@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/inter-regular.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/fonts/inter-semibold.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/fonts/inter-bold.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url('/fonts/inter-extrabold.woff2') format('woff2');
}

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

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --max-width: 1100px;
}

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

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

/* NAV */
.nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 32px;
  height: 60px;
  overflow-x: auto;
}

.nav-logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  background: #eff6ff;
  color: var(--primary);
  text-decoration: none;
}

/* MAIN */
main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px;
  width: 100%;
}

h1 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 17px;
  margin-bottom: 32px;
  max-width: 600px;
}

/* GENERATOR LAYOUT */
.generator {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 32px;
  align-items: start;
}

.form-card, .preview-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

/* FORM */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

.checkbox-group label {
  margin-bottom: 0;
  font-weight: 400;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn:active { transform: scale(0.98); }

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

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

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}

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

.btn-group {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

/* PREVIEW */
.preview-card {
  position: sticky;
  top: 80px;
  text-align: center;
}

.qr-output {
  background: white;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 20px;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-output canvas {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.qr-placeholder {
  color: var(--text-muted);
  font-size: 14px;
}

/* LOGO UPLOAD */
.logo-upload {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.logo-upload-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-muted);
  transition: border-color 0.15s, background 0.15s;
}

.logo-upload-label:hover {
  border-color: var(--primary);
  background: #f0f7ff;
}

.logo-upload-label svg {
  flex-shrink: 0;
}

.logo-preview {
  display: none;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  padding: 8px;
  background: var(--bg);
  border-radius: 8px;
}

.logo-preview img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 4px;
}

.logo-preview .remove-logo {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
  padding: 4px 8px;
}

/* LANDING PAGE GRID */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
  display: block;
  color: var(--text);
}

.tool-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  text-decoration: none;
}

.tool-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}

.tool-card h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.tool-card p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5;
}

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* FAQ */
.faq-section {
  margin-top: 60px;
}

.faq-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}

.faq-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.faq-item p {
  color: var(--text-muted);
  font-size: 14px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .generator {
    grid-template-columns: 1fr;
  }

  .preview-card {
    position: static;
  }

  .nav-inner {
    gap: 16px;
  }

  h1 { font-size: 24px; }
  .form-row { grid-template-columns: 1fr; }

  main { padding: 24px 16px; }
}