/* 分屏演示动画（split-demo.js）：平板 / 电脑外框，左边浏览器里的阅读空间，右边欧路词典 */
.sd { margin: 46px 0 0; text-align: center; font-family: var(--n-font); }
.sd h2 { font-size: 22px; margin: 0 0 6px; }
.sd-lead { color: var(--n-muted); font-size: 15px; margin: 0 0 16px; }
.sd-note { font-size: 11px; color: var(--n-faint); margin: 0; }
.sd-tabs { display: inline-flex; background: rgb(241, 241, 239); border-radius: 980px; padding: 3px; margin-bottom: 22px; }
.sd-tabs button { border: 0; background: none; font: 500 13px var(--n-font); color: var(--n-muted); padding: 6px 18px; border-radius: 980px; cursor: pointer; }
.sd-tabs button.on { background: #fff; color: var(--n-text); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.sd-stage { padding: 4px 0 50px; margin-bottom: -26px; min-width: 0; overflow-x: clip; }

/* 外框 */
.sd-device { position: relative; margin: 0 auto; width: 640px; text-align: left; }
.sd-device.ipad { background: #1d1d1f; border-radius: 30px; padding: 14px; box-shadow: 0 18px 40px rgba(0, 0, 0, .14); }
.sd-device.mac { width: 760px; background: #1d1d1f; border-radius: 14px 14px 0 0; padding: 12px 12px 18px; box-shadow: 0 18px 40px rgba(0, 0, 0, .12); }
.sd-base { display: none; }
.sd-device.mac .sd-base { display: block; position: absolute; left: -6%; right: -6%; bottom: -12px; height: 12px; background: linear-gradient(#d4d5d9, #a9abb0); border-radius: 0 0 12px 12px; }
.sd-device.mac .sd-base::before { content: ""; position: absolute; left: 42%; right: 42%; top: 0; height: 5px; background: #9c9ea3; border-radius: 0 0 6px 6px; }
.sd-screen { position: relative; display: grid; grid-template-columns: 1.15fr 6px 1fr; background: #fff; border-radius: 17px; overflow: hidden; height: 460px; }
.sd-device.mac .sd-screen { grid-template-columns: 1fr 4px 1fr; border-radius: 4px; height: 470px; }
.sd-pane { position: relative; overflow: hidden; min-width: 0; }
.sd-split { background: #e9e9eb; position: relative; }
.sd-split::after { content: ""; position: absolute; left: 1px; top: 50%; width: 4px; height: 34px; margin-top: -17px; border-radius: 4px; background: #b8b8bd; }
.sd-device.mac .sd-split { background: #d9d9dc; }
.sd-device.mac .sd-split::after { display: none; }

/* ---- 左边：浏览器里的阅读空间 ---- */
.sd-url { display: flex; align-items: center; gap: 8px; height: 26px; padding: 0 10px; background: #f5f5f7; border-bottom: 1px solid #e6e6e8; font-size: 9.5px; color: #6e6e73; }
.sd-url span { flex: 1; text-align: center; background: #e9e9ec; border-radius: 6px; padding: 2px 0; }
.sd-lights { display: none; gap: 4px; }
.sd-lights b { width: 8px; height: 8px; border-radius: 50%; background: #ff5f57; }
.sd-lights b:nth-child(2) { background: #febc2e; } .sd-lights b:nth-child(3) { background: #28c840; }
.sd-device.mac .sd-lights { display: inline-flex; }
.sd-page { padding: 0 14px; color: var(--n-text); }
.sd-nav { display: flex; align-items: center; justify-content: space-between; height: 34px; border-bottom: 1px solid var(--n-line); margin: 0 -14px 8px; padding: 0 14px; }
.sd-logo { width: 24px; height: 24px; border: 1.5px solid #2a3c9e; border-radius: 50%; display: grid; place-items: center; font: italic 700 7px var(--n-font); color: #2a3c9e; }
.sd-links { font-size: 9.5px; color: var(--n-muted); }
.sd-lock { display: flex; gap: 8px; align-items: center; border: 1px solid var(--n-line); background: #fafafa; border-radius: 7px; padding: 5px 7px; margin-bottom: 10px; font-size: 8.5px; color: var(--n-muted); line-height: 1.4; }
.sd-seg { display: inline-flex; background: #eee; border-radius: 6px; padding: 2px; flex: none; }
.sd-seg > * { padding: 3px 7px; border-radius: 5px; font-size: 9px; font-weight: 500; }
.sd-seg b { background: #fff; box-shadow: 0 1px 2px rgba(0, 0, 0, .1); color: var(--n-text); }
.sd-locktip b { color: var(--n-text); }
.sd-page h4 { font: 700 17px/1.25 var(--n-font); margin: 0 0 4px; }
.sd-meta { display: flex; justify-content: space-between; font-size: 8.5px; color: var(--n-faint); margin-bottom: 10px; }
.sd-page p { font: 12.5px/2 var(--n-content-font); margin: 0 0 8px; }
.sd-pink { background: rgba(255, 105, 180, .25); }
.sd-yel { background: rgba(255, 212, 0, .38); }
.sd-ul { text-decoration: underline; text-decoration-color: #e5401b; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.sd-w { border-radius: 2px; transition: background .2s; }
.sd-w.looked { border-bottom: 1.2px dashed rgba(51, 126, 169, .7); }
.sd-w.sel { background: rgba(80, 160, 255, .3); }

/* 查词卡片（和网站上真实的卡片一样，等比例缩小） */
.sd-pop { position: absolute; z-index: 2; width: 250px; background: #fff; border-radius: 9px; box-shadow: 0 8px 26px rgba(15, 15, 15, .18), 0 0 0 1px rgba(15, 15, 15, .05);
  opacity: 0; transform: translateY(-4px) scale(.97); transform-origin: top left; transition: opacity .2s, transform .2s; pointer-events: none; font-family: var(--n-font); }
.sd-pop.on { opacity: 1; transform: none; }
.sd-ptools { display: flex; align-items: center; gap: 4px; padding: 6px 9px; border-bottom: 1px solid var(--n-line); font-size: 9.5px; color: var(--n-text); }
.sd-ptools i { width: 13px; height: 13px; border-radius: 50%; border: 1.5px solid #fff; box-shadow: 0 0 0 1px #ddd; }
.sd-ptools .y { background: #ffd43b; } .sd-ptools .g { background: #69c97b; } .sd-ptools .b { background: #5aa6ff; } .sd-ptools .p { background: #f17cba; }
.sd-ptools .u { font: 700 8px/13px var(--n-font); text-align: center; color: #e5401b; text-decoration: underline; font-style: normal; background: #fff; }
.sd-sep { width: 1px; height: 12px; background: #e3e3e3; margin: 0 3px; }
.sd-unmark { color: #e0533b; margin-left: auto; }
.sd-pbody { padding: 7px 10px 6px; }
.sd-pw { font-size: 14px; color: #2a3c9e; }
.sd-pw small { font-size: 9.5px; color: var(--n-muted); } .sd-pw i { font-style: normal; font-size: 9px; }
.sd-ptags { display: flex; flex-wrap: wrap; gap: 3px; margin: 4px 0; }
.sd-ptags span { font-size: 8px; background: #fbf1dc; color: #8a5a12; border-radius: 3px; padding: 1px 4px; }
.sd-pd { font-size: 10px; line-height: 1.55; margin-bottom: 6px; }
.sd-pbtns { display: flex; align-items: center; gap: 7px; }
.sd-eudic { background: #3b6fe0; color: #fff; font-size: 9.5px; font-weight: 600; border-radius: 5px; padding: 4px 8px; transition: transform .12s, filter .12s; }
.sd-eudic.press { transform: scale(.93); filter: brightness(.88); }
.sd-plink { font-size: 8.5px; color: var(--n-muted); }
.sd-pnote { font-size: 7.5px; color: var(--n-faint); margin-top: 5px; line-height: 1.6; }
.sd-pai { display: flex; gap: 6px; border-top: 1px solid var(--n-line); padding: 6px 10px 7px; }
.sd-pai span { font-size: 9px; border-radius: 5px; padding: 3px 7px; }
.sd-pai .ds { background: #f2f5ff; color: #3554d1; border: 1px solid rgba(77, 107, 254, .35); }
.sd-pai .db { background: #effaf7; color: #0b7a6c; border: 1px solid rgba(0, 150, 136, .35); }

/* ---- 右边：欧路词典（牛津高阶英汉双解） ---- */
.sd-right { background: #fff; }
.sd-eu { display: flex; height: 100%; }
.sd-elist { display: none; width: 38%; flex: none; border-right: 1px solid #ececf0; padding-top: 8px; overflow: hidden; }
.sd-device.mac .sd-elist { display: block; }
.sd-device.mac .sd-search2 { display: none; }
.sd-emain { position: relative; flex: 1; min-width: 0; overflow: hidden; background: linear-gradient(#f3f7fe, #fff 70px); padding-top: 8px; }
.sd-search { display: flex; align-items: center; height: 26px; background: #fff; border: 1.5px solid #3b82f6; border-radius: 7px; padding: 0 8px; font-size: 12px; color: #111; margin: 0 8px 6px; }
.sd-search em { margin-left: auto; font-style: normal; font-size: 9px; opacity: .6; }
.sd-caret { width: 1px; height: 13px; background: #3b82f6; margin-left: 1px; animation: sd-blink 1s steps(1) infinite; }
@keyframes sd-blink { 50% { opacity: 0; } }
.sd-ltitle { font-size: 8.5px; font-weight: 600; color: #8b8b92; padding: 2px 9px 3px; }
.sd-litems { opacity: 0; transition: opacity .3s; }
.sd-litems.on { opacity: 1; }
.sd-litems div { padding: 4px 9px; }
.sd-litems div.on { background: #eef3fd; }
.sd-litems b { display: block; font-size: 10.5px; font-weight: 500; color: #111; }
.sd-litems span { display: block; font-size: 8.5px; color: #8b8b92; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sd-etabs { display: flex; gap: 2px; margin: 0 8px 4px; font-size: 9px; color: #9aa3b2; }
.sd-etabs > * { flex: 1; text-align: center; padding: 3px 0; background: #e9eef8; border-radius: 4px; font-weight: 500; }
.sd-etabs b { background: #fff; color: #111; }
.sd-entry { opacity: 0; transform: translateY(6px); transition: opacity .35s, transform .35s; }
.sd-entry.on { opacity: 1; transform: none; }
.sd-ehead { display: flex; justify-content: space-between; align-items: baseline; padding: 4px 11px 0; }
.sd-ehead b { font: 700 19px var(--n-font); color: #111; }
.sd-ehead span { font-size: 13px; color: #333; }
.sd-eph { display: flex; gap: 8px; flex-wrap: wrap; font-size: 9.5px; color: #333; padding: 2px 11px 0; }
.sd-eph i { font-style: normal; color: #3b82f6; margin-right: 2px; font-size: 8px; }
.sd-wide { display: none; }
.sd-device.mac .sd-wide { display: inline; }
.sd-tags { padding: 4px 11px 6px; display: flex; gap: 4px; }
.sd-tags span { font-size: 7.5px; color: #888; border: 1px solid #d6d6d6; border-radius: 3px; padding: 0 3px; line-height: 13px; }
.sd-dict { display: flex; justify-content: space-between; background: #f1f2f5; font-size: 9.5px; color: #333; padding: 5px 11px; margin-top: 2px; }
.sd-dict span { color: #aaa; font-size: 8px; }
.sd-ox { padding: 6px 11px 0; font-size: 10px; }
.sd-syl { color: #1a73d9; font-size: 15px; }
.sd-right em { color: #ef5a1f; font-style: normal; font-size: 9px; }
.sd-ox .uk { color: #1a4fb5; } .sd-ox .us { color: #a8361c; }
.sd-ox i { font-style: normal; font-size: 7px; }
.sd-pos { margin: 3px 11px 3px; border-bottom: 1.5px solid #1a73d9; }
.sd-pos span { display: inline-block; background: #1a73d9; color: #fff; font: 700 8.5px var(--n-font); padding: 2px 7px; border-radius: 6px 6px 0 0; letter-spacing: .03em; }
.sd-sense { font-size: 10px; line-height: 1.5; color: #111; padding: 2px 11px; }
.sd-sense b { color: #1a73d9; }
.sd-phr { font-size: 9.5px; color: #1a4fb5; padding: 1px 11px 6px 20px; line-height: 1.5; }
.sd-phr b { display: block; color: #1a3e9a; }
.sd-exm { display: flex; gap: 6px; font-size: 10px; color: #111; padding: 6px 11px 2px; line-height: 1.45; }
.sd-exm > b { color: #999; font-weight: 400; }
.sd-exm u { text-decoration: none; color: #1a73d9; }
.sd-exm small { display: block; color: #555; font-size: 9px; margin-top: 2px; }
.sd-empty { position: absolute; left: 0; right: 0; top: 46%; text-align: center; font-size: 11px; color: var(--n-faint); }
.sd-empty[hidden] { display: none; }

/* 指针：平板是半透明的手指圆点，电脑是鼠标箭头 */
.sd-pointer { position: absolute; left: 0; top: 0; z-index: 3; pointer-events: none; transform: translate(260px, 330px); transition: transform .7s cubic-bezier(.4, 0, .2, 1); }
.sd-device.ipad .sd-pointer::before { content: ""; position: absolute; left: -13px; top: -13px; width: 26px; height: 26px; border-radius: 50%; background: rgba(60, 60, 67, .28); border: 2px solid rgba(255, 255, 255, .85); box-shadow: 0 2px 6px rgba(0, 0, 0, .18); transition: transform .15s; }
.sd-device.ipad .sd-pointer.tap::before { transform: scale(.75); background: rgba(60, 60, 67, .42); }
.sd-device.mac .sd-pointer::before { content: ""; position: absolute; left: -2px; top: -2px; width: 16px; height: 22px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 22'%3E%3Cpath d='M1 1v17l4.5-4.2 3 6.7 2.6-1.2-3-6.6H14z' fill='%23111' stroke='%23fff' stroke-width='1.3' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat; transition: transform .15s; }
.sd-device.mac .sd-pointer.tap::before { transform: scale(.85); }

/* ---------- 点词查义 + 问 AI 的演示（lookup-demo.js）：浏览器窗口里的阅读空间，卡片用网站真实的样式 ---------- */
.ld-stage { padding: 4px 0 40px; margin-bottom: -16px; min-width: 0; overflow-x: clip; }
.ld-win { position: relative; width: 640px; margin: 0 auto; background: #fff; border-radius: 12px; overflow: hidden; text-align: left;
  box-shadow: 0 18px 40px rgba(0, 0, 0, .12), 0 0 0 1px rgba(0, 0, 0, .06); }
.ld-lights { display: inline-flex; }
.ld-page { position: relative; height: 470px; padding: 22px 30px; overflow: hidden; color: var(--n-text); }
.ld-page h4 { font: 700 22px/1.3 var(--n-font); margin: 0 0 14px; }
.ld-page p { font: 15px/2 var(--n-content-font); margin: 0 0 12px; }
.ld-w { border-radius: 2px; transition: background .2s; }
.ld-w.looked { border-bottom: 1.5px dashed rgba(51, 126, 169, .7); }
.ld-w.sel { background: rgba(80, 160, 255, .3); }
.ld .u-pop.ld-pop { position: absolute; z-index: 2; width: 340px; max-width: none; max-height: 330px; overflow: hidden; animation: none;
  opacity: 0; transform: translateY(-4px) scale(.98); transform-origin: top left; transition: opacity .2s, transform .2s; pointer-events: none; }
.ld .u-pop.ld-pop.on { opacity: 1; transform: none; }
.ld .u-ai-btn.press { transform: scale(.94); filter: brightness(.92); }
.ld-ptr { position: absolute; left: 0; top: 0; z-index: 3; pointer-events: none; transform: translate(420px, 380px); transition: transform .7s cubic-bezier(.4, 0, .2, 1); }
.ld-ptr::before { content: ""; position: absolute; left: -2px; top: -2px; width: 16px; height: 22px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 22'%3E%3Cpath d='M1 1v17l4.5-4.2 3 6.7 2.6-1.2-3-6.6H14z' fill='%23111' stroke='%23fff' stroke-width='1.3' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat; transition: transform .15s; }
.ld-ptr.tap::before { transform: scale(.85); }

/* ---------- 阅读空间全流程演示（flow-demo.js）：粘贴 / 上传 → 目录 → 查词 → 问 AI → 欧路分屏 ---------- */
.fd-steps { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin: 0 0 18px; }
.fd-steps button { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--n-line); background: #fff; border-radius: 980px; padding: 5px 12px 5px 6px; font: 500 13px var(--n-font); color: var(--n-muted); cursor: pointer; transition: all .2s; }
.fd-steps button i { width: 18px; height: 18px; border-radius: 50%; background: rgb(241, 241, 239); font: 600 11px/18px var(--n-font); font-style: normal; text-align: center; }
.fd-steps button.on { border-color: #3554d1; color: #3554d1; background: #f2f5ff; }
.fd-steps button.on i { background: #3554d1; color: #fff; }
.fd-stage { padding: 4px 0 40px; margin-bottom: -16px; min-width: 0; overflow-x: clip; }
.fd-win { position: relative; width: 760px; margin: 0 auto; background: #fff; border-radius: 12px; overflow: hidden; text-align: left;
  box-shadow: 0 18px 40px rgba(0, 0, 0, .12), 0 0 0 1px rgba(0, 0, 0, .06); }
.fd-body { display: grid; grid-template-columns: 1fr 0 0fr; height: 470px; transition: grid-template-columns .7s cubic-bezier(.4, 0, .2, 1); }
.fd-body.split { grid-template-columns: 1.2fr 5px 1fr; }
.fd-reader, .fd-eu { position: relative; overflow: hidden; min-width: 0; }
.fd-split { overflow: hidden; }
.fd-scene { position: absolute; inset: 0; padding: 18px 28px; opacity: 0; transition: opacity .35s; color: var(--n-text); }
.fd-scene.on { opacity: 1; z-index: 1; }

/* 新文章：粘贴 / 上传 */
.fd-tabs { display: inline-flex; gap: 2px; padding: 3px; background: var(--n-gray-bg, #f1f1ef); border-radius: 9px; margin-bottom: 14px; font-size: 13px; }
.fd-tabs span { padding: 5px 12px; border-radius: 7px; color: var(--n-muted); transition: all .2s; }
.fd-tabs span.press { transform: scale(.95); }
.fd-new:not(.up) .fd-tab-paste, .fd-new.up .fd-tab-up { background: #fff; color: var(--n-text); font-weight: 600; box-shadow: 0 1px 3px rgba(15, 15, 15, .12); }
.fd-h { font: 700 22px var(--n-font); margin-bottom: 10px; }
.fd-ta { position: relative; height: 220px; border: 1px solid var(--n-line); border-radius: 8px; padding: 10px 14px; transition: border-color .2s, box-shadow .2s; }
.fd-ta.press, .fd-new.pasted .fd-ta { border-color: rgba(35, 131, 226, .6); box-shadow: 0 0 0 3px rgba(35, 131, 226, .12); }
.fd-ph { color: var(--n-faint); font: 15px var(--n-content-font); }
.fd-txt { display: none; font: 14px/1.8 var(--n-content-font); }
.fd-txt p { margin: 0 0 8px; }
.fd-new.pasted .fd-ph { display: none; }
.fd-new.pasted .fd-txt { display: block; animation: fd-flash .6s; }
@keyframes fd-flash { from { background: rgba(80, 160, 255, .25); } }
.fd-key { position: absolute; right: 14px; top: -14px; background: #1d1d1f; color: #fff; font: 600 13px var(--n-font); padding: 5px 10px; border-radius: 7px; opacity: 0; transform: translateY(6px); transition: all .2s; }
.fd-key.on { opacity: 1; transform: none; }
.fd-upload { display: none; }
.fd-new.up .fd-paste { display: none; }
.fd-new.up .fd-upload { display: block; }
.fd-drop { display: flex; flex-direction: column; align-items: center; gap: 3px; border: 2px dashed var(--n-line); border-radius: 12px; padding: 30px 16px; font-size: 13px; color: var(--n-muted); transition: all .2s; }
.fd-drop span { font-size: 28px; } .fd-drop b { color: var(--n-text); font-size: 15px; } .fd-drop small { color: var(--n-faint); font-size: 11px; margin-top: 4px; }
.fd-new.drag .fd-drop { border-color: rgba(35, 131, 226, .6); background: #f5f9fe; }
.fd-new.preview .fd-drop { display: none; }
.fd-prev { display: none; border: 1px solid var(--n-line); border-radius: 12px; padding: 12px 14px; }
.fd-new.preview .fd-prev { display: block; animation: fd-in .35s; }
@keyframes fd-in { from { opacity: 0; transform: translateY(6px); } }
.fd-ptitle { border: 1px solid var(--n-line); border-radius: 8px; padding: 6px 10px; font: 15px var(--n-content-font); }
.fd-pinfo { color: var(--n-muted); font-size: 12px; margin: 8px 2px; }
.fd-ptoc { background: var(--n-side, #f7f7f5); border-radius: 8px; padding: 8px 12px; font-size: 12px; color: var(--n-muted); line-height: 1.75; }
.fd-ptoc b { color: var(--n-text); display: block; } .fd-ptoc .more { color: var(--n-faint); }
.fd-save { position: absolute; right: 28px; bottom: 60px; background: #2a3c9e; color: #fff; font: 600 13px var(--n-font); padding: 8px 16px; border-radius: 980px; transition: transform .12s, filter .12s; }
.fd-save.press { transform: scale(.94); filter: brightness(.88); }
.fd-file { position: absolute; left: 100%; top: 72%; display: flex; align-items: center; gap: 8px; background: #fff; border-radius: 10px; padding: 8px 12px; font-size: 12px; box-shadow: 0 8px 22px rgba(0, 0, 0, .18);
  transition: left .9s cubic-bezier(.4, 0, .2, 1), top .9s cubic-bezier(.4, 0, .2, 1), opacity .3s; opacity: 0; }
.fd-file span { background: #e5401b; color: #fff; font: 700 10px var(--n-font); padding: 4px 5px; border-radius: 4px; }
.fd-new.drag .fd-file { left: 34%; top: 32%; opacity: 1; }
.fd-new.dropped .fd-file { opacity: 0; transform: scale(.8); }

/* 阅读：章节条、目录、正文 */
.fd-read { padding-top: 0; }
.fd-bar { display: flex; align-items: center; gap: 10px; margin: 0 -28px 16px; padding: 9px 28px; border-bottom: 1px solid var(--n-line); font-size: 12.5px; }
.fd-tocbtn { border: 1px solid var(--n-line); border-radius: 7px; padding: 4px 10px; transition: transform .12s; }
.fd-tocbtn.press { transform: scale(.94); background: var(--n-hover, #efefed); }
.fd-cur { flex: 1; color: var(--n-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fd-num { color: var(--n-faint); font-size: 12px; white-space: pre; }
.fd-toc { position: absolute; left: 24px; top: 44px; z-index: 2; width: 270px; background: #fff; border-radius: 10px; padding: 8px 6px; font-size: 13px;
  box-shadow: 0 0 0 1px rgba(15,15,15,.05), 0 3px 6px rgba(15,15,15,.1), 0 9px 24px rgba(15,15,15,.2); opacity: 0; transform: translateY(-4px); transition: all .2s; pointer-events: none; }
.fd-toc.on { opacity: 1; transform: none; }
.fd-toc b { display: block; padding: 2px 8px 6px; }
.fd-toc div { padding: 6px 8px; border-radius: 6px; }
.fd-toc div.on { background: #e8f1fd; color: #1f5fbf; font-weight: 600; }
.fd-toc div.press { background: var(--n-hover, #efefed); }
.fd-article h4 { font: 700 22px/1.3 var(--n-font); margin: 0 0 12px; }
.fd-article p { font: 15px/2 var(--n-content-font); margin: 0 0 12px; }
.fd-w { border-radius: 2px; transition: background .2s; }
.fd-w.looked { border-bottom: 1.5px dashed rgba(51, 126, 169, .7); }
.fd-w.sel { background: rgba(80, 160, 255, .3); }
.fd .u-pop.fd-pop { position: absolute; z-index: 2; width: 340px; max-width: none; max-height: 300px; overflow: hidden; animation: none;
  opacity: 0; transform: translateY(-4px) scale(.98); transform-origin: top left; transition: opacity .2s, transform .2s; pointer-events: none; }
.fd .u-pop.fd-pop.on { opacity: 1; transform: none; }
.fd .fd-aibtn.press, .fd .fd-eudic.press { transform: scale(.94); filter: brightness(.92); }
.fd-eu .sd-emain { height: 100%; }
/* 划线、批注 */
.fd-article mark.fd-m { background: none; color: inherit; border-radius: 2px; transition: background .25s; }
.fd-article mark.fd-m.sel { background: rgba(80, 160, 255, .3); }
.fd-article mark.u-yellow { background: rgba(255, 212, 0, .38); }
.fd-article mark.u-underline { background: none; text-decoration: underline; text-decoration-color: #e5401b; text-decoration-thickness: 2px; text-underline-offset: 4px; }
.fd-article mark.u-comment { background: rgba(255, 212, 0, .14); border-bottom: 2px solid rgba(255, 191, 0, .8); }
.fd .u-pop.fd-tools { position: absolute; z-index: 2; max-width: none; animation: none; opacity: 0; transform: translateY(4px); transition: opacity .2s, transform .2s; pointer-events: none; }
.fd .u-pop.fd-tools.on { opacity: 1; transform: none; }
.fd .fd-tools .u-edit textarea { width: 100%; box-sizing: border-box; font-size: 13px; min-height: 56px; }
.fd .fd-tools .press { transform: scale(.88); filter: brightness(.92); }
.fd-note { position: absolute; right: 6px; z-index: 1; font-size: 14px; opacity: 0; transform: scale(.6); transition: all .25s; }
.fd-note.on { opacity: .8; transform: none; }

/* 底部的说明文字 */
.fd-cap { position: absolute; left: 50%; bottom: 14px; z-index: 4; transform: translate(-50%, 6px); max-width: 88%; background: rgba(29, 29, 31, .88); color: #fff; font: 500 13px/1.5 var(--n-font);
  padding: 7px 14px; border-radius: 9px; opacity: 0; transition: opacity .3s, transform .3s; text-align: center; white-space: nowrap; }
.fd-cap.on { opacity: 1; transform: translate(-50%, 0); }
.fd-ptr { z-index: 5; }