/* ===================== */
/* GLOBAL RESET & BODY */
/* ===================== */
body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: transparent;
  transition: all 0.4s ease;
}

/* ===================== */
/* DARK MODE VARIABLES */
/* ===================== */
body.dark {
  --bg: #0f172a;
  --box: #020617;
  --text: #e5e7eb;
  --accent: #4da3ff;
  --muted: #94a3b8;
}

/* ===================== */
/* SIM CONTAINER */
/* ===================== */
.sim-container {
  width: 100%;
  max-width: 1000px;
  background: linear-gradient(145deg, #f0f8ff, #e0f0ff);
  border-radius: 20px;
  padding: 28px 28px 32px;
  margin: 0 auto 20px auto;
  box-shadow: 0 6px 18px rgba(0,122,204,0.12);
  position: relative;
  transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.45s ease;
}

.sim-container:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(2, 132, 199, 0.2);
}

.sim-layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 22px;
  align-items: start;
}

.sim-sidebar,
.sim-main {
  min-width: 0;
}

.sim-sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sim-main {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

body.dark .sim-container {
  background: linear-gradient(145deg, #0f1115, #161c26);
  box-shadow: 0 10px 30px rgba(0,0,0,0.6),
              inset 0 0 0 1px rgba(255,255,255,0.05);
}

/* ===================== */
/* CANVAS */
/* ===================== */
#simCanvas {
  width: 100%;
  max-width: 700px;
  border-radius: 20px;
  background: radial-gradient(circle at center, #f5f5f5 0%, #cce0ff 100%);
  display: block;
  margin: 0 auto 20px auto;
  box-shadow: 0 10px 24px rgba(0,122,204,0.17), 0 0 30px rgba(37,99,235,0.12);
  transition: transform 0.25s ease, background 0.45s ease, box-shadow 0.3s ease;
}

body.dark #simCanvas {
  background: radial-gradient(circle at center, #1b2230 0%, #0f141d 100%);
  box-shadow: 0 10px 28px rgba(0,0,0,0.55),
              0 0 30px rgba(77,163,255,0.12);
}

#simCanvas:hover {
  transform: scale(1.015);
  box-shadow: 0 14px 30px rgba(0,122,204,0.2), 0 0 34px rgba(37,99,235,0.16);
}

#bike {
  position: absolute;
  left: 50%;
  top: 0;
  width: 88px;
  height: 50px;
  transform: translate(-50%, 0);
  pointer-events: none;
  z-index: 3;
  filter: drop-shadow(0 4px 6px rgba(0,0,0,0.28));
  transition: filter 0.2s ease, transform 0.08s linear;
}

#bike svg {
  width: 100%;
  height: 100%;
  display: block;
}

#bike .wheel {
  fill: none;
  stroke: #ef4444;
  stroke-width: 2.6;
}

#bike .wheel-group {
  transform-box: fill-box;
  transform-origin: center;
  will-change: transform;
}

#bike .frame {
  fill: none;
  stroke: #ef4444;
  stroke-width: 2.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===================== */
/* CONTROLS */
/* ===================== */
.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: center;
  gap: 12px 16px;
  margin-bottom: 0;
}

.controls button, .param-btn, .reset-btn {
  padding: 10px 18px;
  min-height: 44px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, #0b79ff, #22c1ff);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(0,122,204,0.25);
  transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.25s ease, filter 0.2s ease;
}

.controls button:hover, .param-btn:hover, .reset-btn:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #0b60cc, #1fa1dd);
  box-shadow: 0 8px 20px rgba(0,122,204,0.35);
  filter: saturate(1.05);
}

.controls #speedDisplay {
  min-width: 5.5rem;
  text-align: center;
  font-weight: 700;
  font-size: 1.05rem;
  color: #0f172a;
  padding: 8px 12px;
}

body.dark .controls #speedDisplay {
  color: var(--text);
}

.reset-btn {
  background: linear-gradient(135deg, #64748b, #475569);
  box-shadow: 0 4px 12px rgba(71, 85, 105, 0.35);
}

.reset-btn:hover {
  background: linear-gradient(135deg, #475569, #334155);
  box-shadow: 0 6px 16px rgba(51, 65, 85, 0.4);
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: center;
  gap: 10px 12px;
  margin-bottom: 0;
}

.preset-btn {
  padding: 10px 18px;
  min-height: 44px;
  border-radius: 12px;
  border: 2px solid transparent;
  cursor: pointer;
  font-weight: 700;
  color: #0f172a;
  background: linear-gradient(145deg, #e8f4ff, #dbeafe);
  box-shadow: 0 2px 10px rgba(11,121,255,0.12);
  transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease, color 0.2s ease;
}

body.dark .preset-btn {
  color: var(--text);
  background: linear-gradient(145deg, #1e293b, #0f172a);
  box-shadow: 0 2px 10px rgba(0,0,0,0.35);
}

.preset-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(11,121,255,0.24);
}

.preset-btn.is-active {
  border-color: #0b79ff;
  background: linear-gradient(135deg, #0b79ff, #22c1ff);
  color: #fff;
  box-shadow: 0 8px 20px rgba(11,121,255,0.38), 0 0 14px rgba(34,193,255,0.26);
}

body.dark .preset-btn.is-active {
  border-color: var(--accent);
  color: #0f172a;
}

.preset-btn:focus-visible {
  outline: 2px solid #0b79ff;
  outline-offset: 3px;
}

/* ===================== */
/* PARAM GRID & SLIDERS */
/* ===================== */
.params {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 0;
}

.param-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.param-label {
  color: #0f172a;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.3;
  transition: color 0.3s ease;
}

body.dark .param-label { color: var(--text); }

.terrain-select {
  width: 100%;
  max-width: 280px;
  margin: 0 auto;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid rgba(0,122,204,0.25);
  background: #f5f5f5;
  color: #0f172a;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.terrain-select:focus {
  border-color: #0b79ff;
  box-shadow: 0 0 6px rgba(11,121,255,0.3);
  outline: none;
}

body.dark .terrain-select {
  background: #0f141d;
  color: var(--text);
  border: 1px solid #334155;
}

.param-slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.param-slider-row input[type="range"] {
  flex: 1;
  min-width: 0;
  height: 8px;
  border-radius: 999px;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(90deg, rgba(11,121,255,0.2), rgba(34,193,255,0.35));
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.08), 0 0 0 rgba(11,121,255,0);
  transition: box-shadow 0.2s ease, background 0.25s ease;
}

body.dark .param-slider-row input[type="range"] {
  background: linear-gradient(90deg, rgba(77,163,255,0.15), rgba(34,193,255,0.2));
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.35);
}

.param-slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(145deg, #0b79ff, #22c1ff);
  border: 2px solid #fff;
  box-shadow: 0 2px 8px rgba(11,121,255,0.45);
  cursor: pointer;
}

.param-slider-row input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(145deg, #0b79ff, #22c1ff);
  border: 2px solid #fff;
  box-shadow: 0 2px 8px rgba(11,121,255,0.45);
  cursor: pointer;
}

.param-slider-row input[type="range"]:focus {
  outline: none;
}

.param-slider-row input[type="range"]:focus-visible {
  outline: 2px solid #0b79ff;
  outline-offset: 4px;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.08), 0 0 10px rgba(11,121,255,0.22);
}

body.dark .param-slider-row input[type="range"]::-webkit-slider-thumb {
  border-color: #1e293b;
}

body.dark .param-slider-row input[type="range"]::-moz-range-thumb {
  border-color: #1e293b;
}

.param-value {
  flex-shrink: 0;
  min-width: 4.5rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 0.95rem;
  color: #0b79ff;
  padding: 6px 10px;
  border-radius: 10px;
  background: rgba(11,121,255,0.08);
}

body.dark .param-value {
  color: var(--accent);
  background: rgba(77,163,255,0.12);
}

/* ===================== */
/* STATS */
/* ===================== */
.stats {
  text-align: center;
  font-size: 1.1rem;
  line-height: 1.75;
  background: linear-gradient(145deg, #f0f8ff, #e0f0ff);
  padding: 18px 22px;
  border-radius: 16px;
  color: #0b79ff;
  box-shadow: inset 0 2px 6px rgba(0,122,204,0.1), 0 3px 12px rgba(2,132,199,0.08);
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.35s ease;
}

.stats:hover {
  transform: translateY(-1px);
  box-shadow: inset 0 2px 6px rgba(0,122,204,0.1), 0 8px 18px rgba(2,132,199,0.16);
}

body.dark .stats {
  background: linear-gradient(145deg, #0f141d, #151b26);
  color: var(--accent);
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.6),
              0 0 14px rgba(77,163,255,0.15);
}

/* Gradient text for stats numbers */
.stats span {
  background: linear-gradient(90deg,#4da3ff,#22c55e);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
}

/* ===================== */
/* COMPARE PANEL */
/* ===================== */
.compare-panel {
  max-width: 700px;
  margin: 0;
  padding: 16px 18px;
  border-radius: 16px;
  background: linear-gradient(145deg, #f8fafc, #eff6ff);
  border: 1px solid rgba(11,121,255,0.18);
  box-shadow: 0 2px 12px rgba(0,122,204,0.08);
  transition: transform 0.25s ease, box-shadow 0.3s ease;
}

.compare-panel:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(2,132,199,0.14);
}

body.dark .compare-panel {
  background: linear-gradient(145deg, #0f141d, #151b26);
  border-color: rgba(77,163,255,0.2);
  box-shadow: 0 2px 14px rgba(0,0,0,0.35);
}

.compare-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}

.compare-toolbar button {
  padding: 8px 14px;
  min-height: 40px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.85rem;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

#copyToSetupB {
  background: linear-gradient(135deg, #0b79ff, #22c1ff);
  color: #fff;
  box-shadow: 0 3px 10px rgba(11,121,255,0.3);
}

#copyToSetupB:hover { transform: translateY(-1px); }

#clearSetupB {
  background: transparent;
  color: #64748b;
  border: 1px solid rgba(100,116,139,0.45);
}

body.dark #clearSetupB { color: var(--muted); border-color: rgba(148,163,184,0.35); }

#clearSetupB:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.compare-hint {
  margin: 0;
  font-size: 0.9rem;
  color: #64748b;
  line-height: 1.4;
}

body.dark .compare-hint { color: var(--muted); }

.compare-grid[hidden] { display: none !important; }

.compare-grid {
  display: grid;
  grid-template-columns: minmax(5.5rem,auto) 1fr 1fr;
  gap: 8px 12px;
  align-items: center;
  font-size: 0.95rem;
}

.compare-head {
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #64748b;
}

body.dark .compare-head { color: var(--muted); }

.compare-label { color: #0f172a; font-weight: 600; }
body.dark .compare-label { color: var(--text); }

.compare-val {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  padding: 8px 10px;
  border-radius: 10px;
  text-align: center;
  background: rgba(11,121,255,0.06);
  border: 2px solid transparent;
  transition: border-color 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}

body.dark .compare-val {
  background: rgba(77,163,255,0.1);
}

.compare-val.compare-better {
  border-color: #22c55e;
  background: rgba(34,197,94,0.12);
}

.compare-val.compare-muted {
  opacity: 0.55;
}

/* ===================== */
/* CHALLENGE MODE */
/* ===================== */
.challenge-panel {
  max-width: none;
  margin: 0;
  padding: 14px 16px;
  border-radius: 14px;
  background: linear-gradient(145deg, #fefce8, #fef9c3);
  border: 1px solid rgba(234, 179, 8, 0.35);
  transition: transform 0.25s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.challenge-panel:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(234, 179, 8, 0.2);
}

body.dark .challenge-panel {
  background: linear-gradient(145deg, #1c1917, #292524);
  border-color: rgba(250, 204, 21, 0.25);
}

.challenge-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

#startChallengeBtn {
  padding: 10px 18px;
  min-height: 44px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
  color: #1f2937;
  background: linear-gradient(135deg, #facc15, #f59e0b);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
}

#startChallengeBtn:hover { transform: translateY(-1px); }

#startChallengeBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.challenge-live {
  font-size: 0.9rem;
  font-weight: 600;
  color: #854d0e;
}

body.dark .challenge-live { color: #fcd34d; }

.challenge-phase {
  margin: 10px 0 0;
  font-size: 0.85rem;
  color: #713f12;
  line-height: 1.4;
}

body.dark .challenge-phase { color: #fde68a; }

.challenge-results {
  margin-top: 12px;
  padding: 14px;
  border-radius: 12px;
  background: rgba(255,255,255,0.65);
  border: 1px solid rgba(234, 179, 8, 0.4);
}

body.dark .challenge-results {
  background: rgba(0,0,0,0.25);
  border-color: rgba(250, 204, 21, 0.2);
}

.challenge-results p { margin: 0.35em 0; }

.challenge-score-hint {
  font-size: 0.85em;
  font-weight: 500;
  color: #64748b;
}

body.dark .challenge-score-hint { color: var(--muted); }

#challengeDismissBtn {
  margin-top: 10px;
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid rgba(15,23,42,0.2);
  background: #fff;
  font-weight: 600;
  cursor: pointer;
}

body.dark #challengeDismissBtn {
  background: #334155;
  color: var(--text);
  border-color: #475569;
}

/* ===================== */
/* SHARE RESULT */
/* ===================== */
.share-row {
  max-width: 700px;
  margin: 0 auto 16px;
  display: flex;
  justify-content: flex-end;
}

#shareResultBtn {
  padding: 10px 16px;
  min-height: 42px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
  color: #1f2937;
  background: linear-gradient(135deg, #34d399, #10b981);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
  transition: transform 0.2s ease, box-shadow 0.25s ease, filter 0.2s ease;
}

#shareResultBtn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(16, 185, 129, 0.5), 0 0 14px rgba(16,185,129,0.22);
  filter: saturate(1.07);
}

body.dark #shareResultBtn {
  color: #052e2b;
}

/* ===================== */
/* SAVE BUTTON */
/* ===================== */
.save-tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, #facc15, #f59e0b);
  color: #1f2937;
  box-shadow: 0 6px 16px rgba(250, 204, 21, 0.35);
  transition: all 0.25s ease;
}

.save-tool-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(250, 204, 21, 0.45);
}

.save-tool-btn:active { transform: scale(0.96); }
.save-tool-btn:focus-visible { outline: 2px solid #facc15; outline-offset: 3px; }

/* ===================== */
/* OVERLAY INFO */
/* ===================== */
.overlay {
  position: absolute;
  top: 15px;
  left: 15px;
  background: rgba(0,0,0,0.35);
  color: #fff;
  padding: 6px 12px;
  border-radius: 10px;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5), 0 0 10px rgba(255,255,255,0.08);
  transition: background 0.3s ease, color 0.3s ease, box-shadow 0.35s ease;
}
body.dark .overlay { background: rgba(255,255,255,0.1); color: var(--accent); }

/* ===================== */
/* BATTERY BAR */
/* ===================== */
.battery-hud {
  margin: 0;
  max-width: none;
}

.battery-bar-track {
  height: 14px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.12);
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.08), 0 1px 5px rgba(2,132,199,0.14);
  overflow: hidden;
}

body.dark .battery-bar-track {
  background: rgba(0,0,0,0.35);
  box-shadow: inset 0 1px 4px rgba(0,0,0,0.5);
}

.battery-bar-fill {
  height: 100%;
  width: 100%;
  border-radius: 999px;
  transform-origin: left center;
  transition: width 0.35s ease-out, background-color 0.4s ease, box-shadow 0.4s ease;
}

.battery-bar-fill.battery-tier-high {
  background: linear-gradient(90deg, #16a34a, #22c55e);
  box-shadow: 0 0 12px rgba(34, 197, 94, 0.35);
}

.battery-bar-fill.battery-tier-mid {
  background: linear-gradient(90deg, #ea580c, #fb923c);
  box-shadow: 0 0 10px rgba(251, 146, 60, 0.35);
}

.battery-bar-fill.battery-tier-low {
  background: linear-gradient(90deg, #b91c1c, #ef4444);
  box-shadow: 0 0 10px rgba(239, 68, 68, 0.4);
}

/* ===================== */
/* LIVE TREND CHART (Chart.js) */
/* ===================== */
.sim-chart-wrap {
  position: relative;
  width: 100%;
  max-width: none;
  margin: 0;
}

@media (max-width: 980px) {
  .sim-layout {
    grid-template-columns: 1fr;
  }

  .sim-sidebar {
    order: 2;
  }

  .sim-main {
    order: 1;
  }

  .controls,
  .preset-row {
    justify-content: center;
  }

  .params {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px 18px;
  }
}

.sim-chart-wrap canvas {
  display: block;
  width: 100% !important;
  height: auto !important;
}

/* ===================== */
/* HEADER, THEME TOGGLE */
/* ===================== */
.tool-title img { vertical-align: middle; margin-right: 10px; }
.theme-toggle { display: flex; align-items: center; gap: 10px; }




body.fullscreen-active {
  overflow-y: auto;
}