:root {
      --bg-dark: #07090e;
      --card-bg: rgba(18, 24, 38, 0.75);
      --card-border: rgba(255, 255, 255, 0.08);
      --accent-cyan: #38bdf8;
      --accent-indigo: #6366f1;
      --text-main: #f8fafc;
      --text-sub: #94a3b8;
      
      --safe-color: #10b981;
      --safe-bg: rgba(16, 185, 129, 0.12);
      --safe-border: rgba(16, 185, 129, 0.3);
      
      --danger-color: #f43f5e;
      --danger-bg: rgba(244, 63, 94, 0.12);
      --danger-border: rgba(244, 63, 94, 0.3);

      --neutral-color: #f59e0b;
      --neutral-bg: rgba(245, 158, 11, 0.12);
    }

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

    body {
      background-color: var(--bg-dark);
      background-image: 
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.12) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(99, 102, 241, 0.12) 0px, transparent 50%);
      color: var(--text-main);
      font-family: 'Plus Jakarta Sans', sans-serif;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 1.5rem 1rem;
    }

    /* Container setup */
    .app-shell {
      width: 100%;
      max-width: 960px;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    /* Header */
    header {
      text-align: center;
      padding: 1.5rem 0 0.5rem;
    }

    .brand-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background: rgba(56, 189, 248, 0.08);
      border: 1px solid rgba(56, 189, 248, 0.2);
      color: var(--accent-cyan);
      padding: 0.35rem 0.85rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      margin-bottom: 1rem;
    }

    .brand-badge .pulse {
      width: 6px;
      height: 6px;
      background-color: var(--accent-cyan);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent-cyan);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(1.3); }
    }

    header h1 {
      font-size: clamp(1.8rem, 4vw, 2.75rem);
      font-weight: 800;
      letter-spacing: -0.03em;
      background: linear-gradient(135deg, #ffffff 30%, var(--text-sub) 100%);
      background-clip: border-box;
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 0.5rem;
    }

    header p {
      color: var(--text-sub);
      font-size: clamp(0.9rem, 2vw, 1.05rem);
      max-width: 580px;
      margin: 0 auto;
    }

    /* Glass Cards */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: 20px;
      padding: 1.5rem;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }

    @media (min-width: 640px) {
      .glass-card { padding: 2rem; }
    }

    /* Tabs */
    .tabs-nav {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.5rem;
      background: rgba(0, 0, 0, 0.3);
      padding: 0.35rem;
      border-radius: 12px;
      margin-bottom: 1.5rem;
    }

    .tab-btn {
      background: transparent;
      border: none;
      color: var(--text-sub);
      font-family: inherit;
      font-size: 0.875rem;
      font-weight: 600;
      padding: 0.75rem 0.5rem;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.2s ease;
      text-align: center;
    }

    .tab-btn.active {
      background: rgba(255, 255, 255, 0.08);
      color: var(--text-main);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    }

    /* Input Controls */
    .tab-pane { display: none; }
    .tab-pane.active { display: block; }

    .input-group {
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
    }

    @media (min-width: 640px) {
      .input-group {
        flex-direction: row;
      }
    }

    .input-field {
      flex: 1;
      background: rgba(7, 9, 14, 0.6);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      padding: 0.9rem 1.25rem;
      color: var(--text-main);
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.9rem;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
    }

    .input-field:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
    }

    /* Info Callout Box */
    .info-callout {
      background: rgba(56, 189, 248, 0.08);
      border: 1px solid rgba(56, 189, 248, 0.25);
      padding: 1rem 1.25rem;
      border-radius: 12px;
      margin-bottom: 1.25rem;
    }

    .info-callout-header {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--accent-cyan);
      font-weight: 700;
      font-size: 0.85rem;
      margin-bottom: 0.4rem;
    }

    .info-callout-text {
      color: var(--text-sub);
      font-size: 0.8rem;
      line-height: 1.4;
    }

    .info-callout-code {
      background: rgba(0, 0, 0, 0.4);
      padding: 0.5rem 0.75rem;
      border-radius: 6px;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.725rem;
      color: var(--text-main);
      margin-top: 0.5rem;
      word-break: break-all;
    }

    /* Dropzone */
    .dropzone {
      border: 2px dashed var(--card-border);
      border-radius: 14px;
      padding: 2.5rem 1rem;
      text-align: center;
      background: rgba(7, 9, 14, 0.3);
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .dropzone:hover {
      border-color: var(--accent-cyan);
      background: rgba(56, 189, 248, 0.03);
    }

    .dropzone-icon {
      font-size: 2rem;
      margin-bottom: 0.5rem;
      display: block;
    }

    /* Action Button */
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
      color: #fff;
      border: none;
      border-radius: 12px;
      padding: 0.9rem 1.75rem;
      font-family: inherit;
      font-weight: 700;
      font-size: 0.95rem;
      cursor: pointer;
      transition: transform 0.15s ease, opacity 0.2s ease, box-shadow 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      white-space: nowrap;
    }

    .btn-primary:hover {
      opacity: 0.95;
      box-shadow: 0 10px 20px -5px rgba(56, 189, 248, 0.3);
      transform: translateY(-1px);
    }

    .btn-primary:active { transform: translateY(0); }

    /* Loading Spinner */
    .loader-container {
      display: none;
      text-align: center;
      padding: 2rem 0;
    }

    .spinner {
      width: 36px;
      height: 36px;
      border: 3px solid rgba(255, 255, 255, 0.1);
      border-top-color: var(--accent-cyan);
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
      margin: 0 auto 1rem;
    }

    @keyframes spin { to { transform: rotate(360deg); } }

    .loader-text {
      color: var(--text-sub);
      font-size: 0.9rem;
      font-weight: 500;
    }

    /* Results Dashboard */
    .results-wrapper { display: none; margin-top: 1.5rem; }

    .result-banner {
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
      padding: 1.25rem 1.5rem;
      border-radius: 14px;
      margin-bottom: 1.5rem;
    }

    @media (min-width: 640px) {
      .result-banner {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
      }
    }

    .result-banner.safe {
      background: var(--safe-bg);
      border: 1px solid var(--safe-border);
      color: var(--safe-color);
    }

    .result-banner.danger {
      background: var(--danger-bg);
      border: 1px solid var(--danger-border);
      color: var(--danger-color);
    }

    .result-title {
      font-size: 1.1rem;
      font-weight: 800;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .result-score {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.85rem;
      font-weight: 700;
      padding: 0.3rem 0.75rem;
      border-radius: 8px;
      background: rgba(0, 0, 0, 0.25);
      align-self: flex-start;
    }

    /* Feature Grid / Vector Map */
    .section-title {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-sub);
      margin-bottom: 1rem;
    }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 0.75rem;
    }

    .feature-card {
      background: rgba(7, 9, 14, 0.5);
      border: 1px solid var(--card-border);
      padding: 0.75rem 1rem;
      border-radius: 10px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.825rem;
    }

    .feature-name {
      color: var(--text-sub);
      font-family: 'JetBrains Mono', monospace;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      max-width: 170px;
    }

    .feature-badge {
      font-family: 'JetBrains Mono', monospace;
      font-weight: 700;
      padding: 0.2rem 0.5rem;
      border-radius: 6px;
      font-size: 0.75rem;
    }

    .feature-badge.val-1 { background: var(--safe-bg); color: var(--safe-color); }
    .feature-badge.val-0 { background: var(--neutral-bg); color: var(--neutral-color); }
    .feature-badge.val--1 { background: var(--danger-bg); color: var(--danger-color); }

    /* Responsive Data Table for CSV */
    .table-container {
      width: 100%;
      overflow-x: auto;
      border: 1px solid var(--card-border);
      border-radius: 12px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.875rem;
    }

    th, td {
      padding: 0.85rem 1.25rem;
      border-bottom: 1px solid var(--card-border);
    }

    th {
      background: rgba(0, 0, 0, 0.4);
      color: var(--text-sub);
      font-weight: 600;
      font-size: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    td { font-family: 'JetBrains Mono', monospace; }

    .status-pill {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      padding: 0.25rem 0.65rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 700;
    }

    .status-pill.safe { background: var(--safe-bg); color: var(--safe-color); }
    .status-pill.danger { background: var(--danger-bg); color: var(--danger-color); }