:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --danger: #dc2626;
      --danger-hover: #b91c1c;
      --success: #059669;
      --warning: #d97706;
      --bg: #f9fafb;
      --card-bg: #ffffff;
      --text: #111827;
      --text-secondary: #6b7280;
      --border: #e5e7eb;
      --border-light: #f3f4f6;
      --shadow: 0 1px 2px rgba(0,0,0,0.05);
      --shadow-lg: 0 4px 6px -1px rgba(0,0,0,0.1);
      --accent-blue: #eff6ff;
      --accent-green: #f0fdf4;
      --accent-border-blue: #dbeafe;
      --accent-border-green: #dcfce7;
      /* Additional accent colors */
      --accent-warning: #fefce8;
      --accent-border-warning: #fef08a;
      --text-warning: #92400e;
      --accent-purple: #faf5ff;
      --accent-border-purple: #e9d5ff;
      --text-purple: #7c3aed;
    }

    /* Dark mode variables */
    [data-display-theme="dark"] {
      --bg: #0f172a;
      --card-bg: #1e293b;
      --text: #f1f5f9;
      --text-secondary: #94a3b8;
      --border: #334155;
      --border-light: #1e293b;
      --shadow: 0 1px 2px rgba(0,0,0,0.3);
      --shadow-lg: 0 4px 6px -1px rgba(0,0,0,0.4);
      --accent-blue: #1e3a5f;
      --accent-green: #14532d;
      --accent-border-blue: #1e40af;
      --accent-border-green: #166534;
      --danger: #ef4444;
      --danger-hover: #dc2626;
      --success: #10b981;
      --warning: #f59e0b;
      --accent-warning: #422006;
      --accent-border-warning: #854d0e;
      --text-warning: #fbbf24;
      --accent-purple: #2e1065;
      --accent-border-purple: #581c87;
      --text-purple: #c4b5fd;
    }

    /* ===== Paper Theme ===== */
    html[data-style="paper"] {
      --bg: #F6F0E7;
      --card-bg: #FFFCF7;
      --text: #2B2A26;
      --text-secondary: #6B645C;
      --primary: #2F4FA5;
      --primary-hover: #264181;
      --border: #CFC6BA;
      --accent-blue: #E8EEF9;
      --accent-green: #E6F3EA;
      --accent-border-blue: #C9D4EB;
      --accent-border-green: #C7DDCF;
      --accent-warning: #F5ECD8;
      --accent-border-warning: #E0D0AC;
      --text-warning: #8B6914;
      --accent-purple: #F0E8F5;
      --accent-border-purple: #D8C8E8;
      --text-purple: #6B4A9E;
    }
    html[data-style="paper"][data-display-theme="dark"] {
      --bg: #1F1B16;
      --card-bg: #26211B;
      --text: #F5F1E8;
      --text-secondary: #C9C1B5;
      --border: #5C5348;
      --accent-blue: #2A2520;
      --accent-green: #252A22;
      --accent-border-blue: #4A4238;
      --accent-border-green: #3A4035;
      --accent-warning: #322A1E;
      --accent-border-warning: #5C4A30;
      --text-warning: #D4A520;
      --accent-purple: #2A2430;
      --accent-border-purple: #4A3860;
      --text-purple: #B89CE0;
    }

    /* ===== Clean Theme ===== */
    html[data-style="clean"] {
      --bg: #fafafa;
      --card-bg: #ffffff;
      --text: #171717;
      --text-secondary: #525252;
      --primary: #3b82f6;
      --primary-hover: #2563eb;
      --border: #e5e5e5;
      --accent-blue: #eff6ff;
      --accent-green: #f0fdf4;
      --accent-border-blue: #bfdbfe;
      --accent-border-green: #bbf7d0;
      --accent-warning: #fefce8;
      --accent-border-warning: #fde047;
      --text-warning: #a16207;
      --accent-purple: #faf5ff;
      --accent-border-purple: #d8b4fe;
      --text-purple: #7c3aed;
    }
    html[data-style="clean"][data-display-theme="dark"] {
      --bg: #0a0a0a;
      --card-bg: #171717;
      --text: #fafafa;
      --text-secondary: #a3a3a3;
      --border: #262626;
      --accent-blue: #172554;
      --accent-green: #14532d;
      --accent-border-blue: #1e3a8a;
      --accent-border-green: #166534;
      --accent-warning: #422006;
      --accent-border-warning: #854d0e;
      --text-warning: #fbbf24;
      --accent-purple: #3b0764;
      --accent-border-purple: #581c87;
      --text-purple: #c4b5fd;
    }

    /* ===== CLI Theme ===== */
    html[data-style="cli"] {
      --bg: #0b0f0e;
      --card-bg: #101816;
      --text: #d1fae5;
      --text-secondary: #6ee7b7;
      --primary: #34d399;
      --primary-hover: #10b981;
      --border: #065f46;
      --accent-blue: #0b1512;
      --accent-green: #0f1c17;
      --accent-border-blue: #064e3b;
      --accent-border-green: #065f46;
      /* CLI uses terminal green for all accents */
      --accent-warning: #0f1c17;
      --accent-border-warning: #065f46;
      --text-warning: #6ee7b7;
      --accent-purple: #0f1c17;
      --accent-border-purple: #065f46;
      --text-purple: #6ee7b7;
    }
    html[data-style="cli"][data-display-theme="light"] {
      --bg: #f8fafc;
      --card-bg: #ffffff;
      --text: #0f172a;
      --text-secondary: #334155;
      --primary: #0f172a;
      --primary-hover: #334155;
      --border: #cbd5e1;
      --accent-blue: #e2e8f0;
      --accent-green: #dcfce7;
      --accent-border-blue: #94a3b8;
      --accent-border-green: #86efac;
      --accent-warning: #f1f5f9;
      --accent-border-warning: #94a3b8;
      --text-warning: #334155;
      --accent-purple: #f1f5f9;
      --accent-border-purple: #94a3b8;
      --text-purple: #334155;
    }
    html[data-style="cli"] .btn {
      text-transform: uppercase;
      letter-spacing: 0.05em;
      border-radius: 0;
    }
    html[data-style="cli"] .btn-primary {
      background: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
    }
    html[data-style="cli"] .btn-primary:hover {
      background: var(--primary);
      color: var(--bg);
    }
    html[data-style="cli"] .setting-card,
    html[data-style="cli"] .settings-section {
      border-radius: 0;
    }
    html[data-style="cli"] input,
    html[data-style="cli"] select,
    html[data-style="cli"] textarea {
      border-radius: 0;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      min-height: 100vh;
    }

    .header {
      background: var(--card-bg);
      border-bottom: 1px solid var(--border);
      padding: 1.25rem 1.5rem;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }

    .header-content {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .header h1 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text);
    }

    .btn {
      padding: 0.5rem 1rem;
      border: none;
      border-radius: 0.5rem;
      font-size: 0.875rem;
      font-weight: 500;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      transition: all 0.15s;
      text-decoration: none;
    }

    .btn-secondary {
      background: var(--border);
      color: var(--text);
    }

    .btn-secondary:hover {
      background: var(--border-light);
    }

    .btn-primary {
      background: var(--primary);
      color: white;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
    }

    .btn-danger {
      background: var(--danger);
      color: white;
    }

    .btn-danger:hover {
      background: var(--danger-hover);
    }

    .container {
      max-width: 800px;
      margin: 2rem auto;
      padding: 0 1rem;
    }

    .card {
      background: var(--card-bg);
      border-radius: 0.875rem;
      box-shadow: var(--shadow);
      border: 1px solid var(--border);
      padding: 2rem;
      margin-bottom: 1.5rem;
    }

    .card-title {
      font-size: 1.125rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      color: var(--text);
    }

    .security-notice {
      background: var(--accent-blue);
      border: 1px solid var(--accent-border-blue);
      border-radius: 0.75rem;
      padding: 1.25rem;
      margin-bottom: 1.5rem;
    }

    .security-notice.warning-notice {
      background: var(--accent-warning);
      border-color: var(--accent-border-warning);
    }

    .security-notice.warning-notice .security-notice-title,
    .security-notice.warning-notice .security-notice-text {
      color: var(--text-warning);
    }

    .security-notice-title {
      font-weight: 600;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      margin-bottom: 0.75rem;
      font-size: 0.9rem;
    }

    .security-notice-text {
      font-size: 0.825rem;
      color: var(--text);
      line-height: 1.6;
    }

    .security-features {
      margin-top: 0.875rem;
      padding-top: 0.875rem;
      border-top: 1px solid var(--accent-border-blue);
    }

    .security-feature {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.8rem;
      color: var(--text-secondary);
      margin-bottom: 0.375rem;
    }

    .security-feature::before {
      content: '✓';
      color: var(--success);
      font-weight: bold;
    }

    .api-section {
      border-radius: 0.75rem;
      padding: 1.5rem;
      margin-bottom: 1.5rem;
      border: 2px solid;
    }

    .api-section.transcription {
      background: var(--accent-green);
      border-color: var(--accent-border-green);
    }

    .api-section.llm {
      background: var(--accent-blue);
      border-color: var(--accent-border-blue);
    }

    .api-section-title {
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 1rem;
      padding-bottom: 0.75rem;
      border-bottom: 2px solid;
    }

    .api-section.transcription .api-section-title {
      color: var(--success);
      border-color: var(--accent-border-green);
    }

    .api-section.llm .api-section-title {
      color: var(--primary);
      border-color: var(--accent-border-blue);
    }

    .setting-group {
      margin-bottom: 1.25rem;
    }

    .setting-label {
      display: block;
      font-weight: 500;
      margin-bottom: 0.5rem;
      font-size: 0.875rem;
    }

    .setting-row {
      display: flex;
      gap: 0.5rem;
    }

    .setting-input {
      flex: 1;
      padding: 0.5rem 0.75rem;
      border: 1px solid var(--border);
      border-radius: 0.5rem;
      font-size: 0.875rem;
      background: var(--card-bg);
      color: var(--text);
    }

    .setting-input:focus {
      outline: none;
      border-color: var(--primary);
    }

    .model-select {
      padding: 0.5rem;
      border: 1px solid var(--border);
      border-radius: 0.5rem;
      background: var(--card-bg);
      color: var(--text);
      font-size: 0.875rem;
      min-width: 140px;
    }

    /* モバイルレスポンシブ（縦長画面対応） */
    @media (max-width: 480px) {
      .setting-row {
        flex-wrap: wrap;
      }

      .setting-row .setting-input {
        width: 100%;
        flex: none;
      }

      .setting-row .model-select {
        width: 100%;
        min-width: unset;
        margin-top: 0.5rem;
      }

      .api-actions {
        flex-wrap: wrap;
        gap: 0.5rem;
      }

      .api-action-btn {
        flex: 1;
        min-width: 80px;
      }
    }

    .setting-hint {
      font-size: 0.75rem;
      color: var(--text-secondary);
      margin-top: 0.25rem;
    }

    .setting-hint a {
      color: var(--primary);
    }

    .security-options {
      background: var(--accent-warning);
      border: 1px solid var(--accent-border-warning);
      border-radius: 0.75rem;
      padding: 1.25rem;
      margin-top: 1.5rem;
    }

    .security-options-title {
      font-weight: 600;
      color: var(--text-warning);
      margin-bottom: 0.875rem;
      font-size: 0.9rem;
    }

    .security-options.accent-blue {
      background: var(--accent-blue);
      border-color: var(--accent-border-blue);
    }
    .security-options.accent-blue .security-options-title,
    .security-options.accent-blue .checkbox-group label {
      color: var(--primary);
    }

    .security-options.accent-green {
      background: var(--accent-green);
      border-color: var(--accent-border-green);
    }
    .security-options.accent-green .security-options-title,
    .security-options.accent-green .checkbox-group label,
    .security-options.accent-green .setting-hint {
      color: var(--success);
    }

    .security-options.accent-purple {
      background: var(--accent-purple);
      border-color: var(--accent-border-purple);
    }
    .security-options.accent-purple .security-options-title,
    .security-options.accent-purple .setting-label {
      color: var(--text-purple);
    }

    .checkbox-group {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      margin-bottom: 0.5rem;
    }

    .checkbox-group input[type="checkbox"] {
      width: 1rem;
      height: 1rem;
    }

    .checkbox-group label {
      font-size: 0.8rem;
      color: var(--text-warning);
    }

    .validation-status {
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
      font-size: 0.7rem;
      padding: 0.25rem 0.625rem;
      border-radius: 1rem;
      margin-left: 0.5rem;
      border: 1px solid transparent;
    }

    .validation-pending {
      background: var(--accent-warning);
      color: var(--text-warning);
      border-color: var(--accent-border-warning);
    }

    .validation-success {
      background: var(--accent-green);
      color: var(--success);
      border-color: var(--accent-border-green);
    }

    .validation-error {
      background: var(--card-bg);
      color: var(--danger);
      border-color: var(--danger);
    }

    /* API action buttons */
    .api-actions {
      display: flex;
      gap: 0.5rem;
      margin-top: 0.5rem;
    }

    .api-action-btn {
      padding: 0.375rem 0.75rem;
      font-size: 0.75rem;
      border-radius: 0.375rem;
      border: 1px solid;
      cursor: pointer;
      transition: all 0.15s ease;
      font-weight: 500;
    }

    .api-action-btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }

    .btn-validate {
      background: var(--primary);
      color: white;
      border-color: var(--primary-hover);
    }

    .btn-validate:hover:not(:disabled) {
      background: var(--primary-hover);
    }

    .btn-clear {
      background: var(--border);
      color: var(--text);
      border-color: var(--border);
    }

    .btn-clear:hover:not(:disabled) {
      background: var(--border-light);
    }

    .settings-transfer {
      margin-top: 1.5rem;
      padding-top: 1.5rem;
      border-top: 1px solid var(--border);
    }

    .settings-transfer-title {
      font-weight: 600;
      margin-bottom: 0.75rem;
      font-size: 0.875rem;
    }

    .settings-transfer-buttons {
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
    }

    .settings-transfer-hint {
      font-size: 0.75rem;
      color: var(--text-secondary);
      margin-top: 0.5rem;
    }

    .action-buttons {
      display: flex;
      gap: 0.75rem;
      justify-content: flex-end;
      margin-top: 2rem;
      padding-top: 1.5rem;
      border-top: 1px solid var(--border);
    }

    .success-message {
      background: var(--accent-green);
      border: 1px solid var(--accent-border-green);
      color: var(--success);
      padding: 1rem;
      border-radius: 0.5rem;
      margin-bottom: 1.5rem;
      display: none;
    }

    .error-message {
      background: var(--card-bg);
      border: 1px solid var(--danger);
      color: var(--danger);
      padding: 1rem;
      border-radius: 0.5rem;
      margin-bottom: 1.5rem;
      display: none;
    }

    .close-tab-hint {
      display: none;
      margin: 0;
      padding: 10px 16px;
      font-size: 0.85rem;
      color: var(--text-secondary);
      background: var(--card-bg);
      border-bottom: 1px solid var(--border);
      text-align: center;
    }