-shrink: 0;
  background: var(--panel-2);
}

.admin-modal-tab {
  border: none;
  background: none;
  color: var(--text-muted);
  padding: 12px 16px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.2s ease;
}

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

.admin-modal-tab[aria-selected="true"] {
  color: var(--brand);
  border-bottom-color: var(--brand);
}

.admin-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 22px;
  display: grid;
  gap: 18px;
}

.admin-modal-section {
  display: none;
}

.admin-modal-section[aria-hidden="false"] {
  display: block;
}

.edit-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  padding: 20px;
}

.edit-modal.show {
  display: flex;
}

.edit-modal-content {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.edit-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}

.edit-modal-header h2 {
  margin: 0;
  font-size: 22px;
}

.edit-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 28px;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: background 0.2s ease;
}

.edit-modal-close:hover {
  background: var(--panel-2);
  color: var(--text);
}

.edit-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 22px;
  display: grid;
  gap: 18px;
}

.exam-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(4, 10, 20, 0.9);
  z-index: 1100;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.exam-modal.show {
  display: flex;
}

.exam-modal-content {
  width: min(1120px, 100%);
  max-height: 92vh;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.exam-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-2) 82%, transparent);
  flex-shrink: 0;
}

.exam-modal-header h2 {
  margin: 0;
  font-size: 24px;
}

.exam-modal-header p {
  margin: 6px 0 0;
  color: var(--text-muted);
  font-size: 13px;
}

.exam-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 28px;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.exam-modal-close:hover {
  background: var(--panel-2);
  color: var(--text);
}

.exam-modal-body {
  overflow-y: auto;
  padding: 22px;
  display: grid;
  gap: 16px;
}

.final-exam-launch {
  display: grid;
  gap: 12px;
  align-items: start;
}

.final-exam-launch .btn {
  width: fit-content;
}

@media (max-width: 1020px) {
  .app { grid-template-columns: 1fr; }
  .auth-grid { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .theory-intro { grid-template-columns: 1fr; }
  .theory-grid { grid-template-columns: 1fr; }
  .editor-grid { grid-template-columns: 1fr; }
  .topbar { position: static; }
}

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