/* CS498GC Mobile Robotics - Modern Style */
/* Adapted from UT Austin design with UIUC colors */

:root {
  --uiuc-navy: #13294B;
  --uiuc-orange: #BF5700;  /* UT Austin burnt orange - same as Prof. Yuke Zhu's site */
  --light-gray: #f7f6f1;
  --text-dark: #333;
  --border-light: #ddd;
}

/* Typography */
strong {
  font-weight: 550;
}

body {
  padding-top: 80px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
}

a {
  color: var(--uiuc-orange);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: var(--uiuc-navy);
  text-decoration: underline;
}

h2 {
  color: var(--uiuc-navy);
  font-weight: 600;
  margin-bottom: 1rem;
}

h4 {
  color: var(--uiuc-navy);
  margin-bottom: 1.0rem;
  font-weight: 600;
}

h5 {
  color: var(--text-dark);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

/* Layout Sections */
.content {
  padding-top: 40px;
}

.section {
  padding-top: 20px;
  padding-bottom: 10px;
}

.logistics {
  padding-bottom: 30px;
}

.bg-highlight {
  background-color: var(--light-gray);
  padding: 30px 0;
}

.bg-no-highlight {
  padding: 30px 0;
}

/* Navigation */
.navbar-dark {
  background-color: #BF5700 !important;  /* UT Austin burnt orange - matching Prof. Yuke Zhu's site */
  box-shadow: 0 2px 4px rgba(0,0,0,.1);
}

.navbar-brand {
  font-weight: 600;
  font-size: 1.3rem;
}

.navbar-dark .navbar-nav .nav-link {
  color: rgba(255,255,255,.9) !important;
  transition: color 0.3s ease;
}

.navbar-dark .navbar-nav .nav-link:hover {
  color: #fff !important;
  opacity: 0.8;
}

/* Staff Section */
.staff {
  display: inline-block;
  text-align: left;
  margin: 10px 20px 30px 0px;
}

.staff-photo img {
  height: 140px;
  width: 140px;
  object-fit: cover;
  object-position: center;
  margin-bottom: 10px;
  padding: 3px;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  transition: transform 0.3s ease;
}

.staff-photo img:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
}

.staff a:link,
.staff a:visited {
  color: var(--uiuc-orange);
  font-weight: 500;
}

.staff a:hover,
.staff a:active {
  color: var(--uiuc-navy);
}

/* Schedule Table */
.schedule-header th {
  padding: 12px;
  border-top: none;
  border-bottom: 2px solid var(--uiuc-navy);
  background-color: var(--light-gray);
  color: var(--uiuc-navy);
  font-weight: 600;
}

.schedule-row {
  border: none;
}

.schedule-row td {
  padding: 10px;
  border-bottom: 1px solid #e0e0e0;
}

.schedule-row:hover {
  background-color: #f9f9f9;
}

.holiday-row {
  background-color: #eef4ff;
}

.chapter-row {
  background-color: #fff9ed;
}

.chapter-row td {
  padding: 20px 0;
  text-align: center;
  font-weight: 600;
  color: var(--uiuc-navy);
}

/* Labels and Badges */
.label {
  display: inline-block;
  padding: .25em .6em;
  font-weight: 500;
  font-size: 85%;
  line-height: 1;
  color: #fff;
  text-align: center;
  white-space: nowrap;
  vertical-align: baseline;
  border-radius: .25rem;
}

.label-lecture {
  background-color: #6c757d;
}

.label-tutorial {
  background-color: var(--uiuc-orange);
}

.label-assignment {
  background-color: #28a745;
}

.label-quiz {
  background-color: #dc3545;
}

.label-project {
  background-color: var(--uiuc-navy);
}

/* Cards */
.card {
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  transition: transform 0.2s, box-shadow 0.2s;
  margin-bottom: 20px;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
}

.card-header {
  background-color: var(--uiuc-navy);
  color: white;
  font-weight: 600;
  border-radius: 8px 8px 0 0 !important;
}

.card-body {
  padding: 1.5rem;
}

/* Alerts */
.alert {
  border-radius: 8px;
  border: none;
}

.alert-info {
  background-color: #e3f2fd;
  color: #0d47a1;
  border-left: 4px solid var(--uiuc-navy);
}

.alert-warning {
  background-color: #fff3e0;
  color: #e65100;
  border-left: 4px solid var(--uiuc-orange);
}

/* Footer */
footer {
  margin-top: 60px;
  padding: 20px 0;
  background-color: #BF5700;  /* UT Austin burnt orange - matching navbar */
  color: white;
  text-align: center;
}

/* Lists */
li {
  margin: 10px 0;
}

.topic-cell ul {
  font-size: 90%;
  padding-left: 20px;
}

.topic-cell li {
  margin: 5px 0;
}

/* Responsive */
@media (max-width: 768px) {
  body {
    padding-top: 60px;
  }
  
  .staff-photo img {
    height: 120px;
    width: 120px;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  h4 {
    font-size: 1.3rem;
  }
}

/* Quick Info Cards */
.info-card {
  background: white;
  border-left: 4px solid var(--uiuc-orange);
  padding: 15px;
  margin-bottom: 20px;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,.05);
}

.info-card h5 {
  color: var(--uiuc-navy);
  margin-bottom: 10px;
}

/* Buttons */
.btn-primary {
  background-color: var(--uiuc-navy);
  border-color: var(--uiuc-navy);
}

.btn-primary:hover {
  background-color: var(--uiuc-orange);
  border-color: var(--uiuc-orange);
}

.btn-outline-primary {
  color: var(--uiuc-navy);
  border-color: var(--uiuc-navy);
}

.btn-outline-primary:hover {
  background-color: var(--uiuc-navy);
  border-color: var(--uiuc-navy);
}

/* Module Cards for Syllabus */
.module-card {
  margin-bottom: 30px;
  border: none;
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
}

.module-card .card-header {
  background: linear-gradient(135deg, var(--uiuc-navy) 0%, #1e3c72 100%);
  padding: 1rem 1.5rem;
}

.module-card .card-header h4 {
  color: white;
  margin-bottom: 0;
}