/* ==============================
   GLOBAL & HOMEPAGE
   ============================== */
   * { margin: 0; padding: 0; box-sizing: border-box; }

   body {
     font-family: 'Roboto Mono', monospace;
     background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
     color: #e2e8f0;
     height: 100vh;
     overflow: hidden;
   }
   
   /* Homepage */
   .container {
     max-width: 600px;
     margin: 0 auto;
     padding: 2rem;
     text-align: center;
     height: 100vh;
     display: flex;
     flex-direction: column;
     justify-content: center;
   }
   
   .title {
     font-family: 'Orbitron', sans-serif;
     font-size: 4rem;
     background: linear-gradient(90deg, #3b82f6, #8b5cf6);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
     margin-bottom: 0.5rem;
   }
   
   .pro { color: #60a5fa; }
   
   .tagline {
     color: #94a3b8;
     margin-bottom: 3rem;
     font-size: 1.1rem;
   }
   
   .card {
     background: rgba(30, 41, 59, 0.7);
     backdrop-filter: blur(12px);
     border: 1px solid rgba(59, 130, 246, 0.3);
     border-radius: 16px;
     padding: 1.5rem;
     margin: 1rem 0;
     box-shadow: 0 8px 32px rgba(0,0,0,0.3);
     transition: all 0.3s ease;
   }
   
   .card:hover {
     transform: translateY(-5px);
     box-shadow: 0 16px 40px rgba(59, 130, 246, 0.2);
   }
   
   input {
     width: 100%;
     padding: 0.8rem;
     margin: 0.8rem 0;
     border: 1px solid #3b82f6;
     background: rgba(15, 23, 42, 0.8);
     color: #e2e8f0;
     border-radius: 8px;
     font-size: 1rem;
   }
   
   button {
     background: linear-gradient(90deg, #3b82f6, #8b5cf6);
     color: white;
     border: none;
     padding: 0.8rem 1.5rem;
     border-radius: 8px;
     cursor: pointer;
     font-weight: bold;
     transition: 0.3s;
     width: 100%;
     font-size: 1rem;
   }
   
   button:hover {
     transform: scale(1.03);
     box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
   }
   
   .or {
     color: #64748b;
     margin: 1rem 0;
     font-weight: bold;
   }
   
   .features {
     display: flex;
     justify-content: space-around;
     margin-top: 2rem;
     font-size: 0.9rem;
     color: #60a5fa;
   }
   
   /* ==============================
      ROOM LAYOUT
      ============================== */
   #main {
     display: flex;
     flex-direction: column;
     height: 100vh;
     background: #0f172a;
   }
   
   /* Toolbar */
   #toolbar {
     padding: 0.8rem 1rem;
     background: #1e293b;
     display: flex;
     align-items: center;
     gap: 1rem;
     border-bottom: 1px solid #334155;
     z-index: 10;
   }
   
   #language, #runBtn {
     padding: 0.5rem 1rem;
     border-radius: 8px;
     border: 1px solid #3b82f6;
     background: #1e40af;
     color: white;
     font-size: 0.9rem;
   }
   
   #runBtn {
     background: #10b981;
     font-weight: bold;
   }
   
   #userCount {
     margin-left: auto;
     color: #60a5fa;
     font-size: 0.9rem;
   }
   
   /* Editor */
   #editor {
     flex: 1;
     position: relative;
   }
   
   /* Output Pane */
   #output-pane {
     height: 180px;
     background: #0f172a;
     border-top: 1px solid #334155;
     display: flex;
     flex-direction: column;
   }
   
   #output-header {
     background: #1e293b;
     padding: 0.4rem 1rem;
     font-weight: bold;
     color: #60a5fa;
     font-size: 0.9rem;
   }
   
   #output {
     flex: 1;
     margin: 0;
     padding: 0.8rem;
     overflow-y: auto;
     font-family: 'Courier New', monospace;
     color: #10b981;
     white-space: pre-wrap;
     font-size: 0.95rem;
   }
   
   /* ==============================
      COMMENTS
      ============================== */
   
   /* Viewer: Floating comment box (bottom-right) */
   #viewer-comment-box {
     position: fixed;
     bottom: 20px;
     right: 20px;
     width: 300px;
     background: rgba(15,23,42,0.95);
     border: 1px solid #3b82f6;
     border-radius: 12px;
     padding: 0.8rem;
     box-shadow: 0 8px 25px rgba(0,0,0,0.4);
     display: flex;
     flex-direction: column;
     gap: 0.5rem;
     z-index: 100;
   }
   
   #viewer-comment-box textarea {
     resize: none;
     height: 70px;
     background: #1e293b;
     border: 1px solid #3b82f6;
     color: #e2e8f0;
     padding: 0.5rem;
     border-radius: 8px;
     font-size: 0.9rem;
   }
   
   #viewer-comment-box button {
     align-self: flex-end;
     width: auto;
     padding: 0.5rem 1rem;
     font-size: 0.9rem;
   }
   
   /* Author: Right sidebar comment list */
   #author-comments {
     position: fixed;
     right: 0;
     top: 0;
     width: 300px;
     height: 100vh;
     background: rgba(15,23,42,0.95);
     border-left: 1px solid #334155;
     padding: 1rem;
     overflow-y: auto;
     z-index: 50;
   }
   
   #author-comments h3 {
     margin-top: 0;
     color: #8b5cf6;
     font-size: 1.1rem;
   }
   
   #commentList .comment {
     background: #1e293b;
     padding: 0.7rem;
     border-radius: 8px;
     margin: 0.5rem 0;
     border-left: 3px solid #8b5cf6;
     font-size: 0.9rem;
     word-wrap: break-word;
   }
   
   /* Hidden class */
   .hidden { display: none !important; }
   
   /* CodeMirror theme override (optional) */
   .CodeMirror {
     height: 100% !important;
     font-size: 15px;
   }

   /* ==============================
   COMMENT REPLIES (Author)
   ============================== */
.comment {
    background: #1e293b;
    padding: 0.8rem;
    border-radius: 8px;
    margin: 0.6rem 0;
    border-left: 3px solid #8b5cf6;
  }
  
  .comment-body {
    margin-bottom: 0.5rem;
  }
  
  .reply-section {
    margin-top: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }
  
  .reply-input {
    width: 100%;
    height: 50px;
    background: #0f172a;
    border: 1px solid #3b82f6;
    color: #e2e8f0;
    padding: 0.5rem;
    border-radius: 6px;
    font-size: 0.85rem;
    resize: none;
  }
  
  .reply-btn {
    align-self: flex-end;
    background: #8b5cf6;
    color: white;
    border: none;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
  }
  
  .reply-btn:hover {
    background: #7c3aed;
  }
  
  .reply {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: #172554;
    border-radius: 6px;
    border-left: 2px solid #60a5fa;
    font-size: 0.85rem;
  }