:root {
  --color-bg: #000000;
  --color-card: #050505;
  --color-border: #1F1F1F;
  --color-text: #ffffff;
  --color-text-muted: #9a9a9a;
  --color-accent: #22FAEE; /* Suprahuman Cyan */
  --color-accent-dim: rgba(34, 250, 238, 0.1);
  --color-warn: #FFB454;
  --glass-bg: rgba(5, 5, 5, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;

  font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
  color-scheme: dark;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  background-image: radial-gradient(circle at 50% 0%, #111111 0%, #000000 70%);
  background-repeat: no-repeat;
  color: var(--color-text);
  font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  align-items: center;
}

a {
  color: var(--color-accent);
}

.page {
  width: 100%;
  max-width: 1080px;
  box-sizing: border-box;
  padding: 5vw 8vw;
}

.logo-container {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.logo-icon {
  height: 60px;
  opacity: 0.9;
}

.logo-icon-sm {
  height: 48px;
  opacity: 0.9;
}

.coach-byline {
  /* The 0.6875rem floor with 0.14em tracking keeps this on one line down to a 320px phone. */
  margin: 0 0 var(--space-md);
  color: var(--color-accent);
  font-size: clamp(0.6875rem, 0.45vw + 0.58rem, 0.875rem);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.masthead {
  margin-bottom: var(--space-lg);
}

.accent-line {
  width: 60px;
  height: 4px;
  background-color: var(--color-accent);
  margin-bottom: var(--space-md);
  box-shadow: 0 0 10px rgba(34, 250, 238, 0.5);
}

h1 {
  font-size: clamp(2.25rem, 4vw + 1rem, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 var(--space-md);
  text-transform: uppercase;
}

.subtitle {
  font-size: clamp(1rem, 1.2vw + 0.45rem, 1.25rem);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* Sticky jump nav */
.jump-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  width: 100%;
  max-width: 1080px;
  box-sizing: border-box;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding: 12px 8vw;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
}

.jump-nav a {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.jump-nav a:hover,
.jump-nav a:focus-visible {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Sections */
.section {
  scroll-margin-top: 110px;
  margin-top: var(--space-xl);
}

.section:first-of-type {
  margin-top: 0;
}

/* In-page link targets clear the sticky nav too */
#glp1, #nogym, #modes, #west {
  scroll-margin-top: 110px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.section-number {
  font-size: clamp(1.875rem, 2.8vw + 0.65rem, 2.5rem);
  font-weight: 800;
  color: var(--color-text-muted);
  line-height: 0.8;
  opacity: 0.5;
}

.section-head h2 {
  font-size: clamp(1.5rem, 2.2vw + 0.6rem, 2rem);
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

.section-desc {
  font-size: clamp(1rem, 1.2vw + 0.4rem, 1.2rem);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0;
  text-transform: none;
}

.thesis {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-accent);
  margin: 0 0 var(--space-md);
}

/* Cards */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.card {
  padding: var(--space-lg);
  border-radius: 12px;
  border-left: 4px solid #333;
  margin-top: var(--space-md);
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-sm);
}

.card > p {
  font-size: 1.05rem;
  color: #ddd;
  margin: 0 0 var(--space-sm);
}

.card > p:last-child {
  margin-bottom: 0;
}

.card-accent {
  background: rgba(34, 250, 238, 0.03);
  border: 1px solid var(--color-accent-dim);
  border-left: 4px solid var(--color-accent);
}

.card-warn {
  background: rgba(255, 180, 84, 0.04);
  border: 1px solid rgba(255, 180, 84, 0.16);
  border-left: 4px solid var(--color-warn);
}

.card-warn h3 {
  color: var(--color-warn);
}

.action-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.action-list li {
  position: relative;
  padding-left: var(--space-lg);
  font-size: 1.05rem;
  color: #ddd;
}

.action-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-accent);
  font-weight: bold;
}

.card-warn .action-list li::before {
  color: var(--color-warn);
}

.action-list li strong {
  color: var(--color-text);
  font-weight: 600;
}

.small-note {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin: var(--space-sm) 0 0;
}

.card > p.small-note {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

/* Three questions and trip modes */
.tri-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.tri-card {
  padding: var(--space-md);
  border-radius: 12px;
}

.tri-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 var(--space-xs);
  color: var(--color-accent);
}

.tri-card p {
  font-size: 1rem;
  color: #ddd;
  margin: 0 0 var(--space-xs);
}

.tri-card p:last-child {
  margin-bottom: 0;
}

.tri-card strong {
  color: var(--color-text);
  font-weight: 600;
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
}

.data-table th {
  text-align: left;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 0 var(--space-sm) var(--space-xs) 0;
  border-bottom: 2px solid var(--color-border);
}

.data-table td {
  padding: 12px var(--space-sm) 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: #ddd;
  vertical-align: top;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table td:first-child {
  color: var(--color-text);
  font-weight: 600;
}

/* Jet lag calculator */
.calc-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.calc-inputs label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.calc-inputs select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  background: #0d0d0d;
  color: var(--color-text);
  border: 1px solid #333;
  border-radius: 8px;
  font: inherit;
  font-size: 1rem;
  font-weight: 500;
}

.calc-inputs select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.calc-result {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.calc-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-sm);
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  font-size: 1.05rem;
}

.calc-row span:first-child {
  color: var(--color-text-muted);
  font-weight: 600;
  white-space: nowrap;
}

.calc-row span:last-child {
  color: var(--color-text);
  font-weight: 600;
  text-align: right;
}

/* Swap rows for ordering abroad */
.swap-groups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.swap-group {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: var(--space-md);
  border-radius: 8px;
}

.swap-group h3 {
  margin: 0 0 var(--space-xs);
  font-size: 1.15rem;
  color: var(--color-accent);
}

.swap-row {
  padding: var(--space-xs) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 1rem;
}

.swap-row:last-child {
  border-bottom: none;
}

.swap-from {
  color: var(--color-text-muted);
}

.swap-to {
  position: relative;
  padding-left: var(--space-md);
  font-weight: 600;
}

.swap-to::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-accent);
  font-weight: bold;
}

/* Footer */
.site-footer {
  width: 100%;
  max-width: 1080px;
  box-sizing: border-box;
  padding: var(--space-xl) 8vw;
  margin-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.site-footer .logo-icon-sm {
  margin-bottom: var(--space-sm);
}

.footer-recap {
  font-size: clamp(1.1rem, 1.2vw + 0.6rem, 1.4rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-sm);
}

.footer-small {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0 auto var(--space-xs);
  max-width: 640px;
}

@media (max-width: 680px) {
  .page {
    padding: 8vw 6vw;
  }

  .jump-nav {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 10px 6vw;
  }

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

  .section, #glp1, #nogym, #modes, #west {
    scroll-margin-top: 72px;
  }

  .section-head {
    align-items: center;
  }

  .section-head h2 {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .card {
    padding: var(--space-md);
  }

  .tri-grid,
  .swap-groups,
  .calc-inputs {
    grid-template-columns: 1fr;
  }

  /* Tables stack: each row becomes a block, each cell carries its own label */
  .data-table thead {
    display: none;
  }

  .data-table,
  .data-table tbody,
  .data-table tr,
  .data-table td {
    display: block;
    width: 100%;
    box-sizing: border-box;
  }

  .data-table tr {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .data-table tr:last-child {
    border-bottom: none;
  }

  .data-table td {
    padding: 2px 0;
    border-bottom: none;
  }

  .data-table td:first-child {
    font-size: 1.05rem;
    margin-bottom: 4px;
  }

  .data-table td[data-label]::before {
    content: attr(data-label) ": ";
    color: var(--color-text-muted);
    font-weight: 600;
  }
}