:root {
  --primary: #4f46e5;
  --secondary: #0f172a;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #334155;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: linear-gradient(135deg, var(--primary), #6366f1);
  color: white;
  padding: 3rem 1.5rem;
  text-align: center;
}
header h1 {
  font-size: 2.4rem;
  margin-bottom: 0.5rem;
}
header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

.container {
  max-width: 1200px;
  margin: auto;
  padding: 2rem 1.5rem;
}
.container .ad-banner {
  background: #e5e7eb;
  border: 2px dashed #cbd5f5;
  text-align: center;
  padding: 1.5rem;
  margin: 2rem 0;
  font-size: 0.9rem;
  color: #64748b;
}
.container .tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.container .tools-grid .tool-card {
  background: var(--card);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}
.container .tools-grid .tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}
.container .tools-grid .tool-card h3 {
  color: var(--secondary);
  margin-bottom: 0.5rem;
}
.container .tools-grid .tool-card p {
  font-size: 0.95rem;
  margin-bottom: 1rem;
}
.container .tools-grid .tool-card a {
  display: inline-block;
  text-decoration: none;
  color: white;
  background: var(--primary);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
}
.container section.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}
.container section.features div.feature {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.container .card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2rem;
}
.container .card h2 {
  color: var(--secondary);
  margin-bottom: 1rem;
}
.container .card textarea, .container .card input {
  width: 100%;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 0.95rem;
}
.container .card textarea {
  resize: vertical;
  min-height: 120px;
}
.container .card .actions {
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.container .card .qr-result {
  margin-top: 2rem;
  text-align: center;
}
.container .card .qr-result #qrcode {
  margin: 1rem auto;
  width: 220px;
  height: 220px;
}
.container .card .result {
  margin-top: 1.5rem;
}
.container .card .error {
  margin-top: 0.75rem;
  color: #dc2626;
  font-size: 0.9rem;
  display: none;
}
.container button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}
.container button.secondary {
  background: #64748b;
}

.floating-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: white;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.06);
}
.floating-nav .nav-container {
  max-width: 1200px;
  margin: auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.floating-nav .nav-container ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  padding: 0.75rem 1rem;
  margin: 0;
}
.floating-nav .nav-container ul a {
  text-decoration: none;
  color: var(--secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}
.floating-nav .nav-container ul a:hover {
  background: var(--primary);
  color: white;
}
.floating-nav .nav-container ul a.active {
  background: var(--primary);
  color: white;
}
.floating-nav .nav-container .nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--secondary);
}
@media (max-width: 768px) {
  .floating-nav .nav-container .nav-toggle {
    display: block;
  }
  .floating-nav .nav-container .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .floating-nav .nav-container .nav-menu li {
    border-top: 1px solid var(--border);
  }
  .floating-nav .nav-container .nav-menu a {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 0;
  }
  .floating-nav .nav-container .nav-menu.open {
    display: flex;
  }
}

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