/* ================= 精品层（2026-10-06）：排印、导航、质感、交互 =================
   原则：内容与 Mars 偏好清单 72 条一字不动；只升级「工艺层」。
   JS 跑不起来时（html 没有 js-anim）页面原样可读。 */
:root{--mono:"IBM Plex Mono","Noto Serif SC","Songti SC",monospace;--ease:cubic-bezier(.22,1,.36,1);--ease-io:cubic-bezier(.65,0,.35,1);--red-2:#e0573f;--navh:58px}

/* ---- 排印：标点挤压、断行、选区、焦点 ---- */
h1.head,.sechead h2,.cword b,.bigmark{font-feature-settings:"palt" 1;text-spacing-trim:trim-start}
/* 主标题：一行放下，字号让给舞台照和公式（10-07 Mars：太喧宾夺主） */
h1.head{font-size:min(60px,calc((100vw - 36px) / 12.8));letter-spacing:0;line-height:1.15;white-space:nowrap}
h1.head .nb{display:inline}
.letter p,.pt p,.sylbody li,.cmeta div,.steps p,.quotes p,.contact p,.promise{text-wrap:pretty}
.course h3,.leadline,.moretalk .t{text-wrap:balance}
.hook{text-wrap:wrap}
::selection{background:var(--red);color:#fff}
:focus-visible{outline:2px solid var(--red);outline-offset:3px}
.skip{position:fixed;left:16px;top:-80px;z-index:400;background:var(--ink);color:var(--paper);padding:10px 16px;font-weight:700;transition:top .3s var(--ease)}
.skip:focus{top:16px}
[id]{scroll-margin-top:calc(var(--navh) + 18px)}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
.lenis.lenis-stopped{overflow:hidden}

/* ---- 纸纹：极淡颗粒，静态，不抢内容 ---- */
body::before{content:"";position:fixed;inset:0;z-index:250;pointer-events:none;opacity:.32;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .45  0 0 0 0 .4  0 0 0 0 .33  0 0 0 .11 0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E")}

/* ---- 顶部导航：过了首屏才出现；往下读时收起，往上翻时出现 ---- */
.topnav{position:fixed;left:0;right:0;top:0;z-index:200;height:var(--navh);background:rgba(250,249,246,.9);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--ink);transform:translateY(-101%);transition:transform .55s var(--ease)}
.topnav.show{transform:none}
.tn-in{max-width:1180px;margin:0 auto;padding:0 30px;height:100%;display:flex;align-items:center;gap:28px}
.tn-brand{font-weight:900;font-size:17px;letter-spacing:.02em;white-space:nowrap;display:flex;align-items:center}
.tn-brand .dot{color:var(--red)}
.tn-list{list-style:none;display:flex;gap:4px;margin-left:auto}
.tn-list a{position:relative;display:block;padding:6px 11px;font-size:15px;font-weight:700;color:var(--ink-2);transition:color .25s}
.tn-list a::before{content:"";position:absolute;left:11px;right:11px;bottom:1px;height:2px;background:var(--red);transform:scaleX(0);transform-origin:0 50%;transition:transform .45s var(--ease)}
.tn-list a:hover{color:var(--ink)}
.tn-list a:hover::before{transform:scaleX(1)}
.tn-list a.on{color:var(--red)}
.tn-list a.on::before{transform:scaleX(1)}
.tn-now{display:none}
.tn-cta{position:relative;overflow:hidden;display:inline-flex;align-items:center;gap:8px;background:var(--ink);color:var(--paper);font-weight:900;font-size:15px;padding:8px 18px;white-space:nowrap;isolation:isolate}
.tn-cta::before{content:"";position:absolute;inset:0;background:var(--red);transform:translateY(101%);transition:transform .45s var(--ease);z-index:-1}
.tn-cta:hover::before{transform:none}
.tn-cta span{transition:transform .45s var(--ease)}
.tn-cta:hover span{transform:translateX(3px)}
.tn-prog{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--red);transform:scaleX(var(--p,0));transform-origin:0 50%}

/* ---- 书口：宽屏右缘竖排当前章节 + 本章阅读进度（线装书的书口） ---- */
.rail{position:fixed;right:26px;top:50%;z-index:150;display:none;flex-direction:column;align-items:center;gap:14px;transform:translateY(-50%);opacity:0;transition:opacity .5s var(--ease);pointer-events:none}
.rail.show{opacity:1}
.rail.show.mute{opacity:0}
.rail-name{writing-mode:vertical-rl;font-weight:900;font-size:14px;letter-spacing:.42em;color:var(--ink);min-height:4.5em;transition:opacity .3s}
.rail-line{position:relative;display:block;width:2px;height:120px;background:var(--hair)}
.rail-line b{position:absolute;left:0;top:0;width:100%;height:100%;background:var(--red);transform:scaleY(var(--rp,0));transform-origin:50% 0}
@media (min-width:1360px){.rail{display:flex}}

/* ---- 按钮：色块从下/从左涨起来，箭头前移 ---- */
.bigbtn{position:relative;overflow:hidden;isolation:isolate;transition:none}
.bigbtn::before{content:"";position:absolute;inset:0;background:var(--red);transform:translateY(101%);transition:transform .55s var(--ease);z-index:-1}
.bigbtn:hover{background:#f5e4df}
.bigbtn:hover::before{transform:none}
.bigbtn b,.bigbtn span,.bigbtn i{transition:color .35s var(--ease),transform .55s var(--ease)}
.bigbtn i{display:inline-block}
.bigbtn:hover i{transform:translateX(6px)}
.bigbtn .ic-btn *{transition:stroke .35s}
.ctabtn{position:relative;overflow:hidden;isolation:isolate;transition:color .35s var(--ease),border-color .35s}
.ctabtn::before{content:"";position:absolute;inset:0;background:var(--ink);transform:scaleX(0);transform-origin:0 50%;transition:transform .5s var(--ease);z-index:-1}
.ctabtn.red::before{background:var(--red)}
.ctabtn:hover{background:transparent}
.ctabtn:hover::before{transform:none}
.sylbtn{transition:background-size .45s var(--ease),color .3s}

/* ---- 首屏：舞台照留出视差余量；人像只做遮罩揭开，不缩放（偏好 64） ---- */
.heroshot{overflow:hidden;position:relative}
.heroshot img{will-change:transform}
.portrait .ph{background:var(--paper-2)}

/* ---- 段头：粗线画出来、朱砂块长出来、标题逐字升起 ---- */
.sechead{position:relative;border-top:0}
.sechead::before{content:"";position:absolute;left:0;right:0;top:0;height:7px;background:var(--ink);transform-origin:0 50%}
.course{position:relative;border-top:0}
.course::before{content:"";position:absolute;left:0;right:0;top:0;height:7px;background:var(--ink);transform-origin:0 50%}
.ch{display:inline-block;overflow:hidden;vertical-align:top;padding:.14em 0 .1em;margin:-.14em 0 -.1em}
.ch>.ci{display:inline-block;font-style:normal;will-change:transform}

/* ---- 经历：本身已有生长动画，这里只补手感 ---- */
.tl .n{transition:background .3s}
.tl .n:hover .e{color:var(--ink)}

/* ---- 合作方 logo：悬停轻抬 ---- */
.logowall .cell img{transition:transform .6s var(--ease)}
.logowall .cell:hover img{transform:translateY(-4px) scale(1.05)}

/* ---- 现场：桌面端竖滚驱动横移的画廊；手机端原生横滑 ---- */
.scene .sechead{align-items:flex-end}
.scn-count{margin-left:auto;font-family:var(--cormo);font-style:italic;font-weight:600;font-size:28px;color:var(--gray);line-height:1;padding-bottom:6px;font-variant-numeric:tabular-nums}
.scn-count b{color:var(--red);font-weight:600}
.scn-pin{overflow:hidden}
.scn-track{display:flex;align-items:flex-start;gap:22px;padding:0 max(30px,calc((100vw - 1180px)/2 + 30px));height:clamp(380px,calc(100vh - var(--navh) - 210px),700px);will-change:transform}
.scn-i{margin:0;flex:0 0 auto;height:100%;position:relative;overflow:hidden;background:var(--paper-2)}
.scn-i.l{aspect-ratio:3/2}
.scn-i.p{aspect-ratio:2/3}
.scn-i.s{height:78%;align-self:flex-end}
.scn-i img{width:100%;height:100%;object-fit:cover;display:block;user-select:none;-webkit-user-drag:none}
.scn-bar{display:block;position:relative;height:2px;background:var(--hair);margin-top:26px}
.scn-bar b{position:absolute;inset:0;background:var(--ink);transform:scaleX(var(--sp,.125));transform-origin:0 50%}
html:not(.js-anim) .scn-pin,.scene.native .scn-pin{overflow-x:auto;scrollbar-width:none;cursor:grab}
html:not(.js-anim) .scn-pin::-webkit-scrollbar,.scene.native .scn-pin::-webkit-scrollbar{display:none}
html:not(.js-anim) .scn-i img{transform:none}

/* ---- 课程：左栏 = 示意图 + 同尺寸课堂实拍，一起吸顶 ---- */
.dg{position:static}
.cleft{position:sticky;top:calc(var(--navh) + 22px);display:flex;flex-direction:column;gap:28px}
.cphoto{margin:0;position:relative;overflow:hidden;aspect-ratio:16/10;background:var(--paper-2)}
.cphoto img{width:100%;height:100%;object-fit:cover;display:block;transition:transform 1.2s var(--ease)}
.cphoto:hover img{transform:scale(1.035)}
.cnum{font-size:clamp(52px,5.6vw,84px);color:#dcd7cd;line-height:1;padding-bottom:.08em;font-variant-numeric:lining-nums}
.layers .ly{transition:background .35s var(--ease),opacity .35s var(--ease),color .35s}
.layers .ly .lt,.layers .ly .lnum{transition:color .35s var(--ease)}
@media (hover:hover) and (min-width:641px){
  .layers:hover .ly{opacity:.42}
  .layers .ly:hover{opacity:1;background:var(--ink)}
  .layers .ly:hover .lt{color:var(--paper)}
  .layers .ly:hover .lnum{color:#8f8a82}
  .layers .ly:hover b{color:var(--red-2)}
}

/* ---- 线上课卡：悬停上抬、标题变红 ---- */
.olcard img{transition:transform .6s var(--ease),border-color .3s}
.olcard:hover img{transform:translateY(-5px);border-color:var(--ink)}
.olcard b{transition:color .3s}
.olcard:hover b{color:var(--red)}

/* ---- 对谈：悬停整行出红线，并浮出大头像 ---- */
.talks li{position:relative}
.talks li:not(.more)::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1.5px;background:var(--red);transform:scaleX(0);transform-origin:0 50%;transition:transform .55s var(--ease)}
.talks li:not(.more):hover::after{transform:scaleX(1)}
.talks .nm b{transition:color .3s}
.talks li:hover .nm b{color:var(--red)}
.gprev{position:fixed;left:0;top:0;z-index:180;width:150px;height:150px;border-radius:50%;overflow:hidden;pointer-events:none;border:3px solid var(--paper);box-shadow:0 0 0 1.5px var(--ink);transform:translate(-50%,-50%) scale(0);opacity:0;display:none}
.gprev img{width:100%;height:100%;object-fit:cover}

/* ---- 跟手圆标（只在可拖动区域出现） ---- */
.cur{position:fixed;left:0;top:0;z-index:190;width:86px;height:86px;margin:-43px 0 0 -43px;border-radius:50%;background:var(--red);color:#fff;display:none;align-items:center;justify-content:center;font-weight:900;font-size:14px;letter-spacing:.12em;pointer-events:none;transform:scale(0)}
@media (hover:hover) and (pointer:fine){.cur,.gprev{display:flex}}
[data-cursor]{cursor:grab}
[data-cursor]:active{cursor:grabbing}

/* ---- 工作之外：可拖动 ---- */
.lstrack{cursor:grab}
.lstrack.dragging{scroll-snap-type:none;scroll-behavior:auto;cursor:grabbing}
.lstrack img{transition:transform .8s var(--ease),filter .3s;user-select:none;-webkit-user-drag:none}

/* ---- 报尾：墨色底收口，巨型署名 ---- */
.colophon{background:var(--ink);color:var(--paper);border-top:0;margin-top:140px;position:relative;overflow:hidden}
.sec.band + .colophon,.book + .colophon{margin-top:0}
.colophon .contact{grid-template-columns:200px minmax(0,1fr) minmax(0,320px)}
.colophon .colored{border-top:3px solid var(--red);margin-top:0}
.colophon .contact{padding:72px 0 56px}
.colophon .contact h2{color:var(--paper)}
.colophon .contact .wx{color:var(--paper)}
.colophon .contact p{color:#c9c4ba}
.colophon .contact .qr{border-color:var(--paper)}
.colophon .contact .qrcap{color:#9a958c}
.colophon .contact .side{border-left-color:#3a3833}
.colophon .contact .side .k{color:var(--paper)}
.colophon .contact .side li{border-bottom-color:#2f2d29;color:#c9c4ba}
.colophon .contact .side li b{color:var(--paper)}
.colophon .ic{stroke:var(--paper)}
.colophon .ic [fill="#111111"]{fill:var(--paper)}
.colophon .ic [fill="#faf9f6"]{fill:var(--ink)}
.colophon .passalong{border-top-color:#3a3833}
.colophon .passalong .t{color:var(--paper)}
.colophon .passalong a{color:var(--red-2)}
.colophon .passalong a{background-image:linear-gradient(var(--red-2),var(--red-2))}
.bigmark{border-top:1px solid #3a3833;margin-top:8px;padding:clamp(22px,3.4vw,52px) 0 clamp(14px,2vw,30px);overflow:hidden;line-height:1;white-space:nowrap;text-align:center}
.bigmark span{display:inline-block;font-weight:900;font-size:min(240px,calc((100vw - 60px) * .146));letter-spacing:-.01em;color:var(--paper)}
.bigmark i{font-style:normal;color:var(--red-2);margin:0 .08em}
.colophon .footbar{border-top:1px solid #3a3833;color:#8b867d;padding:16px 0 30px;align-items:center}
.totop{color:var(--paper);font-weight:700;letter-spacing:.08em}
.totop:hover{color:var(--red-2)}

/* ---- 手机 ---- */
@media (max-width:860px){
  :root{--navh:52px}
  .tn-in{padding:0 18px;gap:12px}
  .tn-list{display:none}
  .tn-now{display:block;margin-left:auto;font-weight:900;font-size:15px;color:var(--red)}
  .tn-brand{font-size:15.5px}
  .tn-cta{font-size:14px;padding:7px 14px}
  .cleft{position:static;gap:18px}
  .colophon .contact{grid-template-columns:180px minmax(0,1fr)}
}
@media (max-width:640px){
  .tn-brand .ic-brand{display:none}
  .scn-count{font-size:21px}
  .scn-track{height:auto;gap:10px;padding:0 18px;align-items:stretch}
  .scn-i,.scn-i.s{height:300px;align-self:auto}
  .scn-i.p{height:300px}
  .scn-pin{overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  .scn-pin::-webkit-scrollbar{display:none}
  .scn-i{scroll-snap-align:start;scroll-margin-left:18px}
  .scn-i img{transform:none}
  .scn-bar{margin-top:18px}
  .colophon{margin-top:96px}
  .colophon .contact{grid-template-columns:1fr}
  .colophon .contact{padding:44px 0 34px}
  .bigmark span{font-size:calc((100vw - 36px) * .146)}
  .colophon .footbar{flex-direction:row;flex-wrap:wrap;gap:6px 16px}
}

/* ================= 动效初始态（只有 html.js-anim 时生效） ================= */
html.js-anim .rv{opacity:0;transform:translateY(26px)}
html.js-anim .rv.in{opacity:1;transform:none;transition:opacity 1s var(--ease),transform 1.1s var(--ease);transition-delay:var(--rvd,0s)}
html.js-anim .sechead::before,html.js-anim .course::before{transform:scaleX(0)}
html.js-anim .sechead.in::before,html.js-anim .course.in::before{transform:scaleX(1);transition:transform 1.2s var(--ease-io)}
html.js-anim .sechead .blk{transform:scaleY(0);transform-origin:50% 100%}
html.js-anim .sechead.in .blk{transform:none;transition:transform .7s var(--ease) .35s}
html.js-anim .ch>.ci{transform:translateY(108%)}
html.js-anim .in .ch>.ci,html.js-anim .ch.in>i{transform:none;transition:transform 1s var(--ease);transition-delay:calc(var(--ci,0) * 45ms + .15s)}
.imgrv{overflow:hidden}
html.js-anim .imgrv{clip-path:inset(12% 6% 12% 6%)}
html.js-anim .imgrv img{transform:scale(1.18)}
html.js-anim .imgrv.in{clip-path:inset(0 0 0 0);transition:clip-path 1.4s var(--ease-io)}
html.js-anim .imgrv.in img{transform:none;transition:transform 1.8s var(--ease)}
html.js-anim .portrait .ph.imgrv{clip-path:inset(0 0 100% 0)}
html.js-anim .portrait .ph.imgrv img{transform:none}
html.js-anim .portrait .ph.imgrv.in{clip-path:inset(0)}
/* 首屏开场 */
html.intro .masthead .topline,html.intro .mh-thick,html.intro .mh-red{transform:scaleX(0)}
html.intro .mh-title,html.intro .mh-strap{opacity:0}
html.intro .heroshot{clip-path:inset(50% 0 50% 0)}
html.intro .formula{opacity:0;transform:translateY(14px)}
html.intro .front,html.intro .ctarow{opacity:0;transform:translateY(24px)}
/* 经历时间线（沿用 09-26 的生长动画） */
html.js-anim .tl .n::before{transform:scaleY(0);transform-origin:50% 100%;transition:transform .42s ease-out var(--tld,0s)}
html.js-anim .tl .n .d::after{transform:translate(-50%,-50%) scale(0);transition:transform .35s cubic-bezier(.3,1.4,.5,1) calc(var(--tld,0s) + .25s)}
html.js-anim .tl .n .y,html.js-anim .tl .n .e{opacity:0;transform:translateY(6px);transition:opacity .45s ease-out calc(var(--tld,0s) + .3s),transform .45s ease-out calc(var(--tld,0s) + .3s)}
html.js-anim .tl .eralab{opacity:0;transition:opacity .6s ease-out 1.6s}
html.js-anim .tl.lit .n::before{transform:scaleY(1)}
html.js-anim .tl.lit .n .d::after{transform:translate(-50%,-50%) scale(1)}
html.js-anim .tl.lit .n .y,html.js-anim .tl.lit .n .e{opacity:1;transform:none}
html.js-anim .tl.lit .eralab{opacity:1}
/* 五层阶梯逐级点亮 */
html.js-anim .layers .ly{opacity:0;transform:translateX(-14px)}
html.js-anim .layers.lit .ly{opacity:1;transform:none;transition:opacity .6s var(--ease) var(--lyd,0s),transform .8s var(--ease) var(--lyd,0s),background .35s var(--ease)}
@media (hover:hover) and (min-width:641px){html.js-anim .layers.lit:hover .ly{opacity:.42;transition-delay:0s}html.js-anim .layers.lit .ly:hover{opacity:1}}
/* 示意图描线 */
html.js-anim .dg svg .dw-fade,html.js-anim .pp-dg svg .dw-fade{opacity:0;transition:opacity .5s ease-out var(--dwd,0s)}
html.js-anim .dg svg.drawn .dw-fade,html.js-anim .pp-dg svg.drawn .dw-fade{opacity:1}
.bignums .n,.leadline .cnt{font-variant-numeric:tabular-nums}
/* 链接下划线生长（沿用） */
.sylbtn,.moretalk .t a,.passalong a,.mh-strap a{background-image:linear-gradient(var(--red),var(--red));background-repeat:no-repeat;background-position:0 100%;background-size:0 2px;transition:background-size .45s var(--ease)}
.sylbtn:hover,.moretalk .t a:hover,.passalong a:hover,.mh-strap a:hover{background-size:100% 2px;opacity:1}
.moretalk .t a,.passalong a{padding-bottom:2px}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important}}

/* ---- 小字号统一抬到 12.5px，中文落宋体（第 2 轮评审） ---- */
.cmeta span,.quotes cite,.olh span,.wallhead .m,.qrcap,.contact .qrcap,.dg figcaption,.layers figcaption,.mh-strap,.footbar,.olcard span{font-size:12.5px}
.cmeta span{color:#5c5954;letter-spacing:.08em}
.quotes cite,.olh span,.wallhead .m{color:#5c5954}
.contact .side li,.cmeta div,.pt p,.steps p,.steps .get{text-wrap:pretty}
/* ---- 段距统一：所有大模块同一节奏 ---- */
.sec{margin-top:0;padding:clamp(64px,6.4vw,96px) 0}
.sec.band{padding:clamp(80px,7.6vw,112px) 0}
main.wrap{padding-bottom:clamp(24px,3vw,40px)}
@media (max-width:640px){.sec{margin-top:0;padding:52px 0}.sec.band{padding:60px 0 64px}}
/* ---- 段头：报头同款「粗墨线 + 一根朱砂线」贯穿全书，跟着画出来 ---- */
.sechead::after{content:"";position:absolute;left:0;right:0;top:10px;height:2px;background:var(--red);transform-origin:0 50%}
.sechead{padding-top:24px}
html.js-anim .sechead::after{transform:scaleX(0)}
html.js-anim .sechead.in::after{transform:scaleX(1);transition:transform 1.2s var(--ease-io) .18s}
.colophon .sechead::after{display:none}
/* ---- 首屏开场改为自上而下揭开 ---- */
html.intro .heroshot{clip-path:inset(0 0 100% 0)}

/* ---- 课程段专属：导航条里的章节名淡出，换成五级台阶（一根连续台阶线 + 红点走到当前层） ---- */
.tn-in{position:relative}
.tn-list{transition:opacity .35s var(--ease),transform .5s var(--ease)}
.tn-steps{position:absolute;right:calc(30px + var(--ctaw,96px) + 28px);top:0;bottom:0;display:flex;align-items:flex-end;padding-bottom:12px;opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .35s var(--ease),transform .5s var(--ease),visibility 0s .5s}
html.subnav .tn-list{opacity:0;transform:translateY(-8px);pointer-events:none}
html.subnav .tn-steps{opacity:1;visibility:visible;transform:none;transition:opacity .45s var(--ease) .1s,transform .6s var(--ease) .1s}
.tn-steps a{position:relative;z-index:1;display:flex;align-items:baseline;gap:6px;padding:0 16px 6px 10px;font-weight:900;font-size:14.5px;line-height:1.2;color:var(--gray);transform:translateY(calc(var(--i,0) * -4px));transition:color .3s}
.tn-steps a:focus-visible{outline-offset:2px}
.tn-steps a i{font-family:var(--cormo);font-style:italic;font-weight:600;font-size:14px;opacity:.8}
.tn-steps a:hover{color:var(--ink)}
.tn-steps a.past{color:var(--ink-2)}
.tn-steps a.on{color:var(--red)}
.tn-stair{position:absolute;left:0;top:0;width:100%;height:100%;overflow:visible;pointer-events:none}
.tn-stair path{fill:none;stroke-width:1.6;stroke-linejoin:miter}
.st-base{stroke:var(--hair)}
.st-past{stroke:var(--ink)}
.st-dot{fill:var(--red)}
@media (max-width:860px){
  html.subnav .tn-now{opacity:0}
  .tn-steps{right:calc(18px + var(--ctaw,80px) + 10px);padding-bottom:13px}
  html.subnav .tn-steps{left:12px;right:auto}
  html.subnav .tn-brand{opacity:0;pointer-events:none}
  .tn-brand{transition:opacity .35s}
  .tn-steps a{padding:0 10px 5px 6px;font-size:13px}
  .tn-steps a i{display:none}
}
/* ---- 炼金公式：元素逐个投入，等号落下，结果升起 ---- */
.formula .ft{display:inline-block}

/* ---- 公式行放大：运算符换 Cormorant 斜体朱砂 ---- */
.formula{font-size:clamp(16px,1.45vw,20px)}
.formula b{font-family:var(--serif);font-style:normal;font-weight:700;font-size:1.15em;line-height:1;margin:0 .34em;vertical-align:-.04em}
.formula .fg{white-space:nowrap}
.formula{position:relative}
.fline{position:absolute;left:0;height:2px;background:var(--red);transform-origin:100% 50%;pointer-events:none}
/* ---- 首屏舞台照：笔记本屏幕上主标题也在首屏内 ---- */
@media (min-width:641px){.heroshot img{height:clamp(240px,min(33vw,47vh),480px)}}

/* ---- 经历：主干改成一根连续的渐粗线（SVG），从 2001 往上长 ---- */
.tl.svgline .n::before{display:none}
.tl-spine{position:absolute;left:0;top:0;width:100%;height:100%;pointer-events:none;overflow:visible}
html.js-anim .tl-spine{clip-path:inset(100% 0 0 0)}
html.js-anim .tl.lit .tl-spine{clip-path:inset(0 0 0 0);transition:clip-path 1.1s var(--ease-io)}
.tl .n .d{z-index:1}

/* ---- 收尾：整本书往上翻走，露出压在底下的墨色封底 ---- */
.book{position:relative;z-index:1;background:var(--paper)}
@media (min-width:861px){
  html.reveal .book{box-shadow:0 40px 60px -30px rgba(0,0,0,.45)}
  html.reveal .colophon{position:sticky;bottom:0;z-index:0;margin-top:0}
}

/* ---- 矮屏笔记本（如 1366×768）：报尾压到一屏以内，合书效果照常 ---- */
@media (min-width:861px) and (max-height:820px){
  .colophon .contact{padding:44px 0 30px}
  .bigmark{padding:14px 0 8px}
  .colophon .passalong{padding:14px 0}
  .colophon .footbar{padding:12px 0 18px}
}
/* ---- 手机首屏：公式两行收住，标题完整落在首屏 ---- */
@media (max-width:640px){
  .formula{font-size:clamp(14px,3.9vw,18px)}
  .formula b{margin:0 .26em}
  .tn-steps a{transform:translateY(calc(var(--i,0) * -3px))}
}

/* ---- 二维码先占好位，避免加载后报尾整体下移 ---- */
.contact .qr img{aspect-ratio:1/1;width:100%;height:auto}

/* ---- 页边距随窗口平滑变化（10-08 Mars：中等窗口左右顶格）：大屏正文宽度不变，中屏留 56–64px，手机 18px ---- */
@media (min-width:641px){
  :root{--gut:clamp(40px,8vw,80px)}
  .wrap,.tn-in{max-width:calc(1120px + 2 * var(--gut));padding-left:var(--gut);padding-right:var(--gut)}
  .tn-steps{right:calc(var(--gut) + var(--ctaw,96px) + 28px)}
  .heroshot figcaption{padding-left:var(--gut);padding-right:var(--gut)}
}

/* ---- 课程层名放大，仅次于段名（10-09 Mars：不醒目） ---- */
.cword b{font-size:clamp(42px,4.6vw,58px)}
.cword i{font-size:clamp(19px,1.9vw,25px)}
.cword .ic-course{font-size:clamp(20px,2vw,26px)}
@media (max-width:640px){.cword b{font-size:32px}.cword i{font-size:17px}}

/* ---- 课程层名做成朱砂印章（10-09 Mars 选 B） ---- */
.cword{align-items:center}
.cword b{background:var(--red);color:#fff;padding:.12em .32em .1em;line-height:1;letter-spacing:.06em}

/* ---- 导航当前段落：朱砂底白字色块（10-09 Mars：高亮看不出来） ---- */
.tn-list a{transition:color .3s,background-color .35s var(--ease)}
.tn-list a.on{color:#fff;background:var(--red)}
.tn-list a.on::before{transform:scaleX(0)}
.tn-list a.on:hover{color:#fff}
@media (max-width:860px){.tn-now{background:var(--red);color:#fff;padding:3px 10px}.tn-now:empty{display:none}}