:root {
    --bg: #FAFAF9; --bg-card: #FFFFFF; --bg-elevated: #F5F5F4; --border: #E7E5E4;
    --text: #1C1917; --text-secondary: #78716C; --text-muted: #A8A29E;
    --accent: #10B981; --accent-rgb: 16,185,129; --warm: #F59E0B; --warm-rgb: 245,158,11;
  }
  .dark {
    --bg: #0C0A09; --bg-card: #1C1917; --bg-elevated: #292524; --border: #3D3835;
    --text: #FAFAF9; --text-secondary: #A8A29E; --text-muted: #78716C;
    --accent: #34D399; --accent-rgb: 52,211,153; --warm: #FBBF24; --warm-rgb: 251,191,36;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body { font-family: 'DM Sans', sans-serif; background: var(--bg); color: var(--text); transition: background 0.4s, color 0.4s; overflow-x: hidden; }
  .font-display { font-family: 'Plus Jakarta Sans', sans-serif; }
  .card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; transition: all 0.3s; }
  .card:hover { box-shadow: 0 8px 32px rgba(0,0,0,0.08); }
  .dark .card:hover { box-shadow: 0 8px 32px rgba(0,0,0,0.3); }
  .btn-primary { background: var(--accent); color: #fff; border: none; border-radius: 12px; padding: 10px 20px; font-weight: 600; cursor: pointer; transition: all 0.25s; font-family: 'DM Sans'; }
  .btn-primary:hover { filter: brightness(1.1); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(var(--accent-rgb),0.35); }
  .btn-primary:active { transform: translateY(0); }
  .btn-ghost { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); border-radius: 12px; padding: 10px 20px; font-weight: 500; cursor: pointer; transition: all 0.25s; font-family: 'DM Sans'; }
  .btn-ghost:hover { background: var(--bg-elevated); color: var(--text); border-color: var(--text-muted); }
  input, select { background: var(--bg-elevated); border: 1px solid var(--border); color: var(--text); border-radius: 10px; padding: 10px 14px; font-family: 'DM Sans'; font-size: 14px; outline: none; transition: border-color 0.2s; width: 100%; }
  input:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(var(--accent-rgb),0.12); }
  select option { background: var(--bg-card); color: var(--text); }
  .habit-check { width: 22px; height: 22px; border-radius: 6px; border: 2px solid var(--border); cursor: pointer; transition: all 0.25s; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
  .habit-check.checked { background: var(--accent); border-color: var(--accent); animation: checkPop 0.3s ease; }
  .habit-check.checked i { color: #fff; font-size: 11px; }
  @keyframes checkPop { 0% { transform: scale(1); } 50% { transform: scale(1.25); } 100% { transform: scale(1); } }
  .nav-tab { padding: 8px 18px; border-radius: 10px; font-weight: 500; font-size: 14px; cursor: pointer; transition: all 0.25s; color: var(--text-secondary); border: none; background: none; font-family: 'DM Sans'; white-space: nowrap; }
  .nav-tab.active { background: rgba(var(--accent-rgb),0.12); color: var(--accent); font-weight: 600; }
  .nav-tab:hover:not(.active) { color: var(--text); background: var(--bg-elevated); }
  .heatmap-cell { width: 14px; height: 14px; border-radius: 3px; transition: all 0.2s; }
  .heatmap-cell:hover { transform: scale(1.6); z-index: 10; }
  .modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); backdrop-filter: blur(4px); z-index: 100; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
  .modal-overlay.show { opacity: 1; pointer-events: all; }
  .modal-content { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; padding: 32px; max-width: 480px; width: 90%; transform: translateY(20px) scale(0.95); transition: transform 0.3s; max-height: 90vh; overflow-y: auto; }
  .modal-overlay.show .modal-content { transform: translateY(0) scale(1); }
  .toast { position: fixed; bottom: 24px; right: 24px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 14px 22px; box-shadow: 0 12px 40px rgba(0,0,0,0.15); z-index: 200; transform: translateY(100px); opacity: 0; transition: all 0.4s cubic-bezier(0.34,1.56,0.64,1); display: flex; align-items: center; gap: 10px; font-size: 14px; }
  .toast.show { transform: translateY(0); opacity: 1; }
  .stat-card { position: relative; overflow: hidden; }
  .stat-card::before { content: ''; position: absolute; top: -20px; right: -20px; width: 80px; height: 80px; border-radius: 50%; background: rgba(var(--accent-rgb),0.08); }
  .fade-in { animation: fadeIn 0.5s ease forwards; }
  @keyframes fadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
  .stagger-1 { animation-delay: 0.05s; opacity: 0; }
  .stagger-2 { animation-delay: 0.1s; opacity: 0; }
  .stagger-3 { animation-delay: 0.15s; opacity: 0; }
  .stagger-4 { animation-delay: 0.2s; opacity: 0; }
  .stagger-5 { animation-delay: 0.25s; opacity: 0; }
  @keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
  .quote-float { animation: float 6s ease-in-out infinite; }
  .calendar-day { transition: all 0.2s; }
  .calendar-day:hover { background: var(--bg-elevated) !important; }
  .category-badge { font-size: 11px; padding: 2px 8px; border-radius: 6px; font-weight: 600; letter-spacing: 0.3px; }
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
  ::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
  .bg-gradient-mesh {
    background: radial-gradient(ellipse at 20% 50%, rgba(var(--accent-rgb),0.06) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(var(--warm-rgb),0.04) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 80%, rgba(var(--accent-rgb),0.03) 0%, transparent 50%);
  }
  .dark .bg-gradient-mesh {
    background: radial-gradient(ellipse at 20% 50%, rgba(var(--accent-rgb),0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(var(--warm-rgb),0.05) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 80%, rgba(var(--accent-rgb),0.04) 0%, transparent 50%);
  }
  @media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }
  @media (max-width: 768px) {
    .modal-content { padding: 24px; border-radius: 16px; }
    .nav-tab { padding: 6px 12px; font-size: 13px; }
  }