/* §03 Agent 工作台（3.3）：一篇文章从一句需求到被搜到。
   滚动驱动：章节钉住，js/demos/flow.js 只写 --p（0 → 5，五步）与几个离散状态（当前画面、已发送、已确认）；
   各元素按自己的 --at 由 --p 算出显现程度 --k，所以往回滑就倒着播放。
   减少动态、无 JS、或视口矮于 520px：不钉住，五步与三个画面并排成静态分镜（--p 视为 5，全部显示完成状态）。 */

.flow { --p: 5; position: relative; }
.flow [style*="--at"] { --k: clamp(0, calc((var(--p) - var(--at)) * 9), 1); }

/* ------------------------------------------------------------ the steps */
.flow-side { display: grid; align-content: start; gap: 18px; }
.flow-dock { display: flex; align-items: center; gap: 16px; }
.flow-dock .paper-dock { --w: 58px; }
.flow-dock p { font: 500 clamp(17px, 1.4vw, 21px)/1.4 var(--serif); color: var(--text-1); }
.flow-steps { display: grid; gap: 4px; counter-reset: none; }
.flow-steps button {
  position: relative; display: grid; grid-template-columns: 34px minmax(0, 1fr); column-gap: 10px; row-gap: 3px;
  width: 100%; padding: 12px 14px 14px; border-radius: 14px; text-align: left; overflow: hidden;
  color: var(--text-3); transition: color var(--t-base), background var(--t-base);
}
.flow-steps b { grid-row: 1 / 3; font: 500 12px/22px var(--mono); color: var(--text-4); }
.fs-title { font-size: 16px; font-weight: 500; color: inherit; }
.fs-note { grid-column: 2; font-size: 13px; line-height: 1.55; color: var(--text-3); }
.fs-fill { position: absolute; left: 14px; right: 14px; bottom: 6px; height: 2px; border-radius: 2px; background: var(--hair); overflow: hidden; }
.fs-fill::after {
  content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--blue), var(--blue-soft));
  transform-origin: left; transform: scaleX(clamp(0, calc(var(--p) - var(--i)), 1));
}
.flow-steps button:hover { color: var(--text-1); }
.flow-steps button[aria-current="step"] { color: var(--text-1); background: rgba(36, 111, 241, 0.12); }
.flow-steps button[aria-current="step"] b { color: var(--blue-soft); }
.flow-caption { display: none; }

/* -------------------------------------------------------------- the app */
.flow-app {
  position: relative; display: grid; grid-template-rows: auto minmax(0, 1fr); min-width: 0;
  border-radius: 22px; overflow: hidden; background: var(--paper); color: var(--paper-ink);
  box-shadow: var(--shadow-lift), 0 0 0 1px rgba(255, 255, 255, 0.06);
}
.fa-bar { display: flex; align-items: center; gap: 12px; height: 44px; padding: 0 16px; border-bottom: 1px solid var(--paper-line); background: #e8eef6; font-size: 13px; }
.fa-lights { display: flex; gap: 6px; } .fa-lights i { width: 10px; height: 10px; border-radius: 50%; background: #c7d3e2; }
.fa-title { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; font-weight: 600; color: var(--paper-ink); }
.fa-name { display: none; white-space: nowrap; }
.fa-badge { padding: 3px 9px; border-radius: 99px; background: rgba(36, 111, 241, 0.1); color: #1f4f9e; font: 500 11px/1.4 var(--mono); }
.fa-badge a { color: inherit; }
.fa-screens { position: relative; min-height: 0; }
.fa-screen { padding: 18px 20px; min-height: 0; overflow: hidden; }

/* reveal helpers */
.fa-tools li, .fa-draft, .fa-review, .fa-sending, .fp-new, .fp-seo, .fp-seo i, .fq-result, .fq-ai, .fq-cite {
  opacity: var(--k, 1); transform: translateY(calc((1 - var(--k, 1)) * 10px));
}
.fa-line { clip-path: inset(0 calc((1 - var(--k, 1)) * 100%) 0 0); }
.fa-caret { display: none; }

/* 01–03 chat */
.fa-chat { display: grid; align-content: start; gap: 14px; }
.fa-day { text-align: center; font: 500 11px/1 var(--mono); letter-spacing: 0.08em; color: var(--paper-ink-3); }
.fa-user { display: flex; justify-content: flex-end; }
.fa-bubble { max-width: 86%; padding: 11px 14px; border-radius: 16px 16px 4px 16px; background: var(--paper-ink); color: #f2f6fb; font-size: 14px; line-height: 1.6; }
.fa-agent { display: grid; gap: 10px; }
.fa-who { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.fa-who small { padding: 2px 8px; border-radius: 99px; background: rgba(36, 111, 241, 0.1); color: #1f4f9e; font-size: 11px; }
.fa-tools { display: flex; flex-wrap: wrap; gap: 6px; }
.fa-tools li { display: inline-flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: 99px; background: #e2e9f3; font-size: 12px; color: var(--paper-ink-2); }
.fa-tools li i { width: 14px; height: 14px; border-radius: 50%; background: var(--blue); -webkit-mask: radial-gradient(circle, #000 0 3px, transparent 3.5px); mask: radial-gradient(circle, #000 0 3px, transparent 3.5px); }
.fa-draft { display: grid; gap: 7px; padding: 14px 16px 12px; border-radius: 14px; background: #fff; border: 1px solid var(--paper-line); box-shadow: 0 14px 30px -20px rgba(14, 31, 58, 0.45); }
.fa-draft small { font: 500 11px/1 var(--mono); letter-spacing: 0.06em; color: var(--paper-ink-3); }
.fa-draft h4 { font: 600 16px/1.45 var(--serif); color: var(--paper-ink); }
.fa-draft p { display: flex; gap: 8px; font-size: 13.5px; line-height: 1.5; color: var(--paper-ink-2); }
.fa-draft p b { flex: none; display: grid; place-items: center; width: 20px; height: 20px; border-radius: 6px; background: rgba(36, 111, 241, 0.12); color: var(--blue); font-size: 12px; }
.fa-review { display: flex; align-items: center; gap: 8px; margin-top: 4px; padding-top: 10px; border-top: 1px dashed var(--paper-line); }
.fa-state { flex: 1; font-size: 12px; color: var(--paper-ink-3); }
.fa-ok { display: none; color: #1b7a4a; font-weight: 600; }
.fa-btn { padding: 6px 12px; border-radius: 99px; border: 1px solid var(--paper-line); font-size: 12px; color: var(--paper-ink-2); transition: background 0.25s, color 0.25s, border-color 0.25s, transform 0.25s; }
.fa-go { border-color: var(--blue); color: var(--blue); }
[data-flow-confirmed] .fa-go { background: var(--blue); color: #fff; transform: scale(0.96); }
[data-flow-confirmed] .fa-wait { display: none; }
[data-flow-confirmed] .fa-ok { display: inline; }
.fa-sending { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--paper-ink-3); }
.fa-sending i { width: 60px; height: 3px; border-radius: 3px; background: linear-gradient(90deg, var(--blue) calc(var(--k, 1) * 100%), #d6e0ec 0); }

/* 04 brand page */
.fa-page { display: grid; align-content: start; gap: 14px; }
.fp-head { display: flex; align-items: center; gap: 12px; padding-bottom: 14px; border-bottom: 1px solid var(--paper-line); }
.fp-avatar { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, #4c8bff, #1847b8); color: #fff; font: 500 20px/1 var(--serif); }
.fp-head p { flex: 1; display: grid; gap: 2px; } .fp-head b { font: 600 17px/1.3 var(--serif); } .fp-head small { font-size: 12px; color: var(--paper-ink-3); }
.fp-ask { padding: 6px 14px; border-radius: 99px; background: var(--blue); color: #fff; font-size: 12px; }
.fp-tabs { display: flex; gap: 18px; font-size: 13px; color: var(--paper-ink-3); }
.fp-tabs .is-on { color: var(--paper-ink); font-weight: 600; box-shadow: 0 2px 0 var(--blue); }
.fp-list { display: grid; gap: 8px; }
.fp-list li { display: grid; gap: 3px; padding: 12px 14px; border-radius: 12px; background: #fff; border: 1px solid var(--paper-line); }
.fp-list b { font: 600 14px/1.45 var(--serif); } .fp-list small { font-size: 11.5px; color: var(--paper-ink-3); }
.fp-list li:not(.fp-new) { opacity: 0.72; }
.fp-new { border-color: rgba(36, 111, 241, 0.45) !important; box-shadow: 0 0 0 3px rgba(36, 111, 241, 0.1); }
.fp-new em { justify-self: start; padding: 1px 8px; border-radius: 99px; background: var(--blue); color: #fff; font-style: normal; font-size: 11px; }
.fp-seo { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 12px; }
.fp-seo span { font: 600 11px/1 var(--mono); letter-spacing: 0.04em; color: var(--blue); margin-right: 4px; }
.fp-seo i { font-style: normal; padding: 4px 10px; border-radius: 99px; background: rgba(27, 122, 74, 0.1); color: #1b7a4a; }
.fp-seo i::before { content: "✓ "; }

/* 05 found and cited */
.fa-search { display: grid; align-content: start; gap: 12px; }
.fq-box { display: flex; align-items: center; gap: 10px; padding: 11px 16px; border-radius: 99px; background: #fff; border: 1px solid var(--paper-line); font-size: 14px; box-shadow: 0 10px 24px -18px rgba(14, 31, 58, 0.5); }
.fq-box svg { width: 17px; height: 17px; fill: none; stroke: var(--paper-ink-3); stroke-width: 1.7; }
.fq-result { display: grid; gap: 4px; padding: 12px 14px; border-radius: 12px; background: #fff; border: 1px solid rgba(36, 111, 241, 0.45); box-shadow: 0 0 0 3px rgba(36, 111, 241, 0.08); }
.fq-site { display: flex; align-items: center; gap: 6px; font-size: 11.5px; color: var(--paper-ink-3); }
.fq-site span { display: grid; place-items: center; width: 18px; height: 18px; border-radius: 50%; background: var(--blue); color: #fff; font-size: 10px; }
.fq-result b { font: 600 14.5px/1.45 var(--serif); color: #1847b8; }
.fq-result small { font-size: 12px; line-height: 1.5; color: var(--paper-ink-2); }
.fq-ai { display: grid; gap: 3px; padding: 12px 14px; border-radius: 12px; background: linear-gradient(135deg, #eaf1fd, #f6f9fd); border: 1px solid #d3e1f6; font-size: 13px; line-height: 1.6; color: var(--paper-ink-2); }
.fq-ai-head { display: flex; align-items: center; gap: 6px; margin-bottom: 2px; font-size: 12px; font-weight: 600; color: var(--paper-ink); }
.fq-ai-head svg { width: 15px; height: 15px; fill: none; stroke: var(--blue); stroke-width: 1.5; }
.fq-cite { display: inline-flex; justify-self: start; align-items: center; gap: 6px; margin-top: 6px; padding: 3px 10px 3px 4px; border-radius: 99px; background: #fff; border: 1px solid rgba(36, 111, 241, 0.4); font-size: 11.5px; color: #1847b8; }
.fq-cite span { padding: 1px 6px; border-radius: 99px; background: var(--blue); color: #fff; font-size: 10.5px; }
.fq-note { font-size: 11px; color: var(--paper-ink-3); text-align: center; }

.flow-note { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; margin-top: 14px; font-size: 12.5px; color: var(--text-3); }
.flow-note a { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; color: var(--blue-soft); }
.flow-note svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.6; }

/* ------------------------------------------------------- the review dock */
.paper-review {
  display: flex; align-items: center; justify-content: space-between; gap: 28px; margin-top: clamp(24px, 4vw, 48px); padding: 24px 32px 24px 34px;
  border-radius: var(--r-l); background: var(--paper-2); color: var(--paper-ink); box-shadow: var(--shadow-lift);
}
.paper-review p { font: 500 clamp(19px, 1.6vw, 24px)/1.4 var(--serif); }
.paper-review small { display: block; margin-top: 4px; font-size: 13px; color: var(--paper-ink-3); }
.paper-review .paper-dock { --w: 72px; }
.paper-review .paper-slot path { stroke: var(--blue); }
.paper-review .paper-dock::after { background: var(--blue); }

/* ----------------------------------------------- static: a storyboard */
.flow:not([data-flow-live]) .flow-stage { display: grid; gap: clamp(24px, 3vw, 40px); margin-top: clamp(32px, 4vw, 56px); }
.flow:not([data-flow-live]) .flow-steps { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.flow:not([data-flow-live]) .flow-app { grid-template-rows: auto auto; }
.flow:not([data-flow-live]) .fa-screens { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.flow:not([data-flow-live]) .fa-screen + .fa-screen { border-left: 1px solid var(--paper-line); }
.flow:not([data-flow-live]) .fa-screen::before { content: attr(aria-label); display: block; margin-bottom: 4px; font: 500 11px/1.4 var(--mono); letter-spacing: 0.06em; color: var(--blue); }
.flow:not([data-flow-live]) .fa-name[data-screen-name="chat"] { display: inline; }
@media (max-width: 900px) {
  .flow:not([data-flow-live]) .flow-steps { grid-template-columns: 1fr; }
  .flow:not([data-flow-live]) .fa-screens { grid-template-columns: 1fr; }
  .flow:not([data-flow-live]) .fa-screen + .fa-screen { border-left: 0; border-top: 1px solid var(--paper-line); }
}

/* ------------------------------------------------- live: pinned runway */
[data-flow-live].flow { --runway: 3.2; height: calc(100svh * (1 + var(--runway))); margin-top: clamp(16px, 2vw, 28px); }
[data-flow-live] .flow-stage {
  position: sticky; top: 0; height: 100svh; display: grid;
  grid-template-columns: minmax(250px, 330px) minmax(0, 1fr); align-items: center; gap: clamp(28px, 4vw, 64px);
  padding: calc(var(--header) + 18px) 0 22px;
}
[data-flow-live] .flow-app { height: min(640px, calc(100svh - var(--header) - 60px)); }
[data-flow-live] .fa-screen { position: absolute; inset: 0; opacity: 0; visibility: hidden; transform: translateY(14px); transition: opacity 0.35s var(--ease-out), transform 0.45s var(--ease-out), visibility 0s linear 0.35s; }
[data-flow-live] .flow-stage[data-screen="chat"] .fa-chat,
[data-flow-live] .flow-stage[data-screen="page"] .fa-page,
[data-flow-live] .flow-stage[data-screen="search"] .fa-search { opacity: 1; visibility: visible; transform: none; transition: opacity 0.35s var(--ease-out), transform 0.45s var(--ease-out), visibility 0s; }
[data-flow-live] .flow-stage[data-screen="chat"] .fa-name[data-screen-name="chat"],
[data-flow-live] .flow-stage[data-screen="page"] .fa-name[data-screen-name="page"],
[data-flow-live] .flow-stage[data-screen="search"] .fa-name[data-screen-name="search"] { display: inline; }
[data-flow-live] .fa-chat { justify-content: stretch; }
/* the request types itself, then is sent */
[data-flow-live] .flow-stage:not([data-flow-sent]) .fa-bubble { background: transparent; color: var(--paper-ink); box-shadow: inset 0 0 0 1px var(--paper-line); }
[data-flow-live] .flow-stage[data-flow-typing="ask"] .fa-bubble .fa-caret,
[data-flow-live] .flow-stage[data-flow-typing="query"] .fq-box .fa-caret { display: inline-block; width: 2px; height: 1.1em; margin-left: 2px; vertical-align: -0.18em; background: var(--blue); animation: fa-blink 1s steps(1) infinite; }
@keyframes fa-blink { 50% { opacity: 0; } }
[data-flow-live] .fa-agent { opacity: clamp(0, calc((var(--p) - 0.86) * 8), 1); }
/* the press on 确认发布 */
[data-flow-live] .fa-go { box-shadow: 0 0 0 calc(clamp(0, calc((var(--p) - 2.2) * 4), 1) * 6px) rgba(36, 111, 241, 0.16); }

/* --------------------------------------------- wide screens: bigger print */
@media (min-width: 761px) {
  [data-flow-live] .flow-app { width: 100%; max-width: 720px; justify-self: center; height: min(600px, calc(100svh - var(--header) - 70px)); }
  .fa-screen { padding: 24px 30px; }
  .fa-chat, .fa-page, .fa-search { gap: 16px; }
  .fa-bubble { font-size: 15.5px; padding: 13px 17px; }
  .fa-who { font-size: 14px; }
  .fa-tools li { font-size: 13px; padding: 6px 12px; }
  .fa-draft { gap: 9px; padding: 18px 20px 14px; }
  .fa-draft h4 { font-size: 20px; }
  .fa-draft p { font-size: 15px; }
  .fa-draft p b { width: 22px; height: 22px; }
  .fa-btn { font-size: 13px; padding: 7px 14px; }
  .fp-avatar { width: 52px; height: 52px; font-size: 23px; }
  .fp-head b { font-size: 19px; } .fp-head small { font-size: 13px; }
  .fp-list li { padding: 14px 16px; } .fp-list b { font-size: 16px; } .fp-list small { font-size: 12.5px; }
  .fp-seo { font-size: 13px; }
  .fq-box { font-size: 15.5px; padding: 13px 18px; }
  .fq-result { padding: 14px 16px; } .fq-result b { font-size: 17px; } .fq-result small { font-size: 13.5px; }
  .fq-ai { font-size: 14.5px; padding: 14px 16px; }
  .fq-cite { font-size: 12.5px; }
}

/* ----------------------------------------------------------- phones */
@media (max-width: 760px) {
  .paper-review { padding: 20px 20px 20px 22px; gap: 16px; }
  .paper-review .paper-dock { --w: 56px; }
  .flow-dock .paper-dock { --w: 44px; }
  [data-flow-live].flow { --runway: 3; }
  [data-flow-live] .flow-stage { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto minmax(0, 1fr); align-items: stretch; gap: 10px; padding: calc(var(--header) + 10px) 0 14px; }
  [data-flow-live] .flow-side { grid-template-columns: auto minmax(0, 1fr); align-items: center; column-gap: 10px; row-gap: 6px; }
  [data-flow-live] .flow-dock p { display: none; }
  [data-flow-live] .flow-dock .paper-dock { --w: 30px; }
  [data-flow-live] .flow-steps { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 2px; }
  [data-flow-live] .flow-steps button { grid-template-columns: 1fr; justify-items: center; padding: 6px 2px 10px; border-radius: 10px; text-align: center; }
  [data-flow-live] .flow-steps b { grid-row: auto; font-size: 10px; line-height: 14px; }
  [data-flow-live] .fs-title { font-size: 13px; }
  [data-flow-live] .fs-note { display: none; }
  [data-flow-live] .fs-fill { left: 6px; right: 6px; bottom: 4px; }
  [data-flow-live] .flow-caption { display: block; grid-column: 1 / -1; min-height: 2.9em; font-size: 13px; line-height: 1.45; color: var(--text-2); }
  [data-flow-live] .flow-app { height: auto; min-height: 0; border-radius: 18px; }
  .fa-bar { height: 38px; padding: 0 12px; }
  .fa-lights { display: none; }
  .fa-screen { padding: 14px 14px; }
  .fa-bubble { font-size: 13.5px; }
  .fa-draft h4 { font-size: 15px; }
}
@media (max-width: 360px) {
  [data-flow-live] .flow-steps b { display: none; }
  [data-flow-live] .fs-title { font-size: 12px; }
}
@media (max-height: 700px) and (max-width: 760px) {
  .fa-day, .fp-tabs, .fq-note { display: none; }
  .fa-chat, .fa-page, .fa-search { gap: 9px; }
  .fa-draft { gap: 5px; padding: 11px 13px 10px; }
}