:root {
  --bg: #020617;
  --panel: #020617;
  --accent: #22d3ee;
  --accent-soft: rgba(34, 211, 238, 0.18);
  --text: #f9fafb;
  --muted: #9ca3af;
  --border-subtle: rgba(148, 163, 184, 0.35);
  --radius-lg: 18px;
  --radius-md: 12px;
  --shadow-soft: 0 22px 60px rgba(15, 23, 42, 0.85);
  --transition-fast: 0.18s ease-out;
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, #1e293b 0, #020617 45%, #000 100%);
  color: var(--text);
  min-height: 100vh;
}

/* HEADER */

.header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 6vw;
  background: linear-gradient(
    to bottom,
    rgba(2, 6, 23, 0.96),
    rgba(2, 6, 23, 0.7)
  );
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.logo {
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.9rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: radial-gradient(circle at top left, #22d3ee 0, #020617 60%);
}

.nav-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* LAYOUT */

.main {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.2fr);
  gap: 2rem;
  padding: 2rem 6vw 3rem;
  align-items: flex-start;
}

.controls-panel {
  background: radial-gradient(circle at top left, #020617 0, #020617 70%);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.7rem 1.8rem;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
}

.controls-panel h1 {
  font-size: 1.7rem;
  margin: 0 0 0.4rem;
}

.subtitle {
  margin: 0 0 1.4rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.control-group {
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.3);
  padding: 1rem 1rem 1.1rem;
  margin-bottom: 1rem;
  background: rgba(15, 23, 42, 0.9);
}

.control-group h2 {
  font-size: 1rem;
  margin: 0 0 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.7rem;
}

.row label {
  flex: 0 0 120px;
  font-size: 0.85rem;
  color: var(--muted);
}

.row input[type="text"],
.row select,
.row input[type="file"] {
  flex: 1;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.95);
  color: var(--text);
  padding: 0.45rem 0.7rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast), background var(--transition-fast);
}

.row input[type="file"] {
  padding: 0.3rem 0.7rem;
}

.row input[type="text"]:focus,
.row select:focus,
.row input[type="file"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
}

.row input[type="color"] {
  width: 46px;
  height: 28px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: transparent;
  padding: 0;
}

.row input[type="range"] {
  flex: 1;
}

.row span {
  font-size: 0.8rem;
  color: var(--muted);
}

.toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.toggle-row label {
  flex: 0 0 auto;
  font-size: 0.8rem;
  color: var(--muted);
}

/* BUTTONS */

.btn {
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  padding: 0.55rem 1.3rem;
  font-size: 0.85rem;
  cursor: pointer;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: transparent;
  color: var(--muted);
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast), background var(--transition-fast),
    color var(--transition-fast), border-color var(--transition-fast);
}

.btn.primary {
  background: linear-gradient(135deg, #22d3ee, #4f46e5);
  color: #020617;
  border-color: transparent;
  box-shadow: 0 14px 35px rgba(34, 211, 238, 0.4);
}

.btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 45px rgba(34, 211, 238, 0.6);
}

.btn.ghost {
  background: transparent;
  color: var(--muted);
}

.btn.ghost:hover {
  background: rgba(15, 23, 42, 0.9);
  color: var(--text);
}

.btn.small {
  padding: 0.35rem 0.9rem;
  font-size: 0.75rem;
}

/* PREVIEW PANEL */

.preview-panel {
  background: radial-gradient(circle at top right, #020617 0, #020617 70%);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.7rem 1.8rem;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.preview-header h2 {
  margin: 0;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.preview-size-label {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.canvas-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1.2rem;
  border-radius: var(--radius-md);
  background: radial-gradient(circle at top, #020617 0, #000 80%);
  border: 1px dashed rgba(148, 163, 184, 0.4);
}

#stickerCanvas {
  background: transparent;
}

/* LAYERS PANEL */

.layers-panel {
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(15, 23, 42, 0.9);
  padding: 0.7rem 0.8rem;
}

.layers-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

.layers-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 180px;
  overflow-y: auto;
}

.layers-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
  cursor: pointer;
  color: var(--muted);
}

.layers-list li span {
  pointer-events: none;
}

.layers-list li.active {
  background: rgba(34, 211, 238, 0.12);
  color: var(--text);
}

.layers-list li:hover {
  background: rgba(15, 23, 42, 0.9);
}

/* HISTORY BUTTONS */

.history-buttons {
  display: flex;
  gap: 0.4rem;
}

/* FOOTER */

.footer {
  padding: 1.4rem 6vw 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid rgba(148, 163, 184, 0.25);
}

/* SMALL TEXT */

.hint {
  margin: 0 0 0.6rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.preview-note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* RESPONSIVE */

@media (max-width: 960px) {
  .main {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .header {
    padding-inline: 4vw;
  }

  .main {
    padding-inline: 4vw;
  }

  .footer {
    padding-inline: 4vw;
  }

  .row {
    flex-wrap: wrap;
  }

  .row label {
    flex: 0 0 100%;
  }
}