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

:root {
  --bg:         #1a1a2e;
  --bg2:        #16213e;
  --bg3:        #0f3460;
  --surface:    #1e2a3a;
  --surface2:   #253447;
  --accent:     #e94560;
  --accent2:    #0f8eff;
  --text:       #e0e0e0;
  --text-muted: #8899aa;
  --border:     #2a3f5a;
  --radius:     6px;
  --shadow:     0 2px 12px rgba(0,0,0,0.5);
  --handle:     8px;
}

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

/* ===== LAYOUT ===== */
#app { display: grid; grid-template-rows: 44px 1fr; grid-template-columns: 1fr 280px; height: 100vh; }

#top-bar {
  grid-column: 1 / -1;
  display: flex; align-items: center; gap: 6px;
  padding: 0 12px;
  background: var(--bg2); border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

#canvas-area {
  grid-row: 2; grid-column: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: var(--bg); overflow: hidden; position: relative;
}

#right-panel {
  grid-row: 2; grid-column: 2;
  background: var(--bg2); border-left: 1px solid var(--border);
  display: flex; flex-direction: column;
  overflow-y: auto;
}

/* ===== BUTTONS (base) ===== */
button {
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
  padding: 5px 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); cursor: pointer;
  font-size: 12px; font-family: inherit;
  transition: background .12s, border-color .12s, color .12s;
  white-space: nowrap; user-select: none;
}
button:hover  { background: var(--surface2); border-color: var(--accent2); }
button.active { background: var(--accent2);  border-color: var(--accent2); color: #fff; }

.btn-accent       { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-accent:hover { filter: brightness(1.15); background: var(--accent); border-color: var(--accent); }

/* ===== TOP BAR ===== */
.app-title {
  font-weight: 700; font-size: 15px;
  color: var(--accent); letter-spacing: .05em; margin-right: 4px;
  white-space: nowrap;
}
.top-spacer { flex: 1; }

.export-btn {
  padding: 5px 12px; background: var(--accent); color: #fff;
  border: 1px solid var(--accent); border-radius: var(--radius);
  cursor: pointer; font-size: 12px; font-weight: 600;
  transition: filter .15s;
}
.export-btn:hover { filter: brightness(1.15); }

.about-btn {
  padding: 4px 10px; font-size: 11px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text-muted);
  cursor: pointer; letter-spacing: .04em;
  transition: color .12s, border-color .12s;
}
.about-btn:hover { color: var(--text); border-color: var(--accent2); background: var(--surface2); }

/* ===== TOOLBAR ===== */
#toolbar { display: contents; }
.tool-btn {
  width: 40px; height: 40px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); border-radius: var(--radius); cursor: pointer;
  font-size: 16px; display: flex; align-items: center; justify-content: center;
  transition: background .1s, border-color .1s;
}
.tool-btn:hover  { background: var(--surface2); border-color: #555; }
.tool-btn.active { background: var(--accent2);  border-color: var(--accent2); color: #fff; }

/* ===== CANVAS ===== */
#main-canvas {
  display: block;
  box-shadow: var(--shadow), 0 0 0 1px var(--border);
  image-rendering: pixelated;
  max-width: 100%; max-height: 100%;
  width: 600px; height: 600px;
  border-radius: var(--radius);
}

/* ===== RIGHT PANEL SECTIONS ===== */
.panel-section {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .05em; color: var(--text-muted); margin-bottom: 8px;
}

.prop-row {
  display: flex; align-items: center; gap: 6px; margin-bottom: 6px; flex-wrap: wrap;
}
.prop-row label { color: var(--text-muted); min-width: 52px; font-size: 12px; }

input[type="color"] {
  width: 32px; height: 24px; border: 1px solid var(--border);
  border-radius: var(--radius); cursor: pointer; background: none; padding: 1px;
}
input[type="number"], input[type="text"] {
  width: 60px; padding: 3px 6px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); border-radius: var(--radius); font-size: 12px;
}
input[type="range"]    { flex: 1; accent-color: var(--accent2); }
input[type="checkbox"] { accent-color: var(--accent2); cursor: pointer; }

/* Fill type buttons */
.fill-type-btn {
  flex: 1; padding: 4px 6px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); border-radius: var(--radius); cursor: pointer; font-size: 11px;
  transition: background .1s;
}
.fill-type-btn:hover  { background: var(--surface2); border-color: var(--accent2); }
.fill-type-btn.active { background: var(--accent2);  border-color: var(--accent2); color: #fff; }

/* ===== GRADIENT EDITOR ===== */
#gradient-editor-area { padding: 0 12px 8px; }

.grad-bar {
  position: relative; height: 28px; border-radius: var(--radius); cursor: crosshair;
  border: 1px solid var(--border); margin-bottom: 8px;
  background: linear-gradient(90deg, #fff 0%, #000 100%);
}
.grad-stop {
  position: absolute; top: -4px; width: 16px; height: 36px;
  transform: translateX(-50%);
  border: 2px solid #fff; border-radius: 3px; cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,0.5);
  transition: box-shadow .1s;
}
.grad-stop.selected { box-shadow: 0 0 0 2px var(--accent2), 0 1px 4px rgba(0,0,0,0.5); }

.stop-editor { padding: 4px 0; }
.del-stop-btn {
  margin-top: 4px; padding: 3px 8px;
  background: #b03030; border: none; color: #fff;
  border-radius: var(--radius); cursor: pointer; font-size: 11px;
}

/* ===== LAYER PANEL ===== */
#layer-panel { padding: 8px 0; }

.layer-row {
  border-bottom: 1px solid var(--border); padding: 6px 10px;
  cursor: pointer; transition: background .1s;
}
.layer-row:hover  { background: var(--surface); }
.layer-row.active { background: rgba(15,142,255,0.12); border-left: 3px solid var(--accent2); }

.layer-header  { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.layer-name    { font-size: 12px; font-weight: 600; }
.layer-vis-btn { background: none; border: none; cursor: pointer; font-size: 14px; padding: 0; line-height: 1; }
.layer-vis-btn:hover { background: none; border-color: transparent; }

.layer-options { padding-left: 4px; }
.sym-row  { display: flex; align-items: center; gap: 6px; margin-bottom: 4px; }
.sym-row label { color: var(--text-muted); font-size: 11px; min-width: 60px; }
.sym-btns { display: flex; gap: 3px; }
.sym-btn {
  width: 28px; height: 24px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); border-radius: var(--radius); cursor: pointer; font-size: 13px;
  transition: background .1s;
}
.sym-btn:hover  { background: var(--surface2); border-color: var(--accent2); }
.sym-btn.active { background: var(--accent2);  border-color: var(--accent2); color: #fff; }

.circ-row { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.circ-row label { color: var(--text-muted); font-size: 11px; }
.circ-count, .circ-offset { width: 48px; }

/* ===== ALIGN SECTION ===== */
.align-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}
.align-btn {
  padding: 5px 4px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); border-radius: var(--radius); cursor: pointer;
  font-size: 13px; text-align: center;
  transition: background .1s, border-color .1s;
}
.align-btn:hover { background: var(--surface2); border-color: var(--accent2); }
.align-btn-wide  { font-size: 12px; }

/* ===== OUTLINE SECTION ===== */
#outline-section .prop-row { align-items: center; }
#outline-section input[type="color"] { width: 32px; height: 24px; }

/* ===== SHAPE OPTIONS ===== */
#shape-options { }

/* ===== MODAL ===== */
.modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.65);
  z-index: 200;
  align-items: center; justify-content: center;
}

.modal-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  width: min(540px, 95vw);
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 14px;
}

.modal-box h2 {
  font-size: 16px;
  color: var(--accent2);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.modal-footer {
  display: flex; justify-content: flex-end; gap: 8px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
  margin-top: auto;
}

/* ===== ABOUT / WELCOME MODAL ===== */
.welcome-box { width: min(560px, 95vw); }

.welcome-header {
  text-align: center;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.welcome-title {
  font-size: 26px; font-weight: 800;
  color: var(--accent); letter-spacing: .05em;
  margin-bottom: 2px;
}

.welcome-version { font-size: 11px; color: var(--text-muted); }

.welcome-section {
  display: flex; flex-direction: column; gap: 10px;
}

.welcome-section h3 {
  font-size: 12px; font-weight: 700;
  color: var(--accent2);
  border-bottom: 1px solid var(--border);
  padding-bottom: 4px;
  text-transform: uppercase; letter-spacing: .04em;
}

.welcome-howto {
  list-style: none;
  display: flex; flex-direction: column; gap: 5px;
  font-size: 12px; color: var(--text);
  padding-left: 4px;
}
.welcome-howto li::before { content: '▸ '; color: var(--accent2); }

.welcome-shortcuts {
  border-collapse: collapse;
  font-size: 12px; width: 100%; margin-top: 4px;
}
.welcome-shortcuts td {
  padding: 3px 10px 3px 0;
  color: var(--text); vertical-align: middle;
}
.welcome-shortcuts td:first-child { white-space: nowrap; width: 160px; }

kbd {
  display: inline-block;
  padding: 1px 6px; font-size: 11px; font-family: inherit;
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: 3px; color: var(--text);
}

/* Author cards */
.author-cards { display: flex; gap: 12px; flex-wrap: wrap; }

.author-card {
  display: flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 10px 14px;
  flex: 1; min-width: 160px;
}

.author-icon {
  width: 48px; height: 48px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--surface2);
}

.author-info  { display: flex; flex-direction: column; gap: 4px; }
.author-name  { font-size: 13px; font-weight: 700; color: var(--text); }
.author-link  { font-size: 11px; color: var(--accent2); text-decoration: none; }
.author-link:hover { text-decoration: underline; }

/* ===== SCROLLBARS ===== */
* { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
*::-webkit-scrollbar       { width: 6px; height: 6px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
*::-webkit-scrollbar-thumb:hover { background: #445; }