:root {
  --bg: #0b1220;
  --surface: #121a2b;
  --card: #182235;
  --border: #2a3957;
  --text: #e8eefc;
  --muted: #9aabc9;
  --primary: #3dd6c6;
  --primary-dark: #22b8a8;
  --accent: #7aa2ff;
  --danger: #ff6b7a;
  --ok: #4ade80;
  --radius: 14px;
  --shadow: 0 10px 40px rgba(0,0,0,.35);
  --font: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: radial-gradient(1200px 600px at 10% -10%, #1a2b4a 0%, transparent 55%),
              radial-gradient(900px 500px at 100% 0%, #12363a 0%, transparent 50%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: #7ff0e4; }
img { max-width: 100%; height: auto; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11,18,32,.82);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: 1100px; margin: 0 auto;
  padding: .85rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.logo {
  font-weight: 800; font-size: 1.15rem; color: var(--text); letter-spacing: -.02em;
}
.logo span { color: var(--primary); }
.nav-links { display: flex; flex-wrap: wrap; gap: .85rem; }
.nav-links a { color: var(--muted); font-size: .92rem; }
.nav-links a:hover { color: var(--text); }

.hero {
  max-width: 1100px; margin: 0 auto;
  padding: 2.5rem 1.25rem 1rem;
}
.hero h1 {
  margin: 0 0 .75rem; font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1.2; letter-spacing: -.03em;
}
.hero p { margin: 0; color: var(--muted); max-width: 52rem; font-size: 1.05rem; }
.badge-row { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.1rem; }
.badge {
  display: inline-flex; align-items: center; gap: .35rem;
  background: rgba(61,214,198,.12); color: var(--primary);
  border: 1px solid rgba(61,214,198,.28);
  border-radius: 999px; padding: .3rem .75rem; font-size: .82rem; font-weight: 600;
}

.container { max-width: 1100px; margin: 0 auto; padding: 1rem 1.25rem 3rem; }

.ad-slot {
  border: 1px dashed var(--border); border-radius: var(--radius);
  background: rgba(255,255,255,.02);
  color: var(--muted); text-align: center;
  padding: 1rem; margin: 1.25rem 0; font-size: .85rem;
}

.generator {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 1.25rem;
  margin-top: 1rem;
}
@media (max-width: 860px) {
  .generator { grid-template-columns: 1fr; }
  .nav-links { gap: .55rem; font-size: .85rem; }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}
.panel h2 { margin: 0 0 1rem; font-size: 1.15rem; }

.tabs {
  display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1rem;
}
.tab {
  appearance: none; border: 1px solid var(--border); background: var(--card);
  color: var(--muted); border-radius: 999px; padding: .4rem .85rem;
  cursor: pointer; font: inherit; font-size: .85rem; font-weight: 600;
}
.tab.active, .tab:hover {
  color: var(--bg); background: var(--primary); border-color: var(--primary);
}

.field { margin-bottom: .9rem; }
.field label {
  display: block; font-size: .82rem; color: var(--muted); margin-bottom: .35rem; font-weight: 600;
}
.field input, .field textarea, .field select {
  width: 100%; border-radius: 10px; border: 1px solid var(--border);
  background: var(--card); color: var(--text); padding: .7rem .85rem;
  font: inherit; outline: none;
}
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(61,214,198,.18);
}
.field textarea { min-height: 96px; resize: vertical; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
@media (max-width: 520px) { .row-2 { grid-template-columns: 1fr; } }

.hint { font-size: .78rem; color: var(--muted); margin-top: .35rem; }
.error { color: var(--danger); font-size: .85rem; margin-top: .5rem; display: none; }
.error.show { display: block; }

.actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: .5rem; }
.btn {
  appearance: none; border: none; cursor: pointer;
  background: var(--primary); color: #04221f; font-weight: 700;
  border-radius: 10px; padding: .7rem 1rem; font: inherit; font-size: .92rem;
}
.btn:hover { background: var(--primary-dark); }
.btn.secondary {
  background: transparent; color: var(--text);
  border: 1px solid var(--border);
}
.btn.secondary:hover { border-color: var(--primary); color: var(--primary); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.preview-wrap {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 360px; text-align: center; gap: 1rem;
}
#qr-canvas {
  width: min(280px, 80vw); height: auto;
  background: #fff; border-radius: 12px; padding: 12px;
  box-shadow: var(--shadow);
}
.preview-empty {
  color: var(--muted); font-size: .95rem; padding: 2rem 1rem;
}
.privacy-note {
  margin-top: 1rem; padding: .85rem 1rem;
  background: rgba(74,222,128,.08); border: 1px solid rgba(74,222,128,.25);
  border-radius: 10px; color: #b7f5cd; font-size: .88rem;
}

.section-title { margin: 2.2rem 0 1rem; font-size: 1.35rem; }
.feature-grid, .guide-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem;
}
.feature-card, .guide-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.1rem;
}
.feature-card h3, .guide-card h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.feature-card p, .guide-card p { margin: 0; color: var(--muted); font-size: .92rem; }
.guide-card a { font-weight: 700; display: inline-block; margin-top: .7rem; }

.prose {
  max-width: 760px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem;
}
.prose h1 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin-bottom: .5rem; }
.prose h2 { margin-top: 1.8rem; font-size: 1.25rem; }
.prose p, .prose li { color: #c8d4eb; }
.prose ul { padding-left: 1.2rem; }
.prose .meta { color: var(--muted); font-size: .9rem; margin-bottom: 1.5rem; }

.site-footer {
  border-top: 1px solid var(--border); margin-top: 2rem;
  padding: 1.5rem 1.25rem 2.5rem; color: var(--muted); font-size: .88rem;
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between;
}
.footer-links { display: flex; flex-wrap: wrap; gap: .85rem; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--primary); }