:root {
      --bg-1: #0b1020;
      --bg-2: #111a33;
      --bg-3: #0d1328;
      --card: rgba(255, 255, 255, 0.08);
      --card-border: rgba(255, 255, 255, 0.18);
      --text: #e9eefc;
      --muted: #aeb7d6;
      --primary: #60a5fa;
      --primary-hover: #3b82f6;
      --success: #34d399;
      --warning: #fbbf24;
      --danger: #f87171;
      --shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
      --radius-xl: 20px;
      --radius-lg: 14px;
      --radius-md: 10px;
      --transition: 220ms ease;
      --scroll-track: #0b1530;
      --scroll-thumb: #2563eb;
      --scroll-thumb-hover: #3b82f6;
    }

    * {
      box-sizing: border-box;
      scrollbar-width: thin;
      scrollbar-color: var(--scroll-thumb) var(--scroll-track);
    }

    *::-webkit-scrollbar {
      width: 10px;
      height: 10px;
    }

    *::-webkit-scrollbar-track {
      background: var(--scroll-track);
      border-radius: 999px;
    }

    *::-webkit-scrollbar-thumb {
      background: linear-gradient(180deg, var(--scroll-thumb), var(--scroll-thumb-hover));
      border-radius: 999px;
      border: 2px solid var(--scroll-track);
    }

    *::-webkit-scrollbar-thumb:hover {
      background: linear-gradient(180deg, #60a5fa, var(--scroll-thumb-hover));
    }

    html,
    body {
      margin: 0;
      padding: 0;
      min-height: 100%;
      scroll-behavior: smooth;
      font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 10% 10%, rgba(96, 165, 250, 0.16), transparent 34%),
        radial-gradient(circle at 90% 0%, rgba(52, 211, 153, 0.12), transparent 28%),
        linear-gradient(135deg, var(--bg-1), var(--bg-2), var(--bg-3));
      background-attachment: fixed;
    }

    body {
      padding: 24px;
      display: grid;
      place-items: center;
    }

    .app-shell {
      width: min(920px, 100%);
    }

    .section {
      display: none;
      position: relative;
    }

    .section.active {
      display: block;
      animation: fadeIn 0.4s ease;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* Landing Page */
    .landing {
      padding: 40px 20px;
    }

    .landing-content {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      gap: 18px;
    }

    .landing-image {
      width: min(100%, 640px);
      height: auto;
      border-radius: var(--radius-xl);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow);
      background: rgba(255, 255, 255, 0.04);
      padding: 8px;
    }

    .logo {
      font-size: clamp(42px, 6vw, 56px);
      font-weight: 800;
      margin: 0 0 16px;
      letter-spacing: -0.02em;
      background: linear-gradient(135deg, #60a5fa, #34d399);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .tagline {
      font-size: clamp(16px, 2.5vw, 20px);
      color: var(--muted);
      margin: 0;
      line-height: 1.6;
      max-width: 560px;
    }

    .btn {
      border: 0;
      padding: 14px 32px;
      font-weight: 700;
      color: #061225;
      background: linear-gradient(135deg, #7dd3fc, var(--primary));
      cursor: pointer;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 18px rgba(59, 130, 246, 0.35);
      font-size: 16px;
      font-family: inherit;
      transition: transform var(--transition), box-shadow var(--transition);
    }

    .btn:hover:not(:disabled) {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(59, 130, 246, 0.45);
    }

    .btn:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none;
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.1);
      color: var(--text);
      box-shadow: none;
      border: 1px solid var(--card-border);
    }

    /* Panel/Card Styles */
    .panel {
      background: var(--card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-xl);
      padding: clamp(20px, 3vw, 32px);
      box-shadow: var(--shadow);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      margin-bottom: 20px;
    }

    .panel-title {
      font-size: 18px;
      margin: 0 0 16px;
      color: #c6d0ef;
      font-weight: 600;
    }

    /* File Upload */
    .file-upload {
      border: 2px dashed var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
      cursor: pointer;
      transition: border-color var(--transition), background var(--transition);
    }

    .file-upload:hover {
      border-color: var(--primary);
      background: rgba(96, 165, 250, 0.05);
    }

    .file-upload input[type="file"] {
      display: none;
    }

    .file-name {
      margin-top: 12px;
      color: var(--success);
      font-weight: 600;
    }

    .resume-analysis {
      margin-top: 16px;
      background: rgba(10, 16, 34, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 16px;
    }

    .resume-analysis-title {
      margin: 0 0 10px;
      font-size: 15px;
      color: var(--primary);
    }

    .resume-analysis-text {
      margin: 0;
      color: #c6d0ef;
      white-space: pre-wrap;
      font-family: inherit;
      line-height: 1.6;
      font-size: 14px;
    }

    /* Role Selection */
    .custom-dropdown {
      position: relative;
    }

    .dropdown-trigger {
      width: 100%;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.16);
      outline: none;
      font: inherit;
      color: var(--text);
      background: rgba(17, 24, 39, 0.72);
      padding: 12px 40px 12px 14px;
      text-align: left;
      cursor: pointer;
      transition: border-color var(--transition), box-shadow var(--transition);
      position: relative;
    }

    .dropdown-trigger::after {
      content: "";
      position: absolute;
      right: 14px;
      top: 50%;
      width: 8px;
      height: 8px;
      border-right: 2px solid #cbd5e1;
      border-bottom: 2px solid #cbd5e1;
      transform: translateY(-65%) rotate(45deg);
      transition: transform var(--transition);
    }

    .custom-dropdown.open .dropdown-trigger {
      border-color: rgba(96, 165, 250, 0.9);
      box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.2);
    }

    .custom-dropdown.open .dropdown-trigger::after {
      transform: translateY(-35%) rotate(-135deg);
    }

    .dropdown-menu {
      position: absolute;
      top: calc(100% + 8px);
      left: 0;
      right: 0;
      z-index: 40;
      display: none;
      max-height: 220px;
      overflow: auto;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.18);
      background: rgba(10, 16, 34, 0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 14px 28px rgba(0, 0, 0, 0.42);
      padding: 6px;
    }

    .custom-dropdown.open .dropdown-menu {
      display: block;
    }

    .dropdown-option {
      width: 100%;
      text-align: left;
      color: var(--text);
      background: transparent;
      border: 0;
      border-radius: 8px;
      padding: 10px;
      cursor: pointer;
      font-size: 14px;
      font-family: inherit;
    }

    .dropdown-option:hover {
      background: rgba(96, 165, 250, 0.2);
    }

    label {
      display: block;
      font-size: 13px;
      margin: 0 0 8px;
      color: #bfcaea;
      font-weight: 600;
    }

    select, textarea {
      width: 100%;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.16);
      outline: none;
      font: inherit;
      color: var(--text);
      background: rgba(17, 24, 39, 0.72);
      padding: 12px 14px;
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    select:focus, textarea:focus {
      border-color: rgba(96, 165, 250, 0.9);
      box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.2);
    }

    textarea {
      resize: vertical;
      min-height: 140px;
      line-height: 1.6;
    }

    .grid {
      display: grid;
      grid-template-columns: 1fr 180px;
      gap: 12px;
      margin-bottom: 16px;
    }

    /* Question Display */
    .question-card {
      background: rgba(10, 16, 34, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 20px;
      margin-bottom: 20px;
      min-height: 100px;
      line-height: 1.7;
    }

    .question-number {
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 8px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .question-text {
      font-size: 17px;
      color: #dde5ff;
    }

    /* Feedback Section */
    .feedback-grid {
      display: grid;
      gap: 16px;
    }

    .score-card {
      background: linear-gradient(135deg, rgba(96, 165, 250, 0.15), rgba(52, 211, 153, 0.15));
      border: 1px solid rgba(96, 165, 250, 0.3);
      border-radius: var(--radius-lg);
      padding: 24px;
      text-align: center;
    }

    .score-value {
      font-size: 48px;
      font-weight: 800;
      color: var(--success);
      margin: 0;
    }

    .score-label {
      color: var(--muted);
      font-size: 14px;
      margin-top: 4px;
    }

    .feedback-section {
      background: rgba(10, 16, 34, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 20px;
    }

    .feedback-section h4 {
      margin: 0 0 12px;
      color: var(--primary);
      font-size: 15px;
    }

    .feedback-section ul {
      margin: 0;
      padding-left: 20px;
      line-height: 1.7;
    }

    .feedback-section p {
      margin: 0;
      line-height: 1.7;
      color: #c6d0ef;
    }

    /* Progress Tracker */
    .progress-bar-container {
      background: rgba(10, 16, 34, 0.75);
      border-radius: var(--radius-lg);
      height: 14px;
      overflow: hidden;
      margin: 12px 0;
    }

    .progress-bar {
      height: 100%;
      background: linear-gradient(90deg, var(--primary), var(--success));
      border-radius: var(--radius-lg);
      transition: width 0.5s ease;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
      gap: 12px;
      margin-top: 16px;
    }

    .stat-item {
      text-align: center;
      padding: 16px;
      background: rgba(10, 16, 34, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
    }

    .stat-value {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
      display: block;
    }

    .stat-label {
      font-size: 12px;
      color: var(--muted);
      margin-top: 4px;
    }

    .button-group {
      display: flex;
      gap: 12px;
      margin-top: 16px;
    }

    .button-group .btn {
      flex: 1;
    }

    .loading {
      min-height: 20px;
      margin-top: 12px;
      color: var(--warning);
      font-size: 14px;
      display: none;
      align-items: center;
      gap: 10px;
    }

    .loading.show {
      display: inline-flex;
    }

    .dot-loader {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: currentColor;
      animation: pulse-dots 1.1s infinite ease-in-out;
    }

    @keyframes pulse-dots {
      0%, 100% { box-shadow: 10px 0 0 -2px currentColor, 20px 0 0 -2px currentColor; }
      50% { box-shadow: 10px 0 0 0 currentColor, 20px 0 0 -2px currentColor; }
    }

    /* Back Arrow Button */
    .back-arrow {
      position: absolute;
      top: 24px;
      left: 24px;
      width: 44px;
      height: 44px;
      border: 1px solid var(--card-border);
      background: var(--card);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 50%;
      color: var(--primary);
      font-size: 20px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
      font-family: inherit;
      z-index: 10;
    }

    .back-arrow:hover {
      background: rgba(96, 165, 250, 0.15);
      border-color: var(--primary);
      transform: translateX(-3px);
      box-shadow: 0 6px 16px rgba(96, 165, 250, 0.3);
    }

    /* Summary Page Styles */
    .summary-header {
      display: flex;
      gap: 12px;
      margin-bottom: 20px;
      flex-wrap: wrap;
    }

    .role-badge, .difficulty-badge {
      padding: 8px 16px;
      border-radius: var(--radius-md);
      font-size: 14px;
      font-weight: 600;
      background: rgba(10, 16, 34, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.12);
      color: var(--primary);
    }

    .difficulty-badge {
      color: var(--warning);
    }

    .score-badge {
      display: inline-block;
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 700;
      background: rgba(96, 165, 250, 0.15);
      border: 1px solid rgba(96, 165, 250, 0.3);
      color: var(--primary);
      min-width: 50px;
      text-align: center;
    }

    @media (max-width: 760px) {
      .landing {
        padding: 24px 8px;
      }

      .landing-content {
        gap: 14px;
      }

      .landing-image {
        width: min(100%, 420px);
      }

      .grid {
        grid-template-columns: 1fr;
      }
      .button-group {
        flex-direction: column;
      }
      .back-arrow {
        top: 12px;
        left: 12px;
        width: 40px;
        height: 40px;
        font-size: 18px;
      }
    }