:root {
  --bg: #0f1419;
  --surface: #1a222d;
  --border: #2a3544;
  --text: #e8eef5;
  --muted: #8b9aad;
  --accent: #3dd6c3;
  --accent-dim: #2a9d8f;
  --error: #f07178;
  --radius: 14px;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

/* --- Landing hub (index) --- */
body.hub-page {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 1.5rem;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(61, 214, 195, 0.12), transparent),
    var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.hub {
  width: min(100%, 76rem);
  text-align: center;
}

.hub h1 {
  margin: 0 0 1.5rem;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.hub--aag {
  width: min(100%, 36rem);
}

.hub--aag .aag-hero-img {
  display: block;
  width: min(100%, 18rem);
  max-width: 100%;
  height: auto;
  margin: 0 auto 1.1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hub--aag h1 {
  margin-top: 0;
}

.aag-cta {
  display: inline-block;
  padding: 0.65rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent-dim);
  border-radius: 10px;
  text-decoration: none;
  transition: background 0.15s, box-shadow 0.15s;
}

.aag-cta:hover,
.aag-cta:focus-visible {
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 214, 195, 0.25);
  outline: none;
}

.hub--aag .aag-footer {
  margin-top: 2rem;
  width: 100%;
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--muted);
  text-align: left;
}

.hub--aag .aag-footer p {
  margin: 0;
}

body.hub-page .hub > .home-link {
  margin: 0 0 0.75rem;
  width: 100%;
  max-width: 100%;
  font-size: 0.9rem;
  text-align: left;
}

body.hub-page .hub > .home-link a {
  color: var(--accent-dim);
  text-decoration: none;
}

body.hub-page .hub > .home-link a:hover,
body.hub-page .hub > .home-link a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  outline: none;
}

body.hub-page .hub > .converters-hub-hero {
  display: block;
  width: min(100%, calc(36rem * 0.8 * 0.9));
  max-width: 100%;
  height: auto;
  margin: 0 auto 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

body.tool-page > .travel-hero-img {
  display: block;
  width: min(100%, calc(36rem * 0.8 * 0.9));
  max-width: 100%;
  height: auto;
  margin: 0 auto 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

body.tool-page > .travel-hero-img + .site-title {
  margin-top: -1.1rem;
}

body.tool-page.tool-page--narrow > .power-hero-img,
body.tool-page.tool-page--narrow > .pressure-hero-img,
body.tool-page.tool-page--narrow > .temperature-hero-img {
  display: block;
  width: min(100%, 32rem);
  max-width: 100%;
  height: auto;
  margin: 0 auto 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

body.tool-page.tool-page--narrow > .power-hero-img + .site-title,
body.tool-page.tool-page--narrow > .pressure-hero-img + .site-title,
body.tool-page.tool-page--narrow > .temperature-hero-img + .site-title {
  margin-top: -1.1rem;
}

body.tool-page.tool-page--narrow > .temperature-hero-img {
  width: min(100%, calc(32rem * 0.6));
}

body.tool-page > .liquids-hero-img {
  display: block;
  width: min(100%, 32rem);
  max-width: 100%;
  height: auto;
  margin: 0 auto 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

body.tool-page > .liquids-hero-img + .site-title {
  margin-top: -1.1rem;
}

body.tool-page > .area-hero-img {
  display: block;
  width: min(100%, 32rem);
  max-width: 100%;
  height: auto;
  margin: 0 auto 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

body.tool-page > .area-hero-img + .site-title {
  margin-top: -1.1rem;
}

body.tool-page > .weight-hero-img {
  display: block;
  width: min(100%, 32rem);
  max-width: 100%;
  height: auto;
  margin: 0 auto 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

body.tool-page > .weight-hero-img + .site-title {
  margin-top: -1.1rem;
}

body.tool-page > .nutrition-hero-img {
  display: block;
  width: min(100%, 32rem);
  max-width: 100%;
  height: auto;
  margin: 0 auto 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

body.tool-page > .nutrition-hero-img + .site-title {
  margin-top: -1.1rem;
}

.hub-rows {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.link-grid--hub {
  display: grid;
  gap: 1rem;
  width: 100%;
  align-items: stretch;
}

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

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

.link-grid--hub > .link-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
}

.link-grid--hub > .link-card > a {
  margin-top: auto;
  align-self: flex-start;
}

@media (max-width: 60rem) {
  .link-grid--hub-cols-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .link-grid--hub-cols-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 36rem) {
  .link-grid--hub-cols-4,
  .link-grid--hub-cols-3 {
    grid-template-columns: 1fr;
  }
}

.link-card {
  margin: 0;
  padding: 1.5rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: left;
}

.link-card h2 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.link-card p {
  margin: 0 0 1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.link-card a {
  display: inline-block;
  padding: 0.65rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent-dim);
  border-radius: 10px;
  text-decoration: none;
  transition: background 0.15s, box-shadow 0.15s;
}

.link-card a:hover,
.link-card a:focus-visible {
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 214, 195, 0.25);
  outline: none;
}

/* --- Converter tool shell (travel, temperature, area) --- */
body.tool-page {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 1.25rem;
  padding: 2rem 1.5rem 2.5rem;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(61, 214, 195, 0.12), transparent),
    var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.tool-page .site-title {
  margin: 0;
  width: min(100%, 66rem);
  max-width: 100%;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text);
  text-align: center;
}

.tool-page .page-main {
  width: min(100%, 66rem);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  align-items: stretch;
}

.tool-page .page-main > .panel-wide {
  grid-column: 1 / -1;
}

.tool-page .panel {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  box-shadow: var(--shadow);
}

.tool-page .panel h2 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.tool-page .lede {
  margin: 0 0 1.75rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.tool-page label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.45rem;
}

.tool-page .field {
  margin-bottom: 1.25rem;
}

.tool-page .area-field-rows,
.tool-page .liquids-field-rows {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 0.25rem;
}

.tool-page .area-field-row,
.tool-page .liquids-field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1.25rem;
  align-items: start;
}

.tool-page .area-field-row .field,
.tool-page .liquids-field-row .field {
  margin-bottom: 0;
}

@media (max-width: 42rem) {
  .tool-page .area-field-row,
  .tool-page .liquids-field-row {
    grid-template-columns: 1fr;
  }
}

.tool-page input[type="number"] {
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.tool-page input[type="number"]::placeholder {
  color: var(--muted);
  opacity: 0.6;
}

.tool-page input[type="number"]:focus {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 3px rgba(61, 214, 195, 0.2);
}

.tool-page input[type="number"]:user-invalid {
  border-color: var(--error);
}

.tool-page .readout {
  margin: -0.25rem 0 1.5rem;
  padding: 1rem 1.1rem;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: 10px;
}

.tool-page .readout-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.tool-page .readout-value {
  font-size: 1.35rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.tool-page .readout-value.readout-empty {
  color: var(--muted);
  font-weight: 500;
  font-size: 1.05rem;
}

.tool-page .meta {
  margin-top: 1.25rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.tool-page .meta code {
  font-size: 0.78em;
  padding: 0.12em 0.35em;
  background: var(--bg);
  border-radius: 4px;
  border: 1px solid var(--border);
}

@media (max-width: 52rem) {
  .tool-page:not(.tool-page--narrow) .site-title,
  .tool-page:not(.tool-page--narrow) .page-main {
    width: min(100%, 32rem);
  }

  .tool-page:not(.tool-page--narrow) .page-main {
    grid-template-columns: 1fr;
  }
}

.tool-page.tool-page--narrow .site-title,
.tool-page.tool-page--narrow .home-link,
.tool-page.tool-page--narrow .page-main {
  width: min(100%, 32rem);
}

.tool-page.tool-page--narrow .page-main {
  grid-template-columns: 1fr;
}

.tool-page .home-link {
  margin: 0;
  width: min(100%, 66rem);
  max-width: 100%;
  font-size: 0.9rem;
}

.tool-page.tool-page--narrow .home-link {
  width: min(100%, 32rem);
}

.tool-page .home-link a {
  color: var(--accent-dim);
  text-decoration: none;
}

.tool-page .home-link a:hover,
.tool-page .home-link a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  outline: none;
}