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

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --surface2: #1a1a1a;
  --border: rgba(255,255,255,0.08);
  --accent: #ff5a1f;
  --accent2: #ff8c00;
  --text: #f0ece0;
  --text-dim: #a0a09a;
  --text-mid: #c8c8c0;
  --font-display: 'Inter', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --radius: 4px;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-display);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 128px;
}

header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 32px 48px;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
}

.accent { color: var(--accent); }

.tagline {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

main {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  padding: 80px 48px 60px;
}

.hero {
  margin-bottom: 64px;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--text);
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.sub {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-mid);
  max-width: 420px;
  line-height: 1.7;
  letter-spacing: 0.01em;
}

.generator {
  margin-bottom: 80px;
}

.input-row {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  transition: border-color var(--transition);
}

.input-row:focus-within {
  border-color: var(--accent);
}

#urlInput {
  flex: 1;
  padding: 18px 24px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}

#urlInput::placeholder {
  color: var(--text-dim);
}

#generateBtn {
  padding: 18px 32px;
  background: var(--accent);
  color: #ffffff;
  border: none;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
}

#generateBtn:hover {
  background: #ff7a45;
}

#generateBtn:active {
  transform: scale(0.98);
}

#generateBtn:disabled {
  background: var(--border);
  color: var(--text-dim);
  cursor: not-allowed;
}

.error-msg {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent2);
  margin-top: 10px;
  min-height: 18px;
  letter-spacing: 0.02em;
}

.result {
  display: flex;
  align-items: center;
  gap: 48px;
  margin-top: 48px;
  padding: 40px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  animation: fadeSlideUp 0.35s ease both;
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hidden { display: none !important; }

.qr-frame {
  position: relative;
  flex-shrink: 0;
  padding: 12px;
  background: #fff;
  border-radius: var(--radius);
}

.qr-corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border-color: var(--accent);
  border-style: solid;
}

.qr-corner.tl { top: -4px; left: -4px; border-width: 2px 0 0 2px; }
.qr-corner.tr { top: -4px; right: -4px; border-width: 2px 2px 0 0; }
.qr-corner.bl { bottom: -4px; left: -4px; border-width: 0 0 2px 2px; }
.qr-corner.br { bottom: -4px; right: -4px; border-width: 0 2px 2px 0; }

#qrImage {
  display: block;
  width: 160px;
  height: 160px;
  image-rendering: pixelated;
}

.result-meta {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.meta-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.redirect-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  word-break: break-all;
  text-decoration: none;
  line-height: 1.5;
  border-bottom: 1px dashed var(--accent);
  padding-bottom: 2px;
  transition: opacity var(--transition);
}

.redirect-link:hover { opacity: 0.75; }

.copy-btn {
  display: inline-block;
  padding: 10px 20px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-mid);
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: var(--radius);
  transition: border-color var(--transition), color var(--transition);
  width: fit-content;
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.copy-confirm {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.feature-card {
  background: var(--surface);
  padding: 32px 28px;
  transition: background var(--transition);
}

.feature-card:hover {
  background: var(--surface2);
}

.feature-icon {
  font-size: 1.4rem;
  margin-bottom: 16px;
  color: var(--accent);
  line-height: 1;
}

.feature-title {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  color: var(--text);
}

.feature-desc {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text-dim);
  line-height: 1.65;
}

footer {
  position: relative;
  z-index: 1;
  padding: 24px 48px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

@media (max-width: 640px) {
  header { padding: 20px 24px; flex-wrap: wrap; gap: 8px; }
  main { padding: 48px 24px 40px; }
  .hero h1 { font-size: 2.4rem; }
  .result { flex-direction: column; gap: 32px; padding: 28px 24px; }
  .features { grid-template-columns: 1fr; }
  footer { padding: 20px 24px; }
}