/* ============================================
   Micro-Habit Streak Tracker — Styles
   Theme: Wellness dark mode, Green/Gold
   ============================================ */

:root {
  --primary: #2ECC71;
  --primary-dim: rgba(46, 204, 113, 0.15);
  --secondary: #27AE60;
  --accent: #F39C12;
  --accent-dim: rgba(243, 156, 18, 0.15);
  --bg: #0F0F1A;
  --bg-card: rgba(15, 15, 26, 0.65);
  --bg-surface: #16162A;
  --border: rgba(46, 204, 113, 0.12);
  --text: #E8F5EC;
  --text-dim: #5B7A65;
  --danger: #E74C3C;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 250ms ease;
  --font: 'Inter', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font); background: var(--bg); color: var(--text);
  line-height: 1.6; min-height: 100vh; -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(ellipse at 30% 0%, rgba(46,204,113,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 100%, rgba(243,156,18,0.03) 0%, transparent 50%);
}

.glass-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); padding: 1.25rem;
}

.header { padding: 1.25rem; text-align: center; border-bottom: 1px solid var(--border); }
.header-inner { max-width: 720px; margin: 0 auto; }
.logo { display: flex; align-items: center; justify-content: center; gap: 0.75rem; }
.logo-icon { font-size: 1.75rem; }
.logo h1 {
  font-size: 1.4rem; font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.tagline { color: var(--text-dim); font-size: 0.85rem; }

.main { max-width: 720px; margin: 0 auto; padding: 1.5rem; display: flex; flex-direction: column; gap: 1.25rem; }
.section-title { font-size: 1rem; font-weight: 600; color: var(--primary); margin-bottom: 0.5rem; }

/* Quote */
.quote-banner { text-align: center; padding: 0.75rem; }
.quote-text { font-style: italic; color: var(--text-dim); font-size: 0.85rem; }

/* Today */
.today-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.75rem; }
.habit-list { display: flex; flex-direction: column; gap: 0.5rem; }
.habit-item {
  display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  transition: all var(--transition); cursor: pointer;
}
.habit-item:hover { border-color: var(--primary); }
.habit-item.done { border-color: var(--primary); background: var(--primary-dim); }
.habit-check {
  width: 28px; height: 28px; border: 2px solid var(--border); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 0.9rem;
  transition: all var(--transition); flex-shrink: 0;
}
.habit-item.done .habit-check { background: var(--primary); border-color: var(--primary); }
.habit-icon { font-size: 1.3rem; }
.habit-info { flex: 1; }
.habit-name { font-weight: 600; font-size: 0.9rem; }
.habit-streak { font-size: 0.72rem; color: var(--accent); font-weight: 700; }
.habit-delete { background: none; border: none; color: var(--text-dim); font-size: 0.9rem; cursor: pointer; padding: 0.3rem; opacity: 0; transition: opacity var(--transition); }
.habit-item:hover .habit-delete { opacity: 1; }
.empty-state { color: var(--text-dim); text-align: center; font-size: 0.9rem; padding: 2rem; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.75rem; }
.stat-card { text-align: center; padding: 0.75rem; }
.stat-number { display: block; font-size: 1.5rem; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 0.72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; }

/* Heatmap */
.heatmap-container { display: flex; flex-wrap: wrap; gap: 3px; }
.heatmap-cell { width: 14px; height: 14px; border-radius: 3px; background: var(--bg-surface); transition: background var(--transition); }
.heatmap-cell.level-1 { background: rgba(46, 204, 113, 0.2); }
.heatmap-cell.level-2 { background: rgba(46, 204, 113, 0.4); }
.heatmap-cell.level-3 { background: rgba(46, 204, 113, 0.65); }
.heatmap-cell.level-4 { background: var(--primary); }
.heatmap-legend { display: flex; align-items: center; gap: 4px; margin-top: 0.5rem; justify-content: flex-end; }
.legend-label { font-size: 0.65rem; color: var(--text-dim); }
.legend-box { width: 12px; height: 12px; border-radius: 2px; }
.level-0 { background: var(--bg-surface); }
.level-1 { background: rgba(46, 204, 113, 0.2); }
.level-2 { background: rgba(46, 204, 113, 0.4); }
.level-3 { background: rgba(46, 204, 113, 0.65); }
.level-4 { background: var(--primary); }

/* Modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex;
  align-items: center; justify-content: center; z-index: 100;
}
.modal { width: 90%; max-width: 400px; }
.modal-title { font-size: 1.1rem; font-weight: 700; color: var(--primary); margin-bottom: 1rem; }
.control-group { margin-bottom: 0.75rem; }
.control-label { display: block; font-size: 0.78rem; font-weight: 600; color: var(--text-dim); margin-bottom: 0.25rem; text-transform: uppercase; letter-spacing: 0.5px; }
.control-input {
  width: 100%; padding: 0.5rem 0.7rem; background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-family: var(--font); font-size: 0.85rem;
}
.control-input:focus { outline: none; border-color: var(--primary); }
select.control-input { appearance: none; cursor: pointer; }
.icon-grid { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.icon-btn {
  width: 36px; height: 36px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: transparent; font-size: 1.1rem; cursor: pointer; transition: all var(--transition);
}
.icon-btn.active { border-color: var(--primary); background: var(--primary-dim); }
.modal-actions { display: flex; gap: 0.5rem; margin-top: 1rem; }

/* Celebration */
.celebration {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.75); z-index: 200;
}
.celebration-content { text-align: center; animation: celebPop 600ms ease; }
.celebration-icon { font-size: 4rem; display: block; }
.celebration-text { font-size: 1.5rem; font-weight: 800; color: var(--accent); margin-top: 0.5rem; display: block; }
@keyframes celebPop {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); opacity: 1; }
}

/* Data actions */
.data-actions { display: flex; gap: 0.5rem; justify-content: center; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.55rem 1rem; border: none;
  border-radius: var(--radius-sm); font-family: var(--font); font-size: 0.85rem; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(46,204,113,0.35); }
.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.78rem; }

.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%) translateY(100px);
  background: var(--primary); color: #fff; padding: 0.75rem 1.5rem; border-radius: var(--radius);
  font-size: 0.9rem; font-weight: 600; z-index: 1000; transition: transform 300ms ease;
}
.toast.show { transform: translateX(-50%) translateY(0); }

.footer { text-align: center; padding: 1.25rem; color: var(--text-dim); font-size: 0.8rem; border-top: 1px solid var(--border); }

@media (max-width: 600px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }