:root {
    --primary: #5a67d8;
    --secondary: #fbbf24;
    --background: #f0f4f8;
    --card-bg: #ffffff;
    --dark-bg: #1e1e2f;
    --dark-card: #2e2e3e;
    --light-red: #ffe5e5;
    --light-yellow: #fff8e5;
    --light-green: #e5ffe5;
  }
  
  /* Body */
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background: var(--background);
    color: #222;
    transition: background 0.3s, color 0.3s;
  }
  
  /* Header */
  header {
    background: linear-gradient(90deg, #5a67d8, #7f9cf5);
    color: white;
    text-align: center;
    padding: 25px 0;
    font-size: 2.2rem;
    font-weight: bold;
    letter-spacing: 1px;
    text-shadow: 1px 1px 2px #00000050;
    position: relative;
  }
  
  /* Theme Toggle */
  #theme-toggle {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    color: var(--primary);
    border-radius: 50%;
    border: none;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  #theme-toggle:hover {
    transform: translateY(-50%) rotate(360deg);
    box-shadow: 0 0 10px var(--primary);
  }
  
  /* Tabs */
  .tabs {
    display: flex;
    justify-content: center;
    margin: 20px 0;
    flex-wrap: wrap;
  }
  .tab-btn {
    padding: 12px 25px;
    margin: 0 5px;
    border: none;
    border-radius: 8px;
    background: #ddd;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
  }
  .tab-btn.active {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
  }
  
  /* Tab content */
  .tab-content {
    display: none;
    padding: 20px;
    max-width: 900px;
    margin: auto;
    transition: background 0.3s ease, color 0.3s ease;
  }
  .tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease-in;
  }
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px);}
    to { opacity: 1; transform: translateY(0);}
  }
  
  /* Task Input */
  #task-input {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    animation: slideDown 0.5s ease;
  }
  #task-input input,
  #task-input select,
  #task-input button {
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 1rem;
    transition: all 0.3s;
  }
  #task-input input:focus,
  #task-input select:focus {
    border-color: var(--primary);
    outline: 2px solid var(--secondary);
    outline-offset: 2px;
  }
  #task-input button {
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
  }
  #task-input button:hover {
    background: #434190;
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-20px);}
    to { opacity: 1; transform: translateY(0);}
  }
  
  /* Task Controls */
  #task-controls {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
  }
  #task-controls input,
  #task-controls select {
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 1rem;
  }
  
  /* Task List */
  #tasks { list-style: none; padding: 0; }
  .task {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    margin: 10px 0;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  .task:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0,0,0,0.2);
  }
  .task.completed {
    text-decoration: line-through;
    opacity: 0.6;
    animation: popFade 0.4s ease;
  }
  @keyframes popFade {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
    100% { transform: scale(1); opacity: 0.6; }
  }
  
  /* Date coloring */
  .task.near { background: var(--light-red); }
  .task.medium { background: var(--light-yellow); }
  .task.fresh { background: var(--light-green); }
  
  /* Task Buttons */
  .task button {
    border: none;
    background: none;
    cursor: pointer;
    margin-left: 10px;
    font-size: 1.2rem;
    color: var(--primary);
  }
  
  /* Mini Calendar */
  #mini-calendar {
    margin-top: 30px;
    text-align: center;
  }
  #calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
    margin-top: 10px;
  }
  .calendar-day {
    padding: 10px;
    border-radius: 5px;
    background: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: 0.3s;
  }
  .calendar-day.has-task {
    background: #5a67d8;
    color: white;
    font-weight: bold;
  }
  .calendar-day:hover {
    transform: scale(1.05);
  }
  
  /* Progress & Analytics */
  #progress progress {
    width: 100%;
    height: 25px;
    border-radius: 12px;
  }
  #analytics canvas {
    margin-top: 20px;
    max-width: 100%;
    background: #fefefe;
    padding: 15px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
  }
  #analytics canvas:hover {
    transform: scale(1.03);
  }
  
  /* Suggestions & Points */
  #suggestions {
    background: #f0fff4;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
    animation: fadeIn 0.5s ease;
  }
  #points-level {
    background: linear-gradient(135deg, #5a67d8, #7f9cf5);
    color: white;
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
  }
  #points-level:hover {
    transform: translateY(-5px);
  }
  
  /* Greeting */
  #greeting {
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: bold;
  }
  
  /* Dark Mode */
  .dark {
    background: var(--dark-bg);
    color: #eee;
  }
  .dark section {
    background: var(--dark-card);
    color: #eee;
  }
  .dark #suggestions,
  .dark #points-level {
    background: #2a2a3a;
  }
  .dark .task {
    background: #2e2e3e;
    color: #eee;
  }
  .dark .task button {
    color: var(--secondary);
  }
  .dark #calendar-grid .calendar-day {
    background: #444;
    color: #eee;
  }
  .dark #calendar-grid .calendar-day:hover {
    background: #555;
  }
  .dark .calendar-day.has-task {
    background: var(--secondary);
    color: #111;
    font-weight: bold;
    border: 2px solid #fff;
  }
  
  /* Responsive Layout */
@media (max-width: 600px) {
    #task-input,
    #task-controls {
      flex-direction: column;
      align-items: stretch;
    }
  
    .tab-btn {
      width: 100%;
      margin: 5px 0;
    }
  
    .task {
      flex-direction: column;
      align-items: flex-start;
      gap: 10px;
    }
  
    .task span {
      display: block;
      width: 100%;
    }
  
    .task div {
      display: flex;
      justify-content: flex-end;
      width: 100%;
    }
  
    #calendar-grid {
      grid-template-columns: repeat(4, 1fr);
    }
  
    #analytics canvas {
      padding: 10px;
    }
  
    #points-level {
      font-size: 1rem;
      padding: 20px;
    }
  
    #suggestions {
      font-size: 0.95rem;
    }
  }