:root {
  --background: #ffffff;
  --card: #ffffff;
  --text: #020617;
  --soft: #64748b;
  --muted: #f1f5f9;
  --border: #e2e8f0;
  --primary: #2563eb;
}

.dark {
  --background: #0b1020;
  --card: #0e162b;
  --text: #e5e7eb;
  --soft: #94a3b8;
  --muted: #0f172a;
  --border: #1f2937;
  --primary: #60a5fa;
}

.qr-generator {
  max-width: 90%;
  margin: 2rem auto;
  padding: 2rem;
  background: var(--card); 
  border-radius: 1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  color: var(--text); 
        }
.qr-generator:hover {
  transform: translateY(-1px);
  opacity: 1;
}

.qr-generator h1 {
  font-size: 2rem;
  font-weight: 800;
  margin: .4rem 0 0.5rem;
  text-align: center;
  color: var(--text);
}

.qr-generator p {
  font-size: 1rem;
  text-align: center;
  color: var(--soft);
}

.tool-container {
  max-width: 900px;
  margin: 2rem auto;
}

.main-content {
  max-width: 960px;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin: auto;
}

@media (min-width: 768px) {
  .main-content {
    grid-template-columns: 1fr 350px;
  }
}

.card {
  padding: 2rem;
  background: var(--card);
  border-radius: 14px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.07),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
}

.input-wrapper {
  margin-bottom: 1.5rem;
}

.input-wrapper label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.input-wrapper input[type="text"],
.input-wrapper input[type="file"],
.input-wrapper input[type="color"] {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrapper input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.color-input-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.color-input-container input[type="color"] {
  width: 40px;
  height: 40px;
  padding: 0.25rem;
  border-radius: 8px;
  cursor: pointer;
}

.color-input-container input[type="text"] {
  flex-grow: 1;
}

#qrcode-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
  border: 2px dashed var(--border);
  border-radius: 12px;
  min-height: 256px;
  position: relative;
}

#qrcode {
  padding: 10px;
  background-color: white;
  border-radius: 6px;
}

#qrcode img {
  display: block;
  margin: auto;
}

.preview-panel {
  text-align: center;
  padding-top: 1rem;
  overflow: hidden;
}

.download-btns {
  margin-top: 1.5rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
}

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

.btn-primary:hover {
  background-color: #1d4ed8;
}

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

.btn-secondary:hover {
  background-color: #e2e8f0;
}

.loader {
  font-size: 1.25rem;
  color: var(--soft);
}

    .qr-tabs {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
      margin-bottom: 1rem;
      justify-content: center;
    }
    .qr-tab {
      flex: 1 0 auto;
      display: flex;
      align-items: center;
      gap: 0.35rem;
      padding: 0.5rem 0.9rem;
      border: 1px solid var(--border);
      border-radius: 8px;
      cursor: pointer;
      background: var(--muted);
      font-size: 0.9rem;
      transition: background 0.25s, transform 0.15s;
      justify-content: center;
      opacity: 0.9;
    }
    .qr-tab:hover {
      background: #e2e8f0;
      transform: translateY(-1px);
      opacity: 1;
    }
    .qr-tab.active {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
      transform: scale(1.02);
    }
    .qr-tab span {
      font-size: 0.95rem;
      line-height: 1;
    }
    /* Fade animation for switching */
    .fade-in {
      animation: fadeIn 0.3s ease-in-out;
    }
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(5px); }
      to { opacity: 1; transform: translateY(0); }
    }

    #qrcode-container {
      display: flex;
      justify-content: center;
      align-items: center;
      margin: 1rem auto;
      min-height: 260px;
      transition: all 0.3s ease;
    }


  /* =========================
   MOBILE ENHANCEMENTS 
   ========================= */
@media (max-width: 520px) {

  .qr-generator {
    max-width: none !important; 
    width: 100% !important;
    padding: 1.2rem !important;
    margin: 1rem auto 1rem !important;
    border-radius: 1rem !important;
    box-shadow: 0 3px 10px rgba(0,0,0,0.15) !important;
  }

  /* Headings & Text */
  .qr-generator h1 {
    font-size: 1.55rem !important;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.3 !important;
    text-align: center !important;
  }

  .qr-generator p {
    font-size: 0.92rem !important;
    font-weight: 500 !important;
    line-height: 1.55 !important;
    text-align: center !important;
    margin-bottom: 1rem !important;
  }

  .options-panel {
    flex: 1;
    width: 100% !important;
    background: var(--muted); 
    padding: 1.5rem 1rem 0rem;
    border-radius: 12px;
    border: 0rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    overflow: hidden;
  }
 
  .preview-panel {
    flex: 1;
    width: 100% !important;
    text-align: center;
    padding: 0rem 1.5rem 0rem;
    padding-bottom: 1rem;
    border-radius: 12px;
    border: none;
    background: var(--muted);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    display: none; /* MODIFICATION: Hide by default on mobile */
  }

  /* MODIFICATION: Added this new rule */
  .preview-panel.mobile-visible {
    display: block;
  }

 .main-content {
    max-width: 960px;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin: auto;
  }

  .qr-tab {
    background: var(--card);
  }

  .qr-generator label {
    font-size: 1rem !important;
    font-weight: 800;
  }

  /* Accessibility focus highlight */
  input:focus, select:focus, button:focus {
    outline: 2px solid var(--ring);
    outline-offset: 0.5px;
  }
}