/* ============================================================
   1) 账号外壳：登录闸门 / 设置半窗 / 激活门（原样沿用，浅色体系）
   ============================================================ */
/* ============ 设计基调：奶油考卷纸 × 朱砂红章 × 集星闯关 ============ */
:root{
  --paper:#FBF6EC;
  --paper-2:#F4EDDD;
  --ink:#26221B;
  --ink-2:#6B6257;
  --line:#E4DAC6;
  --red:#D8432C;
  --red-deep:#B02E26;
  --gold:#B08A3E;
  --gold-soft:#F0E3C4;
  --jade:#1F8A4C;
  --jade-soft:#E2F1E6;
  --blue:#2B4C7E;
  --blue-soft:#E3EAF4;
  --r-lg:22px;
  --r-md:14px;
  --shadow-card:0 2px 0 var(--line), 0 10px 28px rgba(90,74,40,.10);
  --ease-out:cubic-bezier(.22,1,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{font-size:16px}
body{
  font-family:-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--paper);
  color:var(--ink);
  min-height:100vh;
  padding-bottom:calc(28px + env(safe-area-inset-bottom));
}
.wrap{max-width:620px;margin:0 auto;padding:0 18px}


/* ---------- 登录页（逐字移植 app/src/styles/login.css，映射原 tokens） ---------- */
.lg-gate{
  --lg-paper:#F5F2EC; --lg-card:#FFFFFF; --lg-card-sub:#FBF9F5; --lg-line:#ECE6DC;
  --lg-t1:#211C16; --lg-t2:#6B6258; --lg-t3:#9C9286;
  --lg-brand:#2C54C8; --lg-brand-line:#C5D6F6; --lg-brand-strong:#1E3F9E;
  --lg-err:#D24634; --lg-err-weak:#FBEDEB; --lg-ok:#14855F; --lg-gold:#B07216;
  min-height:100vh; min-height:100dvh;
  display:flex; align-items:center; justify-content:center; padding:24px;
  background-color:var(--lg-paper);
  background-image:radial-gradient(130% 120% at 50% 0%, rgba(255,255,255,.55), transparent 55%);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  animation:lgGateIn .3s ease;
}
@keyframes lgGateIn{from{opacity:0}to{opacity:1}}
.lg-card{
  width:100%; max-width:360px; background:var(--lg-card);
  border-radius:26px; padding:22px 24px 6px; text-align:center; position:relative;
  box-shadow:0 24px 70px rgba(33,28,22,.18), 0 2px 8px rgba(0,0,0,.05);
  border:.5px solid rgba(255,255,255,.6);
  animation:lgSheetIn .46s cubic-bezier(.32,.72,0,1);
}
@keyframes lgSheetIn{from{opacity:0;transform:translateY(22px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}
.lg-view{animation:lgViewIn .3s cubic-bezier(.32,.72,0,1)}
@keyframes lgViewIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.lg-hero{margin-bottom:14px}
.lg-title{font-size:27px;font-weight:700;letter-spacing:-.4px;color:var(--lg-t1);margin:0}
.lg-subtitle{font-size:14.5px;color:var(--lg-t3);margin:5px 0 0;line-height:1.45}
.lg-line{width:36px;height:3px;background:var(--lg-gold);border-radius:2px;margin:10px auto 0}
.lg-form{display:flex;flex-direction:column}
.lg-group{
  background:var(--lg-card-sub); border-radius:15px; overflow:hidden;
  border:1px solid var(--lg-line); box-shadow:0 1px 2px rgba(0,0,0,.03);
  transition:border-color .2s, box-shadow .2s; text-align:left;
}
.lg-field{position:relative}
.lg-field + .lg-field{border-top:.5px solid var(--lg-line)}
.lg-input{
  width:100%; padding:14px 16px; font-size:16px; font-weight:500;
  background:transparent; border:none; outline:none; color:var(--lg-t1);
  font-family:inherit; transition:background .18s;
}
.lg-input::placeholder{color:var(--lg-t3);font-size:14px;font-weight:400}
.lg-input.code::placeholder{font-size:13px}
.lg-input:focus{background:rgba(44,84,200,.04)}
.lg-input.invalid{color:var(--lg-err)}
.lg-group:focus-within{border-color:var(--lg-brand-line);box-shadow:0 0 0 3px rgba(44,84,200,.12)}
.lg-pw-toggle{
  position:absolute; right:10px; top:50%; transform:translateY(-50%);
  background:rgba(33,28,22,.05); border:none; border-radius:8px; padding:7px 12px;
  font-size:12.5px; font-weight:500; color:var(--lg-t2); cursor:pointer; font-family:inherit;
  transition:background .18s,color .18s,transform .12s; line-height:1; z-index:1;
  user-select:none; -webkit-user-select:none; -webkit-tap-highlight-color:transparent;
}
.lg-pw-toggle:hover{background:rgba(33,28,22,.1);color:var(--lg-t1)}
.lg-pw-toggle:active{background:rgba(33,28,22,.14);color:var(--lg-t1);transform:translateY(-50%) scale(.95)}
.lg-hint{font-size:12px;margin:7px 4px 0;text-align:left;line-height:1.4;color:var(--lg-t3)}
.lg-hint.error{color:var(--lg-err)}
.lg-hint.success{color:var(--lg-ok)}
.lg-error{
  margin:14px 2px 0; padding:10px 12px; font-size:13px; color:var(--lg-err);
  background:var(--lg-err-weak); border-radius:12px; text-align:center; line-height:1.4;
}
.lg-primary{
  width:100%; margin-top:20px; padding:15px; font-size:16px; font-weight:600;
  color:#fff; border:none; border-radius:16px;
  background-color:var(--lg-brand);
  background-image:linear-gradient(180deg,var(--lg-brand) 0%,var(--lg-brand-strong) 100%);
  box-shadow:0 6px 18px rgba(30,63,158,.24), 0 1px 2px rgba(0,0,0,.08), inset 0 1px 0 rgba(255,255,255,.1);
  cursor:pointer; font-family:inherit; letter-spacing:.4px;
  transition:transform .12s ease, background .2s, box-shadow .2s, opacity .2s;
  -webkit-tap-highlight-color:transparent;
}
.lg-primary:hover:not(:disabled){background-color:var(--lg-brand-strong)}
.lg-primary:active:not(:disabled){transform:translateY(1px) scale(.985)}
.lg-primary:disabled{opacity:.55;cursor:not-allowed;box-shadow:none;background-image:none}
.lg-primary--login{display:block;width:min(78%,320px);margin:15px auto 0;border-radius:12px}
.lg-remember{
  display:flex; align-items:flex-start; gap:6px; font-size:12px; color:var(--lg-t3);
  line-height:1.5; margin:18px 0 22px; text-align:left; cursor:pointer;
}
.lg-remember input{margin-top:2px}
.lg-switch{margin-top:16px;display:flex;align-items:center;justify-content:center;gap:4px;font-size:13px}
.lg-form > .lg-switch:first-child{margin-top:16px;margin-bottom:18px}
.lg-view > .lg-switch{margin-top:22px}
.lg-switch-text{color:var(--lg-t3)}
.lg-link{
  background:none;border:none;cursor:pointer;color:var(--lg-brand);
  font-size:13px;font-weight:600;font-family:inherit;padding:2px 4px;
  -webkit-tap-highlight-color:transparent;
}
.lg-link:active{opacity:.6}
.lg-footer{margin-top:16px;padding-top:13px;border-top:.5px solid var(--lg-line)}
.lg-help-btn{
  position:absolute; top:14px; left:16px;
  background:rgba(61,43,31,.06); border:1px solid rgba(61,43,31,.12);
  color:var(--lg-t2); font-size:12px; font-weight:600; padding:5px 10px;
  border-radius:10px; cursor:pointer; line-height:1.4; transition:.15s;
  letter-spacing:.5px; font-family:inherit; -webkit-tap-highlight-color:transparent;
}
.lg-help-btn:hover{background:var(--lg-brand);color:#fff;border-color:var(--lg-brand)}
.lg-sheet-overlay{
  position:fixed; inset:0; background:rgba(0,0,0,.45);
  backdrop-filter:blur(2px); -webkit-backdrop-filter:blur(2px);
  z-index:10000; display:flex; align-items:flex-end; justify-content:center;
  animation:lgFade .2s ease;
}
@keyframes lgFade{from{opacity:0}to{opacity:1}}
.lg-sheet{
  position:relative; width:100%; max-width:560px; max-height:85vh; background:#fff;
  border-radius:18px 18px 0 0; box-shadow:0 -8px 30px rgba(0,0,0,.18);
  display:flex; flex-direction:column; animation:lgSheetUp .28s cubic-bezier(.32,.72,0,1); text-align:left;
}
@keyframes lgSheetUp{from{transform:translateY(100%)}to{transform:translateY(0)}}
.lg-sheet-handle{width:40px;height:4px;background:rgba(0,0,0,.12);border-radius:2px;margin:10px auto 4px}
.lg-sheet-head{display:flex;align-items:center;justify-content:space-between;padding:6px 18px 12px;border-bottom:1px solid #eee}
.lg-sheet-title{font-size:17px;font-weight:700;color:#222;margin:0;letter-spacing:1px}
.lg-sheet-close{background:none;border:none;color:#999;font-size:20px;cursor:pointer;line-height:1;padding:4px 8px}
.lg-sheet-body{flex:1;overflow-y:auto;padding:14px 18px 22px;-webkit-overflow-scrolling:touch}
.lg-sheet-tip{font-size:13px;color:#555;line-height:1.7;margin:0 0 12px;background:#f7f4ef;border:1px solid #e7e0d6;border-radius:10px;padding:10px 12px}
.lg-sheet-tip strong{color:var(--lg-brand)}
.lg-sheet-img{width:100%;height:auto;display:block;border-radius:10px;border:1px solid #eee}
.lg-sheet-wx{margin:10px 18px 4px;background:#f7f4ef;border:1px solid #e7e0d6;border-radius:10px;padding:10px 12px}
.lg-sheet-wx-text{font-size:12.5px;line-height:1.7;color:#555;margin:0}
.lg-sheet-wx-text strong{color:var(--lg-brand)}
.lg-agree{margin:10px 0 0;text-align:center;font-size:12px;color:var(--lg-t3);line-height:1.6}
.lg-agree-link{
  background:none;border:none;padding:0;margin:0;font:inherit;font-size:12px;
  color:var(--lg-brand);cursor:pointer;text-decoration:underline;text-underline-offset:2px;
  -webkit-tap-highlight-color:transparent;
}
.lg-privacy-body{font-size:13px;line-height:1.75;color:#444}
.lg-privacy-body p{margin:0 0 2px}
.lg-privacy-body .lg-privacy-lead{margin:0 0 6px;color:#555}
.lg-privacy-body .lg-privacy-h{font-size:13.5px;font-weight:700;color:#222;margin:16px 0 6px;letter-spacing:.3px}
.lg-privacy-body strong{color:var(--lg-brand);font-weight:600}
.lg-privacy-body .lg-privacy-mail{color:var(--lg-brand);text-decoration:none;word-break:break-all}
.lg-privacy-body .lg-privacy-updated{margin-top:18px;font-size:12px;color:#999}
@media (max-width:380px){
  .lg-gate{padding:16px}
  .lg-card{padding:20px 18px 6px;border-radius:22px}
  .lg-title{font-size:24px}
  .lg-input{font-size:15px;padding:13px 14px}
  .lg-primary{padding:14px;font-size:15px}
  .lg-help-btn{top:12px;left:12px;padding:4px 8px}
}

.veil{
  position:fixed;inset:0;z-index:70;display:grid;place-items:center;
  background:var(--paper);transition:opacity .3s var(--ease-out);
}
.veil.off{opacity:0;pointer-events:none}
.veil .v-in{text-align:center;color:var(--ink-2);font-size:13px;font-weight:700}
.veil .v-in .logo{width:52px;height:52px;font-size:24px;margin:0 auto 12px;animation:veilPulse 1.4s ease-in-out infinite}
@keyframes veilPulse{0%,100%{transform:rotate(-4deg) scale(1)}50%{transform:rotate(-4deg) scale(1.08)}}

/* ---------- 设置半窗（账号 / 激活 / 音效 / 退出） ---------- */
/* 复用登录页的 .lg-sheet 骨架（overlay/handle/head/body 全现成），这里只补内容样式。
   max-height 保持 vh + dvh 双写：dvh 优先（移动端地址栏伸缩时高度才对），
   老内核不认 dvh 会整条丢弃，靠前一条 vh 兜住——顺序不能反（旧 settings.css 的既有修法）。 */
.st-sheet{max-height:min(85vh,660px);max-height:min(85dvh,660px)}
/* 分隔线极浅，靠间距分组；所有值都带兜底，保证脱离首页作用域也不塌。 */
.st-acct{display:flex;align-items:center;gap:11px;padding:12px;border:1px solid var(--line,#E4DAC6);border-radius:14px;background:var(--paper-2,#F4EDDD)}
.st-av{
  flex:none;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;
  background:var(--red,#D8432C);color:#FFF6EA;font-weight:900;font-size:18px;transform:rotate(-4deg);
}
.st-acct-main{flex:1 1 auto;min-width:0}
.st-acct-name{
  font-size:15px;font-weight:800;color:var(--ink,#26221B);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.st-acct-sub{font-size:11.5px;color:var(--ink-2,#6B6257);margin-top:2px;line-height:1.4}
.st-badge{
  flex:none;font-size:11px;font-weight:800;padding:4px 9px;border-radius:999px;
  background:#EEE7DA;color:var(--ink-2,#6B6257);border:1px solid var(--line,#E4DAC6);
  white-space:nowrap;
}
.st-badge.ok{background:var(--jade-soft,#E2F1E6);color:var(--jade,#1F8A4C);border-color:rgba(31,138,76,.3)}
.st-badge.trial{background:var(--gold-soft,#F0E3C4);color:var(--gold,#B08A3E);border-color:rgba(176,138,62,.35)}
.st-badge.none{background:#FBEDEB;color:var(--red,#D8432C);border-color:rgba(216,67,44,.3)}

.st-rows{margin-top:14px;border-top:1px solid var(--line,#E4DAC6)}
.st-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 2px;border-bottom:1px solid var(--line,#E4DAC6)}
/* 玩法说明入口行（二级目录）：整行可点，右侧箭头示意有下一层 */
.st-link{cursor:pointer;-webkit-tap-highlight-color:transparent}
.st-link:active{background:rgba(176,138,62,.08)}
.st-link .st-arrow{color:var(--ink-2,#8A8070);font-weight:900}
/* 玩法说明弹层内容：一行一景，图标 + 标题 + 短句（迷你节奏，不写长段落）
   ⚠️ 这条 padding 覆盖了半窗基础 .lg-sheet-body 的 18px 左右内边距，
   条目整体贴边（实测图标距边 6px、标题 18px，错位 12px）。14px 是折中：
   比 18 略窄、看着仍算齐，窄屏又不会把「连对越多…」那句挤到换行。 */
.rule-body{padding:6px 14px 18px}
.rule-item{display:flex;gap:12px;align-items:flex-start;padding:11px 2px;border-bottom:1px solid var(--line,#E4DAC6)}
.rule-item:last-child{border-bottom:none}
/* 图标块：emoji 必须真居中。
   ⚠️ 下面那条描述句选择器只能作用于 >div>span —— 若写成 .rule-item span，
   会把本块的 span 一起命中（同为后代选择器、且定义在后），
   display:grid 被覆盖成 block、place-items:center 失效，emoji 贴左上角。 */
.rule-ico{flex:none;width:34px;height:34px;border-radius:10px;background:var(--paper-2,#F4EDDD);
  display:grid;place-items:center;font-size:17px;line-height:1}
.rule-item b{display:block;font-size:14px;font-weight:900;letter-spacing:.02em}
.rule-item>div>span{display:block;font-size:12.5px;color:var(--ink-2,#8A8070);line-height:1.6;margin-top:2px}
.st-k{flex:none;font-size:13px;color:var(--ink-2,#6B6257)}
.st-v{
  font-size:13px;font-weight:700;color:var(--ink,#26221B);
  min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

.st-act{margin-top:14px;padding:13px;border:1px solid rgba(176,138,62,.45);border-radius:14px;background:rgba(176,138,62,.06)}
.st-act-title{font-size:13.5px;font-weight:800;color:var(--gold,#B08A3E);letter-spacing:.02em}
.st-act-sub{font-size:12px;color:var(--ink-2,#6B6257);line-height:1.6;margin-top:4px}
.st-act-form{display:flex;gap:8px;margin-top:10px}
.st-input{
  flex:1 1 auto;min-width:0;font-family:inherit;font-size:14px;letter-spacing:.06em;
  padding:10px 12px;border-radius:10px;border:1px solid var(--line,#E4DAC6);
  background:#fff;color:var(--ink,#26221B);
}
.st-input:focus{outline:none;border-color:var(--gold,#B08A3E)}
.st-input.invalid{border-color:var(--red,#D8432C)}
.st-btn{
  flex:none;font-family:inherit;font-size:13.5px;font-weight:800;cursor:pointer;
  padding:10px 16px;border-radius:10px;border:1px solid var(--gold,#B08A3E);
  background:var(--gold,#B08A3E);color:#FFF9EC;-webkit-tap-highlight-color:transparent;
}
.st-btn:active{transform:scale(.97)}
.st-btn:disabled{opacity:.55;cursor:default}
.st-btn.danger.wide{
  width:100%;margin-top:16px;background:#fff;color:var(--red,#D8432C);
  border-color:rgba(216,67,44,.45);
}
.st-err{font-size:12px;color:var(--red,#D8432C);margin-top:8px;line-height:1.5}
.st-ok{font-size:12px;color:var(--jade,#1F8A4C);margin-top:8px;line-height:1.5}

.st-toggle-row{display:flex;align-items:center;justify-content:space-between;padding:12px 2px;border-bottom:1px solid var(--line,#E4DAC6)}
.st-switch{
  flex:none;width:48px;height:28px;border-radius:999px;border:1px solid var(--line,#E4DAC6);
  background:#EEE7DA;cursor:pointer;position:relative;transition:background .18s ease;
  -webkit-tap-highlight-color:transparent;padding:0;
}
.st-switch i{
  position:absolute;top:2px;left:2px;width:22px;height:22px;border-radius:50%;
  background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.22);transition:transform .18s ease;
}
.st-switch.on{background:var(--jade,#1F8A4C);border-color:var(--jade,#1F8A4C)}
.st-switch.on i{transform:translateX(20px)}
.st-foot{margin-top:16px;text-align:center;font-size:11.5px;color:var(--ink-2,#6B6257);line-height:1.7}


/* ---------- 激活门（强制，未激活/试用到期） ---------- */
/* z-index 必须高于设置半窗（.lg-sheet-overlay=10000）：门挡的是使用权，
   旧版（React）也是门盖住设置面板。 */
.st-gate-overlay{
  position:fixed;inset:0;z-index:10050;display:grid;place-items:center;padding:20px;
  background:rgba(42,37,32,.45);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  animation:stFadeIn .2s ease;
}
.st-gate{
  width:100%;max-width:340px;padding:22px;background:#fff;border-radius:18px;
  box-shadow:0 12px 40px rgba(0,0,0,.18);
  animation:stPopIn .28s cubic-bezier(.32,.72,0,1);
}
@keyframes stPopIn{from{opacity:0;transform:translateY(12px) scale(.97)}to{opacity:1;transform:none}}
.st-gate-icon{
  width:44px;height:44px;margin:0 auto 10px;display:grid;place-items:center;
  border-radius:50%;background:#FDF3E0;font-size:22px;
}
.st-gate-title{font-size:17px;font-weight:700;color:var(--ink,#26221B);text-align:center}
.st-gate-sub{margin-top:6px;font-size:12.5px;line-height:1.65;color:var(--ink-2,#6B6257);text-align:center}
.st-gate-exit{
  display:block;width:100%;margin-top:12px;padding:9px 0;font-family:inherit;
  font-size:12.5px;color:var(--ink-2,#6B6257);background:transparent;border:none;cursor:pointer;
}

.scr{display:none}
.scr.on{display:block;animation:scrIn .35s var(--ease-out)}
@keyframes scrIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

/* toast —— 迷你单行胶囊（2026-09-30）：字小一号、贴边更轻；white-space:nowrap
   强制一行，超宽省略号兜底，绝不出两行大黑条。文案侧也已全部缩短到一屏内。 */
.toast{
  position:fixed;left:50%;bottom:calc(40px + env(safe-area-inset-bottom));
  transform:translateX(-50%) translateY(16px);opacity:0;z-index:60;
  background:rgba(43,38,33,.92);color:#FBF6EC;font-size:12px;font-weight:700;
  padding:7px 14px;border-radius:999px;pointer-events:none;
  transition:all .28s var(--ease-out);
  white-space:nowrap;max-width:92vw;overflow:hidden;text-overflow:ellipsis;text-align:center;
}
.toast.on{transform:translateX(-50%);opacity:1}

/* ============================================================
   2) 演算台（今天第 07 讲 UI）：token 全部 n- 命名空间，与账号外壳隔离
   ============================================================ */
/* 原版的 6 条全局重置（旧壳已有同款 * 重置，不会破坏登录页） */
::selection{background:rgba(233,184,92,.28)}
button{font-family:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg{display:block;max-width:100%}
b{font-weight:700}
html,body{height:100%}
[hidden]{display:none!important}

body.study-mode{
  overflow:hidden; padding-bottom:0; color:var(--n-ink);
  font-family:var(--n-sans); line-height:1.7;
  /* 版 3 · 浅色讲义：米白纸底 + 绿橙晨光，token 全套浅色映射 */
  --n-bg:#FBF6EC; --n-panel:#FFFDF8; --n-panel2:#FFFDF8; --n-panel3:#F6F0E1;
  --n-line:#EDE6D6; --n-line2:#E2D9C4; --n-line3:#D3C8AC;
  --n-ink:#26221B; --n-ink2:#26221B; --n-ink3:#443E33; --n-ink4:#6B6257; --n-ink5:#8A8072; --n-ink6:#A89E8C;
  --n-gold:#B08A3E; --n-gold2:#8F6D2A;
  --n-teal:#0E9488; --n-teal2:#0B6E66;
  --n-violet:#7A63D2; --n-violet2:#5A44B4;
  --n-red:#C24545; --n-green:#1F8A4C; --n-orange:#E0722C;
  background:
    radial-gradient(90% 40% at 15% 0%, rgba(31,138,76,.07), transparent),
    radial-gradient(70% 40% at 90% 8%, rgba(240,150,60,.10), transparent),
    linear-gradient(rgba(176,138,62,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(176,138,62,.05) 1px, transparent 1px),
    var(--n-bg);
  background-size:auto,auto,28px 28px,28px 28px,auto;
}
#scr-study.on{display:block}

:root{
  --n-bg:#0A0E15; --n-panel:#101724; --n-panel2:#121A26; --n-panel3:#0D1420;
  --n-line:#1E2A3E; --n-line2:#223148; --n-line3:#2A3A54;
  --n-ink:#E5EAF2; --n-ink2:#DEE5F0; --n-ink3:#B7C4DA; --n-ink4:#8FA0B8; --n-ink5:#7484A0; --n-ink6:#5C6B80;
  --n-gold:#E9B85C; --n-gold2:#F5DCA6; --n-teal:#57C8BE; --n-teal2:#AEE8E1;
  --n-violet:#9D8CE0; --n-violet2:#C9BDF2; --n-red:#E06C5F; --n-green:#3FBF9A;
  --n-serif:"Songti SC","STSong","Noto Serif SC",serif;
  --n-sans:-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --n-mono:"SF Mono","JetBrains Mono",Menlo,Consolas,monospace;
  --n-ease:cubic-bezier(.22,1,.36,1);
}
/* 主题级联 */
.t-profit{--n-acc:#B8862E;--n-acc2:#96690F;--n-accdim:rgba(184,134,46,.10);--n-accline:rgba(184,134,46,.42)}
.t-rongchi{--n-acc:#0E9488;--n-acc2:#0B6E66;--n-accdim:rgba(14,148,136,.10);--n-accline:rgba(14,148,136,.42)}
.t-bonus{--n-acc:#7A63D2;--n-acc2:#5A44B4;--n-accdim:rgba(122,99,210,.10);--n-accline:rgba(122,99,210,.42)}
/* 第 01 讲 · 和差倍比：琥珀（倍数特性）/ 青碧（方程法）/ 雾紫（赋值法） */
.t-chabei{--n-acc:#C07E1E;--n-acc2:#96620E;--n-accdim:rgba(192,126,30,.10);--n-accline:rgba(192,126,30,.42)}
.t-fangcheng{--n-acc:#0E9488;--n-acc2:#0B6E66;--n-accdim:rgba(14,148,136,.10);--n-accline:rgba(14,148,136,.42)}
.t-fuzhi{--n-acc:#7A63D2;--n-acc2:#5A44B4;--n-accdim:rgba(122,99,210,.10);--n-accline:rgba(122,99,210,.42)}
/* 通用配色（第 03 讲起复用，避免每讲重复加一套） */
.t-blue{--n-acc:#2B5FA8;--n-acc2:#1E4478;--n-accdim:rgba(43,95,168,.10);--n-accline:rgba(43,95,168,.42)}
.t-emerald{--n-acc:#1F8A4C;--n-acc2:#146838;--n-accdim:rgba(31,138,76,.10);--n-accline:rgba(31,138,76,.42)}
.t-rose{--n-acc:#C2455A;--n-acc2:#9C2E42;--n-accdim:rgba(194,69,90,.10);--n-accline:rgba(194,69,90,.42)}
.t-indigo{--n-acc:#5A5AD6;--n-acc2:#4040B4;--n-accdim:rgba(90,90,214,.10);--n-accline:rgba(90,90,214,.42)}
.t-sand{--n-acc:#A6742A;--n-acc2:#7E5516;--n-accdim:rgba(166,116,42,.10);--n-accline:rgba(166,116,42,.42)}
.t-ice{--n-acc:#2E8FA8;--n-acc2:#1F6C82;--n-accdim:rgba(46,143,168,.10);--n-accline:rgba(46,143,168,.42)}

/* ---------- 全屏骨架：页头 / 标签 / 舞台 / 页码栏 ---------- */
.shell{height:100vh;height:100dvh;display:flex;flex-direction:column}
@media(min-width:640px){.shell{max-width:580px;margin:0 auto;border-left:1px solid var(--n-line);border-right:1px solid var(--n-line)}}

.mhead{flex:none;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:calc(7px + env(safe-area-inset-top)) 16px 7px;border-bottom:1px solid var(--n-line);background:transparent}
.eyebrow{font-family:var(--n-mono);font-size:9px;letter-spacing:.24em;color:var(--n-teal)}
.mhead h1{font-family:var(--n-serif);font-size:18px;font-weight:900;color:var(--n-ink);margin-top:2px;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
.mhead h1 i{font-style:normal;color:var(--n-gold);font-size:.68em;vertical-align:.14em;margin:0 .08em;font-family:var(--n-mono);font-weight:400}
/* 版 3：右上角「☰ 目录」胶囊（设置入口移除） */
.tocbtn{flex:none;height:32px;padding:0 12px;border-radius:999px;border:1px solid var(--n-line2);
  background:rgba(255,255,255,.75);color:var(--n-orange);font-size:11.5px;font-weight:700;
  display:flex;align-items:center;gap:5px;font-family:inherit;line-height:1;white-space:nowrap}
.tocbtn:active{background:#F1EADA}

.tabs{flex:none;display:flex;gap:6px;padding:6px 16px;border-bottom:1px solid var(--n-line);background:transparent}
.tabs button{flex:1;padding:7px 6px;border-radius:999px;background:rgba(255,255,255,.6);color:var(--n-ink5);
  font-size:13px;font-weight:700;border:1px solid var(--n-line2);min-height:36px;font-family:inherit}
.tabs button.on{background:var(--n-ink);color:#FAF7F0;border-color:var(--n-ink)}

.stage{flex:1;min-height:0;position:relative;overflow:hidden}
.pager{position:absolute;inset:0;display:none}
.pager.on{display:block}
.ptrack{display:flex;height:100%;will-change:transform;touch-action:pan-y}
.pg{flex:0 0 100%;width:100%;height:100%;overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch;
  padding:12px 16px 18px}
/* ---- 宽屏悬浮翻题按钮（手机 <880px 隐藏，继续用滑动手势） ---- */
.edgebtn{position:absolute;top:50%;transform:translateY(-50%);z-index:30;width:46px;height:46px;
  border-radius:999px;border:1px solid var(--n-line2);background:rgba(255,253,248,.92);
  box-shadow:0 6px 20px rgba(90,74,40,.18);color:var(--n-ink);font-size:19px;font-weight:700;line-height:1;
  display:flex;align-items:center;justify-content:center;cursor:pointer;padding:0;
  opacity:0;pointer-events:none;transition:opacity .4s,transform .25s}
.edgebtn.l{left:12px}
.edgebtn.r{right:12px}
.edgebtn.show{opacity:1;pointer-events:auto}
.edgebtn:active{transform:translateY(-50%) scale(.9)}
.edgebtn::after{content:attr(data-tip);position:absolute;top:calc(100% + 4px);left:50%;transform:translateX(-50%);
  font-size:9px;font-weight:400;color:var(--n-ink5);white-space:nowrap;letter-spacing:.1em}
@media(max-width:879px){.edgebtn{display:none}}
/* ---- 宽屏适配（平板横屏 / PC）：容器加宽，内容限宽居中 ---- */
@media(min-width:880px){
  body.study-mode .shell{max-width:920px}
  .pg{padding:20px 56px 26px}
  .pg > *{max-width:780px;margin-left:auto;margin-right:auto}
}

/* ---------- 底部：圆点页码（可点跳页）+ 页码/进度行 ---------- */
.pnav{flex:none;display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;
  padding:6px 14px calc(6px + env(safe-area-inset-bottom));border-top:1px solid var(--n-line);background:transparent}
.dots{display:flex;align-items:center;justify-content:center;gap:7px;max-width:100%;flex-wrap:wrap}
.dots .dot{width:6px;height:6px;border-radius:999px;background:var(--n-line3);border:0;padding:0;
  transition:width .25s var(--n-ease),background .25s var(--n-ease)}
.dots .dot.on{width:18px;background:var(--n-orange)}
.navinfo{font-family:var(--n-mono);font-size:10px;color:var(--n-ink5);letter-spacing:.08em;line-height:1.5;text-align:center;white-space:nowrap}
.navinfo b{color:var(--n-acc);font-weight:600}

/* ---------- 跳页抽屉 ---------- */
.mask{position:fixed;inset:0;background:rgba(38,34,27,.45);z-index:89;opacity:0;pointer-events:none;transition:opacity .3s}
.mask.show{opacity:1;pointer-events:auto}
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:90;background:var(--n-panel);border-top:1px solid var(--n-line2);
  border-radius:18px 18px 0 0;padding:6px 18px calc(18px + env(safe-area-inset-bottom));max-height:66vh;overflow-y:auto;
  transform:translateY(105%);transition:transform .34s cubic-bezier(.32,.72,.24,1);
  box-shadow:0 -10px 34px rgba(90,74,40,.14)}
.sheet.show{transform:translateY(0)}
@media(min-width:640px){.sheet{max-width:580px;margin:0 auto}}
.grab{width:40px;height:4px;border-radius:99px;background:var(--n-line3);margin:8px auto 12px}
.sheet h5{font-family:var(--n-serif);font-size:14.5px;color:var(--n-ink);margin-bottom:12px}
.sgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;padding-bottom:4px}
.sq{position:relative;border:1px solid var(--n-line2);background:rgba(255,255,255,.7);border-radius:10px;padding:9px 0 7px;
  font-family:var(--n-mono);font-size:11px;color:var(--n-ink4);text-align:center;min-height:40px}
.sq em{display:block;font-style:normal;font-size:8px;color:var(--n-ink6);letter-spacing:.12em;margin-top:1px}
.sq .st{position:absolute;top:5px;right:5px;width:5px;height:5px;border-radius:50%}
.sq .st.ok{background:var(--n-green)}
.sq .st.no{background:var(--n-red)}
.sq.cur{border-color:var(--n-orange);color:var(--n-orange);background:rgba(224,114,44,.08)}
.srow{display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:1px solid var(--n-line2);background:rgba(255,255,255,.7);
  border-radius:11px;padding:11px 12px;margin-bottom:8px;min-height:44px}
.srow .rn{font-family:var(--n-mono);font-size:10px;border:1px solid var(--n-line3);border-radius:6px;padding:2px 7px;letter-spacing:.1em;flex:none;color:var(--n-acc);border-color:var(--n-accline)}
.srow b{font-family:var(--n-serif);font-size:13.5px;color:var(--n-ink2)}
.srow .rsub{margin-left:auto;font-size:10px;color:var(--n-ink6);white-space:nowrap}
.srow.cur{border-color:var(--n-orange);background:rgba(224,114,44,.08)}
/* 刷题目录行：题号 + 题干第一句话（一行省略） */
.srow.qrow b{flex:1;min-width:0;font-family:var(--n-sans);font-weight:500;font-size:12.5px;color:var(--n-ink3);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:left}
.srow.qrow .rn{position:relative}
.srow.qrow .rn .st{position:absolute;top:-3px;right:-3px;width:5px;height:5px;border-radius:50%}
.srow.qrow .rn .st.ok{background:var(--n-green)}
.srow.qrow .rn .st.no{background:var(--n-red)}

/* ---------- 讲义页 ---------- */
.pg-head{display:flex;align-items:center;gap:11px;margin:2px 0 13px}
.pg-head .mno{font-family:var(--n-mono);font-size:10px;color:var(--n-acc);border:1px solid var(--n-accline);border-radius:6px;padding:4px 8px;letter-spacing:.12em;flex:none}
.pg-head .mtt{min-width:0}
.pg-head .mtt b{display:block;font-family:var(--n-serif);font-size:18px;color:var(--n-ink);line-height:1.3}
.pg-head .mtt i{display:block;font-style:normal;font-family:var(--n-mono);font-size:10px;color:var(--n-ink6);letter-spacing:.16em;margin-top:3px}
.lead{font-size:14px;color:var(--n-ink4);line-height:1.85;margin:0 1px 10px;letter-spacing:.01em}
.blocks{display:grid;gap:16px}
.mod-goto{width:100%;margin-top:12px;padding:11px;border-radius:10px;border:0;background:var(--n-accdim);color:var(--n-acc2);font-size:13px;font-weight:700;min-height:42px}

/* ---------- 知识块：去框化（只用细线分隔 + 左侧强调条，尽量把内容铺满） ---------- */
.card{background:none;border:0;border-radius:0;padding:0}
.blk-title{font-family:var(--n-serif);font-size:16px;font-weight:800;color:var(--n-ink);display:flex;align-items:center;gap:7px;margin-bottom:7px;padding-left:9px;border-left:3px solid var(--n-acc);flex-wrap:wrap;line-height:1.4}
.blk-title .bt-tag{font-family:var(--n-mono);font-size:10px;letter-spacing:.16em;color:var(--n-acc);border:0;border-radius:0;padding:0;font-weight:400;opacity:.8}
.concept p{font-size:14px;color:var(--n-ink3);line-height:1.88;letter-spacing:.01em;margin:7px 0}
.concept p b,.concept p strong{color:var(--n-ink2)}
.m{font-family:var(--n-mono);font-size:13.5px;color:var(--n-acc2);background:var(--n-accdim);border:0;padding:1px 7px;border-radius:5px;display:inline-block;vertical-align:bottom;line-height:1.8;margin:1px 0;max-width:100%;white-space:normal;overflow-wrap:anywhere;word-break:break-word}

/* 公式/口诀表：整块一张卡，行间只用极浅虚线分隔（去掉逐条左强调条+实线） */
.formulas{display:grid;grid-template-columns:1fr;gap:0;background:var(--n-panel);
  border:1px solid var(--n-line);border-radius:12px;padding:4px 14px;box-shadow:0 2px 0 var(--n-line)}
.plate{position:relative;border:0;background:none;border-radius:0;padding:9px 2px;overflow:visible;border-bottom:1px dashed var(--n-line2)}
.plate:first-child{padding-top:7px}
.plate:last-child{border-bottom:0;padding-bottom:10px}
.plate::before{content:none}
.plate::after{content:none}
.plate .pn{font-family:var(--n-mono);font-size:10.5px;letter-spacing:.14em;color:var(--n-ink5)}
.plate .pe{font-family:var(--n-mono);font-size:13.5px;color:var(--n-acc2);margin-top:3px;line-height:1.7;overflow-wrap:anywhere}
.plate .pnote{font-size:12px;color:var(--n-ink6);margin-top:3px;line-height:1.65}

.worked .wh{font-size:13.5px;color:var(--n-ink4);background:none;border-radius:0;padding:0;line-height:1.75}
.worked .wh b{color:var(--n-acc2);margin-right:5px}
.wgrid{margin-top:8px;display:grid;gap:0}
.wr{display:flex;justify-content:space-between;align-items:baseline;gap:10px;font-size:13.5px;color:var(--n-ink3);padding:7px 1px;border-bottom:1px dashed var(--n-line2);line-height:1.6}
.wr:last-child{border-bottom:0}
.wr .wm{font-family:var(--n-mono);font-size:13px;color:var(--n-acc2);white-space:nowrap;flex:none}

/* 方法判定：条件 —— 方法 平铺对照（原文口径，无切换框） */
.cmap{margin-top:8px}
.cmap-row{padding:9px 2px 9px 12px;border-left:2px solid var(--n-accline);border-bottom:1px dashed var(--n-line2)}
.cmap-row:last-child{border-bottom:0}
.cmap-if{font-size:14px;color:var(--n-ink2);font-weight:700;line-height:1.6}
.cmap-if .qs-k{font-family:var(--n-mono);font-size:10px;letter-spacing:.18em;color:var(--n-acc2);margin-right:7px}
.cmap-then{font-size:14px;color:var(--n-ink2);margin-top:4px;line-height:1.65}
.cmap-then i{font-style:normal;color:var(--n-acc2);font-weight:800;margin-right:6px}
.cmap-row p{font-size:13px;color:var(--n-ink4);margin-top:3px;line-height:1.75}
.cmap-row p b{color:var(--n-ink2)}

.steps{display:grid;gap:0;margin-top:6px}
.step{position:relative;padding:9px 0 9px 34px;border:0;border-bottom:1px solid var(--n-line2);border-radius:0;background:none}
.step:last-child{border-bottom:0}
.step::before{content:attr(data-n);position:absolute;left:0;top:10px;font-family:var(--n-mono);font-size:10px;color:var(--n-acc);letter-spacing:.1em}
.step > b{display:block;font-size:12.5px;color:var(--n-ink2);line-height:1.5}
.step > span{display:block;font-size:12px;color:var(--n-ink4);margin-top:3px;line-height:1.78}

.compare{display:grid;gap:0}
.cmp{border:0;border-bottom:1px solid var(--n-line2);border-radius:0;padding:9px 0;background:none}
.cmp:last-child{border-bottom:0;padding-bottom:2px}
.cmp h6{font-size:13px;color:var(--n-acc2);display:flex;justify-content:space-between;align-items:center;gap:8px;font-weight:700}
.cmp h6 em{font-style:normal;font-family:var(--n-mono);font-size:9px;color:var(--n-ink5);border:0;border-radius:0;padding:0;letter-spacing:.16em;font-weight:400}
.cformula{font-family:var(--n-mono);font-size:12px;color:var(--n-acc2);background:var(--n-accdim);border-radius:7px;padding:6px 9px;margin:6px 0;line-height:1.7;overflow-wrap:anywhere}
.cmp p{font-size:12px;color:var(--n-ink4);line-height:1.7;margin:4px 0}
.cmp b{color:var(--n-ink2)}

.svgwrap{border:1px solid var(--n-line);border-radius:9px;background:var(--n-panel3);padding:6px 0 2px;overflow-x:auto;-webkit-overflow-scrolling:touch}
.svgwrap svg{min-width:600px;width:600px;margin:0 auto}
.figcap{font-size:12px;color:var(--n-ink5);line-height:1.7;margin:8px 12px 6px;text-align:center}
.figcap b{color:var(--n-ink3)}
.boardbtn{display:flex;justify-content:center;align-items:center;width:100%;padding:11px;border-radius:10px;border:1px solid var(--n-accline);background:var(--n-accdim);color:var(--n-acc2);font-size:13px;font-weight:700;min-height:42px}
.boardbtn:active{filter:brightness(1.25)}

.paraslider{width:calc(100% - 20px);margin:10px 10px 0;accent-color:var(--n-gold);height:40px}
.readout{display:flex;gap:6px;flex-wrap:wrap;margin:2px 10px 8px}
.readout .ro{flex:1;min-width:72px;background:var(--n-panel3);border:1px solid var(--n-line2);border-radius:8px;padding:6px 7px;font-size:10px;color:var(--n-ink5);text-align:center}
.readout .ro b{display:block;font-family:var(--n-mono);font-size:12.5px;color:var(--n-gold);margin-top:2px;font-weight:600}

/* ---------- 题目页（一题一页） ---------- */
.qpg .q{margin:0}
.q{background:var(--n-panel);border:1px solid var(--n-line);border-radius:14px;padding:13px 14px 14px;box-shadow:0 2px 0 var(--n-line)}
.q-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.q-no{font-family:var(--n-mono);font-size:12px;color:var(--n-acc);letter-spacing:.12em}
.q-title{font-family:var(--n-serif);font-size:15px;color:var(--n-ink);font-weight:800}
.q-src{font-size:9.5px;color:var(--n-ink6);border:1px solid var(--n-line2);border-radius:999px;padding:2px 8px;white-space:nowrap}
.q-m{margin-left:auto;font-family:var(--n-mono);font-size:9.5px;color:var(--n-acc2);background:var(--n-accdim);border:1px solid var(--n-accline);border-radius:999px;padding:2px 9px;white-space:nowrap}
.q-stem{font-size:16px;line-height:1.8;color:var(--n-ink2);margin-top:9px}
.q-stem b{color:var(--n-gold);font-weight:700}
.q-fig{width:100%;border-radius:10px;border:1px solid var(--n-line2);margin-top:11px}
.opts{display:grid;gap:8px;margin-top:11px}
.opt{display:flex;align-items:flex-start;gap:11px;width:100%;padding:12px 13px;border-radius:10px;border:1px solid var(--n-line2);background:rgba(255,255,255,.7);font-size:15.5px;color:var(--n-ink3);text-align:left;line-height:1.6;min-height:48px}
.opt .ol{flex:0 0 27px;height:27px;border-radius:8px;background:var(--n-accdim);color:var(--n-acc);display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:700;font-family:var(--n-mono);margin-top:1px}
.opt.right{border-color:var(--n-green);background:rgba(31,138,76,.10);color:#146838}
.opt.right .ol{background:rgba(31,138,76,.18);color:#146838}
.opt.wrong{border-color:var(--n-red);background:rgba(194,69,69,.08);color:#9C2E2E}
.opt.wrong .ol{background:rgba(194,69,69,.16);color:#9C2E2E}
.q.answered .opt:not(.right):not(.pick){opacity:.45}
.q-act{display:flex;align-items:center;gap:8px;margin-top:13px;flex-wrap:wrap}
.q-verdict{font-size:12.5px;color:var(--n-ink5);flex:1;min-width:130px;line-height:1.6}
.q-verdict.v-ok{color:#146838}
.q-verdict.v-no{color:#9C2E2E}
.q-redo,.q-exp-btn{padding:10px 14px;border-radius:9px;font-size:13px;font-weight:700;min-height:40px}
.q-redo{border:1px solid var(--n-line3);background:var(--n-panel3);color:var(--n-ink4)}
.q-exp-btn{border:1px solid var(--n-accline);background:var(--n-accdim);color:var(--n-acc2)}
.q-exp{display:grid;grid-template-rows:0fr;transition:grid-template-rows .45s var(--n-ease),margin .45s var(--n-ease)}
.q-exp>div{overflow:hidden}
.q.exp-open .q-exp{grid-template-rows:1fr;margin-top:13px}
.q.demo .q-exp{grid-template-rows:1fr;margin-top:13px}
.judge{font-size:12px;color:var(--n-acc2);background:var(--n-accdim);border-left:3px solid var(--n-acc);border-radius:8px;padding:9px 11px;line-height:1.75}
.jsteps{margin-top:11px;display:grid;gap:11px}
.jstep{display:flex;gap:10px}
.jstep .jn{flex:0 0 23px;height:23px;border-radius:50%;border:1px solid var(--n-accline);color:var(--n-acc);font-family:var(--n-mono);font-size:11.5px;display:flex;align-items:center;justify-content:center;margin-top:2px}
.jstep h5{font-size:14.5px;color:var(--n-ink);font-weight:700;line-height:1.5}
.jstep p{font-size:13.5px;color:var(--n-ink4);margin-top:3px;line-height:1.8}
.jstep b{color:var(--n-ink2)}
.math{font-family:var(--n-mono);font-size:13px;color:var(--n-gold);background:var(--n-panel3);border:0;border-left:2px solid rgba(176,138,62,.45);border-radius:6px;padding:7px 9px;margin-top:6px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word}
.concl{margin-top:11px;font-size:14px;font-weight:700;color:#146838;background:rgba(31,138,76,.10);border:1px solid rgba(31,138,76,.35);border-radius:10px;padding:10px 12px;line-height:1.7}
.adv{margin-top:11px;border:1px dashed var(--n-line3);border-radius:10px;padding:1px 12px}
.adv summary{font-size:12.5px;color:var(--n-violet2);font-weight:700;padding:10px 0;list-style:none;min-height:40px;display:flex;align-items:center;line-height:1.5}
.adv summary::-webkit-details-marker{display:none}
.adv summary::before{content:"◆";font-size:9px;margin-right:7px;opacity:.7}
.adv-body p{font-size:13.5px;color:var(--n-ink4);line-height:1.8;margin:0 0 9px}
.adv-body b{color:var(--n-ink2)}
.note{margin-top:11px;font-size:12px;color:var(--n-violet2);background:rgba(157,140,224,.10);border:1px dashed rgba(157,140,224,.4);border-radius:10px;padding:9px 11px;line-height:1.75}
.note b{color:var(--n-violet2)}

/* ---------- 数据页 ---------- */
.pg-about .fp{font-size:13.5px;color:var(--n-ink5);line-height:1.8;margin:0 0 16px}
.pipe{display:grid;gap:9px}
.pstage{background:var(--n-panel3);border:1px solid var(--n-line2);border-radius:11px;padding:11px 13px}
.pstage .pn{font-family:var(--n-mono);font-size:9.5px;color:var(--n-teal);letter-spacing:.18em}
.pstage h6{font-size:13px;color:var(--n-ink);margin-top:4px;font-weight:700}
.pstage p{font-size:12px;color:var(--n-ink4);line-height:1.75;margin-top:4px}
.pg-about a{color:var(--n-gold2);text-decoration:none;border-bottom:1px dotted rgba(233,184,92,.45)}
.errs{margin-top:16px}
.errs h4{font-size:14px;color:var(--n-ink);font-weight:800;display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.errs h4 span{font-size:10.5px;color:var(--n-ink6);font-weight:400;letter-spacing:.08em}
.jsonbox{margin-top:16px}
.jbtn{width:100%;padding:13px;border-radius:11px;border:1px dashed var(--n-line3);background:var(--n-panel3);color:var(--n-violet2);font-size:13px;font-weight:700;min-height:44px}
#jsonPre{display:none;margin-top:10px;max-height:38vh;overflow:auto;background:var(--n-panel3);border:1px solid var(--n-line2);border-radius:11px;padding:12px;font-family:var(--n-mono);font-size:10px;color:var(--n-ink3);line-height:1.65;white-space:pre;-webkit-overflow-scrolling:touch}
#jsonPre.show{display:block}
.fin{margin-top:18px;display:grid;gap:5px;text-align:center}
.fin span{font-size:10.5px;color:var(--n-ink6);letter-spacing:.06em}

/* ---------- 板书灯箱 ---------- */
.lb{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;background:rgba(6,9,14,.92);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);padding:22px;cursor:zoom-out}
.lb.show{display:flex}
.lb figure{max-width:100%;display:flex;flex-direction:column;gap:10px}
.lb img{max-width:100%;max-height:76vh;border-radius:12px;border:1px solid var(--n-line3);box-shadow:0 30px 80px rgba(0,0,0,.65)}
.lb figcaption{text-align:center;font-size:12px;color:#D8D2C4;line-height:1.65}


/* 页头齿轮（账号与设置入口） */
.gear{
  flex:none;width:34px;height:34px;border-radius:10px;border:1px solid var(--n-line2);
  background:var(--n-panel2);color:var(--n-ink4);font-size:15px;line-height:1;
  display:flex;align-items:center;justify-content:center;padding:0;
}
.gear:active{background:rgba(0,0,0,.06)}
/* 手机版 mhead 骨架里补一下三列对齐 */
.mhead{align-items:center}

/* ---------- 演算台返回课程目录按钮 ---------- */
.backbtn{
  flex:none;width:34px;height:34px;border-radius:999px;border:1px solid var(--n-line2);
  background:rgba(255,255,255,.75);color:var(--n-ink4);font-size:19px;font-weight:700;line-height:1;
  display:flex;align-items:center;justify-content:center;padding:0;
}
.backbtn:active{background:#F1EADA}

/* ---------- 首页入口（版 C · 清晨手账，登录后首屏） ---------- */
#scr-home.on{display:block}
#scr-home .hm-wrap{
  max-width:620px;margin:0 auto;min-height:100dvh;display:flex;flex-direction:column;
  padding:0 20px calc(26px + env(safe-area-inset-bottom));
  background:
    radial-gradient(90% 40% at 15% 0%, rgba(31,138,76,.07), transparent),
    radial-gradient(70% 40% at 90% 8%, rgba(240,150,60,.10), transparent);
}
#scr-home .hm-head{display:flex;justify-content:flex-end;padding-top:16px}
#scr-home .hm-body{flex:1;display:flex;flex-direction:column;padding-top:6px}
#scr-home .hm-pill{
  align-self:flex-start;display:inline-flex;align-items:center;gap:7px;padding:7px 13px;border-radius:999px;
  background:var(--jade-soft);color:var(--jade);font-size:11.5px;font-weight:800;letter-spacing:.16em;
}
#scr-home .hm-pill i{font-style:normal;font-size:8px}
#scr-home .hm-body h2{
  font-size:33px;font-weight:900;line-height:1.32;letter-spacing:1px;color:var(--ink);
  margin:18px 0 0;
}
#scr-home .hm-body h2 em{font-style:normal;position:relative;color:var(--jade)}
#scr-home .hm-body h2 em::after{
  content:"";position:absolute;left:-2px;right:-2px;bottom:2px;height:9px;border-radius:5px;
  background:rgba(31,138,76,.16);z-index:-1;
}
#scr-home .hm-sub{font-size:13px;color:var(--ink-2);line-height:1.85;margin-top:11px}
#scr-home .hm-bento{display:grid;grid-template-columns:1.35fr 1fr;gap:10px;margin:22px 0}
#scr-home .hm-b1,#scr-home .hm-b2{border-radius:18px;padding:15px 14px;position:relative;overflow:hidden}
#scr-home .hm-b1{background:var(--jade);color:#EAFBF0}
#scr-home .hm-b2{background:#FFF3E2;color:#9A5A1B;border:1px solid #F5E3C8}
#scr-home .hm-b1 small,#scr-home .hm-b2 small{display:block;font-size:10px;letter-spacing:.28em;opacity:.72;font-weight:700}
#scr-home .hm-b1 b,#scr-home .hm-b2 b{display:block;font-size:30px;font-weight:900;margin-top:6px;line-height:1;font-variant-numeric:tabular-nums}
#scr-home .hm-b1 b i{font-style:normal;font-size:15px;font-weight:700;opacity:.8;margin-left:2px}
#scr-home .hm-b1::after,#scr-home .hm-b2::after{
  position:absolute;right:-14px;bottom:-18px;font-size:64px;opacity:.14;font-weight:900;line-height:1;
}
#scr-home .hm-b1::after{content:"讲"}
#scr-home .hm-b2::after{content:"题"}
/* ---- 秒杀题库入口：奶油纸 × 朱砂金棕（与秒杀页同族，浅色） ---- */
#scr-home .hm-kill{
  position:relative;overflow:hidden;display:flex;align-items:center;gap:13px;width:100%;
  margin:-6px 0 14px;padding:14px 15px;border-radius:18px;cursor:pointer;font-family:inherit;
  border:1px solid #EADFC8;text-align:left;
  background:linear-gradient(120deg,#FFFCF4 0%,#FFF8EC 55%,#FDF3E3 100%);
  box-shadow:0 2px 0 #EADFC8, 0 10px 28px rgba(176,138,62,.14);
  transition:transform .15s;
}
#scr-home .hm-kill:active{transform:scale(.97)}
#scr-home .hm-kill::before{ /* 暖金流光 */
  content:"";position:absolute;top:0;bottom:0;width:46%;left:-60%;pointer-events:none;
  background:linear-gradient(100deg,transparent,rgba(176,138,62,.10),rgba(216,67,44,.08),transparent);
  animation:hkSheen 3.4s ease-in-out infinite;
}
@keyframes hkSheen{0%{left:-60%}55%,100%{left:130%}}
#scr-home .hm-kill::after{ /* 朱砂角标 */
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(60% 90% at 88% 10%, rgba(216,67,44,.07), transparent 60%);
}
#scr-home .hk-bolt{
  flex:none;width:42px;height:42px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  font-size:21px;line-height:1;background:linear-gradient(140deg,#D8563E,#B02E26);
  border:1px solid #EBC0B4;box-shadow:0 3px 10px rgba(216,67,44,.22);
}
#scr-home .hk-bolt svg{display:block}
#scr-home .hk-tt{flex:1;min-width:0}
#scr-home .hk-tt b{
  display:block;font-size:15px;font-weight:900;letter-spacing:1px;color:#8A3A2A;
}
#scr-home .hk-tt i{display:block;font-style:normal;margin-top:3px;font-size:10.5px;color:var(--ink-2);letter-spacing:.04em}
#scr-home .hk-go{
  flex:none;font-size:11px;font-weight:900;letter-spacing:.18em;color:#FFF8EF;
  background:linear-gradient(120deg,#D8563E,#B02E26);border-radius:999px;padding:7px 13px;
  box-shadow:0 3px 10px rgba(216,67,44,.25);
}
/* ---- 林凡课程入口：晨绿纸卡（进入本课程目录 scr-courses） ---- */
#scr-home .hm-lf{
  position:relative;overflow:hidden;display:flex;align-items:center;gap:13px;width:100%;
  margin:0 0 14px;padding:14px 15px;border-radius:18px;cursor:pointer;font-family:inherit;
  border:1px solid #CFE6D6;text-align:left;background:#FBFEF9;
  box-shadow:0 2px 0 #CFE6D6, 0 10px 28px rgba(31,138,76,.10);
  transition:transform .15s;
}
#scr-home .hm-lf:active{transform:scale(.97)}
#scr-home .hm-lf::before{ /* 淡绿流光 */
  content:"";position:absolute;top:0;bottom:0;width:46%;left:-60%;pointer-events:none;
  background:linear-gradient(100deg,transparent,rgba(31,138,76,.08),rgba(176,138,62,.08),transparent);
  animation:hlSheen 3.8s ease-in-out infinite;
}
@keyframes hlSheen{0%{left:-60%}55%,100%{left:130%}}
#scr-home .lf-badge{
  flex:none;width:42px;height:42px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,#2E9159,#1F8A4C);border:1px solid #BFE3CD;
  box-shadow:0 3px 10px rgba(31,138,76,.25);
  font-family:"Songti SC","STSong","Noto Serif SC",serif;font-size:22px;font-weight:800;color:#EAFBF0;line-height:1;
}
#scr-home .hl-tt{flex:1;min-width:0}
#scr-home .hl-tt b{
  display:block;font-size:15px;font-weight:900;letter-spacing:1px;color:#1F7A45;
}
#scr-home .hl-tt i{display:block;font-style:normal;margin-top:3px;font-size:10.5px;color:var(--ink-2);letter-spacing:.04em}
#scr-home .hl-go{
  flex:none;font-size:11px;font-weight:900;letter-spacing:.18em;color:#FFFDF8;
  background:linear-gradient(120deg,#2E9159,#1F8A4C);border-radius:999px;padding:7px 13px;
  box-shadow:0 3px 10px rgba(31,138,76,.28);
}
/* ---- P神课程入口：奶油纸 × 靛蓝卡（独立课程，零耦合，跳转独立目录） ---- */
#scr-home .hm-fc{
  position:relative;overflow:hidden;display:flex;align-items:center;gap:13px;width:100%;
  margin:0 0 22px;padding:14px 15px;border-radius:18px;cursor:pointer;font-family:inherit;
  border:1px solid var(--line);text-align:left;background:#FFFDF8;
  box-shadow:0 2px 0 var(--line), 0 10px 28px rgba(90,74,40,.10);
  transition:transform .15s;
}
#scr-home .hm-fc:active{transform:scale(.97)}
#scr-home .hm-fc::before{ /* 淡金流光 */
  content:"";position:absolute;top:0;bottom:0;width:46%;left:-60%;pointer-events:none;
  background:linear-gradient(100deg,transparent,rgba(43,76,126,.06),rgba(176,138,62,.10),transparent);
  animation:hfSheen 3.8s ease-in-out infinite;
}
@keyframes hfSheen{0%{left:-60%}55%,100%{left:130%}}
#scr-home .hf-chalk{
  flex:none;width:42px;height:42px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,#2B4C7E,#1E3A63);border:1px solid #C5D6F0;
  box-shadow:0 3px 10px rgba(43,76,126,.25);
  font-family:"Songti SC","STSong","Noto Serif SC",serif;font-size:22px;font-weight:800;color:#F5EAD2;line-height:1;
}
#scr-home .hf-tt{flex:1;min-width:0}
#scr-home .hf-tt b{
  display:block;font-size:15px;font-weight:900;letter-spacing:1px;color:#2B4C7E;
}
#scr-home .hf-tt i{display:block;font-style:normal;margin-top:3px;font-size:10.5px;color:var(--ink-2);letter-spacing:.04em}
#scr-home .hf-go{
  flex:none;font-size:11px;font-weight:900;letter-spacing:.18em;color:#FFFDF8;
  background:linear-gradient(120deg,#2B4C7E,#1E3A63);border-radius:999px;padding:7px 13px;
  box-shadow:0 3px 10px rgba(43,76,126,.28);
}
#scr-home .hm-chips{display:flex;gap:8px;margin-bottom:22px;flex-wrap:wrap}
#scr-home .hm-chip{
  padding:8px 13px;border-radius:999px;font-size:11.5px;font-weight:700;letter-spacing:.04em;
  border:1px solid #E5DECC;background:rgba(255,255,255,.7);color:var(--ink-2);
  font-family:inherit;cursor:pointer;transition:transform .15s;
}
#scr-home .hm-chip:active{transform:scale(.94)}
#scr-home .hm-chip.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}
#scr-home .hm-foot{margin-top:13px;text-align:center;font-size:10.5px;color:#B3AE9F;letter-spacing:.28em}

/* ---------- 课程目录屏（登录后默认屏幕） ---------- */
#scr-courses.on{display:block}
/* ---- 课程目录：版 C 浅色手账风（与首页同源）+ 顶部返回图标 ---- */
#scr-courses .shell{
  background:
    radial-gradient(90% 40% at 15% 0%, rgba(31,138,76,.07), transparent),
    radial-gradient(70% 40% at 90% 8%, rgba(240,150,60,.10), transparent);
}
#scr-courses .mhead{background:transparent}
#scr-courses .mhead .eyebrow{color:var(--jade)}
#scr-courses .mhead h1{color:var(--ink)}
#scr-courses .cl-nav{display:flex;align-items:center;gap:10px;min-width:0}
#scr-courses .cl-back{
  flex:none;width:34px;height:34px;border-radius:999px;border:1px solid #E5DECC;
  background:rgba(255,255,255,.75);color:var(--ink);font-size:16px;line-height:1;
  display:flex;align-items:center;justify-content:center;padding:0;cursor:pointer;
  transition:transform .15s;
}
#scr-courses .cl-back:active{transform:scale(.92)}
#scr-courses .cl-lead{color:var(--ink-2)}
#scr-courses .cl-card{
  border:1px solid #EDE6D6;background:#FFFDF8;border-radius:16px;
  box-shadow:0 2px 0 #EDE6D6;
}
#scr-courses .cl-card .cl-no{color:var(--jade);border-color:rgba(31,138,76,.35);background:var(--jade-soft)}
#scr-courses .cl-card .cl-tt b{color:var(--ink)}
/* 标题内嵌分隔符 <i>×</i>：避免命中下方 .cl-tt i 的 display:block 被拆成独立一行 */
#scr-courses .cl-card .cl-tt b i{display:inline;margin:0;font-family:inherit;font-size:.9em;
  font-style:normal;letter-spacing:0;color:var(--gold)}
#scr-courses .cl-card .cl-tt i{color:var(--ink-2)}
#scr-courses .cl-card .cl-st{color:#E0722C;font-weight:700}
#scr-courses .cl-card.ready{
  border-color:rgba(31,138,76,.30);
  background:linear-gradient(135deg,rgba(31,138,76,.05),#FFFDF8 58%);
}
#scr-courses .cl-card.ready:active{background:#F4F0E4}
#scr-courses .cl-card.locked{opacity:.5}
#scr-courses .cl-stage{flex:1;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:14px 16px 26px}
.cl-lead{font-size:12px;color:var(--n-ink5);line-height:1.8;margin:0 1px 13px}
.cl-list{display:grid;gap:12px}
/* ---- 版 2：顶部统计条 + 知识点 chips ---- */
.cl-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:0 1px 14px}
.cl-stat{background:#FFFDF8;border:1px solid #EDE6D6;border-radius:12px;padding:10px 12px;box-shadow:0 2px 0 #EDE6D6}
.cl-stat b{display:block;font-family:var(--n-mono);font-size:17px;color:var(--jade);line-height:1.2}
.cl-stat span{display:block;font-size:9px;color:#A89E8C;letter-spacing:.12em;margin-top:3px;white-space:nowrap}
@media(max-width:430px){.cl-stats{grid-template-columns:repeat(2,1fr)}}
.cl-chips{display:flex;gap:5px;flex-wrap:wrap;margin-top:7px}
.cl-chips em{font-style:normal;font-size:10px;color:var(--gold);background:rgba(176,138,62,.10);
  border:1px solid rgba(176,138,62,.25);border-radius:999px;padding:2px 9px;white-space:nowrap}
.cl-card{position:relative;display:flex;align-items:center;gap:12px;text-align:left;
  border:1px solid var(--n-line2);background:var(--n-panel2);border-radius:13px;padding:12px 14px;min-height:66px}
.cl-card .cl-no{flex:none;font-family:var(--n-mono);font-size:10px;letter-spacing:.12em;color:var(--n-ink5);
  border:1px solid var(--n-line3);border-radius:9px;padding:9px 8px;line-height:1.1}
.cl-card .cl-tt{min-width:0;flex:1}
.cl-card .cl-tt b{display:block;font-family:var(--n-serif);font-size:15.5px;color:#E8EDF5;line-height:1.35;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cl-card .cl-tt i{display:block;font-style:normal;font-size:10.5px;color:var(--n-ink6);margin-top:3px;
  font-family:var(--n-mono);letter-spacing:.04em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cl-card .cl-st{flex:none;font-size:10px;font-family:var(--n-mono);letter-spacing:.08em;color:var(--n-ink6)}
.cl-card.ready{border-color:rgba(233,184,92,.30);background:linear-gradient(135deg,rgba(233,184,92,.08),var(--n-panel2) 58%)}
.cl-card.ready .cl-no{color:var(--n-gold);border-color:rgba(233,184,92,.4)}
.cl-card.ready .cl-tt b{color:var(--n-gold2)}
.cl-card.ready .cl-st{color:var(--n-gold)}
.cl-card.locked{opacity:.55}
/* ---- 课程目录屏：去掉页头下边框与内容列左右边框（平板/PC 上的两条框线） ---- */
#scr-courses .shell{border-left:0;border-right:0}
#scr-courses .mhead{border-bottom:0}
/* ---- 版 2 宽屏适配：平板 / PC 加宽，宽行卡信息全铺开（手机端保持单列） ---- */
@media(min-width:880px){
  #scr-courses .shell{max-width:920px}
  #scr-courses .cl-stage{padding:22px 32px 40px}
  #scr-courses .cl-lead{font-size:13px;max-width:780px}
  #scr-courses .cl-stats{gap:12px;margin-bottom:20px}
  #scr-courses .cl-stat{padding:14px 18px}
  #scr-courses .cl-stat b{font-size:21px}
  #scr-courses .cl-stat span{font-size:10px}
  .cl-list{gap:14px}
  .cl-card{padding:18px 22px;min-height:78px}
  .cl-card .cl-tt b{font-size:17px}
  .cl-chips em{font-size:11px;padding:3px 11px}
}