:root {
  --panel: var(--surface-card);
  --panel-raised: var(--surface-elevated);
  --line: var(--border-subtle);
  --line-strong: var(--border-medium);
  --text-soft: var(--text-secondary);
  --muted: var(--text-muted);
  --app-accent: var(--accent);
  --success: var(--accent);
  --danger: #dc2626;
  --sans: var(--font-sans);
  --mono: var(--font-mono);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { min-width: 320px; min-height: 100%; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--text-primary);
  background: var(--bg-primary);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
button, input, select { font: inherit; }
button, input, select { -webkit-tap-highlight-color: transparent; }
button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible {
  outline: 2px solid var(--app-accent);
  outline-offset: 3px;
}

.app-shell { width: min(1080px, calc(100% - 48px)); margin: 0 auto; padding: 26px 0 72px; }
.app-header { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 27px; }
.brand { display: inline-flex; min-width: 0; align-items: center; gap: 12px; color: var(--text-primary); font-size: 14px; font-weight: 800; letter-spacing: -.025em; text-decoration: none; }
.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--accent);
  border-radius: 13px;
  background: var(--app-accent);
  box-shadow: var(--shadow-subtle);
  color: var(--bg-primary);
}
.brand-mark svg { width: 31px; height: 31px; }
.brand-name { line-height: 1.2; }
.header-actions { display: flex; gap: 8px; }
.quiet-button {
  min-height: 48px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color .16s ease, color .16s ease, background .16s ease;
}
.quiet-button:hover { border-color: var(--line-strong); color: var(--text-primary); background: var(--panel-raised); }

.setup-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 17px;
  padding: 21px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--panel);
  box-shadow: var(--shadow-subtle);
}
.field-label { display: grid; min-width: 0; gap: 8px; color: var(--text-secondary); font-size: 13px; font-weight: 700; }
.field-label input, .select-trigger, .custom-form input, .search-field input {
  width: 100%;
  min-width: 0;
  height: 50px;
  padding: 0 16px;
  border: 1px solid var(--border-subtle);
  border-radius: 9px;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  font-size: 15px;
  transition: border-color .16s ease, box-shadow .16s ease, background-color .16s ease;
}
.field-label input::placeholder { color: var(--text-muted); }
.field-label input:focus, .select-trigger:focus, .custom-form input:focus, .search-field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
  outline: none;
}
/* Custom Dropdowns */
.custom-dropdown {
  position: relative;
  width: 100%;
  min-width: 0;
  cursor: pointer;
}
.dropdown-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-width: 0;
  height: 50px;
  padding: 0 16px;
  border: 1px solid var(--border-subtle);
  border-radius: 9px;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  font-size: 15px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: border-color .16s ease, box-shadow .16s ease, background-color .16s ease;
}
[data-theme="light"] .dropdown-trigger {
  background-color: #F7F5F0;
  border-color: var(--border-subtle);
  color: #121211;
}
[data-theme="dark"] .dropdown-trigger {
  background-color: #121211;
  border-color: #2A2A28;
  color: #F7F5F0;
}
.dropdown-trigger:hover, .custom-dropdown.is-open .dropdown-trigger {
  border-color: var(--accent);
}
.dropdown-trigger:focus-visible {
  outline: 2px solid var(--app-accent);
  outline-offset: 3px;
}
.dropdown-arrow {
  font-size: 10px;
  color: var(--text-muted);
  transition: transform .16s ease;
}
.custom-dropdown.is-open .dropdown-arrow {
  transform: rotate(180deg);
}
.dropdown-menu {
  position: absolute;
  z-index: 70;
  top: calc(100% + 4px);
  right: 0;
  left: 0;
  max-height: 250px;
  overflow-y: auto;
  padding: 4px;
  border-radius: 10px;
  box-shadow: var(--shadow-medium);
}
[data-theme="light"] .dropdown-menu {
  background-color: #FFFFFF;
  border: 1px solid var(--border-subtle);
}
[data-theme="dark"] .dropdown-menu {
  background-color: #18181B;
  border: 1px solid #2A2A28;
}
.dropdown-menu[hidden] { display: none; }
.dropdown-option {
  display: flex;
  width: 100%;
  min-height: 42px;
  align-items: center;
  padding: 0 12px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  font: 500 14px var(--sans);
  text-align: left;
  cursor: pointer;
}
[data-theme="light"] .dropdown-option { color: #121211; }
[data-theme="dark"] .dropdown-option { color: #F7F5F0; }
.dropdown-option:hover, .dropdown-option.is-active, .dropdown-option[aria-selected="true"] {
  background-color: var(--accent);
  color: #FFFFFF !important;
}

.select-control {
  position: relative;
  width: 100%;
  min-width: 0;
}
.select-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 16px;
  font-size: 15px;
  text-align: left;
  cursor: pointer;
}
.select-trigger::after {
  width: 0;
  height: 0;
  flex: 0 0 auto;
  border-top: 5px solid var(--text-muted);
  border-right: 5px solid transparent;
  border-left: 5px solid transparent;
  content: "";
}
.select-trigger:hover, .select-control.is-open .select-trigger {
  border-color: var(--line-strong);
  background-color: var(--surface-card);
}
.select-trigger:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.select-menu {
  position: absolute;
  z-index: 30;
  top: calc(100% + 4px);
  right: 0;
  left: 0;
  max-height: 250px;
  overflow-y: auto;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-raised);
  box-shadow: var(--shadow-medium);
}
.select-menu[hidden] { display: none; }
.select-option {
  display: flex;
  width: 100%;
  min-height: 42px;
  align-items: center;
  padding: 0 12px;
  border: 0;
  border-radius: 6px;
  color: var(--text-primary);
  background: transparent;
  font: 500 14px var(--sans);
  text-align: left;
  cursor: pointer;
}
.select-option:hover, .select-option.is-active { background: var(--accent-tint); }
.select-option[aria-selected="true"] {
  color: var(--accent);
  font-weight: 700;
}

.mode-tabs {
  display: flex;
  width: min(500px, 100%);
  gap: 5px;
  margin: 23px auto 0;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--bg-secondary);
}
.mode-tab {
  flex: 1;
  min-height: 48px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: color .16s ease, background .16s ease, box-shadow .16s ease;
}
.mode-tab:hover { color: var(--text-primary); }
.mode-tab.is-active {
  border-color: var(--accent-muted);
  color: var(--app-accent);
  background: var(--accent-tint);
  box-shadow: var(--shadow-subtle);
}

.elective-picker-section {
  margin-top: 20px;
  padding: 24px 24px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  box-shadow: var(--shadow-subtle);
}
.elective-picker-header {
  margin-bottom: 16px;
}
.elective-picker-title {
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 4px;
}
.elective-picker-description {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 400;
  text-transform: none;
}
.elective-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.elective-checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all .16s ease;
  min-height: 44px;
}
.elective-checkbox-label:hover {
  border-color: var(--accent);
  background: var(--accent-tint);
}
.elective-checkbox-label input[type="checkbox"] {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-subtle);
  border-radius: 6px;
  background: var(--bg-primary);
  cursor: pointer;
  transition: all .16s ease;
  flex-shrink: 0;
  position: relative;
}
.elective-checkbox-label input[type="checkbox"]:hover {
  border-color: var(--accent);
}
.elective-checkbox-label input[type="checkbox"]:checked {
  border-color: var(--accent);
  background: var(--accent);
}
.elective-checkbox-label input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border: solid var(--text-on-accent, #fff);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.elective-checkbox-label:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-tint);
  color: var(--accent);
}
.elective-checkbox-label .elective-name {
  flex: 1;
}
.elective-checkbox-label .elective-badge {
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-tertiary, var(--bg-primary));
  padding: 2px 8px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: .03em;
  font-weight: 600;
}
.elective-checkbox-label:has(input:checked) .elective-badge {
  color: var(--accent);
  background: var(--accent-tint);
}
.subject-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.subject-card {
  position: relative;
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow-subtle);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.subject-card:hover { transform: translateY(-2px); border-color: var(--line-strong); box-shadow: var(--shadow-medium); }
.subject-card:has(.custom-dropdown.is-open) {
  z-index: 50;
}
.custom-dropdown.is-open {
  z-index: 60;
}
.subject-card.is-excluded {
  opacity: .55;
  filter: grayscale(.15);
}
/* The card body is not interactive while excluded, but the "use this
   instead" control stays clickable so the student can switch. */
.subject-card.is-excluded .subject-fields { pointer-events: none; }
.subject-card.is-excluded .subject-heading h2::after {
  content: " — excluded";
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.subject-card__switch {
  width: 100%;
  min-height: 34px;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--app-accent);
  background: var(--accent-tint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color .18s ease, background .18s ease;
}
.subject-card__switch:hover { border-color: var(--app-accent); background: var(--accent-muted); }
.subject-card__switch[hidden] { display: none; }
.subject-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 34px; margin-bottom: 18px; }
.subject-heading h2 { overflow: hidden; margin: 0; color: var(--text-primary); font-size: 16px; font-weight: 700; text-overflow: ellipsis; }
.subject-grade {
  display: inline-grid;
  min-width: 42px;
  height: 34px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: var(--bg-primary);
  font: 700 12px var(--mono);
}
.subject-grade.is-ready { border-color: var(--accent-muted); color: var(--success); background: var(--accent-tint); }
.subject-grade.is-ng { border-color: var(--accent-muted); color: var(--danger); background: var(--accent-tint); }
.subject-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.component-field { display: grid; min-width: 0; gap: 8px; }
.component-label { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--text-secondary); font-size: 12px; font-weight: 600; }
.component-label small { color: var(--text-muted); font-size: 11px; font-weight: 500; white-space: nowrap; }
.mark-input {
  width: 100%;
  height: 50px;
  padding: 0 16px;
  border: 1px solid var(--border-subtle);
  border-radius: 9px;
  color: var(--text-primary);
  background: var(--bg-primary);
  font: 600 15px var(--mono);
  transition: border-color .16s ease, box-shadow .16s ease;
}
.mark-input:focus { border-color: var(--app-accent); box-shadow: 0 0 0 3px var(--accent-muted); outline: none; }
.mark-input.is-invalid { border-color: var(--danger); box-shadow: 0 0 0 3px var(--accent-muted); }
.mark-input:disabled { cursor: not-allowed; opacity: .5; }
.grade-field-set {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.grade-field { display: grid; min-width: 0; gap: 7px; color: var(--text-secondary); font-size: 12px; font-weight: 600; }
.grade-field .select-trigger { height: 50px; font-weight: 700; }
.empty-state { grid-column: 1 / -1; margin: 0; padding: 25px; border: 1px dashed var(--line); border-radius: 12px; color: var(--muted); text-align: center; font-size: 12px; }
.add-subject {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 47px;
  margin-top: 17px;
  border: 1px dashed var(--line-strong);
  border-radius: 11px;
  color: var(--app-accent);
  background: var(--accent-tint);
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color .16s ease, background .16s ease;
}
.add-subject:hover { border-color: var(--app-accent); background: var(--accent-muted); }
.add-subject > span:first-child { font-size: 19px; font-weight: 400; }

.result-card {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(570px, 100%);
  min-height: 106px;
  margin: 25px auto 0;
  padding: 18px 24px;
  border: 1px solid var(--accent-muted);
  border-radius: 15px;
  background: var(--surface-card);
  box-shadow: var(--shadow-medium);
  backdrop-filter: blur(8px);
}
.result-card > div { display: grid; gap: 6px; }
.result-label { color: var(--muted); font: 500 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.result-gpa { color: var(--app-accent); font: 700 clamp(30px, 5vw, 42px)/1 var(--mono); }
.overall-grade strong { color: var(--text-primary); font: 700 30px var(--mono); }
.result-status { width: min(570px, 100%); min-height: 16px; margin: 9px auto 0; color: var(--muted); text-align: center; font-size: 12px; line-height: 1.5; }

.subject-summary-breakdown {
  width: min(570px, 100%);
  margin: 12px auto 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  font-size: 12px;
  text-align: left;
}
.subject-summary-breakdown div {
  margin-top: 4px;
  color: var(--success);
  font-weight: 600;
}
.subject-summary-breakdown div:first-child {
  margin-top: 0;
}

.subject-dialog {
  width: min(600px, calc(100% - 28px));
  max-height: min(84dvh, 760px);
  overflow: auto;
  padding: 21px;
  border: 1px solid var(--line-strong);
  border-radius: 15px;
  color: var(--text-primary);
  background: var(--surface-elevated);
  box-shadow: var(--shadow-high);
}
.subject-dialog::backdrop { background: color-mix(in srgb, var(--bg-primary) 76%, transparent); backdrop-filter: blur(4px); }
.dialog-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 17px; }
.dialog-header h2 { margin: 0; font-size: 17px; }
.dialog-close { width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 8px; color: var(--text-soft); background: transparent; font-size: 20px; cursor: pointer; }
.search-field { margin-bottom: 12px; }
.catalogue-results { max-height: 34dvh; overflow-y: auto; border-top: 1px solid var(--line); }
.catalogue-item { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 4px; border-bottom: 1px solid var(--line); color: var(--text-soft); font-size: 14px; }
.catalogue-action, .custom-toggle, .custom-save {
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--app-accent);
  background: var(--accent-tint);
  font-size: 10px;
  font-weight: 700;
  cursor: pointer;
}
.catalogue-action:hover, .custom-toggle:hover { border-color: var(--app-accent); background: var(--accent-muted); }
.custom-toggle { margin-top: 14px; }
.custom-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; margin-top: 13px; padding: 15px; border: 1px solid var(--line); border-radius: 11px; background: var(--bg-secondary); }
.custom-form .field-label:first-child, .inline-error, .custom-save { grid-column: 1 / -1; }
.custom-save { min-height: 40px; color: #FFFFFF; background: var(--app-accent); }
.inline-error { margin: 0; color: var(--danger); font-size: 11px; }

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  transition: all var(--transition-fast, .16s ease);
}
.theme-toggle-btn:hover { color: var(--text-primary); border-color: var(--border-medium); }

@media (max-width: 720px) {
  .app-shell { width: min(100% - 32px, 600px); padding-top: 17px; }
  .app-header { margin-bottom: 17px; }
  .setup-card { grid-template-columns: 1fr; gap: 12px; padding: 15px; }
  .field-label input, .field-label .select-trigger { height: 48px; }
  .subject-list { grid-template-columns: 1fr; gap: 14px; }
  .subject-card { padding: 18px; }
  .result-card { bottom: 8px; min-height: 88px; padding: 14px 18px; }
}

@media (max-width: 420px) {
  .app-header { flex-wrap: wrap; gap: 12px; }
  .brand { gap: 9px; font-size: 12px; }
  .brand-mark { width: 36px; height: 36px; border-radius: 11px; }
  .brand-mark svg { width: 27px; height: 27px; }
  .header-actions { gap: 5px; }
  .quiet-button { min-height: 44px; padding: 0 12px; font-size: 12px; }
  .mode-tab { min-height: 46px; padding: 0 10px; font-size: 12px; }
  .subject-card { padding: 16px 14px; }
  .grade-field-set { grid-template-columns: 1fr; gap: 9px; }
  .custom-form { grid-template-columns: 1fr; }
  .custom-form .field-label:first-child, .inline-error, .custom-save { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}

.gpa-intro { margin: 0 0 22px; }
.gpa-intro h1 { max-width: 26ch; margin: 0 0 10px; font-size: clamp(1.65rem, 3.5vw, 2.35rem); line-height: 1.15; }
.gpa-intro p { max-width: 78ch; margin: 0; color: var(--text-secondary); line-height: 1.65; }
.gpa-guide { display: grid; gap: 12px; margin: 42px 0 28px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--text-secondary); line-height: 1.65; }
.gpa-guide h2 { margin: 12px 0 0; color: var(--text-primary); font-size: 19px; line-height: 1.3; }
.gpa-guide ol,
.gpa-grade-scale { padding-left: 1.4rem; list-style: decimal; }
.gpa-guide ol { display: grid; gap: 7px; }
.gpa-grade-scale { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 4px 18px; list-style: disc; }
.gpa-guide a { color: var(--app-accent); text-decoration: underline; text-underline-offset: .18em; }