/* ============================================================
   TRACKIT — style.css (Premium Flat Monochrome HIG Style)
   Apple & Google Minimalist Design Language
   No Gradients · No Emojis · Clear Typography · Soft Shadows
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── Typography & Base Defaults ──────────────────────────── */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  letter-spacing: -0.015em;
  -webkit-font-smoothing: antialiased;
  background-color: var(--bs-body-bg);
  color: var(--bs-body-color);
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* ── Minimalist Solid Colors & Semantic Themes ───────────── */
:root {
  --trackit-accent: #0071e3; /* Apple System Blue */
  --trackit-accent-light: rgba(0, 113, 227, 0.08);
  --nav-height: 64px;
  --bottom-nav-h: 68px;
  
  /* System Backgrounds (Light Mode Neutral) */
  --bs-body-bg: #f5f5f7;
  --bs-body-color: #1d1d1f;
  --bs-secondary-bg: #ffffff;
  --bs-tertiary-bg: #e8e8ed;
  --bs-border-color: rgba(0, 0, 0, 0.08);
}

[data-bs-theme="dark"] {
  /* System Backgrounds (Dark Mode True Black) */
  --bs-body-bg: #000000;
  --bs-body-color: #f5f5f7;
  --bs-secondary-bg: #121212;
  --bs-tertiary-bg: #1c1c1e;
  --bs-border-color: rgba(255, 255, 255, 0.08);
}

/* ── Saturated Minimal Header (Flat Design) ───────────────── */
.navbar-trackit {
  height: var(--nav-height);
  background: var(--bs-secondary-bg) !important;
  border-bottom: 1px solid var(--bs-border-color) !important;
  padding: 0 20px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.02) !important;
}

.bottom-nav {
  height: var(--bottom-nav-h);
  background: var(--bs-secondary-bg) !important;
  border-top: 1px solid var(--bs-border-color) !important;
  padding: 4px 8px;
  justify-content: space-around;
  align-items: center;
  box-shadow: 0 -1px 2px rgba(0,0,0,0.02) !important;
}

/* ── Navigation Buttons ──────────────────────────────────── */
.bottom-nav-btn {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  border: none; background: none;
  color: #86868b; /* Apple Subtitle Gray */
  font-size: 10px; font-weight: 500;
  padding: 6px 12px; border-radius: 12px; flex: 1;
  transition: color 0.15s, background-color 0.15s;
}
.bottom-nav-btn i { font-size: 19px; transition: transform 0.15s; }
.bottom-nav-btn.active { color: var(--trackit-accent); font-weight: 600; }
.bottom-nav-btn.active i { transform: scale(1.05); }
.bottom-nav-btn:hover { background-color: rgba(0, 0, 0, 0.02); }
[data-bs-theme="dark"] .bottom-nav-btn:hover { background-color: rgba(255, 255, 255, 0.03); }

.desktop-nav-link {
  border: none; background: none;
  padding: 6px 14px; border-radius: 10px;
  font-size: 13px; font-weight: 500;
  color: #86868b;
  transition: color 0.15s, background-color 0.15s;
}
.desktop-nav-link:hover { background-color: rgba(0, 0, 0, 0.03); color: var(--bs-body-color); }
[data-bs-theme="dark"] .desktop-nav-link:hover { background-color: rgba(255, 255, 255, 0.04); }
.desktop-nav-link.active { color: var(--trackit-accent); font-weight: 600; }

/* ── Content Shell ───────────────────────────────────────── */
.main-content {
  padding-top: calc(var(--nav-height) + 16px);
  min-height: 100dvh;
  padding-bottom: calc(var(--bottom-nav-h) + 24px);
}
@media (min-width: 768px) {
  .main-content { padding-bottom: 40px; }
}

.page-enter { animation: appleEnter 0.2s cubic-bezier(0.16, 1, 0.3, 1) both; }
@keyframes appleEnter {
  from { opacity: 0; transform: scale(0.99) translateY(4px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

/* ── Apple Squircle Cards (Flat & Soft Shadows) ───────────── */
.card, .leaderboard-item, .streak-item, .recent-tracker-item {
  border-radius: 14px !important;
  border: 1px solid var(--bs-border-color) !important;
  background-color: var(--bs-secondary-bg) !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02) !important;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.tracker-card:hover, .streak-item:hover, .recent-tracker-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05) !important;
}
[data-bs-theme="dark"] .card, 
[data-bs-theme="dark"] .leaderboard-item, 
[data-bs-theme="dark"] .streak-item, 
[data-bs-theme="dark"] .recent-tracker-item {
  border: 1px solid rgba(255, 255, 255, 0.07) !important;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25) !important;
}
[data-bs-theme="dark"] .tracker-card:hover, 
[data-bs-theme="dark"] .streak-item:hover, 
[data-bs-theme="dark"] .recent-tracker-item:hover {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4) !important;
}

.tracker-card { border-top-width: 4px !important; }

/* ── Minimalist Input & Form Styling ────────────────────── */
.form-control, .form-select {
  border-radius: 10px;
  padding: 9px 13px;
  background-color: var(--bs-tertiary-bg);
  border: 1px solid transparent;
  color: var(--bs-body-color);
  transition: border-color 0.15s, background-color 0.15s;
}
.form-control:focus, .form-select:focus {
  border-color: var(--trackit-accent);
  background-color: var(--bs-secondary-bg);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

.template-card {
  border-radius: 12px !important;
  background-color: var(--bs-tertiary-bg) !important;
  border: 1px solid transparent !important;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s, transform 0.15s;
}
.template-card:hover, .template-card.selected {
  border-color: var(--trackit-accent) !important;
  background-color: var(--trackit-accent-light) !important;
}
.template-card.selected { transform: scale(1.01); }

/* ── Opaque, High-Thickness Heatmap Grids ────────────────── */
.heatmap-grid {
  display: grid;
  grid-template-columns: repeat(18, 1fr);
  gap: 5px;
  min-width: 270px;
}
.heatmap-cell {
  aspect-ratio: 1;
  border-radius: 3px;
  transition: transform 0.1s;
  cursor: default;
  border: 1px solid transparent !important;
}
.heatmap-cell:hover { transform: scale(1.2); }

/* Solid, High-Contrast Palette */
.heatmap-cell.lv0 { background-color: var(--bs-tertiary-bg); }
.heatmap-cell.lv1 { background-color: rgba(0, 113, 227, 0.15); }
.heatmap-cell.lv2 { background-color: rgba(0, 113, 227, 0.4); }
.heatmap-cell.lv3 { background-color: rgba(0, 113, 227, 0.75); }
.heatmap-cell.lv4 { background-color: #0071e3; }

/* ── Calendar CSS Grid ───────────────────── */
.cal-grid {
  display: grid !important;
  grid-template-columns: repeat(7, 1fr) !important;
  gap: 0px !important;
  width: 100% !important;
  border-left: 1px solid var(--bs-border-color);
  border-top: 1px solid var(--bs-border-color);
}

.cal-day-header {
  font-size: 11px;
  font-weight: 700;
  color: #86868b;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 8px 0;
  border-right: 1px solid var(--bs-border-color);
  border-bottom: 1px solid var(--bs-border-color);
  background-color: var(--bs-tertiary-bg);
}

.cal-cell {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start !important;
  justify-content: space-between;
  padding: 8px;
  border-radius: 0px !important;
  cursor: pointer;
  background-color: var(--bs-secondary-bg);
  border-right: 1px solid var(--bs-border-color) !important;
  border-bottom: 1px solid var(--bs-border-color) !important;
  transition: background-color 0.15s, border-color 0.15s;
}
.cal-cell:hover:not(.cal-empty) { background-color: var(--bs-tertiary-bg); }
.cal-cell.cal-today {
  background-color: var(--trackit-accent-light) !important;
  box-shadow: inset 0 0 0 2px var(--trackit-accent) !important;
}
.cal-empty {
  background-color: var(--bs-tertiary-bg) !important;
  cursor: default;
}

.cal-dots {
  display: flex;
  justify-content: flex-start;
  gap: 3px;
  flex-wrap: wrap;
  width: 100%;
  margin-top: auto;
}

.cal-cube {
  width: 15px;
  height: 15px;
  border-radius: 3px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  color: #ffffff;
  line-height: 1;
  font-weight: bold;
}

/* Dark Mode Calendar Tile contrast enhancements */
[data-bs-theme="dark"] .cal-grid {
  border-color: rgba(255,255,255,0.15) !important;
}
[data-bs-theme="dark"] .cal-day-header,
[data-bs-theme="dark"] .cal-cell {
  border-color: rgba(255,255,255,0.15) !important;
}
[data-bs-theme="dark"] .cal-empty {
  background-color: #0d0d0d !important;
}

/* Calendar Responsiveness (320px - 619px Viewport size constraints) */
@media (max-width: 619px) {
  .cal-cell {
    padding: 3px !important;
    min-height: 42px !important;
  }
  .cal-cell span {
    font-size: 10px !important;
  }
  .cal-cube {
    width: 11px !important;
    height: 11px !important;
    font-size: 6px !important;
    border-radius: 2px !important;
  }
  .cal-dots {
    gap: 1.5px !important;
    margin-top: 1px !important;
  }
}

/* ── Buttons, Badges & Toggles ───────────────────────────── */
.btn-primary {
  background-color: var(--trackit-accent);
  border-color: var(--trackit-accent);
  border-radius: 10px;
  font-weight: 600;
  padding: 9px 18px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04) !important;
  transition: opacity 0.15s, transform 0.1s;
}
.btn-primary:hover { opacity: 0.92; background-color: var(--trackit-accent); border-color: var(--trackit-accent); }
.btn-primary:active { transform: scale(0.98); }

.btn-secondary {
  background-color: var(--bs-tertiary-bg);
  border-color: transparent;
  color: var(--bs-body-color);
  border-radius: 10px;
  font-weight: 500;
  padding: 9px 18px;
}
.btn-secondary:hover { background-color: var(--bs-secondary-bg); border-color: var(--bs-border-color); color: var(--bs-body-color); }

.btn-outline-secondary {
  border-radius: 10px;
  border-color: var(--bs-border-color);
  color: #86868b;
}
.btn-outline-secondary:hover { background-color: var(--bs-tertiary-bg); color: var(--bs-body-color); border-color: var(--bs-border-color); }

.check-circle-btn {
  width: 26px;
  height: 26px;
  border-radius: 50% !important;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 !important;
  transition: transform 0.15s, background-color 0.15s;
}
.check-circle-btn:active { transform: scale(0.9); }

.stat-num {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 2.2rem;
  letter-spacing: -0.03em;
  color: var(--bs-body-color);
}

/* ── Frosted Modal Card ──────────────────────────────────── */
.modal-content {
  border-radius: 18px !important;
  background-color: var(--bs-secondary-bg) !important;
  border: 1px solid var(--bs-border-color) !important;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15) !important;
}

/* ── Tracker Selection Cards in Quick Add ────────────────── */
.tracker-select-card {
  padding: 10px 16px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid var(--bs-border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  font-weight: 500;
  user-select: none;
}
[data-bs-theme="dark"] .tracker-select-card {
  background: rgba(255, 255, 255, 0.02);
}
.tracker-select-card:hover {
  background: rgba(0, 0, 0, 0.04);
  transform: translateY(-1px);
}
[data-bs-theme="dark"] .tracker-select-card:hover {
  background: rgba(255, 255, 255, 0.04);
}
.tracker-select-card.selected {
  background: var(--trackit-accent-light);
  border-color: var(--trackit-accent);
}

/* ── Specialized Workout & Tracker UI ────────────────────── */
.exercise-row, .topic-input-row, .subtopic-input-row {
  border-bottom: 1px solid var(--bs-border-color);
  padding-bottom: 12px;
}
.exercise-row:last-child, .topic-input-row:last-child {
  border-bottom: none;
}

.photo-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 8px;
}

.photo-thumbnail-container {
  position: relative;
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--bs-border-color);
  background: var(--bs-tertiary-bg);
  cursor: pointer;
}
.photo-thumbnail-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.2s;
}
.photo-thumbnail-container img:hover {
  transform: scale(1.05);
}

.photo-remove-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(0,0,0,0.6);
  color: white;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  cursor: pointer;
}

.nested-checklist {
  padding-left: 24px;
  border-left: 2px solid var(--bs-border-color);
}

.mood-card {
  flex: 1;
  text-align: center;
  padding: 12px 6px;
  border-radius: 10px;
  border: 1px solid var(--bs-border-color);
  background: var(--bs-secondary-bg);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.15s;
}
.mood-card:hover {
  background: var(--bs-tertiary-bg);
}
.mood-card.active {
  background: var(--trackit-accent-light);
  border-color: var(--trackit-accent);
  color: var(--trackit-accent);
}

/* ── Lightbox Styles ─────────────────────────────────────── */
.lightbox-modal {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.9);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}
.lightbox-modal img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.lightbox-close {
  position: absolute;
  top: 20px; right: 20px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: white;
  border: none;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ── PWA Installation Banner ─────────────────────────────── */
.pwa-banner {
  position: fixed;
  bottom: calc(var(--bottom-nav-h) + 12px);
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 24px);
  max-width: 480px;
  background: var(--bs-secondary-bg);
  border: 1px solid var(--trackit-accent);
  border-radius: 12px;
  padding: 12px 16px;
  z-index: 1050;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
@media (min-width: 768px) {
  .pwa-banner {
    bottom: 24px;
  }
}

/* ── Scrollbars ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bs-tertiary-bg); border-radius: 4px; }