:root {
  --primary: #4361ee;
  --primary-light: #4361ee30;
  --dark: #121212;
  --darker: #0a0a0a;
  --text: #e0e0e0;
  --text-muted: #aaaaaa;
  --card-bg: #1e1e1e;
  --card-highlight: #282828;
  --border: #333333;
  --shadow: 0 4px 6px rgba(0,0,0,0.3);
  --red: #ff5a5a;
  --amber: #ffaa5a;
  --green: #5aff8a;
  --purple: #ae5aff;
  --geography: #10b981;
  --psychology: #ec4899;
  --sociology: #8b5cf6;
}

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

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--dark);
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

header {
  background-color: var(--darker);
  box-shadow: var(--shadow);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Montserrat', sans-serif;
}

.logo-icon {
  font-size: 1.5rem;
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

main {
  padding: 2rem 0;
}

.countdown-panel {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.next-exam {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.countdown {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  font-family: 'Montserrat', sans-serif;
  color: var(--primary);
}

.exam-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.exam-card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
  transition: transform 0.2s, box-shadow 0.2s;
}

.exam-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0,0,0,0.4);
}

.exam-card.geography {
  border-left-color: var(--geography);
}

.exam-card.psychology {
  border-left-color: var(--psychology);
}

.exam-card.sociology {
  border-left-color: var(--sociology);
}

.exam-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  font-family: 'Montserrat', sans-serif;
}

.exam-date {
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.exam-info {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.days-left {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  margin-top: 1rem;
  display: inline-block;
  font-family: 'Montserrat', sans-serif;
}

.days-left.urgent {
  background-color: rgba(255, 90, 90, 0.2);
  color: var(--red);
}

.days-left.near {
  background-color: rgba(255, 170, 90, 0.2);
  color: var(--amber);
}

.days-left.comfortable {
  background-color: rgba(90, 255, 138, 0.2);
  color: var(--green);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: 'Montserrat', sans-serif;
}

.section-icon {
  color: var(--primary);
}

.card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 15px rgba(0,0,0,0.4);
  background-color: var(--card-highlight);
}

.card-header {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.card-icon {
  margin-right: 0.75rem;
  color: var(--primary);
  font-size: 1.5rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  font-family: 'Montserrat', sans-serif;
}

.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.subject-card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.subject-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.4);
  background-color: var(--card-highlight);
}

.subject-color {
  height: 8px;
}

.color-geography {
  background-color: var(--geography);
}

.color-psychology {
  background-color: var(--psychology);
}

.color-sociology {
  background-color: var(--sociology);
}

.subject-content {
  padding: 1.5rem;
}

.subject-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Montserrat', sans-serif;
}

.subject-info {
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.progress-wrapper {
  margin-bottom: 1rem;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.progress-bar {
  height: 8px;
  background-color: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.progress-value {
  height: 100%;
  border-radius: 4px;
}

.progress-geography {
  background-color: var(--geography);
  width: 75%;
}

.progress-psychology {
  background-color: var(--psychology);
  width: 60%;
}

.progress-sociology {
  background-color: var(--sociology);
  width: 85%;
}

.subject-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 1rem;
}

.subject-meta {
  display: flex;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.btn {
  display: inline-block;
  background-color: var(--primary);
  color: white;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  text-decoration: none;
  transition: background-color 0.2s, transform 0.2s;
  border: none;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
}

.btn:hover {
  background-color: #3a56e4;
  transform: translateY(-2px);
}

.btn-sm {
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.resource-card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  padding: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.resource-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 15px rgba(0,0,0,0.4);
  background-color: var(--card-highlight);
}

.resource-icon {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.resource-title {
  font-weight: 700;
  margin-bottom: 0.5rem;
  font-family: 'Montserrat', sans-serif;
}

.resource-description {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.resource-card .btn {
  margin-top: auto;
  align-self: flex-start;
}

.tab-container {
  margin-bottom: 2rem;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tab {
  padding: 0.75rem 1.5rem;
  background-color: var(--card-bg);
  color: var(--text-muted);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
}

.tab:hover {
  background-color: var(--card-highlight);
}

.tab.active {
  background-color: var(--primary);
  color: white;
}

.tab-content {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.hidden {
  display: none;
}

.resource-list {
  list-style: none;
}

.resource-list li {
  margin-bottom: 1rem;
}

.resource-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--primary);
  text-decoration: none;
  padding: 0.75rem;
  border-radius: 0.5rem;
  transition: background-color 0.2s;
}

.resource-link:hover {
  background-color: var(--card-highlight);
}

.resource-list-icon {
  color: var(--primary);
  font-size: 1.25rem;
}

.weak-areas-list {
  list-style: none;
  margin-bottom: 1.5rem;
}

.weak-areas-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.weak-areas-list li:last-child {
  border-bottom: none;
}

.weak-areas-icon {
  color: var(--red);
  flex-shrink: 0;
}

.two-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .two-columns {
    grid-template-columns: 2fr 1fr;
  }
}

.message-card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.message-header {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.message-avatar {
  width: 40px;
  height: 40px;
  border-radius: 20px;
  background-color: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  margin-right: 1rem;
}

.message-name {
  font-weight: 600;
}

.message-time {
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-left: auto;
}

.message-content {
  color: var(--text);
  margin-bottom: 1rem;
}

.message-signature {
  font-style: italic;
  color: var(--text-muted);
  text-align: right;
  font-size: 0.875rem;
}

.footer {
  background-color: var(--darker);
  padding: 2rem 0;
  text-align: center;
  margin-top: 3rem;
}

.footer-text {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.copyright {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.mark-tip {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-left: 4px solid var(--primary);
}

.mark-tip-title {
  font-weight: 700;
  margin-bottom: 0.5rem;
  font-family: 'Montserrat', sans-serif;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.mark-tip-strategies {
  list-style: none;
  margin-top: 1rem;
}

.mark-tip-strategies li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.mark-tip-strategies li::before {
  content: "•";
  color: var(--primary);
  position: absolute;
  left: 0;
  font-weight: bold;
}

.table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}

.table th {
  background-color: var(--card-highlight);
  padding: 0.75rem;
  text-align: left;
  font-weight: 600;
  color: var(--text);
}

.table td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

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

.accent-geography {
  color: var(--geography);
}

.accent-psychology {
  color: var(--psychology);
}

.accent-sociology {
  color: var(--sociology);
}

/* Cornell Notes Style */
.cornell-container {
  display: grid;
  grid-template-columns: 25% 1fr;
  gap: 1rem;
  font-family: 'Inter', sans-serif;
  background: var(--card-bg);
  border: 2px solid var(--border);
  padding: 1rem;
  max-width: 900px;
  margin: auto;
  border-radius: 1rem;
  color: var(--text);
}

.cornell-cues {
  border-right: 2px solid var(--border);
  padding-right: 1rem;
}

.cornell-cues h3, .cornell-notes h3 {
  margin-top: 0;
  color: var(--text);
}

.cornell-cues ul {
  list-style-type: square;
  padding-left: 1rem;
  color: var(--text);
}

.cornell-summary {
  border-top: 2px solid var(--border);
  margin: 2rem auto 1rem auto;
  max-width: 900px;
  padding-top: 1rem;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background: var(--card-bg);
  border-radius: 0 0 1rem 1rem;
  padding: 1rem;
}

/* Tool Styles */
.tool-container {
  max-width: 850px;
  margin: 2rem auto;
  font-family: 'Inter', sans-serif;
  background: var(--card-bg);
  border: 2px solid var(--border);
  padding: 2rem;
  border-radius: 1rem;
  color: var(--text);
}

.tool-container h2 {
  margin-top: 0;
  color: var(--text);
}

.tool-container textarea, 
.tool-container input[type="text"],
.tool-container select {
  width: 100%;
  margin-bottom: 1rem;
  padding: 0.5rem;
  background-color: var(--darker);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 0.5rem;
}

.tool-container button {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  cursor: pointer;
  margin-bottom: 2rem;
}

.tool-container button:hover {
  background-color: #3a56e4;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .nav {
    gap: 1rem;
  }
  
  .cornell-container {
    grid-template-columns: 1fr;
  }
  
  .cornell-cues {
    border-right: none;
    border-bottom: 2px solid var(--border);
    padding-right: 0;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav {
    width: 100%;
    justify-content: space-between;
  }
  
  .countdown {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
}

/* API Integration Placeholder Styles */
.api-integration-section {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--purple);
}

.api-integration-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  font-family: 'Montserrat', sans-serif;
  color: var(--purple);
}

.api-status {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  margin-left: 0.5rem;
}

.api-status.connected {
  background-color: rgba(90, 255, 138, 0.2);
  color: var(--green);
}

.api-status.disconnected {
  background-color: rgba(255, 90, 90, 0.2);
  color: var(--red);
}

.api-placeholder {
  background-color: var(--darker);
  border-radius: 0.5rem;
  padding: 1rem;
  margin-top: 1rem;
  color: var(--text-muted);
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
}

/* Time Machine Feature */
.time-machine-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  background-color: var(--card-bg);
  padding: 1rem;
  border-radius: 0.5rem;
}

.time-machine-date {
  flex-grow: 1;
  padding: 0.5rem;
  background-color: var(--darker);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 0.5rem;
}

.time-machine-btn {
  background-color: var(--purple);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
}

.time-machine-btn:hover {
  background-color: #9a4aee;
}

.time-machine-indicator {
  position: fixed;
  top: 4.5rem;
  right: 1rem;
  background-color: var(--purple);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  z-index: 99;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}