/* ============================================
   Timetable Enhancement Styles
   Modern UI/UX Design for Course Schedule Display
   Matching the Overall Design Language
   ============================================ */

/* ============================================
   CSS Variables for Consistent Theming
   ============================================ */

:root {
  --tt-primary: #5BA0F2;
  --tt-primary-light: #7DB8F8;
  --tt-primary-lighter: #A5CCFB;
  --tt-secondary: #6BA6F5;
  --tt-bg-light: #F9FAFB;
  --tt-bg-white: #FFFFFF;
  --tt-border: #E5E7EB;
  --tt-border-light: #F3F4F6;
  --tt-text-primary: #1F2937;
  --tt-text-secondary: #6B7280;
  --tt-text-light: #9CA3AF;
  --tt-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --tt-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --tt-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --tt-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Main Timetable Container
   ============================================ */

.timetable {
  background: var(--tt-bg-white) !important;
  border-radius: 16px !important;
  box-shadow: var(--tt-shadow-md) !important;
  padding: 20px !important;
  margin: 20px !important;
  overflow: auto !important;
  transition: var(--tt-transition) !important;
  height: calc(100vh - 100px) !important;
  max-height: calc(100vh - 100px) !important;
  display: flex !important;
  flex-direction: column !important;
}

.timetable:hover {
  box-shadow: var(--tt-shadow-lg) !important;
}

/* ============================================
   Timetable Header Redesign
   ============================================ */

.timetable-header {
  background: linear-gradient(135deg, var(--tt-bg-white) 0%, var(--tt-bg-light) 100%) !important;
  border-bottom: 2px solid var(--tt-border) !important;
  border-radius: 0 !important;
  padding: 16px 24px !important;
  height: auto !important;
  min-height: 60px !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04) !important;
}

/* Title styling */
.timetable-header .title {
  display: flex !important;
  align-items: center !important;
  gap: 0 !important;
}

.title-main {
  background: linear-gradient(135deg, var(--tt-primary) 0%, var(--tt-primary-light) 100%) !important;
  color: white !important;
  padding: 8px 16px !important;
  border-radius: 10px 0 0 10px !important;
  font-weight: 700 !important;
  font-size: 16px !important;
  letter-spacing: 0.5px !important;
}

.title-sub {
  background: white !important;
  color: var(--tt-primary) !important;
  border: 2px solid var(--tt-primary) !important;
  border-left: none !important;
  padding: 6px 16px 6px 14px !important;
  border-radius: 0 10px 10px 0 !important;
  font-weight: 600 !important;
  font-size: 16px !important;
}

/* Header buttons */
.timetable-header img {
  width: 36px !important;
  height: 36px !important;
  padding: 8px !important;
  background: white !important;
  border: 1px solid var(--tt-border) !important;
  border-radius: 50% !important;
  cursor: pointer !important;
  transition: var(--tt-transition) !important;
}

.timetable-header img:hover {
  background: var(--tt-primary-lighter) !important;
  border-color: var(--tt-primary) !important;
  transform: translateY(-2px) !important;
  box-shadow: var(--tt-shadow-md) !important;
}

.report-issue-btn {
  background: linear-gradient(135deg, white 0%, var(--tt-bg-light) 100%) !important;
  color: var(--tt-primary) !important;
  border: 2px solid var(--tt-border) !important;
  padding: 8px 20px !important;
  border-radius: 20px !important;
  font-weight: 600 !important;
  font-size: 14px !important;
  transition: var(--tt-transition) !important;
}

.report-issue-btn:hover {
  background: var(--tt-primary) !important;
  color: white !important;
  border-color: var(--tt-primary) !important;
  transform: translateY(-2px) !important;
  box-shadow: var(--tt-shadow-md) !important;
}

/* ============================================
   Table Structure Enhancement
   ============================================ */

#table-body {
  width: 100% !important;
  background: white !important;
  border-collapse: separate !important;
  border-spacing: 0 !important;
  border-radius: 12px !important;
  overflow: hidden !important;
  box-shadow: var(--tt-shadow-sm) !important;
  table-layout: fixed !important;
}

/* Table header */
#timetable-head {
  background: linear-gradient(135deg, var(--tt-primary-lighter) 0%, var(--tt-primary-light) 100%) !important;
}

#timetable-head th {
  padding: 16px 12px !important;
  font-weight: 700 !important;
  font-size: 14px !important;
  letter-spacing: 1px !important;
  color: rgb(0, 0, 0) !important;
  text-align: center !important;
  border: none !important;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1) !important;
}

#timetable-head th:first-child {
  background: linear-gradient(135deg, var(--tt-primary) 0%, var(--tt-secondary) 100%) !important;
  width: 80px !important;
}

/* Table body cells */
#timetable-output td {
  padding: 4px !important;
  border: 1px solid var(--tt-border-light) !important;
  /* background: var(--tt-bg-white) !important; */
  height: 45px !important;
  min-height: 45px !important;
  max-height: 45px !important;
  position: relative !important;
  transition: var(--tt-transition) !important;
}

/* Time column (first column) */
#timetable-output td:first-child {
  background: var(--tt-bg-light) !important;
  font-weight: 600 !important;
  font-size: 13px !important;
  color: var(--tt-text-secondary) !important;
  text-align: center !important;
  width: 80px !important;
  border-right: 2px solid var(--tt-border) !important;
}

/* Empty cells hover effect */
#timetable-output td:not(.timetableTd):not(:first-child):hover {
  background: linear-gradient(135deg, var(--tt-bg-light) 0%, white 100%) !important;
  cursor: pointer !important;
}

/* ============================================
   Course Block (timetableTd) Redesign
   ============================================ */

.timetableTd {
  /* Background color will be set inline by JavaScript */
  border-radius: 8px !important;
  padding: 8px 6px !important;
  margin: 2px !important;
  position: relative !important;
  overflow: hidden !important;
  cursor: pointer !important;
  transition: var(--tt-transition) !important;
  border: none !important;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

.timetableTd::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 8px 8px 0 0;
}

.timetableTd:hover {
  transform: translateY(-2px) scale(1.02) !important;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15) !important;
  z-index: 100 !important;
  filter: brightness(1.05) !important;
}

/* Course text styling */
.timetableTd b {
  display: block !important;
  color: #2c3e50 !important;
  text-shadow: none !important;
  line-height: 1.1 !important;
}

.timetableTd br {
  line-height: 0.1 !important;
}

.timetableTd b:first-child {
  font-size: 16px !important;
  font-weight: 700 !important;
  margin-bottom: 1px !important;
  margin-top: 8px !important;
  letter-spacing: 0.5px !important;
}

.timetableTd b:nth-child(2) {
  font-size: 13px !important;
  font-weight: 600 !important;
  opacity: 0.85 !important;
}

/* Lock icon styling */
.timetableTd .lock-icon {
  position: absolute !important;
  top: 6px !important;
  right: 6px !important;
  background: rgba(255, 255, 255, 0.9) !important;
  border-radius: 50% !important;
  width: 24px !important;
  height: 24px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  opacity: 0 !important;
  transition: var(--tt-transition) !important;
  cursor: pointer !important;
}

.timetableTd:hover .lock-icon {
  opacity: 1 !important;
}

.timetableTd .lock-icon:hover {
  background: white !important;
  transform: scale(1.1) !important;
}

.timetableTd .lock-icon i {
  font-size: 12px !important;
  color: var(--tt-primary) !important;
}

/* Locked state */
.timetableTd.locked {
  background: linear-gradient(135deg, var(--course-color, #5BA0F2) 0%, var(--course-color-dark, #4A90E2) 100%) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2) !important;
}

/* Locked indicator removed emoji */

/* ============================================
   Small View / Thumbnail Grid
   ============================================ */

#small-view {
  padding: 20px !important;
  background: var(--tt-bg-light) !important;
  border-radius: 12px !important;
  display: grid !important;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)) !important;
  gap: 20px !important;
  max-height: calc(100vh - 200px) !important;
  overflow-y: auto !important;
}

.timetable-thumbnail {
  background: white !important;
  border: 2px solid var(--tt-border) !important;
  border-radius: 12px !important;
  padding: 16px !important;
  cursor: pointer !important;
  transition: var(--tt-transition) !important;
  position: relative !important;
  overflow: hidden !important;
}

.timetable-thumbnail:hover {
  border-color: var(--tt-primary) !important;
  box-shadow: var(--tt-shadow-lg) !important;
  transform: translateY(-4px) !important;
}

.timetable-thumbnail.selected {
  border-color: var(--tt-primary) !important;
  background: linear-gradient(135deg, white 0%, var(--tt-primary-lighter) 100%) !important;
  box-shadow: 0 0 0 3px rgba(91, 160, 242, 0.2) !important;
}

.timetable-thumbnail::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--tt-primary) 0%, var(--tt-primary-light) 100%);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.timetable-thumbnail:hover::before {
  transform: scaleX(1);
}

/* ============================================
   Custom Scrollbar
   ============================================ */

.timetable::-webkit-scrollbar,
#small-view::-webkit-scrollbar {
  width: 8px !important;
  height: 8px !important;
}

.timetable::-webkit-scrollbar-track,
#small-view::-webkit-scrollbar-track {
  background: var(--tt-border-light) !important;
  border-radius: 4px !important;
}

.timetable::-webkit-scrollbar-thumb,
#small-view::-webkit-scrollbar-thumb {
  background: var(--tt-text-light) !important;
  border-radius: 4px !important;
}

.timetable::-webkit-scrollbar-thumb:hover,
#small-view::-webkit-scrollbar-thumb:hover {
  background: var(--tt-text-secondary) !important;
}

/* ============================================
   Animations
   ============================================ */

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

.timetableTd {
  animation: fadeIn 0.3s ease-out;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.timetableTd.just-added {
  animation: pulse 0.5s ease-out;
}

/* ============================================
   Loading State
   ============================================ */

.timetable.loading {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.timetable.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border: 4px solid var(--tt-border);
  border-top-color: var(--tt-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

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

@media (max-width: 768px) {
  .timetable {
    margin: 10px !important;
    padding: 10px !important;
    border-radius: 12px !important;
  }
  
  #table-body {
    font-size: 12px !important;
  }
  
  #timetable-head th {
    padding: 12px 8px !important;
    font-size: 12px !important;
  }
  
  .timetableTd b:first-child {
    font-size: 12px !important;
  }
  
  .timetableTd b:nth-child(2) {
    font-size: 10px !important;
  }
  
  .timetable-header {
    padding: 12px 16px !important;
  }
  
  .title-main,
  .title-sub {
    font-size: 14px !important;
    padding: 6px 12px !important;
  }
  
  #small-view {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)) !important;
  }
}

/* ============================================
   Color Palette for Courses
   ============================================ */

.course-color-1 { --course-color: #60A5FA; --course-color-light: #93BBFC; --course-color-dark: #3B82F6; }
.course-color-2 { --course-color: #A78BFA; --course-color-light: #C4B5FD; --course-color-dark: #8B5CF6; }
.course-color-3 { --course-color: #F472B6; --course-color-light: #F9A8D4; --course-color-dark: #EC4899; }
.course-color-4 { --course-color: #FB923C; --course-color-light: #FDB47E; --course-color-dark: #F97316; }
.course-color-5 { --course-color: #A3E635; --course-color-light: #BEF264; --course-color-dark: #84CC16; }
.course-color-6 { --course-color: #4ADE80; --course-color-light: #86EFAC; --course-color-dark: #22C55E; }
.course-color-7 { --course-color: #2DD4BF; --course-color-light: #6EE7DB; --course-color-dark: #14B8A6; }
.course-color-8 { --course-color: #FBBF24; --course-color-light: #FCD34D; --course-color-dark: #F59E0B; }

/* ============================================
   Modal and Overlay Improvements
   ============================================ */

#loading-overlay {
  background: rgba(0, 0, 0, 0.8) !important;
  backdrop-filter: blur(4px) !important;
}

#loading-overlay img {
  border-radius: 12px !important;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3) !important;
}

/* ============================================
   View Toggle Animation
   ============================================ */

.timetable-view {
  transition: opacity 0.3s ease, transform 0.3s ease;
  height: 100%;
  overflow: auto;
  display: flex;
  flex-direction: column;
}

.timetable-view:not(.active) {
  opacity: 0;
  transform: translateY(20px);
  position: absolute;
  pointer-events: none;
  display: none !important;
}

.timetable-view.active {
  opacity: 1;
  transform: translateY(0);
  position: relative;
  display: flex !important;
}

/* ============================================
   Course Details Hover Card
   ============================================ */

.timetableTd[title] {
  position: relative;
}

.timetableTd::after {
  content: attr(title);
  position: absolute;
  bottom: -30px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--tt-text-primary);
  color: white;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 1000;
}

.timetableTd:hover::after {
  opacity: 0;  /* Disabled for now, can enable if needed */
}

/* ============================================
   Empty State
   ============================================ */

#timetable-output:empty::after {
  content: "No schedule generated yet. Select courses and click 'Generate Schedule'.";
  display: block;
  padding: 40px;
  text-align: center;
  color: var(--tt-text-light);
  font-size: 16px;
  font-style: italic;
  grid-column: 1 / -1;
}