:root {
  color-scheme: dark;
  --bg: #0f172a;
  --paper: #162033;
  --surface: #1e293b;
  --surface-soft: #111827;
  --ink: #e5e7eb;
  --muted: #a8b3c7;
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --accent: #fbbf24;
  --success: #4ade80;
  --danger: #f87171;
  --line: #334155;
  --shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
  --body-bg: radial-gradient(circle at top left, rgba(96, 165, 250, 0.22), transparent 32rem), radial-gradient(circle at bottom right, rgba(251, 191, 36, 0.12), transparent 28rem), linear-gradient(135deg, #0f172a 0%, #111827 52%, #020617 100%);
  --card-bg: rgba(22, 32, 51, 0.92);
  --form-bg: var(--surface-soft);
  --session-bg: rgba(15, 23, 42, 0.78);
  --button-text: #07111f;
  --button-shadow: rgba(96, 165, 250, 0.2);
  --focus-ring: rgba(96, 165, 250, 0.16);
  --progress-track: #263347;
  --exercise-active-bg: #172b46;
  --exercise-locked-bg: #182234;
  --exercise-locked-number-bg: #475569;
  --exercise-number-text: #07111f;
  --badge-text: #fde68a;
  --badge-bg: rgba(251, 191, 36, 0.14);
  --danger-text: #230808;
  --danger-hover: #ef4444;
  --danger-shadow: rgba(248, 113, 113, 0.18);
  --hint-bg: rgba(251, 191, 36, 0.1);
  --editor-text: #dbeafe;
  --editor-bg: #020617;
  --feedback-bg: var(--surface-soft);
  --success-feedback-text: #bbf7d0;
  --success-feedback-bg: rgba(34, 197, 94, 0.14);
  --error-feedback-text: #fecaca;
  --error-feedback-bg: rgba(248, 113, 113, 0.14);
  --output-bg: #0f172a;
  --output-title-bg: #1e293b;
  --output-title-text: #bfdbfe;
  --pre-text: #e2e8f0;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f4efe4;
  --paper: #fffaf0;
  --surface: #fffaf0;
  --surface-soft: #ffffff;
  --ink: #1f2937;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #f59e0b;
  --success: #15803d;
  --danger: #b91c1c;
  --line: #d8ccb7;
  --shadow: 0 20px 45px rgba(31, 41, 55, 0.12);
  --body-bg: radial-gradient(circle at top left, rgba(245, 158, 11, 0.25), transparent 32rem), linear-gradient(135deg, #f4efe4 0%, #e7f0ff 100%);
  --card-bg: rgba(255, 250, 240, 0.92);
  --form-bg: #ffffff;
  --session-bg: rgba(255, 255, 255, 0.78);
  --button-text: #ffffff;
  --button-shadow: rgba(37, 99, 235, 0.22);
  --focus-ring: rgba(37, 99, 235, 0.12);
  --progress-track: #e2e8f0;
  --exercise-active-bg: #eff6ff;
  --exercise-locked-bg: #f1f5f9;
  --exercise-locked-number-bg: #94a3b8;
  --exercise-number-text: #ffffff;
  --badge-text: #92400e;
  --badge-bg: #fef3c7;
  --danger-text: #ffffff;
  --danger-hover: #991b1b;
  --danger-shadow: rgba(185, 28, 28, 0.18);
  --hint-bg: #fff7ed;
  --editor-text: #dbeafe;
  --editor-bg: #111827;
  --feedback-bg: #f8fafc;
  --success-feedback-text: #14532d;
  --success-feedback-bg: #dcfce7;
  --error-feedback-text: #7f1d1d;
  --error-feedback-bg: #fee2e2;
  --output-bg: #0f172a;
  --output-title-bg: #1e293b;
  --output-title-text: #bfdbfe;
  --pre-text: #e2e8f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Atkinson Hyperlegible", system-ui, sans-serif;
  background: var(--body-bg);
}

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

button {
  border: 0;
  border-radius: 999px;
  padding: 0.85rem 1.2rem;
  color: var(--button-text);
  font-weight: 700;
  background: var(--primary);
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

button:hover {
  background: var(--primary-dark);
  box-shadow: 0 10px 18px var(--button-shadow);
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  transform: none;
}

.app-shell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.hero-card,
.app-header,
.progress-card,
.exercise-list,
.workspace {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.hero-card {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: end;
  padding: clamp(1.5rem, 4vw, 3rem);
}

.app-header {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.admin-header {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  justify-content: space-between;
}

.app-header h1 {
  max-width: none;
  font-size: clamp(2rem, 5vw, 3.8rem);
}

.login-shell {
  display: grid;
  align-content: center;
  min-height: 100vh;
}

.login-link-row {
  margin: 1rem 0;
  text-align: right;
}

.text-link {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
}

.text-link:hover {
  text-decoration: underline;
}

.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 20;
  display: inline-flex;
  gap: 0.55rem;
  align-items: center;
  border: 1px solid var(--line);
  padding: 0.65rem 0.95rem;
  color: var(--ink);
  font-size: 0.9rem;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.theme-toggle:hover {
  color: var(--ink);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.theme-switch {
  display: inline-flex;
  align-items: center;
  width: 2.25rem;
  height: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.12rem;
  background: var(--surface-soft);
}

.theme-switch span {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: var(--primary);
  transition: transform 0.18s ease;
}

.theme-toggle[data-active-theme="light"] .theme-switch span {
  transform: translateX(0.95rem);
}

.eyebrow {
  margin: 0 0 0.4rem;
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 0.8rem;
  font-size: clamp(2.2rem, 7vw, 5rem);
  line-height: 0.92;
  letter-spacing: -0.06em;
}

h2 {
  margin-bottom: 0.5rem;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1;
}

.hero-text {
  max-width: 650px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.12rem;
}

.student-form {
  display: grid;
  gap: 0.55rem;
  padding: 1rem;
  border-radius: 22px;
  background: var(--form-bg);
}

.student-form label,
.editor-label {
  font-weight: 700;
}

.student-form small {
  color: var(--muted);
}

.admin-grid {
  display: grid;
  grid-template-columns: minmax(280px, 420px) 1fr;
  gap: 1.2rem;
  margin: 1.2rem 0;
}

.admin-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 1.25rem;
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.summary-card {
  display: grid;
  align-content: center;
  gap: 0.6rem;
}

.summary-card p,
.summary-card h2 {
  margin-bottom: 0;
}

.admin-course-map-card {
  margin-bottom: 1.2rem;
}

.admin-course-filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
}

.admin-course-filter {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 1rem;
  color: var(--ink);
  text-align: left;
  background: var(--surface-soft);
}

.admin-course-filter:hover,
.admin-course-filter.active {
  border-color: var(--primary);
  color: var(--ink);
  background: var(--exercise-active-bg);
  box-shadow: none;
}

.course-filter-orb {
  display: grid;
  place-items: center;
  width: 4.6rem;
  height: 4.6rem;
  border-radius: 50%;
  color: var(--button-text);
  font-size: 1.15rem;
  font-weight: 700;
  background: radial-gradient(circle at 30% 25%, var(--accent), var(--primary));
  box-shadow: 0 14px 28px var(--button-shadow);
}

.course-filter-content {
  display: grid;
  gap: 0.2rem;
}

.course-filter-content small,
.course-filter-content span {
  color: var(--muted);
}

.input-row {
  display: flex;
  gap: 0.6rem;
}

input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.85rem 1rem;
  color: var(--ink);
  background: var(--surface-soft);
  outline: none;
}

input + input,
input + select,
select + input {
  margin-top: 0.55rem;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--focus-ring);
}

.course-shell {
  display: grid;
  align-content: start;
  min-height: 100vh;
}

.course-welcome-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.course-welcome-card h2 {
  max-width: 760px;
  font-size: clamp(1.7rem, 4vw, 3rem);
}

.course-welcome-card p {
  color: var(--muted);
  font-size: 1.08rem;
}

.course-map-card,
.activity-intro-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.course-map-card {
  margin-bottom: 1.2rem;
}

.course-map {
  display: grid;
  gap: 1rem;
}

.partial-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 1.2rem;
  background: var(--surface-soft);
}

.topic-list {
  display: grid;
  gap: 1rem;
}

.topic-card {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 1.2rem;
  align-items: center;
}

.topic-orb {
  display: grid;
  place-items: center;
  width: 170px;
  height: 170px;
  border: 2px solid var(--primary);
  border-radius: 50%;
  padding: 1rem;
  color: var(--button-text);
  text-align: center;
  background: radial-gradient(circle at 30% 25%, var(--accent), var(--primary));
  box-shadow: 0 18px 35px var(--button-shadow);
}

.topic-orb span {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.15;
}

.topic-details h3 {
  margin: 0 0 0.35rem;
  font-size: 1.5rem;
}

.topic-details p {
  color: var(--muted);
}

.activity-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

.activity-card {
  display: grid;
  gap: 0.25rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1rem;
  color: var(--ink);
  text-align: left;
  background: var(--card-bg);
}

.activity-card:hover {
  border-color: var(--primary);
  color: var(--ink);
  background: var(--exercise-active-bg);
  box-shadow: none;
}

.activity-card span,
.activity-card small {
  color: var(--muted);
}

.activity-card strong {
  font-size: 1.1rem;
}

.activity-intro-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.2rem;
}

.activity-intro-card[hidden],
.typing-grid[hidden],
.file-activity-card[hidden] {
  display: none;
}

.activity-intro-card p {
  max-width: 780px;
  color: var(--muted);
}

.file-activity-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.file-activity-form {
  display: grid;
  gap: 0.85rem;
}

.file-activity-form label {
  font-weight: 700;
}

.image-preview-card {
  display: grid;
  gap: 1rem;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1rem;
  background: var(--surface-soft);
}

.image-preview-card[hidden] {
  display: none;
}

.image-preview-card a {
  display: block;
  overflow-wrap: anywhere;
}

.activity-external-link {
  display: inline-block;
  margin-top: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.7rem 1rem;
  font-weight: 700;
  background: var(--form-bg);
}

.activity-external-link:hover {
  border-color: var(--primary);
  background: var(--exercise-active-bg);
}

.activity-link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.75rem;
}

.activity-steps {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1rem 1rem 1rem 2.2rem;
  color: var(--ink);
  background: var(--surface-soft);
}

.activity-steps li + li {
  margin-top: 0.45rem;
}

.agenda-guide,
.agenda-example {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1rem;
  background: var(--surface-soft);
}

.agenda-guide h3,
.agenda-example h3 {
  margin-bottom: 0.6rem;
}

.agenda-guide ul {
  margin: 0;
  padding-left: 1.25rem;
}

.agenda-guide li + li {
  margin-top: 0.35rem;
}

.agenda-example p {
  margin-bottom: 0;
}

.agenda-input {
  min-height: 220px;
}

.shortcut-workspace {
  gap: 0.9rem;
}

.shortcut-skill {
  display: inline-block;
  width: fit-content;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.5rem 0.8rem;
  color: var(--primary);
  font-weight: 700;
  background: var(--surface-soft);
}

.shortcut-reference-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1rem;
  background: var(--surface-soft);
}

.shortcut-typing-aid {
  display: grid;
  gap: 0.8rem;
}

.shortcut-typing-aid[hidden] {
  display: none;
}

.shortcut-typing-aid .typing-target {
  margin: 0.25rem 0;
  padding: 0.85rem;
}

.shortcut-typing-aid .target-text {
  gap: 0.16rem;
  font-size: clamp(0.95rem, 2.2vw, 1.35rem);
  line-height: 1.45;
}

.shortcut-typing-aid .target-character {
  min-width: 0.5em;
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0 0.04em;
}

.shortcut-reference-card[hidden],
.shortcut-targets[hidden],
.shortcut-input[hidden],
.editor-label[hidden] {
  display: none;
}

.shortcut-source-input,
.shortcut-input,
.shortcut-target-input {
  min-height: 120px;
}

.shortcut-targets {
  display: grid;
  gap: 0.75rem;
}

.shortcut-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.shortcut-action-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.7rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
  background: var(--form-bg);
}

.shortcut-action-pill.done {
  border-color: var(--success);
  color: var(--success-feedback-text);
  background: var(--success-feedback-bg);
}

.progress-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.25rem;
  align-items: center;
  margin: 1.2rem 0;
  padding: 1.25rem;
}

.session-card {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin: 1.2rem 0;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 0.85rem 1rem;
  background: var(--session-bg);
}

.session-card[hidden] {
  display: none;
}

#sessionText {
  color: var(--muted);
  font-weight: 700;
}

.progress-card h2,
.progress-card p {
  margin-bottom: 0;
}

.progress-meter {
  overflow: hidden;
  height: 16px;
  border-radius: 999px;
  background: var(--progress-track);
}

.progress-meter div {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--success));
  transition: width 0.25s ease;
}

.content-grid {
  display: grid;
  grid-template-columns: 330px 1fr;
  gap: 1.2rem;
  align-items: start;
}

.exercise-list,
.workspace {
  padding: 1.25rem;
}

.workspace.locked {
  opacity: 0.62;
}

.exercise-buttons {
  display: grid;
  gap: 0.75rem;
}

.exercise-button {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  width: 100%;
  border: 1px solid transparent;
  border-radius: 18px;
  padding: 0.85rem;
  color: var(--ink);
  text-align: left;
  background: var(--form-bg);
}

.exercise-button:hover,
.exercise-button.active {
  border-color: var(--primary);
  color: var(--ink);
  background: var(--exercise-active-bg);
  box-shadow: none;
}

.exercise-button.locked,
.exercise-button.locked:hover {
  border-color: transparent;
  color: var(--muted);
  background: var(--exercise-locked-bg);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.exercise-button.locked .exercise-number {
  background: var(--exercise-locked-number-bg);
}

.exercise-number {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  color: var(--exercise-number-text);
  font-weight: 700;
  background: var(--primary);
}

.exercise-name {
  font-weight: 700;
}

.exercise-status {
  color: var(--success);
  font-weight: 700;
}

.exercise-header {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  justify-content: space-between;
}

.badge {
  display: inline-block;
  margin-bottom: 0.6rem;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  color: var(--badge-text);
  font-size: 0.85rem;
  font-weight: 700;
  background: var(--badge-bg);
}

.ghost-button {
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--form-bg);
}

.ghost-button:hover {
  color: var(--ink);
  background: var(--surface);
  box-shadow: none;
}

.danger-button {
  background: var(--danger);
  color: var(--danger-text);
}

.danger-button:hover {
  background: var(--danger-hover);
  box-shadow: 0 10px 18px var(--danger-shadow);
}

.instruction {
  color: var(--muted);
  font-size: 1.08rem;
}

.hint-box {
  margin: 1rem 0;
  border-left: 5px solid var(--accent);
  border-radius: 16px;
  padding: 0.9rem 1rem;
  background: var(--hint-bg);
}

.editor-label {
  display: block;
  margin-bottom: 0.5rem;
}

.code-editor {
  width: 100%;
  min-height: 230px;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1rem;
  color: var(--editor-text);
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 1rem;
  line-height: 1.6;
  background: var(--editor-bg);
  outline: none;
  resize: vertical;
}

.typing-grid {
  grid-template-columns: 300px 1fr;
}

.typing-target {
  margin: 1rem 0;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1rem;
  background: var(--form-bg);
}

.typing-target .eyebrow {
  margin-bottom: 0.75rem;
}

.target-text {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: clamp(1.6rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.3;
}

.target-character {
  min-width: 0.65em;
  border-bottom: 3px solid transparent;
  border-radius: 8px;
  padding: 0 0.08em;
}

.target-character.done {
  color: var(--success);
  background: var(--success-feedback-bg);
}

.target-character.error {
  color: var(--error-feedback-text);
  background: var(--error-feedback-bg);
}

.target-character.current {
  border-bottom-color: var(--accent);
  background: var(--hint-bg);
}

.typing-input {
  width: 100%;
  min-height: 110px;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1rem;
  color: var(--ink);
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 1.25rem;
  line-height: 1.5;
  background: var(--surface-soft);
  outline: none;
  resize: vertical;
}

.typing-status {
  margin: 0.75rem 0;
  color: var(--muted);
  font-weight: 700;
}

.keyboard-panel {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1rem;
  background: var(--surface-soft);
}

.visual-keyboard {
  display: grid;
  gap: 0.5rem;
}

.keyboard-row {
  display: flex;
  justify-content: center;
  gap: 0.45rem;
}

.keyboard-key {
  display: grid;
  place-items: center;
  min-width: 2.35rem;
  min-height: 2.35rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.45rem 0.6rem;
  color: var(--ink);
  font-family: "JetBrains Mono", Consolas, monospace;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--card-bg);
}

.keyboard-key.wide {
  width: min(100%, 16rem);
}

.keyboard-key.active {
  border-color: var(--accent);
  color: var(--button-text);
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--hint-bg);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1rem 0;
}

.feedback {
  min-height: 3rem;
  border-radius: 18px;
  padding: 0.95rem 1rem;
  color: var(--muted);
  background: var(--feedback-bg);
}

.feedback.success {
  color: var(--success-feedback-text);
  background: var(--success-feedback-bg);
}

.feedback.error {
  color: var(--error-feedback-text);
  background: var(--error-feedback-bg);
}

.output-panel {
  overflow: hidden;
  border-radius: 20px;
  background: var(--output-bg);
}

.output-title {
  padding: 0.8rem 1rem;
  color: var(--output-title-text);
  font-weight: 700;
  background: var(--output-title-bg);
}

pre {
  min-height: 90px;
  margin: 0;
  padding: 1rem;
  color: var(--pre-text);
  white-space: pre-wrap;
  font-family: "JetBrains Mono", Consolas, monospace;
}

.table-header {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.filter-control {
  display: grid;
  gap: 0.35rem;
  min-width: 240px;
  color: var(--muted);
  font-weight: 700;
}

.filter-control select {
  margin: 0;
}

.table-wrap {
  overflow-x: auto;
}

.admin-table {
  border-collapse: separate;
  border-spacing: 0 0.75rem;
}

.admin-table th,
.admin-table td {
  border-bottom: 0;
}

.student-table-row td {
  background: var(--surface-soft);
}

.student-table-row td:first-child {
  border-radius: 20px 0 0 20px;
}

.student-table-row td:last-child {
  border-radius: 0 20px 20px 0;
}

.student-name-cell {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: center;
}

.student-avatar {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  color: var(--button-text);
  font-weight: 700;
  background: var(--primary);
}

.course-select {
  min-width: 180px;
}

.student-progress-cell {
  display: grid;
  gap: 0.4rem;
  min-width: 150px;
}

.mini-progress {
  overflow: hidden;
  height: 0.55rem;
  border-radius: 999px;
  background: var(--progress-track);
}

.mini-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--success));
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 0.85rem;
  text-align: left;
  vertical-align: middle;
}

th {
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.table-input {
  min-width: 220px;
  border-radius: 14px;
}

.table-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.password-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.table-actions button,
.password-actions button {
  padding: 0.65rem 0.85rem;
}

.password-input {
  min-width: 180px;
}

.muted-text {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.progress-detail-link {
  display: inline-block;
  margin-top: 0.65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  background: var(--form-bg);
}

.progress-detail-link:hover {
  border-color: var(--primary);
  background: var(--exercise-active-bg);
}

.student-progress-detail {
  display: grid;
  gap: 1.2rem;
  margin-bottom: 1.2rem;
}

.student-overview-card {
  display: grid;
  grid-template-columns: minmax(280px, 0.85fr) 1fr;
  gap: 1.4rem;
  align-items: center;
  margin: 1.2rem 0;
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.student-overview-main {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: center;
}

.student-overview-avatar {
  display: grid;
  place-items: center;
  width: clamp(5rem, 12vw, 7rem);
  height: clamp(5rem, 12vw, 7rem);
  border: 2px solid var(--primary);
  border-radius: 50%;
  color: var(--button-text);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  background: radial-gradient(circle at 30% 25%, var(--accent), var(--primary));
  box-shadow: 0 18px 35px var(--button-shadow);
}

.student-overview-main h2,
.student-overview-main p,
.student-overview-progress p {
  margin-bottom: 0;
}

.student-overview-meta {
  color: var(--muted);
  font-weight: 700;
}

.student-overview-progress {
  display: grid;
  gap: 0.8rem;
}

.student-overview-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.student-overview-stats span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  color: var(--ink);
  font-weight: 700;
  background: var(--surface-soft);
}

.partial-progress-card,
.topic-progress-card,
.activity-progress-card,
.exercise-review-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 1.2rem;
}

.partial-progress-card {
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.partial-progress-header {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.partial-progress-header h2 {
  margin-bottom: 0;
}

.partial-progress-summary,
.activity-summary-pill {
  display: grid;
  place-items: center;
  min-width: 5.2rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 0.65rem;
  text-align: center;
  background: var(--surface-soft);
}

.partial-progress-summary strong,
.activity-summary-pill strong {
  color: var(--success);
  font-size: 1.25rem;
}

.partial-progress-summary span,
.activity-summary-pill span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.topic-progress-card,
.activity-progress-card,
.exercise-review-card {
  background: var(--surface-soft);
}

.activity-progress-card,
.exercise-review-card {
  position: relative;
  overflow: hidden;
}

.activity-progress-card::before,
.exercise-review-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: linear-gradient(var(--primary), var(--accent));
}

.topic-progress-heading {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.topic-progress-orb {
  display: grid;
  place-items: center;
  width: 4.25rem;
  height: 4.25rem;
  border-radius: 50%;
  color: var(--button-text);
  font-weight: 700;
  background: radial-gradient(circle at 30% 25%, var(--accent), var(--primary));
}

.topic-progress-card + .topic-progress-card,
.activity-progress-card + .activity-progress-card,
.exercise-review-card + .exercise-review-card {
  margin-top: 1rem;
}

.activity-progress-list,
.exercise-review-list {
  display: grid;
  gap: 1rem;
}

.activity-progress-header {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  justify-content: space-between;
}

.activity-header-actions {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
  justify-content: flex-end;
}

.activity-toggle-button {
  padding: 0.45rem 0.75rem;
  font-size: 0.82rem;
}

.activity-progress-body {
  margin-top: 1rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.activity-progress-body[hidden] {
  display: none;
}

.activity-progress-card.expanded,
.exercise-review-card.expanded {
  border-color: var(--primary);
}

.activity-progress-header h4,
.topic-progress-card h3 {
  margin: 0 0 0.4rem;
}

.review-status {
  flex: 0 0 auto;
  border-radius: 999px;
  padding: 0.4rem 0.7rem;
  font-size: 0.82rem;
  font-weight: 700;
}

.review-status.success {
  color: var(--success-feedback-text);
  background: var(--success-feedback-bg);
}

.review-status.pending {
  color: var(--error-feedback-text);
  background: var(--error-feedback-bg);
}

.submission-fields {
  display: grid;
  gap: 0.45rem;
  margin: 1rem 0 0;
}

.submission-fields dt {
  color: var(--primary);
  font-weight: 700;
}

.submission-fields dd {
  margin: 0 0 0.65rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.85rem;
  overflow-wrap: anywhere;
  background: var(--card-bg);
}

.submission-code-block {
  display: grid;
  gap: 0.6rem;
  margin-top: 1rem;
}

.submission-code-block pre {
  border-radius: 18px;
  background: var(--editor-bg);
}

@media (max-width: 900px) {
  .hero-card,
  .app-header,
  .progress-card,
  .student-overview-card,
  .admin-grid,
  .content-grid,
  .typing-grid {
    grid-template-columns: 1fr;
  }

  .admin-header {
    flex-direction: column;
  }

  .table-header {
    align-items: stretch;
    flex-direction: column;
  }

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

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

  .activity-intro-card {
    flex-direction: column;
  }

  .activity-progress-header {
    flex-direction: column;
  }

  .partial-progress-header {
    flex-direction: column;
  }

  .student-overview-main {
    grid-template-columns: 1fr;
  }

  .student-overview-avatar {
    width: 100%;
    height: auto;
    min-height: 6rem;
    border-radius: 24px;
  }

  .topic-progress-heading {
    grid-template-columns: 1fr;
  }

  .topic-progress-orb {
    width: 100%;
    height: auto;
    min-height: 4.5rem;
    border-radius: 22px;
  }

  .topic-orb {
    width: min(100%, 320px);
    height: auto;
    min-height: 150px;
    border-radius: 28px;
  }

  .filter-control {
    min-width: 0;
  }

  .admin-course-filter {
    grid-template-columns: 1fr;
  }

  .course-filter-orb {
    width: 100%;
    height: auto;
    min-height: 5rem;
    border-radius: 22px;
  }

  .progress-card {
    gap: 0.8rem;
  }
}

@media (max-width: 620px) {
  .app-shell {
    width: min(100% - 1rem, 1180px);
    padding-top: 0.5rem;
  }

  .hero-card,
  .app-header,
  .progress-card,
  .course-map-card,
  .activity-intro-card,
  .file-activity-card,
  .exercise-list,
  .workspace {
    border-radius: 22px;
  }

  .input-row,
  .admin-header,
  .exercise-header {
    flex-direction: column;
  }

  .input-row button,
  .exercise-header button,
  .actions button {
    width: 100%;
  }

  .theme-toggle {
    top: auto;
    right: 0.75rem;
    bottom: 0.75rem;
  }

  .keyboard-panel {
    padding: 0.7rem;
  }

  .keyboard-row {
    gap: 0.25rem;
  }

  .keyboard-key {
    min-width: 1.75rem;
    min-height: 1.9rem;
    border-radius: 9px;
    padding: 0.3rem;
    font-size: 0.78rem;
  }

  .student-name-cell {
    grid-template-columns: 1fr;
  }
}