:root {
  color-scheme: light;
  --paper: #f3f1ec;
  --surface: #fbfaf7;
  --ink: #1c1a17;
  --muted: #686259;
  --line: #d8d2c7;
  --line-strong: #8f887d;
  --wash: #e8e3da;
  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "Segoe UI Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 2px;
}

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

html {
  background: var(--paper);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--ink);
  color: var(--paper);
}

h1,
h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

.wrap {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding-right: clamp(1rem, 5vw, 2rem);
  padding-left: clamp(1rem, 5vw, 2rem);
}

.site-header {
  padding: clamp(2.5rem, 6vw, 4rem) 0 clamp(2rem, 4.5vw, 3rem);
  border-top: 3px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.site-header h1 {
  font-size: clamp(2.15rem, 5.5vw, 3rem);
}

.amp {
  font-style: italic;
}

.tagline {
  max-width: 50ch;
  margin-top: 1rem;
  color: var(--muted);
  font-size: 1rem;
}

.section {
  padding: clamp(2.25rem, 5vw, 3.5rem) 0;
  border-bottom: 1px solid var(--line);
}

.section:last-child {
  border-bottom: 0;
}

.section h2 {
  font-size: clamp(1.5rem, 4vw, 1.9rem);
}

.note {
  max-width: 60ch;
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.micro-label {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  line-height: 1.4;
  text-transform: uppercase;
}

.course-table {
  --course-grid: minmax(0, 1fr) 5.5rem 7rem 2.75rem;
  margin-top: 1.65rem;
}

.course-head,
.course-row {
  display: grid;
  grid-template-columns: var(--course-grid);
  gap: 12px;
  align-items: end;
}

.course-head {
  align-items: center;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--ink);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.course-row {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

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

.course-row input,
.course-row select {
  width: 100%;
  min-width: 0;
  height: max(44px, 2.75rem);
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background-color: var(--surface);
  color: var(--ink);
  font-size: 1rem;
  transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.course-row select {
  padding-right: 34px;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%231c1a17' stroke-width='1.4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 10px 6px;
}

.course-row input::placeholder {
  color: #948d82;
  opacity: 1;
}

.course-row input:hover,
.course-row select:hover {
  border-color: var(--muted);
}

.course-row input:focus,
.course-row select:focus {
  outline: 2px solid var(--ink);
  outline-offset: 1px;
  border-color: var(--ink);
  background-color: #ffffff;
}

.course-row input[aria-invalid="true"],
.course-row select[aria-invalid="true"] {
  border-color: var(--ink);
  background-color: var(--wash);
  box-shadow: inset 0 0 0 1px var(--ink);
}

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

.remove-course {
  display: grid;
  place-items: center;
  width: max(44px, 2.75rem);
  height: max(44px, 2.75rem);
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  font-size: 1.35rem;
  line-height: 1;
  -webkit-appearance: none;
  appearance: none;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.remove-course:hover {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 1.35rem;
}

.btn {
  min-height: max(44px, 2.75rem);
  padding: 0 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 500;
  -webkit-appearance: none;
  appearance: none;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.btn:hover {
  border-color: var(--ink);
  background: var(--surface);
}

.btn-primary {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  border-color: #35322d;
  background: #35322d;
}

.btn-quiet {
  border-color: transparent;
  color: var(--muted);
}

.btn-quiet:hover {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--ink);
}

#reset,
#clear-semesters {
  margin-left: auto;
}

.btn:focus-visible,
.remove-course:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.message {
  margin-top: 0.9rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

.message:empty {
  margin-top: 0;
}

.message.error {
  padding: 0.65rem 0.8rem;
  border-left: 2px solid var(--ink);
  background: var(--wash);
}

.result {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(150px, 0.65fr);
  gap: 2rem;
  align-items: end;
  margin-top: 1.25rem;
  padding: clamp(1.15rem, 4vw, 1.65rem);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
}

.result[hidden] {
  display: none;
}

.gpa-value {
  display: block;
  margin: 0.2rem 0 0.9rem;
  font-family: var(--serif);
  font-size: clamp(3rem, 8vw, 4.5rem);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  letter-spacing: -0.05em;
  line-height: 0.88;
}

.result-class {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

#gpa-class {
  font-size: 0.95rem;
}

.result-figures {
  display: grid;
  gap: 13px;
  margin: 0;
}

.result-figures div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.25rem;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.result-figures div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.result-figures dt {
  color: var(--muted);
  font-size: 0.84rem;
}

.result-figures dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.45rem;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.semester-list {
  margin: 1.2rem 0 1.5rem;
  padding: 0;
  list-style: none;
}

.semester-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.2rem 1rem;
  padding: 0.7rem 0;
  font-size: 0.95rem;
}

.semester-list li + li {
  border-top: 1px solid var(--line);
}

.semester-list li:first-child:not(.empty) {
  border-top: 1px solid var(--line);
}

.semester-list li:last-child:not(.empty) {
  border-bottom: 1px solid var(--line);
}

.semester-list li.empty {
  padding: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.semester-detail {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.cgpa-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: end;
  padding: clamp(1.25rem, 4.5vw, 1.9rem);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
}

.cgpa-label {
  display: block;
  color: #bdb6aa;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.cgpa-detail {
  display: block;
  margin-top: 0.4rem;
  color: #c9c2b6;
  font-size: 0.86rem;
  line-height: 1.5;
}

.cgpa-value {
  font-family: var(--serif);
  font-size: clamp(3.1rem, 9vw, 4.6rem);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  letter-spacing: -0.05em;
  line-height: 0.85;
}

.scale-table {
  width: 100%;
  max-width: 340px;
  margin: 1.5rem 0 1.9rem;
  border-collapse: collapse;
}

.scale-table th {
  padding: 0 0 0.55rem;
  border-bottom: 1px solid var(--ink);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-align: left;
  text-transform: uppercase;
}

.scale-table td {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

.scale-table th:nth-child(2),
.scale-table td:nth-child(2) {
  width: 4.5rem;
  text-align: center;
}

.scale-table th:last-child,
.scale-table td:last-child {
  width: 4rem;
  text-align: right;
}

.formulas {
  margin: 0;
  border-top: 1px solid var(--line);
}

.formula-row {
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}

.formula-row dt {
  color: var(--muted);
  font-size: 0.88rem;
}

.formula-row dd {
  margin: 0;
  overflow-wrap: anywhere;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.5;
  text-align: right;
}

.formula-row code {
  font: inherit;
}

.example {
  max-width: 62ch;
  margin-top: 1.15rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer {
  padding: 1.35rem 0 2.25rem;
  border-top: 1px solid var(--line-strong);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.2rem 1.5rem;
}

.footer-inner p {
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 640px) {
  .course-table {
    --course-grid: minmax(0, 1fr) minmax(0, 1fr) 2.75rem;
  }

  .course-head {
    display: none;
  }

  .course-row {
    padding: 1rem 0;
    row-gap: 10px;
  }

  .field-code {
    grid-column: 1 / -1;
  }

  .field-label {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    line-height: 1.3;
    text-transform: uppercase;
  }

  .btn {
    width: 100%;
  }

  #reset,
  #clear-semesters {
    margin-left: 0;
  }

  .result {
    grid-template-columns: 1fr;
    gap: 1.4rem;
  }

  .result-figures {
    gap: 9px;
  }

  .result-figures div {
    padding-bottom: 8px;
  }
}

@media (max-width: 480px) {
  .tagline {
    font-size: 0.96rem;
  }

  .cgpa-box {
    grid-template-columns: 1fr;
    gap: 0.9rem;
  }

  .cgpa-value {
    font-size: 3rem;
  }

  .formula-row {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .formula-row dd {
    text-align: left;
  }

  .semester-list li {
    gap: 0.75rem;
    font-size: 0.9rem;
  }

  .semester-detail {
    font-size: 0.86rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}