:root {
  --ink: #071a34;
  --ink-soft: #334155;
  --muted: #64748b;
  --line: #d8e0e8;
  --panel: #ffffff;
  --panel-soft: #f6f8fb;
  --lime: #a8e000;
  --lime-dark: #7bae00;
  --navy: #001d3d;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  background: #eef3f7;
}

body {
  margin: 0;
  color: var(--ink);
  background: #eef3f7;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  min-height: 78px;
  padding: 14px clamp(18px, 4vw, 48px);
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.brand {
  display: inline-grid;
  gap: 0;
  color: var(--ink);
  font-size: 30px;
  font-style: italic;
  font-weight: 900;
  line-height: 0.82;
  letter-spacing: 0;
  text-transform: uppercase;
}

.brand strong {
  color: var(--lime-dark);
  font-size: 0.72em;
}

.nav {
  display: flex;
  justify-content: center;
  gap: clamp(14px, 3vw, 36px);
  font-size: 14px;
  font-weight: 700;
  scrollbar-width: none;
  white-space: nowrap;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nav a {
  padding: 8px 0;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}

.nav a:hover,
.nav a.active {
  color: var(--ink);
  border-color: var(--lime);
}

.search-link {
  overflow: hidden;
  width: 32px;
  height: 32px;
  color: transparent;
  border: 0;
}

.search-link::before {
  display: block;
  width: 16px;
  height: 16px;
  margin: 5px;
  content: "";
  border: 3px solid var(--ink);
  border-radius: 50%;
}

.search-link::after {
  display: block;
  width: 10px;
  height: 3px;
  margin: -8px 0 0 21px;
  content: "";
  background: var(--ink);
  border-radius: 4px;
  transform: rotate(45deg);
}

.hero {
  position: relative;
  min-height: 470px;
  display: flex;
  align-items: center;
  padding: clamp(42px, 8vw, 86px) clamp(24px, 6vw, 68px);
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.78) 41%, rgba(255, 255, 255, 0.04) 72%),
    url("assets/hero-runner.png") center right / cover no-repeat;
}

.hero-copy {
  width: min(560px, 100%);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--lime-dark);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

.hero h1 {
  margin-bottom: 18px;
  font-size: clamp(48px, 8vw, 86px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero h1 span {
  color: var(--lime-dark);
}

.lede {
  max-width: 52ch;
  margin-bottom: 26px;
  color: var(--ink-soft);
  font-size: 18px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 6px;
  font-weight: 900;
}

.button.primary {
  background: var(--lime);
  color: var(--ink);
}

.button.secondary {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 24px clamp(24px, 6vw, 68px);
  color: #fff;
  background: var(--navy);
}

.proof-strip div {
  display: grid;
  grid-template-columns: 42px 1fr;
  column-gap: 12px;
  align-items: center;
}

.proof-strip p {
  grid-column: 2;
  margin: 0;
  color: #c9d5e1;
  font-size: 13px;
}

.icon,
.card-icon {
  display: inline-block;
  width: 34px;
  height: 34px;
  border: 2px solid currentColor;
  border-radius: 10px;
  color: var(--lime);
}

.timer,
.stopwatch,
.clock {
  border-radius: 50%;
}

.route,
.chart,
.split,
.heart {
  border-radius: 12px 12px 18px 12px;
}

.content-band {
  padding: 34px clamp(18px, 5vw, 48px);
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0;
  font-size: 20px;
  text-transform: uppercase;
}

.section-heading a {
  color: #2454a6;
  font-size: 13px;
  font-weight: 800;
}

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

.tools-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.empty-card,
.template-page,
.side-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
}

.tool-card {
  min-height: 150px;
  padding: 18px;
}

.tool-card h3,
.tool-card h2,
.story-card h3 {
  margin: 10px 0 7px;
  font-size: 16px;
}

.tool-card p,
.story-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 13px;
}

.linked-card {
  display: block;
}

.linked-card:hover {
  border-color: var(--lime-dark);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.12);
}

.story-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.story-card {
  overflow: hidden;
}

.story-card h3,
.story-card p,
.story-card .tag {
  padding-right: 16px;
  padding-left: 16px;
}

.story-card p:last-child {
  padding-bottom: 18px;
}

.story-image {
  min-height: 128px;
  background:
    linear-gradient(135deg, rgba(0, 29, 61, 0.86), rgba(168, 224, 0, 0.48)),
    url("assets/hero-runner.png") center / cover;
}

.story-image.watch {
  background-position: center 30%;
}

.story-image.trail,
.story-image.runner {
  background-position: right center;
}

.tag {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.site-footer {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 34px;
  padding: 38px clamp(24px, 6vw, 68px);
  color: #dce8f5;
  background: var(--navy);
}

.site-footer h2 {
  margin-bottom: 10px;
  color: #fff;
  font-size: 14px;
}

.site-footer a {
  display: block;
  margin: 7px 0;
  color: #dce8f5;
}

.site-footer p {
  color: #bdd0e2;
}

.footer-brand {
  color: #fff;
  margin-bottom: 14px;
}

.copyright {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 12px;
}

.page-shell {
  display: grid;
  grid-template-columns: minmax(0, 720px) minmax(220px, 360px);
  gap: 28px;
  width: min(1180px, calc(100% - 36px));
  margin: 32px auto;
  align-items: start;
}

.template-page,
.side-panel {
  padding: 24px;
}

.wide-template {
  grid-column: 1 / -1;
}

.breadcrumb {
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.template-page h1 {
  margin-bottom: 8px;
  font-size: clamp(34px, 5vw, 48px);
  line-height: 1;
}

.page-intro {
  max-width: 58ch;
  color: var(--ink-soft);
}

.calculator-frame {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.calculator-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 28px;
}

.pace-form {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.race-presets,
.time-fields {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.race-presets legend,
.time-fields legend,
.control-field span {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.preset-grid,
.input-grid,
.time-grid {
  display: grid;
  gap: 12px;
}

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

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

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

.preset-grid button,
.control-field input,
.control-field select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
}

.preset-grid button {
  background: var(--panel-soft);
  color: var(--ink);
  cursor: pointer;
  font-weight: 900;
}

.preset-grid button:hover,
.preset-grid button:focus-visible {
  border-color: var(--lime-dark);
  outline: 0;
}

.control-field input,
.control-field select {
  padding: 0 12px;
  background: #fff;
  color: var(--ink);
}

.control-field input:focus,
.control-field select:focus {
  border-color: var(--lime-dark);
  outline: 2px solid rgba(168, 224, 0, 0.3);
}

.form-message {
  min-height: 22px;
  margin: 0;
  color: #a33a00;
  font-size: 13px;
  font-weight: 800;
}

.field-row {
  display: grid;
  grid-template-columns: 130px 1fr;
  align-items: center;
  gap: 16px;
}

.field-row span {
  font-weight: 800;
}

.field-row div,
.article-lines span {
  display: block;
  height: 42px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.calculator-frame button {
  min-height: 44px;
  color: #fff;
  background: var(--navy);
  border: 0;
  border-radius: 6px;
  font-weight: 900;
}

.result-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

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

.split-page-shell {
  grid-template-columns: minmax(0, 920px) minmax(220px, 300px);
}

.split-calculator-page {
  min-width: 0;
}

.predictor-page-shell {
  grid-template-columns: minmax(0, 860px) minmax(220px, 300px);
}

.predictor-calculator-page {
  min-width: 0;
}

.heart-page-shell {
  grid-template-columns: minmax(0, 860px) minmax(220px, 300px);
}

.heart-calculator-page {
  min-width: 0;
}

.vo2-page-shell {
  grid-template-columns: minmax(0, 860px) minmax(220px, 300px);
}

.vo2-calculator-page {
  min-width: 0;
}

.mode-toggle {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  min-width: 0;
  margin: 0;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
}

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

.mode-toggle label {
  cursor: pointer;
}

.mode-toggle input {
  position: absolute;
  opacity: 0;
}

.mode-toggle span {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--ink-soft);
  font-weight: 900;
}

.mode-toggle input:checked + span {
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.08);
}

.mode-toggle input:focus-visible + span {
  outline: 2px solid rgba(168, 224, 0, 0.45);
}

.is-hidden {
  display: none;
}

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

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

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

.effort-field {
  max-width: 360px;
}

.split-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.split-actions .form-message {
  flex: 1;
}

.print-button,
.share-button {
  cursor: pointer;
}

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

.split-summary strong {
  font-size: clamp(26px, 4vw, 38px);
}

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

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

.vo2-summary {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.predictor-summary strong {
  font-size: clamp(24px, 4vw, 36px);
}

.heart-summary strong {
  font-size: clamp(24px, 4vw, 36px);
}

.vo2-summary strong {
  font-size: clamp(24px, 4vw, 36px);
}

.split-tables {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.split-table-block {
  min-width: 0;
}

.split-table-block h2,
.prediction-table-block h2 {
  margin-bottom: 10px;
  font-size: 17px;
  text-transform: uppercase;
}

.prediction-table-block {
  min-width: 0;
  margin-top: 28px;
}

.heart-table-block {
  min-width: 0;
  margin-top: 28px;
}

.vo2-table-block {
  min-width: 0;
  margin-top: 28px;
}

.heart-table-block h2,
.vo2-table-block h2,
.seo-content h2 {
  margin-bottom: 10px;
  font-size: 17px;
  text-transform: uppercase;
}

.split-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.split-table {
  width: 100%;
  min-width: 320px;
  border-collapse: collapse;
  background: #fff;
}

.prediction-table {
  min-width: 620px;
}

.heart-table {
  min-width: 620px;
}

.vo2-table {
  min-width: 620px;
}

.seo-content {
  display: grid;
  gap: 4px;
  margin-top: 28px;
}

.seo-content p {
  color: var(--ink-soft);
}

.zone-row th {
  border-left: 6px solid var(--lime-dark);
}

.zone-row-1 th {
  border-left-color: #66a6ff;
}

.zone-row-2 th {
  border-left-color: #22c55e;
}

.zone-row-3 th {
  border-left-color: #a8e000;
}

.zone-row-4 th {
  border-left-color: #f59e0b;
}

.zone-row-5 th {
  border-left-color: #ef4444;
}

.split-table th,
.split-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.split-table thead th {
  color: var(--ink-soft);
  background: var(--panel-soft);
  font-size: 12px;
  text-transform: uppercase;
}

.split-table tbody th {
  font-weight: 900;
}

.split-table tbody td:last-child {
  font-variant-numeric: tabular-nums;
  font-weight: 900;
}

.split-table tr:last-child th,
.split-table tr:last-child td {
  border-bottom: 0;
}

.checkpoint-row th,
.checkpoint-row td {
  background: #f8fbef;
}

.finish-row th,
.finish-row td {
  background: var(--navy);
  color: #fff;
}

.result-row div,
.empty-state {
  padding: 24px;
  text-align: center;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.result-row strong {
  display: block;
  font-size: 42px;
}

.result-row span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.mini-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

.mini-grid a {
  padding: 14px;
  text-align: center;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.mini-grid a:hover,
.mini-grid a.active,
.related-link:hover {
  border-color: var(--lime-dark);
}

.related-link {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  margin-top: 10px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: #2454a6;
  font-weight: 900;
}

.plan-table,
.comparison-table {
  display: grid;
  gap: 1px;
  overflow: hidden;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.plan-table div,
.comparison-table div {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 1px;
  background: var(--line);
}

.comparison-table div {
  grid-template-columns: 1.4fr 1fr 1fr;
}

.plan-table span,
.plan-table strong,
.comparison-table span,
.comparison-table strong {
  padding: 14px;
  background: #fff;
}

.hero-product,
.article-placeholder {
  height: 240px;
  margin: 28px 0;
  background:
    linear-gradient(135deg, rgba(168, 224, 0, 0.78), rgba(0, 29, 61, 0.18)),
    url("assets/hero-runner.png") center / cover;
  border-radius: 8px;
}

.article-lines {
  display: grid;
  gap: 12px;
}

.article-lines span:nth-child(1) {
  width: 100%;
}

.article-lines span:nth-child(2) {
  width: 88%;
}

.article-lines span:nth-child(3) {
  width: 64%;
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .search-link {
    grid-column: 2;
    grid-row: 1;
  }

  .proof-strip,
  .tools-grid,
  .story-grid,
  .calculator-list,
  .page-shell,
  .site-footer {
    grid-template-columns: 1fr;
  }

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

  .split-tables,
  .split-summary,
  .predictor-summary,
  .heart-summary,
  .vo2-summary {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 520px;
    align-items: end;
    background:
      linear-gradient(0deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.78) 52%, rgba(255, 255, 255, 0.06) 100%),
      url("assets/hero-runner.png") center / cover no-repeat;
  }
}

@media (max-width: 560px) {
  .site-header {
    gap: 14px;
    padding: 14px 16px;
  }

  .brand {
    font-size: 24px;
  }

  .hero {
    padding: 34px 18px;
  }

  .proof-strip {
    padding: 22px 18px;
  }

  .content-band {
    padding: 26px 16px;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .field-row,
  .result-row,
  .pace-results,
  .split-summary,
  .heart-summary,
  .preset-grid,
  .input-grid,
  .pace-input-grid,
  .heart-input-grid,
  .time-grid,
  .plan-table div,
  .comparison-table div {
    grid-template-columns: 1fr;
  }

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

  .print-button,
  .share-button {
    width: 100%;
  }
}

@media print {
  html,
  body {
    background: #fff;
  }

  .site-header,
  .side-panel,
  .split-form,
  .breadcrumb {
    display: none;
  }

  .page-shell,
  .split-page-shell,
  .predictor-page-shell,
  .heart-page-shell,
  .vo2-page-shell {
    display: block;
    width: auto;
    margin: 0;
  }

  .template-page,
  .split-calculator-page {
    padding: 0;
    border: 0;
    box-shadow: none;
  }

  .template-page h1 {
    font-size: 28px;
  }

  .page-intro {
    color: #000;
  }

  .result-row div {
    padding: 10px;
    border-color: #999;
  }

  .split-summary {
    grid-template-columns: repeat(4, 1fr);
  }

  .split-summary strong {
    font-size: 20px;
  }

  .split-tables {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    break-inside: avoid;
  }

  .split-table-wrap {
    overflow: visible;
    border-color: #999;
  }

  .split-table {
    min-width: 0;
    font-size: 10px;
  }

  .split-table th,
  .split-table td {
    padding: 4px 6px;
    border-color: #ccc;
  }

  .finish-row th,
  .finish-row td {
    color: #000;
    background: #e8e8e8;
  }
}