:root {
  color-scheme: light;
  --orange: #ff7a00;
  --orange-dark: #d95f00;
  --orange-soft: #fff1e6;
  --bg: #ffffff;
  --surface: #f7f7f8;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #5f6b7a;
  --border: #e5e7eb;
  --shadow: 0 18px 45px rgba(31, 41, 55, 0.10);
  --radius: 8px;
  --container: 1120px;
  --focus: 0 0 0 3px rgba(255, 122, 0, 0.28);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101114;
  --surface: #17191d;
  --card: #202329;
  --text: #f3f4f6;
  --muted: #c2c7d0;
  --border: #333844;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.34);
  --orange-soft: rgba(255, 122, 0, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

textarea {
  resize: vertical;
}

img,
svg {
  max-width: 100%;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  background: var(--orange);
  color: #fff;
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 1rem;
}

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

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.section-band {
  background: var(--surface);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
}

.navbar {
  width: min(100% - 2rem, var(--container));
  min-height: 72px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 2.35rem;
  height: 2.35rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--orange);
  color: #fff;
  font-weight: 900;
  box-shadow: 0 10px 24px rgba(255, 122, 0, 0.28);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-actions a,
.theme-toggle {
  min-height: 42px;
  border: 0;
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.nav-actions a:hover,
.theme-toggle:hover {
  background: var(--orange-soft);
  color: var(--orange-dark);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  cursor: pointer;
}

.menu-toggle span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  border-radius: 999px;
  background: var(--text);
}

.hero {
  padding: 5rem 0 3.4rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.7fr);
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--orange-dark);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

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

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.45rem, 4vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h1::after {
  content: "";
  display: block;
  width: 5rem;
  height: 0.38rem;
  margin-top: 1rem;
  border-radius: 999px;
  background: var(--orange);
}

h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.65rem);
  line-height: 1.15;
}

h3 {
  margin: 0 0 0.7rem;
  font-size: 1.12rem;
  line-height: 1.25;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 680px;
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.hero-buttons,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0.78rem 1rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

.button.primary {
  background: var(--orange);
  color: #fff;
  box-shadow: 0 12px 26px rgba(255, 122, 0, 0.25);
}

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

.button.secondary,
.button.ghost {
  background: var(--card);
  border-color: var(--border);
  color: var(--text);
}

.button.ghost:hover,
.button.secondary:hover {
  border-color: var(--orange);
  color: var(--orange-dark);
}

.hero-note {
  font-size: 0.98rem;
}

.hero-panel {
  display: grid;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
}

.mini-card,
.hero-result {
  display: grid;
  gap: 0.35rem;
  min-height: 96px;
  padding: 1rem;
  border-radius: var(--radius);
  background: var(--surface);
}

.mini-card span,
.hero-result span {
  color: var(--muted);
  font-size: 0.92rem;
}

.mini-card strong,
.hero-result strong {
  font-size: 1.8rem;
  line-height: 1;
}

.mini-card.accent,
.hero-result {
  background: var(--orange-soft);
}

.trust-panel .mini-card strong,
.trust-panel .hero-result strong {
  font-size: 1.35rem;
  line-height: 1.18;
}

.quick-start {
  padding: 1.5rem 0 0;
}

.proof-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
  color: var(--orange-dark);
}

.proof-line span {
  letter-spacing: 0;
  font-size: 1.1rem;
}

.proof-line strong {
  color: var(--text);
}

.quick-tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.quick-tool-card {
  min-height: 92px;
  display: grid;
  align-content: center;
  gap: 0.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  padding: 0.9rem;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.quick-tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--orange);
}

.quick-tool-card span {
  width: 2.4rem;
  height: 2.4rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--orange-soft);
  color: var(--orange-dark);
  font-size: 0.9rem;
  font-weight: 900;
}

.quick-tool-card strong {
  line-height: 1.2;
}

.ad-slot {
  display: grid;
  place-items: center;
  min-height: 84px;
  margin-block: 1.5rem;
  border: 1px dashed color-mix(in srgb, var(--orange) 42%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--orange-soft) 55%, var(--card));
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.calculator-section,
.tools-section,
.utility-section,
.faq-section {
  padding: 4.5rem 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 1.6rem;
}

.section-heading p:not(.eyebrow) {
  margin: 0.8rem 0 0;
  color: var(--muted);
}

.inline-heading {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
}

.tool-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 1.25rem;
  align-items: start;
}

.calculator-card,
.side-panel,
.info-panel,
.cookie-note {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
}

.calculator-card {
  padding: 1.25rem;
}

.type-selector {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.type-selector legend {
  margin-bottom: 0.6rem;
  font-weight: 800;
}

.type-selector label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 48px;
  padding: 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
}

.type-selector input {
  accent-color: var(--orange);
}

.proportion-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
  align-items: end;
}

.relation-text {
  grid-column: 1 / -1;
  color: var(--muted);
  font-weight: 700;
  text-align: center;
}

.input-group {
  display: grid;
  gap: 0.45rem;
}

.input-group label {
  font-weight: 800;
}

.input-group input,
.input-group select,
.input-group textarea {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 0.9rem;
  background: var(--bg);
  color: var(--text);
}

.input-group input[readonly] {
  background: var(--orange-soft);
  color: var(--orange-dark);
  font-weight: 900;
}

.form-message {
  min-height: 1.6rem;
  margin: 1rem 0 0;
  color: #b42318;
  font-weight: 700;
}

[data-theme="dark"] .form-message {
  color: #ffb4a8;
}

.result-box {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.3rem;
  padding: 1rem;
  border-radius: var(--radius);
  background: var(--orange-soft);
  border: 1px solid color-mix(in srgb, var(--orange) 35%, transparent);
}

.result-label {
  margin: 0;
  color: var(--muted);
  font-weight: 800;
}

#result-value {
  display: block;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.05;
}

#steps-list {
  margin: 0;
  padding-left: 1.25rem;
}

#result-explanation {
  margin: 0;
}

.side-panel {
  padding: 1rem;
}

.example-list,
.tools-grid,
.history-list,
.faq-list {
  display: grid;
  gap: 0.75rem;
}

.example-button,
.history-item,
.tool-card,
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
}

.example-button {
  width: 100%;
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem;
  text-align: left;
  color: var(--text);
  cursor: pointer;
}

.example-button:hover {
  border-color: var(--orange);
}

.example-button span,
.history-meta,
.tool-card p,
.empty-state {
  color: var(--muted);
}

.history-section {
  padding: 4rem 0;
}

.history-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem;
}

.history-item strong {
  display: block;
}

.history-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.small-button {
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  padding: 0.45rem 0.65rem;
  font-weight: 800;
  cursor: pointer;
}

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

.tool-card {
  display: grid;
  gap: 0.7rem;
  padding: 1rem;
  min-height: 218px;
}

.tool-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--orange-soft);
  color: var(--orange-dark);
  font-weight: 900;
}

.status {
  width: fit-content;
  border-radius: 999px;
  padding: 0.28rem 0.65rem;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.status.available {
  background: var(--orange-soft);
  color: var(--orange-dark);
}

.utility-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.utility-card {
  display: grid;
  align-content: start;
  gap: 0.85rem;
  scroll-margin-top: 90px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  padding: 1.15rem;
  box-shadow: var(--shadow);
}

.utility-card > p {
  margin: 0;
  color: var(--muted);
}

.utility-form {
  display: grid;
  gap: 0.85rem;
}

.input-pair,
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.utility-result {
  min-height: 52px;
  display: grid;
  gap: 0.35rem;
  align-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.85rem;
  color: var(--muted);
}

.utility-result strong {
  color: var(--text);
  font-size: 1.25rem;
  line-height: 1.2;
}

.utility-result.is-error {
  border-color: #f2a29a;
  color: #b42318;
}

[data-theme="dark"] .utility-result.is-error {
  border-color: #8d4038;
  color: #ffb4a8;
}

.time-display {
  min-height: 72px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--orange-soft);
  color: var(--orange-dark);
  font-variant-numeric: tabular-nums;
  font-weight: 900;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
}

.button-row.compact {
  margin-top: 0;
}

.lap-list {
  max-height: 160px;
  overflow: auto;
  margin: 0;
  padding-left: 1.3rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.stats-grid {
  margin-top: 0.85rem;
}

.stat-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.85rem;
}

.stat-item span {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
}

.stat-item strong {
  display: block;
  color: var(--text);
  font-size: 1.35rem;
  line-height: 1.15;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.checkbox-grid legend {
  margin-bottom: 0.25rem;
  font-weight: 800;
}

.checkbox-grid label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.55rem 0.65rem;
}

.checkbox-grid input,
input[type="range"] {
  accent-color: var(--orange);
}

.password-output {
  word-break: break-all;
}

.content-grid,
.legal-grid,
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.65fr);
  gap: 1.25rem;
}

.education-section {
  padding: 4.5rem 0 3rem;
}

.info-panel,
.cookie-note {
  padding: 1.2rem;
}

.check-list {
  display: grid;
  gap: 0.5rem;
  margin: 0 0 1.4rem;
  padding-left: 1.1rem;
}

.faq-item {
  overflow: hidden;
}

.faq-question {
  width: 100%;
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border: 0;
  background: var(--card);
  color: var(--text);
  padding: 1rem;
  text-align: left;
  font-weight: 900;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  color: var(--orange-dark);
  font-size: 1.4rem;
  line-height: 1;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  padding: 0 1rem 1rem;
  color: var(--muted);
}

.legal-preview {
  padding: 3.5rem 0;
}

.site-footer {
  background: #15171b;
  color: #f4f5f7;
  padding: 2.5rem 0 1.2rem;
}

.site-footer p,
.site-footer a,
.footer-bottom {
  color: #c8ced8;
}

.site-footer h2 {
  margin-bottom: 0.7rem;
  font-size: 1rem;
}

.site-footer a {
  display: block;
  margin-bottom: 0.45rem;
}

.footer-brand {
  color: #fff;
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.legal-page {
  padding: 4rem 0;
}

.legal-card {
  max-width: 860px;
  padding: 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
}

.contact-form {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

@media (max-width: 860px) {
  .menu-toggle {
    display: block;
  }

  .nav-actions {
    position: fixed;
    inset: 72px 1rem auto 1rem;
    display: none;
    grid-template-columns: 1fr;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
    box-shadow: var(--shadow);
  }

  .nav-actions.is-open {
    display: grid;
  }

  .nav-actions:not(#main-menu) {
    position: static;
    display: flex;
    flex-wrap: wrap;
    padding: 0;
    border: 0;
    box-shadow: none;
  }

  .nav-actions a,
  .theme-toggle {
    justify-content: flex-start;
    width: 100%;
  }

  .nav-actions:not(#main-menu) a {
    width: auto;
  }

  .hero-grid,
  .tool-layout,
  .content-grid,
  .legal-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 3.6rem;
  }

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

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

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

@media (max-width: 620px) {
  .container,
  .navbar {
    width: min(100% - 1rem, var(--container));
  }

  .hero,
  .calculator-section,
  .tools-section,
  .utility-section,
  .faq-section,
  .education-section {
    padding-block: 3rem;
  }

  h1 {
    font-size: 2.35rem;
  }

  .type-selector,
  .proportion-grid,
  .tools-grid,
  .quick-tool-grid,
  .input-pair,
  .stats-grid,
  .checkbox-grid {
    grid-template-columns: 1fr;
  }

  .inline-heading,
  .history-item {
    align-items: stretch;
    grid-template-columns: 1fr;
    flex-direction: column;
  }

  .button,
  .button-row .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}


.tool-hero {
  padding: 4.5rem 0;
}

.tool-page-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1fr);
  gap: 1.25rem;
  align-items: start;
}

.tool-copy {
  display: grid;
  gap: 1rem;
}

.tool-copy p:not(.eyebrow) {
  color: var(--muted);
  font-size: 1.08rem;
}

.focused-tool {
  display: grid;
  gap: 1rem;
}

.explain-section {
  padding: 4rem 0;
}

.related-list {
  display: grid;
  gap: 0.55rem;
}

.related-list a {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.7rem 0.85rem;
  font-weight: 800;
}

.compact-history {
  padding: 1rem 0 0;
}

.page-side {
  box-shadow: none;
}

@media (max-width: 860px) {
  .tool-page-grid {
    grid-template-columns: 1fr;
  }
}