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

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #64748b;
  --secondary-hover: #475569;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

body {
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  flex: 1;
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 30px 0 16px;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
}

header p {
  color: var(--text-muted);
  margin-top: 6px;
  font-size: 1rem;
}

main.main-layout {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-top: 16px;
}

.sidebar {
  flex: 0 0 260px;
  width: 260px;
  position: sticky;
  top: 20px;
}

.content {
  flex: 1;
  min-width: 0;
}

.type-section h2 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--text);
}

.type-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.type-card {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.type-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.type-card.active {
  border-color: var(--primary);
  background-color: #eff6ff;
  box-shadow: var(--shadow);
}

.sidebar .type-card {
  background: transparent;
  border-color: transparent;
  border-radius: 5px;
  padding: 8px 10px;
  flex-direction: row;
  gap: 10px;
  text-align: left;
}

.sidebar .type-card:hover {
  background: rgba(24, 119, 255, 0.04);
  box-shadow: none;
  transform: none;
}

.sidebar .type-card.active {
  background: rgba(24, 119, 255, 0.08);
}

@media (max-width: 900px) {
  .app-sidebar {
    min-width: 220px !important;
    max-width: 260px !important;
    flex: 0 0 auto !important;
    width: auto !important;
  }
}

.type-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
}

.type-icon svg {
  width: 28px;
  height: 28px;
}

.type-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.2;
}

.form-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.form-section h2,
.result-section h2 {
  font-size: 1.3rem;
  margin-bottom: 16px;
  color: var(--text);
}

#qrForm {
  background: transparent;
  border: none;
  padding: 0;
  box-shadow: none;
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 5px;
  color: var(--text);
  font-size: 0.9rem;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--card-bg);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group input::placeholder {
  color: #94a3b8;
}

.form-group input[type="color"] {
  width: 100%;
  height: 38px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  background: var(--card-bg);
}

.style-section {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.style-section h3 {
  font-size: 0.95rem;
  margin-bottom: 10px;
  color: var(--text);
}

.style-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.style-grid .form-group label {
  font-size: 0.82rem;
  margin-bottom: 4px;
}

.style-grid .form-group select {
  padding: 8px 12px;
  font-size: 0.9rem;
}

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  padding: 9px 20px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

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

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

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

.btn-secondary:hover {
  background-color: var(--secondary-hover);
}

.result-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-top: 16px;
}

.qr-display {
  background: #f1f5f9;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  justify-content: center;
}

.qr-display img {
  max-width: 100%;
  height: auto;
}

.qr-data {
  margin-top: 14px;
  padding: 12px;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.qr-data p {
  margin-bottom: 6px;
  word-break: break-all;
}

.qr-data code {
  background: #f1f5f9;
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.82rem;
  word-break: break-all;
}

.result-actions {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}

footer a {
  color: var(--primary);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  main.main-layout {
    flex-direction: column;
  }

  .sidebar {
    flex: none;
    width: 100%;
    position: static;
  }

  .type-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
}

@media (max-width: 600px) {
  .container {
    padding: 12px;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .type-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }

  .type-card {
    padding: 8px 6px;
  }

  .type-icon {
    width: 24px;
    height: 24px;
  }

  .type-icon svg {
    width: 24px;
    height: 24px;
  }

  .type-label {
    font-size: 0.72rem;
  }

  .form-section,
  .result-section {
    padding: 16px;
  }

  .form-actions,
  .result-actions {
    flex-direction: column;
  }

  .style-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}