/* ==========================================================================
   Cessaland — GPA Calculator
   ========================================================================== */

.gpa-hero {
  padding-block: var(--space-7) var(--space-6);
}

.gpa-hero__title {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 800;
}

.gpa-hero__desc {
  margin-top: var(--space-2);
  max-width: 56ch;
  color: var(--text-secondary);
  font-size: var(--fs-small);
}

.gpa-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: var(--space-6);
  align-items: start;
  padding-bottom: var(--space-9);
}

.gpa-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  min-width: 0;
}

.panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-6) 0;
}

.panel__head h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 700;
}

.panel__head p {
  color: var(--text-tertiary);
  font-size: var(--fs-micro);
}

/* ---- Cumulative fields ---------------------------------------------------- */

.cumulative-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 480px) {
  .cumulative-grid { grid-template-columns: 1fr; }
}

/* ---- Course table ----------------------------------------------------------- */

.course-table {
  display: flex;
  flex-direction: column;
}

.course-row {
  display: grid;
  grid-template-columns: 1fr 96px 96px 38px;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3) 0;
  border-top: 1px solid var(--border);
}

.course-row--head {
  border-top: none;
  padding-top: 0;
  padding-bottom: var(--space-2);
}

.course-row--head span {
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
  font-weight: 600;
}

.course-row .field__error {
  grid-column: 1 / -1;
  min-height: 0;
  font-size: 0.72rem;
  color: #e78d7c;
}

.course-row .field__error:empty {
  display: none;
}

/* ==========================================================================
   Mobile Optimization & Layout Fixes
   ========================================================================== */

@media (max-width: 900px) {
  .gpa-layout {
    grid-template-columns: 1fr;
  }
  .results {
    position: static;
  }
}

@media (max-width: 560px) {
  .course-row {
    grid-template-columns: 1fr 1fr 38px;
    grid-template-areas:
      "name name name"
      "credits grade remove"
      "error error error";
    gap: var(--space-2) var(--space-3);
  }
  .course-row--head { display: none; }
  
  .course-row > :nth-child(1) { grid-area: name; }
  .course-row > :nth-child(2) { grid-area: credits; }
  .course-row > :nth-child(3) { grid-area: grade; }
  .course-row > :nth-child(4) { 
    grid-area: remove; 
    justify-self: end;
    align-self: center;
  }
  .course-row > :nth-child(5) { grid-area: error; }
}

@media (max-width: 480px) {
  .gpa-hero { padding-block: var(--space-5) var(--space-4); }
  .gpa-hero__title { font-size: 1.6rem !important; }
  .gpa-hero__desc { font-size: 0.9rem !important; }

  .panel__head { padding: var(--space-4) var(--space-4) 0; }
  .panel__body { padding: var(--space-4); }
  
  .readout { padding: var(--space-4); }
  .readout__value { font-size: 2.2rem; }
  
  .cumulative-grid { grid-template-columns: 1fr; gap: var(--space-3); }
}

.course-table__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-4);
  margin-top: var(--space-2);
  border-top: 1px solid var(--border);
}

.course-table__hint {
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
}

/* ---- Results rail ----------------------------------------------------------- */

.results {
  position: sticky;
  top: calc(var(--space-4) + 64px);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.readout {
  padding: var(--space-6);
}

.readout__label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
  font-weight: 600;
}

.readout__value {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--fs-readout);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--amber-300);
  text-shadow: 0 0 24px rgba(232, 163, 61, 0.35);
  font-variant-numeric: tabular-nums;
  transition: opacity var(--dur-fast) var(--ease-lamp);
  text-align: center;
}

.readout__value.is-updating {
  opacity: 0.45;
}

.readout__sub {
  margin-top: var(--space-1);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
}

.readout__divider {
  margin: var(--space-5) 0;
  height: 1px;
  background: var(--border);
}

.readout__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

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

.readout__before span:first-child {
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
}

.readout__before b {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.delta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.3em 0.7em;
  border-radius: var(--radius-pill);
  font-size: var(--fs-micro);
  font-weight: 700;
  font-family: var(--font-mono);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.delta--up {
  color: var(--teal-300);
  border-color: rgba(79, 209, 197, 0.3);
  background: rgba(79, 209, 197, 0.08);
}

.delta--down {
  color: #e78d7c;
  border-color: rgba(224, 108, 90, 0.3);
  background: rgba(224, 108, 90, 0.08);
}

.results__note {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--surface-glass);
  border: 1px solid var(--border);
  color: var(--text-tertiary);
  font-size: 0.78rem;
  line-height: 1.7;
}

.results__note strong {
  color: var(--text-secondary);
}

.results__reset {
  align-self: center;
}

@media (max-width: 900px) {
  .gpa-layout {
    grid-template-columns: 1fr;
  }
  .results {
    position: static;
  }
}