/* ============================================================
   StayStacking — Styles
   Color palette:
     --sky:   #b5cbd8  light blue-grey (backgrounds, borders)
     --slate: #44525f  dark blue-grey  (text, header)
     --earth: #b57400  brown           (primary accent, active)
     --amber: #ffa91c  yellow-orange   (highlights, warning)
     --coral: #fe9553  orange          (secondary accent, danger)
   ============================================================ */

:root {
  --sky:    #b5cbd8;
  --slate:  #44525f;
  --earth:  #b57400;
  --amber:  #ffa91c;
  --coral:  #fe9553;
  --white:  #ffffff;
  --bg:     #f0f4f7;
  --card-bg:#ffffff;
  --border: #d4e0e8;
  --muted:  #7a8f9c;
  --text:   #2e3d47;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(68, 82, 95, 0.10);
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
}

/* ============================================================
   AUTH SCREEN
   ============================================================ */

.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, var(--slate) 0%, #2e3d47 100%);
}

.auth-card {
  background: var(--white);
  border-radius: 16px;
  padding: 48px 40px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  max-width: 360px;
  width: 90%;
}

.brand {
  font-size: 2rem;
  font-weight: 700;
  color: var(--earth);
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.brand-tagline {
  color: var(--muted);
  margin-bottom: 32px;
  font-size: 0.95rem;
  line-height: 1.5;
}

.btn-strava {
  background: #fc4c02;
  color: var(--white);
  border: none;
  border-radius: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: background 0.15s, transform 0.1s;
}

.btn-strava:hover  { background: #e04402; }
.btn-strava:active { transform: scale(0.98); }

.auth-error {
  margin-top: 16px;
  color: var(--coral);
  font-size: 0.9rem;
}

/* ============================================================
   LAYOUT
   ============================================================ */

.staging-banner {
  background: #FFD600;
  color: #000;
  text-align: center;
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  padding: 4px 0;
}

.app-header {
  background: var(--slate);
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.brand-small {
  color: var(--earth);
  font-weight: 700;
  font-size: 1rem;
  white-space: nowrap;
  min-width: 110px;
}

.tab-bar {
  display: flex;
  flex: 1;
  gap: 4px;
}

.tab-btn {
  flex: 1;
  background: transparent;
  color: var(--sky);
  border: none;
  padding: 8px 6px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}

.tab-btn:hover  { background: rgba(181, 203, 216, 0.15); }
.tab-btn.active { background: var(--earth); color: var(--white); }
.tab-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.tab-btn:disabled:hover { background: transparent; }

.btn-sync {
  background: transparent;
  color: var(--sky);
  border: 1px solid var(--sky);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}

.btn-sync:hover { background: rgba(181, 203, 216, 0.2); }
.btn-sync.syncing { opacity: 0.6; cursor: default; }

/* ============================================================
   TAB PANELS
   ============================================================ */

.tab-panel {
  min-height: calc(100vh - 56px);
  padding: 16px;
}

.panel-content {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#tab-load {
  padding: 0;
  height: calc(100vh - 56px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#tab-load .panel-content {
  max-width: none;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  padding: 8px 16px;
  gap: 8px;
}

#tab-load .chart-area {
  flex: 1;
  min-height: 0;
  align-items: stretch;
}

#tab-load .chart-area .chart-container {
  flex: 1;
  min-height: 0;
}

.hidden { display: none !important; }

/* ============================================================
   CARDS
   ============================================================ */

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--slate);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

/* ============================================================
   RECOVERY BANNER
   ============================================================ */

.recovery-banner {
  border-radius: var(--radius);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid transparent;
}

.recovery-green  { background: #e6f9ed; border-color: #2d7a2d; color: #1e5e1e; }
.recovery-yellow { background: #fff8e1; border-color: var(--amber); color: #7a5800; }
.recovery-red    { background: #fdf0ec; border-color: var(--coral); color: #8a2e00; }
.recovery-unknown { background: #f0f4f7; border-color: var(--border); color: var(--muted); }

#recovery-icon { font-size: 1.4rem; }

/* ============================================================
   FORM ELEMENTS
   ============================================================ */

.form-group {
  margin-bottom: 16px;
}

.form-group:last-child { margin-bottom: 0; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--slate);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.form-group.half { flex: 1; }

/* Sliders */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--sky);
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--earth);
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--earth);
  cursor: pointer;
  border: none;
}

.slider-val {
  font-weight: 700;
  color: var(--earth);
  font-size: 1rem;
}

/* Select */
.select {
  width: 100%;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  background: var(--white);
  color: var(--text);
  cursor: pointer;
  outline: none;
}

.select:focus { border-color: var(--earth); }

/* Text input */
.text-input {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  color: var(--text);
  outline: none;
  background: var(--white);
}

.text-input:focus { border-color: var(--earth); }

/* Toggle group (Yes/No buttons) */
.toggle-group {
  display: flex;
  gap: 6px;
}

.toggle-btn {
  flex: 1;
  padding: 8px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  background: var(--white);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.toggle-btn.active {
  border-color: var(--earth);
  background: var(--earth);
  color: var(--white);
}

/* Checkboxes */
.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  border: 1.5px solid transparent;
  transition: border-color 0.12s;
}

.check-item:hover { border-color: var(--sky); }

.check-item input[type="checkbox"] {
  accent-color: var(--earth);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 7px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s, transform 0.1s;
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: default; }

.btn-primary { background: var(--earth); color: var(--white); }
.btn-primary:hover:not(:disabled) { opacity: 0.9; }

.btn-danger  { background: var(--coral); color: var(--white); }
.btn-danger:hover:not(:disabled)  { opacity: 0.9; }

.btn-full { width: 100%; margin-top: 8px; }

/* ============================================================
   SUGGESTED ACTIVITIES
   ============================================================ */

.suggestion-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.suggestion-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg);
  border-radius: 7px;
  font-size: 0.9rem;
  border-left: 3px solid var(--earth);
}

/* ============================================================
   INJURY TRACKING
   ============================================================ */

.injury-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

/* Toggle switch */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.switch-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 24px;
  cursor: pointer;
  transition: background 0.2s;
}

.switch-slider::before {
  content: '';
  position: absolute;
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background: var(--white);
  border-radius: 50%;
  transition: transform 0.2s;
}

.switch input:checked + .switch-slider { background: var(--earth); }
.switch input:checked + .switch-slider::before { transform: translateX(20px); }

#injury-panel {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.ldi-display {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: 8px;
  margin-bottom: 12px;
}

.ldi-label { font-size: 0.85rem; font-weight: 600; color: var(--slate); flex: 1; }
.ldi-value { font-size: 1.4rem; font-weight: 700; color: var(--earth); }

.ldi-status-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  text-transform: uppercase;
}

.ldi-green  { background: #e6f9ed; border-color: #2d7a2d; color: #1e5e1e; }
.ldi-yellow { background: #fff8e1; border-color: var(--amber); color: #7a5800; }
.ldi-red    { background: #fdf0ec; border-color: var(--coral); color: #8a2e00; }

.injury-advice {
  font-size: 0.88rem;
  color: var(--slate);
  line-height: 1.5;
  padding: 10px 12px;
  background: var(--bg);
  border-radius: 7px;
  border-left: 3px solid var(--amber);
}

/* ============================================================
   PROGRESSIVE LOAD TAB
   ============================================================ */

.chart-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.chart-controls-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.metric-btn {
  padding: 7px 16px;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  background: var(--white);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.metric-btn:hover  { border-color: var(--earth); color: var(--earth); }
.metric-btn.active { border-color: var(--earth); background: var(--earth); color: var(--white); }

/* Threshold row — appears when HR / Pace / Power zones are active */
.threshold-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.threshold-mode-btns {
  display: flex;
}

.threshold-mode-btn {
  padding: 5px 14px;
  border: 1.5px solid var(--border);
  background: var(--white);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.threshold-mode-btn:first-child { border-radius: 20px 0 0 20px; }
.threshold-mode-btn:last-child  { border-radius: 0 20px 20px 0; border-left: none; }
.threshold-mode-btn.active      { border-color: var(--earth); background: var(--earth); color: var(--white); }

.threshold-control {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 220px;
}

.threshold-label {
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
}

.threshold-slider {
  flex: 1;
  accent-color: var(--slate);
  cursor: pointer;
  height: 4px;
}

.threshold-cut-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--slate);
  white-space: nowrap;
  min-width: 70px;
}

.ftp-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.ftp-row.hidden { display: none; }
.ftp-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}
.ftp-input {
  width: 72px;
  padding: 5px 10px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--slate);
  background: var(--white);
  text-align: center;
}
.ftp-input:focus { outline: none; border-color: #6a1b9a; }
.ftp-unit {
  font-size: 0.85rem;
  color: var(--muted);
}
.ftp-saved {
  font-size: 0.8rem;
  color: #6a1b9a;
  font-style: italic;
}
.ftp-saved.hidden { display: none; }

.hr-sync-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 20px;
  margin-bottom: 8px;
  width: fit-content;
}
.hr-sync-status.hidden { display: none; }
.hr-sync-status.processing {
  background: rgba(181, 203, 216, 0.25);
  color: var(--muted);
  border: 1px solid var(--border);
}
.hr-sync-status.done {
  background: rgba(70, 176, 56, 0.12);
  color: #2a7a1f;
  border: 1px solid rgba(70, 176, 56, 0.3);
}

.hr-sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  animation: hr-pulse 1.1s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes hr-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.3; transform: scale(0.7); }
}

.chart-area {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.chart-area .chart-container {
  flex: 1;
  min-width: 0;
}

.chart-legend-side {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex-shrink: 0;
}

.chart-legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  color: var(--slate);
  white-space: nowrap;
}

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

.chart-container {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  position: relative;
  min-height: 280px;
}

.summary-filter-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin-bottom: 10px;
}

.summary-filter-btn {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.summary-filter-btn.active,
.summary-filter-btn:hover {
  background: var(--earth);
  border-color: var(--earth);
  color: var(--white);
}

.week-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.summary-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.summary-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.summary-value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--earth);
}

/* ============================================================
   TRAINING PLAN TAB
   ============================================================ */

.subtab-bar {
  display: flex;
  gap: 4px;
  background: var(--white);
  border-radius: var(--radius);
  padding: 4px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.subtab-btn {
  flex: 1;
  padding: 9px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  cursor: pointer;
  transition: all 0.15s;
}

.subtab-btn.active { background: var(--earth); color: var(--white); }

.calendar-hint {
  font-size: 0.83rem;
  color: var(--muted);
  margin-bottom: 4px;
}

/* Calendar grid: 7 column layout */
.calendar-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.week-header {
  display: grid;
  grid-template-columns: 60px repeat(7, 1fr);
  gap: 3px;
}

.week-day-label {
  text-align: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  padding: 4px 0;
}

.week-row {
  display: grid;
  grid-template-columns: 60px repeat(7, 1fr);
  gap: 3px;
  align-items: start;
}

.week-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--muted);
  padding: 6px 2px;
  text-align: right;
  padding-right: 6px;
  line-height: 1.3;
  padding-top: 8px;
}

.day-cell {
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  border-radius: 7px;
  padding: 5px 4px;
  min-height: 56px;
  position: relative;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.day-cell.today {
  border-color: var(--earth);
  background: #fffbf2;
}

.day-cell.has-data {
  border-left: 3px solid var(--earth);
}

.day-cell.past {
  opacity: 0.7;
}

.day-cell.clickable {
  cursor: pointer;
}

.day-cell.clickable:hover {
  border-color: var(--earth);
  box-shadow: 0 2px 8px rgba(181, 116, 0, 0.15);
}

.day-num {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  display: block;
  margin-bottom: 2px;
}

.day-cell.today .day-num { color: var(--earth); }

.day-data {
  font-size: 0.65rem;
  color: var(--slate);
  line-height: 1.5;
}

.day-data-row {
  display: flex;
  align-items: center;
  gap: 2px;
}

.day-data-icon {
  font-size: 0.6rem;
  color: var(--earth);
}

/* ============================================================
   MODAL
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(44, 58, 68, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 16px;
}

.modal-card {
  background: var(--white);
  border-radius: 14px;
  width: 100%;
  max-width: 360px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--slate);
  color: var(--white);
}

.modal-header h3 {
  font-size: 1rem;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  color: var(--sky);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
  padding: 0 2px;
}

#day-form {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.modal-actions .btn { flex: 1; }

/* ============================================================
   TOAST
   ============================================================ */

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--slate);
  color: var(--white);
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  z-index: 300;
  pointer-events: none;
  transition: opacity 0.25s;
}

.toast.success { background: #2d7a2d; }
.toast.error   { background: #8a2e00; }

/* ============================================================
   UTILITIES
   ============================================================ */

.muted  { color: var(--muted); font-size: 0.88rem; }
.center { text-align: center; }

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 480px) {
  .app-header { padding: 0 10px; gap: 8px; }
  .brand-small { min-width: 80px; font-size: 0.88rem; }
  .tab-btn { font-size: 0.7rem; padding: 7px 4px; }
  .tab-panel { padding: 10px; }
  .week-summary { grid-template-columns: 1fr; }
  .checkbox-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; }
}