/* ============ DESIGN TOKENS ============ */
:root, [data-theme='light'] {
  /* Surfaces */
  --color-bg: #f6f6f6;
  --color-surface: #ffffff;
  --color-surface-2: #fbfbfb;
  --color-surface-offset: #eeeeee;
  --color-border: #dddddd;
  --color-divider: #e0dede;

  /* Text */
  --color-text: #333333;
  --color-text-muted: #6b6b6b;
  --color-text-faint: #949494;
  --color-text-inverse: #ffffff;

  /* Brand navy/slate (secondary) — matches athleticlab.com heading + footer color */
  --color-navy: #345771;
  --color-navy-2: #294052;

  /* Accent — exact athleticlab.com primary red */
  --color-accent: #990000;
  --color-accent-hover: #7a0000;
  --color-accent-active: #5c0000;
  --color-accent-highlight: #f7e3e3;

  /* Tier colors */
  --tier-elite: #b8860b;
  --tier-advanced: #2f7d4f;
  --tier-intermediate: #447294;
  --tier-novice: #b5680d;
  --tier-beginner: #7d7d7d;
  --tier-below: #cf2e2e;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 160ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 40 / 0.08);
  --shadow-md: 0 6px 16px oklch(0.2 0.01 40 / 0.10);
  --shadow-lg: 0 16px 40px oklch(0.2 0.01 40 / 0.16);

  --content-default: 1120px;
  --content-narrow: 760px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-16: 4rem;

  --font-display: 'Michroma', 'Arial Black', sans-serif;
  --font-body: 'Exo', 'Segoe UI', sans-serif;

  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.2vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.02rem + 0.5vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.25rem + 1.1vw, 2.1rem);
  --text-2xl: clamp(1.9rem, 1.4rem + 2vw, 3rem);
}

[data-theme='dark'] {
  --color-bg: #121417;
  --color-surface: #191c20;
  --color-surface-2: #1e2125;
  --color-surface-offset: #232629;
  --color-border: #33363a;
  --color-divider: #292c30;

  --color-text: #eceae6;
  --color-text-muted: #a6a4a0;
  --color-text-faint: #6c6a67;
  --color-text-inverse: #191c20;

  --color-navy: #0e1621;
  --color-navy-2: #16233390;

  --color-accent: #e2565c;
  --color-accent-hover: #ea7378;
  --color-accent-active: #f39397;
  --color-accent-highlight: #3a2226;

  --tier-elite: #d9a53a;
  --tier-advanced: #4e9d70;
  --tier-intermediate: #4f9bd6;
  --tier-novice: #d18b3f;
  --tier-beginner: #92959c;
  --tier-below: #e2565c;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 16px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 16px 40px oklch(0 0 0 / 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #121417;
    --color-surface: #191c20;
    --color-surface-2: #1e2125;
    --color-surface-offset: #232629;
    --color-border: #33363a;
    --color-divider: #292c30;
    --color-text: #eceae6;
    --color-text-muted: #a6a4a0;
    --color-text-faint: #6c6a67;
    --color-accent: #e2565c;
    --color-accent-hover: #ea7378;
    --color-accent-active: #f39397;
    --color-accent-highlight: #3a2226;
    --tier-elite: #d9a53a;
    --tier-advanced: #4e9d70;
    --tier-intermediate: #4f9bd6;
    --tier-novice: #d18b3f;
    --tier-beginner: #92959c;
    --tier-below: #e2565c;
  }
}

/* ============ BASE ============ */
.wrap {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-6, 1.5rem);
}

h1, h2, h3, h4 { font-family: var(--font-display); letter-spacing: -0.01em; }

/* ============ HEADER ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-divider);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.85rem;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-text);
  text-decoration: none;
}
.logo svg { color: var(--color-accent); flex-shrink: 0; }
.logo-word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
}
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-text-faint); }

/* ============ HERO ============ */
.hero {
  padding-block: clamp(2.5rem, 5vw, 4rem) 1.5rem;
  background:
    radial-gradient(ellipse 900px 380px at 15% -10%, color-mix(in oklab, var(--color-accent) 12%, transparent), transparent 70%),
    var(--color-bg);
}
.eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.6rem;
}
.hero h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.85rem;
}
.hero-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 62ch;
}
.hero-sub a { color: var(--color-accent); text-decoration: underline; text-decoration-color: color-mix(in oklab, var(--color-accent) 40%, transparent); }

/* ============ PANELS ============ */
.panel { padding-block: 1.75rem; }
.section-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: 1rem;
}

/* Setup panel */
.setup-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-block: 0.5rem 1.5rem;
  max-width: var(--content-default);
  margin-inline: auto;
  box-shadow: var(--shadow-sm);
}
.setup-panel .wrap { padding-block: 1.5rem; }
.setup-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1.25rem;
  align-items: end;
}
@media (max-width: 720px) {
  .setup-grid { grid-template-columns: 1fr; }
  .setup-cta { order: 3; }
}
.field-group { display: flex; flex-direction: column; gap: 0.4rem; }
.field-label { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.field-hint { font-size: var(--text-xs); color: var(--color-text-faint); }
.text-input {
  height: 46px;
  padding-inline: 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-base);
  width: 100%;
}
.text-input:focus { border-color: var(--color-accent); outline: none; box-shadow: 0 0 0 3px var(--color-accent-highlight); }

.segmented {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 3px;
  background: var(--color-surface-2);
  height: 46px;
  width: 100%;
}
.segmented-btn {
  flex: 1;
  border-radius: calc(var(--radius-md) - 3px);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}
.segmented-btn.is-active {
  background: var(--color-navy);
  color: #fff;
}
[data-theme='dark'] .segmented-btn.is-active { background: var(--color-accent); color: #fff; }

.btn {
  height: 46px;
  padding-inline: 1.4rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: var(--text-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-hover); }
.btn-primary:active { background: var(--color-accent-active); }
.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover { color: var(--color-text); border-color: var(--color-text-faint); }
.setup-note { margin-top: 1.1rem; font-size: var(--text-xs); color: var(--color-text-faint); max-width: 90ch; }

/* Profile panel */
.profile-panel { background: var(--color-navy); color: rgba(255,255,255,0.92); border-radius: var(--radius-lg); max-width: var(--content-default); margin-inline: auto; margin-block: 1.5rem; }
.profile-panel .section-title { color: #fff; }
.profile-panel.is-hidden { display: none; }
.profile-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2rem;
  align-items: center;
  padding-block: 0.5rem 1.5rem;
}
@media (max-width: 800px) { .profile-grid { grid-template-columns: 1fr; } }
.profile-chart-wrap { background: color-mix(in oklab, #fff 6%, transparent); border-radius: var(--radius-md); padding: 1rem; }
.profile-summary { display: flex; flex-direction: column; gap: 0.9rem; }
.profile-stat-row {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-size: var(--text-sm);
}
.profile-stat-row .stat-label { flex: 0 0 150px; color: color-mix(in oklab, #fff 78%, transparent); font-weight: 600; }
.profile-stat-row .stat-bar-track { flex: 1; display: block; height: 8px; border-radius: var(--radius-full); background: color-mix(in oklab, #fff 12%, transparent); overflow: hidden; }
.profile-stat-row .stat-bar-fill { display: block; height: 100%; border-radius: var(--radius-full); background: var(--color-accent); }
.profile-stat-row .stat-value { flex: 0 0 90px; text-align: right; font-weight: 700; color: #fff; }
.profile-headline { font-size: var(--text-base); color: color-mix(in oklab, #fff 90%, transparent); margin-bottom: 0.3rem; }
.profile-headline strong { color: #fff; }

/* Cards grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}
@media (max-width: 980px) { .cards-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .cards-grid { grid-template-columns: 1fr; } }

.test-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
}
.test-card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.5rem; }
.test-name { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 700; }
.test-tag {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.test-hint { font-size: var(--text-xs); color: var(--color-text-muted); }

.input-row { display: flex; gap: 0.5rem; align-items: center; }
.input-row .text-input { text-align: center; }
.time-input-group { display: flex; gap: 0.35rem; align-items: center; flex: 1; }
.time-input-group .text-input { width: 100%; }
.time-sep { font-weight: 700; color: var(--color-text-faint); }
.unit-suffix { font-size: var(--text-sm); color: var(--color-text-faint); flex: 0 0 auto; }

.result-box {
  margin-top: 0.25rem;
  border-radius: var(--radius-md);
  padding: 0.75rem 0.9rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  display: none;
}
.result-box.is-visible { display: block; }
.result-tier-row { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; margin-bottom: 0.5rem; }
.tier-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-full);
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.result-percentile { font-size: var(--text-sm); font-weight: 700; color: var(--color-text); }
.result-bar-track {
  position: relative;
  height: 10px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg,
    var(--tier-beginner) 0%, var(--tier-beginner) 20%,
    var(--tier-novice) 20%, var(--tier-novice) 40%,
    var(--tier-intermediate) 40%, var(--tier-intermediate) 60%,
    var(--tier-advanced) 60%, var(--tier-advanced) 80%,
    var(--tier-elite) 80%, var(--tier-elite) 100%);
  margin-bottom: 0.5rem;
}
.result-bar-marker {
  position: absolute;
  top: -4px;
  width: 3px;
  height: 18px;
  background: var(--color-text);
  border-radius: 2px;
  transform: translateX(-50%);
  box-shadow: 0 0 0 2px var(--color-surface-2);
}
.result-next {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.result-next strong { color: var(--color-text); }

/* About panel */
.about-panel { border-top: 1px solid var(--color-divider); margin-top: 1rem; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; padding-block: 1rem; }
@media (max-width: 720px) { .about-grid { grid-template-columns: 1fr; } }
.check-list { display: flex; flex-direction: column; gap: 0.5rem; font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: 0.75rem; }
.check-list li { padding-left: 1.1rem; position: relative; }
.check-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}
.check-list strong { color: var(--color-text); }

/* Footer */
.site-footer { border-top: 1px solid var(--color-divider); padding-block: 1.75rem 2.5rem; }
.footer-inner p { font-size: var(--text-xs); color: var(--color-text-faint); max-width: 90ch; }
.footer-inner a { color: var(--color-text-muted); }
.footer-fine { margin-top: 0.4rem; }

@media (max-width: 480px) {
  .wrap { padding-inline: 1.1rem; }
}