:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --field: #ffffff;
  --card: #ffffff;
  --surface-soft: #f2f4f6;
  --border: #e5e8eb;
  --text: #191f28;
  --muted: #6b7684;
  --accent: #3182f6;
  --accent-2: #2272e6;
  --ok: #12b886;
  --danger: #f04452;
  --warn: #d99800;
  --r: 12px;
  font-family: Pretendard, Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { min-height: 100vh; margin: 0; color: var(--text); background: var(--bg); }
button, input, select { font: inherit; }

.panel {
  width: 400px !important;
  min-width: 400px !important;
  height: 100vh;
  padding: 24px 20px 42px !important;
  overflow-y: auto;
  border-right: 1px solid var(--border) !important;
  background: var(--panel) !important;
  scrollbar-color: #c4cbd3 transparent;
  scrollbar-width: thin;
}
.panel-inner { padding: 0 !important; }
.brand, .logo { display: flex; align-items: center; gap: 10px; margin: 0 0 17px !important; }
.brand-icon, .logo-icon {
  display: grid !important;
  place-items: center;
  width: 36px !important;
  height: 36px !important;
  flex: 0 0 36px;
  border-radius: 11px !important;
  color: #fff !important;
  background: var(--accent) !important;
  font-size: 15px !important;
  font-weight: 800;
}
.brand h1, .logo-text { margin: 0; color: var(--text); font-size: 15px !important; font-weight: 780 !important; letter-spacing: -.03em; }
.brand p, .logo-sub { margin: 3px 0 0 !important; color: var(--muted) !important; font-size: 11px !important; }

.lang-row { display: grid !important; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px !important; margin: 0 0 18px !important; }
.lang-btn {
  min-height: 32px;
  padding: 0 6px !important;
  border: 1px solid var(--border) !important;
  border-radius: 8px !important;
  color: var(--muted) !important;
  background: var(--surface-soft) !important;
  font-size: 11px !important;
  font-weight: 700 !important;
  cursor: pointer;
}
.lang-btn:hover { border-color: #b9d7ff !important; color: var(--accent) !important; }
.lang-btn.active { border-color: var(--accent) !important; color: #fff !important; background: var(--accent) !important; }

.section { margin-top: 22px; }
.section-title { margin: 0 0 10px !important; color: var(--muted) !important; font-size: 11px !important; font-weight: 800 !important; letter-spacing: .06em !important; }
.divider, hr.divider { height: 1px !important; margin: 22px 0 !important; border: 0 !important; background: var(--border) !important; }
.field { margin-bottom: 12px !important; }
label, .field label { display: block; margin-bottom: 6px !important; color: var(--muted) !important; font-size: 12px !important; }
input[type="text"], input[type="url"], select, .field input, .field select {
  width: 100%;
  height: 40px !important;
  padding: 0 11px !important;
  border: 1px solid var(--border) !important;
  border-radius: 9px !important;
  color: var(--text) !important;
  background: #fff !important;
  outline: 0;
  font-size: 13px !important;
  box-shadow: none !important;
}
input[type="text"]:focus, input[type="url"]:focus, select:focus, .field input:focus, .field select:focus { border-color: var(--accent) !important; box-shadow: 0 0 0 3px rgba(49,130,246,.12) !important; }
input[type="range"] { accent-color: var(--accent) !important; }

.settings { gap: 10px !important; }
.color-field, .color-input {
  min-height: 40px !important;
  padding: 3px !important;
  border: 1px solid var(--border) !important;
  border-radius: 9px !important;
  background: #fff !important;
}
.color-field input[type="text"], .color-input input[type="text"] { height: 30px !important; border: 0 !important; box-shadow: none !important; }
.color-field input[type="color"], .color-input input[type="color"] { width: 32px !important; height: 30px !important; border: 0 !important; border-radius: 6px !important; }
.range-label output { color: var(--text) !important; font-weight: 700; }

.toggle-row { min-height: 42px !important; margin-top: 3px !important; color: var(--text) !important; font-size: 13px !important; }
.toggle-row span { color: var(--muted) !important; font-size: 11px !important; }
.switch { width: 40px !important; height: 22px !important; }
.knob { border: 1px solid #d8dde3 !important; background: #e9ecf0 !important; }
.knob::before { top: 3px !important; left: 3px !important; width: 14px !important; height: 14px !important; background: #fff !important; box-shadow: 0 1px 2px rgba(0,0,0,.14); }
.switch input:checked + .knob { border-color: var(--accent) !important; background: var(--accent) !important; }
.switch input:checked + .knob::before { transform: translateX(18px) !important; }

.chip { border-color: var(--border) !important; color: #4e5968 !important; background: #fff !important; }
.chip:hover { border-color: #a8cdfd !important; color: var(--accent) !important; }
.chip.selected { color: #1d6fdc !important; border-color: #93c5fd !important; background: var(--blue-soft, #e8f3ff) !important; }
.stack-note, .stack-group h3 { color: var(--muted) !important; }
.stack-note strong { color: var(--accent) !important; }

.url, .url-box { border-color: var(--border) !important; color: var(--muted) !important; background: var(--surface-soft) !important; }
.buttons, .btn-group { gap: 8px !important; }
.btn, .button-like {
  min-height: 40px;
  border: 1px solid var(--border) !important;
  border-radius: 9px !important;
  color: #4e5968 !important;
  background: #fff !important;
  font-weight: 750 !important;
}
.btn.primary, .btn-primary { border-color: var(--accent) !important; color: #fff !important; background: var(--accent) !important; }
.btn:hover { opacity: 1 !important; background: var(--surface-soft) !important; }
.btn.primary:hover, .btn-primary:hover { background: var(--accent-2) !important; }
.refresh-btn { border-color: var(--border) !important; color: var(--muted) !important; background: #fff !important; }
.refresh-btn:hover { border-color: #a8cdfd !important; color: var(--accent) !important; }
.file-drop { border-color: #cdd5df !important; color: var(--muted) !important; background: var(--surface-soft) !important; }
.file-drop:hover { border-color: var(--accent) !important; color: var(--accent) !important; }
.invite-warn { border-color: #f5d68a !important; color: #8b6200 !important; background: #fff8df !important; }
.invite-warn a { color: #8b6200 !important; }

.preview, .preview-area {
  flex: 1;
  min-width: 0;
  min-height: 100vh;
  padding: 56px 32px !important;
  color: var(--text) !important;
  background: #f5f6f8 !important;
}
.preview-label { color: var(--muted) !important; font-size: 11px !important; font-weight: 800 !important; letter-spacing: .08em !important; }
#svgWrap { width: min(760px, 100%) !important; }
#svgWrap svg { display: block; max-width: 100%; height: auto; }
.empty-preview { border-color: #cdd5df !important; color: var(--muted) !important; background: #fff !important; }
.spinner { border-color: #dfe5ec !important; border-top-color: var(--accent) !important; }
.toast { border-color: var(--border) !important; color: var(--text) !important; background: #fff !important; box-shadow: 0 8px 22px rgba(25,31,40,.12); }

@media (max-width: 880px) {
  body { display: block !important; }
  .panel { width: 100% !important; min-width: 0 !important; height: auto !important; border-right: 0 !important; border-bottom: 1px solid var(--border) !important; }
  .preview, .preview-area { min-height: auto; padding: 34px 16px 48px !important; }
}