/* ─── CSS custom properties ──────────────────────────────────────────────── */

:root {
  --bg:          #1a1a2e;
  --surface:     #16213e;
  --surface2:    #0f3460;
  --accent:      #e94560;
  --accent2:     #533483;
  --text:        #eaeaea;
  --text-muted:  #9aa3b2;
  --border:      #2a3050;
  --input-bg:    #0f1928;
  --radius:      8px;
  --radius-sm:   4px;
  --shadow:      0 2px 12px rgba(0,0,0,.4);
  --transition:  0.2s ease;
}

[data-theme="light"] {
  --bg:          #f5f7fa;
  --surface:     #ffffff;
  --surface2:    #e8edf5;
  --accent:      #d63051;
  --accent2:     #7c4daa;
  --text:        #1a1a2e;
  --text-muted:  #6b7280;
  --border:      #d1d5db;
  --input-bg:    #f0f4f8;
  --shadow:      0 2px 8px rgba(0,0,0,.1);
}

/* ─── Reset & base ───────────────────────────────────────────────────────── */

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

body {
  font-family: system-ui, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  font-size: 14px;
}

/* ─── Header ─────────────────────────────────────────────────────────────── */

.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-inner h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: background var(--transition);
}

.icon-btn:hover { background: var(--accent2); color: #fff; }

/* ─── Main layout ────────────────────────────────────────────────────────── */

.app-main {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 20px;
  max-width: 1280px;
  margin: 20px auto;
  padding: 0 20px;
  align-items: start;
}

@media (max-width: 768px) {
  .app-main { grid-template-columns: 1fr; }
}

/* ─── Control panel ──────────────────────────────────────────────────────── */

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.control-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.section-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.row-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 8px;
}

.field:last-child { margin-bottom: 0; }

label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

input[type="number"],
input[type="text"],
select,
textarea {
  background: var(--input-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  font-size: 0.85rem;
  width: 100%;
  outline: none;
  transition: border-color var(--transition);
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
}

textarea {
  resize: vertical;
  font-family: monospace;
  font-size: 0.7rem;
  margin-bottom: 6px;
}

.color-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

input[type="color"] {
  width: 36px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
  padding: 2px;
  flex-shrink: 0;
}

.hex-input { flex: 1; }

/* ─── Buttons ────────────────────────────────────────────────────────────── */

.primary-btn {
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter var(--transition);
}

.primary-btn:hover { filter: brightness(1.15); }

.secondary-btn {
  width: 100%;
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background var(--transition);
}

.secondary-btn:hover { background: var(--accent2); color: #fff; }

.action-section { padding: 10px 14px; }

/* ─── Preview panel ──────────────────────────────────────────────────────── */

.preview-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  min-height: 300px;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.drag-hint {
  font-size: 0.7rem;
  color: var(--accent);
  opacity: 0.8;
}

.canvas-wrapper {
  overflow: auto;
  border-radius: var(--radius-sm);
  background:
    repeating-conic-gradient(#808080 0% 25%, transparent 0% 50%) 0 0 / 16px 16px;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  min-height: 200px;
}

#preview-canvas {
  display: block;
  cursor: se-resize;
  max-width: 100%;
  image-rendering: pixelated;
  user-select: none;
}

#preview-canvas.dragging { cursor: se-resize; }

/* ─── Presets ────────────────────────────────────────────────────────────── */

.presets-section,
.bulk-section {
  max-width: 1280px;
  margin: 0 auto 24px;
  padding: 0 20px;
}

.section-heading {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.preset-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-btn {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: background var(--transition), border-color var(--transition);
  min-width: 96px;
}

.preset-btn:hover {
  background: var(--surface2);
  border-color: var(--accent);
}

.preset-name {
  font-size: 0.75rem;
  font-weight: 600;
}

.preset-dim {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* ─── Bulk ───────────────────────────────────────────────────────────────── */

.bulk-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.bulk-controls label {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.bulk-controls select {
  max-width: 220px;
}

.bulk-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.bulk-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}

.bulk-dl-btn {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  cursor: pointer;
  font-size: 0.75rem;
  transition: background var(--transition);
}

.bulk-dl-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ─── Footer ─────────────────────────────────────────────────────────────── */

.app-footer {
  text-align: center;
  padding: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 16px;
}

.app-footer a {
  color: var(--accent);
  text-decoration: none;
}

.app-footer a:hover { text-decoration: underline; }