/* Ultra-responsive, smooth, user-friendly CSS for Smart QR Maker page */

/* Root and base styles */
:root {
  --primary: #2563eb;
  --secondary: #ff9800;
  --bg: #fafbfc;
  --panel-bg: #fff;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 2px 24px rgba(0,0,0,0.08);
  --gap: 2rem;
  --transition: 0.22s cubic-bezier(.55,.55,0,1);
  --font-main: 'Inter', 'Segoe UI', Arial, sans-serif;
  --text: #222;
  --text-light: #586069;
  --card-bg: #f6f7fb;
  --footer-bg: #ececec;
}

html {
  box-sizing: border-box;
  font-size: 16px;
  scroll-behavior: smooth;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  font-family: var(--font-main);
  color: var(--text);
  background: var(--bg);
  margin: 0;
  min-height: 100vh;
  line-height: 1.6;
  transition: background-color var(--transition);
}

/* Navbar */
header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
  position: sticky;
  top: 0;
  z-index: 20;
}

.navbar {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  padding: 0.7rem 1.5rem;
  justify-content: space-between;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -1px;
  display: flex;
  align-items: center;
  gap: 0.1em;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links li a {
  text-decoration: none;
  color: var(--text-light);
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links li a:hover {
  color: var(--primary);
}

/* Main Grid Layout */
.container {
  max-width: 1200px;
  margin: 2.5rem auto;
  padding: 0 1.5rem;
}

.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .panel.preview {
    order: -1; /* Show preview first on mobile */
  }
}

/* Panels */
.panel {
  background: var(--panel-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem;
  min-width: 0;
  transition: box-shadow var(--transition);
  border: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.controls h2,
.preview h2 {
  font-size: 1.25rem;
  margin-bottom: 0.7em;
  color: var(--primary);
  letter-spacing: -1px;
}

/* Form styles */
.field {
  display: flex;
  flex-direction: column;
  gap: 0.25em;
  margin-bottom: 1.1em;
  font-size: 0.98rem;
}

.field span {
  font-weight: 500;
  color: var(--text-light);
}

input[type="number"], input[type="color"], input[type="file"], select, textarea {
  padding: 0.5em 0.7em;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1em;
  background: #f9f9fb;
  transition: border-color var(--transition), box-shadow var(--transition);
}

input[type="color"] {
  padding: 0.15em;
  height: 2.1em;
  width: 2.5em;
  border-radius: 0.5em;
  border: 1px solid var(--border);
  background: #fff;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 2px #2563eb22;
}

/* Two columns for desktop, stacked on mobile */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1em;
  margin-bottom: 1.1em;
}
@media (max-width: 600px) {
  .two-col {
    grid-template-columns: 1fr;
    gap: 0.5em;
  }
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  padding: 0.8em 1.6em;
  font-size: 1rem;
  margin: 0.3em 0.3em 0.3em 0;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  box-shadow: 0 2px 8px rgba(37,99,235,0.08);
  text-decoration: none;
}

.btn.primary {
  background: linear-gradient(90deg, var(--primary) 70%, var(--secondary) 100%);
}

.btn:hover, .btn:focus {
  background: var(--secondary);
  color: #222;
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 4px 16px rgba(37,99,235,0.18);
}

.btn a {
  color: inherit;
  text-decoration: none;
  display: block;
}

.actions {
  display: flex;
  gap: 0.7em;
  flex-wrap: wrap;
  margin-bottom: 1em;
}

.download-controls {
  display: flex;
  gap: 0.6em;
  margin-bottom: 0.8em;
  flex-wrap: wrap;
}

/* Separator */
.sep {
  border: none;
  border-top: 1.5px solid var(--border);
  margin: 1.5em 0;
}

/* Details / extra info */
.extra-info summary {
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  font-size: 1.02em;
  margin-bottom: 0.5em;
}
.extra-info ul {
  margin-top: 0.7em;
  padding-left: 1.3em;
  color: var(--text-light);
  font-size: 0.98em;
}

/* QR Preview */
.preview {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.qr-wrap {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  padding: 1.3em;
  margin-bottom: 1.2em;
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.meta {
  font-size: 0.98em;
  color: var(--text-light);
  margin-bottom: 1em;
  text-align: center;
}

.seo-hint {
  background: #f3f6fc;
  color: #2563eb;
  font-size: 0.96em;
  border-radius: 7px;
  padding: 0.8em 1em;
  margin-top: 1em;
  text-align: center;
}

/* Cards section */
.cards {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 2rem;
  padding: 2rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  padding: 1.5em 1.2em;
  font-size: 1.06em;
  color: var(--text);
  transition: box-shadow var(--transition), transform var(--transition);
  border: 1px solid var(--border);
}

.card:hover {
  box-shadow: 0 8px 32px rgba(37,99,235,0.09);
  transform: translateY(-2px) scale(1.02);
}

@media (max-width: 900px) {
  .cards {
    grid-template-columns: 1fr;
    gap: 1.2rem;
    padding: 1.2rem 0.7rem;
  }
  .card {
    font-size: 1em;
    padding: 1.1em 0.8em;
  }
}

/* Footer */
.site-footer {
  background: var(--footer-bg);
  padding: 1.5em 0 0.7em 0;
  text-align: center;
  font-size: 1em;
  border-top: 1.5px solid var(--border);
}

.site-footer p {
  margin: 0.3em 0;
  color: var(--text-light);
}

.site-footer .small {
  font-size: 0.92em;
  color: #2563eb;
}

/* Accessibility improvements */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15191e;
    --panel-bg: #20242b;
    --border: #283142;
    --text: #f8fafd;
    --text-light: #9ca3af;
    --card-bg: #1e2229;
    --footer-bg: #181a20;
  }

  body, .panel, .card, .qr-wrap, .site-footer {
    color: var(--text);
    background: var(--bg);
    border-color: var(--border);
  }

  .panel, .card, .qr-wrap {
    background: var(--panel-bg);
  }

  .seo-hint {
    background: #213477;
    color: #ffd23f;
  }
}

/* Ultra responsive tweaks for extra small screens */
@media (max-width: 480px) {
  html { font-size: 15px; }
  .panel, .container, .cards {
    padding: 1em 0.2em;
  }
  .navbar {
    flex-direction: column;
    gap: 0.5em;
    padding: 0.5em 0.5em;
  }
  .logo {
    font-size: 1.1rem;
  }
  .main-grid {
    gap: 1em;
  }
}

/* Animation for smooth transitions */
.panel, .card, .qr-wrap {
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition), border-color var(--transition);
}

.btn, input, select, textarea {
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
}