* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  padding-bottom: 140px;
}

.page {
  position: relative;
  max-width: 1680px;
  margin: 0 auto 40px;
  background: var(--panel-bg);
  padding: 24px;
  width: calc(100% - 48px);
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: 0 18px 36px var(--shadow);
  color: var(--heading);
}

.reset-gpa-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 8px 12px;
  border: none;
  border-radius: 10px;
  background: #b91c1c;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
}

.reset-gpa-btn:hover {
  background: #991b1b;
}

h1 {
  text-align: center;
  color: var(--heading);
  margin: 0 0 24px;
  padding: 0 170px;
  font-size: 26px;
  font-weight: 600;
}

.controls-header {
  margin-bottom: 20px;
}

.controls {
  display: flex;
  gap: 15px;
  flex-wrap: nowrap;
  align-items: flex-end;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-shrink: 0;
}

.control-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--heading);
  letter-spacing: 0.3px;
}

.control-group select {
  color-scheme: light;
  padding: 12px 16px;
  border: 1px solid var(--input-border);
  border-radius: 10px;
  font-size: 14px;
  width: 240px;
  background: var(--input-bg);
  color: var(--input-text);
  cursor: pointer;
  transition: all 0.3s ease;
  -webkit-appearance: none !important;
  -moz-appearance: none !important;
  appearance: none !important;
  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") !important;
  background-repeat: no-repeat !important;
  background-position: right 12px center !important;
  background-size: 12px !important;
  padding-right: 40px !important;
}

.control-group select::-moz-appearance {
  text-indent: 0.01px !important;
  text-overflow: "" !important;
}

.control-group select::-webkit-appearance {
  -webkit-appearance: none !important;
}

#version-select,
#extra-version-select {
  width: 380px;
}

.control-group select option {
  background: var(--input-bg);
  color: var(--input-text);
}

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

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

.control-group select:disabled {
  background: #f3f4f6;
  color: var(--body-text);
  opacity: 0.7;
  cursor: not-allowed;
  border-color: var(--input-border);
}

.extra-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--heading);
  cursor: pointer;
  user-select: none;
}

.extra-toggle.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.extra-toggle.is-disabled input {
  cursor: not-allowed;
}

.extra-controls {
  margin-top: 14px;
}

.extra-controls .controls {
  flex-wrap: wrap;
}

.status-message {
  margin: 0;
  font-size: 14px;
  color: var(--body-text);
}

.status-message.error {
  color: #b91c1c;
}

.plan-tables {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
}

.semester-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: stretch;
}

.extra-pair {
  grid-template-columns: 1fr;
}

.semester-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--table-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  color: var(--table-text);
}

.semester-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.semester-title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--heading);
}

.prediction-toolbar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.prediction-toggle-btn {
  grid-column: 2;
  justify-self: end;
  padding: 8px 12px;
  border: none;
  border-radius: 10px;
  background: #eab308;
  color: #422006;
  font-size: 13px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
}

.prediction-toggle-btn:hover {
  background: #ca8a04;
}

.prediction-toggle-btn.is-exit {
  background: #334155;
  color: #f8fafc;
}

.prediction-toggle-btn.is-exit:hover {
  background: #1e293b;
}

.plan-table-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-x: auto;
}

.plan-table {
  width: 100%;
  height: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: 13px;
  background: var(--table-bg);
  color: var(--table-text);
}

.plan-table th,
.plan-table td {
  border: 1px solid var(--border);
  padding: 6px 8px;
  text-align: left;
  color: var(--table-text);
  vertical-align: middle;
}

.plan-table th {
  background: var(--table-header-bg);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.2px;
}

.plan-table td {
  height: 44px;
}

.plan-table .col-credit {
  width: 96px;
  text-align: center;
}

.plan-table .col-code {
  width: 110px;
}

.plan-table .col-grade {
  width: 88px;
  overflow: visible;
}

.prediction-mode .plan-table-wrap {
  overflow: visible;
}

.grade-cell {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  /* Not kutusu–sütun çizgisi boşluğu (8px) çizginin her iki yanında */
  gap: 16px;
  position: relative;
  z-index: 2;
}

.grade-cell .grade-select:not(.raise-select) {
  flex: 0 0 auto;
  width: 72px;
  max-width: 72px;
}

.grade-cell .raise-select {
  flex: 0 0 auto;
  width: 118px;
  min-width: 118px;
  max-width: 118px;
}

.plan-table .col-scope {
  width: 150px;
}

.plan-table .col-remove {
  width: 42px;
  text-align: center;
}

.plan-table .credit-cell {
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.plan-table .code-cell,
.plan-table .name-cell {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.plan-table .empty-row td {
  border-color: var(--border);
}

.plan-table select,
.plan-table input[type="text"] {
  color-scheme: light;
  width: 100%;
  max-width: 100%;
  height: 32px;
  padding: 4px 8px;
  border: 1px solid var(--input-border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--input-text);
  font-size: 13px;
  font-family: inherit;
}

.plan-table select {
  cursor: pointer;
}

.plan-table select option {
  background: var(--input-bg);
  color: var(--input-text);
}

.plan-table select:disabled {
  background: #f3f4f6;
  opacity: 0.7;
  cursor: not-allowed;
}

.plan-table select:focus,
.plan-table input[type="text"]:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.15);
}

.plan-table .grade-select.is-pass {
  background: #dcfce7;
  border-color: #86efac;
  color: #166534;
}

.plan-table .grade-select.is-fail {
  background: #fee2e2;
  border-color: #fca5a5;
  color: #991b1b;
}

.plan-table .grade-select.is-pass:focus {
  border-color: #22c55e;
  box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2);
}

.plan-table .grade-select.is-fail:focus {
  border-color: #ef4444;
  box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.2);
}

.plan-table .grade-select.is-predict {
  background: #dbeafe;
  border-color: #93c5fd;
  color: #1d4ed8;
}

.plan-table .grade-select.is-predict:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.plan-table .grade-select.prediction-locked {
  pointer-events: none;
  cursor: default;
}

.extra-courses-actions {
  display: flex;
  justify-content: center;
  margin-top: 10px;
}

.extra-add-btn,
.extra-remove-btn {
  border: 1px solid var(--input-border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--heading);
  cursor: pointer;
  font-family: inherit;
}

.extra-add-btn {
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
}

.extra-remove-btn {
  width: 28px;
  height: 28px;
  padding: 0;
  font-size: 18px;
  line-height: 1;
}

.gpa-diff-info {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.gpa-diff-info h2 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 600;
  color: var(--heading);
}

.gpa-diff-info p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--body-text, var(--text));
}

.gpa-diff-info p:last-child {
  margin-bottom: 0;
}

.gpa-summary {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1100;
  min-width: 220px;
  padding: 14px 16px;
  background: var(--table-bg);
  color: var(--table-text);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 12px 28px var(--shadow);
}

.gpa-summary-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  color: var(--body-text);
}

.gpa-summary-row + .gpa-summary-row {
  margin-top: 8px;
}

.gpa-summary-row strong {
  font-size: 16px;
  font-variant-numeric: tabular-nums;
  color: var(--heading);
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  white-space: nowrap;
}

.gpa-delta {
  font-size: 13px;
  font-weight: 700;
}

.gpa-delta.is-up {
  color: #16a34a;
}

.gpa-delta.is-down {
  color: #dc2626;
}

@media (max-width: 900px) {
  .topbar {
    flex-wrap: wrap;
    gap: 8px;
  }

  .topbar-right {
    flex-wrap: wrap;
    flex: 1;
    min-width: 0;
    justify-content: flex-end;
  }

  .auth-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  h1 {
    font-size: 22px;
    padding: 0;
  }

  .reset-gpa-btn {
    position: static;
    display: block;
    margin: 0 0 12px auto;
  }

  .controls {
    flex-wrap: wrap;
  }

  .control-group select,
  #version-select,
  #extra-version-select {
    width: 100%;
    min-width: 220px;
  }

  .semester-pair {
    grid-template-columns: 1fr;
  }

  .prediction-toolbar {
    grid-template-columns: 1fr;
  }

  .prediction-toggle-btn {
    grid-column: 1;
    white-space: normal;
    text-align: center;
    font-size: 12px;
    max-width: 100%;
  }

  .gpa-summary {
    right: 12px;
    bottom: 12px;
    min-width: 180px;
  }
}