/* ── Variables (matches portfolio design system) ─────── */
:root {
  /* Primary Colors */
  --forest-deep: #1a3a2e;
  --moss-main: #2d5a4a;
  --sage-medium: #6b8f71;
  --fern-bright: #95c7a0;

  /* Neutral Tones */
  --stone-dark: #3d3d3d;
  --stone-medium: #6b6b6b;
  --mist-light: #e8ebe9;
  --cloud-white: #f7f9f8;
  --pure-white: #ffffff;

  /* Accent Colors */
  --earth-warm: #c9a277;
  --sky-pale: #d4e5e8;
  --bark-brown: #5a4a3a;

  /* Semantic */
  --error: #a85f52;

  /* Zone Colors */
  --zone-1: #6b8f71;
  --zone-2: #5fa06e;
  --zone-3: #c9a277;
  --zone-4: #a85f52;
  --zone-5: #8a4134;

  /* Typography */
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Layout */
  --max-width: 1100px;
  --transition: 0.3s ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(26, 58, 46, 0.05);
  --shadow-base: 0 2px 8px rgba(26, 58, 46, 0.08);
  --shadow-md: 0 4px 12px rgba(26, 58, 46, 0.1);
  --shadow-lg: 0 8px 24px rgba(26, 58, 46, 0.12);

  color-scheme: light;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--cloud-white);
  color: var(--stone-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--moss-main);
  text-decoration: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.hidden {
  display: none;
}

:focus-visible {
  outline: 2px solid var(--moss-main);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── Navbar ──────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 70px;
  background: rgba(247, 249, 248, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(107, 143, 113, 0.1);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--forest-deep);
  letter-spacing: 1px;
  transition: color var(--transition);
}

.nav-logo:hover {
  color: var(--moss-main);
}

.page-title {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--stone-medium);
  font-weight: 600;
}

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--moss-main);
  color: var(--pure-white);
  border-color: var(--moss-main);
}

.btn-primary:hover:not(:disabled) {
  background: var(--forest-deep);
  border-color: var(--forest-deep);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(42, 90, 74, 0.2);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-small {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  border: 1px solid var(--mist-light);
  background: var(--pure-white);
  color: var(--stone-dark);
  transition: all var(--transition);
}

.btn-small:hover {
  border-color: var(--moss-main);
  color: var(--moss-main);
}

.btn-small.active {
  background: var(--moss-main);
  color: var(--pure-white);
  border-color: var(--moss-main);
}

/* ── Setup Panel ─────────────────────────────────────── */
.setup-panel {
  display: flex;
  justify-content: center;
  margin: 110px auto 40px;
}

.setup-card {
  background: var(--pure-white);
  border: 1px solid var(--mist-light);
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow-base);
  max-width: 500px;
  width: 100%;
}

.setup-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--forest-deep);
}

.setup-card select {
  width: 100%;
  padding: 12px 14px;
  background: var(--cloud-white);
  border: 2px solid var(--mist-light);
  border-radius: 4px;
  color: var(--stone-dark);
  font-size: 0.95rem;
  font-family: var(--font-body);
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.setup-card select:focus {
  border-color: var(--moss-main);
  box-shadow: 0 0 0 3px rgba(45, 90, 74, 0.1);
}

.workout-meta {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--stone-medium);
  font-family: var(--font-mono);
  min-height: 1.4em;
}

.workout-meta.success {
  color: var(--moss-main);
}

.workout-meta.error {
  color: var(--error);
}

/* ── Chart ───────────────────────────────────────────── */
.chart-section {
  max-width: var(--max-width);
  margin: 0 auto 40px;
  background: var(--pure-white);
  border: 1px solid var(--mist-light);
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow-base);
}

.chart-wrapper {
  position: relative;
  height: 400px;
  width: 100%;
}

/* ── Chart Controls ──────────────────────────────────── */
.chart-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

/* ── Zone Toggles ────────────────────────────────────── */
.zone-toggles {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.zone-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  border: 1.5px solid var(--mist-light);
  background: var(--pure-white);
  color: var(--stone-medium);
  transition: all var(--transition);
}

.zone-pill:hover {
  border-color: var(--stone-medium);
}

.zone-pill-1.active {
  background: var(--zone-1);
  border-color: var(--zone-1);
  color: var(--pure-white);
}

.zone-pill-2.active {
  background: var(--zone-2);
  border-color: var(--zone-2);
  color: var(--pure-white);
}

.zone-pill-3.active {
  background: var(--zone-3);
  border-color: var(--zone-3);
  color: var(--pure-white);
}

.zone-pill-4.active {
  background: var(--zone-4);
  border-color: var(--zone-4);
  color: var(--pure-white);
}

.zone-pill-5.active {
  background: var(--zone-5);
  border-color: var(--zone-5);
  color: var(--pure-white);
}

.zone-pill-all {
  background: var(--cloud-white);
  border-color: var(--mist-light);
  color: var(--stone-medium);
}

.zone-pill-all:hover {
  border-color: var(--moss-main);
  color: var(--moss-main);
}

/* ── Zone Legend Note ─────────────────────────────────── */
.zone-legend-note {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--cloud-white);
  border: 1px solid var(--mist-light);
  border-radius: 8px;
}

.zone-legend-note p {
  font-size: 0.8rem;
  color: var(--stone-medium);
  line-height: 1.5;
}

.zone-legend-note strong {
  color: var(--stone-dark);
}

/* ── Block Legend ────────────────────────────────────── */
.block-legend {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--cloud-white);
  border: 1px solid var(--mist-light);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.block-legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: 4px;
  transition: background var(--transition);
}

.block-legend-item:hover {
  background: rgba(45, 90, 74, 0.06);
}

.block-legend-swatch {
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.block-legend-name {
  flex: 1;
  font-weight: 600;
  color: var(--stone-dark);
  font-family: var(--font-display);
}

.block-legend-time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--stone-medium);
}

.block-legend-no-data {
  opacity: 0.55;
  font-style: italic;
}

.block-legend-no-data .block-legend-time {
  font-style: italic;
}

/* ── Segment Panel ───────────────────────────────────── */
.segment-panel {
  margin-top: 20px;
  padding: 20px;
  background: var(--cloud-white);
  border: 1px solid var(--mist-light);
  border-radius: 8px;
}

.segment-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.segment-header h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--forest-deep);
}

.segment-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.segment-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.segment-stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--stone-medium);
}

.segment-stat-value {
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--moss-main);
}

.segment-zones {
  grid-column: 1 / -1;
}

.segment-zone {
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-mono);
  margin-right: 12px;
}

.segment-zone.dimmed {
  opacity: 0.35;
}

/* ── Stats Grid ──────────────────────────────────────── */
.stats-section {
  max-width: var(--max-width);
  margin: 0 auto 40px;
}

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

.stat-card {
  background: var(--pure-white);
  border: 1px solid var(--mist-light);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.stat-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--stone-medium);
  margin-bottom: 12px;
}

.stat-values {
  display: flex;
  justify-content: center;
}

.stat-zach {
  font-size: 1.3rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--moss-main);
}

.stat-name {
  display: block;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--stone-medium);
  margin-top: 2px;
  font-family: var(--font-body);
}

/* ── Performance Insights ────────────────────────────── */
.insights-section {
  max-width: var(--max-width);
  margin: 0 auto 40px;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--forest-deep);
  margin-bottom: 20px;
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.insight-card {
  background: var(--pure-white);
  border: 1px solid var(--mist-light);
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.insight-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--forest-deep);
  margin-bottom: 16px;
}

/* ── Zone Breakdown (doughnut) ───────────────────────── */
.zone-chart-wrapper {
  max-width: 200px;
  margin: 0 auto 16px;
}

.zone-breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.zone-list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
  transition: background var(--transition);
}

.zone-list-item:hover {
  background: rgba(45, 90, 74, 0.06);
}

.zone-list-item.dimmed {
  opacity: 0.4;
}

.zone-list-swatch {
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.zone-list-name {
  flex: 1;
  color: var(--stone-dark);
}

.zone-list-time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--stone-medium);
}

.zone-list-pct {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--moss-main);
  min-width: 32px;
  text-align: right;
}

/* ── Recovery Analysis ───────────────────────────────── */
.recovery-metrics {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.recovery-metric {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.recovery-metric-label {
  font-size: 0.8rem;
  color: var(--stone-medium);
}

.recovery-metric-value {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--moss-main);
}

.recovery-table-wrapper {
  overflow-x: auto;
}

.recovery-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.recovery-table th {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 2px solid var(--mist-light);
  color: var(--stone-medium);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.7rem;
}

.recovery-table td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--mist-light);
  font-family: var(--font-mono);
  color: var(--stone-dark);
}

.recovery-table tbody tr {
  cursor: pointer;
  transition: background var(--transition);
}

.recovery-table tbody tr:hover {
  background: rgba(45, 90, 74, 0.06);
}

/* ── Peak Intervals ──────────────────────────────────── */
.peak-intervals {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.peak-interval-card {
  padding: 16px;
  background: var(--cloud-white);
  border: 1px solid var(--mist-light);
  border-radius: 6px;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.peak-interval-card:hover {
  border-color: var(--moss-main);
  box-shadow: var(--shadow-sm);
}

.peak-interval-card h4 {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--forest-deep);
  margin-bottom: 10px;
}

.peak-interval-stats {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.peak-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.peak-stat-label {
  font-size: 0.8rem;
  color: var(--stone-medium);
}

.peak-stat-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--moss-main);
}

/* ── Insight Header ───────────────────────────────────── */
.insight-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.insight-header h3 {
  margin-bottom: 0;
}

/* ── Tooltip ─────────────────────────────────────────── */
.tooltip-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--sage-medium);
  background: transparent;
  color: var(--sage-medium);
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-body);
  font-style: italic;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
}

.tooltip-trigger:hover,
.tooltip-trigger.active {
  background: var(--moss-main);
  border-color: var(--moss-main);
  color: var(--pure-white);
}

.tooltip-content {
  margin-bottom: 16px;
  padding: 14px;
  background: var(--cloud-white);
  border: 1px solid var(--mist-light);
  border-radius: 6px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--stone-medium);
}

.tooltip-content p {
  margin-bottom: 8px;
}

.tooltip-content p:last-child {
  margin-bottom: 0;
}

.tooltip-content strong {
  color: var(--stone-dark);
}

.tooltip-content a {
  color: var(--moss-main);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.tooltip-source {
  font-size: 0.75rem;
  color: var(--stone-medium);
  border-top: 1px solid var(--mist-light);
  padding-top: 8px;
  margin-top: 8px;
}

/* ── Cardiac Drift ───────────────────────────────────── */
.cardiac-drift-content,
.sustained-effort-content {
  cursor: pointer;
}

.drift-rating {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  text-align: center;
  transition: box-shadow var(--transition);
}

.cardiac-drift-content:hover .drift-rating {
  box-shadow: var(--shadow-sm);
}

.drift-pct {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
}

.drift-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

.drift-excellent {
  background: rgba(107, 143, 113, 0.12);
}

.drift-excellent .drift-pct { color: var(--zone-1); }
.drift-excellent .drift-label { color: var(--zone-1); }

.drift-normal {
  background: rgba(201, 162, 119, 0.12);
}

.drift-normal .drift-pct { color: var(--earth-warm); }
.drift-normal .drift-label { color: var(--earth-warm); }

.drift-high {
  background: rgba(168, 95, 82, 0.12);
}

.drift-high .drift-pct { color: var(--zone-4); }
.drift-high .drift-label { color: var(--zone-4); }

.drift-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.drift-detail {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drift-detail-label {
  font-size: 0.8rem;
  color: var(--stone-medium);
}

.drift-detail-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--moss-main);
}

/* ── Sustained Effort ────────────────────────────────── */
.sustained-rating {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  text-align: center;
  transition: box-shadow var(--transition);
}

.sustained-effort-content:hover .sustained-rating {
  box-shadow: var(--shadow-sm);
}

.sustained-duration {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
}

.sustained-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

.sustained-elite {
  background: rgba(45, 90, 74, 0.12);
}
.sustained-elite .sustained-duration { color: var(--moss-main); }
.sustained-elite .sustained-label { color: var(--moss-main); }

.sustained-strong {
  background: rgba(107, 143, 113, 0.12);
}
.sustained-strong .sustained-duration { color: var(--zone-1); }
.sustained-strong .sustained-label { color: var(--zone-1); }

.sustained-building {
  background: rgba(201, 162, 119, 0.12);
}
.sustained-building .sustained-duration { color: var(--earth-warm); }
.sustained-building .sustained-label { color: var(--earth-warm); }

.sustained-developing {
  background: rgba(168, 95, 82, 0.12);
}
.sustained-developing .sustained-duration { color: var(--zone-4); }
.sustained-developing .sustained-label { color: var(--zone-4); }

.sustained-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sustained-detail {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sustained-detail-label {
  font-size: 0.8rem;
  color: var(--stone-medium);
}

.sustained-detail-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--moss-main);
}

/* ── TRIMP Score ──────────────────────────────────────── */
.trimp-rating {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  text-align: center;
}

.trimp-value {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
}

.trimp-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

.trimp-easy {
  background: rgba(107, 143, 113, 0.12);
}
.trimp-easy .trimp-value { color: var(--zone-1); }
.trimp-easy .trimp-label { color: var(--zone-1); }

.trimp-moderate {
  background: rgba(95, 160, 110, 0.12);
}
.trimp-moderate .trimp-value { color: var(--zone-2); }
.trimp-moderate .trimp-label { color: var(--zone-2); }

.trimp-hard {
  background: rgba(201, 162, 119, 0.12);
}
.trimp-hard .trimp-value { color: var(--earth-warm); }
.trimp-hard .trimp-label { color: var(--earth-warm); }

.trimp-very-hard {
  background: rgba(168, 95, 82, 0.12);
}
.trimp-very-hard .trimp-value { color: var(--zone-4); }
.trimp-very-hard .trimp-label { color: var(--zone-4); }

.trimp-breakdown {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.trimp-zone-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  padding: 2px 0;
}

.trimp-zone-row.dimmed {
  opacity: 0.4;
}

.trimp-zone-swatch {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 2px;
}

.trimp-zone-name {
  font-weight: 600;
  color: var(--stone-dark);
  min-width: 24px;
}

.trimp-zone-calc {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--stone-medium);
}

.trimp-zone-val {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--moss-main);
  min-width: 28px;
  text-align: right;
}

/* ── No Data Message ─────────────────────────────────── */
.no-data-msg {
  font-size: 0.85rem;
  color: var(--stone-medium);
  font-style: italic;
}

/* ── Footer ──────────────────────────────────────────── */
.footer {
  padding: 32px 24px;
  text-align: center;
  color: var(--stone-medium);
  font-size: 0.85rem;
  border-top: 1px solid var(--mist-light);
  margin-top: 40px;
}

/* ── Accessibility ───────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {
  .navbar {
    padding: 0 20px;
  }

  .setup-panel {
    margin-top: 90px;
  }

  .chart-controls {
    flex-direction: column;
    align-items: flex-start;
  }

  .zone-toggles {
    margin-left: 0;
  }

  .chart-wrapper {
    height: 280px;
  }

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

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

  .segment-stats {
    grid-template-columns: 1fr 1fr;
  }
}