:root {
      --primary: #6B7280;
      --primary-dark: #4B5563;
      --accent: #6B7280;
      --bg-main: #E5E7EB;
      --bg-card: #F3F4F6;
      --text-main: #1F2937;
      --text-muted: #6B7280;
      --border: #D1D5DB;
      --error: #EF4444;
      --success: #10B981;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-soft: 0 2px 10px rgba(0, 0, 0, 0.08);
    }

    body.dark-mode {
      --primary: #9CA3AF;
      --primary-dark: #6B7280;
      --accent: #9CA3AF;
      --bg-main: #1a1a1a;
      --bg-card: #2d2d2d;
      --text-main: #e4e4e4;
      --text-muted: #a0a0a0;
      --border: #404040;
      --error: #ff6b7a;
      --success: #4ade80;
      --shadow-soft: 0 2px 10px rgba(0, 0, 0, 0.5);
    }

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

    body {
      min-height: 100vh;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 30px 20px;
      line-height: 1.6;
    }

    .shell {
      width: 100%;
      max-width: 1400px;
      margin: 0 auto;
    }

    .card {
      background: var(--bg-card);
      border-radius: 12px;
      box-shadow: var(--shadow-soft);
      overflow: hidden;
    }

    header {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      padding: 40px 50px 30px;
      text-align: center;
    }


    header h1 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .subtitle {
      font-size: 1.05rem;
      opacity: 0.95;
      font-weight: 300;
    }


    .layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr);
      gap: 30px;
      padding: 40px 50px;
    }

    .layout.has-output {
      grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    }

    @media (max-width: 1000px) {
      .layout,
      .layout.has-output {
        grid-template-columns: minmax(0, 1fr);
      }
    }

    form {
      display: grid;
      gap: 18px;
    }

    .section {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 20px;
      border: 1px solid var(--border);
    }

    .section-header {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .section-title .icon {
      width: 26px;
      height: 26px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.85rem;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: white;
      font-weight: 600;
    }

    .section-hint {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .required {
      color: var(--error);
      font-weight: bold;
    }

    label {
      display: block;
      font-size: 0.9rem;
      font-weight: 500;
      margin-bottom: 6px;
      margin-top: 10px;
      color: var(--text-main);
    }

    label:first-of-type {
      margin-top: 0;
    }

    .input,
    textarea,
    select {
      width: 100%;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      background: var(--bg-card);
      color: var(--text-main);
      padding: 9px 12px;
      font-size: 0.95rem;
      font-family: inherit;
      outline: none;
      transition: border-color 0.3s, box-shadow 0.3s;
      resize: vertical;
    }

    textarea {
      min-height: 80px;
    }

    select {
      cursor: pointer;
      appearance: none;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236B7280' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 12px center;
      padding-right: 36px;
    }

    .input:focus,
    textarea:focus,
    select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(107, 114, 128, 0.15);
    }

    .checkbox-group {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
      gap: 8px;
      margin-top: 8px;
    }

    .checkbox-label {
      display: flex;
      align-items: center;
      font-weight: 400;
      cursor: pointer;
      padding: 8px 10px;
      border-radius: var(--radius-md);
      transition: background-color 0.2s;
      border: 1px solid transparent;
    }

    .checkbox-label:hover {
      background-color: #E5E7EB;
      border-color: #D1D5DB;
    }

.checkbox-label input[type="checkbox"] {
  width: 17px;
  height: 17px;
  margin-right: 10px;
  cursor: pointer;
  accent-color: var(--primary);
}

.checkbox-label input[type="radio"] {
  width: 17px;
  height: 17px;
  margin-right: 10px;
  cursor: pointer;
  accent-color: var(--primary);
}

.context-priority {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.context-priority.is-hidden {
  display: none;
}

.context-priority-label.is-hidden {
  display: none;
}

.context-priority .checkbox-label {
  flex: 1 1 320px;
  align-items: center;
  min-height: 48px;
}

.context-priority .checkbox-label input[type="radio"] {
  margin-top: 0;
}

.sound-natural-label {
  margin-top: 12px;
  background: #E5E7EB;
  border: 1px solid #D1D5DB;
}

.sound-natural-wrap.is-hidden {
  display: none;
}

    .actions {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      align-items: center;
      margin-top: 6px;
    }

    .actions.output-actions button {
      min-width: 170px;
      text-align: center;
    }

    .actions.output-actions .copy-toast {
      flex-basis: 100%;
    }

    button {
      border-radius: 8px;
      border: none;
      padding: 12px 28px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      font-family: inherit;
      transition: all 0.3s;
    }

    button[type="submit"] {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(107, 114, 128, 0.25);
    }

    button[type="submit"]:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(107, 114, 128, 0.35);
    }

    button[type="submit"]:active {
      transform: translateY(0);
    }

    .button-secondary {
      background-color: var(--bg-card);
      color: var(--text-muted);
      border: 2px solid var(--border);
    }

    .button-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #E5E7EB;
    }

    .button-chatgpt {
      background-color: #10A37F;
      color: #ffffff;
      border: 2px solid #10A37F;
    }

    .button-chatgpt:hover {
      background-color: #0E8C6E;
      border-color: #0E8C6E;
      color: #ffffff;
    }

    .button-claude {
      background-color: #F59E0B;
      color: #ffffff;
      border: 2px solid #F59E0B;
    }

    .button-claude:hover {
      background-color: #D97706;
      border-color: #D97706;
      color: #ffffff;
    }

    .button-gemini {
      background-color: #4285F4;
      color: #ffffff;
      border: 2px solid #4285F4;
    }

    .button-gemini:hover {
      background-color: #2563EB;
      border-color: #2563EB;
      color: #ffffff;
    }

    .button-grok {
      background-color: #111111;
      color: #ffffff;
      border: 2px solid #111111;
    }

    .button-grok:hover {
      background-color: #000000;
      border-color: #000000;
      color: #ffffff;
    }

    .button-danger {
      background-color: var(--bg-card);
      color: #dc3545;
      border: 2px solid #dc3545;
    }

    .button-danger:hover {
      background-color: #dc3545;
      color: #ffffff;
    }

    .preset-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 20px;
      padding: 16px;
      background: #E5E7EB;
      border-radius: var(--radius-lg);
      border: 1px solid #D1D5DB;
      justify-content: center;
    }

    .preset-buttons-label {
      width: 100%;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .button-preset {
      background-color: var(--bg-card);
      color: var(--primary);
      border: 2px solid var(--primary);
      padding: 8px 16px;
      font-size: 0.85rem;
    }

    .button-preset:hover {
      background-color: var(--primary);
      color: #ffffff;
    }

    .reset-all-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 50px 0;
    }

    .mode-toggle {
      display: flex;
      justify-content: center;
      gap: 10px;
      padding: 0 16px;
      margin-bottom: -12px;
      position: relative;
      z-index: 2;
    }

    .mode-toggle-button {
      background-color: #F9FAFB;
      color: var(--text-muted);
      border: 1px solid #D1D5DB;
      border-bottom: none;
      position: relative;
      padding: 8px 20px;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      border-radius: 12px 12px 0 0;
      cursor: pointer;
      transition: all 0.2s;
      box-shadow: 0 -6px 16px rgba(0, 0, 0, 0.08);
    }

    .mode-toggle-button.is-active {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      border-color: transparent;
      box-shadow: 0 -10px 20px rgba(75, 85, 99, 0.4);
      transform: translateY(-4px);
    }

    .mode-toggle-button.is-active::after {
      content: '';
      position: absolute;
      left: 12px;
      right: 12px;
      bottom: -6px;
      height: 6px;
      background: #E5E7EB;
      border-radius: 0 0 8px 8px;
    }

    body[data-mode="personal"] [data-mode="business"],
    body[data-mode="personal"] [data-mode="research"],
    body[data-mode="business"] [data-mode="personal"],
    body[data-mode="business"] [data-mode="research"],
    body[data-mode="research"] [data-mode="personal"],
    body[data-mode="research"] [data-mode="business"] {
      display: none !important;
    }

    .dark-mode-toggle {
      background-color: var(--bg-card);
      color: var(--text-main);
      border: 2px solid var(--border);
      padding: 10px 20px;
      border-radius: 8px;
      cursor: pointer;
      font-size: 0.9rem;
      font-weight: 600;
      transition: all 0.3s;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .dark-mode-toggle:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    body.dark-mode .section {
      background: #252525;
    }

    body.dark-mode .output-card {
      background: #252525;
    }

    body.dark-mode .preset-buttons {
      background: #252525;
      border-color: #404040;
    }

    body.dark-mode .button-preset {
      background-color: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    body.dark-mode .button-preset:hover {
      background-color: #ffffff;
      color: var(--primary);
      border-color: #ffffff;
    }

    body.dark-mode .sound-natural-label {
      background: #374151 !important;
      border-color: var(--primary) !important;
      color: #ffffff;
    }

    body.dark-mode .warning-box {
      background-color: #3a3000;
      border-color: #665500;
      color: #ffd966;
    }

    body.dark-mode .output-container {
      background-color: #1f1f1f;
    }

    body.dark-mode select {
      background-color: var(--bg-card);
      color: var(--text-main);
    }

    body.dark-mode .checkbox-label:hover {
      background-color: #374151;
      border-color: #4B5563;
    }

    .output-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 20px;
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      gap: 14px;
      height: fit-content;
      position: sticky;
      top: 20px;
    }

    .output-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding-bottom: 12px;
      border-bottom: 2px solid var(--primary);
    }

    .output-header-title {
      font-size: 1.15rem;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .output-meta {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .output-container {
      background-color: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 16px;
      max-height: 700px;
      overflow-y: auto;
    }

    #generatedPrompt {
      white-space: pre-wrap;
      word-wrap: break-word;
      font-family: 'Courier New', Courier, monospace;
      font-size: 0.85rem;
      line-height: 1.6;
      color: var(--text-main);
    }

    .copy-toast {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 18px 28px;
      min-height: 60px;
      background-color: var(--success);
      color: #ffffff;
      border-radius: 10px;
      font-size: 1.05rem;
      font-weight: 600;
      text-align: center;
      position: fixed;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 9999;
      box-shadow: 0 18px 40px rgba(0, 0, 0, 0.2);
      max-width: min(520px, 88vw);
      line-height: 1.4;
    }

    .copy-toast.is-warning {
      background-color: #F59E0B;
      color: #ffffff;
    }

    .error-text {
      font-size: 0.85rem;
      color: var(--error);
      font-weight: 500;
    }

    .warning-box {
      background-color: #FEF3C7;
      border: 1px solid #F59E0B;
      border-radius: var(--radius-md);
      padding: 14px 16px;
      margin-bottom: 14px;
      font-size: 0.9rem;
      line-height: 1.5;
      color: #92400E;
    }

    .warning-box strong {
      display: block;
      margin-bottom: 6px;
      font-weight: 600;
    }

    @media (max-width: 768px) {
      body {
        padding: 15px;
      }

      .shell {
        width: 95%;
      }

      header {
        padding: 30px 25px 20px;
      }

      header h1 {
        font-size: 1.6rem;
      }

      .subtitle {
        font-size: 0.95rem;
      }

      .reset-all-container {
        padding: 16px 25px 0;
        flex-direction: column;
        gap: 10px;
      }

      .reset-all-container button {
        width: 100%;
      }

      .layout {
        padding: 25px;
      }

      .section {
        padding: 16px;
      }

      .checkbox-group {
        grid-template-columns: 1fr;
      }

      .output-card {
        position: static;
        padding: 16px;
      }

      .preset-buttons {
        padding: 12px;
      }

      .button-preset {
        font-size: 0.8rem;
        padding: 6px 12px;
      }
    }

    @media (max-width: 480px) {
      header h1 {
        font-size: 1.4rem;
      }

      .section-title {
        font-size: 1rem;
      }
    }