/* =============================================
   main.css — Design tokens & component styles
   ============================================= */

/* --- Design Tokens --- */
:root {
  /* Colors */
  --bg:       #0c0c0e;
  --surface:  #141416;
  --card:     #1a1a1e;
  --border:   #2a2a30;
  --accent:   #e8ff47;
  --accent2:  #ff6b35;
  --accent3:  #47c5ff;
  --text:     #f0f0f0;
  --muted:    #888;

  /* Run-type colors */
  --easy:     #4ade80;
  --tempo:    #facc15;
  --long:     #f87171;
  --interval: #c084fc;

  /* Spacing scale */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  40px;
  --space-2xl: 56px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Typography */
  --font-display: 'Bebas Neue', sans-serif;
  --font-mono:    'DM Mono', monospace;
  --font-body:    'DM Sans', sans-serif;
}

/* --- Base --- */
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

/* --- Nav --- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  height: 56px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-brand-icon {
  font-size: 18px;
  line-height: 1;
}

.nav-brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 1px;
  color: var(--text);
}

.nav-brand-name span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  text-decoration: none;
}

.nav-link:hover {
  color: var(--text);
  background: var(--card);
  border-color: var(--border);
}

.nav-link.active {
  color: var(--accent);
  border-color: #e8ff4740;
  background: #e8ff4710;
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--muted);
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* --- Header --- */
header {
  padding: 60px var(--space-xl) var(--space-xl);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

header::before {
  content: '26.2';
  font-family: var(--font-display);
  font-size: 260px;
  color: #ffffff08;
  position: absolute;
  right: -20px;
  top: -30px;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.header-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(52px, 8vw, 96px);
  line-height: 0.9;
  letter-spacing: 1px;
  margin-bottom: var(--space-lg);
}

h1 span { color: var(--accent); }

.header-stats {
  display: flex;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

/* --- Stat --- */
.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.stat-val {
  font-family: var(--font-display);
  font-size: 32px;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
}

/* --- Legend --- */
.legend {
  display: flex;
  gap: 20px;
  padding: 20px var(--space-xl);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  background: var(--surface);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* --- Pace Guide --- */
.pace-guide {
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.pace-guide h3 {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

.paces {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.pace-chip {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px var(--space-md);
  font-family: var(--font-mono);
  font-size: 12px;
}

.pace-chip span {
  display: block;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 2px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* --- Main Layout --- */
main {
  padding: var(--space-xl);
}

/* --- Phase --- */
.phase {
  margin-bottom: var(--space-2xl);
}

.phase-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
}

.phase-title {
  font-family: var(--font-display);
  font-size: 36px;
  letter-spacing: 1px;
}

.phase-subtitle {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
}

/* --- Weeks Grid --- */
.weeks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-md);
}

/* --- Week Card --- */
.week-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.2s;
}

.week-card:hover { border-color: #444; }

.week-header {
  padding: 14px 18px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.week-num {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 1px;
}

.week-mileage {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
}

.week-note {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent2);
  padding: 0 18px 10px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

/* --- Runs --- */
.runs {
  padding: 12px 18px;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.run {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  line-height: 1.4;
}

.run-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 4px;
}

.run-day {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  min-width: 34px;
  margin-top: 2px;
}

.run-desc {
  color: #ccc;
  font-size: 12.5px;
}

.run-desc strong {
  color: var(--text);
  font-weight: 500;
}

/* --- Badges --- */
.taper-badge {
  display: inline-block;
  background: #e8ff4720;
  color: var(--accent);
  border: 1px solid #e8ff4740;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 2px 8px;
  margin-left: 6px;
  vertical-align: middle;
}

/* --- Race Week --- */
.race-week {
  border-color: var(--accent) !important;
}

.race-week .week-header {
  background: #e8ff4710;
}

/* --- Tips Section --- */
.tips {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: var(--space-xl);
}

.tips h3 {
  font-family: var(--font-display);
  font-size: 28px;
  margin-bottom: 20px;
  color: var(--accent);
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-md);
}

.tip {
  border-left: 2px solid var(--accent3);
  padding-left: 14px;
}

.tip h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent3);
  margin-bottom: 6px;
}

.tip p {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.6;
}

/* --- Footer --- */
footer {
  text-align: center;
  padding: 30px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #444;
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .site-nav { padding: 0 20px; }

  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open { display: flex; }

  .nav-link { padding: 10px 14px; }

  header { padding: 40px 20px 30px; }
  main   { padding: 24px 20px; }
  .legend,
  .pace-guide { padding-left: 20px; padding-right: 20px; }
  .header-stats { gap: 20px; }
  .weeks-grid { grid-template-columns: 1fr; }
}