:root {
  --bg: #0b1120;
  --panel: #111827;
  --panel-2: #172033;
  --panel-3: #0f172a;
  --ink: #f8fafc;
  --muted: #a7b0c0;
  --line: #273449;
  --primary: #2dd4bf;
  --primary-2: #5eead4;
  --blue: #60a5fa;
  --amber: #f59e0b;
  --red: #fb7185;
  --green-soft: #0c2d2a;
  --blue-soft: #10233f;
  --amber-soft: #2d2110;
  --red-soft: #321a20;
  --shadow: 0 18px 44px rgba(0, 0, 0, .25);
  --radius: 8px;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
}

:root[data-theme="light"] {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-2: #f9fbff;
  --panel-3: #edf2fb;
  --ink: #111827;
  --muted: #667085;
  --line: #d9dee8;
  --primary: #0f766e;
  --primary-2: #115e59;
  --blue: #2563eb;
  --amber: #b45309;
  --red: #b91c1c;
  --green-soft: #e7f5f1;
  --blue-soft: #eaf1ff;
  --amber-soft: #fff4df;
  --red-soft: #fdeceb;
  --shadow: 0 12px 30px rgba(17, 24, 39, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  letter-spacing: 0;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
input,
textarea {
  color: inherit;
}

.hidden { display: none !important; }

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 30;
  max-width: 360px;
  padding: 12px 14px;
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .2s ease, transform .2s ease;
  pointer-events: none;
  font-size: 14px;
  line-height: 1.35;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 18% 20%, rgba(45, 212, 191, .18), transparent 32%),
    radial-gradient(circle at 80% 76%, rgba(245, 158, 11, .16), transparent 30%),
    var(--bg);
}

.auth-card {
  width: min(100%, 480px);
  background: rgba(17, 24, 39, .88);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

:root[data-theme="light"] .auth-card {
  background: rgba(255,255,255,.94);
}

.logo-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.logo-mark img,
.brand img {
  width: 46px;
  height: 46px;
  border-radius: 12px;
}

.logo-mark strong,
.brand strong {
  display: block;
  font-size: 18px;
}

.logo-mark span,
.brand span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}

.auth-card h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.12;
}

.auth-card p {
  margin: 10px 0 18px;
  color: var(--muted);
  line-height: 1.45;
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 14px;
}

.auth-tabs button,
.auth-form button,
.primary,
.ghost,
.danger,
.mini-btn {
  min-height: 40px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

.auth-tabs button.active,
.auth-form button,
.primary {
  background: var(--primary);
  color: #06211f;
  border-color: transparent;
}

.auth-form {
  display: grid;
  gap: 12px;
}

.auth-form label,
.course-picker label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.auth-form input,
.course-picker select,
textarea {
  width: 100%;
  min-height: 42px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel-3);
  color: var(--ink);
  padding: 0 11px;
}

textarea {
  min-height: 118px;
  resize: vertical;
  padding: 10px 11px;
  line-height: 1.45;
}

.app {
  display: grid;
  grid-template-columns: 318px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: #020617;
  border-right: 1px solid var(--line);
  padding: 20px 16px;
}

:root[data-theme="light"] .sidebar {
  background: #111827;
  color: #f8fafc;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.progress-panel,
.metrics,
.side-actions {
  border: 1px solid rgba(255,255,255,.11);
  background: rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 14px;
  margin: 12px 0;
}

.progress-panel > span {
  display: block;
  color: #a7f3d0;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 900;
  margin-bottom: 8px;
}

.progress-panel strong {
  display: block;
  font-size: 42px;
  line-height: 1;
  margin-bottom: 10px;
}

.bar {
  height: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.16);
  overflow: hidden;
}

.bar i {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--amber));
  transition: width .25s ease;
}

.progress-panel p {
  margin: 9px 0 0;
  color: #cbd5e1;
  font-size: 12px;
  line-height: 1.42;
}

.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.metrics div {
  background: rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 10px;
}

.metrics span {
  color: #cbd5e1;
  font-size: 11px;
  text-transform: uppercase;
  font-weight: 850;
}

.metrics strong {
  display: block;
  margin-top: 5px;
  font-size: 19px;
}

.side-nav {
  display: grid;
  gap: 6px;
  margin: 12px 0;
}

.side-nav a {
  display: grid;
  grid-template-columns: 28px 1fr;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 7px 8px;
  border-radius: var(--radius);
  color: #eef2ff;
  text-decoration: none;
  font-size: 13px;
  line-height: 1.25;
}

.side-nav a:hover {
  background: rgba(255,255,255,.08);
}

.side-nav span {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: rgba(255,255,255,.11);
  font-weight: 900;
  font-size: 12px;
}

.side-actions {
  display: grid;
  gap: 8px;
}

.ghost {
  background: rgba(255,255,255,.08);
  color: #fff;
  border-color: rgba(255,255,255,.16);
}

.danger {
  background: transparent;
  color: #fecaca;
  border-color: rgba(251,113,133,.3);
}

.workspace {
  width: 100%;
  max-width: 1240px;
  padding: 28px;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  align-items: start;
  gap: 18px;
  margin-bottom: 20px;
}

.eyebrow {
  color: var(--primary);
  font-size: 13px;
  text-transform: uppercase;
  font-weight: 950;
  margin-bottom: 8px;
}

.topbar h1 {
  margin: 0;
  font-size: 36px;
  line-height: 1.08;
}

.topbar p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.45;
  max-width: 820px;
}

.course-picker {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}

.dash-card,
.day-card,
.lesson-card,
.exam-card,
.review-panel,
.empty-state {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.dash-card {
  padding: 14px;
  min-height: 116px;
}

.dash-card span {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  font-weight: 950;
}

.dash-card strong {
  display: block;
  margin: 9px 0 6px;
  font-size: 24px;
  line-height: 1;
}

.dash-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.36;
}

.section {
  margin: 26px 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 14px;
  margin-bottom: 12px;
}

.section-head h2 {
  margin: 0;
  font-size: 25px;
}

.section-head p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

.schedule-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.day-card {
  padding: 12px;
  min-height: 140px;
}

.day-card strong {
  display: block;
  margin-bottom: 5px;
}

.day-card p {
  color: var(--muted);
  margin: 0 0 8px;
  font-size: 13px;
  line-height: 1.36;
}

.day-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.module-list,
.lesson-list,
.exam-list {
  display: grid;
  gap: 14px;
}

.module-list {
  gap: 30px;
}

.module-card {
  padding: 0 0 28px;
  border-bottom: 1px solid var(--line);
}

.module-card:last-child {
  border-bottom: 0;
}

.module-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 18px;
  align-items: end;
  margin-bottom: 12px;
}

.module-kicker,
.exam-type,
.exam-group-head span {
  display: inline-block;
  color: var(--primary);
  font-size: 12px;
  font-weight: 950;
  text-transform: uppercase;
  margin-bottom: 7px;
}

.module-head h3,
.exam-group-head h3 {
  margin: 0;
  font-size: 26px;
  line-height: 1.15;
}

.module-head p {
  margin: 7px 0 0;
  color: var(--muted);
  line-height: 1.42;
  max-width: 760px;
}

.module-progress {
  text-align: right;
}

.module-progress strong {
  display: block;
  font-size: 32px;
  line-height: 1;
  margin-bottom: 5px;
}

.module-progress span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.bar.small {
  height: 8px;
  margin-top: 8px;
}

.module-goal {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px 16px;
  align-items: center;
  padding: 12px 0;
}

.module-goal strong {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  text-transform: uppercase;
}

.module-goal p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.42;
}

.module-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 14px;
  align-items: start;
}

.module-lessons {
  display: grid;
  gap: 12px;
}

.module-evaluations {
  position: sticky;
  top: 14px;
  display: grid;
  gap: 10px;
  border-left: 3px solid var(--primary);
  padding-left: 12px;
}

.module-evaluations h4 {
  margin: 0;
  font-size: 15px;
}

.module-evaluations p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.exam-launch-card {
  display: grid;
  gap: 4px;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  color: inherit;
  text-decoration: none;
}

.exam-launch-card:hover {
  border-color: rgba(45, 212, 191, .48);
}

.exam-launch-card span,
.exam-launch-card p {
  color: var(--muted);
  font-size: 12px;
}

.exam-launch-card strong {
  font-size: 14px;
  line-height: 1.3;
}

.exam-launch-card p {
  margin: 0;
}

.exam-launch-card em {
  color: var(--primary);
  font-style: normal;
  font-size: 12px;
  font-weight: 950;
}

.lesson-card {
  overflow: hidden;
}

.lesson-head {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  background: var(--panel-2);
  border-bottom: 1px solid var(--line);
  padding: 16px;
}

.num {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--green-soft);
  color: var(--primary);
  font-size: 18px;
  font-weight: 950;
  border: 2px solid rgba(45, 212, 191, .24);
}

.lesson-card.done .num {
  background: var(--primary);
  color: #06211f;
}

.lesson-head h3,
.exam-head h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.2;
}

.lesson-head p,
.exam-head p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 9px;
  border-radius: 999px;
  background: var(--green-soft);
  color: var(--primary-2);
  border: 1px solid rgba(45, 212, 191, .22);
  font-size: 12px;
  font-weight: 850;
  white-space: nowrap;
}

.lesson-body,
.exam-body {
  padding: 16px;
  display: grid;
  gap: 13px;
}

.complete-row,
.mastery-row {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  align-items: start;
  color: var(--primary-2);
  background: var(--green-soft);
  border: 1px solid rgba(45, 212, 191, .22);
  border-radius: var(--radius);
  padding: 11px 12px;
  font-size: 14px;
  line-height: 1.35;
  font-weight: 760;
}

.complete-row input,
.mastery-row input,
.option input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  margin: 0;
}

.study-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

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

.study-box h4,
.note strong {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--ink);
  text-transform: uppercase;
}

.study-box p,
.study-box li,
.note,
.question p,
.rubric li,
.feedback {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.43;
}

.study-box p,
.question p {
  margin: 0;
}

.study-box ul,
.rubric {
  margin: 0;
  padding-left: 18px;
}

.code {
  margin: 0;
  background: #020617;
  color: #e2e8f0;
  border-radius: var(--radius);
  padding: 12px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.45;
}

code { font-family: Consolas, "Courier New", monospace; }

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.note.visual {
  background: var(--blue-soft);
  color: var(--blue);
  border-color: rgba(96, 165, 250, .24);
}

.note.trap {
  background: var(--red-soft);
  color: var(--red);
  border-color: rgba(251, 113, 133, .24);
}

.note.practice {
  background: var(--amber-soft);
  color: var(--amber);
  border-color: rgba(245, 158, 11, .24);
}

.mastery {
  display: grid;
  gap: 8px;
}

.mastery-row {
  background: var(--panel-2);
  color: var(--muted);
  border-color: var(--line);
  font-weight: 650;
}

.exam-card {
  overflow: hidden;
}

.exam-group {
  display: grid;
  gap: 14px;
}

.exam-group + .exam-group {
  margin-top: 18px;
}

.exam-group-head {
  padding-top: 4px;
}

.exam-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}

.score-pill {
  text-align: right;
  min-width: 150px;
  color: var(--primary);
  font-weight: 950;
}

.question {
  display: grid;
  gap: 10px;
}

.question-set {
  display: grid;
  gap: 10px;
}

.question-set + .question-set {
  padding-top: 4px;
}

.question-set-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  min-height: 34px;
  padding: 0 2px;
}

.question-set-head strong {
  font-size: 14px;
  text-transform: uppercase;
}

.question-set-head span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.question h4 {
  margin: 0;
  font-size: 15px;
  line-height: 1.35;
}

.options {
  display: grid;
  gap: 7px;
}

.option {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 8px;
  align-items: start;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 9px;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  line-height: 1.36;
}

.option.correct {
  border-color: rgba(45, 212, 191, .42);
  background: var(--green-soft);
  color: var(--primary-2);
}

.option.wrong {
  border-color: rgba(251, 113, 133, .42);
  background: var(--red-soft);
  color: var(--red);
}

.feedback {
  display: none;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 10px;
}

.feedback.show {
  display: block;
}

.feedback.ok {
  color: var(--primary-2);
  background: var(--green-soft);
  border-color: rgba(45, 212, 191, .22);
}

.feedback.bad {
  color: var(--red);
  background: var(--red-soft);
  border-color: rgba(251, 113, 133, .22);
}

.ai-grade {
  display: none;
  border-radius: var(--radius);
  background: var(--blue-soft);
  color: var(--blue);
  border: 1px solid rgba(96, 165, 250, .25);
  padding: 12px;
  font-size: 13px;
  line-height: 1.45;
}

.ai-grade.show {
  display: block;
}

.ai-grade strong {
  color: inherit;
}

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

.mini-btn {
  min-height: 36px;
  padding: 0 12px;
}

.primary {
  min-height: 38px;
  padding: 0 14px;
}

.review-panel {
  padding: 16px;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

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

.review-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.review-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.empty-state {
  padding: 18px;
  color: var(--muted);
}

.page-content {
  display: grid;
  gap: 18px;
}

.page-head {
  display: grid;
  gap: 8px;
  margin-bottom: 2px;
}

.page-head h2 {
  margin: 0;
  font-size: 30px;
  line-height: 1.12;
}

.page-head p {
  margin: 0;
  max-width: 780px;
  color: var(--muted);
  line-height: 1.45;
}

.back-link {
  width: fit-content;
  color: var(--primary-2);
  text-decoration: none;
  font-size: 13px;
  font-weight: 900;
}

.back-link::before {
  content: "< ";
}

.dashboard-grid.compact {
  margin-bottom: 4px;
}

.trail-board {
  position: relative;
  display: grid;
  gap: 18px;
  max-width: 900px;
  margin: 4px auto 0;
  padding: 8px 0 12px;
}

.trail-board::before {
  content: "";
  position: absolute;
  top: 20px;
  bottom: 20px;
  left: 34px;
  width: 4px;
  border-radius: 999px;
  background: var(--line);
}

.trail-node {
  position: relative;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

.trail-dot {
  z-index: 1;
  width: 68px;
  height: 68px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--panel);
  border: 4px solid var(--line);
  color: var(--muted);
  font-weight: 950;
  box-shadow: var(--shadow);
}

.trail-node.current .trail-dot {
  border-color: var(--primary);
  color: var(--primary-2);
  background: var(--green-soft);
}

.trail-node.done .trail-dot {
  border-color: transparent;
  background: var(--primary);
  color: #06211f;
  font-size: 13px;
}

.trail-card,
.module-hero,
.step-card,
.lesson-page-card,
.exam-index-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.trail-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 150px auto;
  gap: 16px;
  align-items: center;
  padding: 16px;
}

.trail-card span,
.module-hero span,
.step-body small,
.exam-index-card > span {
  display: inline-block;
  color: var(--primary);
  font-size: 12px;
  font-weight: 950;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.trail-card h3,
.module-hero h3,
.step-body h3,
.lesson-page-top h3,
.exam-index-card h3 {
  margin: 0;
  line-height: 1.18;
}

.trail-card p,
.module-hero p,
.step-body p,
.lesson-page-top p,
.exam-index-card p {
  margin: 7px 0 0;
  color: var(--muted);
  line-height: 1.42;
}

.trail-card-meta {
  display: grid;
  gap: 4px;
  text-align: right;
}

.trail-card-meta strong {
  color: var(--primary-2);
  font-size: 26px;
  line-height: 1;
}

.trail-card-meta small,
.step-body em,
.exam-index-meta small {
  color: var(--muted);
  font-style: normal;
  font-size: 12px;
  line-height: 1.35;
}

.trail-actions {
  display: flex;
  justify-content: flex-end;
}

.link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 126px;
  min-height: 40px;
  padding: 0 14px;
  text-decoration: none;
  line-height: 1.2;
}

.module-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  gap: 18px;
  align-items: center;
  padding: 18px;
  background:
    linear-gradient(135deg, rgba(45, 212, 191, .10), transparent 52%),
    var(--panel);
}

.step-path {
  display: grid;
  gap: 12px;
  max-width: 900px;
}

.step-card {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 14px;
}

.step-card.done {
  border-color: rgba(45, 212, 191, .42);
}

.step-rail span {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 2px solid var(--line);
  background: var(--panel-2);
  color: var(--muted);
  font-size: 13px;
  font-weight: 950;
}

.step-card.done .step-rail span {
  border-color: transparent;
  background: var(--primary);
  color: #06211f;
}

.step-body em {
  display: block;
  margin-top: 8px;
}

.lesson-page-card {
  display: grid;
  gap: 14px;
  padding: 16px;
}

.lesson-page-top {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding-bottom: 4px;
}

.lesson-page-card.done {
  border-color: rgba(45, 212, 191, .42);
}

.lesson-full {
  display: grid;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  padding: 14px;
}

.lesson-full-head {
  display: grid;
  gap: 4px;
}

.lesson-full-head span,
.worked-example span {
  color: var(--primary);
  font-size: 12px;
  font-weight: 950;
  text-transform: uppercase;
}

.lesson-full-head h4,
.worked-example h4,
.deep-section h4 {
  margin: 0;
  line-height: 1.2;
}

.lesson-objectives,
.exam-focus {
  border-radius: var(--radius);
  border: 1px solid rgba(45, 212, 191, .22);
  background: var(--green-soft);
  color: var(--primary-2);
  padding: 12px;
}

.lesson-objectives strong,
.exam-focus strong,
.drill-card strong {
  display: block;
  margin-bottom: 8px;
}

.lesson-objectives ul,
.exam-focus ul,
.worked-example ul,
.deep-section ul {
  margin: 0;
  padding-left: 19px;
}

.lesson-objectives li,
.exam-focus li,
.worked-example li,
.deep-section li,
.deep-section p,
.drill-card p {
  font-size: 14px;
  line-height: 1.48;
}

.lesson-sections {
  display: grid;
  gap: 12px;
}

.deep-section {
  display: grid;
  gap: 9px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.deep-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.deep-section p,
.drill-card p {
  margin: 0;
  color: var(--muted);
}

.worked-example {
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.drill-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

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

.lesson-videos {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  padding: 14px;
}

.lesson-videos-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: end;
}

.lesson-videos-head span {
  display: inline-block;
  color: var(--primary);
  font-size: 12px;
  font-weight: 950;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.lesson-videos-head h4 {
  margin: 0;
  line-height: 1.2;
}

.lesson-videos-head strong {
  color: var(--primary-2);
  font-size: 22px;
  white-space: nowrap;
}

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

.video-card {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-height: 50px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: inherit;
  text-decoration: none;
}

.video-card:hover {
  border-color: rgba(45, 212, 191, .45);
}

.video-card span {
  display: inline-flex;
  justify-content: center;
  padding: 5px 7px;
  border-radius: 999px;
  background: var(--green-soft);
  color: var(--primary-2);
  font-size: 12px;
  font-weight: 900;
}

.video-card strong {
  font-size: 14px;
  line-height: 1.32;
}

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

.exam-index-card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 16px;
}

.exam-index-meta {
  display: grid;
  gap: 4px;
  padding: 10px;
  border-radius: var(--radius);
  background: var(--panel-2);
}

.exam-index-meta strong {
  color: var(--primary-2);
}

.exam-card.single {
  max-width: 980px;
}

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

@media (max-width: 1100px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

  .workspace {
    padding: 18px;
  }

  .topbar,
  .lesson-head,
  .exam-head,
  .trail-card,
  .module-hero,
  .step-card,
  .lesson-videos-head {
    grid-template-columns: 1fr;
  }

  .chips,
  .score-pill,
  .trail-card-meta,
  .trail-actions {
    justify-content: flex-start;
    text-align: left;
  }

  .dashboard-grid,
  .schedule-grid,
  .schedule-grid.paged,
  .exam-index-grid,
  .drill-grid,
  .module-head,
  .module-goal,
  .module-content,
  .study-grid,
  .note-grid,
  .review-grid {
    grid-template-columns: 1fr;
  }

  .module-progress {
    text-align: left;
  }

  .module-evaluations {
    position: static;
  }

  .trail-board::before {
    left: 25px;
  }

  .trail-node {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .trail-dot {
    width: 52px;
    height: 52px;
    border-width: 3px;
  }

  .step-rail span {
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 640px) {
  .auth-shell {
    padding: 14px;
  }

  .auth-card {
    padding: 18px;
  }

  .auth-card h1 {
    font-size: 24px;
  }

  .topbar h1 {
    font-size: 28px;
  }

  .page-head h2 {
    font-size: 24px;
  }

  .side-nav {
    grid-template-columns: 1fr;
  }

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

  .workspace {
    padding-bottom: calc(24px + env(safe-area-inset-bottom));
  }

  .trail-card,
  .module-hero,
  .step-card,
  .lesson-page-card,
  .exam-index-card {
    padding: 13px;
  }

  .link-btn {
    width: 100%;
  }

  .lesson-videos-head {
    display: grid;
    align-items: start;
  }

  .video-card {
    grid-template-columns: 1fr;
  }

  .video-card span {
    width: fit-content;
  }
}