/* 个人站各页：首页、搭子群、视频与系列、技能书、实验室、问答广场、选题投票、关于我 */

/* ---------- 首页 ---------- */

/* 首页：左边文字，右边旋转的玻璃楼梯 */
.s-page.p-home { max-width: none; }
.s-hero { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); align-items: center; gap: clamp(20px, 3vw, 60px); min-height: calc(100vh - clamp(40px, 8vh, 96px) - 90px); }
.stairs-stage {
  position: relative;
  height: clamp(520px, 84vh, 1000px);
  margin-right: calc(-1 * clamp(28px, 6vw, 120px));
  cursor: grab;
  touch-action: pan-y;
  opacity: 0;
  transform: translateY(24px) scale(.98);
  transition: opacity 1.2s ease-out, transform 1.4s var(--ease-out);
}
.stairs-stage.ready { opacity: 1; transform: none; }
.stairs-stage.grabbing { cursor: grabbing; }
/* 画布绝对定位铺满舞台：它的像素尺寸不能反过来把舞台撑高 */
.stairs-stage canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  /* 上下两头和四周渐隐，看不到楼梯的尽头，也和页面背景融在一起 */
  -webkit-mask-image: linear-gradient(transparent 0, #000 22%, #000 78%, transparent 100%), radial-gradient(ellipse 62% 72% at 50% 50%, #000 52%, transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(transparent 0, #000 22%, #000 78%, transparent 100%), radial-gradient(ellipse 62% 72% at 50% 50%, #000 52%, transparent 100%);
  mask-composite: intersect;
}
.stairs-stage.failed { display: none; }
/* 首页左栏的交流群：左边群里有什么和微信号，右边二维码；磨砂底，浮在楼梯画面上 */
.s-hgroup {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 20px;
  max-width: 34em;
  margin-top: clamp(18px, 3.4vh, 32px);
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--line-2);
  border-radius: 18px;
  background: var(--card);
  backdrop-filter: blur(16px) saturate(1.2);
}
.s-hgroup h2 { display: flex; align-items: center; gap: 8px; margin: 0 0 10px; font-size: 16px; letter-spacing: .06em; }
.s-hgroup h2 .ic { width: 18px; height: 18px; }
.s-hgroup ul { display: grid; gap: 5px; margin: 0; padding: 0; list-style: none; }
.s-hgroup li { position: relative; padding-left: 16px; font-size: 13px; line-height: 1.5; color: var(--text-2); }
.s-hgroup li::before { content: ''; position: absolute; left: 1px; top: .72em; width: 7px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--blue), var(--pink)); }
.s-hgroup-id { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; padding-top: 10px; border-top: 1px dashed var(--line-2); font-size: 13px; }
.s-hgroup-id span { color: var(--text-3); }
.s-hgroup-id b { font-family: var(--font-latin); font-weight: 600; }
.s-hgroup-qr { display: flex; flex-direction: column; align-items: center; gap: 8px; text-align: center; }
.s-hgroup-qr .s-qr { width: 132px; }
.stairs-stage.pointing { cursor: pointer; }
.stairs-tip {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  display: grid;
  gap: 2px;
  max-width: 280px;
  padding: 9px 13px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 12px;
  background: rgba(10, 12, 22, .72);
  backdrop-filter: blur(12px) saturate(1.3);
  box-shadow: 0 14px 40px -12px rgba(0, 0, 0, .7);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  will-change: transform;
}
.stairs-tip.on { opacity: 1; }
.stairs-tip small { font-size: 11.5px; letter-spacing: .04em; color: var(--text-3); }
.stairs-tip b { font-size: 14px; font-weight: 600; line-height: 1.45; }

/* ---------- 搭子群 ---------- */

.s-group {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(24px, 3vw, 40px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background:
    radial-gradient(600px 300px at 0% 0%, rgba(91, 140, 255, .12), transparent 70%),
    radial-gradient(500px 300px at 100% 100%, rgba(255, 122, 217, .08), transparent 70%),
    var(--card);
}
.s-group h2 { display: flex; align-items: center; gap: 10px; margin: 0 0 18px; font-size: 22px; letter-spacing: .06em; }
.s-group h2 .ic { width: 22px; height: 22px; }
.s-group ul { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.s-group li { position: relative; padding-left: 20px; color: var(--text-2); }
.s-group li::before { content: ''; position: absolute; left: 2px; top: .8em; width: 9px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--blue), var(--pink)); }
.s-group-id { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 22px; padding-top: 18px; border-top: 1px dashed var(--line-2); font-size: 13.5px; }
.s-group-id span { color: var(--text-3); }
.s-group-id b { font-family: var(--font-latin); font-weight: 600; }
.s-group-qr { display: flex; flex-direction: column; align-items: center; gap: 10px; text-align: center; }
.s-group-qr > small { max-width: 180px; font-size: 12px; color: var(--text-3); }

/* ---------- 视频与系列 ---------- */

.s-eps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.s-ep { border-bottom: 1px solid var(--line); animation: up .5s var(--ease-out) backwards; }
.s-ep a { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 18px; padding: 16px 10px; border-radius: 12px; color: inherit; text-decoration: none; transition: background .25s; }
.s-ep a:hover { background: var(--card-hover); }
.s-ep-main { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 0; min-width: 0; }
.s-ep-main b { font-size: 15.5px; font-weight: 600; }
.s-ep-main small { display: flex; flex-basis: 100%; align-items: center; gap: 8px; font-size: 12.5px; color: var(--text-3); }
.s-ep-main small i { width: 7px; height: 7px; border-radius: 50%; }
.s-ep-res { display: inline-flex; align-items: center; gap: 6px; font: 500 13px var(--font-latin); color: var(--text-3); }
.s-ep-res .ic { width: 16px; height: 16px; }
.s-points { margin: 0; padding: 0; list-style: none; counter-reset: pt; }
.s-points li { display: grid; grid-template-columns: 36px 1fr; gap: 10px; padding: 12px 0; border-bottom: 1px solid var(--line); counter-increment: pt; line-height: 1.8; color: var(--text-2); }
.s-points li::before { content: counter(pt, decimal-leading-zero); font: 600 13px/1.8 var(--font-latin); color: var(--text-3); }
.s-res { display: grid; gap: 14px; }
.s-res article { padding: 18px 20px; border: 1px solid var(--line); border-radius: 16px; background: var(--card); }
.s-res h3 { display: flex; align-items: center; gap: 10px; margin: 0 0 12px; font-size: 15px; font-weight: 600; }
.s-res .s-link { margin-top: 0; }
.s-res-desc { margin: 0 0 14px; font-size: 14px; line-height: 1.7; color: var(--text-2); }
.s-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 56px; }
.s-pn a { display: flex; flex-direction: column; gap: 4px; min-width: 0; padding: 18px 20px; border: 1px solid var(--line); border-radius: 16px; text-decoration: none; transition: border-color .25s, background .25s; }
.s-pn a:hover { border-color: var(--line-2); background: var(--card-hover); }
.s-pn small { font-size: 12px; letter-spacing: .2em; color: var(--text-3); }
.s-pn b { overflow: hidden; font-size: 15px; font-weight: 600; text-overflow: ellipsis; white-space: nowrap; }
.s-pn .next { text-align: right; }
/* 视频页的系列表：一行一个系列，点一行只看这个系列 */
.s-stable { width: 100%; margin-bottom: clamp(36px, 6vh, 56px); border-collapse: collapse; font-size: 14px; }
.s-stable th { padding: 0 14px 10px; border-bottom: 1px solid var(--line-2); font-size: 12px; font-weight: 500; letter-spacing: .2em; color: var(--text-3); text-align: left; white-space: nowrap; }
.s-stable td { padding: 16px 14px; border-bottom: 1px solid var(--line); vertical-align: middle; color: var(--text-2); }
.s-stable tbody tr { cursor: pointer; transition: background .25s; }
.s-stable tbody tr:hover { background: var(--card-hover); }
.s-stable tbody tr.on { background: color-mix(in srgb, var(--c) 10%, transparent); }
.s-stable tbody tr.on td:first-child { box-shadow: inset 3px 0 0 var(--c); }
.s-st-name { display: inline-flex; align-items: center; gap: 10px; font-size: 15.5px; font-weight: 650; color: var(--text); white-space: nowrap; }
.s-st-name i { width: 9px; height: 9px; border-radius: 50%; background: var(--c); box-shadow: 0 0 10px var(--c); }
.s-stable .s-st-n { width: 72px; text-align: right; }
.s-stable td.s-st-n { font: 600 15px var(--font-latin); color: var(--text); }
.s-st-last a { display: block; max-width: 22em; overflow: hidden; color: var(--text); text-decoration: none; text-overflow: ellipsis; white-space: nowrap; }
.s-st-last a:hover { text-decoration: underline; text-underline-offset: 3px; }
.s-st-last small { font-size: 12px; color: var(--text-3); }
.s-eps-h { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 8px; }
.s-eps-h h2 { margin: 0; font-size: 18px; letter-spacing: .06em; }
.s-eps-all { border: 0; background: none; color: var(--text-3); font: 13px var(--font); cursor: pointer; transition: color .25s; }
.s-eps-all:hover { color: var(--text); }

/* ---------- 技能书 ---------- */

.s-works { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(260px, 100%), 1fr)); gap: 14px; }
.s-work {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  cursor: pointer;
  transition: border-color .3s, background .3s, transform .45s var(--ease-spring);
  animation: up .5s var(--ease-out) backwards;
}
.s-work:hover { border-color: var(--line-2); background: var(--card-hover); transform: translateY(-2px); }
.s-work p { flex: 1; margin: 0; font-size: 13.5px; line-height: 1.75; color: var(--text-2); }
.s-work-h { display: flex; align-items: center; gap: 10px; }
.s-work-h h3 { flex: 1; min-width: 0; margin: 0; font-size: 15.5px; font-weight: 650; line-height: 1.4; }
.s-work-ic { flex: none; display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 11px; background: var(--card-2); font-size: 19px; }
.s-work-ic { border-color: color-mix(in srgb, var(--t, #8890aa) 30%, transparent); background: color-mix(in srgb, var(--t, #8890aa) 14%, transparent); color: var(--t, var(--text)); }
.s-work-ic .ic { width: 20px; height: 20px; }
.s-wd-h .s-work-ic .ic { width: 32px; height: 32px; }
.s-work-h.big { padding-right: 40px; }
.s-work-h.big .s-work-ic { width: 52px; height: 52px; border-radius: 14px; font-size: 26px; }
.s-work-h.big h3 { font-size: 20px; }
.s-work-f { display: flex; align-items: center; gap: 4px; }
/* 技能书：卡片是链接，点开进详情页 */
a.s-work { color: inherit; text-decoration: none; }
.s-models { display: flex; flex-wrap: wrap; gap: 6px; }
.s-models span { padding: 1px 8px; border-radius: 6px; background: var(--card-2); font: 500 11.5px var(--font-latin); color: var(--text-2); }
.s-wd-h { display: flex; align-items: center; gap: 18px; margin-bottom: 8px; }
.s-wd-h .s-work-ic { width: 64px; height: 64px; border-radius: 18px; font-size: 32px; }
.s-wd-h .s-kicker { margin-bottom: 6px; letter-spacing: .14em; }
.s-wd-models { display: flex; align-items: center; gap: 10px; margin-top: 16px; font-size: 12.5px; color: var(--text-3); }
.s-wd-p { max-width: 40em; margin: 0; font-size: 15px; line-height: 1.9; color: var(--text-2); }

/* ---------- 实验室 ---------- */

.s-apps { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr)); gap: 16px; }
.s-app { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 18px; background: var(--card); overflow: hidden; transition: border-color .3s, transform .45s var(--ease-spring); }
.s-app:hover { border-color: var(--line-2); transform: translateY(-2px); }
.s-app-cover { display: grid; place-items: center; aspect-ratio: 16 / 9; background: radial-gradient(circle at 28% 20%, rgba(255, 255, 255, .28), transparent 52%), linear-gradient(135deg, var(--c1), var(--c2)); overflow: hidden; }
.s-app-cover span { font: 800 54px var(--font); color: rgba(255, 255, 255, .92); text-shadow: 0 6px 30px rgba(0, 0, 0, .25); transition: transform .6s var(--ease-spring); }
.s-app:hover .s-app-cover span { transform: scale(1.08) rotate(-4deg); }
.s-app-cover .ic { width: 54px; height: 54px; color: rgba(255, 255, 255, .94); stroke-width: 1.5; transition: transform .6s var(--ease-spring); }
.s-app:hover .s-app-cover .ic { transform: scale(1.08) rotate(-4deg); }
.s-app-body { display: flex; flex: 1; flex-direction: column; gap: 8px; padding: 16px 18px 18px; }
.s-app-body h3 { margin: 0; font-size: 15.5px; }
.s-app-body p { flex: 1; margin: 0; font-size: 13px; line-height: 1.7; color: var(--text-2); }
.s-short { align-self: flex-start; padding: 2px 8px; border-radius: 6px; background: var(--code); font: 12px var(--mono); color: var(--text-3); }
.s-app-acts { display: flex; gap: 8px; margin-top: 6px; }
.p-apps .s-lead { max-width: none; }
.s-lab-how {
  margin-bottom: clamp(28px, 4.5vh, 44px);
  padding: 26px 28px 22px;
  border-radius: 20px;
  background:
    radial-gradient(520px 360px at 18% 0%, rgba(91, 140, 255, .14), transparent 62%),
    radial-gradient(480px 360px at 100% 100%, rgba(255, 122, 217, .08), transparent 62%),
    var(--card-2);
}
.s-lab-demo { max-width: 920px; margin: 0 auto; }
.s-lab-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; max-width: 920px; margin: 22px auto 0; padding: 0; list-style: none; }
.s-lab-steps li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; line-height: 1.65; color: var(--text-2); }
.s-lab-steps b { display: grid; flex: none; place-items: center; width: 24px; height: 24px; margin-top: 1px; border: 1px solid var(--line-2); border-radius: 50%; font: 600 12px var(--font-latin); color: var(--text); }

/* ---------- 问答广场 ---------- */

.s-ask { display: grid; gap: 10px; margin-bottom: 30px; padding: 16px; border: 1px solid var(--line-2); border-radius: 18px; background: var(--card); transition: border-color .3s, box-shadow .3s; }
.s-ask:focus-within { border-color: var(--text-3); box-shadow: 0 0 0 4px var(--card-2); }
.s-ask textarea { width: 100%; min-height: 64px; padding: 2px 4px; border: 0; outline: 0; resize: vertical; background: transparent; color: var(--text); font: 15px/1.7 var(--font); }
.s-ask-row { display: flex; align-items: center; gap: 10px; }
.s-ask-row input { flex: 1; }
.s-ask-me { display: flex; flex: 1; align-items: center; gap: 10px; min-width: 0; height: 42px; padding: 0 14px 0 7px; border: 1px solid var(--line); border-radius: 11px; background: var(--field); font-size: 14px; color: var(--text-3); }
.s-ask-me[hidden] { display: none; }
.s-ask-me .m-av { width: 28px; height: 28px; font-size: 12px; }
.s-ask-me > .ic { flex: none; width: 17px; height: 17px; margin-left: 7px; }
.s-ask-me b { overflow: hidden; font-weight: 600; color: var(--text); text-overflow: ellipsis; white-space: nowrap; }
.s-ask-me small { flex: none; font-size: 12px; }
.s-ask-me span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.s-qa { border-top: 1px solid var(--line); }
.s-q { padding: 22px 4px; border-bottom: 1px solid var(--line); animation: up .5s var(--ease-out) backwards; }
.s-q:nth-child(2) { animation-delay: .04s; }
.s-q:nth-child(3) { animation-delay: .08s; }
.s-q:nth-child(n + 4) { animation-delay: .12s; }
.s-q-h { display: flex; align-items: flex-start; gap: 16px; }
.s-q-h h3 { flex: 1; margin: 0; font-size: 16px; font-weight: 600; line-height: 1.6; }
.s-like {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--text-3);
  font: 500 13px var(--font-latin);
  cursor: pointer;
  transition: color .25s, border-color .25s;
}
.s-like .ic { width: 15px; height: 15px; }
.s-like:hover { color: var(--text); border-color: var(--line-2); }
.s-like.on { color: var(--pink); border-color: color-mix(in srgb, var(--pink) 45%, transparent); }
.s-like.on .ic { fill: currentColor; animation: pop .45s var(--ease-spring); }
@keyframes pop { 40% { transform: scale(1.35); } }
.s-q-who { display: block; margin-top: 4px; font-size: 12px; color: var(--text-3); }
.s-a { display: flex; gap: 12px; margin-top: 14px; padding: 14px 16px; border-radius: 14px; background: var(--card-2); }
.s-a-av {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: conic-gradient(from 200deg, var(--blue), var(--violet), var(--pink), var(--orange), var(--blue));
  color: #fff;
  font-size: 12.5px;
  font-weight: 700;
}
.s-a b { font-size: 13px; }
.s-a p { margin: 4px 0 0; font-size: 14px; line-height: 1.8; color: var(--text-2); }
.s-a small { display: block; margin-top: 6px; font-size: 11.5px; color: var(--text-3); }
.s-a.wait { align-items: center; border: 1px dashed var(--line-2); background: transparent; }
.s-a.wait p { margin: 0; font-size: 13px; color: var(--text-3); }
.s-a.wait .s-a-av { filter: grayscale(1); opacity: .45; }

/* ---------- 选题投票 ---------- */

.s-propose { display: flex; gap: 10px; margin-bottom: 26px; }
.s-propose input { flex: 1; height: 44px; }
.s-topics { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.s-topic { display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; align-items: center; gap: 16px; padding: 16px 4px; border-bottom: 1px solid var(--line); }
.s-rank { font: 700 20px var(--font-latin); text-align: center; color: var(--text-3); }
.s-topic:nth-child(-n + 3) .s-rank { color: var(--text); }
.s-topic-main { display: grid; gap: 3px; min-width: 0; }
.s-topic-main b { font-size: 15px; font-weight: 600; }
.s-topic-main small { font-size: 12px; color: var(--text-3); }
.s-topic-bar { display: block; height: 4px; margin-top: 6px; border-radius: 4px; background: var(--line); }
.s-topic-bar i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--blue), var(--violet)); }
.s-topic.on .s-topic-bar i { background: linear-gradient(90deg, var(--blue), var(--pink)); }
.s-topic .s-btn { min-width: 74px; font-family: var(--font-latin); }

/* ---------- 关于我 ---------- */

.s-main:has(> .p-about) { padding-bottom: clamp(32px, 5vh, 56px); }
.s-about { display: grid; grid-template-columns: clamp(150px, 22vh, 190px) minmax(0, 1fr); align-items: center; gap: clamp(24px, 4vw, 56px); }
#sec-subscribe { margin-top: clamp(32px, 6vh, 64px); scroll-margin-top: 24px; }
.s-portrait {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 5;
  border-radius: 20px;
  background: radial-gradient(circle at 30% 25%, rgba(255, 255, 255, .2), transparent 55%), conic-gradient(from 200deg, var(--blue), var(--violet), var(--pink), var(--orange), var(--blue));
  overflow: hidden;
}
.s-portrait.has-img img { width: 100%; height: 100%; object-fit: cover; }
.s-portrait span { font: 800 60px var(--font); color: rgba(255, 255, 255, .92); }
.s-portrait small { position: absolute; bottom: 12px; font-size: 11.5px; letter-spacing: .2em; color: rgba(255, 255, 255, .75); }
.s-story p { max-width: 40em; margin: 0 0 14px; font-size: 15.5px; line-height: 2; color: var(--text-2); }
.s-story p:first-child { font-size: 17px; color: var(--text); }
.s-subs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.s-subs article { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; padding: 4px clamp(18px, 2.4vw, 32px); border-left: 1px solid var(--line); }
.s-subs article:first-child { padding-left: 0; border-left: 0; }
.s-subs h3 { display: flex; align-items: center; gap: 9px; margin: 0; font-size: 16px; }
.s-subs p { margin: 0 0 6px; font-size: 13.5px; color: var(--text-2); }
/* 公众号那一格：二维码放在字的右边，整行矮一点 */
.s-subs article:first-child { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-content: start; gap: 10px 16px; }
.s-subs article:first-child .s-qr { grid-column: 2; grid-row: 1 / span 2; width: 100px; border-radius: 12px; }
.s-mail { display: flex; gap: 8px; width: 100%; }
.s-mail input { flex: 1; height: 34px; }

/* ---------- 白天 ---------- */

body.day .stairs-tip { background: rgba(255, 255, 255, .84); border-color: rgba(20, 30, 60, .1); box-shadow: 0 14px 40px -14px rgba(20, 30, 60, .3); }
body.day .s-group {
  background:
    radial-gradient(600px 300px at 0% 0%, rgba(91, 140, 255, .1), transparent 70%),
    radial-gradient(500px 300px at 100% 100%, rgba(255, 122, 217, .08), transparent 70%),
    rgba(255, 255, 255, .7);
}

@media (min-width: 821px) {
  /* 楼梯淡入时会往下错一点，不能因此多出滚动条 */
  .s-main:has(> .p-home) { padding-top: 0; padding-bottom: 0; overflow: clip; }
  .p-home .s-hero { height: 100vh; min-height: 540px; grid-template-rows: minmax(0, 1fr); }
  /* 楼梯画面铺满整个屏幕（侧栏底下也是），文字和侧栏浮在上面。
       这一块不能有 transform 动画，否则全屏的画布会被它框住，所以入场动画只给文字 */
  .p-home.in > .s-hero { animation: none; }
  .p-home.in .s-hero-text { animation: rise .9s var(--ease-out) backwards; }
  .p-home .s-hero-text { position: relative; z-index: 1; }
  .p-home .stairs-stage { position: fixed; inset: 0; z-index: 0; height: auto; margin: 0; }
  .p-home .stairs-stage canvas { -webkit-mask-image: none; mask-image: none; }
  /* 文字那一侧压一层很淡的底色，背后有窗户和光也看得清字 */
  .p-home .stairs-stage::after { content: ''; position: absolute; inset: 0; z-index: 1; background: linear-gradient(90deg, var(--scrim) 0, var(--scrim) 24%, transparent 60%); pointer-events: none; }
  #site:has(.p-home) .s-side { backdrop-filter: blur(20px) saturate(1.15); }
  .p-home .s-title { font-size: clamp(30px, min(3.8vw, 7.2vh), 68px); }
  .p-home .s-lead { margin-top: clamp(12px, 2.2vh, 20px); line-height: 1.8; }
}

@media (min-width: 821px) and (max-height: 720px) {
  .p-home .s-lead { font-size: 14px; }
}

@media (max-width: 820px) {
  .s-hero { grid-template-columns: minmax(0, 1fr); min-height: 0; }
  .stairs-stage { height: 64vh; margin: 0 -20px; }
  .s-hgroup { gap: 14px; padding: 16px; }
  .s-lab-how { padding: 18px 12px; }
  .s-lab-steps { grid-template-columns: minmax(0, 1fr); gap: 10px; margin-top: 18px; }
  .s-stable .s-st-desc { display: none; }
  .s-stable th, .s-stable td { padding-left: 8px; padding-right: 8px; }
  .s-st-last a { max-width: 11em; }
  .s-ask-row .s-seg { flex-basis: 100%; }
  .s-hgroup-qr .s-qr { width: 104px; }
  .s-group { grid-template-columns: minmax(0, 1fr); }
  .s-about { grid-template-columns: minmax(0, 1fr); }
  .s-portrait { width: 160px; }
  .s-subs { grid-template-columns: minmax(0, 1fr); }
  .s-subs article { padding: 18px 0; border-top: 1px solid var(--line); border-left: 0; }
  .s-subs article:first-child { padding-top: 4px; border-top: 0; }
  .s-ep a { gap: 12px; padding: 14px 4px; }
  .s-pn { grid-template-columns: minmax(0, 1fr); }
  .s-ask-row { flex-wrap: wrap; }
  .s-ask-row input, .s-ask-me { flex-basis: 100%; }
  .s-ask-row .s-btn { flex: 1; }
}