/* ── Tokens ─────────────────────────────────────────────── */
    :root {
      --bg:           #F3F4F6;
      --surface:      #FFFFFF;
      --surface-alt:  #F9FAFB;
      --border:       #E5E7EB;
      --text:         #1F2937;
      --muted:        #6B7280;
      --accent:       #DC2626;
      --accent-h:     #B91C1C;
      --accent-light: #FEE2E2;
      --radius:       12px;
      --shadow:       0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
      --shadow-lg:    0 8px 32px rgba(0,0,0,.12);
      --font:         'Inter', system-ui, sans-serif;
      --mono:         'JetBrains Mono', 'Fira Code', monospace;
      --transition:   .18s ease;
    }

    /* ── Reset ──────────────────────────────────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { font-size: 15px; -webkit-font-smoothing: antialiased; }
    body {
      font-family: var(--font);
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    /* ── Top bar ────────────────────────────────────────────── */
    .topbar {
      background: var(--surface);
      border-bottom: 1px solid var(--border);
      padding: 0 2rem;
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      position: sticky;
      top: 0;
      z-index: 100;
    }
    .topbar-brand {
      display: flex;
      align-items: center;
      gap: .6rem;
      font-weight: 700;
      font-size: 1.05rem;
      letter-spacing: -.02em;
      color: var(--text);
      text-decoration: none;
    }
    .topbar-brand .dot {
      width: 8px; height: 8px;
      border-radius: 50%;
      background: var(--accent);
      flex-shrink: 0;
    }
    .topbar-back {
      font-size: .8rem;
      color: var(--muted);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: .3rem;
      transition: color var(--transition);
    }
    .topbar-back:hover { color: var(--text); }
    .topbar-back svg { width: 14px; height: 14px; }

    /* ── Page layout ────────────────────────────────────────── */
    .page {
      flex: 1;
      display: grid;
      grid-template-columns: 420px 1fr;
      gap: 0;
      max-width: 1280px;
      width: 100%;
      margin: 0 auto;
      padding: 2rem 2rem 3rem;
      gap: 2rem;
      align-items: start;
    }

    /* ── Form panel ─────────────────────────────────────────── */
    .form-panel {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      overflow: hidden;
    }
    .form-header {
      padding: 1.4rem 1.6rem 1.2rem;
      border-bottom: 1px solid var(--border);
    }
    .form-header h1 {
      font-size: 1.05rem;
      font-weight: 700;
      letter-spacing: -.02em;
    }
    .form-header p {
      font-size: .8rem;
      color: var(--muted);
      margin-top: .2rem;
    }

    /* ── Type toggle ────────────────────────────────────────── */
    .toggle-wrap {
      padding: 1.2rem 1.6rem;
      border-bottom: 1px solid var(--border);
    }
    .toggle-label {
      font-size: .72rem;
      font-weight: 600;
      letter-spacing: .06em;
      text-transform: uppercase;
      color: var(--muted);
      margin-bottom: .5rem;
    }
    .toggle-group {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 6px;
      background: var(--surface-alt);
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 4px;
    }
    .toggle-btn {
      appearance: none;
      border: none;
      background: transparent;
      border-radius: 6px;
      padding: .55rem .8rem;
      font-size: .82rem;
      font-weight: 600;
      font-family: var(--font);
      color: var(--muted);
      cursor: pointer;
      transition: background var(--transition), color var(--transition);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: .4rem;
    }
    .toggle-btn.active {
      background: var(--surface);
      color: var(--text);
      box-shadow: 0 1px 4px rgba(0,0,0,.1);
    }
    .toggle-btn svg { width: 14px; height: 14px; flex-shrink: 0; }

    /* ── Fields ─────────────────────────────────────────────── */
    .fields-wrap { padding: 1.2rem 1.6rem; }
    .field-group { display: none; }
    .field-group.active { display: block; }

    .field {
      margin-bottom: 1rem;
    }
    .field:last-child { margin-bottom: 0; }
    .field label {
      display: block;
      font-size: .76rem;
      font-weight: 600;
      letter-spacing: .04em;
      text-transform: uppercase;
      color: var(--muted);
      margin-bottom: .35rem;
    }
    .field input,
    .field textarea {
      width: 100%;
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: .65rem .85rem;
      font-size: .88rem;
      font-family: var(--font);
      color: var(--text);
      background: var(--surface);
      transition: border-color var(--transition), box-shadow var(--transition);
      outline: none;
      resize: none;
    }
    .field input::placeholder,
    .field textarea::placeholder { color: var(--muted); }
    .field input:focus,
    .field textarea:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(220,38,38,.1);
    }
    .field textarea { min-height: 80px; }

    /* ── Submit ─────────────────────────────────────────────── */
    .form-footer {
      padding: 1rem 1.6rem 1.4rem;
      border-top: 1px solid var(--border);
    }
    .btn-generate {
      width: 100%;
      background: var(--accent);
      color: #fff;
      border: none;
      border-radius: 8px;
      padding: .75rem 1rem;
      font-size: .88rem;
      font-weight: 700;
      font-family: var(--font);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: .5rem;
      transition: background var(--transition), transform .1s;
    }
    .btn-generate:hover { background: var(--accent-h); }
    .btn-generate:active { transform: scale(.985); }
    .btn-generate:disabled {
      background: #E5E7EB;
      color: var(--muted);
      cursor: not-allowed;
      transform: none;
    }
    .btn-generate svg { width: 16px; height: 16px; }

    /* spinner inside button */
    .spinner {
      width: 15px; height: 15px;
      border: 2px solid rgba(255,255,255,.4);
      border-top-color: #fff;
      border-radius: 50%;
      animation: spin .65s linear infinite;
      display: none;
    }
    .btn-generate.loading .spinner { display: block; }
    .btn-generate.loading .btn-icon { display: none; }
    @keyframes spin { to { transform: rotate(360deg); } }

    /* ── Preview panel ──────────────────────────────────────── */
    .preview-panel {
      position: sticky;
      top: calc(56px + 2rem);
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }
    .preview-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      overflow: hidden;
    }
    .preview-header {
      padding: .9rem 1.3rem;
      border-bottom: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .preview-header span {
      font-size: .76rem;
      font-weight: 600;
      letter-spacing: .06em;
      text-transform: uppercase;
      color: var(--muted);
    }
    .badge {
      font-size: .68rem;
      font-weight: 700;
      padding: .2rem .55rem;
      border-radius: 99px;
      background: var(--accent-light);
      color: var(--accent);
      letter-spacing: .04em;
      text-transform: uppercase;
      display: none;
    }
    .badge.visible { display: inline-block; }

    .preview-body {
      padding: 1.4rem;
      min-height: 340px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* Empty state */
    .empty-state {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: .8rem;
      color: var(--muted);
      text-align: center;
    }
    .empty-state svg {
      width: 40px; height: 40px;
      opacity: .35;
    }
    .empty-state p {
      font-size: .82rem;
      max-width: 200px;
      line-height: 1.5;
    }

    /* Result image */
    .result-img {
      display: none;
      width: 100%;
      border-radius: 6px;
      box-shadow: var(--shadow-lg);
    }
    .result-img.visible { display: block; }

    /* ── Action row ─────────────────────────────────────────── */
    .action-row {
      display: none;
      gap: .6rem;
    }
    .action-row.visible { display: flex; }
    .btn-action {
      flex: 1;
      border-radius: 8px;
      padding: .65rem .9rem;
      font-size: .82rem;
      font-weight: 600;
      font-family: var(--font);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: .4rem;
      text-decoration: none;
      transition: background var(--transition), border-color var(--transition);
    }
    .btn-action svg { width: 14px; height: 14px; flex-shrink: 0; }
    .btn-download {
      background: var(--accent);
      color: #fff;
      border: 1px solid transparent;
    }
    .btn-download:hover { background: var(--accent-h); }
    .btn-reset {
      background: var(--surface);
      color: var(--text);
      border: 1px solid var(--border);
    }
    .btn-reset:hover { background: var(--surface-alt); }

    /* ── Error toast ────────────────────────────────────────── */
    .toast {
      position: fixed;
      bottom: 1.5rem;
      left: 50%;
      transform: translateX(-50%) translateY(12px);
      background: #1F2937;
      color: #fff;
      border-radius: 8px;
      padding: .65rem 1.1rem;
      font-size: .82rem;
      font-weight: 500;
      opacity: 0;
      pointer-events: none;
      transition: opacity .22s, transform .22s;
      z-index: 999;
      white-space: nowrap;
    }
    .toast.show {
      opacity: 1;
      transform: translateX(-50%) translateY(0);
    }

    /* ── Responsive ─────────────────────────────────────────── */
    @media (max-width: 860px) {
      .page {
        grid-template-columns: 1fr;
        padding: 1rem;
        gap: 1.2rem;
      }
      .preview-panel { position: static; }
    }