/* ============================================================
   揭开黑箱 · 世界模型：真实世界和模型的梦并排跑，再一层层揭开
   复用 ../css/app.css 的配色、顶栏、调试器、控制条、算式板、图鉴；舞台是可以平移缩放的 2D 画布（同训练页）
   ============================================================ */


/* ---------------- 布局 ---------------- */

.w-app { position: fixed; z-index: 5; top: var(--top); left: 0; right: 0; bottom: 0; }
.w-app .stage { position: absolute; inset: 0; opacity: 1; pointer-events: auto; background: transparent; }
.w-app .gl canvas { touch-action: none; }
.gl.grabbing canvas { cursor: grabbing; }
.w-app .stage-top { z-index: 6; }
.w-app .stage-top > * { pointer-events: auto; }
.w-app .hint-btn { margin-left: auto; }

/* 章节切换（样式同训练页的两段训练切换） */
.chap { display: flex; gap: 3px; padding: 3px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line2); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.chap button { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.25; padding: 5px 11px; border-radius: 11px; border: 1px solid transparent; background: none; cursor: pointer; color: var(--dim); text-align: left; transition: color .2s, background .2s, border-color .2s; }
.chap button b { font-size: 12.5px; font-weight: 600; }
.chap button span { font-family: var(--mono); font-size: 10px; letter-spacing: .04em; }
.chap button:hover { color: var(--ink); }
.chap button.on { color: var(--ink); background: rgba(94, 240, 212, .08); border-color: rgba(94, 240, 212, .4); }
.chap button.on span { color: var(--acc); }

/* ---------------- D1 的开关 ---------------- */

.play-ui { position: absolute; z-index: 6; top: 64px; left: 14px; right: calc(var(--dbg-w) + 28px); display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; pointer-events: none; }
.play-ui > * { pointer-events: auto; }
body:not(.w-play) .play-ui, body:not(.w-play) .pad, body.w-probe .play-ui, body.w-probe .pad { display: none; }
.seg { display: inline-flex; padding: 2px; border-radius: 999px; border: 1px solid var(--line2); background: var(--panel); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.seg button { height: 28px; padding: 0 12px; border-radius: 999px; border: 0; background: none; color: var(--dim); font-size: 12.5px; cursor: pointer; transition: color .2s, background .2s; white-space: nowrap; }
.seg button:hover { color: var(--ink); }
.seg button.on { color: #04121a; background: var(--acc); font-weight: 600; }
#segEye button[data-eye="closed"].on { background: var(--amber); color: #1d1306; }
.pbtn { height: 32px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--line2); background: var(--panel); color: var(--ink2); font-size: 12.5px; cursor: pointer; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); transition: border-color .2s, color .2s; white-space: nowrap; }
.pbtn:hover { color: var(--ink); border-color: var(--line3); }
.tau { display: inline-flex; align-items: center; gap: 8px; height: 32px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--line2); background: var(--panel); color: var(--ink2); font-size: 12.5px; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.tau input { width: 96px; accent-color: var(--amber); }
.tau b { font-weight: 400; color: var(--amber); min-width: 2.6em; }

/* 方向键：桌面上是左下角两个小按钮，手机上是两侧的大按钮 */
.pad { position: absolute; z-index: 6; left: 14px; bottom: 112px; display: flex; gap: 8px; }
.pad button { width: 48px; height: 40px; border-radius: 12px; border: 1px solid var(--line2); background: var(--panel); color: var(--ink2); font-size: 16px; cursor: pointer; touch-action: none; user-select: none; -webkit-user-select: none; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); transition: background .15s, border-color .15s, color .15s; }
.pad button:hover { color: var(--ink); border-color: var(--line3); }
.pad button.on { background: rgba(255, 182, 92, .2); border-color: rgba(255, 182, 92, .7); color: var(--amber); }

/* ---------------- 第二章 ---------------- */

.probe-host { position: absolute; z-index: 3; top: 64px; left: 14px; right: calc(var(--dbg-w) + 28px); bottom: 104px; }
body.dbg-folded .probe-host { right: 14px; }
body.w-probe .gl, body.w-probe #btnFollow { visibility: hidden; }
body.w-probe .ctl-play, body.w-probe .ctl-speed, body.w-probe .ctl-pos, body.w-probe .ctl-track { display: none; }
body.w-probe .ctl-depth { border-right: 0; padding-right: 0; }
.probe-soon { height: 100%; display: grid; place-content: center; justify-items: center; gap: 6px; padding: 24px; text-align: center; border-radius: 16px; border: 1px dashed var(--line2); background: rgba(5, 11, 23, .7); }
.probe-soon h2 { margin: 2px 0 6px; font-family: var(--serif); font-weight: 900; font-size: 26px; letter-spacing: .04em; color: var(--ink); }
.probe-soon p { max-width: 520px; margin: 0; font-size: 14px; line-height: 1.75; color: var(--ink2); }
.probe-soon .soon { margin-top: 12px; padding: 4px 14px; border-radius: 999px; border: 1px dashed rgba(255, 182, 92, .6); color: var(--amber); font-size: 13px; }

/* ---------------- 提示、算式板 ---------------- */

.w-app .stage-hint { top: auto; bottom: 120px; }
#toasts { left: auto; right: calc(var(--dbg-w) + 40px); top: calc(var(--top) + 58px); bottom: auto; width: min(320px, calc(100vw - 36px)); flex-direction: column; }
body.dbg-folded #toasts { right: 18px; }
.toast { padding: 9px 12px; }
.toast .t-text { display: none; }
.w-app .board { bottom: 104px; max-height: min(400px, calc(100% - 360px)); }
body.has-board .pad { display: none; }
.board .bd-big { font-size: 13.5px; }
.board .bd-tr .i { font-size: 10.5px; overflow: hidden; text-overflow: ellipsis; }
/* 项的名字比推理页长（c7·25,23 这样），第一列放宽 */
.w-app .bd-tr { grid-template-columns: 5.6em minmax(4.6em, 1fr) .9em minmax(5em, 1fr) .9em minmax(4.6em, 1fr) minmax(34px, .8fr); }

/* ---------------- 窄屏 ---------------- */

@media (max-width: 1180px) {
  .chap button span { display: none; }
  .tau input { width: 72px; }
}
@media (max-width: 900px) {
  .w-app .stage-top { right: 10px; left: 10px; top: 8px; }
  .chap { width: 100%; }
  .chap button { flex: 1; align-items: center; padding: 5px 6px; }
  .chap button b { font-size: 12px; }
  .play-ui { top: 52px; left: 8px; right: 8px; gap: 6px; }
  .seg button { height: 26px; padding: 0 9px; font-size: 12px; }
  .pbtn { height: 30px; padding: 0 10px; font-size: 12px; }
  .tau { height: 30px; padding: 0 10px; gap: 6px; font-size: 12px; }
  .tau span { display: none; }
  .tau input { width: 64px; }
  .pad { left: 8px; right: 8px; bottom: 152px; justify-content: space-between; pointer-events: none; }
  .pad button { pointer-events: auto; width: 76px; height: 54px; border-radius: 16px; font-size: 20px; background: rgba(10, 17, 31, .86); }
  .probe-host { top: 52px; left: 8px; right: 8px; bottom: 150px; }
  .w-app .dbg { bottom: 100px; }
  .w-app .dbg.folded { bottom: 100px; }
  .w-app .stage-hint { bottom: 170px; top: auto; }
  #toasts { left: 10px; right: 10px; width: auto; top: auto; bottom: 200px; }
  .w-app .board { top: 52px; bottom: auto; max-height: min(42vh, 340px); }
  .w-app .bd-tr { grid-template-columns: 4.8em minmax(4.2em, 1fr) .8em minmax(4.6em, 1fr) .8em minmax(4.2em, 1fr) 24px; }
}
@media (max-width: 560px) {
  .crumbs { display: none; }
}
@media (max-width: 420px) {
  .seg button { padding: 0 7px; }
  #segAuto button { padding: 0 6px; }
}
/* 英文模式：拉丁字体排在中文字体前面（中文字体里的弯引号、撇号是全角的，夹在英文里会空出一大块）；衬线标题里的英文用直引号 */
html[lang="en"] { --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Liberation Sans", "DejaVu Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif; }
html[lang="en"] .brand-zh { display: none; }   /* 英文面包屑更长（“D5 One multiply-add”）；导航里已经高亮了 World Models，把位置让给面包屑 */
/* 英文模式的手机图鉴：标题和页脚都比中文长，标题单独占一行、页脚上下排，给卡片留出位置 */
@media (max-width: 560px) {
  html[lang="en"] .cx-head { flex-wrap: wrap; row-gap: 10px; padding-bottom: 12px; }
  html[lang="en"] .cx-head > div:first-child { flex: 1 1 100%; }
  html[lang="en"] .cx-head h2 { font-size: 21px; letter-spacing: .01em; }
  html[lang="en"] .cx-progress { margin-left: 0; flex: 1; flex-direction: row; align-items: center; gap: 12px; }
  html[lang="en"] .cx-foot { flex-direction: column; align-items: flex-start; gap: 6px; padding: 10px 24px; }
  html[lang="en"] .cx-foot p { font-size: 11px; line-height: 1.5; }
}
@media (max-width: 900px) {
  html[lang="en"] .chap button { min-width: 0; }
  html[lang="en"] .chap button b { font-size: 11.5px; max-width: 100%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
}