/* ── Reset & base ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-0:      #0d0d0f;
  --bg-1:      #161618;
  --bg-2:      #1c1c1e;
  --bg-3:      #242428;
  --border:    #2c2c32;
  --accent:    #4f7bff;
  --accent-h:  #6d94ff;
  --text-0:    #e8e8e8;
  --text-1:    #686878;
  --text-2:    #404050;
  --red:       #ff453a;
  --green:     #44cc88;
  --topbar-h:  38px;
  --strip-w:   40px;
  --nav-w:     162px;
  --panel-w:   218px;
  --preview-h: 110px;
}

html, body {
  height: 100%;
  background: var(--bg-0);
  color: var(--text-0);
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 13px;
  overflow: hidden;
}

/* ── App shell ────────────────────────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ── Top bar ──────────────────────────────────────────────────────────── */
#top-bar {
  display: flex;
  align-items: center;
  height: var(--topbar-h);
  padding: 0 10px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  user-select: none;
  gap: 6px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.app-title {
  font-weight: 700;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.01em;
}

.top-logo {
  height: 22px;
  width: auto;
  image-rendering: pixelated;
  display: block;
  opacity: 0.92;
}

.font-name-display {
  color: var(--text-1);
  font-size: 12px;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Main area ────────────────────────────────────────────────────────── */
#main-area {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Tool strip (vertical) ────────────────────────────────────────────── */
#tool-strip {
  width: var(--strip-w);
  flex-shrink: 0;
  background: var(--bg-1);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 0;
  gap: 1px;
  overflow-y: auto;
  overflow-x: hidden;
}

#tool-strip::-webkit-scrollbar { width: 0; }

.strip-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  width: 100%;
  padding: 0 4px;
}

.strip-sep {
  width: 50%;
  height: 1px;
  background: var(--border);
  margin: 4px 0;
  flex-shrink: 0;
}

/* Diamond layout for shift arrows */
.strip-arrows {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 0 2px;
}

.strip-lr {
  display: flex;
  gap: 0;
}

.strip-btn {
  width: 16px;
  height: 16px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  color: var(--text-1);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
}
.strip-btn svg { width: 11px; height: 11px; stroke-width: 2; }
.strip-btn:hover { background: var(--bg-3); color: var(--text-0); }

/* ── Character navigator ──────────────────────────────────────────────── */
#char-nav {
  width: var(--nav-w);
  flex-shrink: 0;
  background: var(--bg-1);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#char-nav-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

#char-nav-scroll::-webkit-scrollbar { width: 6px; }
#char-nav-scroll::-webkit-scrollbar-track { background: var(--bg-1); }
#char-nav-scroll::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px 6px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-1);
  z-index: 1;
}
.nav-title { font-weight: 600; font-size: 11px; color: var(--text-1); text-transform: uppercase; letter-spacing: 0.06em; }
.nav-count { color: var(--text-2); font-weight: 400; }

.glyph-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  padding: 5px;
}

.glyph-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  padding: 3px 2px;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.1s;
}
.glyph-thumb:hover  { background: var(--bg-3); }
.glyph-thumb.active { background: var(--bg-3); border-color: var(--accent); }
.glyph-thumb canvas { display: block; image-rendering: pixelated; }
.glyph-label {
  font-size: 9px;
  color: var(--text-2);
  text-align: center;
  line-height: 1;
  overflow: hidden;
  max-width: 30px;
  text-overflow: ellipsis;
}

/* ── Char nav footer ──────────────────────────────────────────────────── */
#char-nav-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  padding: 5px 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-1);
  min-height: 26px;
}

.nav-footer-cp  { font-size: 10px; color: var(--text-2); font-family: monospace; }
.nav-footer-ch  { font-size: 15px; color: var(--text-0); line-height: 1; min-width: 14px; text-align: center; }
.nav-footer-adv { font-size: 10px; color: var(--text-2); margin-left: auto; }

/* ── Editor area ──────────────────────────────────────────────────────── */
#editor-area {
  flex: 1;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
  overflow: hidden;
  background: var(--bg-0);
  position: relative;
}

#grid-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  image-rendering: pixelated;
}

/* ── Right panel (metrics) ────────────────────────────────────────────── */
#metrics-panel {
  width: var(--panel-w);
  flex-shrink: 0;
  background: var(--bg-1);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
}

#metrics-panel::-webkit-scrollbar { width: 6px; }
#metrics-panel::-webkit-scrollbar-track { background: var(--bg-1); }
#metrics-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.panel-section {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
}

.panel-title {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-2);
  margin-bottom: 7px;
}

.field-row {
  display: flex;
  align-items: center;
  margin-bottom: 4px;
  gap: 6px;
}
.field-label {
  flex: 0 0 84px;
  font-size: 11px;
  color: var(--text-1);
  text-align: right;
}
.field-input {
  flex: 1;
  background: var(--bg-0);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-0);
  padding: 3px 6px;
  font-size: 12px;
  min-width: 0;
}
.field-input:focus {
  outline: none;
  border-color: var(--accent);
}
.field-input[type="number"] { width: 52px; flex: none; }

.grid-size-row { display: flex; flex-direction: column; gap: 4px; }

.hint-text { font-size: 10px; color: var(--text-2); margin-top: 2px; }

.glyph-info-row {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-1);
  padding: 2px 0;
}
.glyph-info-char {
  font-size: 18px;
  line-height: 1;
  color: var(--text-0);
}

/* ── Preview bar ──────────────────────────────────────────────────────── */
#preview-bar {
  height: var(--preview-h);
  flex-shrink: 0;
  background: var(--bg-1);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px 10px 4px;
}

.preview-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.preview-label {
  font-size: 10px;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#preview-input {
  flex: 1;
  background: var(--bg-0);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-0);
  padding: 3px 8px;
  font-size: 13px;
}
#preview-input:focus { outline: none; border-color: var(--accent); }

#preview-scale {
  background: var(--bg-0);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-1);
  padding: 3px 6px;
  font-size: 12px;
}

#preview-canvas-wrap {
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
}
#preview-canvas-wrap::-webkit-scrollbar { height: 4px; }
#preview-canvas-wrap::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

#preview-canvas {
  display: block;
  image-rendering: pixelated;
}

/* ── Buttons ──────────────────────────────────────────────────────────── */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 4px 11px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--accent-h); }

.btn-secondary {
  background: var(--bg-3);
  color: var(--text-0);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 3px 9px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-secondary:hover { background: var(--bg-2); border-color: var(--accent); }

.btn-danger {
  background: transparent;
  color: var(--red);
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 3px 7px;
  font-size: 12px;
  cursor: pointer;
}
.btn-danger:hover { background: rgba(255,68,102,0.12); border-color: var(--red); }

.icon-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 5px;
  color: var(--text-1);
  font-size: 13px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
}
.icon-btn:hover   { background: var(--bg-3); color: var(--text-0); }
.icon-btn:disabled { opacity: 0.3; cursor: default; }

.tool-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 5px;
  font-size: 14px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.1s;
  color: var(--text-1);
}
.tool-btn:hover  { background: var(--bg-3); color: var(--text-0); }
.tool-btn.active { background: var(--accent); border-color: var(--accent-h); color: #fff; }

/* In the vertical strip, tool-btn should be slightly smaller */
#tool-strip .tool-btn {
  width: 28px;
  height: 28px;
}

.export-menu-wrap { display: flex; gap: 3px; }

/* ── Mini modal (add range) ───────────────────────────────────────────── */
.mini-modal {
  position: absolute;
  top: 38px;
  right: 4px;
  width: 190px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  z-index: 200;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}
.mini-modal-title { font-size: 11px; font-weight: 600; color: var(--text-1); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.05em; }
.mini-modal-close { position: absolute; top: 8px; right: 8px; }

.range-presets { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 8px; }
.preset-btn {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-1);
  font-size: 11px;
  padding: 3px 6px;
  cursor: pointer;
}
.preset-btn:hover { border-color: var(--accent); color: var(--text-0); }

.range-custom { display: flex; flex-direction: column; gap: 6px; }
.range-custom label { font-size: 11px; color: var(--text-1); }
.range-custom input { background: var(--bg-0); border: 1px solid var(--border); border-radius: 3px; color: var(--text-0); padding: 2px 4px; font-size: 11px; font-family: monospace; }

/* ── Full modal (library, help) ───────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
}

.modal-box {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 480px;
  max-width: 95vw;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}
.modal-box--narrow { width: 340px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.modal-title { font-weight: 600; font-size: 14px; }

.modal-body {
  overflow-y: auto;
  padding: 12px 16px;
  flex: 1;
}

.library-actions { display: flex; gap: 8px; margin-bottom: 12px; }

.library-empty { color: var(--text-2); text-align: center; padding: 24px 0; font-size: 13px; }

.library-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 6px;
  margin-bottom: 4px;
  background: var(--bg-3);
  border: 1px solid var(--border);
}
.library-item:hover { border-color: var(--accent); }
.library-item-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.library-item-name { font-size: 13px; font-weight: 500; color: var(--text-0); }
.library-item-meta { font-size: 11px; color: var(--text-2); }
.library-item-actions { display: flex; gap: 4px; flex-shrink: 0; }

/* ── Shortcuts help ───────────────────────────────────────────────────── */
.shortcuts-list { display: flex; flex-direction: column; gap: 2px; }
.shortcut-row { display: flex; align-items: center; gap: 10px; padding: 4px 0; border-bottom: 1px solid var(--bg-3); }
.shortcut-row:last-child { border-bottom: none; }

kbd {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: monospace;
  font-size: 11px;
  color: var(--text-0);
  min-width: 50px;
  text-align: center;
  flex-shrink: 0;
}

/* ── Toast notification ───────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 7px 18px;
  font-size: 13px;
  color: var(--text-0);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}
.toast-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Guide pill handles ───────────────────────────────────────────────── */
#guide-pills {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  overflow: visible;
}

.guide-pill {
  position: absolute;
  pointer-events: auto;
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  padding: 3px 7px;
  border-radius: 20px;
  white-space: nowrap;
  cursor: ns-resize;
  user-select: none;
  color: var(--pill-color, #fff);
  background: color-mix(in srgb, var(--pill-color, #888) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--pill-color, #888) 55%, transparent);
  transition: background 0.1s, color 0.1s;
}
.guide-pill:hover,
.guide-pill.dragging {
  background: var(--pill-color, #888);
  color: #fff;
}

/* ── Lucide icons ─────────────────────────────────────────────────────── */
.icon-btn svg, .tool-btn svg { width: 14px; height: 14px; stroke-width: 1.75; }
.btn-primary svg, .btn-secondary svg { width: 12px; height: 12px; stroke-width: 1.75; vertical-align: -2px; margin-right: 2px; }

/* ── Scrollbar (Firefox) ──────────────────────────────────────────────── */
* { scrollbar-width: thin; scrollbar-color: var(--border) var(--bg-1); }

/* ── Library page ─────────────────────────────────────────────────────── */
#library-page {
  display: none;
  flex-direction: column;
  height: 100vh;
  background: var(--bg-0);
}

#lib-topbar {
  display: flex;
  align-items: center;
  height: var(--topbar-h);
  padding: 0 10px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 8px;
}

.lib-title {
  flex: 1;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-0);
}

#lib-body {
  flex: 1;
  overflow-y: auto;
  padding: 28px 32px 48px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.lib-section-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.lib-section-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-0);
}

.lib-section-sub {
  font-size: 11px;
  color: var(--text-1);
}

.lib-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.lib-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s;
}

.lib-card:hover { border-color: var(--accent); }

.lib-thumb {
  display: block;
  width: 100%;
  height: 72px;
  background: var(--bg-1);
  image-rendering: pixelated;
}

.lib-card-info {
  padding: 10px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.lib-card-name-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.lib-card-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-0);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lib-card-sub {
  font-size: 11px;
  color: var(--text-1);
  margin-bottom: 8px;
}

.lib-card-actions {
  display: flex;
  gap: 6px;
  margin-top: auto;
}

.lib-badge {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--green);
  background: rgba(68, 204, 136, 0.1);
  border: 1px solid rgba(68, 204, 136, 0.25);
  border-radius: 3px;
  padding: 1px 5px;
  flex-shrink: 0;
}

.lib-empty {
  color: var(--text-1);
  font-size: 13px;
  padding: 20px 0;
  grid-column: 1 / -1;
}