/* ═══════════════════════════════════════════════════════
   Smart Sign Generator v1.5 – Style
   ═══════════════════════════════════════════════════════ */

/* ── CSS Variables ───────────────────────────────────── */
:root {
  --bg:        #0d1117;
  --surface:   #161b22;
  --card:      #21262d;
  --border:    #30363d;
  --text:      #e6edf3;
  --text-dim:  #8b949e;
  --accent:    #58a6ff;
  --accent2:   #3fb950;
  --warn:      #d29922;
  --danger:    #f85149;
  --sidebar-w: 310px;
  --header-h:  48px;
  --export-h:  56px;
  --radius:    8px;
  --glass-bg:  rgba(22,27,34,0.82);
  --glass-bdr: rgba(48,54,61,0.6);
}

/* ── Reset ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--header-h) 1fr var(--export-h);
  grid-template-areas:
    "header  header"
    "sidebar viewport"
    "export  export";
}

/* ── Header ──────────────────────────────────────────── */
#appHeader {
  grid-area: header;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
#appHeader h1 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.3px;
}
.badge {
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

/* ── Sidebar ─────────────────────────────────────────── */
#sidebar {
  grid-area: sidebar;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 8px 0;
}
#sidebar::-webkit-scrollbar { width: 6px; }
#sidebar::-webkit-scrollbar-track { background: transparent; }
#sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── Control Sections ────────────────────────────────── */
.ctrl-section { border-bottom: 1px solid var(--border); }
.section-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
  transition: color 0.15s;
}
.section-label:hover { color: var(--text); }
.section-label::after {
  content: '';
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--text-dim);
  transition: transform 0.2s;
}
.section-label.collapsed::after { transform: rotate(-90deg); }
.section-body {
  padding: 0 14px 12px;
  transition: max-height 0.25s ease, opacity 0.2s;
  max-height: 600px;
  opacity: 1;
  overflow: hidden;
}
.section-body.hidden {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
}

/* ── Control Row ─────────────────────────────────────── */
.ctrl-row {
  display: grid;
  grid-template-columns: 80px 1fr 36px 24px;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}
.ctrl-row label {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
}
.ctrl-row .val {
  text-align: right;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.ctrl-row .unit {
  font-size: 10px;
  color: var(--text-dim);
}

/* ── Range Sliders ───────────────────────────────────── */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--surface);
  cursor: pointer;
  transition: transform 0.1s;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--surface);
  cursor: pointer;
}

/* ── Text Inputs ─────────────────────────────────────── */
input[type="text"] {
  width: 100%;
  padding: 7px 10px;
  margin-bottom: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}
input[type="text"]:focus { border-color: var(--accent); }

/* ── Select ──────────────────────────────────────────── */
select {
  width: 100%;
  padding: 7px 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 13px;
  outline: none;
  cursor: pointer;
}
select:focus { border-color: var(--accent); }

/* ── Checkbox Toggle ─────────────────────────────────── */
.toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
  margin-bottom: 8px;
}
.toggle-label input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 34px; height: 18px;
  background: var(--border);
  border-radius: 9px;
  position: relative;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}
.toggle-label input[type="checkbox"]::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: transform 0.2s, background 0.2s;
}
.toggle-label input[type="checkbox"]:checked { background: var(--accent); }
.toggle-label input[type="checkbox"]:checked::after {
  transform: translateX(16px);
  background: #fff;
}

/* ── Color Inputs ────────────────────────────────────── */
.color-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.color-row label {
  font-size: 12px;
  color: var(--text-dim);
  min-width: 60px;
}
input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 36px; height: 28px;
  border: 2px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  background: transparent;
  padding: 0;
}
input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
input[type="color"]::-webkit-color-swatch { border-radius: 3px; border: none; }

/* ── Shape Selector ──────────────────────────────────── */
.shape-selector {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(54px, 1fr));
  gap: 6px;
}
.symbol-selector {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
  gap: 4px;
  max-height: 200px;
  overflow-y: auto;
}
.shape-btn, .symbol-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 3px;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  color: var(--text-dim);
  font-size: 9px;
}
.shape-btn:hover, .symbol-btn:hover { border-color: var(--text-dim); }
.shape-btn.active, .symbol-btn.active {
  border-color: var(--accent);
  background: rgba(88,166,255,0.1);
  color: var(--accent);
}
.shape-btn .icon, .symbol-btn .icon {
  font-size: 18px;
  line-height: 1;
}

/* ── Preset Grid ─────────────────────────────────────── */
.preset-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.preset-btn {
  padding: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 11px;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.15s, background 0.15s;
}
.preset-btn:hover {
  border-color: var(--accent);
  background: rgba(88,166,255,0.08);
}

/* ── Viewport ────────────────────────────────────────── */
#viewport {
  grid-area: viewport;
  position: relative;
  overflow: hidden;
  background: var(--bg);
}
#viewport canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

/* ── View Toolbar ────────────────────────────────────── */
#viewToolbar {
  position: absolute;
  top: 10px; right: 10px;
  display: flex;
  gap: 4px;
  z-index: 5;
}
#viewToolbar button {
  width: 32px; height: 32px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-bdr);
  border-radius: 6px;
  color: var(--text-dim);
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
}
#viewToolbar button:hover {
  background: var(--card);
  color: var(--text);
}

/* ── Info Bar ────────────────────────────────────────── */
#infoBar {
  position: absolute;
  bottom: 8px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 16px;
  padding: 6px 16px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-bdr);
  border-radius: 20px;
  font-size: 11px;
  color: var(--text-dim);
  z-index: 5;
  white-space: nowrap;
}
#infoBar span { display: flex; align-items: center; gap: 4px; }
.info-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  display: inline-block;
}
.info-dot.blue { background: var(--accent); }
.info-dot.green { background: var(--accent2); }
.info-dot.yellow { background: var(--warn); }

/* ── Export Bar ──────────────────────────────────────── */
#exportBar {
  grid-area: export;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.btn-primary, .btn-secondary {
  padding: 8px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
}
.btn-primary {
  background: var(--accent2);
  color: #fff;
}
.btn-secondary {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-primary:hover, .btn-secondary:hover { filter: brightness(1.15); }
.btn-primary:active, .btn-secondary:active { transform: scale(0.97); }
#colorChangeInfo {
  margin-left: auto;
  font-size: 12px;
  color: var(--warn);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── Loading Overlay ─────────────────────────────────── */
#loadingOverlay {
  position: fixed;
  inset: 0;
  background: rgba(13,17,23,0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  font-size: 16px;
  color: var(--text-dim);
  gap: 12px;
  transition: opacity 0.3s;
}
#loadingOverlay.hidden { opacity: 0; pointer-events: none; }
.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Toast ───────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 80px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  z-index: 200;
  opacity: 1;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}
#toast.success { background: var(--accent2); color: #fff; }
#toast.error { background: var(--danger); color: #fff; }
#toast.hidden { opacity: 0; transform: translateX(-50%) translateY(40px); }

/* ── Mount Options (dynamic) ─────────────────────────── */
#mountOpts { margin-top: 8px; }
#mountOpts .ctrl-row { margin-top: 4px; }

/* ── Symbol Position ─────────────────────────────────── */
.pos-row {
  display: flex;
  gap: 4px;
  margin-top: 6px;
}
.pos-btn {
  flex: 1;
  padding: 6px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
  font-size: 11px;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s;
}
.pos-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(88,166,255,0.1);
}

/* ── Rotation Buttons ────────────────────────────────── */
.rot-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.rot-btn {
  padding: 4px 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-dim);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  font-family: monospace;
}
.rot-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(88,166,255,0.08);
}
.rot-btn:active { transform: scale(0.93); }
.rot-reset {
  background: rgba(248,81,73,0.1);
  border-color: rgba(248,81,73,0.3);
  color: var(--danger);
}
.rot-reset:hover {
  background: rgba(248,81,73,0.2);
  border-color: var(--danger);
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {
  body {
    grid-template-columns: 1fr;
    grid-template-rows: var(--header-h) 45vh 1fr var(--export-h);
    grid-template-areas:
      "header"
      "viewport"
      "sidebar"
      "export";
  }
  #sidebar { border-right: none; border-top: 1px solid var(--border); }
  :root { --sidebar-w: 100%; }
}