.tool-container {
      max-width: 880px;
      margin: 0 auto;
      
    }
.card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 20px;
      padding: 24px;
      box-shadow: var(--shadow);
    }
p.sub {
      margin: 0 0 18px;
      opacity: 0.7;
    }
.row {
      display: flex;
      gap: 12px;
      align-items: center;
      margin: 8px 0 18px;
      flex-wrap: wrap;
    }
.input {
      flex: 1;
      min-width: 200px;
      background: var(--card-bg);
      color: var(--text-color);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 14px 16px;
      font-size: 16px;
      outline: none;
    }
.input:focus {
      border-color: var(--primary-color);
    }
.btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--primary-color);
      color: var(--accent-ink);
      border: none;
      border-radius: 12px;
      padding: 12px 14px;
      font-weight: 700;
      cursor: pointer;
      white-space: nowrap;
    }
.btn:hover {
      opacity: 0.9;
    }
.btn.secondary {
      background: var(--card-bg);
      color: var(--text-color);
      border: 1px solid var(--border-color);
    }
.out {
      background: var(--bg-color);
      border: 1px dashed var(--border-color);
      padding: 14px 16px;
      border-radius: 14px;
      font-family: var(--f-mono);
      overflow: auto;
      white-space: nowrap;
      flex: 1;
    }
.hint {
      font-size: 13px;
      opacity: 0.7;
      margin-top: 10px;
    }
.error {
      color: var(--svg);
      font-weight: 700;
      margin-top: 10px;
    }
.grid {
      display: grid;
      grid-template-columns: 1fr auto auto;
      gap: 10px;
      align-items: stretch;
    }
@media (max-width: 600px) {
.grid {
        grid-template-columns: 1fr;
      }
}
.drop {
      margin-top: 14px;
      border: 1px dashed var(--border-color);
      border-radius: 14px;
      padding: 12px;
      text-align: center;
      opacity: 0.7;
      transition: all 0.3s;
    }
.drop.drag {
      border-color: var(--primary-color);
      opacity: 1;
    }
.mini {
      font-size: 12px;
      opacity: 0.6;
    }

.tool-container, .card, .grid, .row { min-width: 0; }
.out { min-width: 0; }
.row > * { max-width: 100%; }
@media (max-width: 600px) { .grid { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 480px) { .card { padding: 16px; } }