:root {
  --background: 0 0% 96.1%; /* #F0F0F0 */
  --foreground: 0 0% 3.9%;
  --card: 0 0% 100%;
  --card-foreground: 0 0% 3.9%;
  --primary: 348 83% 42%; /* CMU Carnegie Red #C41230 */
  --primary-foreground: 0 0% 98%;
  --secondary: 0 0% 96.1%;
  --secondary-foreground: 0 0% 9%;
  --muted: 0 0% 96.1%;
  --muted-foreground: 0 0% 45.1%;
  --accent: 48 100% 50%; /* Gold #FFC107 */
  --accent-foreground: 0 0% 9%;
  --destructive: 0 84.2% 60.2%;
  --destructive-foreground: 0 0% 98%;
  --border: 0 0% 89.8%;
  --input: 0 0% 89.8%;
  --ring: 348 83% 42%;
  --radius: 0.5rem;            /* cards, buttons (8px) */
  --radius-control: 0.375rem;  /* icon buttons, small controls (6px) */
  --control-size: 2.25rem;     /* icon-button square, desktop (36px) */

  --hover-surface: 0 0% 92.5%;
  --hover-primary-tint: rgba(var(--color-primary-rgb), 0.1); /* primary @ 10% */

  --gold: 45 100% 46%; /* #E8B400 */

  /* focus rings */
  --focus-ring: 0 0 0 2px hsl(var(--background)), 0 0 0 4px hsl(var(--ring));
  --focus-ring-card: 0 0 0 2px hsl(var(--card)), 0 0 0 4px hsl(var(--ring));

  /* type scale */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.8125rem;  /* 13px */
  --text-base: 0.875rem; /* 14px */
  --text-md: 1rem;       /* 16px */

  /* motion */
  --transition: 0.2s;       /* standard UI micro-interaction */
  --transition-slow: 0.18s; /* drag settle / flip / chevron */

  --color-primary: hsl(348 83% 42%);
  --color-primary-rgb: 196, 18, 48;
  --color-muted-foreground: hsl(0 0% 45.1%);
  --color-border: hsl(0 0% 89.8%);

  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  color-scheme: light;
}

/* Grow all icon-button controls to a 44px touch target on mobile.
   Every control sized with var(--control-size) picks this up. */
@media (max-width: 639px) {
  :root {
    --control-size: 2.75rem;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  width: 100%;
  font-family: "Geist", Arial, Helvetica, sans-serif;
  background-color: hsl(var(--background));
  color: hsl(var(--foreground));
  -webkit-font-smoothing: antialiased;
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(var(--color-primary-rgb), 0.15);
}

.skip-link {
  position: absolute;
  left: 0.5rem;
  top: -3rem;
  z-index: 200;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius);
  background-color: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
  transition: top var(--transition) ease;
}
.skip-link:focus-visible {
  top: 0.5rem;
  outline: none;
  box-shadow: var(--focus-ring);
}

@media (min-width: 768px) {
  .calculator-viewport {
    padding-top: 3rem;
  }
}

.tabular-nums {
  font-variant-numeric: tabular-nums;
}

.qpa-value,
.semester-gpa-value,
.course-units-input {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  white-space: nowrap;
  border-radius: var(--radius);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition) ease, color var(--transition) ease, border-color var(--transition) ease;
  height: 2.5rem;
  padding: 0.5rem 1rem;
  background: transparent;
  color: inherit;
  font-family: inherit;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.btn:disabled {
  pointer-events: none;
  opacity: 0.5;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-default {
  background-color: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
}
.btn-default:hover {
  background-color: hsl(348 83% 34%);
}

.btn-outline {
  border-color: hsl(var(--input));
  background-color: hsl(var(--background));
  color: hsl(var(--foreground));
}
.btn-outline:hover {
  background-color: hsl(var(--hover-surface));
  color: hsl(var(--foreground));
  border-color: hsl(var(--border));
}

.btn-secondary {
  background-color: hsl(var(--secondary));
  color: hsl(var(--secondary-foreground));
}
.btn-secondary:hover {
  background-color: hsl(0 0% 86%);
}

.btn-ghost {
  background: transparent;
}
.btn-ghost:hover {
  background-color: hsl(var(--hover-surface));
  color: hsl(var(--foreground));
}

.btn-sm {
  height: 2.25rem;
  padding: 0 0.75rem;
}

.input {
  display: flex;
  height: 2.5rem;
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid hsl(var(--input));
  background-color: hsl(var(--card));
  padding: 0.5rem 0.75rem;
  font-size: var(--text-md);
  color: hsl(var(--foreground));
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input::placeholder {
  color: hsl(var(--muted-foreground));
}
.input:hover:not(:focus-visible) {
  border-color: rgba(var(--color-primary-rgb), 0.5);
}
.input:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
.input:disabled {
  opacity: 0.5;
  pointer-events: none;
}
@media (min-width: 768px) {
  .input {
    font-size: var(--text-base);
  }
}

.card {
  border-radius: var(--radius);
  border: 1px solid hsl(var(--border));
  background-color: hsl(var(--card));
  color: hsl(var(--card-foreground));
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.main-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.calculator-viewport {
  width: 100%;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 1rem;
}

.page-title {
  font-size: 1.625rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  color: black;
  padding-left: 1rem;
  padding-right: 1rem;
  text-align: center;
  text-wrap: balance;
}

.content-container {
  flex: 1;
  width: 100%;
  max-width: 56rem;
  padding-left: 1rem;
  padding-right: 1rem;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.page-footer {
  width: 100%;
  background-color: hsl(348 83% 42%);
  color: white;
}

.footer-container {
  max-width: 56rem;
  margin-left: auto;
  margin-right: auto;
  padding: 3rem 1.5rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 2rem;
}

.footer-section {
  max-width: 20rem;
  margin-bottom: 1rem;
}
.footer-section > div {
  margin-top: 1rem;
}

.footer-heading {
  font-weight: 700;
  font-size: 1.25rem;
  color: white;
  margin: 0;
}

.footer-subheading {
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  margin: 0 0 0.5rem;
}

.footer-text {
  font-size: var(--text-base);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.92);
  margin: 0;
}

.footer-copyright {
  font-size: var(--text-base);
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  color: rgba(255, 255, 255, 0.92);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem;
  transition: color var(--transition);
  width: fit-content;
  font-size: var(--text-base);
  text-decoration: none;
}
.footer-link:hover {
  color: white;
}

.footer-icon {
  height: 0.875rem;
  width: 0.875rem;
  opacity: 0.7;
  transition: opacity var(--transition);
}
.footer-link:hover .footer-icon {
  opacity: 1;
}

.space-y-2 > * + * {
  margin-top: 0.5rem;
}

@media (min-width: 768px) {
  .page-title {
    font-size: 2.125rem;
    margin-bottom: 1.5rem;
    padding-left: 0;
    padding-right: 0;
  }
  .content-container {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
  .footer-content {
    flex-direction: row;
    gap: 4rem;
  }
}

@media (min-width: 1024px) {
  .content-container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.qpa-container {
  width: 100%;
  margin: 0 auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  gap: 1.5rem;
}

.qpa-intro {
  max-width: 42rem;
  margin: 0 auto;
  text-align: center;
}

.qpa-intro-text {
  font-size: var(--text-base);
  color: var(--color-muted-foreground);
  font-weight: 500;
}

.qpa-disclaimer {
  margin: 0.5rem auto 0;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-muted-foreground);
}

.qpa-actions {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
}

.file-input-hidden {
  display: none;
}

.import-button,
.add-semester-button {
  width: 100%;
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
  font-size: var(--text-base);
}

.icon-slot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.icon-slot svg {
  height: 1rem;
  width: 1rem;
}

.button-icon svg,
.icon-slot[data-icon] svg {
  height: 1rem;
  width: 1rem;
}

.semester-scroll-area {
  border-radius: 0.375rem;
  border: 1px solid hsl(var(--border));
  margin: 0;
  align-self: stretch;
  flex: 1 1 0;
  min-height: 300px;
  max-height: min(760px, 78vh);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  /* Contains overflow so it doesn't add a stray page scrollbar */
  position: relative;
  overflow-y: auto;
  overscroll-behavior: contain;
  background-color: hsl(var(--card));
}

.semester-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
}

.semester-card {
  margin-bottom: 0.25rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.06);
  transition: box-shadow var(--transition) ease, transform var(--transition) ease;
}
.semester-card:hover {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05), 0 4px 10px rgba(0, 0, 0, 0.07);
}

.semester-header {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.375rem;
  padding: 0.75rem 0.875rem;
}

.semester-header-content {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  min-width: 0;
  flex: 1;
}

.semester-name-input {
  width: 100%;
  max-width: 20rem;
  font-weight: 600;
  font-size: 0.9375rem;
}

.semester-name-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.semester-name {
  font-weight: 600;
  font-size: var(--text-md);
  line-height: 1.2;
  overflow-wrap: anywhere;
  margin: 0;
}

.semester-edit-button {
  height: 1.5rem;
  width: 1.5rem;
  padding: 0;
  opacity: 0.7;
  flex-shrink: 0;
  transition: opacity var(--transition);
}
.semester-edit-button:hover {
  background-color: transparent;
  opacity: 1;
}
.semester-edit-icon svg {
  height: 0.875rem;
  width: 0.875rem;
  color: var(--color-muted-foreground);
}

.semester-gpa-container {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
.semester-gpa-label {
  font-size: var(--text-sm);
  color: var(--color-muted-foreground);
}
.semester-gpa-value {
  font-weight: 700;
  color: var(--color-primary);
}

.semester-delete-button {
  height: var(--control-size);
  width: var(--control-size);
  padding: 0;
  flex-shrink: 0;
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-control);
}
.semester-delete-button:hover {
  background-color: var(--hover-primary-tint);
  color: var(--color-primary);
}

.semester-delete-button .icon-slot svg,
.course-delete-button .icon-slot svg {
  margin-right: 0;
}

.card-content {
  padding: 1rem;
  padding-top: 0;
}

.course-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-base);
}

.course-table thead th {
  text-align: left;
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-muted-foreground);
  padding: 0.5rem 0.5rem;
  border-bottom: 1px solid hsl(var(--border));
}

.course-table td {
  padding: 0.375rem 0.5rem;
  vertical-align: middle;
}

.course-table .col-units {
  width: 5.5rem;
}

.course-table .col-grip {
  width: 2rem;
  text-align: center;
}

.course-table .col-grade {
  width: 9rem;
}

.course-table .col-actions {
  width: 3.25rem;
  text-align: right;
}

.course-name-input,
.course-units-input {
  width: 100%;
  height: 2.5rem;
}

.no-grade-text {
  color: var(--color-muted-foreground);
}

.course-delete-button {
  width: var(--control-size);
  height: var(--control-size);
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-control);
}
.course-delete-button:hover,
.course-delete-button:focus-visible {
  background-color: var(--hover-primary-tint);
  color: var(--color-primary);
}

.add-course-button {
  width: 100%;
  margin-top: 0.75rem;
}

.qpa-result {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
}
.qpa-label {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--color-muted-foreground);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}
.qpa-value {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-primary);
  margin: 0;
}
.qpa-subline {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-muted-foreground);
  margin: 0.25rem 0 0;
  min-height: 1.2em;
}

.grade-select {
  position: relative;
  width: 100%;
}

.course-grade-select {
  width: 100%;
  height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  border-radius: var(--radius);
  border: 1px solid hsl(var(--input));
  background-color: hsl(var(--card));
  padding: 0.5rem 0.75rem;
  font-size: var(--text-base);
  color: hsl(var(--foreground));
  cursor: pointer;
  font-family: inherit;
  transition: border-color var(--transition);
}
.course-grade-select:hover {
  border-color: rgba(var(--color-primary-rgb), 0.5);
}
.course-grade-select:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
.course-grade-select .chevron {
  flex-shrink: 0;
  opacity: 0.5;
}
.course-grade-select .grade-value {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.grade-listbox {
  position: absolute;
  z-index: 50;
  top: calc(100% + 4px);
  left: 0;
  min-width: 100%;
  width: max-content;
  max-width: min(18rem, calc(100vw - 2rem));
  max-height: 16rem;
  overflow-y: auto;
  background-color: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  padding: 0.25rem;
  margin: 0;
  list-style: none;
}
.grade-listbox[hidden] {
  display: none;
}

.grade-option {
  display: flex;
  align-items: baseline;
  justify-content: flex-start;
  gap: 0.5rem;
  padding: 0.4375rem 0.5rem;
  border-radius: 0.25rem;
  font-size: var(--text-base);
  cursor: pointer;
  user-select: none;
}
.grade-option:hover,
.grade-option.active {
  background-color: hsl(var(--hover-surface));
  color: hsl(var(--foreground));
}
.grade-option[aria-selected="true"] .grade-code {
  font-weight: 600;
  color: hsl(var(--primary));
}
.grade-code {
  flex-shrink: 0;
  min-width: 2rem;
}
.grade-hint {
  font-size: var(--text-xs);
  color: var(--color-muted-foreground);
}
.grade-group-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
  padding: 0.4375rem 0.5rem;
  border-top: 1px solid hsl(var(--border));
  border-radius: 0.25rem;
  font-size: var(--text-sm);
  color: var(--color-muted-foreground);
  cursor: pointer;
  user-select: none;
}
.grade-group-toggle:hover,
.grade-group-toggle.active {
  background-color: hsl(var(--hover-surface));
  color: hsl(var(--foreground));
}
.grade-toggle-label {
  font-weight: 600;
}
.grade-group-toggle .chevron {
  margin-left: auto;
  flex-shrink: 0;
  opacity: 0.6;
  transition: transform var(--transition-slow) ease;
}
.grade-group-toggle[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}
.grade-subgroup {
  list-style: none;
  margin: 0.125rem 0 0;
  padding: 0;
}
.grade-subgroup[hidden] {
  display: none;
}

.confirm-dialog {
  border: none;
  border-radius: var(--radius);
  padding: 0;
  max-width: 28rem;
  width: calc(100% - 2rem);
  background-color: hsl(var(--card));
  color: hsl(var(--card-foreground));
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  overscroll-behavior: contain;
}
.confirm-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
}
.dialog-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.dialog-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
  text-wrap: balance;
}
.dialog-description {
  font-size: var(--text-base);
  color: var(--color-muted-foreground);
  margin: 0;
}
.dialog-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.toast-region {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 24rem;
  width: calc(100% - 2rem);
}
.toast {
  border-radius: var(--radius);
  border: 1px solid hsl(var(--border));
  background-color: hsl(var(--card));
  color: hsl(var(--card-foreground));
  padding: 0.875rem 1rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
  animation: toast-in 0.18s ease-out;
}
.toast.destructive {
  border-color: hsl(var(--destructive));
  background-color: hsl(var(--destructive));
  color: hsl(var(--destructive-foreground));
}
.toast-title {
  font-weight: 600;
  font-size: 0.9375rem;
  margin: 0 0 0.125rem;
}
.toast-description {
  font-size: var(--text-sm);
  margin: 0;
  opacity: 0.95;
}
@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(0.5rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 639px) {
  .course-table,
  .course-table tbody,
  .course-table tr {
    display: block;
  }
  .course-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
  .course-table tbody tr.course-row {
    border: 1px solid hsl(var(--border));
    border-radius: var(--radius);
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    display: grid;
    grid-template-columns: auto 1fr 1fr auto;
    gap: 0.5rem 0.75rem;
    align-items: center;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  }
  .course-table tbody td {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
    padding: 0;
  }
  .course-table tbody td.col-course {
    grid-row: 1;
    grid-column: 2 / 4;
  }
  .course-table tbody td.col-grip {
    grid-row: 1;
    grid-column: 1;
    justify-self: start;
    align-items: center;
    justify-content: flex-start;
    padding: 0;
  }
  .course-table tbody td.col-grip::before {
    content: none;
  }
  .course-table tbody tr.course-row > td.col-grip {
    width: auto;
  }
  .course-table tbody td::before {
    content: attr(data-label);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted-foreground);
    flex-shrink: 0;
    white-space: nowrap;
  }
  .course-table tbody td.col-course::before {
    content: none;
  }
  .course-table tbody td.col-actions::before {
    content: none;
  }
  .course-name-input,
  .course-units-input,
  .course-grade-select {
    min-width: 0;
    flex: 1;
  }
  .course-table td.col-actions {
    grid-row: 1;
    grid-column: 4;
    justify-self: end;
    align-items: center;
  }
  .course-table td.col-units {
    grid-row: 2;
    grid-column: 2;
  }
  .course-table td.col-grade {
    grid-row: 2;
    grid-column: 3 / 5;
  }
  .course-name-input,
  .course-units-input,
  .course-grade-select {
    height: 2.25rem;
  }
  .course-name-input {
    font-weight: 500;
  }
  .course-delete-button {
    padding: 0;
  }
  .col-grade .grade-listbox {
    left: auto;
    right: 0;
  }
  .semester-scroll-area {
    min-height: 340px;
    max-height: 90vh;
  }
  .semester-edit-button {
    height: 1.75rem;
    width: 1.75rem;
  }
}

@media (min-width: 640px) {
  .qpa-intro-text {
    font-size: var(--text-md);
  }
  .qpa-actions {
    flex-direction: row;
    gap: 1rem;
  }
  .import-button,
  .add-semester-button {
    width: auto;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    font-size: var(--text-md);
  }
  .add-course-button {
    width: auto;
  }
  .qpa-value {
    font-size: 3rem;
  }
}

.drag-handle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--control-size);
  width: var(--control-size);
  padding: 0;
  border: none;
  background: transparent;
  color: var(--color-muted-foreground);
  border-radius: var(--radius-control);
  cursor: grab;
  opacity: 1;
  flex-shrink: 0;
  /* Stop the browser claiming the drag gesture for scrolling */
  touch-action: none;
  transition: opacity var(--transition), color var(--transition), background-color var(--transition);
}
.drag-handle:hover {
  opacity: 1;
  background-color: hsl(var(--hover-surface));
  color: hsl(var(--foreground));
}
.drag-handle:focus-visible {
  outline: none;
  opacity: 1;
  box-shadow: var(--focus-ring);
}
.drag-handle:active {
  cursor: grabbing;
}
.course-drag-handle {
  height: var(--control-size);
  opacity: 1;
}

.dragging {
  opacity: 0.5;
  cursor: grabbing;
}
.semester-card.dragging {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.drag-floating {
  position: fixed;
  margin: 0 !important;
  z-index: 1000;
  pointer-events: none;
  border-radius: var(--radius);
  background-color: hsl(var(--card));
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.22), 0 4px 10px rgba(0, 0, 0, 0.12);
  transform: scale(1.02);
  transform-origin: center;
  cursor: grabbing;
  will-change: top, left, transform;
}
.drag-float-table {
  table-layout: fixed;
  border-collapse: collapse;
  padding: 0.25rem 0.5rem;
  border: 1px solid hsl(var(--border));
}
.drag-float-table td {
  padding: 0.375rem 0.5rem;
}
.drag-floating.settling {
  transition: top var(--transition-slow) ease, left var(--transition-slow) ease, transform var(--transition-slow) ease;
  transform: scale(1);
}

/* Vacated slot becomes the gold drop-indicator gap */
.drag-origin {
  position: relative;
  outline: 2px dashed hsl(var(--gold));
  outline-offset: -2px;
  border-radius: var(--radius);
  background-color: hsl(var(--gold) / 0.07);
}
.semester-card.drag-origin > *,
tr.drag-origin > td,
tr.drag-origin > th {
  visibility: hidden;
}

.drag-flip {
  transition: transform var(--transition-slow) ease;
}

body.is-dragging,
body.is-dragging * {
  user-select: none;
  -webkit-user-select: none;
  cursor: grabbing !important;
}

.semester-collapse-button {
  height: var(--control-size);
  width: var(--control-size);
  padding: 0;
  flex-shrink: 0;
  border-radius: var(--radius-control);
  opacity: 0.6;
}
.semester-collapse-button:hover {
  opacity: 1;
}
.collapse-chevron svg {
  height: 1rem;
  width: 1rem;
  transition: transform var(--transition-slow) ease;
}
.semester-card.is-collapsed .collapse-chevron svg {
  transform: rotate(-90deg);
}

.clear-all-button {
  color: var(--color-muted-foreground);
}
.clear-all-button:hover {
  background-color: var(--hover-primary-tint);
  color: var(--color-primary);
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.toast-body {
  min-width: 0;
  flex: 1;
}
.toast-action {
  flex-shrink: 0;
  border: 1px solid currentColor;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  padding: 0.3125rem 0.625rem;
  border-radius: var(--radius-control);
  cursor: pointer;
}
.toast-action:hover {
  background-color: rgba(0, 0, 0, 0.06);
}
.toast-action:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-card);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .toast {
    animation: none;
  }
  .skip-link {
    transition: none;
  }
}