/* HealthTracker Modern Mobile-First CSS */
:root {
  --bg-primary: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --bg-input: #0b1329;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-indigo: #6366f1;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  padding-bottom: 84px; /* Space for bottom nav */
}

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

/* Container */
.container {
  max-width: 768px;
  margin: 0 auto;
  padding: 16px;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background-color: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: #fff;
}

.brand-icon {
  font-size: 1.4rem;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-logout {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s;
}

.btn-logout:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
}

/* Alert Messages */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.alert-success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--accent-green);
  color: #34d399;
}

.alert-error {
  background: rgba(244, 63, 94, 0.15);
  border: 1px solid var(--accent-rose);
  color: #fb7185;
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-bottom: 16px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Grid & Layouts */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

.stat-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.stat-val {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
}

.stat-sub {
  font-size: 0.8rem;
  color: var(--accent-green);
  margin-top: 2px;
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.95rem;
  transition: border-color 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
  width: 100%;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: var(--bg-card-hover);
  color: var(--text-main);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
}

/* Chip Selector for Mobile */
.chips-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.chip-btn {
  padding: 8px 14px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.chip-btn.active, .chip-btn:hover {
  border-color: var(--primary);
  color: #fff;
  background: rgba(14, 165, 233, 0.2);
}

/* Micro Survey 1-5 Scale */
.rating-scale {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-top: 6px;
}

.rating-btn {
  flex: 1;
  padding: 10px 0;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
}

.rating-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 0 10px rgba(14, 165, 233, 0.5);
}

/* Bottom Navigation Bar for Mobile */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 68px;
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 100;
  max-width: 768px;
  margin: 0 auto;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.72rem;
  text-decoration: none;
  gap: 3px;
  flex: 1;
  padding: 8px 0;
  transition: color 0.2s;
}

.nav-item.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-icon {
  font-size: 1.3rem;
}

/* Timeline & Feed List */
.feed-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.feed-item:last-child {
  border-bottom: none;
}

.feed-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.feed-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tag-badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.72rem;
  background: rgba(14, 165, 233, 0.15);
  border: 1px solid rgba(14, 165, 233, 0.4);
  color: #38bdf8;
  border-radius: 12px;
  margin-right: 4px;
  margin-top: 4px;
}

/* Code Snippet */
pre code {
  display: block;
  padding: 12px;
  background: #090d16;
  border-radius: var(--radius-md);
  font-family: monospace;
  font-size: 0.82rem;
  color: #38bdf8;
  overflow-x: auto;
  margin: 8px 0;
}