/* ================================================================
 * 闻达伴学 · 中考物理实验室 · 皮肤 v1.0
 * junior-ui.css
 * ================================================================ */

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: #1d1d1f;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
body {
  background: linear-gradient(180deg, #fff8ec 0%, #ffffff 60%, #f5f9ff 100%);
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ============ 顶部栏 ============ */
.j-header {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: #fff;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
  flex-shrink: 0;
}
.j-brand {
  display: flex; align-items: center; gap: 10px;
}
.j-brand img {
  height: 26px;
}
.j-brand-text {
  display: flex; flex-direction: column;
  line-height: 1.1;
}
.j-brand-name {
  font-size: 15px; font-weight: 700; color: #2e6fb8;
}
.j-brand-sub {
  font-size: 11px; color: #ff9f43; letter-spacing: 0.5px;
}
.j-nav-links {
  display: flex; gap: 8px;
  font-size: 13px;
}
.j-nav-links a {
  padding: 6px 14px;
  border-radius: 18px;
  background: rgba(46,111,184,0.08);
  color: #2e6fb8;
  font-weight: 500;
  transition: all 0.15s;
}
.j-nav-links a:hover {
  background: rgba(46,111,184,0.15);
}
.j-nav-links a.back {
  background: rgba(255,159,67,0.12);
  color: #ff7f11;
}

/* ============ 主体三栏布局 ============ */
.j-main {
  height: calc(100vh - 56px);
  display: flex;
}
/* embed 模式（iframe 内嵌到 landing 时）取消顶部栏 */
body.embed .j-header { display: none; }
body.embed .j-main { height: 100vh; }

/* ============ 左侧栏（sim 列表）============ */
.j-sidebar {
  width: 240px;
  background: #fafbfc;
  border-right: 1px solid rgba(0,0,0,0.06);
  overflow-y: auto;
  padding: 12px 0;
  flex-shrink: 0;
}
.j-sidebar-title {
  padding: 8px 16px 12px;
  font-size: 13px;
  color: #666;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.j-group {
  margin: 0 0 6px;
}
.j-group-label {
  padding: 8px 16px 6px;
  font-size: 12px;
  color: #999;
  font-weight: 700;
  letter-spacing: 1px;
  display: flex; align-items: center; gap: 6px;
}
.j-sim-item {
  padding: 8px 16px 8px 24px;
  font-size: 13px;
  color: #1d1d1f;
  cursor: pointer;
  display: flex; align-items: center; gap: 8px;
  transition: all 0.12s;
  border-left: 3px solid transparent;
  position: relative;
}
.j-sim-item:hover {
  background: rgba(46,111,184,0.06);
  color: #2e6fb8;
}
.j-sim-item.active {
  background: linear-gradient(90deg, rgba(255,159,67,0.15) 0%, rgba(255,159,67,0) 100%);
  color: #ff7f11;
  font-weight: 600;
  border-left-color: #ff9f43;
}
.j-sim-emoji {
  font-size: 15px;
  width: 20px;
  text-align: center;
}
.j-sim-name {
  flex: 1;
}
.j-sim-badge {
  font-size: 10px;
  background: #2e6fb8;
  color: #fff;
  padding: 1px 6px;
  border-radius: 8px;
  font-weight: 500;
}
.j-sim-badge.new {
  background: #ff9f43;
}
.j-sim-badge.hot {
  background: #e74c3c;
}

/* ============ 中部主区（canvas 展示）============ */
.j-workspace {
  flex: 1;
  display: flex; flex-direction: column;
  background: #f7f8fa;
  min-width: 0;
  overflow: hidden;
}
.j-sim-header {
  padding: 12px 20px;
  background: #fff;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  display: flex; align-items: center; justify-content: space-between;
  flex-shrink: 0;
}
.j-sim-title {
  font-size: 18px; font-weight: 700; color: #1d1d1f;
}
.j-sim-desc {
  font-size: 13px; color: #666; margin-top: 3px;
}
.j-sim-actions {
  display: flex; gap: 8px;
}
.j-btn {
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.1);
  background: #fff;
  color: #1d1d1f;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex; align-items: center; gap: 4px;
}
.j-btn:hover { background: #f5f5f7; border-color: rgba(0,0,0,0.2); }
.j-btn.primary { background: #ff9f43; color: #fff; border-color: #ff9f43; }
.j-btn.primary:hover { background: #e88a1d; }
.j-btn.ghost { background: transparent; border-color: rgba(46,111,184,0.3); color: #2e6fb8; }

.j-canvas-wrap {
  flex: 1;
  position: relative;
  padding: 12px;
  overflow: hidden;
}
#sim-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: #1a1a2e;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
#fps-display {
  position: absolute;
  bottom: 20px; right: 20px;
  padding: 3px 8px;
  background: rgba(0,0,0,0.4);
  color: rgba(255,255,255,0.7);
  font-size: 11px;
  font-family: 'SF Mono', Menlo, monospace;
  border-radius: 4px;
  pointer-events: none;
}

/* 中考考点标签 */
.j-exam-tag {
  position: absolute;
  bottom: 20px; left: 24px;
  padding: 4px 10px;
  background: rgba(255,159,67,0.9);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: 12px;
  pointer-events: none;
}

/* ============ 右侧控件面板 ============ */
.j-controls {
  width: 280px;
  background: #fff;
  border-left: 1px solid rgba(0,0,0,0.06);
  overflow-y: auto;
  padding: 16px;
  flex-shrink: 0;
}
.j-controls-title {
  font-size: 14px;
  font-weight: 700;
  color: #1d1d1f;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  display: flex; align-items: center; gap: 6px;
}
.control-group {
  margin-bottom: 18px;
}
.control-label {
  font-size: 12px;
  color: #666;
  margin-bottom: 6px;
  display: flex; align-items: center; justify-content: space-between;
}
.control-label strong {
  color: #2e6fb8;
  font-weight: 600;
}
.control-slider {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: #e5e7eb;
  border-radius: 2px;
  outline: none;
}
.control-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  background: #ff9f43;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}
.control-slider::-moz-range-thumb {
  width: 16px; height: 16px;
  background: #ff9f43;
  border-radius: 50%;
  cursor: pointer;
  border: none;
}
.control-buttons {
  display: flex; gap: 6px;
  flex-wrap: wrap;
}
.control-btn {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.1);
  background: #f5f5f7;
  color: #1d1d1f;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}
.control-btn:hover { background: #e5e5ea; }
.control-btn.active {
  background: #2e6fb8;
  color: #fff;
  border-color: #2e6fb8;
}
.readout-list {
  background: #f7f8fa;
  border-radius: 8px;
  padding: 10px 12px;
}
.readout-item {
  display: flex; justify-content: space-between;
  padding: 4px 0;
  font-size: 13px;
}
.readout-item .k { color: #666; }
.readout-item .v {
  font-weight: 700;
  color: #ff9f43;
  font-family: 'SF Mono', Menlo, monospace;
}

/* 知识点卡片 */
.knowledge-card {
  background: linear-gradient(135deg, #fff8ec 0%, #fff 100%);
  border: 1px solid rgba(255,159,67,0.3);
  border-radius: 8px;
  padding: 12px;
  margin-top: 12px;
}
.knowledge-card .kc-title {
  font-size: 12px;
  font-weight: 700;
  color: #ff7f11;
  margin-bottom: 6px;
  display: flex; align-items: center; gap: 4px;
}
.knowledge-card .kc-body {
  font-size: 12px;
  color: #444;
  line-height: 1.6;
}
.knowledge-card .formula {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(46,111,184,0.1);
  color: #2e6fb8;
  border-radius: 4px;
  font-weight: 600;
  font-family: 'SF Mono', Menlo, monospace;
  margin: 0 2px;
}

/* ============ 底部欢迎/空态 ============ */
.j-welcome {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 40px;
  text-align: center;
}
.j-welcome-emoji { font-size: 80px; margin-bottom: 16px; }
.j-welcome h1 {
  font-size: 26px;
  color: #1d3557;
  margin-bottom: 8px;
  font-weight: 800;
}
.j-welcome p {
  color: #666;
  font-size: 14px;
  max-width: 480px;
  line-height: 1.7;
}
.j-welcome-tags {
  display: flex; gap: 6px; flex-wrap: wrap; justify-content: center;
  margin-top: 20px;
}
.j-welcome-tag {
  padding: 4px 12px;
  background: rgba(46,111,184,0.08);
  color: #2e6fb8;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

/* ============ 移动端适配 ============ */
@media (max-width: 900px) {
  .j-sidebar { width: 68px; }
  .j-sidebar-title { display: none; }
  .j-group-label { font-size: 10px; padding: 8px 8px 4px; }
  .j-sim-name { display: none; }
  .j-sim-badge { display: none; }
  .j-sim-item { padding: 10px 8px; justify-content: center; }
  .j-controls { width: 240px; }
}
@media (max-width: 700px) {
  .j-controls { display: none; }
  .j-controls.mobile-open {
    display: block;
    position: fixed;
    right: 0; top: 56px; bottom: 0;
    z-index: 100;
    box-shadow: -4px 0 20px rgba(0,0,0,0.15);
  }
  .j-brand-sub { display: none; }
}