:root {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-elevated: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --accent: #0284c7;
  --accent-hover: #0369a1;
  --accent-soft: rgba(2, 132, 199, 0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
  --font: "DM Sans", system-ui, sans-serif;
  --font-display: "Syne", var(--font);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 120% 80% at 100% -20%, rgba(2, 132, 199, 0.08), transparent),
    radial-gradient(ellipse 80% 60% at 0% 100%, rgba(14, 165, 233, 0.06), transparent);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
  left: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.55rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.brand__mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #0ea5e9);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
  position: relative;
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 2px solid rgba(255, 255, 255, 0.95);
  border-radius: 4px;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(255, 255, 255, 0.35) 3px,
    rgba(255, 255, 255, 0.35) 4px
  );
}

.brand__text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.site-header__tagline {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr min(420px, 38vw);
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

.preview-panel__sticky {
  position: sticky;
  top: 4.25rem;
}

@media (max-width: 960px) {
  .preview-panel__sticky {
    position: static;
  }
}

.preview-card {
  background: var(--surface-elevated);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: card-in 0.5s ease-out both;
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.preview-card__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #fafbfc, #fff);
}

.preview-card__label {
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.preview-card__hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.preview-card__stage {
  padding: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 260px;
  background:
    linear-gradient(90deg, var(--border) 1px, transparent 1px),
    linear-gradient(var(--border) 1px, transparent 1px);
  background-size: 20px 20px;
  background-color: #f8fafc;
}

#composite-canvas {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.12);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.preview-card__stage:hover #composite-canvas {
  transform: scale(1.01);
  box-shadow: 0 16px 48px rgba(15, 23, 42, 0.14);
}

.preview-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.65rem 1rem 0.85rem;
  border-top: 1px solid var(--border);
  background: #fff;
}

.controls-panel {
  animation: card-in 0.55s ease-out 0.05s both;
}

.control-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.control-form--compact {
  gap: 0.45rem;
}

.control-block {
  margin: 0;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.control-form--compact .control-block {
  padding: 0.5rem 0.65rem;
  border-radius: 10px;
}

.control-block legend {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  padding: 0 0.35rem;
  margin-left: -0.15rem;
}

.control-form--compact .control-block legend {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  font-weight: 700;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: 0.85rem;
}

.field--flush {
  margin-top: 0.35rem;
}

.field--flush:first-child {
  margin-top: 0.15rem;
}

.field:first-of-type {
  margin-top: 0.5rem;
}

.control-form--compact .field:first-of-type {
  margin-top: 0.15rem;
}

.control-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem 0.5rem;
  align-items: end;
}

.field--span-2 {
  grid-column: span 2;
}

@media (max-width: 960px) {
  .control-grid-2 {
    grid-template-columns: 1fr;
  }
  .field--span-2 {
    grid-column: span 1;
  }
}

.field--compact {
  flex: 0 0 auto;
}

.field--grow {
  flex: 1;
  min-width: 0;
}

.field__label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
}

.control-form--compact .field__label {
  font-size: 0.7rem;
}

.field-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.75rem;
  margin-top: 0.85rem;
}

.field-row .field {
  margin-top: 0;
}

.field-row--tight {
  gap: 0.45rem;
  margin-top: 0.35rem;
}

input[type="text"],
input[type="file"],
textarea,
select {
  font: inherit;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.55rem;
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

textarea {
  resize: vertical;
  min-height: 52px;
}

input[type="color"] {
  width: 100%;
  height: 30px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  background: #fff;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font: inherit;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 0.95rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  flex: 1;
  min-width: 140px;
}

.btn--primary:hover {
  background: var(--accent-hover);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

.btn--small {
  padding: 0.45rem 0.75rem;
  font-size: 0.8125rem;
  align-self: center;
}

.qr-host {
  position: fixed;
  left: -9999px;
  top: 0;
  width: 400px;
  height: 400px;
  overflow: hidden;
  pointer-events: none;
  opacity: 0.01;
}