/* =============================================================================
   Harry Llama Scheduler - Design System
   Professional Educational Management Interface
   ============================================================================= */

/* Import Inter Font from Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* =============================================================================
   CSS Custom Properties (Design Tokens)
   ============================================================================= */

:root {
  /* Final Brand Colors (from Logo v3) */
  --color-primary: #4A3F7A;            /* Purple */
  --color-primary-dark: #3C3261;
  --color-accent: #F2854A;              /* Orange */
  --color-text-on-dark: #F5F5DC;      /* Cream */
  --color-text-dark: #3D4852;          /* Charcoal */

 /* Functional UI Colors */
  --color-success: #2ECC71;
  --color-success-light: #D5EDDA;
  --color-error: #E74C3C;
  --color-error-light: #F8D7DA;
  --color-warning: #F39C12;
  --color-warning-light: #FFF3CD;
  --color-info: #3498DB;
  --color-info-light: #D1ECF1;
  --color-action-blue: #007bff; /* Blue for actions like buttons and links */

  /* Schedule Grid Colors */
  --color-covered-external: #2ECC71;     /* Green - External substitute */
  --color-covered-external-light: #D5EDDA;
  --color-covered-coteacher: #3498DB;    /* Blue - Co-teacher covering */
  --color-covered-coteacher-light: #D1ECF1;
  --color-uncovered: #E74C3C;            /* Red - Uncovered period */
  --color-uncovered-light: #F8D7DA;
  --color-covered-internal: #9B59B6;     /* Purple - Internal teacher coverage */
  --color-covered-internal-light: #E8DAEF;

  /* Neutral Greys */
  --color-background: #d4dada;
  --color-surface: #e5e3e3;
  --color-border: #919292;
  --color-text-body: #7a7d7f;
  --color-text-muted: #6C757D;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

/* Spacing, Radius, Shadows */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* =============================================================================
   Base Styles
   ============================================================================= */

* { box-sizing: border-box; }
body {
  font-family: var(--font-family), system-ui, sans-serif;
}
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-dark);
  margin: 0 0 var(--spacing-md) 0;
}
p { margin: 0 0 var(--spacing-md) 0; }

/* =============================================================================
   Typography
   ============================================================================= */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-dark);
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

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

.text-light {
  font-weight: var(--font-weight-light);
}

.text-medium {
  font-weight: var(--font-weight-medium);
}

font-weight:

var
(
--font-weight-medium

)
;
}

/* =============================================================================
   Button & Form System
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}
.btn-primary { background-color: var(--color-primary); color: var(--color-surface); }
.btn-primary:hover { background-color: var(--color-primary-dark); }
.btn-success { background-color: var(--color-success); color: var(--color-surface); }
.form-control {
    display: block; width: 100%; padding: 0.75rem;
    border: 1px solid var(--color-border); border-radius: var(--radius-md);
}
.form-control:focus { border-color: var(--color-primary); outline: 0; box-shadow: 0 0 0 3px rgba(74, 63, 122, 0.1); }


/* =============================================================================
   Layout & Cards
   ============================================================================= */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}
.card-header { padding: var(--spacing-md) var(--spacing-lg); border-bottom: 1px solid var(--color-border); }
.card-body { padding: var(--spacing-lg); }
.card-title { font-size: 1.25rem; }

/* =============================================================================
   Schedule Grid Components
   ============================================================================= */

.schedule-grid {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.schedule-grid th,
.schedule-grid td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

.schedule-grid th {
  background-color: var(--color-primary);
  color: var(--color-text-on-dark);
  font-weight: var(--font-weight-semibold);
  text-align: center;
}

.schedule-grid tr:last-child td {
  border-bottom: none;
}

/* Period Cell States */
.period-cell {
  min-width: 120px;
  text-align: center;
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  transition: all 0.2s ease-in-out;
}

/* Green - External substitute covering */
.period-cell.covered-external {
  background-color: var(--color-covered-external-light);
  color: var(--color-covered-external);
  border: 1px solid var(--color-covered-external);
}

/* Blue - Co-teacher covering */
.period-cell.covered-coteacher {
  background-color: var(--color-covered-coteacher-light);
  color: var(--color-covered-coteacher);
  border: 1px solid var(--color-covered-coteacher);
}

/* Red - Uncovered period */
.period-cell.uncovered {
  background-color: var(--color-uncovered-light);
  color: var(--color-uncovered);
  border: 1px solid var(--color-uncovered);
}

/* Purple - Internal teacher covering */
.period-cell.covered-internal {
  background-color: var(--color-covered-internal-light);
  color: var(--color-covered-internal);
  border: 1px solid var(--color-covered-internal);
}

/* Default/Scheduled state */
.period-cell.scheduled {
  background-color: var(--color-background);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

/* =============================================================================
   Teacher Profile Cards
   ============================================================================= */

.teacher-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: box-shadow 0.2s ease-in-out;
}

.teacher-card:hover {
  box-shadow: var(--shadow-md);
}

.teacher-name {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-xs);
}

.teacher-info {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.availability-indicator {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
}

.availability-indicator.available {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.availability-indicator.unavailable {
  background-color: var(--color-error-light);
  color: var(--color-error);
}

.availability-indicator.partial {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

/* =============================================================================
   Navigation Components
   ============================================================================= */

.nav-header {
  background-color: var(--color-primary);
  color: var(--color-text-on-dark);
  padding: var(--spacing-sm) var(--spacing-lg);
  box-shadow: var(--shadow-md);
  min-height: 90px;
  display: flex;
  align-items: center;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  height: 100%;
}

.nav-logo {
  height: 80px;
  width: auto;
  transition: transform 0.2s ease-in-out;
}

.nav-logo-text {
  height: 60px;
  width: auto;
  transition: transform 0.2s ease-in-out;
}

.logo-link:hover .nav-logo,
.logo-link:hover .nav-logo-text {
  transform: scale(1.05);
}

.nav-title { color: var(--color-surface); }
.nav-subtitle { color: var(--color-text-on-dark); opacity: 0.8; }
.nav-menu { display: flex; list-style: none; margin: 0; padding: 0; gap: var(--spacing-md); }
.nav-link {
  color: var(--color-text-on-dark);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  transition: background-color 0.2s ease-in-out;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-link:hover { background-color: rgba(255, 255, 255, 0.1); }
.nav-link.active { background-color: var(--color-primary-dark); }
.nav-link svg { width: 1.25rem; height: 1.25rem; }

/* Logout button styled as nav-link */
.logout-form { display: inline; margin: 0; padding: 0; }
.logout-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
}
.nav-item-logout { margin-left: var(--spacing-md); padding-left: var(--spacing-md); border-left: 1px solid rgba(255, 255, 255, 0.2); }

/* =============================================================================
   Other Components (Flash, Badge)
   ============================================================================= */
.flash-message { padding: 1rem; margin-bottom: 1rem; border-radius: var(--radius-md); font-weight: var(--font-weight-medium); display: flex; align-items: center; gap: var(--spacing-sm); }
.flash-success { color: #155724; background-color: var(--color-success-light); }
.flash-error { color: #721c24; background-color: var(--color-error-light); }
.flash-icon { width: 1rem; height: 1rem; flex-shrink: 0; }
.badge { padding: 0.25em 0.6em; font-size: 0.75rem; font-weight: var(--font-weight-bold); border-radius: var(--radius-md); }
.badge-primary { background-color: var(--color-primary); color: var(--color-surface); }

/* Utility classes */
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-sm { gap: 0.5rem; }
.mb-0 { margin-bottom: 0; }
.text-muted { color: var(--color-text-muted); }

/* =============================================================================
   Loading States
   ============================================================================= */

.spinner {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  border-top-color: var(--color-info);
  animation: spin 1s ease-in-out infinite;
}

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

.skeleton {
  background: linear-gradient(90deg, var(--color-border) 25%, var(--color-background) 50%, var(--color-border) 75%);
  background-size: 200% 100%;
  animation: skeleton 1.5s infinite;
}

@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* =============================================================================
   Responsive Design
   ============================================================================= */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

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

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .schedule-grid {
    font-size: 0.75rem;
  }
  
  .period-cell {
    min-width: 80px;
    padding: var(--spacing-xs);
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
}

/* =============================================================================
   Utility Classes
   ============================================================================= */

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

.d-flex { display: flex; }
.d-grid { display: grid; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-none { display: none; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.align-center { align-items: center; }
.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
/* Brand Color Utilities */
.text-brand-secondary { color: var(--color-accent); }
.bg-brand-accent-light { background-color: rgba(239, 138, 48, 0.05); }

/* Font Weight Utilities */
.fw-600 { font-weight: 600; }

/* Card Selection State */
.card-selected {
  border-color: var(--color-primary) !important;
  background-color: rgba(239, 138, 48, 0.05) !important;
}

/* Progress Bar Height Utility */
.progress-xs { height: 4px; }
.progress-thin { height: 5px; }

/* =============================================================================
   File Upload Zone Components
   ============================================================================= */

.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background-color: var(--color-background);
}

.upload-zone:hover {
  border-color: var(--color-accent);
  background-color: var(--color-surface);
}

.upload-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
}

.upload-text {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.upload-hint {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-sm);
}

/* AI Status Panel Styles */
.ai-status-panel {
  background: var(--color-background);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.ai-status-title {
  font-size: 1.1rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.ai-status-item {
  padding: var(--spacing-sm) 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.ai-status-icon {
  font-size: 1.2rem;
}

.ai-spinner {
  animation: spin 1s linear infinite;
}