/* ========================================================
   Vinarky Study — Design System v2
   ======================================================== */

/* --------------------------------------------------------
   1. Reset dasar
   -------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

img,
picture,
svg,
video {
  max-width: 100%;
  display: block;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* --------------------------------------------------------
   2. Design tokens
   -------------------------------------------------------- */

:root {
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-active: #3730a3;
  --color-primary-soft: #eef2ff;
  --color-primary-soft-hover: #e0e7ff;
  --color-primary-border: #c7d2fe;

  --color-bg: #f8fafc;
  --color-bg-secondary: #f1f5f9;
  --color-surface: #ffffff;
  --color-surface-hover: #f8fafc;

  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-dim: #94a3b8;
  --color-text-inverse: #ffffff;

  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  --color-success: #059669;
  --color-success-hover: #047857;
  --color-success-soft: #ecfdf5;
  --color-success-border: #a7f3d0;

  --color-warning: #d97706;
  --color-warning-soft: #fffbeb;
  --color-warning-border: #fde68a;

  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;
  --color-danger-soft: #fef2f2;
  --color-danger-border: #fecaca;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --shadow-xs: 0 1px 2px 0 rgb(15 23 42 / 0.04);
  --shadow-sm: 0 1px 3px 0 rgb(15 23 42 / 0.06), 0 1px 2px -1px rgb(15 23 42 / 0.06);
  --shadow-md: 0 4px 6px -1px rgb(15 23 42 / 0.07), 0 2px 4px -2px rgb(15 23 42 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(15 23 42 / 0.08), 0 4px 6px -4px rgb(15 23 42 / 0.05);
  --shadow-xl: 0 20px 25px -5px rgb(15 23 42 / 0.08), 0 8px 10px -6px rgb(15 23 42 / 0.05);

  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
}

/* --------------------------------------------------------
   3. Layout dasar
   -------------------------------------------------------- */

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.011em;
}

.app-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-main {
  flex-grow: 1;
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
  padding: var(--space-4);
}

.app-footer {
  padding: var(--space-6) var(--space-4);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-dim);
  margin-top: auto;
}

.app-footer p {
  margin: 0;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------
   4. Navbar
   -------------------------------------------------------- */

.app-navbar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.app-navbar-inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--space-4);
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  scrollbar-width: none;
}

.app-navbar-inner::-webkit-scrollbar {
  display: none;
}

.nav-link {
  display: inline-block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-link:hover {
  color: var(--color-text);
}

.nav-link-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* --------------------------------------------------------
   5. Hero header (dashboard)
   -------------------------------------------------------- */

.hero-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  border-radius: var(--radius-lg);
  color: #ffffff;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  margin-bottom: var(--space-6);
}

.hero-header-student {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
}

.hero-header-teacher {
  background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
}

.hero-header-admin {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.hero-header::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-header-content {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.hero-greeting {
  font-size: var(--text-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.75);
  margin: 0 0 var(--space-1);
  letter-spacing: 0.01em;
}

.hero-name {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0 0 var(--space-2);
  word-wrap: break-word;
}

.hero-meta {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.75);
  margin: 0;
  font-family: var(--font-mono);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  position: relative;
  z-index: 1;
}

.hero-actions .btn {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  width: auto;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.hero-actions .btn:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.4);
}

/* --------------------------------------------------------
   6. Landing page
   -------------------------------------------------------- */

.landing {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-8) var(--space-4);
}

.landing-hero {
  max-width: 40rem;
  margin-bottom: var(--space-12);
}

.landing-brand {
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--color-text);
  margin: 0 0 var(--space-3);
  line-height: 1.1;
}

.landing-tagline {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 var(--space-5);
  letter-spacing: -0.01em;
}

.landing-description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.6;
}

.landing-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  width: 100%;
  max-width: 48rem;
}

.landing-card {
  display: block;
  padding: var(--space-8) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.landing-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-border);
}

.landing-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  border-radius: var(--radius-lg);
  margin: 0 auto var(--space-5);
  color: #ffffff;
}

.landing-card-icon-student {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  box-shadow: 0 8px 16px -4px rgb(79 70 229 / 0.3);
}

.landing-card-icon-teacher {
  background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
  box-shadow: 0 8px 16px -4px rgb(8 145 178 / 0.3);
}

.landing-card-title {
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: 0 0 var(--space-3);
}

.landing-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0 0 var(--space-5);
}

.landing-card-cta {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
}

/* ===== dashboard-header & dashboard-username ===== */

.dashboard-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  justify-content: space-between;
}

.dashboard-username {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: var(--space-2) 0 0;
}

@media (min-width: 640px) {
  .dashboard-header {
    flex-direction: row;
    align-items: center;
  }
}

/* --------------------------------------------------------
   7. Auth split layout
   -------------------------------------------------------- */

.auth-layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr;
}

.auth-panel {
  display: none;
  padding: var(--space-12) var(--space-8);
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

.auth-panel::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 150%;
  height: 150%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.auth-panel-student {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
}

.auth-panel-teacher {
  background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
}

.auth-panel-admin {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.auth-panel-brand {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-12);
  position: relative;
  z-index: 1;
}

.auth-panel-brand-name {
  color: #ffffff;
}

.auth-panel-brand-dot {
  color: rgba(255, 255, 255, 0.5);
}

.auth-panel-tagline {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0 0 var(--space-5);
  position: relative;
  z-index: 1;
}

.auth-panel-description {
  font-size: var(--text-base);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.8);
  margin: 0;
  max-width: 24rem;
  position: relative;
  z-index: 1;
}

.auth-panel-back {
  display: inline-block;
  margin-top: auto;
  font-size: var(--text-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.8);
  transition: color 0.15s ease;
  position: absolute;
  bottom: var(--space-8);
  left: var(--space-8);
  z-index: 1;
}

.auth-panel-back:hover {
  color: #ffffff;
}

.auth-form-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  background: var(--color-bg);
  min-height: 100vh;
}

.auth-form-inner {
  width: 100%;
  max-width: 24rem;
}

.auth-form-header {
  margin-bottom: var(--space-8);
}

.auth-form-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin: 0 0 var(--space-2);
}

.auth-form-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
}

/* --------------------------------------------------------
   8. Card
   -------------------------------------------------------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
}

.card-narrow {
  max-width: 28rem;
  margin: var(--space-6) auto 0;
}

.card-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.card-title {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text);
  margin: 0 0 var(--space-1);
  line-height: 1.2;
  word-wrap: break-word;
}

.card-subtitle {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0;
  word-wrap: break-word;
}

.card-header-with-action {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.card-header-with-action .section-title {
  margin: 0;
}

.card-success {
  background: var(--color-success-soft);
  border-color: var(--color-success-border);
}

.success-title {
  color: var(--color-success);
  font-weight: 800;
}

.card-danger {
  background: var(--color-danger-soft);
  border-color: var(--color-danger-border);
}

/* --------------------------------------------------------
   9. Form
   -------------------------------------------------------- */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.form-input:hover:not(:focus) {
  border-color: #94a3b8;
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgb(79 70 229 / 0.12);
}

.form-input::placeholder {
  color: var(--color-text-dim);
}

.form-textarea {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  resize: vertical;
  min-height: 6rem;
  line-height: 1.6;
}

.form-textarea-tall {
  min-height: 14rem;
}

.form-textarea-mono {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.7;
}

.form-file {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  cursor: pointer;
}

.form-file::file-selector-button {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-4);
  margin-right: var(--space-3);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.form-file::file-selector-button:hover {
  background: var(--color-primary-soft-hover);
}

.form-row-2 {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.form-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  user-select: none;
}

.form-checkbox input[type="checkbox"] {
  width: 1.125rem;
  height: 1.125rem;
  accent-color: var(--color-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin: var(--space-2) 0 0;
  line-height: 1.5;
}

/* --------------------------------------------------------
   10. Button
   -------------------------------------------------------- */

.btn {
  display: inline-block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 700;
  font-family: var(--font-sans);
  text-align: center;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: 0 1px 3px 0 rgb(79 70 229 / 0.2), 0 1px 2px -1px rgb(79 70 229 / 0.2);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 8px -1px rgb(79 70 229 / 0.3);
}

.btn-neutral {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}

.btn-neutral:hover {
  background: var(--color-bg-secondary);
  border-color: #94a3b8;
}

.btn-danger {
  background: var(--color-danger);
  color: var(--color-text-inverse);
  box-shadow: 0 1px 3px 0 rgb(220 38 38 / 0.2);
}

.btn-danger:hover {
  background: var(--color-danger-hover);
  box-shadow: 0 4px 8px -1px rgb(220 38 38 / 0.3);
}

.btn-danger-outline {
  background: transparent;
  color: var(--color-danger);
  border: 1px solid var(--color-danger-border);
  width: auto;
  padding: var(--space-2) var(--space-3);
}

.btn-danger-outline:hover {
  background: var(--color-danger-soft);
  border-color: var(--color-danger);
}

.btn-sm {
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
}

.btn-sm-inline {
  width: auto;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  align-self: flex-start;
}

/* --------------------------------------------------------
   11. Alert
   -------------------------------------------------------- */

.alert {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid;
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.alert-danger {
  background: var(--color-danger-soft);
  border-color: var(--color-danger-border);
  color: var(--color-danger);
}

.alert-success {
  background: var(--color-success-soft);
  border-color: var(--color-success-border);
  color: var(--color-success);
}

.alert-warning {
  background: var(--color-warning-soft);
  border-color: var(--color-warning-border);
  color: var(--color-warning);
}

/* --------------------------------------------------------
   12. Form util
   -------------------------------------------------------- */

.logout-form {
  margin-top: var(--space-4);
  max-width: 12rem;
}

.logout-form-inline {
  flex-shrink: 0;
}

.inline-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.inline-form-field {
  flex-grow: 1;
}

/* --------------------------------------------------------
   13. Section title & spacing
   -------------------------------------------------------- */

.section-title {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--color-text);
  margin: 0 0 var(--space-5);
}

.card + .card,
.card + .stat-grid,
.stat-grid + .card,
.empty-state {
  margin-top: var(--space-6);
}

/* --------------------------------------------------------
   14. Stat grid
   -------------------------------------------------------- */

.stat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5) var(--space-6);
}

.stat-value {
  font-size: var(--text-4xl);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* --------------------------------------------------------
   15. Quick actions
   -------------------------------------------------------- */

.quick-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.quick-action {
  display: block;
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.quick-action:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.quick-action:active {
  transform: translateY(0);
}

.quick-action-title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.quick-action-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* --------------------------------------------------------
   16. Class list
   -------------------------------------------------------- */

.class-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.class-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.class-item:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border);
}

.class-item-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.class-item-name {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.class-item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.class-item-meta-item {
  display: inline-flex;
  align-items: center;
}

/* --------------------------------------------------------
   17. User list
   -------------------------------------------------------- */

.user-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.user-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface-hover);
}

.user-item-info {
  min-width: 0;
  flex-grow: 1;
}

.user-item-name {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  word-wrap: break-word;
}

.user-item-username {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* --------------------------------------------------------
   18. Util teks
   -------------------------------------------------------- */

.back-link {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  transition: color 0.15s ease;
}

.back-link:hover {
  color: var(--color-primary);
}

.muted-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

.muted-text-top {
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.muted-text-bottom {
  margin-bottom: var(--space-5);
}

.link {
  color: var(--color-primary);
  font-weight: 600;
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-secondary);
  padding: 0.1em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

/* --------------------------------------------------------
   19. Danger zone
   -------------------------------------------------------- */

.danger-zone {
  border-color: var(--color-danger-border);
}

.danger-title {
  color: var(--color-danger);
}

.danger-zone .btn-danger {
  width: auto;
  padding: var(--space-3) var(--space-6);
  margin-top: var(--space-4);
}

/* --------------------------------------------------------
   20. Empty state
   -------------------------------------------------------- */

.empty-state {
  padding: var(--space-8) var(--space-4);
  text-align: center;
  background: var(--color-surface);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
}

.empty-state-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
  max-width: 32rem;
  margin-left: auto;
  margin-right: auto;
}

/* --------------------------------------------------------
   21. Error page
   -------------------------------------------------------- */

.error-page {
  text-align: center;
}

.error-code {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--color-primary-soft);
  margin-bottom: var(--space-4);
}

.error-title {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text);
  margin: 0 0 var(--space-2);
}

.error-message {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0 0 var(--space-6);
  line-height: 1.5;
}

/* --------------------------------------------------------
   22. Import result
   -------------------------------------------------------- */

.import-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.import-summary-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-4);
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.import-summary-value {
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.import-summary-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-align: center;
}

.generated-passwords {
  margin-top: var(--space-6);
  padding: var(--space-5);
  background: var(--color-warning-soft);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius-md);
}

.generated-passwords-title {
  font-size: var(--text-base);
  font-weight: 800;
  color: var(--color-warning);
  margin: 0 0 var(--space-3);
}

.password-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.password-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.password-item-npm {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.password-item-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.password-item-value {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-warning);
  background: transparent;
  padding: 0;
  margin-top: var(--space-1);
  letter-spacing: 0.05em;
}

.import-failures {
  margin-top: var(--space-6);
  padding: var(--space-5);
  background: var(--color-danger-soft);
  border: 1px solid var(--color-danger-border);
  border-radius: var(--radius-md);
}

.import-failures .generated-passwords-title {
  color: var(--color-danger);
}

.failure-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.failure-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}

.failure-row {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-danger);
}

.failure-msg {
  color: var(--color-text-muted);
}

/* --------------------------------------------------------
   23. Import details (toggle)
   -------------------------------------------------------- */

.import-details {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.import-details-summary {
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  padding: var(--space-2) 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  user-select: none;
}

.import-details-summary::-webkit-details-marker {
  display: none;
}

.import-details-summary::before {
  content: '▸';
  display: inline-block;
  transition: transform 0.15s ease;
  font-size: var(--text-sm);
}

.import-details[open] .import-details-summary::before {
  transform: rotate(90deg);
}

.import-details-summary:hover {
  color: var(--color-primary-hover);
}

.import-details-body {
  margin-top: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.import-details-errors {
  margin-bottom: var(--space-5);
}

/* --------------------------------------------------------
   24. Action row & info list
   -------------------------------------------------------- */

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.action-row .btn {
  width: auto;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-hover);
  border-radius: var(--radius-md);
}

.info-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.info-value {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 600;
  word-wrap: break-word;
}

.info-description {
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.info-description-body {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.6;
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* --------------------------------------------------------
   25. Status badge
   -------------------------------------------------------- */

.status-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  border: 1px solid;
}

.status-draft {
  background: var(--color-bg-secondary);
  border-color: var(--color-border-strong);
  color: var(--color-text-muted);
}

.status-published {
  background: var(--color-success-soft);
  border-color: var(--color-success-border);
  color: var(--color-success);
}

.status-closed {
  background: var(--color-danger-soft);
  border-color: var(--color-danger-border);
  color: var(--color-danger);
}

/* --------------------------------------------------------
   26. Question list (read-only)
   -------------------------------------------------------- */

.question-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.question-item {
  padding: var(--space-5);
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.question-number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.question-score {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.question-text {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.5;
  margin-bottom: var(--space-4);
  word-wrap: break-word;
}

.question-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.question-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}

.question-option-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  font-size: var(--text-xs);
  font-weight: 800;
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.question-option-text {
  flex-grow: 1;
  color: var(--color-text);
  word-wrap: break-word;
}

.question-option-badge {
  font-size: var(--text-base);
  font-weight: 800;
  color: var(--color-success);
  flex-shrink: 0;
}

.question-option-correct {
  background: var(--color-success-soft);
  border-color: var(--color-success-border);
}

.question-option-correct .question-option-label {
  background: var(--color-success);
  color: #ffffff;
}

.question-option-wrong {
  background: var(--color-danger-soft);
  border-color: var(--color-danger-border);
}

.question-option-wrong .question-option-label {
  background: var(--color-danger);
  color: #ffffff;
}

.question-option-wrong .question-option-badge {
  color: var(--color-danger);
}

/* --------------------------------------------------------
   27. Timer & status cards
   -------------------------------------------------------- */

.timer-card {
  text-align: center;
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  border-color: #312e81;
  color: #ffffff;
  box-shadow: var(--shadow-lg);
}

.timer-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: #c7d2fe;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.timer-value {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
  line-height: 1;
}

.timer-card .form-hint {
  color: #c7d2fe;
  margin-top: var(--space-4);
}

/* --------------------------------------------------------
   28. Exam page (take-exam)
   -------------------------------------------------------- */

.exam-page-header {
  margin-bottom: var(--space-6);
}

.exam-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.exam-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  min-width: 0;
}

.exam-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.exam-sidebar {
  order: -1;
  position: sticky;
  top: 3.5rem;
  z-index: 10;
  background: var(--color-bg);
  padding: var(--space-3) 0;
  margin-bottom: var(--space-2);
}

.exam-sidebar-timer {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  text-align: center;
  color: #ffffff;
  box-shadow: var(--shadow-md);
}

.exam-sidebar-timer-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: #c7d2fe;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.exam-sidebar-timer-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
  line-height: 1;
}

.exam-sidebar-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.exam-sidebar-section-title {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.exam-nav-scroll {
  overflow-x: auto;
  scrollbar-width: thin;
}

.exam-nav-scroll::-webkit-scrollbar {
  height: 4px;
}

.exam-nav-scroll::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 10px;
}

.exam-nav-grid {
  display: flex;
  gap: var(--space-2);
  min-width: max-content;
}

.exam-nav-btn {
  width: 2.25rem;
  height: 2.25rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
}

.exam-nav-btn:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary-border);
  color: var(--color-primary);
}

.exam-nav-btn-answered {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.exam-nav-btn-answered:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #ffffff;
}

.exam-submit-desktop {
  display: none;
}

.exam-submit-mobile {
  display: block;
}

/* --------------------------------------------------------
   29. Exam question (interactive)
   -------------------------------------------------------- */

.exam-question {
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  scroll-margin-top: 12rem;
}

.exam-question-saving {
  border-color: var(--color-warning);
  box-shadow: 0 0 0 3px rgb(217 119 6 / 0.1);
}

.exam-question-saved {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px rgb(5 150 105 / 0.1);
}

.exam-question-error {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgb(220 38 38 / 0.1);
}

.exam-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.exam-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.exam-option:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary-border);
}

.exam-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.exam-option-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  font-size: var(--text-xs);
  font-weight: 800;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  flex-shrink: 0;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.exam-option-text {
  flex-grow: 1;
  color: var(--color-text);
  word-wrap: break-word;
}

.exam-option:has(input:checked) {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
}

.exam-option:has(input:checked) .exam-option-label {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

/* --------------------------------------------------------
   30. Result score & feedback
   -------------------------------------------------------- */

.result-score-block {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  margin: var(--space-5) 0;
  border: 1px solid var(--color-success-border);
}

.result-score-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.result-score-value {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-success);
  line-height: 1;
  letter-spacing: -0.03em;
}

.result-score-max {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}

.feedback-block {
  margin-top: var(--space-5);
  padding: var(--space-5);
  background: var(--color-primary-soft);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-md);
}

.feedback-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.feedback-body {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.6;
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* --------------------------------------------------------
   31. Submission list (teacher grading)
   -------------------------------------------------------- */

.submission-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.submission-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.submission-item-info {
  min-width: 0;
  flex-grow: 1;
}

.submission-item-name {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  word-wrap: break-word;
}

.submission-item-username {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.submission-item-time {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

.submission-item-status {
  display: flex;
  align-items: center;
}

.submission-item-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.submission-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  border: 1px solid;
}

.submission-badge-missing {
  background: var(--color-bg-secondary);
  border-color: var(--color-border-strong);
  color: var(--color-text-muted);
}

.submission-badge-pending {
  background: var(--color-warning-soft);
  border-color: var(--color-warning-border);
  color: var(--color-warning);
}

.submission-badge-graded {
  background: var(--color-success-soft);
  border-color: var(--color-success-border);
  color: var(--color-success);
}

.submission-badge-stuck {
  background: var(--color-warning-soft);
  border-color: var(--color-warning-border);
  color: var(--color-warning);
  animation: pulse-stuck 2s ease-in-out infinite;
}

@keyframes pulse-stuck {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* --------------------------------------------------------
   32. Scrollbar
   -------------------------------------------------------- */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* --------------------------------------------------------
   33. Responsive
   -------------------------------------------------------- */

@media (min-width: 640px) {
  .card {
    padding: var(--space-8);
  }

  .card-header {
    margin-bottom: var(--space-8);
  }

  .card-title {
    font-size: var(--text-3xl);
  }

  .card-narrow {
    margin-top: var(--space-10);
  }

  .error-code {
    font-size: 5rem;
  }

  .app-navbar-inner {
    padding: 0 var(--space-8);
  }

  .hero-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-8);
  }

  .hero-name {
    font-size: var(--text-3xl);
  }

  .hero-actions {
    flex-shrink: 0;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .quick-actions {
    grid-template-columns: repeat(2, 1fr);
  }

  .class-item {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .inline-form {
    flex-direction: row;
    align-items: flex-end;
  }

  .inline-form-field {
    min-width: 16rem;
  }

  .inline-form .btn {
    width: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  .import-summary {
    grid-template-columns: repeat(4, 1fr);
  }

  .password-item {
    flex-direction: row;
    align-items: center;
    gap: var(--space-4);
  }

  .password-item-npm {
    min-width: 8rem;
  }

  .password-item-name {
    flex-grow: 1;
  }

  .password-item-value {
    margin-top: 0;
  }

  .failure-item {
    flex-direction: row;
    gap: var(--space-4);
  }

  .failure-row {
    min-width: 12rem;
  }

  .card-header-with-action {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .btn-sm-inline {
    align-self: auto;
  }

  .form-row-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
  }

  .form-actions {
    flex-direction: row;
    justify-content: flex-end;
  }

  .form-actions .btn {
    width: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  .info-item {
    flex-direction: row;
    align-items: center;
    gap: var(--space-5);
  }

  .info-label {
    min-width: 10rem;
    flex-shrink: 0;
    margin-bottom: 0;
  }

  .question-item,
  .exam-question {
    padding: var(--space-6);
  }

  .timer-value {
    font-size: 4rem;
  }

  .result-score-value {
    font-size: 4rem;
  }

  .submission-item {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .submission-item-status {
    flex-shrink: 0;
  }

  .submission-item-actions {
    flex-shrink: 0;
  }
}

@media (min-width: 768px) {
  .app-main {
    padding: var(--space-8);
  }

  .app-footer {
    padding: var(--space-8) var(--space-4);
    font-size: var(--text-sm);
  }

  .card-title {
    font-size: var(--text-3xl);
  }

  .error-title {
    font-size: var(--text-3xl);
  }

  .error-code {
    font-size: 6rem;
  }

  .landing-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .landing-brand {
    font-size: var(--text-5xl);
  }

  .auth-layout {
    grid-template-columns: 1fr 1fr;
  }

  .auth-panel {
    display: flex;
    flex-direction: column;
  }

  .auth-form-panel {
    padding: var(--space-8);
  }

  .exam-sidebar-timer-value {
    font-size: 1.75rem;
  }
}

@media (min-width: 1024px) {
  .stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .auth-layout {
    grid-template-columns: 5fr 4fr;
  }

  .exam-layout {
    grid-template-columns: 1fr 16rem;
    align-items: start;
  }

  .exam-sidebar {
    order: 0;
    position: sticky;
    top: 4.5rem;
    background: transparent;
    padding: 0;
    margin-bottom: 0;
  }

  .exam-sidebar-timer {
    padding: var(--space-3) var(--space-4);
  }

  .exam-sidebar-timer-value {
    font-size: 1.75rem;
  }

  .exam-sidebar-section {
    padding: var(--space-4);
  }

  .exam-nav-scroll {
    overflow: visible;
  }

  .exam-nav-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    min-width: 0;
  }

  .exam-submit-desktop {
    display: block;
  }

  .exam-submit-mobile {
    display: none;
  }

  .exam-question {
    scroll-margin-top: 6rem;
  }
}

/* --------------------------------------------------------
   34. Math preview (KaTeX) — NEW (Batch 6)
   -------------------------------------------------------- */

/* Container preview di bawah textarea */
.math-preview {
  margin-top: var(--space-3);
  padding: var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  max-height: 400px;
  overflow-y: auto;
  font-size: var(--text-sm);
}

.math-preview-empty {
  color: var(--color-text-dim);
  font-style: italic;
  font-size: var(--text-sm);
  margin: 0;
}

.math-preview-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.math-preview-row {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary-border);
}

.math-preview-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-dim);
  flex-shrink: 0;
  min-width: 1.5rem;
  text-align: right;
  padding-top: 0.15em;
}

.math-preview-content {
  flex-grow: 1;
  min-width: 0;
  word-wrap: break-word;
  line-height: 1.7;
  font-size: var(--text-sm);
  color: var(--color-text);
}

/* KaTeX display-mode di dalam preview — beri margin */
.math-preview-content .katex-display {
  margin: var(--space-2) 0;
}

/* Error rendering (LaTeX tidak valid) */
.katex-error {
  color: var(--color-danger);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  background: var(--color-danger-soft);
  padding: 0.1em 0.4em;
  border-radius: var(--radius-sm);
}

/* KaTeX inline di dalam teks form — jaga alignment */
.question-text .katex,
.question-option-text .katex,
.info-description-body .katex,
.feedback-body .katex,
.math-preview-content .katex {
  font-size: 1.05em;
}

/* KaTeX display-mode — center dengan margin */
.question-text .katex-display,
.info-description-body .katex-display,
.feedback-body .katex-display {
  margin: var(--space-3) 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: var(--space-2) 0;
}

/* Scrollbar halus untuk overflow LaTeX panjang */
.question-text .katex-display::-webkit-scrollbar,
.info-description-body .katex-display::-webkit-scrollbar,
.feedback-body .katex-display::-webkit-scrollbar {
  height: 4px;
}

.question-text .katex-display::-webkit-scrollbar-thumb,
.info-description-body .katex-display::-webkit-scrollbar-thumb,
.feedback-body .katex-display::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 10px;
}