:root {
  --bg-dark: #0a0a1a;
  --bg-panel: rgba(15, 15, 35, 0.85);
  --border: rgba(100, 100, 180, 0.15);
  --border-light: rgba(100, 100, 180, 0.3);
  --text: #e0e0f0;
  --text-dim: #8888aa;
  --text-bright: #ffffff;
  --accent: #00d4ff;
  --accent-2: #7c3aed;
  --accent-green: #00ffaa;
  --danger: #ff4757;
  --warning: #ffd93d;
  --safe: #00ffaa;
  --font: 'Inter', sans-serif;
  --sidebar-width: 360px;
  --radius: 12px;
  --radius-sm: 8px;
}

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

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

.app {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: linear-gradient(180deg, #0d0d26 0%, #080814 100%);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  z-index: 10;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 10, 30, 0.5);
}

.logo-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: var(--radius-sm);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.15);
}

.logo-text h1 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.2;
}

.logo-text p {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 2px;
}

/* Scrollable Sidebar Content */
.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  scrollbar-width: thin;
  scrollbar-color: rgba(100, 100, 180, 0.25) transparent;
}

.sidebar-scroll::-webkit-scrollbar {
  width: 4px;
}

.sidebar-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-scroll::-webkit-scrollbar-thumb {
  background: rgba(100, 100, 180, 0.25);
  border-radius: 4px;
}

.sidebar-scroll::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 212, 255, 0.4);
}

/* Panels */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 10px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.panel:hover {
  border-color: var(--border-light);
}

.panel-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 10px;
}

/* Steering Display */
.steering-value {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
  margin-bottom: 8px;
  text-align: center;
}

/* Sliders */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(20, 20, 50, 0.8);
  border: 1px solid var(--border);
  border-radius: 3px;
  outline: none;
  transition: background 0.2s;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.6);
  cursor: grab;
  border: none;
  transition: transform 0.1s ease;
}

.slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.15);
}

.slider.slider-accent::-webkit-slider-thumb {
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.7);
}

/* Vertical Slider & Throttle Widget Styles */
.vertical-slider-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 6px 0;
}

.v-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.v-label.top { color: var(--accent-green); }
.v-label.bottom { color: var(--warning); }

.v-slider-box {
  width: 40px;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.slider-vertical {
  -webkit-appearance: none;
  appearance: none;
  width: 130px;
  height: 8px;
  background: linear-gradient(90deg, var(--warning) 0%, rgba(20, 20, 50, 0.8) 50%, var(--accent-green) 100%);
  border: 1px solid var(--border);
  border-radius: 4px;
  outline: none;
  transform: rotate(-90deg);
  cursor: grab;
}

.slider-vertical::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.8);
  cursor: grab;
}

.v-value-display {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 4px;
}

.v-value-display strong {
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

/* Floating Canvas Throttle Widget */
.canvas-throttle-widget {
  position: absolute;
  top: 60px;
  left: 14px;
  background: rgba(12, 12, 30, 0.85);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 10px;
  z-index: 4;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.throttle-label {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.throttle-label.top { color: var(--accent-green); }
.throttle-label.bottom { color: var(--warning); }

.throttle-slider-box {
  width: 36px;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slider-vertical-canvas {
  -webkit-appearance: none;
  appearance: none;
  width: 150px;
  height: 8px;
  background: linear-gradient(90deg, var(--warning) 0%, rgba(20, 20, 50, 0.8) 50%, var(--accent-green) 100%);
  border: 1px solid var(--border);
  border-radius: 4px;
  outline: none;
  transform: rotate(-90deg);
  cursor: grab;
}

.slider-vertical-canvas::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.8);
  cursor: grab;
}

.throttle-val-badge {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(0, 212, 255, 0.12);
  padding: 3px 8px;
  border-radius: 10px;
  border: 1px solid rgba(0, 212, 255, 0.3);
  margin-top: 2px;
}

/* Speedometer Styles */
.speedometer-box {
  background: rgba(10, 10, 25, 0.85);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.speed-readout {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.speed-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font);
  letter-spacing: -1px;
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.5);
  font-variant-numeric: tabular-nums;
}

.speed-unit {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dim);
}

.speed-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(20, 20, 50, 0.9);
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.speed-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-green) 100%);
  transition: width 0.1s ease-out;
  border-radius: 3px;
}

.speed-status {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
}

/* Steering Wheel Container & SVG Rotation */
.steering-wheel-container {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.steering-wheel-wrapper {
  width: 86px;
  height: 86px;
  position: relative;
  flex-shrink: 0;
}

.steering-wheel-svg {
  width: 100%;
  height: 100%;
  transition: transform 0.05s ease-out;
  transform-origin: center center;
  filter: drop-shadow(0 4px 10px rgba(0,0,0,0.6));
}

.steering-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.turn-count-badge {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

/* Floating Canvas Steering Wheel Widget */
.canvas-wheel-widget {
  position: absolute;
  top: 60px;
  left: 95px;
  background: rgba(12, 12, 30, 0.85);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  z-index: 4;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.c-wheel-box {
  width: 66px;
  height: 66px;
}

.canvas-wheel-svg {
  width: 100%;
  height: 100%;
  transition: transform 0.05s ease-out;
  transform-origin: center center;
}

.c-wheel-badge {
  font-size: 10px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(0, 212, 255, 0.12);
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.6);
  cursor: grab;
  border: none;
  transition: transform 0.1s ease;
}

.slider::-moz-range-thumb:active {
  cursor: grabbing;
  transform: scale(1.15);
}

.slider::-moz-range-track {
  height: 6px;
  background: rgba(20, 20, 50, 0.8);
  border: 1px solid var(--border);
  border-radius: 3px;
}

.slider.slider-accent::-moz-range-thumb {
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.7);
}

/* Select Preset Dropdown */
.select-preset {
  width: 100%;
  padding: 8px 10px;
  background: rgba(20, 20, 50, 0.8);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.select-preset:hover {
  border-color: var(--accent);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.2);
}

.select-preset option,
.select-preset optgroup {
  background: #0f0f23;
  color: var(--text);
  font-weight: normal;
}

.select-preset optgroup {
  color: var(--text-dim);
  font-weight: 700;
}

/* Buttons & Button Groups */
.btn {
  padding: 8px 12px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: rgba(20, 20, 45, 0.6);
  color: var(--text);
  font-size: 11px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  user-select: none;
}

.btn:hover {
  background: rgba(35, 35, 75, 0.8);
  border-color: var(--accent);
  color: var(--text-bright);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.2);
}

.btn:active {
  transform: translateY(1px);
}

.btn.active,
.btn-course.active {
  background: rgba(0, 212, 255, 0.15);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.25);
}

.btn-dir.active[data-dir="reverse"] {
  background: rgba(255, 165, 0, 0.18);
  border-color: #ffa500;
  color: #ffa500;
  box-shadow: 0 0 10px rgba(255, 165, 0, 0.3);
}

.btn-primary {
  background: rgba(0, 212, 255, 0.12);
  border-color: rgba(0, 212, 255, 0.4);
  color: var(--accent);
}

.btn-primary:hover {
  background: rgba(0, 212, 255, 0.25);
  border-color: var(--accent);
  color: #ffffff;
}

.btn-danger {
  border-color: rgba(255, 71, 87, 0.4);
  color: var(--danger);
  background: rgba(255, 71, 87, 0.08);
}

.btn-danger:hover {
  background: rgba(255, 71, 87, 0.25);
  border-color: var(--danger);
  color: #ffffff;
  box-shadow: 0 0 8px rgba(255, 71, 87, 0.3);
}

.btn-tool {
  border-color: rgba(0, 255, 170, 0.4);
  color: var(--accent-green);
  background: rgba(0, 255, 170, 0.08);
}

.btn-tool:hover {
  background: rgba(0, 255, 170, 0.25);
  border-color: var(--accent-green);
  color: #ffffff;
  box-shadow: 0 0 8px rgba(0, 255, 170, 0.3);
}

.btn-tool.active {
  background: rgba(0, 255, 170, 0.2);
  border-color: var(--accent-green);
  color: var(--accent-green);
  font-weight: 600;
  box-shadow: 0 0 10px rgba(0, 255, 170, 0.3);
}

.btn-sm {
  padding: 6px 8px;
  font-size: 10px;
}

.btn-group-3,
.btn-group {
  display: flex;
  gap: 6px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.btn-group-3 .btn,
.btn-group .btn {
  flex: 1;
  min-width: 0;
}

/* Radio Options */
.radio-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  cursor: pointer;
  font-size: 12px;
  color: var(--text);
  user-select: none;
  transition: color 0.2s ease;
}

.radio-option:hover {
  color: var(--text-bright);
}

.radio-option input[type="radio"] {
  display: none;
}

.radio-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--border-light);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s ease;
  position: relative;
}

.radio-option input[type="radio"]:checked + .radio-dot {
  border-color: var(--accent);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.4);
}

.radio-option input[type="radio"]:checked + .radio-dot::after {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: block;
}

/* Parameter Rows */
.param-row {
  margin-bottom: 12px;
}

.param-row:last-child {
  margin-bottom: 0;
}

.param-row label {
  display: block;
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.param-control {
  display: flex;
  align-items: center;
  gap: 10px;
}

.param-control .slider {
  flex: 1;
}

.param-value {
  min-width: 52px;
  text-align: right;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.total-length-box {
  margin-top: 10px;
  padding: 8px 10px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px dashed rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-dim);
}

.total-length-box strong {
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

/* Hints & Utilities */
.hint {
  font-size: 10px;
  color: var(--accent-green);
  background: rgba(0, 255, 170, 0.08);
  border: 1px solid rgba(0, 255, 170, 0.2);
  border-radius: var(--radius-sm);
  padding: 8px;
  margin-top: 8px;
  text-align: center;
}

.hidden {
  display: none !important;
}

/* Main Area */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #0d0d20;
  position: relative;
  height: 100vh;
  overflow: hidden;
}

/* Top Bar */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(10, 10, 25, 0.9);
  border-bottom: 1px solid var(--border);
  z-index: 5;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.top-label {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.top-mode {
  display: block;
  font-size: 14px;
  color: var(--accent);
  margin-top: 2px;
  font-weight: 600;
}

.mouse-mode {
  font-size: 11px;
  color: var(--text-dim);
}

.mouse-mode strong {
  color: var(--text-bright);
}

/* Collision Badge */
.collision-badge {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.5px;
}

.collision-badge.safe {
  background: rgba(0, 255, 170, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(0, 255, 170, 0.3);
}

.collision-badge.collision {
  background: rgba(255, 71, 87, 0.15);
  color: var(--danger);
  border: 1px solid rgba(255, 71, 87, 0.4);
  animation: pulse-danger 1s infinite alternate;
}

@keyframes pulse-danger {
  0% {
    box-shadow: 0 0 4px rgba(255, 71, 87, 0.4);
  }
  100% {
    box-shadow: 0 0 16px rgba(255, 71, 87, 0.8);
  }
}

/* Canvas Wrapper */
.canvas-wrapper {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at center, #12122b 0%, #090918 100%);
}

#simCanvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
}

#simCanvas.dragging-car {
  cursor: grabbing;
}

#simCanvas.drawing-mode {
  cursor: crosshair;
}

/* Legend Overlay */
.legend {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(12, 12, 30, 0.85);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 11px;
  z-index: 3;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
  color: var(--text-dim);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.legend-line {
  width: 18px;
  border-top: 2px solid;
  display: inline-block;
  flex-shrink: 0;
}

.legend-line.dashed {
  border-top-style: dashed;
}

/* Distance Panel */
.dist-panel {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(12, 12, 30, 0.85);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  z-index: 3;
  min-width: 180px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.dist-panel h4 {
  font-size: 9px;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  margin-bottom: 10px;
  font-weight: 700;
  text-transform: uppercase;
}

.dist-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.dist-cell {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.dist-label {
  font-size: 10px;
  color: var(--text-dim);
}

.dist-val {
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-dim);
  transition: color 0.2s ease;
}

.dist-val.safe {
  color: var(--accent-green);
}

.dist-val.warning {
  color: var(--warning);
}

.dist-val.danger {
  color: var(--danger);
  animation: blink 0.8s infinite;
}

@keyframes blink {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Bottom Hint Bar */
.bottom-hint {
  padding: 8px 16px;
  text-align: center;
  font-size: 10px;
  color: var(--text-dim);
  background: rgba(10, 10, 25, 0.9);
  border-top: 1px solid var(--border);
  font-weight: 400;
}

/* ===== Panel hướng dẫn & FAQ ===== */
.guide-open-btn{position:fixed;right:14px;bottom:14px;z-index:40;padding:10px 16px;
  border:1px solid rgba(255,255,255,.18);border-radius:10px;background:#1e293b;color:#e2e8f0;
  font:600 13px/1 var(--font,system-ui);cursor:pointer;box-shadow:0 4px 14px #0006}
.guide-open-btn:hover{background:#27364b;border-color:#60a5fa}
.guide-overlay{position:fixed;inset:0;z-index:50;background:#000a;display:none;
  overflow-y:auto;padding:24px 16px}
.guide-overlay.open{display:block}
.guide-box{position:relative;max-width:820px;margin:0 auto;background:#111826;color:#dbe2ea;
  border:1px solid #26324a;border-radius:14px;padding:32px 34px 24px;font-size:15px;line-height:1.72}
.guide-box h2{margin:30px 0 10px;font-size:21px;color:#fff;line-height:1.35}
.guide-box h2:first-of-type{margin-top:4px}
.guide-box h3{margin:22px 0 6px;font-size:16.5px;color:#93c5fd}
.guide-box p{margin:0 0 12px}
.guide-box ul,.guide-box ol{margin:0 0 14px;padding-left:22px}
.guide-box li{margin-bottom:7px}
.guide-box strong{color:#fff}
.guide-box em{color:#a5b4c8}
.guide-box kbd{background:#24314a;border:1px solid #3a4a68;border-radius:4px;
  padding:1px 6px;font-size:12.5px;font-family:ui-monospace,monospace}
.guide-close{position:absolute;top:12px;right:14px;width:34px;height:34px;border-radius:8px;
  border:1px solid #2f3b52;background:#1b2436;color:#c7d2e0;font-size:16px;cursor:pointer}
.guide-close:hover{background:#2a3550;color:#fff}
.guide-footer{margin-top:28px;padding-top:14px;border-top:1px solid #24314a;
  font-size:13px;color:#8695ab}
@media(max-width:640px){.guide-box{padding:26px 18px 18px;font-size:14.5px}
  .guide-box h2{font-size:19px}}