/* ============================================================
   方法论 · 长文式页面
   ============================================================ */

/* 封面 */
.essay-cover{padding:64px 0 0;background:#fff}
.cover-top{display:flex;justify-content:space-between;align-items:center;font-family:var(--num);font-size:10px;letter-spacing:.18em;color:var(--ink-3);text-transform:uppercase}
.cover-grid{display:grid;grid-template-columns:7.4fr 4.6fr;gap:60px;align-items:end;margin-top:28px}
.cover-title .kicker{margin-bottom:16px}
.cover-title h1{font-family:var(--serif);font-size:clamp(84px,11.5vw,156px);font-weight:700;line-height:.98;letter-spacing:.01em}
.cover-title h1 .dot{display:inline-block;width:.08em;height:.08em;border-radius:50%;background:var(--red);margin-left:.06em;vertical-align:.14em}
.cover-title .sub{margin-top:18px;font-family:var(--serif);font-size:clamp(20px,2vw,28px);font-weight:700;color:var(--ink-2);letter-spacing:.04em}
.cover-aside{padding-bottom:8px}
.cover-aside p{font-size:13.5px;line-height:1.95;color:var(--ink-2);max-width:28em}
.cover-aside .arrow-link{margin-top:24px;font-size:12.5px}
.cover-index{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--ink);margin-top:48px}
.cover-index a{display:block;padding:16px 18px 16px 0;border-right:1px solid var(--line);font-size:12px;color:var(--ink-2);transition:color .25s,padding-left .3s var(--ease)}
.cover-index a:last-child{border-right:none;padding-right:0}
.cover-index .n{display:block;margin-bottom:6px;font-family:var(--num);font-size:9.5px;letter-spacing:.16em;color:var(--red)}
.cover-index a:hover{color:var(--red);padding-left:4px}
.essay-fig{margin-top:50px}
.essay-fig .plate{position:relative;overflow:hidden;aspect-ratio:21/8.6;background:#060a18}
.essay-fig img{width:100%;height:100%;object-fit:cover;object-position:center 50%}
.essay-fig figcaption{display:flex;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line);font-size:10px;letter-spacing:.12em;color:var(--ink-3);text-transform:uppercase}
.essay-fig figcaption b{font-family:var(--num);font-weight:500;letter-spacing:.18em;color:var(--ink-2)}

/* 定义 */
.def{padding:118px 0 124px;background:#fff}
.def-grid{display:grid;grid-template-columns:7.4fr 4.6fr;gap:64px;align-items:start;margin-top:36px}
.def-copy h2{font-family:var(--serif);font-size:clamp(42px,5.4vw,76px);font-weight:700;line-height:1.35;letter-spacing:.004em}
.def-copy h2 .red{color:var(--red)}
.def-copy h2 .dot{display:inline-block;width:.1em;height:.1em;border-radius:50%;background:var(--red);margin-left:.08em;vertical-align:.1em}
.def-note{margin-top:24px;font-size:13.5px;line-height:1.95;color:var(--ink-2);max-width:30em}
.def-fig{position:relative;overflow:hidden;aspect-ratio:4/5;background:#ededeb;margin:0}
.def-fig img{width:100%;height:100%;object-fit:cover;object-position:center 45%;filter:grayscale(.2) saturate(.9) contrast(1.05)}
.def-fig figcaption{position:absolute;left:0;bottom:0;background:#fff;color:var(--ink-3);font-size:10px;letter-spacing:.1em;padding:8px 12px;text-transform:uppercase}
.def-doors{display:grid;grid-template-columns:1fr 1fr;margin-top:58px;border-top:1px solid var(--ink);border-bottom:1px solid var(--line)}
.def-door{display:grid;grid-template-columns:32px 1fr;gap:18px;padding:26px 48px 26px 0}
.def-door + .def-door{border-left:1px solid var(--line);padding-left:48px;padding-right:0}
.def-door .no{font-family:var(--num);font-size:11.5px;letter-spacing:.1em;color:var(--red);padding-top:4px}
.def-door h3{font-family:var(--serif);font-size:21px;font-weight:700}
.def-door p{margin-top:7px;font-size:12.5px;line-height:1.9;color:var(--ink-2);max-width:34em}
.def-door .eg{margin-top:11px;display:flex;flex-wrap:wrap;gap:8px}
.def-door .eg span{font-size:10.5px;color:var(--ink-3);border-bottom:1px solid var(--line);padding-bottom:3px}
.def-foot{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:30px;font-size:12px;color:var(--ink-3)}
.def-foot .arrow-link{font-size:12px}

/* 五步长文 */
.five{padding:104px 0 120px;background:#fff}
.five-head{display:grid;grid-template-columns:5fr 7fr;gap:60px;align-items:end;padding-bottom:34px;border-bottom:1px solid var(--ink)}
.five-head h2{font-family:var(--serif);font-size:clamp(38px,4.2vw,58px);font-weight:700;line-height:1.3}
.five-head p{font-size:13.5px;line-height:1.95;color:var(--ink-2);max-width:36em;padding-bottom:4px}
.step-block{display:grid;grid-template-columns:70px 1fr;gap:42px;padding:60px 0;border-bottom:1px solid var(--line)}
.step-no{font-family:var(--num);font-size:90px;font-weight:500;line-height:.8;color:var(--ink);letter-spacing:-.02em;padding-top:2px}
.step-inner{display:grid;grid-template-columns:1fr 1.05fr;gap:46px;align-items:start}
.step-block.rev .step-inner{grid-template-columns:1.05fr 1fr}
.step-block.rev .step-fig{order:-1}
.step-copy .step-kicker{font-family:var(--num);font-size:10px;letter-spacing:.18em;color:var(--red)}
.step-copy h3{margin-top:10px;font-family:var(--serif);font-size:clamp(28px,3vw,38px);font-weight:700;line-height:1.4}
.step-copy .lead{margin-top:14px;font-size:13.5px;line-height:1.95;color:var(--ink-2)}
.step-deliver{margin-top:24px;border-top:1px solid var(--line)}
.step-deliver div{display:grid;grid-template-columns:72px 1fr;gap:14px;padding:10px 0;border-bottom:1px solid var(--line-2);font-size:11.5px;line-height:1.8}
.step-deliver b{color:var(--ink);font-weight:700}
.step-deliver span{color:var(--ink-2)}
.step-deliver .cap b{color:var(--red)}
.step-fig{position:relative;overflow:hidden;aspect-ratio:4/3;background:#ededeb;margin:0}
.step-fig img{width:100%;height:100%;object-fit:cover;filter:grayscale(.2) saturate(.9) contrast(1.05);transition:transform .8s var(--ease)}
.step-block:hover .step-fig img{transform:scale(1.025)}
.step-fig figcaption{position:absolute;left:0;bottom:0;background:#fff;color:var(--ink-3);font-size:10px;letter-spacing:.1em;padding:8px 12px;text-transform:uppercase}

/* 价值阶梯 */
.ladder{background:var(--tint-band);padding:100px 0 118px}
.ladder-head{display:grid;grid-template-columns:5fr 7fr;gap:60px;align-items:end;padding-bottom:34px}
.ladder-head h2{font-family:var(--serif);font-size:clamp(38px,4.2vw,58px);font-weight:700;line-height:1.3}
.ladder-head p{font-size:13.5px;line-height:1.95;color:var(--ink-2);max-width:34em;padding-bottom:4px}
.ladder-stair{display:grid;grid-template-columns:repeat(4,1fr);align-items:end;margin-top:104px}
.rung{position:relative;height:var(--h);min-width:0;border-top:1px solid var(--ink);padding:22px 30px 0 0;transition:opacity .7s var(--ease),transform .7s var(--ease);transition-delay:calc(var(--i) * 100ms)}
.rung + .rung{padding-left:38px}
.rung::after{content:"";position:absolute;right:0;top:-64px;width:1px;height:64px;background:var(--ink);transform-origin:bottom;transition:transform .5s var(--ease);transition-delay:calc(var(--i) * 100ms + 320ms)}
.rung:last-child::after{display:none}
.rung-head{position:absolute;left:0;top:-64px;display:flex;align-items:flex-end;gap:14px;padding-bottom:12px}
.rung + .rung .rung-head{left:38px}
.rung .no{font-family:var(--num);font-size:54px;font-weight:500;line-height:.78;letter-spacing:-.02em;transition:color .3s}
.rung .level{font-family:var(--num);font-size:9.5px;letter-spacing:.18em;color:var(--ink-3);padding-bottom:4px}
.rung:hover .no{color:var(--red)}
.rung h3{font-family:var(--serif);font-size:26px;font-weight:700;line-height:1.35;transition:transform .35s var(--ease)}
.rung:hover h3{transform:translateX(3px)}
.rung .q{margin-top:14px;font-family:var(--serif);font-size:14px;font-weight:700;line-height:1.85;color:var(--ink)}
.rung .a{margin-top:10px;font-size:11.5px;line-height:1.85;color:var(--ink-3)}
.ladder-stair.is-anim .rung{opacity:0;transform:translateY(16px)}
.ladder-stair.is-anim .rung::after{transform:scaleY(0)}
.ladder-stair.is-anim.is-up .rung{opacity:1;transform:none}
.ladder-stair.is-anim.is-up .rung::after{transform:none}
.ladder-foot{display:flex;justify-content:space-between;gap:20px;margin-top:26px;font-family:var(--num);font-size:9.5px;letter-spacing:.16em;color:var(--ink-3);text-transform:uppercase}
.ladder-foot i{font-style:normal;color:var(--red);margin-left:6px}
@media(prefers-reduced-motion:reduce){
  .ladder-stair.is-anim .rung{opacity:1;transform:none;transition:none}
  .ladder-stair.is-anim .rung::after{transform:none;transition:none}
}

/* 实证 */
.proof{padding:104px 0 116px;background:#fff}
.proof-head{display:grid;grid-template-columns:5fr 7fr;gap:60px;align-items:end;padding-bottom:34px;border-bottom:1px solid var(--ink)}
.proof-head h2{font-family:var(--serif);font-size:clamp(36px,4.2vw,56px);font-weight:700;line-height:1.3}
.proof-head p{font-size:13.5px;line-height:1.95;color:var(--ink-2);max-width:34em;padding-bottom:4px}
.proof-grid{display:grid;grid-template-columns:5.4fr 6.6fr;gap:60px;margin-top:40px;align-items:start}
.proof-fig{position:relative;overflow:hidden;aspect-ratio:4/5;background:#ededeb;margin:0}
.proof-fig img{width:100%;height:100%;object-fit:cover;filter:grayscale(.3) contrast(1.06)}
.proof-fig figcaption{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;background:linear-gradient(180deg,transparent,rgba(0,0,0,.78));font-size:10.5px;line-height:1.7;color:rgba(255,255,255,.7)}
.proof-copy .big{font-family:var(--serif);font-size:clamp(64px,8vw,112px);font-weight:700;line-height:1;color:var(--ink)}
.proof-copy .big span{font-size:.22em;font-weight:700;color:var(--ink-3);margin-left:.12em}
.proof-copy .lead{margin-top:18px;font-size:13px;line-height:1.9;color:var(--ink-2);max-width:34em}
.proof-block{border-top:1px solid var(--line);padding:15px 0}
.proof-blocks{margin-top:26px}
.proof-block .k{font-family:var(--num);font-size:9.5px;letter-spacing:.16em;color:var(--ink-3)}
.proof-block ul{margin-top:8px;list-style:none}
.proof-block li{position:relative;padding:4px 0 4px 14px;font-size:11.5px;line-height:1.8;color:var(--ink-2)}
.proof-block li::before{content:"";position:absolute;left:0;top:13px;width:4px;height:4px;border-radius:50%;background:var(--ink-3)}
.proof-block.hot{border-left:2px solid var(--red);padding-left:16px}
.proof-block.hot .k{color:var(--red)}
.proof-block.hot li::before{background:var(--red)}
.proof-block.hot .res{margin-top:10px;font-size:11px;line-height:1.8;color:var(--red)}

/* 白皮书 */
.paper{background:var(--tint-band);padding:92px 0 108px}
.paper-box{display:grid;grid-template-columns:7fr 5fr;gap:60px;align-items:end;border-top:1px solid var(--ink);padding-top:34px}
.paper-copy h2{font-family:var(--serif);font-size:clamp(32px,3.8vw,48px);font-weight:700;line-height:1.4}
.paper-copy p{margin-top:16px;font-size:13px;line-height:1.95;color:var(--ink-2);max-width:38em}
.paper-list{display:flex;flex-wrap:wrap;gap:7px;margin-top:20px}
.paper-list span{border:1px solid var(--line);padding:6px 10px;font-size:10.5px;color:var(--ink-3)}
.paper-side{justify-self:end;text-align:right}
.paper-side .small{font-family:var(--num);font-size:9.5px;letter-spacing:.18em;color:var(--ink-3);margin-bottom:14px}

@media(max-width:1100px){
  .cover-grid{grid-template-columns:1fr;gap:30px;align-items:start}
  .cover-aside{padding-bottom:0;max-width:640px}
  .cover-index{grid-template-columns:repeat(3,1fr)}
  .cover-index a:nth-child(3){border-right:none}
  .cover-index a:nth-child(n+4){border-top:1px solid var(--line)}
  .def-grid{grid-template-columns:1fr;gap:32px}
  .def-fig{aspect-ratio:16/10;max-width:640px}
  .five-head,.ladder-head,.proof-head{grid-template-columns:1fr;gap:18px;padding-bottom:26px}
  .step-block{grid-template-columns:54px 1fr;gap:26px;padding:44px 0}
  .step-no{font-size:66px}
  .step-inner{grid-template-columns:1fr;gap:24px}
  .step-block.rev .step-inner{grid-template-columns:1fr}
  .step-block.rev .step-fig{order:0}
  .ladder-stair{display:block;margin-top:22px}
  .rung{height:auto;margin-left:calc(var(--i) * 7%);padding:20px 0 24px}
  .rung + .rung{padding-left:0}
  .rung::after{display:none}
  .rung-head{position:static;top:auto;left:auto;padding-bottom:8px}
  .rung + .rung .rung-head{left:auto}
  .rung .no{font-size:38px;line-height:1}
  .rung h3{font-size:23px}
  .rung .q{margin-top:10px}
  .ladder-foot{margin-top:18px}
  .proof-grid{grid-template-columns:1fr;gap:32px}
  .proof-fig{aspect-ratio:16/10;max-width:640px}
  .paper-box{grid-template-columns:1fr;gap:28px;align-items:start}
  .paper-side{justify-self:start;text-align:left}
}
@media(max-width:760px){
  .essay-cover{padding-top:36px}
  .cover-grid{margin-top:22px;gap:24px}
  .cover-title h1{font-size:clamp(46px,17vw,62px)}
  .cover-title .sub{font-size:18px;margin-top:12px}
  .cover-aside p{font-size:12.5px;line-height:1.85}
  .cover-index{grid-template-columns:1fr 1fr;margin-top:30px}
  .cover-index a{padding:12px 12px 12px 0;font-size:11px}
  .cover-index a:nth-child(2n){border-right:none}
  .cover-index a:nth-child(3){border-right:1px solid var(--line)}
  .cover-index a:nth-child(n+3){border-top:1px solid var(--line)}
  .essay-fig{margin-top:30px}
  .essay-fig .plate{aspect-ratio:16/10}
  .essay-fig figcaption{font-size:8.5px}
  .def{padding:78px 0 86px}
  .def-copy h2{font-size:34px;line-height:1.42}
  .def-note{font-size:12.5px;margin-top:16px}
  .def-fig{aspect-ratio:4/3}
  .def-doors{grid-template-columns:1fr;margin-top:36px}
  .def-door{padding:22px 0}
  .def-door + .def-door{border-left:none;border-top:1px solid var(--line);padding-left:0;padding-top:22px}
  .def-door h3{font-size:20px}
  .def-foot{flex-wrap:wrap;gap:10px}
  .five{padding:76px 0 86px}
  .five-head h2{font-size:32px}
  .step-block{grid-template-columns:1fr;gap:14px;padding:34px 0}
  .step-no{font-size:52px}
  .step-copy h3{font-size:28px}
  .step-deliver div{grid-template-columns:66px 1fr;gap:10px}
  .ladder{padding:76px 0 86px}
  .rung{margin-left:calc(var(--i) * 6%);padding:17px 0 20px}
  .rung .no{font-size:32px}
  .rung h3{font-size:21px}
  .rung .q{font-size:13px;line-height:1.8;margin-top:9px}
  .rung .a{font-size:11px;line-height:1.8;margin-top:7px}
  .ladder-foot{flex-wrap:wrap;gap:6px;font-size:8.5px;letter-spacing:.12em}
  .proof{padding:76px 0 86px}
  .proof-head h2{font-size:32px}
  .proof-copy .big{font-size:64px}
  .proof-fig{aspect-ratio:4/3}
  .paper{padding:70px 0 80px}
  .paper-copy h2{font-size:30px}
}

/* 白皮书 · 左侧留白 + 文件封面 */
.paper{background:var(--tint-band);padding:64px 0 100px}
.paper-wrap{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:80px;align-items:start;padding-left:clamp(0px,8vw,150px);position:relative}
.paper-index{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;gap:20px;padding-bottom:12px;border-bottom:1px solid rgba(17,17,17,.16);font-family:var(--num);font-size:9.5px;letter-spacing:.16em;color:var(--ink-3);text-transform:uppercase}
.paper-main{min-width:0}
.paper-eyebrow{font-family:var(--num);font-size:9.5px;letter-spacing:.18em;color:var(--red);text-transform:uppercase}
.paper-intro h2{margin-top:12px;font-family:var(--serif);font-size:clamp(38px,4.6vw,64px);font-weight:700;line-height:1.3}
.paper-lead{margin-top:16px;font-size:13.5px;line-height:1.95;color:var(--ink-2);max-width:34em}
.paper-content{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;margin-top:34px;padding-top:22px;border-top:1px solid var(--line)}
.paper-toc{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}
.paper-toc div{display:flex;align-items:baseline;gap:11px;padding:11px 0;border-bottom:1px solid rgba(17,17,17,.12)}
.paper-toc span{font-family:var(--num);font-size:10px;letter-spacing:.1em;color:var(--red)}
.paper-toc b{font-size:12px;font-weight:600;color:var(--ink-2)}
.paper-cta p{font-size:12px;line-height:1.85;color:var(--ink-2);max-width:26em}
.paper-cta .btn-red{margin-top:18px;font-size:12.5px}
.paper-cover{position:relative;display:flex;flex-direction:column;justify-content:space-between;min-height:430px;padding:26px 24px;background:#111;color:#f4f2ed;border-top:3px solid var(--red);box-shadow:0 28px 50px -42px rgba(0,0,0,.65)}
.pc-top,.pc-bottom{display:flex;justify-content:space-between;gap:16px;font-family:var(--num);font-size:8.5px;letter-spacing:.14em;color:rgba(255,255,255,.5);text-transform:uppercase}
.pc-title{display:flex;flex-direction:column;gap:9px}
.pc-title .pc-dot{width:12px;height:12px;border-radius:50%;background:var(--red);margin-bottom:12px}
.pc-title b{font-family:var(--serif);font-size:38px;font-weight:700;line-height:1.25;color:#fff}
.pc-title span:last-child{font-size:10px;letter-spacing:.08em;color:rgba(255,255,255,.55)}
@media(max-width:1100px){
  .paper-wrap{grid-template-columns:1fr;gap:30px;padding-left:clamp(0px,4vw,48px)}
  .paper-content{grid-template-columns:1fr;gap:24px}
  .paper-cover{max-width:360px;min-height:360px}
}
@media(max-width:760px){
  .paper{padding:56px 0 76px}
  .paper-wrap{padding-left:0}
  .paper-intro h2{font-size:32px}
  .paper-index{font-size:8px;letter-spacing:.1em}
  .paper-content{margin-top:26px}
  .paper-toc{grid-template-columns:1fr}
  .paper-cover{min-height:300px;padding:22px 20px}
  .pc-title b{font-size:30px}
}

/* 什么是红点：压缩高度 */
.def{padding:88px 0 96px}
.def-grid{gap:56px;margin-top:28px;align-items:start}
.def-copy h2{font-size:clamp(38px,4.6vw,60px);line-height:1.35}
.def-note{margin-top:16px;font-size:13px;line-height:1.85}
.def-fig{aspect-ratio:16/10}
.def-doors{margin-top:36px}
.def-door{padding:20px 40px 20px 0}
.def-door + .def-door{padding-left:56px}
.def-door p{margin-top:6px;font-size:12px;line-height:1.8}
.def-door .eg{margin-top:9px}
@media(max-width:1100px){
  .def-fig{aspect-ratio:16/10}
}
@media(max-width:760px){
  .def{padding:68px 0 78px}
  .def-copy h2{font-size:32px}
  .def-doors{margin-top:28px}
  .def-door{padding:18px 0}
  .def-door + .def-door{padding-left:0}
}

.proof-block.hot{padding-left:28px}

/* 什么是红点：再收一点高度 */
.def{padding:76px 0 84px}
.def-grid{margin-top:24px}
.def-fig{aspect-ratio:16/9}
.def-doors{margin-top:30px}
.def-door{padding:18px 40px 18px 0}
@media(max-width:760px){
  .def{padding:62px 0 72px}
  .def-fig{aspect-ratio:16/10}
}

/* 方法论 · 悬停交互补强 */
.essay-fig img,.def-fig img,.proof-fig img{transition:transform 1.1s var(--ease),filter .5s}
.essay-fig .plate:hover img,.def-fig:hover img,.proof-fig:hover img{transform:scale(1.02)}
.step-no{transition:color .35s}
.step-block:hover .step-no{color:var(--red)}
.step-deliver div{transition:background .3s,transform .35s var(--ease)}
.step-deliver div:hover{background:rgba(224,11,22,.025);transform:translateX(3px)}
.step-deliver b{transition:color .3s}
.step-deliver div:hover b{color:var(--red)}
.def-door{transition:background .3s,transform .35s var(--ease)}
.def-door:hover{background:rgba(224,11,22,.02);transform:translateX(3px)}
.def-door h3{transition:color .3s}
.def-door:hover h3{color:var(--red)}
.proof-block li{transition:background .3s,color .3s,padding-left .3s var(--ease)}
.proof-block li:hover{background:rgba(224,11,22,.03);color:var(--ink);padding-left:18px}
.rung .q,.rung .a{transition:color .3s}
.rung:hover .q{color:var(--red)}
.paper-toc div{transition:color .3s,transform .35s var(--ease)}
.paper-toc div:hover{transform:translateX(3px)}
.paper-toc div:hover b{color:var(--red)}
.paper-toc b{transition:color .3s}
.paper-cover{transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.paper-cover:hover{transform:translateY(-3px);box-shadow:0 34px 58px -40px rgba(0,0,0,.72)}
@media(prefers-reduced-motion:reduce){
  .essay-fig img,.def-fig img,.proof-fig img,.step-no,.step-deliver div,.def-door,.proof-block li,.rung .q,.rung .a,.paper-toc div,.paper-cover{transition:none}
  .essay-fig .plate:hover img,.def-fig:hover img,.proof-fig:hover img,.step-deliver div:hover,.def-door:hover,.proof-block li:hover,.paper-toc div:hover,.paper-cover:hover{transform:none}
}

.paper-list span{transition:border-color .25s,color .25s,background .25s}
.paper-list span:hover{border-color:var(--red);color:var(--ink);background:#fff}