/* ── Reset & Variables ────────────────────────────────────────────────────── */

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

:root {
  --ink: #0d0d0d;
  --paper: #f5f0e8;
  --accent: #ff4d00;
  --mid: #8c8070;
  --border: #1a1a1a;
}

/* ── Body & Background ────────────────────────────────────────────────────── */

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'DM Sans', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(0,0,0,0.04) 39px, rgba(0,0,0,0.04) 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(0,0,0,0.04) 39px, rgba(0,0,0,0.04) 40px);
  pointer-events: none;
  z-index: 0;
}

/* ── Card ─────────────────────────────────────────────────────────────────── */

.card {
  position: relative;
  z-index: 1;
  background: #fff;
  border: 2px solid var(--border);
  width: 100%;
  max-width: 480px;
  box-shadow: 6px 6px 0 var(--border);
}

.card-header {
  background: var(--ink);
  color: var(--paper);
  padding: 1.2rem 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  border-bottom: 2px solid var(--border);
}

.card-header h1 {
  font-family: 'Space Mono', monospace;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.badge {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  background: var(--accent);
  color: #fff;
  padding: 0.15rem 0.5rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 2px;
}

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

/* ── Form Elements ────────────────────────────────────────────────────────── */

label {
  font-size: 0.7rem;
  font-family: 'Space Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--mid);
  display: block;
  margin-bottom: 0.4rem;
}

input[type="text"] {
  width: 100%;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  border: 2px solid var(--border);
  padding: 0.65rem 0.8rem;
  outline: none;
  background: var(--paper);
  color: var(--ink);
  transition: border-color 0.15s, background 0.15s;
}

input[type="text"]:focus {
  background: #fff;
  border-color: var(--accent);
}

/* ── Color Pickers ────────────────────────────────────────────────────────── */

.color-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.color-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border: 2px solid var(--border);
  padding: 0.4rem 0.6rem;
  background: var(--paper);
}

input[type="color"] {
  width: 28px;
  height: 28px;
  border: none;
  background: none;
  cursor: pointer;
  padding: 0;
}

.color-hex {
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  color: var(--mid);
  flex: 1;
}

/* ── Size Slider ──────────────────────────────────────────────────────────── */

.size-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

.size-val {
  font-family: 'Space Mono', monospace;
  font-size: 0.8rem;
  color: var(--ink);
  min-width: 3rem;
  text-align: right;
}

/* ── Error Correction Buttons ─────────────────────────────────────────────── */

.ec-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.ec-btn {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  border: 2px solid var(--border);
  background: var(--paper);
  color: var(--ink);
  padding: 0.45rem 0;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: background 0.12s, color 0.12s;
  text-align: center;
}

.ec-btn:hover {
  background: var(--ink);
  color: var(--paper);
}

.ec-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── Generate Button ──────────────────────────────────────────────────────── */

.generate-btn {
  background: var(--ink);
  color: var(--paper);
  border: 2px solid var(--border);
  padding: 0.85rem 1rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  width: 100%;
  transition: background 0.15s, color 0.15s, transform 0.1s;
}

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

.generate-btn:active {
  transform: translate(2px, 2px);
}

/* ── Error Message ────────────────────────────────────────────────────────── */

.error-msg {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  color: var(--accent);
  text-align: center;
  display: none;
  padding: 0.5rem;
  border: 1px solid var(--accent);
  background: #fff5f0;
}

/* ── Divider ──────────────────────────────────────────────────────────────── */

.divider {
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--border) 0,
    var(--border) 4px,
    transparent 4px,
    transparent 8px
  );
  opacity: 0.3;
  margin: 0.2rem 0;
}

/* ── Output Section ───────────────────────────────────────────────────────── */

.output-section {
  border-top: 2px solid var(--border);
  padding: 1.5rem;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.output-section.visible {
  display: flex;
}

/* ── QR Frame ─────────────────────────────────────────────────────────────── */

.qr-frame {
  border: 2px solid var(--border);
  padding: 1rem;
  background: #fff;
  box-shadow: 4px 4px 0 var(--border);
  position: relative;
}

.qr-frame::before {
  content: '';
  position: absolute;
  top: -6px;
  left: -6px;
  right: -6px;
  bottom: -6px;
  border: 1px dashed var(--mid);
  pointer-events: none;
}

.corner {
  position: absolute;
  width: 10px;
  height: 10px;
  border-color: var(--accent);
  border-style: solid;
}

.corner.tl { top: 3px;    left: 3px;  border-width: 2px 0 0 2px; }
.corner.tr { top: 3px;    right: 3px; border-width: 2px 2px 0 0; }
.corner.bl { bottom: 3px; left: 3px;  border-width: 0 0 2px 2px; }
.corner.br { bottom: 3px; right: 3px; border-width: 0 2px 2px 0; }

/* ── QR Image ─────────────────────────────────────────────────────────────── */

#qrimg {
  display: block;
  max-width: 100%;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

/* ── Meta & Hint ──────────────────────────────────────────────────────────── */

.meta {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  color: var(--mid);
  text-align: center;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hint {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  color: var(--mid);
  text-align: center;
  line-height: 1.6;
}

/* ── Download Button ──────────────────────────────────────────────────────── */

.download-btn {
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--border);
  padding: 0.65rem 1.4rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background 0.12s, color 0.12s, transform 0.1s;
}

.download-btn:hover {
  background: var(--ink);
  color: var(--paper);
}

.download-btn:active {
  transform: translate(2px, 2px);
}

/* ── Error Correction Tooltip ─────────────────────────────────────────────── */

.ec-section {
  position: relative;
}

.ec-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}

.info-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1.5px solid var(--mid);
  background: transparent;
  color: var(--mid);
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  font-weight: 700;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  transition: border-color 0.12s, color 0.12s, background 0.12s;
  /* Reset label font styles since it inherits from label */
  text-transform: none;
  letter-spacing: 0;
}

.info-btn:hover,
.info-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.tooltip {
  display: none;
  position: relative;
  background: var(--ink);
  color: var(--paper);
  border: 2px solid var(--border);
  padding: 1rem 1rem 0.85rem;
  margin-bottom: 0.75rem;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.3);
}

.tooltip.visible {
  display: block;
}

.tooltip-close {
  position: absolute;
  top: 0.5rem;
  right: 0.6rem;
  background: none;
  border: none;
  color: var(--mid);
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  transition: color 0.12s;
}

.tooltip-close:hover {
  color: var(--paper);
}

.tooltip-title {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.tooltip-body {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  line-height: 1.5;
  color: #ccc;
  margin-bottom: 0.65rem;
}

.tooltip-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 0.65rem;
  padding: 0;
}

.tooltip-list li {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  line-height: 1.4;
  color: #ccc;
}

.tooltip-list li strong {
  font-family: 'Space Mono', monospace;
  color: var(--paper);
}

.tooltip-rec {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  color: var(--mid);
  border-top: 1px solid #333;
  padding-top: 0.6rem;
}

.tooltip-rec strong {
  color: var(--paper);
}