:root {
  color-scheme: light;
  --ink: #16201d;
  --ink-soft: #52605b;
  --paper: #f7f6f1;
  --surface: #ffffff;
  --surface-muted: #eeeee7;
  --line: #d9dcd4;
  --accent: #0d7458;
  --accent-dark: #075843;
  --focus: #e76735;
  --radius: 18px;
  --shadow: 0 18px 45px rgb(25 45 38 / 9%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

a {
  color: inherit;
}

a:focus-visible {
  border-radius: 4px;
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.12;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(2.6rem, 8vw, 5.6rem);
  font-weight: 750;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h3 {
  margin-bottom: 12px;
  font-size: 1.35rem;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  transform: translateY(-150%);
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
}

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

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgb(247 246 241 / 92%);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 9px;
  background: var(--ink);
  color: #fff;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

nav a,
.site-footer a {
  color: var(--ink-soft);
  font-size: 0.94rem;
  font-weight: 650;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.header-inner nav,
.footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.hero {
  padding: clamp(72px, 10vw, 132px) 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 88% 8%, rgb(13 116 88 / 12%), transparent 30%),
    var(--paper);
}

.hero-grid {
  display: grid;
  align-items: end;
  gap: 64px;
}

.eyebrow,
.card-kicker,
.status {
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: 18px;
}

.hero-copy {
  max-width: 650px;
  margin-bottom: 32px;
  color: var(--ink-soft);
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

.button-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 10px;
  font-weight: 750;
  text-decoration: none;
}

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

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

.text-link {
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

.principle-card {
  max-width: 440px;
  padding: clamp(26px, 5vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card-kicker {
  margin-bottom: 22px;
}

.check-list {
  display: grid;
  margin: 0 0 24px;
  padding: 0;
  gap: 14px;
  list-style: none;
}

.check-list li {
  display: flex;
  gap: 10px;
}

.check-list li::before {
  color: var(--accent);
  content: "✓";
  font-weight: 900;
}

.privacy-note {
  margin-bottom: 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.section {
  padding: clamp(70px, 9vw, 112px) 0;
}

.section-muted {
  border-block: 1px solid var(--line);
  background: var(--surface-muted);
}

.section-heading {
  display: grid;
  gap: 24px;
  margin-bottom: 44px;
}

.section-heading > p {
  max-width: 450px;
  margin-bottom: 0;
  color: var(--ink-soft);
}

.feature-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: clamp(24px, 5vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.available-grid {
  display: grid;
  gap: 18px;
}

.tool-number {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 850;
}

.feature-content {
  display: grid;
  gap: 7px;
}

.feature-content strong {
  font-size: clamp(1.3rem, 3vw, 2rem);
  line-height: 1.2;
}

.feature-content > span {
  color: var(--ink-soft);
}

.feature-arrow {
  color: var(--accent);
  font-size: 2rem;
}

.planned-grid {
  display: grid;
  gap: 16px;
}

.planned-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgb(255 255 255 / 52%);
}

.planned-card .status {
  display: inline-block;
  margin-bottom: 34px;
}

.planned-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.site-footer {
  padding: 36px 0;
  background: var(--ink);
  color: #fff;
}

.site-footer p {
  margin-bottom: 0;
}

.site-footer span,
.site-footer a {
  color: #bdc9c5;
}

.tool-hero {
  padding: clamp(62px, 8vw, 104px) 0 48px;
}

.breadcrumb {
  margin-bottom: 32px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  gap: 8px;
  list-style: none;
}

.breadcrumb li + li::before {
  margin-right: 8px;
  color: #8a9691;
  content: "/";
}

.breadcrumb a {
  text-underline-offset: 4px;
}

.tool-hero h1 {
  max-width: 900px;
  font-size: clamp(2.5rem, 7vw, 4.8rem);
}

.tool-intro {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 1.15rem;
}

.tool-stage {
  padding: 0 0 clamp(70px, 9vw, 112px);
}

.calculator-layout {
  display: grid;
  align-items: start;
  gap: 20px;
}

.calculator-form-card,
.result-panel,
.error-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.calculator-form-card {
  padding: clamp(24px, 5vw, 46px);
}

.calculator-heading {
  margin-bottom: 34px;
}

.calculator-heading h2,
.result-panel h2,
.error-panel h2 {
  margin-bottom: 14px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.calculator-heading > p:last-child {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--ink-soft);
}

.mode-switcher,
.input-group {
  margin: 0;
  padding: 0;
  border: 0;
}

.mode-switcher {
  display: grid;
  grid-template-columns: 1fr;
  margin-bottom: 36px;
  padding: 5px;
  gap: 5px;
  border-radius: 12px;
  background: var(--surface-muted);
}

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

.mode-option {
  position: relative;
  cursor: pointer;
}

.mode-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.mode-option span {
  display: flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 9px 12px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 750;
  text-align: center;
}

.mode-option input:checked + span {
  border-color: var(--line);
  background: var(--surface);
  color: var(--accent-dark);
  box-shadow: 0 3px 12px rgb(25 45 38 / 7%);
}

.mode-option input:focus-visible + span {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.mode-panel[hidden],
.custom-ratio[hidden],
.conditional-fields[hidden],
.error-panel[hidden],
.result-note[hidden] {
  display: none;
}

.input-group {
  margin-bottom: 24px;
}

.custom-ratio {
  margin-top: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-muted);
}

.input-group legend {
  margin-bottom: 10px;
  font-weight: 750;
}

.duration-grid,
.timecode-grid,
.field-grid {
  display: grid;
  gap: 16px;
}

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

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

.frame-rate-field {
  max-width: 360px;
  margin-top: 24px;
}

.field-help {
  margin: 12px 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.field {
  min-width: 0;
}

.field label {
  display: block;
  margin-bottom: 7px;
  font-size: 0.9rem;
  font-weight: 700;
}

.optional {
  color: var(--ink-soft);
  font-size: 0.75rem;
  font-weight: 550;
}

.field input,
.field select {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid #b9c0bc;
  border-radius: 9px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

.field input:hover,
.field select:hover {
  border-color: #77847f;
}

.field input:focus-visible,
.field select:focus-visible {
  border-color: var(--accent);
  outline: 3px solid rgb(13 116 88 / 18%);
  outline-offset: 1px;
}

.input-with-unit {
  position: relative;
}

.input-with-unit input {
  padding-right: 72px;
}

.input-with-unit span {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 700;
  pointer-events: none;
}

.form-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 30px;
  gap: 18px;
}

.calculate-button {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.unit-note {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.feedback-column {
  display: grid;
  gap: 20px;
}

.result-panel,
.error-panel {
  padding: clamp(24px, 4vw, 34px);
}

.result-panel {
  border-top: 5px solid var(--accent);
}

.result-placeholder,
.result-note {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.result-list {
  display: grid;
  margin: 26px 0 0;
  padding: 0;
  gap: 0;
}

.result-item {
  display: grid;
  padding: 16px 0;
  gap: 2px;
  border-top: 1px solid var(--line);
}

.result-item dt {
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 700;
}

.result-item dd {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 750;
}

.result-item-primary dd {
  color: var(--accent-dark);
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  letter-spacing: -0.025em;
}

.result-note {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
}

.error-panel {
  border-color: #d6a392;
  background: #fff7f3;
  box-shadow: none;
}

.error-panel .eyebrow {
  color: #a53e1e;
}

.error-panel ul {
  margin: 18px 0 0;
  padding-left: 22px;
  color: #6e2e1b;
}

.error-panel li + li {
  margin-top: 8px;
}

.checker-group {
  margin-bottom: 36px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line);
}

.checker-group:last-of-type {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.checker-group > legend {
  margin-bottom: 18px;
  font-size: 1.3rem;
}

.conditional-fields {
  margin-top: 18px;
}

.overall-status {
  margin-top: 24px;
  padding: 18px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--accent);
  border-radius: 10px;
  background: #f2faf6;
}

.overall-status h3,
.recommendation-summary h3,
.check-row h3 {
  margin-bottom: 6px;
  font-size: 1rem;
  letter-spacing: 0;
}

.overall-status p,
.check-detail {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.overall-review {
  border-left-color: #b77817;
  background: #fffaed;
}

.overall-not-recommended {
  border-left-color: #af482b;
  background: #fff5f1;
}

.recommendation-summary {
  margin-top: 24px;
  padding: 20px;
  border-radius: 10px;
  background: var(--surface-muted);
}

.recommendation-summary dl {
  display: grid;
  margin: 14px 0 0;
  gap: 10px;
}

.recommendation-summary dl div {
  display: grid;
  gap: 2px;
}

.recommendation-summary dt {
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 700;
}

.recommendation-summary dd {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
}

.checks-grid {
  display: grid;
  margin-top: 24px;
  gap: 12px;
}

.check-row {
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 4px solid #83938c;
  border-radius: 10px;
  background: var(--surface);
}

.check-row-recommended {
  border-left-color: var(--accent);
}

.check-row-review {
  border-left-color: #b77817;
}

.check-row-not-recommended {
  border-left-color: #af482b;
}

.check-value {
  margin-bottom: 8px;
  font-weight: 750;
}

.check-status {
  display: inline-flex;
  margin-bottom: 9px;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--ink-soft);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.status-recommended {
  background: #e3f4ec;
  color: #075843;
}

.status-review {
  background: #fff0c9;
  color: #765006;
}

.status-not-recommended {
  background: #fde3da;
  color: #8e321a;
}

.source-note {
  padding: 44px 0;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.source-note h2 {
  margin-bottom: 14px;
  font-size: 1.5rem;
}

.source-note p {
  max-width: 760px;
  color: var(--ink-soft);
}

.source-note p:last-child {
  margin-bottom: 0;
}

.details-grid {
  display: grid;
  gap: 44px;
}

.details-grid h2 {
  margin-bottom: 18px;
  font-size: 1.65rem;
}

.details-grid p {
  color: var(--ink-soft);
}

.formula {
  padding: 20px;
  border-left: 4px solid var(--accent);
  background: var(--surface-muted);
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.92rem;
}

.error-page {
  display: grid;
  min-height: calc(100vh - 76px);
  place-items: center;
  padding: 60px 0;
}

.error-content {
  max-width: 660px;
  text-align: center;
}

.error-code {
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 1rem;
  font-weight: 850;
  letter-spacing: 0.14em;
}

.error-content h1 {
  margin-bottom: 20px;
  font-size: clamp(2.7rem, 8vw, 5rem);
}

.error-content > p:not(.error-code) {
  margin-bottom: 30px;
  color: var(--ink-soft);
  font-size: 1.1rem;
}

@media (min-width: 720px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.75fr);
  }

  .section-heading {
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
    align-items: end;
  }

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

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

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

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

  .timecode-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .available-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .calculator-layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.65fr);
  }

  .feedback-column {
    position: sticky;
    top: 20px;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

  .header-inner {
    min-height: 68px;
    flex-wrap: wrap;
    padding-block: 12px;
    gap: 8px;
  }

  .header-inner nav {
    display: flex;
    width: 100%;
    gap: 2px 16px;
  }

  .header-inner nav a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    font-size: 0.86rem;
  }

  .feature-card {
    grid-template-columns: auto 1fr;
  }

  .feature-arrow {
    display: none;
  }

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

  .form-actions,
  .calculate-button {
    width: 100%;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

  .feature-card {
    transition: none;
  }
}