:root {
  color-scheme: light;
  --canvas: #f4f6f8;
  --surface: #ffffff;
  --surface-muted: #eef2f6;
  --surface-accent: #edf3ff;
  --ink: #172033;
  --ink-muted: #5a6577;
  --line: #d7dde6;
  --line-strong: #bac4d1;
  --accent: #1d4ed8;
  --accent-hover: #173fae;
  --accent-soft: #dce8ff;
  --danger: #a62f2f;
  --danger-hover: #862525;
  --focus: #2563eb;
  --shadow: 0 18px 48px rgba(28, 49, 82, 0.09);
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: rgba(29, 78, 216, 0.16);
}

button,
input,
select {
  font: inherit;
}

button,
a,
input,
select {
  touch-action: manipulation;
}

button {
  color: inherit;
}

a {
  color: inherit;
}

[hidden] {
  display: none !important;
}

.shell {
  width: min(calc(100% - 3rem), 72rem);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 20;
  padding: 0.65rem 0.9rem;
  transform: translateY(-200%);
  border-radius: 0.375rem;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

#planner,
#calculators,
#method,
#privacy {
  scroll-margin-top: 5.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
  background: color-mix(in srgb, var(--canvas) 94%, transparent);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 4.25rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 2rem;
}

.brand {
  width: max-content;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.7rem;
  color: var(--ink-muted);
  font-size: 0.875rem;
}

.desktop-nav a,
.site-footer nav a,
.text-link {
  text-decoration-thickness: 1px;
  text-underline-offset: 0.28em;
  transition: color 160ms ease, text-decoration-color 160ms ease;
}

.desktop-nav a {
  text-decoration: none;
}

.desktop-nav a:hover,
.desktop-nav a.is-current,
.site-footer nav a:hover,
.text-link:hover {
  color: var(--accent);
}

.desktop-nav a.is-current {
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

.header-action {
  justify-self: end;
  min-height: 2.5rem;
  display: inline-flex;
  align-items: center;
  padding: 0 0.95rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.375rem;
  background: var(--surface);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease, transform 100ms ease;
}

.header-action:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.header-action:active,
.button:active,
.compare-button:active,
.add-course:active,
.quiet-button:active {
  transform: translateY(1px);
}

.hero {
  min-height: 25rem;
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(16rem, 0.72fr);
  align-items: end;
  gap: clamp(3rem, 8vw, 8rem);
  padding-block: clamp(4.5rem, 9vw, 7.5rem) 4.5rem;
}

.hero-copy {
  max-width: 45rem;
}

.context-label {
  margin: 0 0 0.85rem;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.015em;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

h1 {
  max-width: 15ch;
  margin: 0;
  font-size: clamp(2.75rem, 6vw, 4.6rem);
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 0.99;
}

.hero-copy > p:not(.context-label) {
  max-width: 39rem;
  margin: 1.45rem 0 0;
  color: var(--ink-muted);
  font-size: clamp(1rem, 2vw, 1.16rem);
  line-height: 1.65;
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 2rem;
}

.button {
  min-height: 2.875rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 1.1rem;
  border: 1px solid transparent;
  border-radius: 0.375rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, transform 100ms ease;
}

.button-primary {
  background: var(--accent);
  color: #ffffff;
}

.button-primary:hover {
  background: var(--accent-hover);
}

.button-secondary {
  border-color: var(--line-strong);
  background: var(--surface);
}

.button-secondary:hover {
  border-color: var(--ink-muted);
}

.button-danger {
  background: var(--danger);
  color: #ffffff;
}

.button-danger:hover {
  background: var(--danger-hover);
}

.text-link {
  color: var(--ink-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.hero-note {
  max-width: 22rem;
  padding: 0.2rem 0 0.15rem 1.25rem;
  border-left: 3px solid var(--accent);
}

.hero-note strong {
  font-size: 0.875rem;
}

.hero-note p {
  margin: 0.5rem 0 0;
  color: var(--ink-muted);
  font-size: 0.875rem;
  line-height: 1.6;
  text-wrap: pretty;
}

.planner-section {
  padding-block: 4.4rem 7.5rem;
}

.section-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.55fr);
  align-items: end;
  gap: 4rem;
  margin-bottom: 1.7rem;
}

.section-intro h2,
.method-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.section-intro > p,
.method-heading > p:last-child {
  max-width: 34rem;
  margin: 0;
  color: var(--ink-muted);
  line-height: 1.65;
  text-wrap: pretty;
}

.planner-frame {
  overflow: clip;
  border: 1px solid var(--line-strong);
  border-radius: 0.625rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.planner-toolbar {
  min-height: 4.6rem;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 1.5rem;
  padding-inline: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.scenario-tabs {
  display: flex;
  align-items: stretch;
  gap: 0.3rem;
}

.scenario-tab {
  min-width: 8.25rem;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, background-color 160ms ease;
}

.scenario-tab span,
.scenario-tab small {
  display: block;
  text-align: left;
}

.scenario-tab span {
  font-size: 0.9rem;
  font-weight: 600;
}

.scenario-tab small {
  margin-top: 0.12rem;
  color: var(--ink-muted);
  font-size: 0.72rem;
}

.scenario-tab:hover:not(:disabled) {
  background: var(--surface-muted);
}

.scenario-tab.is-active {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.scenario-tab:disabled {
  color: var(--ink-muted);
  cursor: not-allowed;
  opacity: 0.48;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.save-state {
  color: var(--ink-muted);
  font-size: 0.75rem;
}

.save-state::before {
  content: "";
  width: 0.42rem;
  height: 0.42rem;
  display: inline-block;
  margin-right: 0.45rem;
  border-radius: 50%;
  background: #2f7d4b;
  vertical-align: 0.08rem;
}

.quiet-button,
.add-course {
  min-height: 2.75rem;
  border: 0;
  background: transparent;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, transform 100ms ease;
}

.quiet-button {
  padding-inline: 0.7rem;
  color: var(--ink-muted);
  font-size: 0.8rem;
}

.quiet-button:hover {
  background: var(--surface-muted);
  color: var(--ink);
}

.planner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.58fr) minmax(19rem, 0.72fr);
}

.course-editor {
  min-width: 0;
  padding: 1.65rem;
}

.table-head,
.course-row {
  display: grid;
  grid-template-columns: minmax(8rem, 1.6fr) minmax(4.6rem, 0.6fr) minmax(6.8rem, 0.9fr) minmax(4.8rem, 0.55fr) 2.75rem;
  gap: 0.65rem;
  align-items: start;
}

.table-head {
  padding: 0 0.1rem 0.55rem;
  color: var(--ink-muted);
  font-size: 0.72rem;
  font-weight: 600;
}

.course-row {
  margin-bottom: 0.7rem;
}

.course-field {
  min-width: 0;
}

.course-field label {
  display: none;
}

.course-field input,
.course-field select {
  width: 100%;
  height: 2.875rem;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 0.375rem;
  background-color: var(--surface);
  color: var(--ink);
  padding: 0 0.75rem;
  transition: border-color 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.course-field input::placeholder {
  color: color-mix(in srgb, var(--ink-muted) 72%, transparent);
}

.course-field input:hover,
.course-field select:hover {
  border-color: var(--line-strong);
}

.course-field input:focus-visible,
.course-field select:focus-visible {
  border-color: var(--focus);
  outline: 0;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 20%, transparent);
}

.course-field input[aria-invalid="true"] {
  border-color: var(--danger);
}

.field-error {
  margin: 0.35rem 0 0;
  color: var(--danger);
  font-size: 0.72rem;
  line-height: 1.35;
}

.remove-course {
  width: 2.75rem;
  height: 2.75rem;
  border: 0;
  border-radius: 0.375rem;
  background: transparent;
  color: var(--ink-muted);
  font-size: 1.25rem;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, transform 100ms ease;
}

.remove-course:hover {
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  color: var(--danger);
}

.remove-course:active {
  transform: translateY(1px);
}

.editor-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-top: 0.55rem;
}

.add-course {
  position: relative;
  padding: 0 0 0 1.9rem;
  color: var(--accent);
}

.add-course::before {
  content: "+";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1.45rem;
  height: 1.45rem;
  display: grid;
  place-items: center;
  transform: translateY(-50%);
  border: 1px solid var(--accent);
  border-radius: 0.25rem;
  font-size: 1rem;
  line-height: 1;
}

.add-course:hover {
  color: var(--accent-hover);
}

.editor-footer p {
  max-width: 26rem;
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.72rem;
  text-align: right;
}

.result-panel {
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 2rem;
  border-left: 1px solid var(--line);
  background: var(--surface-accent);
}

.result-label {
  margin: 0 0 0.75rem;
  color: var(--ink-muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.primary-result {
  display: flex;
  align-items: end;
  gap: 0.9rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid color-mix(in srgb, var(--line-strong) 78%, transparent);
}

.primary-result strong {
  color: var(--accent);
  font-family: var(--mono);
  font-size: clamp(3.6rem, 7vw, 5rem);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.075em;
  line-height: 0.86;
}

.primary-result span {
  padding-bottom: 0.35rem;
  color: var(--ink-muted);
  font-size: 0.75rem;
}

.secondary-result {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.25rem 0;
}

.secondary-result div,
.comparison dl div {
  min-width: 0;
}

.secondary-result dt,
.comparison dt {
  color: var(--ink-muted);
  font-size: 0.72rem;
}

.secondary-result dd,
.comparison dd {
  margin: 0.25rem 0 0;
  font-family: var(--mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.secondary-result dd {
  font-size: 1.15rem;
}

.formula-box,
.comparison {
  padding: 0.9rem;
  border: 1px solid color-mix(in srgb, var(--line-strong) 72%, transparent);
  border-radius: 0.375rem;
  background: color-mix(in srgb, var(--surface) 66%, transparent);
}

.formula-box > span,
.comparison > span {
  color: var(--ink-muted);
  font-size: 0.7rem;
  font-weight: 600;
}

.formula-box p {
  margin: 0.4rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.55;
}

.comparison {
  margin-top: 0.75rem;
}

.comparison dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 0.7rem 0 0;
}

.comparison p {
  margin: 0.7rem 0 0;
  color: var(--accent);
  font-size: 0.76rem;
  line-height: 1.45;
}

.compare-button {
  min-height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: auto;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--accent);
  border-radius: 0.375rem;
  background: transparent;
  color: var(--accent);
  text-align: left;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, transform 100ms ease;
}

.compare-button:hover {
  background: var(--accent);
  color: #ffffff;
}

.compare-button span:first-child,
.compare-button strong,
.compare-button small {
  display: block;
}

.compare-button strong {
  font-size: 0.82rem;
}

.compare-button small {
  margin-top: 0.12rem;
  color: currentColor;
  font-size: 0.7rem;
  opacity: 0.75;
}

.policy-note {
  margin: 1rem 0 0;
  color: var(--ink-muted);
  font-size: 0.76rem;
  text-align: center;
}

.undo-bar {
  min-height: 3.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 1rem;
  border-top: 1px solid var(--line);
  background: var(--ink);
  color: var(--surface);
  font-size: 0.82rem;
}

.undo-bar button {
  min-width: 3.5rem;
  min-height: 2rem;
  border: 0;
  background: transparent;
  color: var(--surface);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.25em;
  cursor: pointer;
}

.calculator-section {
  padding-block: 2rem 7.5rem;
}

.section-intro.compact {
  margin-bottom: 2.2rem;
}

.tool-list {
  border-top: 1px solid var(--line-strong);
}

.tool-row {
  min-height: 5.1rem;
  display: grid;
  grid-template-columns: minmax(12rem, 1fr) minmax(15rem, 1.2fr) 7.5rem 2rem;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-muted);
}

a.tool-row {
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease, padding-inline 160ms ease;
}

a.tool-row:hover {
  padding-inline: 0.75rem;
  background: var(--surface);
  color: var(--accent);
}

.tool-name {
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 600;
}

.tool-description {
  font-size: 0.86rem;
}

.tool-status {
  font-size: 0.76rem;
  font-weight: 600;
}

.is-available .tool-status,
.is-available .tool-arrow {
  color: var(--accent);
}

.tool-arrow {
  justify-self: end;
  font-size: 1.2rem;
}

.home-guides {
  padding-block: 1rem 7.5rem;
}

.home-guide-list {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.home-guide-feature {
  min-height: 22rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-content: center;
  gap: 0.8rem 1.5rem;
  padding: 2rem 3rem 2rem 0;
  border-right: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  transition: color 160ms ease, padding-inline 160ms ease, background-color 160ms ease;
}

.home-guide-feature:hover {
  padding-inline: 1.25rem 1.75rem;
  background: var(--surface);
  color: var(--accent);
}

.home-guide-feature strong {
  max-width: 14ch;
  display: block;
  grid-column: 1;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.home-guide-feature > span:not(.home-guide-kicker):not(.home-guide-arrow) {
  max-width: 30rem;
  grid-column: 1;
  color: var(--ink-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.home-guide-kicker {
  grid-column: 1;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
}

.home-guide-arrow {
  grid-column: 2;
  grid-row: 2;
  color: var(--accent);
  font-size: 1.3rem;
}

.home-guide-secondary {
  padding-left: 3rem;
}

.home-guide-secondary > a {
  min-height: 5.15rem;
  display: grid;
  grid-template-columns: minmax(12rem, 0.8fr) minmax(0, 1.2fr);
  align-items: center;
  gap: 1.5rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  transition: color 160ms ease, padding-inline 160ms ease, background-color 160ms ease;
}

.home-guide-secondary > a:hover {
  padding-inline: 0.75rem;
  background: var(--surface);
  color: var(--accent);
}

.home-guide-secondary strong {
  font-size: 0.96rem;
}

.home-guide-secondary a > span {
  color: var(--ink-muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

.home-guide-secondary > .all-guides-link {
  min-height: 4.5rem;
  display: flex;
  justify-content: space-between;
  border-bottom: 0;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.82rem;
}

.method-section {
  display: grid;
  grid-template-columns: minmax(16rem, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(3rem, 9vw, 8rem);
  padding-block: 7rem 8rem;
  border-top: 1px solid var(--line-strong);
}

.method-heading {
  align-self: start;
}

.method-heading > p:last-child {
  margin-top: 1.2rem;
}

.method-points {
  border-top: 1px solid var(--line-strong);
}

.method-points article {
  display: grid;
  grid-template-columns: minmax(9rem, 0.58fr) minmax(0, 1fr);
  gap: 2rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}

.method-points h3,
.method-points p {
  margin: 0;
}

.method-points h3 {
  font-size: 0.98rem;
}

.method-points p {
  color: var(--ink-muted);
  font-size: 0.88rem;
  line-height: 1.65;
  text-wrap: pretty;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-inner {
  min-height: 10rem;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 3rem;
}

.footer-brand {
  display: inline-block;
}

.footer-inner p {
  margin: 0.35rem 0 0;
  color: var(--ink-muted);
  font-size: 0.76rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.4rem;
  row-gap: 0.55rem;
  color: var(--ink-muted);
  font-size: 0.8rem;
}

.reset-dialog {
  width: min(calc(100% - 2rem), 27rem);
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 0.625rem;
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 24px 80px rgba(15, 29, 54, 0.22);
}

.reset-dialog::backdrop {
  background: rgba(15, 23, 34, 0.55);
  backdrop-filter: blur(2px);
}

.reset-dialog form {
  padding: 1.5rem;
}

.reset-dialog h2 {
  margin: 0;
  font-size: 1.35rem;
}

.reset-dialog p {
  margin: 0.7rem 0 0;
  color: var(--ink-muted);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

@media (max-width: 56rem) {
  .desktop-nav {
    display: none;
  }

  .header-inner {
    grid-template-columns: 1fr auto;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-note {
    max-width: 40rem;
  }

  .planner-grid {
    grid-template-columns: 1fr;
  }

  .result-panel {
    min-height: 25rem;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .home-guide-list {
    grid-template-columns: 1fr;
  }

  .home-guide-feature {
    min-height: 17rem;
    padding-right: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .home-guide-secondary {
    padding-left: 0;
  }

  .method-section {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 42.5rem) {
  .shell {
    width: min(calc(100% - 1.5rem), 72rem);
  }

  .site-header,
  .header-inner {
    min-height: 4rem;
  }

  .brand {
    font-size: 1rem;
  }

  .header-action {
    min-height: 2.5rem;
    padding-inline: 0.75rem;
    font-size: 0.8rem;
  }

  .hero {
    min-height: 0;
    padding-block: 3.8rem 3.4rem;
  }

  h1 {
    font-size: clamp(2.55rem, 12vw, 3.5rem);
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 1rem;
  }

  .planner-section,
  .calculator-section,
  .home-guides {
    padding-block: 3.5rem 5.2rem;
  }

  .section-intro {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .section-intro h2,
  .method-heading h2 {
    font-size: 2.2rem;
  }

  .planner-toolbar {
    min-height: 0;
    display: block;
    padding-inline: 0.8rem;
  }

  .scenario-tabs {
    height: 4.2rem;
  }

  .scenario-tab {
    flex: 1;
    min-width: 0;
    padding-inline: 0.6rem;
  }

  .toolbar-actions {
    min-height: 3.4rem;
    justify-content: space-between;
    border-top: 1px solid var(--line);
  }

  .course-editor {
    padding: 1rem 0.8rem 1.25rem;
  }

  .table-head {
    display: none;
  }

  .course-row {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0.55rem;
    padding: 0.8rem 0 1rem;
    margin: 0;
    border-bottom: 1px solid var(--line);
  }

  .course-field label {
    display: block;
    margin-bottom: 0.32rem;
    color: var(--ink-muted);
    font-size: 0.68rem;
    font-weight: 600;
  }

  .course-name-field {
    grid-column: 1 / 6;
    grid-row: 1;
  }

  .grade-field {
    grid-column: 1 / 3;
    grid-row: 2;
  }

  .level-field {
    grid-column: 3 / 5;
    grid-row: 2;
  }

  .credit-field {
    grid-column: 5 / 7;
    grid-row: 2;
  }

  .remove-course {
    grid-column: 6;
    grid-row: 1;
    align-self: end;
  }

  .course-field input,
  .course-field select {
    height: 2.75rem;
    padding-inline: 0.55rem;
    font-size: 0.88rem;
  }

  .editor-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.7rem;
    padding-top: 1rem;
  }

  .editor-footer p {
    text-align: left;
  }

  .result-panel {
    min-height: 26rem;
    padding: 1.5rem 1.25rem;
  }

  .tool-row {
    grid-template-columns: 1fr auto;
    gap: 0.35rem 1rem;
    padding-block: 1rem;
  }

  .tool-name,
  .tool-description {
    grid-column: 1;
  }

  .tool-status,
  .tool-arrow {
    grid-column: 2;
  }

  .tool-status {
    grid-row: 1;
  }

  .home-guide-secondary > a {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 0.35rem;
    padding-block: 1.1rem;
  }

  .home-guide-feature:hover,
  .home-guide-secondary > a:hover {
    padding-inline: 0.65rem;
  }

  .tool-arrow {
    grid-row: 2;
  }

  .method-section {
    padding-block: 5rem 5.8rem;
  }

  .method-points article {
    grid-template-columns: 1fr;
    gap: 0.55rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.2rem;
    padding-block: 2.5rem;
  }

  .site-footer nav {
    flex-wrap: wrap;
  }

  .dialog-actions {
    align-items: stretch;
    flex-direction: column-reverse;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --canvas: #101722;
    --surface: #161f2d;
    --surface-muted: #1d2838;
    --surface-accent: #172844;
    --ink: #edf2f8;
    --ink-muted: #a6b1c1;
    --line: #2c394b;
    --line-strong: #435169;
    --accent: #7aa2ff;
    --accent-hover: #9bb9ff;
    --accent-soft: #1e3767;
    --danger: #ec7777;
    --danger-hover: #f29191;
    --focus: #9bb9ff;
    --shadow: 0 18px 48px rgba(0, 0, 0, 0.25);
  }

  .button-primary {
    background: #6f96ee;
    color: #0f1724;
  }

  .button-primary:hover {
    background: #8aabf5;
  }

  .button-danger {
    background: #bd5151;
    color: #ffffff;
  }

  .save-state::before {
    background: #78c897;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}