:root { --blue:#2563eb; --green:#16a34a; --dark:#0f172a; --panel:#1e293b; }

/* The Professional Side-by-Side Grid */
.tool-layout {
    display: grid;
    grid-template-columns: 360px 1fr; 
    gap: 20px;
    padding: 20px;
    background: #f1f5f9;
    min-height: 90vh;
    align-items: start; /* Prevents stretching */
}

/* Left Panel */
.input-panel {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

/* Right Panel (Black Screen) */
.output-panel {
    background: var(--dark);
    padding: 20px;
    border-radius: 12px;
    color: #f8fafc;
    overflow-y: auto;
    min-height: 85vh;
}

/* Test Case Cards */
.test-card {
    background: var(--panel);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border-left: 5px solid var(--blue);
    position: relative;
    transition: transform 0.2s ease;
    border: 1px solid #334155;
}

.test-card:hover {
    transform: translateY(-2px);
    border-color: var(--blue);
}

.copy-btn {
    position: absolute;
    right: 15px;
    top: 15px;
    background: var(--blue);
    color: #fff;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 10px;
}

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

/* Form UI */
textarea, select, input { width: 100%; padding: 12px; margin-bottom: 15px; border-radius: 8px; border: 1px solid #e5e7eb; display: block; }
.label { font-size: 11px; font-weight: 800; text-transform: uppercase; color: #2563eb; margin-bottom: 5px; display: block; }

.feature-box { display: none; margin-bottom: 10px; }
.feature-box label {
    display: inline-flex;
    align-items: center;
    background: #e0e7ff;
    padding: 6px 10px;
    border-radius: 6px;
    margin: 3px;
    font-size: 12px;
    cursor: pointer;
    color: #1e293b;
}
.step-list li { margin-bottom: 6px; color: #cbd5e1; }

/* ==============================
   RESPONSIVE FIX (MOBILE & TAB)
============================== */

@media (max-width: 1024px) {
  .tool-layout {
    grid-template-columns: 1fr;
    padding: 14px;
  }

  .output-panel {
    min-height: auto;
    margin-top: 20px;
  }
}

@media (max-width: 768px) {
  .tool-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .input-panel,
  .output-panel {
    padding: 16px;
    border-radius: 10px;
  }

  .output-panel {
    max-height: none;
    overflow-y: visible;
  }

  .test-card {
    padding: 16px;
  }

  .copy-btn {
    top: 10px;
    right: 10px;
    padding: 5px 10px;
    font-size: 9px;
  }
}

@media (max-width: 480px) {
  .tool-layout {
    padding: 10px;
  }

  textarea {
    min-height: 160px;
  }

  .tools-panel a {
    font-size: 13px;
  }
}