/* ===== QR KÓD GENERÁTOR ===== */

:root {
  --bg:           #08080F;
  --surface:      #0F0F1A;
  --surface2:     #14141F;
  --border:       rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.14);
  --accent:       #8B7FF5;
  --accent-glow:  rgba(139,127,245,0.18);
  --text:         #E8E8F5;
  --muted:        rgba(232,232,245,0.45);
  --danger:       rgba(245,100,100,0.9);
  --danger-bg:    rgba(245,100,100,0.08);
  --success:      rgba(100,220,130,0.9);
  --t:            0.2s;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── BACK BUTTON ── */
.back {
  position: fixed;
  top: 1.25rem;
  left: 1.5rem;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t);
  letter-spacing: 0.02em;
}
.back:hover { color: var(--text); }
.back svg { opacity: 0.7; transition: opacity var(--t); }
.back:hover svg { opacity: 1; }

/* ── HERO ── */
.hero {
  min-height: 55vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 7rem 1.5rem 4rem;
  text-align: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% 55%, rgba(139,127,245,0.13) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 50% 85%, rgba(139,127,245,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(139,127,245,0.07) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black 0%, transparent 70%);
  mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black 0%, transparent 70%);
  pointer-events: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(139,127,245,0.25);
  border-radius: 50px;
  padding: 0.35rem 1rem;
  margin-bottom: 1.4rem;
  background: rgba(139,127,245,0.07);
  animation: fade-up 0.8s cubic-bezier(.16,1,.3,1) 0.3s both;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.7); }
}

.hero h1 {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(3.5rem, 11vw, 7.5rem);
  font-weight: 400;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 1.25rem;
  animation: fade-up 0.9s cubic-bezier(.16,1,.3,1) 0.45s both;
}

.hero h1 .line2 {
  font-style: italic;
  color: var(--accent);
}

.hero-subtitle {
  font-size: clamp(0.87rem, 2vw, 1rem);
  color: var(--muted);
  max-width: 440px;
  line-height: 1.7;
  animation: fade-up 0.9s cubic-bezier(.16,1,.3,1) 0.6s both;
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── MAIN / CONTAINER ── */
main {
  padding-bottom: 5rem;
}

.container {
  max-width: 640px;
  margin-inline: auto;
  padding: 0 1.5rem;
}

/* ── CARDS ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 30px;
  margin-bottom: 16px;
  animation: fade-up 0.65s cubic-bezier(.16,1,.3,1) both;
}

.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.15s; }
.card:nth-child(3) { animation-delay: 0.25s; }

/* ── TABS ── */
.tab-row {
  display: flex;
  gap: 4px;
  background: var(--surface2);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 22px;
}

.tab-btn {
  flex: 1;
  border: none;
  border-radius: 9px;
  padding: 9px 0;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  background: transparent;
  color: var(--muted);
  transition: background var(--t), color var(--t);
}

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

.tab-btn:not(.active):hover {
  color: var(--text);
}

/* ── TAB PANELS ── */
.tab-panel.hidden { display: none; }

/* ── LABELS ── */
.field-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

/* ── TEXTAREA ── */
textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  resize: vertical;
  outline: none;
  transition: border-color var(--t), box-shadow var(--t);
  min-height: 90px;
}

textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea::placeholder { color: var(--muted); }

/* ── CHAR COUNT ── */
.char-count {
  text-align: right;
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 6px;
  transition: color var(--t);
}

.char-count.near-limit { color: rgba(230,160,40,0.9); }
.char-count.at-limit   { color: var(--danger); }

/* ── URL INPUT ── */
.url-input-wrap {
  display: flex;
  align-items: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color var(--t), box-shadow var(--t);
}

.url-input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.url-prefix {
  padding: 12px 0 12px 16px;
  font-size: 0.9rem;
  color: var(--muted);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

.url-input-wrap input[type="text"] {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  padding: 12px 16px 12px 4px;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
}

.url-input-wrap input[type="text"]::placeholder { color: var(--muted); }

/* ── URL HINT ── */
.url-hint {
  font-size: 0.78rem;
  margin-top: 6px;
  min-height: 1.2em;
  color: transparent;
  transition: color var(--t);
}

.url-hint.valid   { color: var(--success); }
.url-hint.invalid { color: var(--danger); }

/* ── ERROR BANNER ── */
.error-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--danger-bg);
  border: 1px solid rgba(245,100,100,0.2);
  border-radius: 10px;
  padding: 10px 14px;
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 14px;
}

.error-banner.hidden { display: none; }

/* ── CUSTOMIZATION CARD ── */
.card-section-title {
  font-family: 'Instrument Serif', serif;
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.option-group {
  margin-bottom: 22px;
}

.option-group:last-child { margin-bottom: 0; }

.option-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

/* ── BUTTON GROUPS ── */
.btn-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.style-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 16px;
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--t), color var(--t), background var(--t);
}

.style-btn:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

.style-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.size-hint {
  font-size: 0.7rem;
  opacity: 0.6;
}

/* ── COLOR PICKERS ── */
.color-row {
  display: flex;
  align-items: flex-end;
  gap: 12px;
}

.color-field {
  flex: 1;
}

.color-swatch-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  transition: border-color var(--t);
}

.color-swatch-wrap:hover {
  border-color: var(--border-hover);
}

input[type="color"] {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  padding: 0;
  background: none;
  -webkit-appearance: none;
  appearance: none;
}

input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch {
  border-radius: 4px;
  border: 1px solid var(--border);
}

.color-value {
  font-size: 0.8rem;
  font-family: 'Courier New', monospace;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.swap-btn {
  width: 38px;
  height: 38px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--muted);
  flex-shrink: 0;
  transition: border-color var(--t), color var(--t), transform 0.35s ease;
  align-self: flex-end;
  margin-bottom: 2px;
}

.swap-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(180deg);
}

/* ── OUTPUT / PREVIEW ── */
.qr-preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  padding: 16px 0 20px;
}

.qr-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  text-align: center;
}

.qr-empty.hidden { display: none; }

.empty-icon {
  width: 64px;
  height: 64px;
  opacity: 0.25;
}

.qr-empty p {
  font-size: 0.87rem;
  max-width: 240px;
  line-height: 1.65;
}

#qrCanvas {
  display: flex;
  align-items: center;
  justify-content: center;
}

#qrCanvas.hidden { display: none; }

#qrCanvas canvas,
#qrCanvas svg {
  display: block;
  max-width: 100%;
  transition: border-radius 0.25s ease;
}

/* ── ACTION BUTTONS ── */
.action-row {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 12px;
  font-family: 'Inter', sans-serif;
  font-size: 0.87rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--muted);
  transition: border-color var(--t), color var(--t), background var(--t), opacity var(--t);
}

.action-btn:hover:not(:disabled) {
  border-color: var(--border-hover);
  color: var(--text);
}

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

.action-btn.primary:hover:not(:disabled) {
  opacity: 0.88;
}

.action-btn:disabled {
  opacity: 0.32;
  cursor: not-allowed;
}

.action-btn.copied {
  background: rgba(100,220,130,0.1);
  border-color: rgba(100,220,130,0.35);
  color: var(--success);
}

/* ── FOOTER ── */
footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}

footer a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t);
}

footer a:hover { color: var(--text); }

/* ── RESPONSIVE ── */
@media (max-width: 520px) {
  .container { padding: 0 1rem; }

  .hero { padding: 6rem 1rem 3rem; min-height: 50vh; }

  .btn-group { gap: 6px; }

  .style-btn { padding: 8px 12px; font-size: 0.8rem; }

  .color-row { flex-wrap: wrap; }
  .color-field { min-width: 120px; }

  .action-row { flex-direction: column; }
  .action-btn { justify-content: center; }
}