:root {
    --bg: #0f0f0f;
    --surface: #181818;
    --surface2: #222222;
    --border: #2e2e2e;
    --border2: #3a3a3a;
    --text: #f0f0f0;
    --text2: #888;
    --text3: #555;
    --purple: #7c6af7;
    --purple-dim: #2d2850;
    --purple-light: #ede9ff;
    --green: #3ecf8e;
    --green-dim: #0d2e1f;
    --red: #f56565;
    --red-dim: #2d1515;
    --amber: #f6c90e;
    --amber-dim: #2d2510;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    font-size: 14px;
    min-height: 100vh;
  }

  /* === Login screen === */
  .login-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
  }

  .login-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 2rem;
    width: 100%;
    max-width: 360px;
  }

  .login-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
  }

  .login-subtitle {
    font-size: 12px;
    color: var(--text3);
    font-family: 'DM Mono', monospace;
    margin-bottom: 1.5rem;
  }

  .login-field {
    margin-bottom: 12px;
  }

  .login-label {
    font-size: 11px;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    display: block;
    font-family: 'DM Mono', monospace;
  }

  .login-input, .login-select {
    width: 100%;
    background: var(--surface2);
    border: 1px solid var(--border2);
    border-radius: 7px;
    padding: 10px 12px;
    color: var(--text);
    font-size: 14px;
    font-family: 'DM Sans', sans-serif;
    outline: none;
    transition: border-color 0.15s;
  }

  .login-input:focus, .login-select:focus { border-color: var(--purple); }

  .login-btn {
    width: 100%;
    background: var(--purple);
    border: none;
    border-radius: 7px;
    padding: 11px;
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    margin-top: 8px;
    transition: background 0.15s;
  }

  .login-btn:hover { background: #6b5ce7; }
  .login-btn:disabled { opacity: 0.5; cursor: not-allowed; }

  .login-error {
    font-size: 12px;
    color: var(--red);
    margin-top: 10px;
    display: none;
  }

  /* === Topbar === */
  .topbar {
    border-bottom: 1px solid var(--border);
    padding: 0 2rem;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    background: rgba(15,15,15,0.95);
    backdrop-filter: blur(8px);
    z-index: 100;
  }

  .logo {
    font-family: 'DM Mono', monospace;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    letter-spacing: 0.5px;
  }

  .logo span { color: var(--purple); }

  .user-row {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .user-badge {
    font-size: 12px;
    font-family: 'DM Mono', monospace;
    color: var(--text2);
    padding: 4px 10px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 6px;
  }

  .logout-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text3);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-family: 'DM Mono', monospace;
    cursor: pointer;
    transition: all 0.15s;
  }

  .logout-btn:hover { color: var(--text); border-color: var(--border2); }

  .container {
    max-width: 860px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
  }

  .mode-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
  }

  .mode-tab {
    flex: 1;
    padding: 10px 16px;
    border-radius: 7px;
    border: none;
    background: transparent;
    color: var(--text3);
    font-family: 'DM Mono', monospace;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    letter-spacing: 0.5px;
    text-transform: uppercase;
  }

  .mode-tab:hover { color: var(--text2); background: var(--surface2); }
  .mode-tab.active { background: var(--green); color: #0a0a0a; }

  .lang-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
    overflow-x: auto;
  }

  .lang-tab {
    flex: 1;
    min-width: 60px;
    padding: 8px 12px;
    border-radius: 7px;
    border: none;
    background: transparent;
    color: var(--text3);
    font-family: 'DM Mono', monospace;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    letter-spacing: 0.3px;
  }

  .lang-tab:hover { color: var(--text2); background: var(--surface2); }
  .lang-tab.active { background: var(--purple); color: #fff; }

  .lang-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.5rem;
  }

  .lang-name {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.5px;
  }

  .currency-badge {
    font-size: 11px;
    font-family: 'DM Mono', monospace;
    padding: 3px 8px;
    border-radius: 4px;
    background: var(--surface2);
    border: 1px solid var(--border2);
    color: var(--text2);
  }

  .currency-badge.warn {
    background: rgba(246,201,14,0.1);
    border-color: rgba(246,201,14,0.3);
    color: var(--amber);
  }

  .conversion-box {
    margin-top: 8px;
    padding: 8px 10px;
    border-radius: 6px;
    background: var(--amber-dim);
    border: 1px solid rgba(246,201,14,0.3);
    font-family: 'DM Mono', monospace;
    font-size: 11px;
    max-width: 340px;
  }
  .conversion-box .conv-title { color: var(--amber); margin-bottom: 5px; }
  .conversion-box .conv-row { display: flex; gap: 8px; color: var(--text); line-height: 1.7; }
  .conversion-box .conv-row span:nth-child(2) { color: var(--text3); }
  .conversion-box .conv-note { color: var(--text2); margin-top: 5px; font-size: 10px; }

  /* --- Voice (TTS) step --- */
  .tts-filters { display:flex; gap:12px; margin-bottom:10px; flex-wrap:wrap; }
  .tts-filter { font-size:11px; color:var(--text3); text-transform:uppercase; letter-spacing:0.5px; display:flex; flex-direction:column; gap:4px; }
  .tts-filter select { background:var(--surface2); border:1px solid var(--border2); color:var(--text); padding:7px 10px; border-radius:6px; font-size:13px; font-family:inherit; outline:none; cursor:pointer; }
  .tts-filter select:focus { border-color:var(--purple); }
  .tts-lang-fixed { background:var(--bg); border:1px solid var(--border); color:var(--text2); padding:7px 10px; border-radius:6px; font-size:13px; min-width:120px; text-transform:none; }
  .tts-voice-list { max-height:280px; overflow-y:auto; border:1px solid var(--border); border-radius:8px; background:var(--bg); }
  .tts-voice-row { display:flex; align-items:center; gap:10px; padding:9px 12px; border-bottom:1px solid var(--border); cursor:pointer; }
  .tts-voice-row:last-child { border-bottom:none; }
  .tts-voice-row:hover { background:var(--surface2); }
  .tts-voice-row.selected { background:var(--purple-dim); }
  .tts-voice-radio { flex:0 0 auto; width:16px; height:16px; border-radius:50%; border:2px solid var(--border2); box-sizing:border-box; }
  .tts-voice-row.selected .tts-voice-radio { border-color:var(--purple); background:var(--purple); box-shadow:inset 0 0 0 3px var(--bg); }
  .tts-voice-main { flex:1 1 auto; min-width:0; }
  .tts-voice-name { font-size:13px; font-weight:600; color:var(--text); }
  .tts-voice-desc { font-size:11px; color:var(--text2); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
  .tts-preview-btn { flex:0 0 auto; background:var(--surface2); border:1px solid var(--border2); color:var(--text); width:30px; height:30px; border-radius:50%; cursor:pointer; font-size:11px; line-height:1; }
  .tts-preview-btn:hover { border-color:var(--purple); color:var(--purple); }
  .tts-preview-btn.playing { color:var(--green); border-color:var(--green); }
  .tts-auto { font-size:11px; color:var(--text3); font-family:'DM Mono', monospace; margin-top:8px; }
  .tts-auto.warn { color:var(--amber); }
  .tts-empty { padding:14px; color:var(--text3); font-size:12px; text-align:center; }
  .tts-note { padding:8px 12px; margin-bottom:6px; color:var(--text2); font-size:11px; line-height:1.4; background:var(--surface2); border:1px solid var(--border2); border-radius:6px; }
  .tts-voice-list::-webkit-scrollbar { width:8px; }
  .tts-voice-list::-webkit-scrollbar-track { background:transparent; }
  .tts-voice-list::-webkit-scrollbar-thumb { background:var(--border2); border-radius:4px; }
  .tts-voice-list::-webkit-scrollbar-thumb:hover { background:var(--text3); }
  .tts-result { margin-top:0.85rem; padding:14px; background:var(--surface2); border:1px solid var(--border2); border-radius:10px; }
  .tts-result-label { font-size:12px; color:var(--green); font-weight:600; margin-bottom:10px; display:flex; align-items:center; gap:6px; }
  .tts-player { display:flex; align-items:center; gap:12px; }
  .tts-play { flex:0 0 auto; width:40px; height:40px; border-radius:50%; border:none; background:var(--purple); color:#fff; font-size:13px; cursor:pointer; display:flex; align-items:center; justify-content:center; }
  .tts-play:hover { filter:brightness(1.12); }
  .tts-bar { flex:1 1 auto; height:6px; background:var(--border2); border-radius:3px; cursor:pointer; }
  .tts-bar-fill { height:100%; width:0%; background:var(--purple); border-radius:3px; }
  .tts-time { flex:0 0 auto; font-family:'DM Mono', monospace; font-size:12px; color:var(--text2); min-width:84px; text-align:right; }

  .steps {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .step {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.2s;
  }

  .step.active { border-color: var(--border2); }
  .step.locked { opacity: 0.4; pointer-events: none; }
  .step.done { border-color: rgba(62,207,142,0.25); }

  .step-head {
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .step-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--surface2);
    border: 1px solid var(--border2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'DM Mono', monospace;
    font-size: 11px;
    color: var(--text3);
    flex-shrink: 0;
    transition: all 0.2s;
  }

  .step.active .step-icon { background: var(--purple-dim); border-color: var(--purple); color: var(--purple); }
  .step.done .step-icon { background: var(--green-dim); border-color: var(--green); color: var(--green); }

  .step-title { font-weight: 500; font-size: 14px; }
  .step-desc { font-size: 12px; color: var(--text3); margin-top: 2px; }

  .step-body {
    padding: 0 1.25rem 1.25rem;
    border-top: 1px solid var(--border);
  }

  textarea {
    width: 100%;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    font-size: 13px;
    font-family: 'DM Sans', sans-serif;
    color: var(--text);
    resize: vertical;
    min-height: 150px;
    outline: none;
    line-height: 1.6;
    margin-top: 1rem;
    transition: border-color 0.15s;
  }

  textarea:focus { border-color: var(--border2); }

  .char-counter {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 6px;
    font-size: 11px;
    font-family: 'DM Mono', monospace;
    color: var(--text3);
  }

  .char-counter.warn { color: var(--amber); }
  .char-counter.over { color: var(--red); }

  .btn-row {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    align-items: center;
    flex-wrap: wrap;
  }

  .btn {
    padding: 7px 16px;
    border-radius: 7px;
    border: 1px solid var(--border2);
    background: transparent;
    color: var(--text2);
    font-family: 'DM Sans', sans-serif;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .btn:hover:not(:disabled) { background: var(--surface2); color: var(--text); border-color: var(--border2); }
  .btn:disabled { opacity: 0.35; cursor: not-allowed; }

  .btn-primary {
    background: var(--purple);
    border-color: var(--purple);
    color: #fff;
  }

  .btn-primary:hover:not(:disabled) { background: #6b5ce7; border-color: #6b5ce7; }

  .btn-sm {
    padding: 5px 12px;
    font-size: 12px;
    border-radius: 6px;
  }

  .btn-copied {
    background: var(--green-dim) !important;
    border-color: rgba(62,207,142,0.4) !important;
    color: var(--green) !important;
  }

  .output {
    margin-top: 12px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    font-size: 13px;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--text);
    min-height: 60px;
  }

  .btn-retry {
    font-size: 12px;
    padding: 7px 14px;
    background: var(--red);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin-left: 6px;
    font-weight: 500;
    font-family: inherit;
  }
  .btn-retry:hover { opacity: 0.85; }
  .btn-retry:active { transform: scale(0.97); }

  .error {
    font-size: 12px;
    color: var(--red);
    background: var(--red-dim);
    border: 1px solid rgba(245,101,101,0.25);
    border-radius: 6px;
    padding: 6px 10px;
  }

  .spinner {
    width: 12px;
    height: 12px;
    border: 2px solid rgba(255,255,255,0.25);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.65s linear infinite;
  }

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

  .hidden { display: none !important; }

  .flow-arrow {
    text-align: center;
    color: var(--text3);
    font-size: 16px;
    line-height: 1;
    margin: -2px 0;
  }
  .login-google { display:flex; justify-content:center; margin: 4px 0 10px; min-height:44px; }
  .login-hint { font-size:11px; color:var(--text3); text-align:center; margin-bottom:8px; }