:root {
      --gray-50:  #fafafa;
      --slate-100: #f1f5f9;
      --gray-100: #f3f4f6;
      --gray-200: #e5e7eb;
      --gray-500: #6b7280;
      --gray-600: #4b5563;
      --gray-700: #374151;

      --indigo-100: #e0e7ff;
      --indigo-500: #6366f1;
      --indigo-900: #1e3a8a;
      --purple-600: #8b5cf6;
      --indigo-400-text: #60a5fa;

      --amber-50:   #fffbeb;
      --amber-400:  #f59e0b;
      --emerald-50: #ecfdf5;
      --emerald-400:#34d399;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html, body {
      width: 100%;
      height: 100%;
      overflow-x: hidden; 
      overflow-y: auto;   
      font-family: Arial, sans-serif;
      background: linear-gradient(to bottom right, var(--gray-50), var(--slate-100));
    }


    .top-bar {
      /* Full width, horizontally center the content */
      width: 90%;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1rem 0;
    }

    /* TITLE: centered left side */
    .title {
      font-size: 1.6rem;
      font-weight: bold;
      background: linear-gradient(to right, var(--indigo-500), var(--purple-600));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      position:relative;
      top: 1.25rem;
      right: 1rem;
    }
    
    .title::after {
      content: "Mechanical Engineering 24/25 Plan";
    }

    .legend-bubble {

      position: absolute; 
      top: 1.6rem; 
      right: 1rem;
      z-index: 50;
      
      display: flex;
      align-items: center;
      gap: 1rem;
      background-color: rgba(255,255,255,0.9);
      backdrop-filter: blur(6px);

      border: 1px solid var(--gray-200);
      border-radius: 9999px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.06);

      padding: 0.75rem 1.5rem;
    }
    .legend-text {
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--gray-600);
    }
    .legend-colors {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .legend-item {
      display: flex;
      align-items: center;
      gap: 0.25rem;
      font-size: 0.875rem;
      color: var(--gray-600);
    }
    .legend-dot {
      width: 0.75rem;
      height: 0.75rem;
      border-radius: 9999px;
    }
    .dot-amber   { background-color: var(--amber-400); }
    .dot-emerald { background-color: var(--emerald-400); }

    .year-grid {
      width: 90%;
      margin: 0 auto;
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 1.5rem;
      padding-bottom: 2rem; 
      padding-top: 2rem;
    }
    /* or 1200 test then */
    @media (max-width: 950px) {
      .year-grid {
        grid-template-columns: repeat(2, minmax(0,1fr));
      }
    }
    /* or 640 test then */
    @media (max-width: 450px) {
      .year-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 800px) {
      .title::after {
        content: "ME 24/25 Plan";
      }
    }
    
    
    @media (max-width: 600px) {
      .title::after {
        content: "ME Plan";
      }
    }
    
    @media (max-width: 510px) {
      .title::after {
        content: "ME";
      }
      .legend-bubble {
        right: 0rem;
        width: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
      }
    }
    
    @media (max-width: 415px) {
      .title {
        opacity: 0%;
      }
      .legend-bubble {
        right: 0rem;
      }
      .legend-text {
      font-size: 0.8rem;
      }
      .legend-dot {
        height: 0.5rem;
        width: 0.5rem;
      }
      
      .legend-item {
        font-size: 0.8rem;
      }
    }
    

    /* y block styling */
    .year-block {
      background-color: rgba(255,255,255,0.7);
      backdrop-filter: blur(4px);
      border: 1px solid var(--gray-200);
      border-radius: 0.75rem;
      box-shadow: 0 4px 8px rgba(0,0,0,0.05);
      padding: 1rem;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }
    .year-title {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--gray-700);
      margin-bottom: 0.5rem;
      text-align: center;
    }

    /* Terms stacked */
    .term {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }
    .term-title {
      font-size: 1rem;
      font-weight: 600;
      color: var(--gray-600);
      margin-bottom: 0.25rem;
      margin-top: 0.25rem;
    }

    /* 1 column per course */
    .course-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 0.5rem;
    }

    .course-card {
      position: relative;
      border-radius: 0.5rem;
      border: 1px solid var(--gray-100);
      box-shadow: 0 2px 4px rgba(0,0,0,0.05);
      padding: 0.75rem;
      transition: box-shadow 0.3s, transform 0.3s;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 5.5rem; 
      cursor: pointer;
    }
    .course-card:hover {
      box-shadow: 0 6px 10px rgba(0,0,0,0.07);
      transform: translateY(-2px);
    }
    .course-code {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--indigo-900);
      margin-bottom: 4px;
    }
    .course-name {
      font-size: 0.8rem;
      color: var(--gray-600);
      max-width: 120px; 
      overflow-wrap: break-word;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }
    .course-credits {
      position: absolute;
      bottom: 6px;
      right: 8px;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--indigo-400-text);
    }

    /* hovering */
    .bg-indigo-100  { background-color: var(--indigo-100) !important; }
    .ring-2-indigo  { box-shadow: 0 0 0 2px var(--indigo-500) !important; }
    .bg-amber-50    { background-color: var(--amber-50) !important; }
    .ring-2-amber   { box-shadow: 0 0 0 2px var(--amber-400) !important; }
    .bg-emerald-50  { background-color: var(--emerald-50) !important; }
    .ring-2-emerald { box-shadow: 0 0 0 2px var(--emerald-400) !important; }