/* ============================================
   3D SUPER GENERATOR - Base Styles
   Variables, Reset, Layout, Topbar, Forms, Buttons
   ============================================ */

/* Skip to content link */
.skip-link {
  position: absolute; top: -100px; left: 16px; z-index: 10000;
  padding: 8px 16px; background: var(--accent); color: #000; font-weight: 700;
  border-radius: 0 0 8px 8px; text-decoration: none; font-size: 14px;
}
.skip-link:focus { top: 0; }

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--accent, #4cc9f0);
  outline-offset: 2px;
}

:root {
  --bg: #080b10;
  --bg2: #0d1117;
  --panel: #111820;
  --card: #161d27;
  --card-hover: #1c2636;
  --border: #1e2a3a;
  --border-light: #2a3a4e;
  --text: #eef2f6;
  --text-dim: #b8c4d0;
  --text-muted: #8d9baa;
  --accent: #4cc9f0;
  --accent2: #7b61ff;
  --accent3: #f72585;
  --accent-glow: rgba(76,201,240,.15);
  --ok: #3fb950;
  --warn: #d29922;
  --err: #f85149;
  --danger: #da3633;
  --radius: 10px;
  --radius-sm: 6px;
  --sidebar-w: 370px;
  --topbar-h: 48px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  --glass: rgba(22,29,39,.65);
  --glass-border: rgba(76,201,240,.12);
  --glow-sm: 0 0 12px rgba(76,201,240,.2);
  --glow-md: 0 0 24px rgba(76,201,240,.25);
  --glow-lg: 0 4px 40px rgba(76,201,240,.3);
}

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

html, body {
  height: 100%; overflow: hidden;
  font-family: var(--font); font-size: 13px;
  color: var(--text); background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  display: flex;
  flex-direction: column;
}

/* ===== KEYFRAME ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInScale {
  from { opacity: 0; transform: scale(.92); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes pulseGlow {
  0%, 100% { text-shadow: 0 0 8px rgba(76,201,240,.3); }
  50% { text-shadow: 0 0 20px rgba(76,201,240,.6), 0 0 40px rgba(76,201,240,.2); }
}
@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes borderGlow {
  0%, 100% { border-color: var(--glass-border); }
  50% { border-color: rgba(76,201,240,.3); }
}
@keyframes spinDual {
  to { transform: rotate(360deg); }
}
@keyframes spinReverse {
  to { transform: rotate(-360deg); }
}
@keyframes iconBounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}
@keyframes badgePulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.08); opacity: .85; }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; transition: background .2s; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); box-shadow: var(--glow-sm); }

/* ===== TOPBAR ===== */
#topbar {
  min-height: var(--topbar-h);
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--panel) 0%, rgba(17,24,32,.95) 100%);
  border-bottom: 1px solid var(--glass-border);
  display: flex; align-items: center; padding: 0 16px; gap: 12px;
  position: relative; z-index: 100;
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  transition: box-shadow .3s;
}
#topbar::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: .3;
}
#topbar .logo {
  font-size: 16px; font-weight: 700; white-space: nowrap;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
#topbar .logo span { -webkit-text-fill-color: var(--text-dim); font-weight: 400; font-size: 12px; margin-left: 6px; }
#topbar .spacer { flex: 1; }
#topbar.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,.3); }

.btn-back {
  display: none; align-items: center; gap: 6px; padding: 6px 12px;
  background: var(--glass); border: 1px solid var(--glass-border); border-radius: var(--radius-sm);
  color: var(--text); cursor: pointer; font-size: 12px; transition: all .25s;
  backdrop-filter: blur(8px);
}
.btn-back:hover { border-color: var(--accent); color: var(--accent); box-shadow: var(--glow-sm); }
.btn-back svg { width: 14px; height: 14px; }
body.in-generator .btn-back { display: flex; }
body.in-generator .hub-nav { display: none; }
body.in-generator .hamburger-btn { display: none !important; }
body.in-generator .mobile-menu { display: none !important; }

.hub-nav { display: flex; gap: 6px; flex-wrap: wrap; }
.hub-nav button {
  padding: 5px 10px; background: none; border: 1px solid transparent;
  color: var(--text-dim); border-radius: var(--radius-sm); cursor: pointer;
  font-size: 12px; transition: all .25s; position: relative;
}
.hub-nav button:hover, .hub-nav button.active {
  color: var(--accent); border-color: var(--accent); background: var(--accent-glow);
  box-shadow: var(--glow-sm);
}

/* ===== GENERATOR VIEW LAYOUT ===== */
#generator { display: none; flex: 1; min-height: 0; }
body.in-generator #generator { display: grid; grid-template-columns: var(--sidebar-w) 1fr; }

/* ===== SIDEBAR ===== */
#sidebar {
  background: linear-gradient(180deg, var(--panel) 0%, rgba(13,17,23,.98) 100%);
  border-right: 1px solid var(--glass-border);
  overflow-y: auto; padding: 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-light) transparent;
}
#sidebar::after {
  content: ''; position: sticky; bottom: 0; left: 0; right: 0; height: 24px; display: block;
  background: linear-gradient(transparent, var(--panel));
  pointer-events: none; z-index: 5;
}
body.in-generator #sidebar { animation: slideInLeft .3s ease; will-change: transform, opacity; }

.gen-title {
  font-size: 15px; font-weight: 700; padding: 10px 12px;
  display: flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, rgba(76,201,240,.05), transparent);
  border-radius: var(--radius); margin-bottom: 8px;
}
.gen-title .ico { font-size: 26px; filter: drop-shadow(0 2px 6px rgba(0,0,0,.3)); }

/* ===== CARDS ===== */
.card {
  background: rgba(22,29,39,.55);
  border: 1px solid var(--glass-border); border-radius: var(--radius);
  margin-bottom: 8px; overflow: hidden;
  transition: border-color .2s, box-shadow .25s;
  backdrop-filter: blur(8px);
}
.card:hover { border-color: rgba(76,201,240,.2); }
.card:focus-within { border-color: rgba(76,201,240,.25); box-shadow: 0 0 0 1px rgba(76,201,240,.1); }
.card-head {
  padding: 10px 12px; font-size: 12px; font-weight: 600; cursor: pointer;
  display: flex; align-items: center; gap: 0;
  -webkit-user-select: none; user-select: none; transition: all .2s;
}
.card-head::before {
  content: ''; display: inline-block; width: 3px; height: 12px;
  background: linear-gradient(180deg, var(--accent), var(--accent2));
  border-radius: 2px; margin-right: 8px; flex-shrink: 0;
}
.card-head .arrow { margin-left: auto; transition: transform .2s; font-size: 10px; color: var(--text-dim); }
.card-head:hover { background: var(--card-hover); }
.card.collapsed .card-body { max-height: 0 !important; opacity: 0; padding-top: 0; padding-bottom: 0; border-top: none; display: none; }
.card.collapsed .card-head .arrow { transform: rotate(-90deg); }
.card-body {
  padding: 10px 12px; border-top: 1px solid var(--glass-border);
  transition: max-height .3s ease, opacity .25s ease, padding .25s ease;
  overflow: hidden;
}
.card:not(.collapsed) .card-body { overflow: visible; }

/* Export Card Highlight */
.card:has(#sp-exportSTL) .card-head::before,
.card:has([id$="-eSTL"]) .card-head::before,
.card:has([id$="-export-stl"]) .card-head::before,
.card:has([id$="-exportSTL"]) .card-head::before {
  background: linear-gradient(180deg, var(--ok), #2da44e);
}

/* ===== FORM ELEMENTS ===== */
.row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.row label { flex: 0 0 90px; font-size: 11px; color: var(--text); font-weight: 500; }
.row input[type="range"] { flex: 1; min-width: 0; }
.row input[type="number"], .row input[type="text"], .row select {
  width: 70px; padding: 4px 6px; background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 12px; outline: none;
  transition: all .2s;
}
.row input:focus, .row select:focus { border-color: var(--accent); box-shadow: 0 0 8px rgba(76,201,240,.15); }
.row input[type="text"] { width: 100%; flex: 1; }
.row input[type="color"] { width: 36px; height: 26px; border: 1px solid var(--border); border-radius: var(--radius-sm); cursor: pointer; background: none; padding: 1px; }

input[type="range"] {
  -webkit-appearance: none; height: 4px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent) var(--fill, 50%), var(--border) var(--fill, 50%), var(--border) 100%);
  border-radius: 2px; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); cursor: pointer; border: 2px solid var(--bg);
  box-shadow: 0 0 6px rgba(76,201,240,.4); transition: box-shadow .2s;
}
input[type="range"]::-webkit-slider-thumb:hover { box-shadow: 0 0 12px rgba(76,201,240,.6); }
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  border: 2px solid var(--bg);
  box-shadow: 0 0 6px rgba(76,201,240,.4);
}
input[type="range"]::-moz-range-track {
  height: 4px; border-radius: 2px;
  background: var(--border-light);
}

select { cursor: pointer; }
select option { background: var(--bg2); color: var(--text); }
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%234cc9f0'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 22px !important;
  -webkit-appearance: none; -moz-appearance: none; appearance: none;
}
.card-body label, .card-body .lbl { color: var(--text); }
.check-row label { color: var(--text); }
.check-row { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; font-size: 12px; }
.check-row input[type="checkbox"] { accent-color: var(--accent); }
input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }

.grid2 input[type="number"],
.row input[type="number"] { transition: all .2s; text-align: center; }
.grid2 input[type="number"]:focus,
.row input[type="number"]:focus { border-color: var(--accent); box-shadow: 0 0 8px rgba(76,201,240,.15); outline: none; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 7px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--glass); color: var(--text); font-size: 12px; cursor: pointer;
  transition: all .25s; white-space: nowrap; position: relative; overflow: hidden;
}
.btn:hover { border-color: var(--accent); color: var(--accent); box-shadow: var(--glow-sm); }
.btn.primary {
  background: linear-gradient(135deg, var(--accent), #3ab8df);
  color: var(--bg); border-color: transparent; font-weight: 600;
  box-shadow: 0 2px 12px rgba(76,201,240,.3);
}
.btn.primary:hover { box-shadow: 0 4px 20px rgba(76,201,240,.4); transform: translateY(-1px); }
.btn.sm { padding: 4px 10px; font-size: 11px; }
.btn.sm.active, .btn.sm[aria-pressed="true"] {
  background: linear-gradient(135deg, var(--accent), #3ab8df) !important;
  color: var(--bg) !important; border-color: transparent !important;
  font-weight: 600; box-shadow: 0 2px 8px rgba(76,201,240,.3);
}
.btn.sm:active { transform: scale(.95); }
.btn.danger { border-color: var(--danger); color: var(--danger); }
.btn.danger:hover { background: var(--danger); color: #fff; box-shadow: 0 0 16px rgba(218,54,51,.3); }
.btn-row { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.btn-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 6px; }

.chip {
  display: inline-flex; align-items: center; gap: 4px; padding: 5px 10px;
  background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); cursor: pointer; font-size: 11px; transition: all .25s;
}
.chip:hover, .chip.active {
  border-color: var(--accent); color: var(--accent); background: var(--accent-glow);
  box-shadow: var(--glow-sm);
}

/* ===== GRID2 ===== */
.grid2 {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px 10px; margin-bottom: 6px;
}
.grid2 label {
  display: flex; flex-direction: column; gap: 3px;
  font-size: 11px; color: var(--text); font-weight: 500;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.grid2 label span { color: var(--text-muted); font-size: 10px; font-weight: 400; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.grid2 label input[type="number"],
.grid2 label input[type="text"],
.grid2 label select {
  width: 100%; padding: 5px 8px; background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 12px; outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.grid2 label input[type="number"]:focus,
.grid2 label input[type="text"]:focus,
.grid2 label select:focus { border-color: var(--accent); box-shadow: 0 0 8px rgba(76,201,240,.15); }
.grid2 input[type="range"] { min-width: 0; grid-column: span 1; }

.sep { height: 1px; background: linear-gradient(90deg, transparent, var(--border-light), transparent); margin: 10px 0; }

/* ===== GENERATOR PANEL COMPONENTS ===== */
.type-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(72px, 1fr)); gap: 6px; }
.type-btn {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 8px 4px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm); cursor: pointer; font-size: 10px; color: var(--text-dim);
  text-align: center; line-height: 1.3; transition: all .2s; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.type-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }
.type-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); box-shadow: var(--glow-sm); }
.type-btn svg { width: 22px; height: 22px; flex-shrink: 0; }
.hk-type-section, [class$="-type-section"] { display: none; }
.hk-type-section.active, [class$="-type-section"].active { display: block; }

.toggle-row {
  display: flex; align-items: center; gap: 8px; padding: 6px 0;
  font-size: 12px; color: var(--text);
}
.toggle-row input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; }
.toggle-row label { cursor: pointer; color: var(--text); }

.btnrow { display: flex; gap: 6px; flex-wrap: wrap; margin: 4px 0; }
.btnrow button {
  flex: 1; min-width: 56px; padding: 7px 10px;
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 12px;
  cursor: pointer; transition: all .2s; white-space: nowrap;
}
.btnrow button:hover { border-color: var(--accent); color: var(--accent); box-shadow: var(--glow-sm); }
.btnrow button.btn-accent {
  background: linear-gradient(135deg, var(--accent), #3ab8df);
  color: var(--bg); border-color: transparent; font-weight: 600;
  box-shadow: 0 2px 10px rgba(76,201,240,.25);
}
.btnrow button.btn-accent:hover { box-shadow: 0 4px 18px rgba(76,201,240,.4); transform: translateY(-1px); }

.filebtn {
  flex: 1; min-width: 56px; padding: 7px 10px; display: flex;
  align-items: center; justify-content: center;
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 12px;
  cursor: pointer; transition: all .2s; white-space: nowrap;
}
.filebtn:hover { border-color: var(--accent); color: var(--accent); }
.filebtn input[type="file"] { display: none; }

.dim-box {
  font-size: 12px; line-height: 2; padding: 8px 10px;
  background: rgba(13,17,23,.5); border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
}
.dim-box .label { color: var(--text-muted); font-size: 11px; }
.dim-box .val { color: var(--accent); font-weight: 600; font-family: var(--mono); font-size: 12px; }

.warnings { font-size: 12px; line-height: 1.8; }
.warnings .warn { color: var(--warn); }
.warnings .hint { color: var(--text-dim); }

.foot { padding: 6px 4px 2px; margin-top: 4px; border-top: 1px solid var(--glass-border); }
.mini { font-size: 10px; color: var(--text-muted); line-height: 1.6; }

.preset-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 5px 0; border-bottom: 1px solid var(--glass-border); gap: 6px;
}
.preset-item:last-child { border-bottom: none; }
.preset-name {
  cursor: pointer; font-size: 12px; color: #c0ccd8;
  transition: color .2s; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.preset-name:hover { color: var(--accent); }
.preset-item button {
  padding: 2px 7px; font-size: 10px; background: none;
  border: 1px solid var(--border); border-radius: 4px; color: var(--err);
  cursor: pointer; transition: all .15s; flex-shrink: 0;
}
.preset-item button:hover { background: var(--err); color: #fff; }

/* ===== PRINT HINTS ===== */
.print-hint {
  margin: 8px 0; padding: 10px 12px; border-radius: 8px;
  font-size: 12px; line-height: 1.6;
  background: rgba(30,58,30,.5); color: #80ff80;
  border-left: 3px solid var(--ok);
}
.print-hint.warn {
  background: rgba(92,58,30,.5); color: #ffcc80;
  border-left-color: var(--warn);
}
.print-hint b { color: inherit; }

/* Print Quality Badge */
.print-quality {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 8px; border-radius: 6px; font-size: 10px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .3px;
}
.print-quality.good { background: rgba(63,185,80,.15); color: var(--ok); border: 1px solid rgba(63,185,80,.3); }
.print-quality.medium { background: rgba(210,153,34,.15); color: var(--warn); border: 1px solid rgba(210,153,34,.3); }
.print-quality.complex { background: rgba(123,97,255,.15); color: var(--accent2); border: 1px solid rgba(123,97,255,.3); }

/* ===== HAMBURGER MENU ===== */
.hamburger-btn {
  display: none;
  align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm); cursor: pointer;
  color: var(--text); font-size: 20px; line-height: 1;
  flex-shrink: 0; transition: all .2s; padding: 0;
}
.hamburger-btn:hover { border-color: var(--accent); color: var(--accent); }
.hamburger-btn.active { background: var(--accent); color: var(--bg); border-color: var(--accent); }

.mobile-menu {
  display: none; position: fixed;
  top: var(--topbar-h); left: 0; right: 0; bottom: 0; z-index: 99;
  background: rgba(8,11,16,.97);
  -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  overflow-y: auto; padding: 16px; animation: fadeInUp .2s ease;
}
.mobile-menu.open { display: block; }
.mobile-menu .mobile-nav-section { margin-bottom: 16px; }
.mobile-menu .mobile-nav-label {
  font-size: 10px; color: var(--text-muted); text-transform: uppercase;
  letter-spacing: 1px; margin-bottom: 8px; font-weight: 600;
}
.mobile-menu .mobile-nav-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.mobile-menu .mobile-nav-grid button,
.mobile-menu .mobile-nav-grid a {
  padding: 10px 8px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm); color: var(--text-dim); cursor: pointer;
  font-size: 12px; font-weight: 500; transition: all .2s;
  text-decoration: none; text-align: center; display: block;
}
.mobile-menu .mobile-nav-grid button:hover,
.mobile-menu .mobile-nav-grid a:hover,
.mobile-menu .mobile-nav-grid button.active {
  border-color: var(--accent); color: var(--accent); background: var(--accent-glow);
}
.mobile-menu .mobile-links { display: flex; flex-direction: column; gap: 6px; }
.mobile-menu .mobile-links a {
  padding: 12px 14px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm); color: var(--text); cursor: pointer;
  font-size: 13px; font-weight: 600; transition: all .2s;
  text-decoration: none; display: flex; align-items: center; gap: 8px;
}
.mobile-menu .mobile-links a:hover { border-color: var(--accent); color: var(--accent); }

/* ===== DISABLED STATES ===== */
input:disabled, select:disabled, button:disabled, .btn:disabled {
  opacity: 0.38; cursor: not-allowed; filter: grayscale(0.5); pointer-events: none;
}
label:has(input:disabled),
.row:has(input:disabled) label,
.row:has(select:disabled) label { opacity: 0.5; cursor: not-allowed; }

/* ===== GPU ACCELERATION ===== */
body.in-generator #viewport { will-change: transform, opacity; }
.spinner::before, .spinner::after { will-change: transform; }
.scroll-top-btn { will-change: transform, opacity; }
.toast { will-change: transform, opacity; }

/* ===== LANGUAGE DROPDOWN ===== */
#lang-toggle {
  background: var(--glass) !important;
  border: 1px solid var(--glass-border) !important;
  color: var(--accent) !important;
  font-size: 11px !important; font-weight: 700 !important;
  min-width: 44px !important; height: 28px;
  padding: 2px 6px !important; border-radius: var(--radius-sm);
  cursor: pointer; transition: all .2s;
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
#lang-toggle:hover { border-color: var(--accent) !important; box-shadow: var(--glow-sm); }
#lang-toggle option { background: var(--bg2); color: var(--text); font-size: 12px; padding: 4px 8px; }

/* ===== Z-INDEX LAYERS =====
   10   - viewport toolbar / info overlay
   20   - sidebar sticky elements
   100  - topbar
   999  - scroll-to-top button
   1000 - tooltips
   9999 - toast container
   10000 - loading overlay
   10001 - shortcuts overlay
*/

/* ===== SIDEBAR TOGGLE BUTTON ===== */
.sidebar-toggle-btn {
  display: none;
  align-items: center; justify-content: center; gap: 6px;
  width: 100%; padding: 8px 12px;
  background: var(--panel); border: none;
  border-bottom: 1px solid var(--glass-border);
  color: var(--text-dim); font-size: 12px; font-weight: 600;
  cursor: pointer; z-index: 20;
  position: sticky; top: 0;
  transition: background .2s, color .2s;
}
.sidebar-toggle-btn:hover { background: var(--card-hover); color: var(--accent); }
.sidebar-toggle-btn svg { width: 14px; height: 14px; transition: transform .25s ease; }
.sidebar-toggle-btn.open svg { transform: rotate(180deg); }

/* ===== SCROLLBAR (Firefox) ===== */
#sidebar, #hub { scrollbar-width: thin; scrollbar-color: var(--border-light) transparent; }

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== iOS Safari 100vh fix ===== */
@supports (height: 100dvh) {
  html, body { height: 100dvh; }
}