:root {
  color-scheme: light;
  --ink: #151715;
  --muted: #626860;
  --line: #d9ded5;
  --paper: #f8f7f2;
  --panel: #ffffff;
  --green: #146b4b;
  --green-dark: #0d4f38;
  --gold: #b98124;
  --rose: #a8473f;
  --shadow: 0 18px 60px rgba(32, 34, 30, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 28px;
  border-bottom: 1px solid rgba(21, 23, 21, 0.1);
  background: rgba(248, 247, 242, 0.94);
  backdrop-filter: blur(12px);
}

.brand,
nav {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand {
  text-decoration: none;
  font-weight: 760;
  letter-spacing: 0;
}

.brand-mark {
  width: 26px;
  height: 26px;
  border: 2px solid var(--green);
  border-radius: 50%;
  background:
    linear-gradient(90deg, transparent 42%, var(--green) 42% 50%, transparent 50%),
    linear-gradient(0deg, transparent 44%, var(--gold) 44% 52%, transparent 52%);
}

nav a {
  color: var(--muted);
  font-size: 0.94rem;
  text-decoration: none;
}

nav a:hover {
  color: var(--ink);
}

.hero-band {
  padding: 30px 24px 12px;
}

.hero-copy {
  max-width: 1180px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 0.76rem;
  font-weight: 780;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
  line-height: 1.06;
}

h1 {
  max-width: 920px;
  font-size: clamp(2.1rem, 4.8vw, 4rem);
}

h2 {
  font-size: 1.34rem;
}

.summary {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.workbench {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(380px, 1.18fr) minmax(300px, 0.82fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px 46px;
}

.setup-panel,
.tuning-panel,
.answer-panel,
.policy {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.setup-panel {
  align-self: start;
  overflow: hidden;
}

.tuning-panel {
  align-self: start;
}

.panel-section {
  display: grid;
  gap: 16px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

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

.section-head {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.panel-step-head {
  flex: 1;
  align-items: center;
  min-width: 0;
}

.section-head p,
.panel-title-row p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.step,
.string-number {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  color: #fff;
  background: var(--green);
  font-weight: 780;
  font-variant-numeric: tabular-nums;
}

.optional-text {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 680;
}

.scale-options,
.target-options,
.material-options,
.line-options {
  display: grid;
  gap: 8px;
}

.scale-options {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.target-options {
  grid-template-columns: 1fr;
}

.material-options {
  grid-template-columns: 1fr;
}

.line-options {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

button {
  min-height: 42px;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 760;
}

.chip,
.target-button,
.line-button,
.material,
.stepper-button,
.play-string {
  border: 1px solid #cbd3c6;
  color: var(--ink);
  background: #fff;
}

.chip:hover,
.target-button:hover,
.line-button:hover,
.material:hover,
.stepper-button:hover,
.play-string:hover {
  background: #f0f4ed;
}

.chip.is-active,
.target-button.is-active,
.line-button.is-active,
.material.is-active {
  border-color: var(--green);
  color: #fff;
  background: var(--green);
}

.line-button:disabled {
  cursor: default;
  opacity: 0.45;
}

.material {
  display: grid;
  gap: 2px;
  align-content: center;
  min-height: 58px;
  padding: 8px 10px;
  text-align: left;
}

.material small {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
}

.material.is-active small {
  color: rgba(255, 255, 255, 0.82);
}

.material-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.line-row {
  display: grid;
  gap: 8px;
}

.line-row > span,
.target-custom span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.line-note {
  margin: -6px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.target-custom {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
}

.field {
  display: grid;
  gap: 8px;
}

.field span,
.paste-line span,
.string-control-row label span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.compact {
  grid-template-columns: 72px minmax(0, 1fr);
  align-items: center;
}

input,
select {
  width: 100%;
  min-height: 42px;
  border: 1px solid #cbd3c6;
  border-radius: 6px;
  padding: 0 12px;
  color: var(--ink);
  background: #fff;
}

input[aria-invalid="true"] {
  border-color: var(--rose);
  box-shadow: 0 0 0 1px rgba(168, 71, 63, 0.16);
}

input:focus,
select:focus,
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(20, 107, 75, 0.28);
  outline-offset: 2px;
}

.measure-help,
.nerd-note {
  color: var(--muted);
  font-size: 0.88rem;
}

.measure-help summary,
.nerd-note summary {
  cursor: pointer;
  color: var(--green-dark);
  font-weight: 720;
}

.measure-card {
  display: grid;
  gap: 10px;
  margin-top: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfbf8;
}

.measure-card p {
  margin: 0;
}

.measure-diagram {
  display: grid;
  grid-template-columns: auto minmax(40px, 1fr) auto minmax(40px, 1fr) auto;
  gap: 8px;
  align-items: center;
  color: var(--ink);
  font-size: 0.76rem;
  font-weight: 760;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.measure-diagram i {
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--green));
}

.nerd-note p {
  margin: 8px 0 0;
}

.stepper {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 42px;
  gap: 8px;
  align-items: center;
}

.stepper output {
  display: grid;
  place-items: center;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-weight: 760;
}

.tuning-panel,
.answer-panel {
  overflow: hidden;
}

.panel-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.panel-actions {
  display: flex;
  flex-shrink: 0;
  gap: 8px;
}

.secondary {
  padding: 0 15px;
  color: var(--green-dark);
  background: #e8eee7;
}

.secondary:hover {
  background: #dce8dd;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 42px;
  min-height: 42px;
  color: #fff;
  background: var(--rose);
}

.paste-line {
  display: grid;
  grid-template-columns: 98px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 16px 18px 8px;
}

.preset-row,
.shift-row {
  display: grid;
  grid-template-columns: 98px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 0 18px 10px;
}

.preset-row > span,
.shift-row > span {
  padding-top: 8px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.preset-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset,
.shift-button,
.shift-reset {
  min-height: 34px;
  padding: 0 11px;
  border: 1px solid #cbd3c6;
  border-radius: 999px;
  color: var(--green-dark);
  background: #fff;
  font-size: 0.88rem;
}

.preset:hover,
.shift-button:hover,
.shift-reset:hover {
  background: #f0f4ed;
}

.preset.is-active {
  border-color: var(--green);
  color: #fff;
  background: var(--green);
}

.shift-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.shift-button,
.shift-reset {
  white-space: nowrap;
}

.shift-button {
  flex: 1 1 72px;
}

.shift-reset {
  flex: 0 0 auto;
}

.shift-controls output {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--green-dark);
  background: #f5f7f1;
  font-size: 0.86rem;
  font-weight: 760;
  white-space: nowrap;
}

.shift-reset:disabled {
  cursor: default;
  opacity: 0.45;
}

.notation-help {
  margin: 0;
  padding: 0 18px 16px 128px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.86rem;
}

.notation-help.is-error {
  color: var(--rose);
  font-weight: 680;
}

.orientation-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 18px 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.orientation-label span:first-child {
  color: var(--green-dark);
}

.floor-label {
  padding: 0 18px 8px;
}

.string-editor {
  display: grid;
  gap: 10px;
  padding: 10px 18px;
}

.string-control-row {
  display: grid;
  grid-template-columns: 34px minmax(96px, 1fr) minmax(86px, 0.75fr) 72px;
  gap: 10px;
  align-items: end;
  min-height: 58px;
}

.string-control-row label {
  display: grid;
  gap: 6px;
}

.play-string {
  min-height: 42px;
  color: var(--green-dark);
}

.answer-panel {
  align-self: start;
}

.results-section {
  display: grid;
}

.total-tension {
  margin: 0;
  color: var(--gold);
  font-size: 1.05rem;
  font-weight: 780;
  white-space: nowrap;
}

.gauge-stack {
  display: grid;
  gap: 10px;
  padding: 18px;
}

.shopping-panel {
  display: grid;
  gap: 12px;
  margin: 0 18px 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f5f7f1;
}

.recommendation-toolbar {
  display: grid;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: #fbfbf8;
}

.recommendation-summary {
  display: grid;
  gap: 4px;
}

.recommendation-summary strong {
  font-size: 1rem;
}

.recommendation-summary span {
  color: var(--muted);
  font-size: 0.88rem;
}

.recommendation-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.recommendation-actions .secondary {
  min-height: 36px;
}

.shopping-summary {
  display: grid;
  gap: 5px;
}

.shopping-summary .eyebrow {
  margin-bottom: 0;
}

.shopping-summary strong {
  font-size: 1.12rem;
  font-variant-numeric: tabular-nums;
}

.shopping-summary span,
.shopping-note,
.shopping-actions span {
  color: var(--muted);
  font-size: 0.86rem;
}

.shopping-summary span {
  overflow-wrap: anywhere;
}

.shopping-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.shopping-actions .secondary {
  min-height: 36px;
}

.shopping-actions span {
  color: var(--green-dark);
  font-weight: 720;
}

.shopping-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.shopping-links a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid #cbd3c6;
  border-radius: 999px;
  color: var(--green-dark);
  background: #fff;
  font-size: 0.86rem;
  font-weight: 760;
  text-decoration: none;
}

.shopping-links a:hover {
  background: #f0f4ed;
}

.shopping-note {
  margin: 0;
}

.gauge-card {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfbf8;
}

.gauge-card.status-low,
.gauge-card.status-very-low {
  border-color: rgba(184, 129, 36, 0.52);
}

.gauge-card.status-high,
.gauge-card.status-very-high {
  border-color: rgba(168, 71, 63, 0.42);
}

.gauge-main,
.gauge-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.gauge-main {
  display: grid;
  grid-template-columns: 30px minmax(48px, 1fr) 108px;
}

.gauge-main strong {
  font-size: 1.15rem;
}

.gauge-picker {
  display: grid;
  gap: 4px;
}

.gauge-picker span {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 760;
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: uppercase;
}

.gauge-select {
  appearance: none;
  -webkit-appearance: none;
  min-height: 36px;
  padding: 0 30px 0 10px;
  color: var(--green-dark);
  background:
    linear-gradient(45deg, transparent 50%, var(--green-dark) 50%) calc(100% - 15px) 50% / 6px 6px no-repeat,
    linear-gradient(135deg, var(--green-dark) 50%, transparent 50%) calc(100% - 10px) 50% / 6px 6px no-repeat,
    #fff;
  font-size: 1rem;
  font-weight: 780;
  font-variant-numeric: tabular-nums;
}

.meter {
  position: relative;
  height: 9px;
  border-radius: 999px;
  background: #e6e2d8;
  overflow: hidden;
}

.meter span {
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--green);
}

.status-low .meter span,
.status-very-low .meter span {
  background: var(--gold);
}

.status-high .meter span,
.status-very-high .meter span {
  background: var(--rose);
}

.gauge-meta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  color: var(--muted);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}

.gauge-note {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 0.78rem;
}

.gauge-note span:last-child {
  text-align: right;
}

.gauge-meta span:first-child {
  white-space: nowrap;
}

.gauge-meta span:last-child {
  text-align: right;
}

.answer-note {
  display: grid;
  gap: 4px;
  padding: 16px 18px 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.answer-note strong {
  color: var(--ink);
}

.content-band {
  border-top: 1px solid var(--line);
  background: #eef1ea;
  padding: 44px 24px;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
  max-width: 1180px;
  margin: 0 auto;
}

article h2 {
  margin-bottom: 12px;
  font-size: 1.28rem;
}

article p,
.policy p {
  color: var(--muted);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  justify-content: center;
  padding: 24px;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0;
}

.policy-page {
  padding: 52px 24px;
}

.policy {
  max-width: 780px;
  margin: 0 auto;
  padding: 34px;
}

.policy h1 {
  margin-bottom: 28px;
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.policy h2 {
  margin-top: 26px;
  font-size: 1.22rem;
}

@media (max-width: 1040px) {
  .workbench {
    grid-template-columns: minmax(280px, 0.75fr) minmax(0, 1.25fr);
  }

  .answer-panel {
    grid-column: 1 / -1;
  }

  .gauge-stack {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 761px) {
  .answer-panel .material-options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .answer-panel .target-options {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .site-header {
    padding: 0 16px;
  }

  .workbench,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .workbench {
    padding-left: 14px;
    padding-right: 14px;
  }

  .hero-band,
  .content-band,
  .policy-page {
    padding-left: 14px;
    padding-right: 14px;
  }

  .gauge-stack {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    min-height: 86px;
  }

  h1 {
    font-size: 2.15rem;
  }

  .panel-title-row,
  .paste-line {
    align-items: stretch;
    flex-direction: column;
  }

  .paste-line {
    grid-template-columns: 1fr;
  }

  .preset-row,
  .shift-row {
    grid-template-columns: 1fr;
  }

  .preset-row > span,
  .shift-row > span {
    padding-top: 0;
  }

  .shift-controls {
    display: flex;
  }

  .shift-controls output {
    flex-basis: 100%;
    order: -1;
  }

  .notation-help {
    padding-left: 18px;
  }

  .string-control-row {
    grid-template-columns: 34px minmax(0, 1fr) minmax(78px, 0.72fr);
  }

  .play-string {
    grid-column: 2 / -1;
  }

  .target-custom {
    grid-template-columns: 1fr;
  }

  .recommendation-actions .secondary {
    width: 100%;
  }
}