:root {
  --ruk-brand-main: #1E40AF;
  --ruk-brand-deep: #1E3A8A;
  --ruk-brand-bright: #3B82F6;
  --ruk-brand-muted: #DBEAFE;
  
  --ruk-positive: #16A34A;
  --ruk-positive-bright: #4ADE80;
  --ruk-positive-soft: #DCFCE7;
  
  --ruk-caution: #EAB308;
  --ruk-caution-bright: #FACC15;
  --ruk-caution-soft: #FEF9C3;
  
  --ruk-negative: #DC2626;
  --ruk-negative-bright: #EF4444;
  --ruk-negative-soft: #FEE2E2;
  
  --ruk-neutral-info: #0EA5E9;
  --ruk-neutral-info-bright: #38BDF8;
  --ruk-neutral-info-soft: #E0F2FE;
  
  --ruk-canvas: #FFFFFF;
  --ruk-surface-1: #F9FAFB;
  --ruk-surface-2: #F3F4F6;
  --ruk-surface-3: #E5E7EB;
  --ruk-border-soft: #D1D5DB;
  --ruk-text-muted: #9CA3AF;
  --ruk-text-secondary: #6B7280;
  --ruk-text-tertiary: #4B5563;
  --ruk-text-primary: #374151;
  --ruk-text-heading: #1F2937;
  --ruk-ink: #111827;
  
  --ruk-mark-excellent: #16A34A;
  --ruk-mark-good: #3B82F6;
  --ruk-mark-satisfactory: #EAB308;
  --ruk-mark-poor: #DC2626;
  --ruk-mark-skip: #6B7280;
  
  --ruk-typeface: 'Golos Text', 'Inter', 'PT Sans', -apple-system, sans-serif;
  --ruk-size-micro: 0.75rem;
  --ruk-size-small: 0.875rem;
  --ruk-size-normal: 1rem;
  --ruk-size-medium: 1.125rem;
  --ruk-size-large: 1.25rem;
  --ruk-size-xlarge: 1.5rem;
  --ruk-size-xxlarge: 1.875rem;
  --ruk-size-huge: 2.25rem;
  
  --ruk-weight-regular: 400;
  --ruk-weight-book: 500;
  --ruk-weight-demi: 600;
  --ruk-weight-heavy: 700;
  
  --ruk-gap-xs: 0.25rem;
  --ruk-gap-sm: 0.5rem;
  --ruk-gap-md: 0.75rem;
  --ruk-gap-base: 1rem;
  --ruk-gap-lg: 1.25rem;
  --ruk-gap-xl: 1.5rem;
  --ruk-gap-2xl: 2rem;
  --ruk-gap-3xl: 2.5rem;
  --ruk-gap-4xl: 3rem;
  --ruk-gap-5xl: 4rem;
  
  --ruk-curve-xs: 0.25rem;
  --ruk-curve-sm: 0.5rem;
  --ruk-curve-md: 0.75rem;
  --ruk-curve-lg: 1rem;
  --ruk-curve-xl: 1.5rem;
  --ruk-curve-pill: 9999px;
  
  --ruk-elevation-1: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --ruk-elevation-2: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --ruk-elevation-3: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --ruk-elevation-4: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --ruk-elevation-5: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  --ruk-motion-quick: 150ms ease-in-out;
  --ruk-motion-normal: 250ms ease-in-out;
  --ruk-motion-smooth: 350ms ease-in-out;
  
  --ruk-layer-popup: 1000;
  --ruk-layer-fixed: 1020;
  --ruk-layer-header: 1030;
  --ruk-layer-overlay: 1040;
  --ruk-layer-dialog: 1050;
  --ruk-layer-float: 1060;
  --ruk-layer-hint: 1070;
}

[data-appearance="inverted"] {
  --ruk-canvas: #1F2937;
  --ruk-surface-1: #111827;
  --ruk-surface-2: #1F2937;
  --ruk-surface-3: #374151;
  --ruk-border-soft: #4B5563;
  --ruk-text-muted: #6B7280;
  --ruk-text-secondary: #9CA3AF;
  --ruk-text-tertiary: #D1D5DB;
  --ruk-text-primary: #E5E7EB;
  --ruk-text-heading: #F3F4F6;
  --ruk-ink: #F9FAFB;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--ruk-typeface);
  font-size: var(--ruk-size-normal);
  font-weight: var(--ruk-weight-regular);
  line-height: 1.6;
  color: var(--ruk-text-heading);
  background-color: var(--ruk-surface-1);
}

a {
  color: var(--ruk-brand-main);
  text-decoration: none;
  transition: color var(--ruk-motion-quick);
}

a:hover {
  color: var(--ruk-brand-deep);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--ruk-weight-heavy);
  line-height: 1.2;
  color: var(--ruk-ink);
  margin-bottom: var(--ruk-gap-base);
}

h1 {
  font-size: var(--ruk-size-huge);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--ruk-size-xxlarge);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--ruk-size-xlarge);
}

h4 {
  font-size: var(--ruk-size-large);
}

h5 {
  font-size: var(--ruk-size-medium);
}

h6 {
  font-size: var(--ruk-size-normal);
}

p {
  margin-bottom: var(--ruk-gap-base);
}

.text-xs { font-size: var(--ruk-size-micro); }
.text-sm { font-size: var(--ruk-size-small); }
.text-base { font-size: var(--ruk-size-normal); }
.text-lg { font-size: var(--ruk-size-medium); }
.text-xl { font-size: var(--ruk-size-large); }
.text-2xl { font-size: var(--ruk-size-xlarge); }
.text-3xl { font-size: var(--ruk-size-xxlarge); }

.font-normal { font-weight: var(--ruk-weight-regular); }
.font-medium { font-weight: var(--ruk-weight-book); }
.font-semibold { font-weight: var(--ruk-weight-demi); }
.font-bold { font-weight: var(--ruk-weight-heavy); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--ruk-gap-xl);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--ruk-gap-xl);
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: var(--ruk-gap-2xl) 0;
}

.grid {
  display: grid;
  gap: var(--ruk-gap-xl);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-cols-5 { grid-template-columns: repeat(5, 1fr); }
.grid-cols-6 { grid-template-columns: repeat(6, 1fr); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--ruk-gap-xs); }
.gap-2 { gap: var(--ruk-gap-sm); }
.gap-3 { gap: var(--ruk-gap-md); }
.gap-4 { gap: var(--ruk-gap-base); }
.gap-6 { gap: var(--ruk-gap-xl); }
.gap-8 { gap: var(--ruk-gap-2xl); }

.header {
  background: linear-gradient(135deg, var(--ruk-brand-main) 0%, var(--ruk-brand-deep) 100%);
  color: var(--ruk-canvas);
  box-shadow: var(--ruk-elevation-2);
  position: sticky;
  top: 0;
  z-index: var(--ruk-layer-fixed);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--ruk-gap-sm) var(--ruk-gap-xl);
  max-width: 1440px;
  margin: 0 auto;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--ruk-gap-sm);
  font-size: var(--ruk-size-normal);
  font-weight: var(--ruk-weight-heavy);
  color: var(--ruk-canvas);
}

.navbar-brand:hover {
  color: var(--ruk-canvas);
  text-decoration: none;
  opacity: 0.9;
}

.navbar-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--ruk-curve-sm);
  background: var(--ruk-canvas);
  padding: var(--ruk-gap-sm);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--ruk-gap-xl);
  list-style: none;
}

.navbar-link {
  color: var(--ruk-canvas);
  font-weight: var(--ruk-weight-book);
  font-size: var(--ruk-size-small);
  padding: var(--ruk-gap-xs) var(--ruk-gap-md);
  border-radius: var(--ruk-curve-sm);
  transition: all var(--ruk-motion-quick);
}

.navbar-link:hover {
  background: rgba(255, 255, 255, 0.1);
  text-decoration: none;
}

.navbar-link.active {
  background: rgba(255, 255, 255, 0.2);
}

.navbar-user {
  display: flex;
  align-items: center;
  gap: var(--ruk-gap-sm);
  padding: var(--ruk-gap-xs) var(--ruk-gap-md);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--ruk-curve-pill);
  cursor: pointer;
  transition: all var(--ruk-motion-quick);
  position: relative;
  font-size: var(--ruk-size-small);
}

.navbar-user:hover {
  background: rgba(255, 255, 255, 0.2);
}

.navbar-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--ruk-curve-pill);
  border: 2px solid var(--ruk-canvas);
  object-fit: cover;
}

.sidebar {
  width: 260px;
  background: var(--ruk-canvas);
  border-right: 1px solid var(--ruk-surface-3);
  padding: var(--ruk-gap-base);
  position: sticky;
  top: 52px;
  height: calc(100vh - 52px);
  overflow-y: auto;
}

.sidebar-nav {
  list-style: none;
}

.sidebar-item {
  margin-bottom: var(--ruk-gap-sm);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--ruk-gap-md);
  padding: var(--ruk-gap-md) var(--ruk-gap-base);
  border-radius: var(--ruk-curve-md);
  color: var(--ruk-text-primary);
  font-weight: var(--ruk-weight-book);
  transition: all var(--ruk-motion-quick);
}

.sidebar-link:hover {
  background: var(--ruk-surface-2);
  color: var(--ruk-brand-main);
  text-decoration: none;
  transform: translateX(4px);
}

.sidebar-link.active {
  background: var(--ruk-brand-muted);
  color: var(--ruk-brand-main);
  font-weight: var(--ruk-weight-demi);
}

.sidebar-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-section {
  margin-top: var(--ruk-gap-2xl);
}

.sidebar-section-title {
  font-size: var(--ruk-size-micro);
  font-weight: var(--ruk-weight-heavy);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ruk-text-secondary);
  margin-bottom: var(--ruk-gap-md);
  padding: 0 var(--ruk-gap-base);
}

.card {
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-lg);
  box-shadow: var(--ruk-elevation-1);
  border: 1px solid var(--ruk-surface-3);
  overflow: hidden;
  transition: all var(--ruk-motion-normal);
}

.card:hover {
  box-shadow: var(--ruk-elevation-2);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--ruk-gap-lg) var(--ruk-gap-xl);
  border-bottom: 1px solid var(--ruk-surface-3);
  background: var(--ruk-surface-1);
}

.card-title {
  font-size: var(--ruk-size-medium);
  font-weight: var(--ruk-weight-demi);
  color: var(--ruk-ink);
  margin: 0;
}

.card-subtitle {
  font-size: var(--ruk-size-small);
  color: var(--ruk-text-tertiary);
  margin-top: var(--ruk-gap-xs);
}

.card-body {
  padding: var(--ruk-gap-xl);
}

.card-footer {
  padding: var(--ruk-gap-base) var(--ruk-gap-xl);
  border-top: 1px solid var(--ruk-surface-3);
  background: var(--ruk-surface-1);
}

.stat-card {
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-lg);
  padding: var(--ruk-gap-xl);
  border: 2px solid var(--ruk-surface-3);
  transition: all var(--ruk-motion-normal);
}

.stat-card:hover {
  border-color: var(--ruk-brand-main);
  box-shadow: var(--ruk-elevation-3);
  transform: translateY(-4px);
}

.stat-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--ruk-gap-base);
}

.stat-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--ruk-curve-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--ruk-size-xlarge);
}

.stat-card-icon.primary { background: var(--ruk-brand-muted); color: var(--ruk-brand-main); }
.stat-card-icon.success { background: var(--ruk-positive-soft); color: var(--ruk-positive); }
.stat-card-icon.warning { background: var(--ruk-caution-soft); color: var(--ruk-caution); }
.stat-card-icon.danger { background: var(--ruk-negative-soft); color: var(--ruk-negative); }

.stat-card-value {
  font-size: var(--ruk-size-xxlarge);
  font-weight: var(--ruk-weight-heavy);
  color: var(--ruk-ink);
  line-height: 1;
}

.stat-card-label {
  font-size: var(--ruk-size-small);
  color: var(--ruk-text-tertiary);
  margin-top: var(--ruk-gap-sm);
}

.stat-card-trend {
  display: flex;
  align-items: center;
  gap: var(--ruk-gap-sm);
  margin-top: var(--ruk-gap-md);
  font-size: var(--ruk-size-small);
  font-weight: var(--ruk-weight-book);
}

.stat-card-trend.up { color: var(--ruk-positive); }
.stat-card-trend.down { color: var(--ruk-negative); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ruk-gap-sm);
  padding: var(--ruk-gap-md) var(--ruk-gap-xl);
  font-size: var(--ruk-size-normal);
  font-weight: var(--ruk-weight-book);
  border-radius: var(--ruk-curve-md);
  border: none;
  cursor: pointer;
  transition: all var(--ruk-motion-quick);
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--ruk-elevation-2);
  text-decoration: none;
}

.btn:active {
  transform: translateY(0);
}

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

.btn-primary {
  background: var(--ruk-brand-main);
  color: var(--ruk-canvas);
}

.btn-primary:hover {
  background: var(--ruk-brand-deep);
  color: var(--ruk-canvas);
}

.btn-success {
  background: var(--ruk-positive);
  color: var(--ruk-canvas);
}

.btn-success:hover {
  background: #15803D;
  color: var(--ruk-canvas);
}

.btn-warning {
  background: var(--ruk-caution);
  color: var(--ruk-ink);
}

.btn-warning:hover {
  background: #CA8A04;
}

.btn-danger {
  background: var(--ruk-negative);
  color: var(--ruk-canvas);
}

.btn-danger:hover {
  background: #B91C1C;
  color: var(--ruk-canvas);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--ruk-brand-main);
  color: var(--ruk-brand-main);
}

.btn-outline:hover {
  background: var(--ruk-brand-main);
  color: var(--ruk-canvas);
}

.btn-ghost {
  background: transparent;
  color: var(--ruk-text-primary);
}

.btn-ghost:hover {
  background: var(--ruk-surface-2);
}

.btn-sm {
  padding: var(--ruk-gap-sm) var(--ruk-gap-base);
  font-size: var(--ruk-size-small);
}

.btn-lg {
  padding: var(--ruk-gap-base) var(--ruk-gap-2xl);
  font-size: var(--ruk-size-medium);
}

.btn-icon {
  padding: var(--ruk-gap-md);
  border-radius: var(--ruk-curve-md);
}

.form-group {
  margin-bottom: var(--ruk-gap-lg);
}

.form-label {
  display: block;
  font-size: var(--ruk-size-small);
  font-weight: var(--ruk-weight-book);
  color: var(--ruk-text-primary);
  margin-bottom: var(--ruk-gap-sm);
}

.form-label-required::after {
  content: '*';
  color: var(--ruk-negative);
  margin-left: var(--ruk-gap-xs);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--ruk-gap-md) var(--ruk-gap-base);
  font-size: var(--ruk-size-normal);
  font-family: inherit;
  border: 2px solid var(--ruk-border-soft);
  border-radius: var(--ruk-curve-md);
  background: var(--ruk-canvas);
  color: var(--ruk-ink);
  transition: all var(--ruk-motion-quick);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--ruk-brand-main);
  box-shadow: 0 0 0 3px var(--ruk-brand-muted);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background: var(--ruk-surface-2);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--ruk-negative);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
  box-shadow: 0 0 0 3px var(--ruk-negative-soft);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-help {
  display: block;
  font-size: var(--ruk-size-small);
  color: var(--ruk-text-tertiary);
  margin-top: var(--ruk-gap-sm);
}

.form-error {
  display: block;
  font-size: var(--ruk-size-small);
  color: var(--ruk-negative);
  margin-top: var(--ruk-gap-sm);
}

.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  gap: var(--ruk-gap-md);
  cursor: pointer;
}

.form-checkbox input,
.form-radio input {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--ruk-brand-main);
}

.file-upload {
  border: 2px dashed var(--ruk-border-soft);
  border-radius: var(--ruk-curve-md);
  padding: var(--ruk-gap-2xl);
  text-align: center;
  background: var(--ruk-surface-1);
  transition: all var(--ruk-motion-quick);
  cursor: pointer;
}

.file-upload:hover {
  border-color: var(--ruk-brand-main);
  background: var(--ruk-brand-muted);
}

.file-upload-icon {
  font-size: var(--ruk-size-huge);
  color: var(--ruk-text-muted);
  margin-bottom: var(--ruk-gap-base);
}

.file-upload-text {
  font-size: var(--ruk-size-normal);
  color: var(--ruk-text-primary);
}

.file-upload-hint {
  font-size: var(--ruk-size-small);
  color: var(--ruk-text-secondary);
  margin-top: var(--ruk-gap-sm);
}

.table-wrapper {
  overflow-x: auto;
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-lg);
  box-shadow: var(--ruk-elevation-1);
  border: 1px solid var(--ruk-surface-3);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--ruk-size-small);
}

.table thead {
  background: linear-gradient(to bottom, var(--ruk-surface-2), var(--ruk-surface-1));
  border-bottom: 2px solid var(--ruk-border-soft);
}

.table th {
  padding: var(--ruk-gap-base) var(--ruk-gap-lg);
  text-align: left;
  font-weight: var(--ruk-weight-demi);
  color: var(--ruk-ink);
  white-space: nowrap;
  position: sticky;
  top: 0;
  background: var(--ruk-surface-2);
  z-index: 10;
}

.table td {
  padding: var(--ruk-gap-base) var(--ruk-gap-lg);
  border-bottom: 1px solid var(--ruk-surface-3);
  color: var(--ruk-text-primary);
}

.table tbody tr {
  transition: background var(--ruk-motion-quick);
}

.table tbody tr:hover {
  background: var(--ruk-surface-1);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table th:first-child,
.table td:first-child {
  position: sticky;
  left: 0;
  background: var(--ruk-canvas);
  z-index: 11;
}

.table thead th:first-child {
  background: var(--ruk-surface-2);
  z-index: 12;
}

.table tbody tr:hover td:first-child {
  background: var(--ruk-surface-1);
}

.journal-table {
  font-size: var(--ruk-size-small);
}

.journal-table th {
  font-size: var(--ruk-size-micro);
  text-align: center;
  padding: var(--ruk-gap-md);
}

.journal-table td {
  text-align: center;
  padding: var(--ruk-gap-md);
  min-width: 60px;
}

.journal-table .student-name {
  text-align: left;
  font-weight: var(--ruk-weight-book);
  min-width: 200px;
  max-width: 250px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.grade-cell {
  cursor: pointer;
  position: relative;
  font-weight: var(--ruk-weight-demi);
  border-radius: var(--ruk-curve-sm);
  transition: all var(--ruk-motion-quick);
}

.grade-cell:hover {
  transform: scale(1.1);
  box-shadow: var(--ruk-elevation-2);
  z-index: 1;
}

.grade-cell.empty {
  color: var(--ruk-text-muted);
}

.grade-cell.grade-5 {
  color: var(--ruk-mark-excellent);
  background: var(--ruk-positive-soft);
}

.grade-cell.grade-4 {
  color: var(--ruk-mark-good);
  background: var(--ruk-neutral-info-soft);
}

.grade-cell.grade-3 {
  color: var(--ruk-mark-satisfactory);
  background: var(--ruk-caution-soft);
}

.grade-cell.grade-2 {
  color: var(--ruk-mark-poor);
  background: var(--ruk-negative-soft);
}

.grade-cell.absent {
  color: var(--ruk-mark-skip);
  background: var(--ruk-surface-2);
}

.average-grade {
  font-weight: var(--ruk-weight-heavy);
  color: var(--ruk-brand-main);
  background: var(--ruk-brand-muted);
  border-radius: var(--ruk-curve-sm);
  padding: var(--ruk-gap-sm);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--ruk-gap-sm);
  padding: var(--ruk-gap-xs) var(--ruk-gap-md);
  font-size: var(--ruk-size-micro);
  font-weight: var(--ruk-weight-book);
  border-radius: var(--ruk-curve-pill);
  white-space: nowrap;
}

.badge-primary {
  background: var(--ruk-brand-muted);
  color: var(--ruk-brand-main);
}

.badge-success {
  background: var(--ruk-positive-soft);
  color: var(--ruk-positive);
}

.badge-warning {
  background: var(--ruk-caution-soft);
  color: var(--ruk-caution);
}

.badge-danger {
  background: var(--ruk-negative-soft);
  color: var(--ruk-negative);
}

.badge-info {
  background: var(--ruk-neutral-info-soft);
  color: var(--ruk-neutral-info);
}

.badge-gray {
  background: var(--ruk-surface-3);
  color: var(--ruk-text-primary);
}

.alert {
  padding: var(--ruk-gap-base) var(--ruk-gap-lg);
  border-radius: var(--ruk-curve-md);
  border-left: 4px solid;
  margin-bottom: var(--ruk-gap-base);
  display: flex;
  align-items: flex-start;
  gap: var(--ruk-gap-md);
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--ruk-weight-demi);
  margin-bottom: var(--ruk-gap-sm);
}

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

.alert-warning {
  background: var(--ruk-caution-soft);
  border-color: var(--ruk-caution);
  color: #92400E;
}

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

.alert-info {
  background: var(--ruk-neutral-info-soft);
  border-color: var(--ruk-neutral-info);
  color: var(--ruk-neutral-info);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--ruk-layer-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--ruk-gap-base);
  animation: rukFadeIn var(--ruk-motion-normal);
}

@keyframes rukFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-xl);
  box-shadow: var(--ruk-elevation-5);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: rukSlideUp var(--ruk-motion-normal);
}

@keyframes rukSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-header {
  padding: var(--ruk-gap-xl);
  border-bottom: 1px solid var(--ruk-surface-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--ruk-size-large);
  font-weight: var(--ruk-weight-demi);
  color: var(--ruk-ink);
  margin: 0;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--ruk-curve-sm);
  border: none;
  background: var(--ruk-surface-2);
  color: var(--ruk-text-tertiary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--ruk-motion-quick);
}

.modal-close:hover {
  background: var(--ruk-surface-3);
  color: var(--ruk-ink);
}

.modal-body {
  padding: var(--ruk-gap-xl);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: var(--ruk-gap-lg) var(--ruk-gap-xl);
  border-top: 1px solid var(--ruk-surface-3);
  display: flex;
  gap: var(--ruk-gap-md);
  justify-content: flex-end;
  background: var(--ruk-surface-1);
}

.schedule-card {
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-md);
  padding: var(--ruk-gap-lg);
  border-left: 4px solid;
  box-shadow: var(--ruk-elevation-1);
  transition: all var(--ruk-motion-quick);
  margin-bottom: var(--ruk-gap-base);
}

.schedule-card:hover {
  box-shadow: var(--ruk-elevation-2);
  transform: translateX(4px);
}

.schedule-card.lecture {
  border-color: var(--ruk-brand-main);
}

.schedule-card.practice {
  border-color: var(--ruk-positive);
}

.schedule-card.lab {
  border-color: var(--ruk-caution);
}

.schedule-card.exam {
  border-color: var(--ruk-negative);
}

.schedule-card.current {
  background: linear-gradient(to right, var(--ruk-brand-muted), var(--ruk-canvas));
  box-shadow: var(--ruk-elevation-3);
}

.schedule-time {
  font-size: var(--ruk-size-medium);
  font-weight: var(--ruk-weight-heavy);
  color: var(--ruk-ink);
  margin-bottom: var(--ruk-gap-sm);
}

.schedule-subject {
  font-size: var(--ruk-size-normal);
  font-weight: var(--ruk-weight-demi);
  color: var(--ruk-text-heading);
  margin-bottom: var(--ruk-gap-sm);
}

.schedule-details {
  display: flex;
  gap: var(--ruk-gap-base);
  font-size: var(--ruk-size-small);
  color: var(--ruk-text-tertiary);
}

.schedule-detail {
  display: flex;
  align-items: center;
  gap: var(--ruk-gap-sm);
}

.widget {
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-lg);
  padding: var(--ruk-gap-xl);
  box-shadow: var(--ruk-elevation-1);
  border: 1px solid var(--ruk-surface-3);
}

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

.widget-title {
  font-size: var(--ruk-size-medium);
  font-weight: var(--ruk-weight-demi);
  color: var(--ruk-ink);
  margin: 0;
}

.widget-action {
  font-size: var(--ruk-size-small);
  color: var(--ruk-brand-main);
  cursor: pointer;
  transition: color var(--ruk-motion-quick);
}

.widget-action:hover {
  color: var(--ruk-brand-deep);
  text-decoration: underline;
}

.progress {
  width: 100%;
  height: 8px;
  background: var(--ruk-surface-3);
  border-radius: var(--ruk-curve-pill);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(to right, var(--ruk-brand-main), var(--ruk-brand-bright));
  border-radius: var(--ruk-curve-pill);
  transition: width var(--ruk-motion-smooth);
}

.progress-bar.success {
  background: linear-gradient(to right, var(--ruk-positive), var(--ruk-positive-bright));
}

.progress-bar.warning {
  background: linear-gradient(to right, var(--ruk-caution), var(--ruk-caution-bright));
}

.progress-bar.danger {
  background: linear-gradient(to right, var(--ruk-negative), var(--ruk-negative-bright));
}

.tabs {
  border-bottom: 2px solid var(--ruk-surface-3);
  margin-bottom: var(--ruk-gap-xl);
}

.tabs-list {
  display: flex;
  gap: var(--ruk-gap-sm);
  list-style: none;
}

.tab-item {
  padding: var(--ruk-gap-md) var(--ruk-gap-lg);
  font-weight: var(--ruk-weight-book);
  color: var(--ruk-text-tertiary);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: all var(--ruk-motion-quick);
}

.tab-item:hover {
  color: var(--ruk-brand-main);
}

.tab-item.active {
  color: var(--ruk-brand-main);
  border-bottom-color: var(--ruk-brand-main);
  font-weight: var(--ruk-weight-demi);
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--ruk-gap-sm);
  margin-top: var(--ruk-gap-xl);
}

.pagination-item {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--ruk-curve-sm);
  font-weight: var(--ruk-weight-book);
  color: var(--ruk-text-primary);
  cursor: pointer;
  transition: all var(--ruk-motion-quick);
  border: 1px solid var(--ruk-border-soft);
}

.pagination-item:hover {
  background: var(--ruk-surface-2);
  border-color: var(--ruk-text-muted);
}

.pagination-item.active {
  background: var(--ruk-brand-main);
  color: var(--ruk-canvas);
  border-color: var(--ruk-brand-main);
}

.pagination-item:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--ruk-gap-sm);
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-md);
  box-shadow: var(--ruk-elevation-4);
  border: 1px solid var(--ruk-surface-3);
  min-width: 200px;
  z-index: var(--ruk-layer-popup);
  overflow: hidden;
  animation: rukDropIn var(--ruk-motion-quick);
}

@keyframes rukDropIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--ruk-gap-md);
  padding: var(--ruk-gap-md) var(--ruk-gap-base);
  color: var(--ruk-text-primary);
  cursor: pointer;
  transition: background var(--ruk-motion-quick);
  text-decoration: none;
}

.dropdown-item:hover {
  background: var(--ruk-surface-2);
  text-decoration: none;
}

.dropdown-divider {
  height: 1px;
  background: var(--ruk-surface-3);
  margin: var(--ruk-gap-sm) 0;
}

.toast-container {
  position: fixed;
  top: var(--ruk-gap-xl);
  right: var(--ruk-gap-xl);
  z-index: var(--ruk-layer-hint);
  display: flex;
  flex-direction: column;
  gap: var(--ruk-gap-md);
}

.toast {
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-md);
  box-shadow: var(--ruk-elevation-4);
  padding: var(--ruk-gap-base) var(--ruk-gap-lg);
  min-width: 320px;
  display: flex;
  align-items: flex-start;
  gap: var(--ruk-gap-md);
  border-left: 4px solid;
  animation: rukSlideInRight var(--ruk-motion-normal);
}

@keyframes rukSlideInRight {
  from { opacity: 0; transform: translateX(100px); }
  to { opacity: 1; transform: translateX(0); }
}

.toast-success { border-color: var(--ruk-positive); }
.toast-warning { border-color: var(--ruk-caution); }
.toast-danger { border-color: var(--ruk-negative); }
.toast-info { border-color: var(--ruk-neutral-info); }

.toast-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: var(--ruk-weight-demi);
  color: var(--ruk-ink);
  margin-bottom: var(--ruk-gap-xs);
}

.toast-message {
  font-size: var(--ruk-size-small);
  color: var(--ruk-text-tertiary);
}

.avatar {
  border-radius: var(--ruk-curve-pill);
  object-fit: cover;
  background: var(--ruk-surface-3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--ruk-weight-demi);
  color: var(--ruk-canvas);
}

.avatar-sm { width: 32px; height: 32px; font-size: var(--ruk-size-small); }
.avatar-md { width: 48px; height: 48px; font-size: var(--ruk-size-medium); }
.avatar-lg { width: 80px; height: 80px; font-size: var(--ruk-size-xlarge); }
.avatar-xl { width: 120px; height: 120px; font-size: var(--ruk-size-xxlarge); }

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--ruk-surface-3);
  border-top-color: var(--ruk-brand-main);
  border-radius: var(--ruk-curve-pill);
  animation: rukRotate 1s linear infinite;
}

@keyframes rukRotate {
  to { transform: rotate(360deg); }
}

.spinner-sm { width: 20px; height: 20px; border-width: 2px; }
.spinner-lg { width: 60px; height: 60px; border-width: 6px; }

.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.empty-state {
  text-align: center;
  padding: var(--ruk-gap-4xl) var(--ruk-gap-xl);
}

.empty-state-icon {
  font-size: var(--ruk-size-huge);
  color: var(--ruk-text-muted);
  margin-bottom: var(--ruk-gap-base);
}

.empty-state-title {
  font-size: var(--ruk-size-large);
  font-weight: var(--ruk-weight-demi);
  color: var(--ruk-ink);
  margin-bottom: var(--ruk-gap-md);
}

.empty-state-text {
  font-size: var(--ruk-size-normal);
  color: var(--ruk-text-tertiary);
  margin-bottom: var(--ruk-gap-xl);
}

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--ruk-brand-main) 0%, var(--ruk-brand-deep) 100%);
  padding: var(--ruk-gap-xl);
}

.login-card {
  background: var(--ruk-canvas);
  border-radius: var(--ruk-curve-xl);
  box-shadow: var(--ruk-elevation-5);
  padding: var(--ruk-gap-3xl);
  max-width: 450px;
  width: 100%;
}

.login-logo {
  text-align: center;
  margin-bottom: var(--ruk-gap-2xl);
}

.login-logo img {
  width: 120px;
  height: auto;
  margin: 0 auto var(--ruk-gap-base);
}

.login-title {
  font-size: var(--ruk-size-xlarge);
  font-weight: var(--ruk-weight-heavy);
  color: var(--ruk-ink);
  text-align: center;
  margin-bottom: var(--ruk-gap-sm);
}

.login-subtitle {
  font-size: var(--ruk-size-normal);
  color: var(--ruk-text-tertiary);
  text-align: center;
  margin-bottom: var(--ruk-gap-2xl);
}

.w-full { width: 100%; }
.h-full { height: 100%; }
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.m-0 { margin: 0; }
.mt-auto { margin-top: auto; }
.mt-4 { margin-top: var(--ruk-gap-base); }
.mb-4 { margin-bottom: var(--ruk-gap-base); }
.mb-6 { margin-bottom: var(--ruk-gap-xl); }
.mb-8 { margin-bottom: var(--ruk-gap-2xl); }
.ml-2 { margin-left: var(--ruk-gap-sm); }

.p-0 { padding: 0; }
.p-4 { padding: var(--ruk-gap-base); }
.p-6 { padding: var(--ruk-gap-xl); }

.text-primary { color: var(--ruk-brand-main); }
.text-success { color: var(--ruk-positive); }
.text-warning { color: var(--ruk-caution); }
.text-danger { color: var(--ruk-negative); }
.text-gray-600 { color: var(--ruk-text-tertiary); }
.text-gray-900 { color: var(--ruk-ink); }

.bg-primary { background-color: var(--ruk-brand-main); }
.bg-white { background-color: var(--ruk-canvas); }
.bg-gray-50 { background-color: var(--ruk-surface-1); }
.bg-gray-100 { background-color: var(--ruk-surface-2); }

.rounded { border-radius: var(--ruk-curve-sm); }
.rounded-lg { border-radius: var(--ruk-curve-md); }
.rounded-xl { border-radius: var(--ruk-curve-lg); }
.rounded-full { border-radius: var(--ruk-curve-pill); }

.shadow-sm { box-shadow: var(--ruk-elevation-1); }
.shadow-md { box-shadow: var(--ruk-elevation-2); }
.shadow-lg { box-shadow: var(--ruk-elevation-3); }

@media (max-width: 1024px) {
  .sidebar { width: 240px; }
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  html { font-size: 14px; }
  .navbar { flex-direction: column; gap: var(--ruk-gap-base); }
  .navbar-menu { flex-direction: column; width: 100%; }
  .sidebar { display: none; }
  .grid-cols-3, .grid-cols-2 { grid-template-columns: 1fr; }
  .table-wrapper { overflow-x: scroll; }
  .modal { max-width: 100%; margin: var(--ruk-gap-base); }
  .stat-card { text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--ruk-gap-base); }
  .login-card { padding: var(--ruk-gap-xl); }
  .card-body { padding: var(--ruk-gap-base); }
}

@media print {
  .navbar, .sidebar, .btn, .dropdown, .modal-backdrop { display: none !important; }
  .card { box-shadow: none; border: 1px solid var(--ruk-border-soft); }
  .page-break { page-break-before: always; }
}

@keyframes rukPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.animate-pulse {
  animation: rukPulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes rukBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.animate-bounce {
  animation: rukBounce 1s infinite;
}

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

::-webkit-scrollbar-track {
  background: var(--ruk-surface-2);
  border-radius: var(--ruk-curve-pill);
}

::-webkit-scrollbar-thumb {
  background: var(--ruk-text-muted);
  border-radius: var(--ruk-curve-pill);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--ruk-text-secondary);
}

::selection {
  background: var(--ruk-brand-muted);
  color: var(--ruk-brand-deep);
}

:focus-visible {
  outline: 2px solid var(--ruk-brand-main);
  outline-offset: 2px;
}

.text-breakable {
  word-wrap: break-word;
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
}

.prose {
  word-wrap: break-word;
  overflow-wrap: break-word;
  word-break: break-word;
}

.prose p,
.prose div,
.prose span {
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.content-container {
  max-width: 100%;
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
}

.whitespace-pre-wrap {
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
  word-break: break-word;
}

.student-answer {
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
  word-break: break-word;
  max-width: 100%;
}