/* =========================================================
   SCANLINE — QR Code Generator
   Design tokens
   ========================================================= */
:root{
  --ink: #14161A;
  --ink-soft: #40434B;
  --paper: #F7F6F1;
  --paper-alt: #EEEBE2;
  --card: #FFFFFF;
  --line: #E1DDD2;
  --line-strong: #C9C4B6;
  --muted: #767A82;
  --amber: #FFB800;
  --amber-ink: #7A5B00;
  --teal: #0EA5A0;
  --danger: #D8432E;

  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;
  --shadow-card: 0 2px 4px rgba(20,22,26,0.04), 0 12px 28px -14px rgba(20,22,26,0.18);
  --transition: 180ms cubic-bezier(.4,0,.2,1);
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap{
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3{
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}

a{ color: var(--ink); }

:focus-visible{
  outline: 2.5px solid var(--amber-ink);
  outline-offset: 2px;
  border-radius: 4px;
}

/* =========================================================
   Header
   ========================================================= */
.site-header{
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(6px);
}
.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
  gap: 16px;
  flex-wrap: wrap;
}
.brand{
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
}
.brand-mark{ color: var(--ink); display: inline-flex; }
.header-tag{
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
}

/* =========================================================
   Hero
   ========================================================= */
.hero{
  padding: 56px 24px 40px;
}
.eyebrow{
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--amber-ink);
  background: rgba(255,184,0,0.16);
  display: inline-block;
  padding: 4px 10px;
  border-radius: 100px;
  margin: 0 0 18px;
}
.hero h1{
  font-size: clamp(30px, 4.6vw, 48px);
  line-height: 1.08;
  max-width: 15ch;
}
.hero-sub{
  max-width: 52ch;
  color: var(--ink-soft);
  font-size: 16px;
  margin: 18px 0 0;
}

/* =========================================================
   Preset chips
   ========================================================= */
.generator{ padding-bottom: 64px; }

.preset-bar{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.preset-chip{
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--card);
  border: 1px solid var(--line);
  padding: 9px 14px;
  border-radius: 100px;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition), transform var(--transition);
}
.preset-chip svg{ flex-shrink: 0; }
.preset-chip:hover{ border-color: var(--line-strong); transform: translateY(-1px); }
.preset-chip.is-active{
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

/* =========================================================
   Generator grid
   ========================================================= */
.generator-grid{
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
  align-items: start;
}
@media (max-width: 860px){
  .generator-grid{ grid-template-columns: 1fr; }
}

.panel{
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
  padding: 28px;
}
@media (max-width: 520px){
  .panel{ padding: 20px; }
}

/* Form fields */
.field-stack{ display: flex; flex-direction: column; gap: 16px; }
.field{ display: flex; flex-direction: column; gap: 7px; }
.field-row{ margin-top: 18px; }
.field-row.two-col{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 420px){
  .field-row.two-col{ grid-template-columns: 1fr; }
}

label{
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}
.field-hint{
  font-weight: 400;
  font-size: 12px;
  color: var(--muted);
}

input[type="text"],
input[type="tel"],
input[type="email"],
input[type="password"],
textarea,
select{
  font-family: var(--font-body);
  font-size: 14.5px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  padding: 11px 13px;
  width: 100%;
  transition: border-color var(--transition), background var(--transition);
}
textarea{ resize: vertical; min-height: 76px; font-family: var(--font-body); }
input:focus, textarea:focus, select:focus{
  border-color: var(--ink);
  background: var(--card);
}
input.field-invalid{ border-color: var(--danger); }

.mono-input{ font-family: var(--font-mono); font-size: 13px; text-transform: uppercase; }

@keyframes shake{
  0%, 100%{ transform: translateX(0); }
  20%{ transform: translateX(-6px); }
  40%{ transform: translateX(6px); }
  60%{ transform: translateX(-4px); }
  80%{ transform: translateX(4px); }
}
#qr-form.shake{ animation: shake 320ms ease-in-out; }

.field-error{
  color: var(--danger);
  font-size: 13px;
  font-weight: 600;
  margin: -4px 0 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.divider{
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 24px 0 4px;
}
.divider::after{
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* Range slider */
input[type="range"]{
  width: 100%;
  accent-color: var(--ink);
  height: 4px;
}

/* Color pickers */
.color-field{
  display: flex;
  align-items: center;
  gap: 8px;
}
input[type="color"]{
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: none;
  cursor: pointer;
  flex-shrink: 0;
}

/* Logo upload */
.logo-upload-row{
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.file-btn{
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  font-weight: 600;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  cursor: pointer;
  background: var(--paper);
  transition: border-color var(--transition);
}
.file-btn:hover{ border-color: var(--line-strong); }
.logo-filename{ font-size: 12.5px; color: var(--muted); }
.text-btn{
  background: none;
  border: none;
  color: var(--danger);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}

/* Buttons */
.button-row{ display: flex; gap: 10px; margin-top: 22px; flex-wrap: wrap; }
.btn{
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 14px;
  padding: 12px 20px;
  border-radius: var(--radius-s);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), opacity var(--transition);
}
.btn:active{ transform: translateY(1px); }
.btn:disabled{ opacity: 0.45; cursor: not-allowed; }

.btn-primary{
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover:not(:disabled){ background: #262931; }

.btn-secondary{
  background: var(--amber);
  color: var(--ink);
}
.btn-secondary:hover:not(:disabled){ background: #e8a800; }

.btn-ghost{
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--line);
}
.btn-ghost:hover{ border-color: var(--line-strong); }

.btn-outline{
  background: var(--card);
  color: var(--ink);
  border-color: var(--line);
  width: 100%;
  justify-content: center;
}
.btn-outline:hover:not(:disabled){ border-color: var(--line-strong); }
.btn-outline.is-copied{ background: var(--teal); color: #fff; border-color: var(--teal); }

/* =========================================================
   Preview panel — viewfinder signature
   ========================================================= */
.preview-panel{ display: flex; flex-direction: column; gap: 16px; }

.preview-frame{
  position: relative;
  background: var(--paper-alt);
  border-radius: var(--radius-m);
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 24px;
}

.corner{
  position: absolute;
  width: 22px;
  height: 22px;
  border: 2px solid var(--ink);
  opacity: 0.35;
  pointer-events: none;
  transition: opacity var(--transition), border-color var(--transition);
}
.corner-tl{ top: 12px; left: 12px; border-right: none; border-bottom: none; border-radius: 4px 0 0 0; }
.corner-tr{ top: 12px; right: 12px; border-left: none; border-bottom: none; border-radius: 0 4px 0 0; }
.corner-bl{ bottom: 12px; left: 12px; border-right: none; border-top: none; border-radius: 0 0 0 4px; }
.corner-br{ bottom: 12px; right: 12px; border-left: none; border-top: none; border-radius: 0 0 4px 0; }

.preview-frame.is-active .corner{ opacity: 0.9; border-color: var(--amber-ink); }

.preview-empty{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  text-align: center;
}
.preview-empty p{ margin: 0; font-size: 13.5px; }

#qr-canvas{
  max-width: 100%;
  max-height: 100%;
  border-radius: 6px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

.scanline{
  position: absolute;
  left: 8%;
  right: 8%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
  top: 10%;
  opacity: 0;
  pointer-events: none;
}
.scanline.is-sweeping{
  animation: sweep 900ms ease-in-out 1;
  opacity: 1;
}
@keyframes sweep{
  0%{ top: 8%; opacity: 0; }
  15%{ opacity: 1; }
  85%{ opacity: 1; }
  100%{ top: 88%; opacity: 0; }
}

.scan-note{
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  color: var(--amber-ink);
  background: rgba(255,184,0,0.14);
  border-radius: var(--radius-s);
  padding: 9px 12px;
  margin: 0;
}

.preview-actions{ display: flex; }

.download-row{
  border-top: 1px solid var(--line);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.download-label{ margin-bottom: -2px; }

/* =========================================================
   Printing notes
   ========================================================= */
.print-notes{ padding: 20px 24px 72px; }
.print-notes h2{
  font-size: clamp(24px, 3vw, 32px);
  margin: 6px 0 28px;
}

.notes-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
@media (max-width: 860px){ .notes-grid{ grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px){ .notes-grid{ grid-template-columns: 1fr; } }

.note-card{
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 20px;
}
.note-num{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber-ink);
  background: rgba(255,184,0,0.16);
  padding: 3px 8px;
  border-radius: 100px;
  display: inline-block;
  margin-bottom: 12px;
}
.note-card h3{ font-size: 15.5px; margin-bottom: 8px; }
.note-card p{ font-size: 13.5px; color: var(--ink-soft); margin: 0; }

.print-warning{
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 24px 0 0;
  padding: 16px 18px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-m);
  font-size: 13.5px;
}
.print-warning svg{ flex-shrink: 0; margin-top: 1px; color: var(--amber); }

/* =========================================================
   Footer
   ========================================================= */
.site-footer{
  border-top: 1px solid var(--line);
  padding: 32px 24px 40px;
  color: var(--muted);
}
.footer-inner{ display: flex; flex-direction: column; gap: 6px; }
.footer-inner .brand{ font-size: 15px; color: var(--ink); margin-bottom: 4px; }
.footer-inner p{ margin: 0; font-size: 13px; }
.footer-credit a{ color: var(--ink-soft); }