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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: #f5f5f5;
  padding: 20px;
  min-height: 100vh;
  overflow-x: auto;
}

.container {
  max-width: 100%;
  margin: 0 auto;
  background: transparent;
  padding: 25px;
  width: 100%;
}

h1 {
  margin-bottom: 25px;
  color: #333;
  text-align: center;
  font-size: 28px;
  font-weight: 600;
}

/* Takvim yönetimi */
.calendar-manager {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.calendar-manager label {
  font-size: 13px;
  color: #555;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.calendar-manager select {
  padding: 12px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  font-size: 14px;
  min-width: 220px;
  background: white;
  color: #333;
  cursor: pointer;
  transition: all 0.3s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 12px;
  padding-right: 40px;
}

.calendar-manager select:hover {
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.calendar-manager select:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.calendar-actions {
    display: flex;
    gap: 8px;
  align-items: center;
}

.calendar-action-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: #e0e0e0;
  color: #333;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.calendar-action-btn:hover {
  background: #d0d0d0;
  transform: translateY(-1px);
}

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

.hidden {
  display: none !important;
}

/* Alternatif CRN */
.alt-crn-container {
  display: flex;
  justify-content: center;
  margin: 10px 0 20px;
}

.alt-crn-btn {
  padding: 12px 26px;
  background: #9B5A6C;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  height: 46px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 6px rgba(155, 90, 108, 0.3);
}

.alt-crn-btn:hover {
  background: #8B4A5C;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(155, 90, 108, 0.4);
}

.alt-controls {
  display: flex;
  justify-content: center;
  gap: 16px;
  align-items: center;
  margin-bottom: 10px;
  flex-wrap: wrap;
  width: 100%;
}

.alt-controls.hidden {
  display: none !important;
}

.alt-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: #333;
}

.alt-nav-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background: #e0e0e0;
  color: #333;
  cursor: pointer;
  font-weight: 700;
}

.alt-nav-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.alt-actions {
  display: flex;
  gap: 10px;
}

.alt-action-btn {
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: #e0e0e0;
  color: #333;
  font-weight: 600;
}

.alt-action-btn.primary {
  background: #6B8FA3;
  color: white;
}

.pin-toggle {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 2px solid #e0e0e0;
  background: #d9d9d9 !important; /* Açık, soluk gri */
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: #4a4a4a;
  appearance: none;
  -webkit-appearance: none;
}

.pin-toggle.hidden {
  display: none !important;
}

.pin-toggle.active {
  border-color: #5A7D5A;
  background: #5A7D5A !important; /* Mat yeşil */
  color: white;
}

h2 {
  margin-bottom: 15px;
  color: #333;
  font-size: 18px;
  font-weight: 600;
}

/* Filtreler */
.filters {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  padding: 0;
  align-items: end;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.filter-group label {
  font-size: 13px;
  color: #555;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.filters select,
.course-selection select {
  padding: 12px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  font-size: 14px;
  min-width: 200px;
  background: white;
  color: #333;
  cursor: pointer;
  transition: all 0.3s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 12px;
  padding-right: 40px;
}

.filters select:hover,
.course-selection select:hover {
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.filters select:focus,
.course-selection select:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.filters button {
  padding: 12px 24px;
  background: #6B8FA3;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  height: 48px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 6px rgba(107, 143, 163, 0.3);
  letter-spacing: 0.3px;
}

.filters button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(107, 143, 163, 0.4);
  background: #5B7F93;
}

.filters button:active {
  transform: translateY(0);
}

.course-selection button {
  padding: 12px 24px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  height: 48px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  letter-spacing: 0.3px;
}

.course-selection button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.course-selection button:active {
  transform: translateY(0);
}

/* Ders Seçimi */
.course-selection-container {
  margin-bottom: 20px;
}

.course-selection-header {
  display: flex;
  gap: 15px;
  align-items: center;
  margin-bottom: 15px;
}

.yeni-ders-btn {
  padding: 12px 24px;
  background: #D4A574;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  height: 48px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 6px rgba(212, 165, 116, 0.3);
}

.yeni-ders-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(212, 165, 116, 0.4);
  background: #C49564;
}

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

.course-selection-form-wrapper {
  position: relative;
  margin-bottom: 15px;
}

.course-selection {
  display: flex;
  gap: 15px;
  padding: 0;
  align-items: end;
  flex-wrap: wrap;
}

.form-remove-btn {
  position: absolute;
  top: 9px; /* Select yüksekliği 48px -> (48-30)/2 = 9px */
  right: 0;
  width: 30px;
  height: 30px;
  background: #e74c3c;
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 20px;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  box-shadow: 0 2px 6px rgba(231, 76, 60, 0.3);
  z-index: 10;
}

.form-remove-btn:hover {
  background: #c0392b;
  transform: scale(1.1);
  box-shadow: 0 3px 8px rgba(231, 76, 60, 0.4);
}

.form-remove-btn:active {
  transform: scale(0.95);
}

.selection-group {
    display: flex;
  flex-direction: column;
    gap: 8px;
}

.credit-display {
  min-width: 110px;
  height: 48px;
  display: flex;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  color: #555;
  white-space: nowrap;
}

.credit-display.empty {
  opacity: 0.7;
}

.selection-group label {
  font-size: 13px;
  color: #555;
  font-weight: 600;
  letter-spacing: 0.3px;
}

#ders {
  min-width: 300px;
}

#crn {
  min-width: 250px;
}

/* Seçilen Dersler */
.selected-courses {
  margin-bottom: 20px;
}

#course-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.course-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-radius: 12px;
  border-left: 5px solid;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.course-item:hover {
  transform: translateX(5px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.course-item-info {
  flex: 1;
}

.course-item-code {
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 6px;
  color: #333;
}

.course-item-name {
  font-size: 14px;
  color: #666;
  margin-bottom: 4px;
}

.course-item-details {
  font-size: 12px;
  color: #888;
}

.course-item-remove {
  padding: 8px 18px;
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(245, 87, 108, 0.3);
}

.course-item-remove:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(245, 87, 108, 0.4);
}

.course-item-remove:active {
  transform: scale(0.98);
}

/* Takvim */
.calendar-container {
  overflow-x: visible;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 0;
  width: 100%;
}

.download-btn {
  padding: 12px 24px;
  background: #6B8FA3;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  height: 48px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 6px rgba(107, 143, 163, 0.3);
}

.download-btn:hover {
  background: #5B7F93;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(107, 143, 163, 0.4);
}

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

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

/* CRN Doldur */
.crn-fill-block {
  display: flex;
  align-items: center;
  gap: 10px;
}

.crn-fill-btn {
  padding: 10px 20px;
  background: #6A8D6A; /* Mat yeşil */
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  height: 46px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 6px rgba(106, 141, 106, 0.3);
}

.crn-fill-btn:hover {
  background: #5A7D5A;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(106, 141, 106, 0.4);
}

.crn-fill-btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.total-credit {
  font-size: 13px;
  font-weight: 600;
  color: #555;
  white-space: nowrap;
}

  #calendar {
    position: relative;
  border: 2px solid #e0e0e0;
  background: white;
  height: 560px;
  width: 1600px;
  min-width: 1600px;
  max-width: 1600px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.calendar-header {
  display: grid;
  grid-template-columns: 60px repeat(5, 1fr);
  border-bottom: 2px solid #ddd;
  background: #7A7A7A;
  height: 45px;
  position: relative;
  z-index: 1;
  width: 100%;
}

.calendar-time-header {
  padding: 12px;
  text-align: center;
  font-weight: 600;
  border-right: 1px solid rgba(255,255,255,0.2);
  color: white;
  font-size: 13px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calendar-day-header {
  padding: 12px;
  text-align: center;
  font-weight: 600;
  border-right: 1px solid rgba(255,255,255,0.2);
  color: white;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calendar-day-header:last-child {
  border-right: none;
}

.calendar-body {
  position: relative;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
  height: 515px;
  margin-left: 60px;
  width: calc(100% - 60px);
}

.calendar-time-label {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 10px;
  font-size: 11px;
  color: #555;
  font-weight: 600;
  z-index: 5;
  pointer-events: none;
  background: transparent;
  border-right: 1px solid #e0e0e0;
}

.calendar-day-slot {
  border-right: 1px solid #eee;
  border-bottom: 1px solid #eee;
  height: 25.75px;
  position: relative;
  background: white;
}

.calendar-day-slot:last-child {
  border-right: none;
}

  .course-block {
    position: absolute;
  border-radius: 6px;
  padding: 4px 6px;
  font-size: 10px;
  color: white;
  cursor: pointer;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  border: 1px solid rgba(255,255,255,0.2);
  z-index: 10;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
  text-align: left;
  transition: all 0.2s ease;
}

.course-block:hover {
  box-shadow: 0 3px 10px rgba(0,0,0,0.25);
  z-index: 20;
  transform: scale(1.02);
  transition: all 0.2s ease;
}

.course-block-time {
  font-weight: 600;
  margin-bottom: 3px;
  font-size: 10px;
  line-height: 1.2;
  opacity: 0.95;
  text-align: left;
}

.course-block-code {
  font-weight: 700;
  margin-bottom: 2px;
  font-size: 11px;
  line-height: 1.3;
  text-align: left;
}

.course-block-name {
  font-size: 9px;
  opacity: 0.95;
  line-height: 1.2;
  margin-bottom: 2px;
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  max-height: 2.4em;
}

.course-block-method {
  font-size: 9px;
  font-weight: 600;
  opacity: 0.95;
  line-height: 1.2;
  margin-bottom: 2px;
  text-align: left;
}

.course-block-instructor {
  font-size: 8px;
  opacity: 0.9;
  line-height: 1.2;
  margin-top: 2px;
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-block-location {
  font-size: 8px;
  opacity: 0.85;
  line-height: 1.2;
  margin-top: 1px;
  text-align: left;
    overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Bilgilendirme Bölümü */
.info-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-top: 40px;
  padding: 0 20px;
}

.info-box {
  background: white;
  border-radius: 12px;
  padding: 25px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.info-box h2 {
  color: #333;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #e0e0e0;
}

.info-box ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.info-box li {
  color: #555;
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 12px;
  padding-left: 25px;
  position: relative;
}

.info-box li:before {
  content: "•";
  color: #6B8FA3;
  font-weight: bold;
  font-size: 20px;
  position: absolute;
  left: 0;
  top: -2px;
}

.info-box li:last-child {
  margin-bottom: 0;
}

.info-box a {
  color: #4F6F86;
  text-decoration: none;
  font-weight: 700;
  transition: color 0.2s ease;
}

.info-box a:hover {
  color: #5B7F93;
  text-decoration: underline;
}

@media (max-width: 1200px) {
  .info-section {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 900px) {
  body {
    padding: 12px;
    overflow-x: hidden;
  }

  #calendar {
    width: 100%;
    min-width: 0;
    max-width: 100%;
  }

  .calendar-container {
    padding: 10px 0;
  }

  .calendar-day-header {
    font-size: 12px;
    letter-spacing: 0.2px;
  }

  .calendar-time-label {
    font-size: 10px;
    padding-right: 6px;
  }
}

body.popup-open {
  overflow: hidden;
}

.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 9999;
}

.popup {
  background: #ffffff;
  border-radius: 14px;
  padding: 24px 24px 22px;
  max-width: 520px;
  width: min(520px, 100%);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  position: relative;
}

.popup h2 {
  margin-bottom: 10px;
}

.popup p {
  color: #444;
  line-height: 1.6;
  font-size: 14px;
}

.popup a {
  color: #4F6F86;
  font-weight: 700;
  text-decoration: none;
}

.popup a:hover {
  text-decoration: underline;
}

.popup-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: #f0f0f0;
  color: #333;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.popup-close:hover {
  background: #e2e2e2;
}