/* ==========================================================================
   AI 数字分身 — 首页复刻版样式
   依据原站 light 主题的实测计算样式重建：
   颜色 / 字号 / 间距 / 圆角 / 阴影 / 栅格断点均取自实测值。
   字体栈与原站一致（纯系统字体，无 Web Font）。
   ========================================================================== */

:root {
  --paper: #f7f5fb;
  --surface-2: #f1eef8;
  --ink: #1d1930;
  --head: #142238;
  --slate: #59687f;
  --soft: #4f4a63;
  --muted: #7a748c;
  --line: #e3dff0;
  --line-blue: #dce5f0;
  --line-card: #cbd8f0;
  --line-frame: #cbd8e7;
  --accent: #0057ff;
  --accent-dark: #0048d5;
  --orange: #f39800;
  --green: #36aa75;
  --grad-sec: linear-gradient(#f7f5fb, #f1eef8 50%, #f7f5fb);
  --shadow-frame: 0 20px 60px rgba(32, 70, 111, .07);
  --shadow-panel: 0 26px 70px rgba(23, 34, 49, .08);
  --shadow-card: 0 12px 34px rgba(32, 70, 111, .04);
  --shadow-btn: 0 10px 22px rgba(0, 87, 255, .13);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font: 16px/1.75 var(--font);
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
summary { cursor: pointer; }
svg { display: block; }

::selection { color: #fff; background: var(--accent); }

:where(a, button, summary):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page { min-height: 100dvh; overflow-x: clip; }

/* ------------------------------------------------------------------ 顶栏 */

.topbar {
  position: relative;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 60px;
  height: 96px;
  padding-inline: clamp(22px, 4vw, 72px);
  background: rgba(247, 245, 251, .9);
  border-bottom: 1px solid var(--line-blue);
  backdrop-filter: blur(18px);
}

.brand {
  font-size: 27px;
  font-weight: 760;
  letter-spacing: -.045em;
  color: var(--head);
  line-height: 1.75;
  white-space: nowrap;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 40px;
  margin-right: auto;
}

.topnav a {
  position: relative;
  display: block;
  padding: 10px 0;
  color: #46536b;
  transition: color .2s;
}

.topnav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 4px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s;
}

.topnav a:hover { color: var(--accent); }
.topnav a:hover::after { transform: scaleX(1); }

.topbar-tools { display: flex; align-items: center; gap: 14px; }

.lang {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 40px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--soft);
  font-size: 13px;
  font-weight: 600;
  transition: color .2s, background .2s, border-color .2s;
}

.lang svg { width: 18px; height: 18px; overflow: hidden; }
.lang:hover { color: var(--accent); border-color: var(--line-blue); background: #fff; }

.btn-login {
  display: block;
  padding: 12px 27px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  color: #fff;
  background: var(--accent);
  font-size: 15px;
  line-height: 1.75;
  white-space: nowrap;
  box-shadow: 0 10px 22px rgba(0, 87, 255, .125);
  transition: background .2s, border-color .2s, transform .16s;
}

.btn-login:hover { background: var(--accent-dark); border-color: var(--accent-dark); transform: translateY(-1px); }

.menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: 10px;
  color: var(--head);
}

.menu-btn svg { width: 24px; height: 24px; }
.menu-btn:hover { background: #fff; }

/* ------------------------------------------------------------------ 按钮 */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 18px 38px;
  overflow: hidden;
  border: 1px solid var(--accent);
  border-radius: 9px;
  color: #fff;
  background: var(--accent);
  font-size: 19px;
  font-weight: 500;
  line-height: 1.4;
  box-shadow: var(--shadow-btn);
  transition: transform .16s ease, box-shadow .18s ease, background-color .18s ease, border-color .18s ease, color .18s ease;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(105deg, transparent 30%, rgba(255, 255, 255, .22) 50%, transparent 70%);
  transform: translateX(-130%);
  transition: transform .6s ease;
}

.btn:hover { transform: translateY(-2px); box-shadow: 0 16px 30px rgba(0, 87, 255, .22); }
.btn:hover::after { transform: translateX(130%); }
.btn:active { transform: translateY(0) scale(.98); }

.btn--ghost {
  padding-inline: 10px;
  color: var(--accent);
  background: transparent;
  border-color: transparent;
  box-shadow: none;
}

.btn--ghost:hover { color: var(--accent-dark); background: rgba(0, 87, 255, .06); box-shadow: none; }
.btn--ghost::after { display: none; }

.btn--block { width: 100%; padding: 12px 10px; font-size: 16px; }

/* --------------------------------------------------------------- 首屏 Hero */

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(360px, .96fr) minmax(520px, 1fr);
  gap: clamp(34px, 5vw, 72px);
  align-items: center;
  max-width: 1560px;
  min-height: min(770px, calc(100vh - 86px));
  margin-inline: auto;
  padding: 42px clamp(24px, 5vw, 72px) 62px;
  background: #fff;
}

.hero-copy { position: relative; z-index: 3; }

.hero h1 {
  max-width: 680px;
  color: var(--head);
  font-size: clamp(50px, 4.55vw, 72px);
  font-weight: 760;
  line-height: 1.22;
  letter-spacing: -.065em;
}

.hero h1 span { display: block; }
.hero h1 em {
  display: block;
  margin-top: 4px;
  color: var(--accent);
  font-style: normal;
  letter-spacing: -.035em;
}

.hero-lede {
  max-width: 620px;
  margin-top: 30px;
  color: var(--slate);
  font-size: 17px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-top: 38px;
}

/* ------------------------------------------------------- 首屏「分身」结构图 */

.stage {
  position: relative;
  align-self: stretch;
  min-height: 590px;
  color: var(--head);
}

.stage-links {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  fill: #0057ff;
  stroke: #0057ff;
  stroke-width: 1.6;
}

.stage-links path { fill: none; }
.stage-links path:first-child { stroke-dasharray: 4 5; opacity: .75; }
.stage-links circle { stroke: none; }

.stage-core {
  position: absolute;
  left: 50%;
  top: 48%;
  z-index: 2;
  width: 128px;
  height: 128px;
  border: 1px solid #d7e3f4;
  border-radius: 50%;
  background: #f5f8ff;
  box-shadow: 0 0 0 18px #f8faff;
  transform: translate(-50%, -50%);
  animation: core-breathe 5.4s ease-in-out infinite;
}

.stage-person {
  position: absolute;
  bottom: 35px;
  width: 30px;
  height: 30px;
  border-radius: 50% 50% 42% 42%;
  background: var(--accent);
}

.stage-person::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 23px;
  width: 44px;
  height: 27px;
  border-radius: 50% 50% 10px 10px;
  background: inherit;
  transform: translateX(-50%);
}

.stage-person--front { left: 35px; z-index: 2; }
.stage-person--back { right: 30px; bottom: 29px; opacity: .28; transform: scale(.88); }

.stage-badge {
  position: absolute;
  top: 17px;
  left: 50%;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 6px;
  color: #33445c;
  font-size: 10px;
  font-weight: 650;
  white-space: nowrap;
  transform: translateX(-50%);
}

.stage-badge i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  animation: badge-pulse 2.2s ease-in-out infinite;
}

.stage-card {
  position: absolute;
  width: 235px;
  padding: 18px;
  border: 1px solid var(--line-card);
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--shadow-card);
}

.stage-card header {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 24px;
  gap: 10px;
  align-items: center;
  margin-bottom: 15px;
}

.stage-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 9px;
  color: var(--accent);
  background: #edf3ff;
}

.stage-icon svg { width: 24px; height: 24px; }

.stage-card h3 {
  color: var(--head);
  font-size: 15px;
  font-weight: 720;
  line-height: 1.75;
}

.stage-card header small {
  display: block;
  margin-top: 3px;
  color: #718098;
  font-size: 10px;
  line-height: 1.45;
}

.stage-card header b {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid #cfe0fb;
  border-radius: 6px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 450;
}

.stage-card ul { display: grid; gap: 7px; }

.stage-card li {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  overflow: hidden;
  border-radius: 5px;
  color: #58677d;
  background: #f5f7fa;
  font-size: 10px;
  line-height: 1.75;
  white-space: nowrap;
}

.stage-card--knowledge { top: 74px; left: 0; animation: float 7s ease-in-out infinite; }
.stage-card--persona { top: 74px; right: 0; animation: float 7.8s ease-in-out .5s infinite; }

.stage-card--service {
  bottom: 14px;
  left: 76px;
  width: 300px;
  transform: translateX(50%);
}

.stage-card--service li {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr) 7px;
  gap: 7px;
  padding: 8px 0;
  border-top: 1px solid #edf1f6;
  background: transparent;
}

.stage-card--service li:first-child { border-top: 0; }

.stage-card--service li > span {
  display: grid;
  place-items: center;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  color: var(--accent);
  background: #edf3ff;
  font-size: 8px;
}

.stage-card--service li > i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #bdc8d7;
}

.stage-card--service li > i.is-live { background: var(--orange); }

/* ------------------------------------------------------------ 通用 section */

.sec {
  position: relative;
  padding: 110px clamp(25px, 5vw, 72px);
  border-top: 1px solid var(--line);
  background: #fff;
}

.sec--grad { background: var(--grad-sec); }

.sec--assets { padding: 118px clamp(25px, 3.4vw, 48px); }
.sec--studio { padding: 120px clamp(25px, 5vw, 72px); }
.sec--why { padding-block: 100px; background: #f5f8fc; }
.sec--pricing,
.sec--faq {
  max-width: 1380px;
  margin-inline: auto;
  padding-block: 100px;
}

.sec--faq { background: #f8faff; }

/* 滚动入场（JS 加上 motion-ready 后才启用，避免无 JS 时不可见） */
.page.motion-ready .sec,
.page.motion-ready .cta {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s ease, transform .76s cubic-bezier(.2, .8, .2, 1);
}

.page.motion-ready .sec.is-visible,
.page.motion-ready .cta.is-visible { opacity: 1; transform: none; }

.sec-head { max-width: 750px; margin-bottom: 46px; }
.sec-head--wide { max-width: none; }

.sec-head h2,
.cta h2,
.h2-lg {
  color: var(--ink);
  font-size: clamp(38px, 4vw, 62px);
  font-weight: 740;
  line-height: 1.32;
  letter-spacing: -.045em;
}

.sec-head h2 { font-size: clamp(30px, 3vw, 43px); line-height: 1.5; letter-spacing: -.045em; }
.sec-head h2 span { display: block; }
.sec-head h2 span.is-accent { color: var(--accent); }

.sec-head .lede {
  max-width: 680px;
  margin-top: 18px;
  color: var(--soft);
  font-size: 17px;
  line-height: 1.85;
}

/* ============================================================ 01 六步流程 */

.flow-layout {
  display: grid;
  grid-template-columns: minmax(420px, .92fr) minmax(480px, 1.08fr);
  gap: 60px;
  align-items: center;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: clamp(0px, 5vw, 72px);
}

.flow-visual {
  position: relative;
  min-height: 610px;
}

.flow-lines {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.8;
}

.flow-sources {
  position: absolute;
  top: 44px;
  bottom: 44px;
  left: 0;
  z-index: 2;
  width: 40%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.flow-sources article {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  min-height: 112px;
  padding: 17px;
  border: 1px solid var(--line-card);
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 12px 30px rgba(32, 70, 111, .03);
}

.flow-source-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 9px;
  color: var(--accent);
  background: #edf3ff;
}

.flow-source-icon svg { width: 26px; height: 26px; }

.flow-sources strong {
  display: block;
  color: var(--head);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.75;
}

.flow-sources small {
  display: block;
  margin-top: 5px;
  color: #718098;
  font-size: 10px;
  line-height: 1.55;
}

.flow-sources article > i {
  position: absolute;
  top: 50%;
  right: -5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-50%);
}

.flow-sources article:nth-child(2) > i { background: var(--orange); }

.flow-core {
  position: absolute;
  left: 46%;
  top: 50%;
  z-index: 3;
  width: 76px;
  height: 76px;
  border: 1px solid #cbdaf0;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 12px #f1f5fb;
  transform: translate(-50%, -50%);
}

.flow-core span {
  position: absolute;
  bottom: 23px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--accent);
}

.flow-core span::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 14px;
  width: 28px;
  height: 17px;
  border-radius: 50% 50% 8px 8px;
  background: inherit;
  transform: translateX(-50%);
}

.flow-core span:first-child { left: 20px; z-index: 2; }
.flow-core span:last-child { right: 17px; bottom: 19px; opacity: .28; transform: scale(.85); }

.flow-library {
  position: absolute;
  top: 50%;
  right: 0;
  z-index: 2;
  width: 36%;
  padding: 18px;
  border: 1px solid #cbdaf0;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 14px 38px rgba(32, 70, 111, .047);
  transform: translateY(-50%);
}

.flow-library header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 13px;
  border-bottom: 1px solid #e6edf5;
}

.flow-library header strong { color: var(--head); font-size: 14px; }
.flow-library header span { color: #a6b4c6; letter-spacing: .18em; }

.flow-library > div {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 22px;
  gap: 10px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid #edf1f5;
}

.flow-library > div:last-child { border-bottom: 0; }

.flow-library-icon {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 7px;
  color: var(--accent);
  background: #edf3ff;
}

.flow-library-icon svg { width: 21px; height: 21px; }

.flow-library p strong { display: block; color: #24344a; font-size: 11px; font-weight: 700; line-height: 1.75; }

.flow-library p i {
  display: block;
  width: 80%;
  height: 5px;
  margin-top: 7px;
  border-radius: 4px;
  background: #e5ebf3;
}

.flow-library > div > b {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  color: #fff;
  background: var(--green);
  font-size: 10px;
  font-weight: 700;
}

.flow-copy { position: relative; padding-bottom: 22px; }

.flow-copy h2 {
  color: var(--ink);
  font-size: clamp(38px, 4vw, 62px);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -.045em;
  margin-bottom: 18px;
}

.flow-copy h2 span { display: block; color: var(--accent); }
.flow-intro { margin-bottom: 28px; color: var(--ink-soft, #4f4a63); font-size: 16px; }

.flow-steps { position: relative; display: grid; }

.flow-steps::before {
  content: "";
  position: absolute;
  top: 40px;
  bottom: 40px;
  left: 42px;
  width: 1px;
  background: linear-gradient(#c9bdf0, #6d4fd6, #e3dff0);
}

.flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  min-height: 92px;
  padding: 16px 10px 16px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  color: var(--ink);
  text-align: left;
  transition: background .3s, border-color .3s, transform .3s;
}

.flow-step:hover { border-color: #6d4fd6; }
.flow-step[aria-pressed="true"] {
  border-color: #c9bdf0;
  border-radius: 8px;
  background: linear-gradient(90deg, transparent, rgba(109, 79, 214, .08));
}

.flow-number {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid #9eafb9;
  border-radius: 50%;
  color: var(--accent);
  background: #fff;
  font-size: 15px;
  line-height: 1.75;
}

.flow-step[aria-pressed="true"] .flow-number {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent);
}

.flow-step strong {
  display: block;
  color: var(--head);
  font-size: 17px;
  font-weight: 710;
  line-height: 1.75;
}

.flow-step[aria-pressed="true"] strong { color: var(--accent); }

.flow-step-body {
  display: block;
  margin-top: 4px;
  color: var(--soft);
  font-size: 12px;
  line-height: 1.65;
}

.flow-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  padding-left: 64px;
  color: var(--soft);
}

.flow-caption p {
  color: var(--soft);
  font-size: 13px;
  line-height: 1.6;
}

.page.motion-ready .sec.is-visible .flow-step { animation: step-in .56s both; }
.page.motion-ready .sec.is-visible .flow-step:nth-child(2) { animation-delay: 70ms; }
.page.motion-ready .sec.is-visible .flow-step:nth-child(3) { animation-delay: .14s; }
.page.motion-ready .sec.is-visible .flow-step:nth-child(4) { animation-delay: .21s; }
.page.motion-ready .sec.is-visible .flow-step:nth-child(5) { animation-delay: .28s; }
.page.motion-ready .sec.is-visible .flow-step:nth-child(6) { animation-delay: .35s; }

/* ================================================== 02 知识资产（产品界面） */

.assets-heading {
  display: grid;
  grid-template-columns: 5fr 3fr;
  gap: 60px;
  align-items: end;
  margin-bottom: 54px;
}

.assets-index {
  margin-bottom: 16px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .12em;
}

.assets-heading h2 {
  max-width: 850px;
  color: var(--ink);
  font-size: clamp(38px, 4vw, 62px);
  font-weight: 740;
  line-height: 1.32;
  letter-spacing: -.045em;
}

.assets-heading h2 span { display: block; }
.assets-heading > p { color: #5e6e78; font-size: 15px; line-height: 1.9; }

.assets-app {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) 250px;
  min-height: 590px;
  overflow: hidden;
  border: 1px solid #cbd8e7;
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--shadow-frame);
}

.assets-side {
  padding: 28px 18px;
  color: #d8e1e6;
  background: #14263a;
}

.assets-side > strong { display: block; margin: 0 10px 32px; color: #fff; font-size: 15px; font-weight: 700; }

.assets-side > span {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  padding: 11px 10px;
  border-radius: 7px;
  color: #b8c7d0;
  font-size: 12px;
  line-height: 1.75;
}

.assets-side > span i { color: #8297a4; font-style: normal; font-size: 10px; }
.assets-side > span.is-active { color: #fff; background: var(--accent); }
.assets-side > span.is-active i { color: #dce7ff; }

.assets-main { padding: 38px 36px; }

.assets-main > header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }

.assets-main header small { color: var(--accent); font-size: 10px; font-weight: 700; letter-spacing: .11em; }
.assets-main header h3 { margin: 7px 0 14px; color: #172733; font-size: 20px; font-weight: 500; line-height: 1.5; }

.assets-main header button {
  min-height: 40px;
  padding: 0 16px;
  border-radius: 7px;
  color: #fff;
  background: var(--accent);
  font-size: 12px;
  font-weight: 650;
  white-space: nowrap;
}

.assets-tabs {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  border-bottom: 1px solid #d9e0e2;
}

.assets-tabs span {
  position: relative;
  padding: 0 0 12px;
  color: #71808a;
  font-size: 12px;
}

.assets-tabs span.is-active { color: #172733; font-weight: 650; }

.assets-tabs span.is-active::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--accent);
}

.assets-list { margin-top: 12px; }

.assets-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 18px 8px;
  border-bottom: 1px solid #e2e7e8;
}

.assets-row > i {
  display: grid;
  place-items: center;
  width: 30px;
  height: 34px;
  border-radius: 4px;
  color: #fff;
  background: var(--accent);
  font-size: 11px;
  font-style: normal;
}

.assets-row strong { display: block; overflow: hidden; color: #1d2e3a; font-size: 13px; font-weight: 650; line-height: 1.75; }
.assets-row small { display: block; margin-top: 4px; color: #75838c; font-size: 11px; line-height: 1.75; }

.assets-row > b {
  padding: 5px 8px;
  border-radius: 5px;
  color: var(--accent);
  background: #e8efff;
  font-size: 10px;
  font-weight: 650;
  white-space: nowrap;
}

.assets-review {
  padding: 38px 26px;
  border-left: 1px solid #d8e0e2;
  background: #f7f9f8;
}

.assets-review > small { color: var(--accent); font-size: 10px; font-weight: 700; letter-spacing: .11em; }
.assets-review h3 { margin: 7px 0 14px; color: #172733; font-size: 20px; font-weight: 500; line-height: 1.5; }

.assets-review > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 16px 0;
  border-top: 1px solid #dce3e4;
  color: #66757e;
  font-size: 12px;
  line-height: 1.75;
}

.assets-review > div strong { color: #172733; font-size: 26px; font-weight: 550; font-variant-numeric: tabular-nums; }

.assets-review > p {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 3px solid var(--orange);
  color: #596a74;
  font-size: 12px;
  line-height: 1.8;
}

/* ==================================================== 03 工作室 / 客户空间 */

.studio-frame {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 2.2fr) minmax(320px, 1fr);
  overflow: hidden;
  border: 1px solid #cbd8e7;
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--shadow-panel);
}

.studio-owner > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 92px;
  padding: 20px 28px;
  border-bottom: 1px solid var(--line);
}

.studio-owner header span { display: flex; flex-direction: column; }
.studio-owner header strong { color: var(--ink); font-size: 15px; font-weight: 700; }
.studio-owner header small { color: var(--muted); font-size: 10px; line-height: 1.75; }

.studio-stats { display: flex; gap: 8px; }

.studio-stats > div {
  padding: 10px 12px;
  border: 1px solid var(--line-blue);
  border-radius: 9px;
  background: #f5f8fc;
}

.studio-stats dt { color: var(--muted); font-size: 9px; line-height: 1.75; }
.studio-stats dd { margin-top: 3px; color: var(--ink); font-size: 13px; line-height: 1.75; font-variant-numeric: tabular-nums; }

.studio-owner-body { display: grid; grid-template-columns: 156px minmax(0, 1fr); }

.studio-side { padding: 28px 16px; background: var(--paper); }

.studio-side span {
  display: block;
  margin-bottom: 8px;
  padding: 12px 13px;
  border-radius: 8px;
  color: #3d4a5e;
  font-size: 11px;
  line-height: 1.45;
}

.studio-side span.is-active {
  color: var(--accent);
  background: #edf3ff;
  box-shadow: inset 2px 0 0 0 var(--accent);
}

.studio-content { padding: 32px; }
.studio-label { color: var(--accent); font-size: 11px; letter-spacing: .08em; }
.studio-content h3 { margin: 4px 0 24px; color: var(--ink); font-size: 21px; font-weight: 500; line-height: 1.5; }

.studio-tasks { display: grid; gap: 10px; }

.studio-tasks > div {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 15px;
  border: 1px solid #9dbbff;
  border-radius: 12px;
  background: #edf3ff;
}

.studio-tasks > div:not(.is-current) { border-color: var(--line-blue); background: #f7f9fd; }

.studio-tasks > div > i {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid #9dbbff;
  border-radius: 50%;
  color: var(--accent);
  background: #fff;
  font-size: 12px;
  font-style: normal;
}

.studio-tasks span { display: flex; flex-direction: column; }
.studio-tasks strong { color: var(--ink); font-size: 12px; font-weight: 550; line-height: 1.75; }
.studio-tasks small { margin-top: 3px; color: var(--muted); font-size: 9px; line-height: 1.75; }

.studio-tasks b {
  padding: 7px 10px;
  border-radius: 7px;
  color: #fff;
  background: var(--accent);
  font-size: 9px;
  font-weight: 500;
  white-space: nowrap;
}

.studio-tasks > div:not(.is-current) b { color: var(--accent); background: #e8efff; }

.studio-table { margin-top: 30px; border-top: 1px solid var(--line); }

.studio-table-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 13px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--accent);
  font-size: 10px;
  font-weight: 700;
}

.studio-table-head span { font-weight: 400; }

.studio-customer {
  display: grid;
  grid-template-columns: 1.25fr 2fr 1.25fr 1fr;
  gap: 12px;
  align-items: center;
  padding: 13px 4px;
  border-bottom: 1px solid var(--line);
  font-size: 10px;
  line-height: 1.75;
}

.studio-customer strong { color: var(--ink); font-weight: 700; }
.studio-customer span { color: #4a5666; }
.studio-customer small { color: var(--muted); font-size: 8.5px; }
.studio-customer b { color: var(--accent); font-weight: 500; }

.studio-client { background: #f8faff; }

.studio-client nav {
  display: flex;
  align-items: center;
  justify-content: space-around;
  border-bottom: 1px solid var(--line);
}

.studio-client nav span { padding: 28px 8px 20px; color: #63707f; font-size: 11px; line-height: 1.75; }
.studio-client nav span.is-active { color: var(--accent); box-shadow: inset 0 -2px 0 0 var(--orange); }

.studio-chat {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 260px;
  padding: 28px 22px;
}

.studio-chat p { max-width: 88%; padding: 13px 15px; font-size: 11px; line-height: 1.7; }

.studio-chat .is-user {
  align-self: flex-end;
  border-radius: 12px 12px 3px 12px;
  color: #fff;
  background: var(--accent);
}

.studio-chat .is-assistant {
  align-self: flex-start;
  border: 1px solid var(--line-blue);
  border-radius: 12px 12px 12px 3px;
  color: #24344a;
  background: #f0f4fa;
}

.studio-actions {
  margin: 0 20px 28px;
  padding: 20px;
  border: 1px solid var(--line-blue);
  border-radius: 14px;
  background: #fff;
}

.studio-actions span { display: flex; flex-direction: column; }
.studio-actions strong { color: var(--ink); font-size: 13px; font-weight: 700; }
.studio-actions small { margin-top: 4px; color: var(--muted); font-size: 9px; line-height: 1.75; }
.studio-actions ol { margin-top: 16px; padding-left: 24px; color: var(--soft); font-size: 10px; line-height: 2.2; list-style: decimal; }

.studio-note { margin-top: 14px; color: var(--muted); font-size: 8px; line-height: 1.75; text-align: right; }

.studio-split { display: grid; grid-template-columns: 1fr 1fr; margin-top: 42px; border-top: 1px solid var(--line); }
.studio-split > div { padding: 32px 40px 0; }
.studio-split strong { color: var(--accent); font-size: 14px; font-weight: 700; }
.studio-split p { margin-top: 8px; color: var(--soft); }

/* ============================================================ 04 为什么做 */

.why-note {
  display: grid;
  grid-template-columns: minmax(280px, .56fr) minmax(0, 1fr);
  gap: 90px;
  max-width: 1180px;
  margin-inline: auto;
  color: var(--head);
}

.why-note h2 { max-width: 12em; margin-bottom: 24px; font-size: clamp(32px, 4vw, 58px); font-weight: 740; line-height: 1.25; letter-spacing: -.045em; }
.why-note .why-sub { max-width: 320px; color: #5c6b80; font-size: 18px; line-height: 1.75; }
.why-copy { max-width: 680px; }
.why-copy p { color: #5c6b80; font-size: 17px; line-height: 2; }

/* ============================================================ 05 订阅方案 */

.pricing-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 44px;
}

.pricing-head .sec-head { margin-bottom: 0; }

.toggle {
  display: flex;
  padding: 4px;
  border: 1px solid #c9bdf0;
  border-radius: 13px;
  background: #fff;
}

.toggle button {
  min-height: 42px;
  padding: 8px 18px;
  border-radius: 9px;
  color: var(--soft);
  font-size: 14px;
  line-height: 1.75;
  white-space: nowrap;
}

.toggle button[aria-pressed="true"] { color: #fff; background: var(--accent); }

.trial {
  display: flex;
  align-items: center;
  gap: 10px 18px;
  margin-bottom: 22px;
  padding: 16px 20px;
  border: 1px solid #c9bdf0;
  border-radius: 14px;
  background: #fff;
}

.trial strong { color: var(--accent); font-size: 16px; font-weight: 700; white-space: nowrap; }
.trial span { flex: 1 1 320px; color: var(--soft); font-size: 14px; line-height: 1.6; }
.trial .btn { flex: none; padding: 12px 10px; font-size: 16px; white-space: nowrap; }

.plans {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--line-frame);
  border-radius: 10px;
}

.plan {
  display: flex;
  flex-direction: column;
  padding: 30px 26px;
  border: 1px solid transparent;
  background: #fff;
}

.plan + .plan { border-left: 1px solid #cbd8e7; }
.plan:nth-child(2) { background: linear-gradient(155deg, #f3effc, #faf8fe 72%); }

.plan-name { margin-bottom: 24px; color: var(--ink); font-size: 27px; letter-spacing: -.02em; line-height: 1.75; }
.plan h3 { min-height: 60px; margin-bottom: 14px; color: var(--ink); font-size: 18px; font-weight: 500; line-height: 1.5; }
.plan-capacity { margin: -6px 0 10px; color: var(--muted); font-size: 12px; line-height: 1.75; }

.plan-price { display: flex; align-items: baseline; gap: 8px; margin: 4px 0 26px; }
.plan-price strong { color: var(--ink); font-size: 42px; font-weight: 500; line-height: 1.75; letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.plan-price span { color: var(--muted); font-size: 14px; }

.plan-period { margin-bottom: 20px; padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--soft); font-size: 14px; }
.plan-period strong { color: var(--accent); font-weight: 500; }

.plan ul { flex: 1; padding-left: 20px; margin: 12px 0 30px; color: var(--soft); font-size: 14px; line-height: 1.9; list-style: disc; }
.plan li { margin-bottom: 12px; }
.plan li::marker { color: var(--orange); }
.plan .btn { width: 100%; padding: 12px 10px; font-size: 16px; }

.plans-note { margin-top: 20px; color: var(--muted); font-size: 12px; line-height: 1.75; text-align: center; }

/* ================================================================ 06 FAQ */

.faq-layout { display: grid; grid-template-columns: 335px minmax(0, 1fr); gap: 80px; }
.faq-layout .sec-head { margin-bottom: 0; }

.faq details { padding: 22px 0; border-bottom: 1px solid var(--line-blue); }
.faq details:first-child { border-top: 1px solid var(--line-blue); }

.faq summary {
  position: relative;
  padding: 25px 42px 25px 0;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.6;
  list-style: none;
  transition: color .2s;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "";
  position: absolute;
  right: 7px;
  top: 33px;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  transform: rotate(45deg);
  transition: transform .2s;
}

.faq details[open] summary { color: var(--accent); }
.faq details[open] summary::after { transform: rotate(225deg); }

.faq details p {
  max-width: 820px;
  margin-top: 18px;
  padding: 0 25px 30px 0;
  color: var(--soft);
  font-size: 15px;
  line-height: 1.9;
}

/* ================================================================ CTA */

.cta {
  padding: 100px 40px 110px;
  border-top: 1px solid var(--line);
  background: radial-gradient(at 50% 100%, rgba(109, 79, 214, .12), rgba(0, 0, 0, 0) 70%);
  text-align: center;
}

.cta h2 { font-size: clamp(30px, 3vw, 43px); line-height: 1.5; }
.cta .lede { max-width: 680px; margin: 18px auto 0; color: var(--soft); font-size: 17px; line-height: 1.85; }
.cta .hero-actions { justify-content: center; margin-top: 38px; }

/* ============================================================== 页脚 */

.site-footer {
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: 1440px;
  margin-inline: auto;
  padding: 32px clamp(22px, 4vw, 72px) 40px;
  border-top: 1px solid var(--line-blue);
  background: #fff;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.75;
}

.site-footer span { margin-right: auto; }
.site-footer a { color: var(--muted); transition: color .2s; }
.site-footer a:hover { color: var(--accent); }

/* ============================================================ 动画 */

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes float-center {
  0%, 100% { transform: translateX(50%) translateY(0); }
  50% { transform: translateX(50%) translateY(-8px); }
}

@keyframes badge-pulse {
  0%, 100% { opacity: .65; box-shadow: 0 0 0 4px rgba(243, 152, 0, .07); }
  50% { opacity: 1; box-shadow: 0 0 0 8px rgba(243, 152, 0, .03); }
}

@keyframes core-breathe {
  0%, 100% { transform: translate(-50%, -50%) scale(.98); }
  50% { transform: translate(-50%, -50%) scale(1.035); }
}

@keyframes step-in {
  from { opacity: 0; transform: translateX(-16px); }
}

/* ============================================================ 响应式 */

@media (max-width: 1200px) {
  .studio-frame { grid-template-columns: minmax(0, 1.8fr) minmax(320px, .9fr); }
}

@media (max-width: 1080px) {
  .hero { grid-template-columns: 1fr; padding-top: 54px; }
  .hero-copy { max-width: 720px; }
  .stage { min-height: 560px; }
  .assets-app { grid-template-columns: 150px minmax(0, 1fr); }
  .assets-review { grid-column: 1 / -1; border-left: 0; border-top: 1px solid #d8e0e2; }
  .assets-review > div { display: inline-flex; width: 33%; gap: 20px; vertical-align: top; }
}

@media (max-width: 980px) {
  .sec { padding-inline: 44px; }
  .sec--assets { padding-inline: 44px; }
  .flow-layout { grid-template-columns: 1fr; max-width: 860px; padding-inline: 16px; }
  .flow-visual { min-height: 590px; }
  .studio-frame { grid-template-columns: 1fr; }
  .studio-owner > header + .studio-owner-body { border-bottom: 1px solid var(--line-frame); }
  .studio-owner-body { border-bottom: 1px solid var(--line-frame); }
  .why-note { grid-template-columns: 1fr; gap: 48px; max-width: none; }
  .why-note h2 { max-width: none; }
}

@media (max-width: 900px) {
  .topnav { display: none; }
  .menu-btn { display: block; }
  .topbar { gap: 16px; }
  .topbar-tools { margin-left: auto; }
  .topbar[data-open="true"] .topnav {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    position: absolute;
    top: 96px;
    right: 0;
    left: 0;
    padding: 12px 24px 20px;
    background: rgba(247, 245, 251, .98);
    border-bottom: 1px solid var(--line-blue);
    box-shadow: 0 18px 40px rgba(32, 70, 111, .08);
    animation: drawer .28s ease both;
  }
  .studio-owner-body { grid-template-columns: 82px minmax(0, 1fr); }
  .studio-split > div { padding-inline: 24px; }
}

@keyframes drawer {
  from { opacity: 0; transform: translateY(-8px); }
}

@media (max-width: 860px) {
  .sec { padding-block: 96px; }
  .faq-layout { grid-template-columns: 1fr; gap: 40px; }
  .faq details:first-child { border-top: 0; }
}

@media (max-width: 820px) {
  .plans { grid-template-columns: 1fr; border-radius: 14px; }
  .plan + .plan { border-left: 0; border-top: 1px solid #cbd8e7; }
  .plan h3 { min-height: 0; }
  .pricing-head { flex-direction: column; align-items: flex-start; }
  .toggle { align-self: flex-start; }
  .studio-split { grid-template-columns: 1fr; }
  .studio-split > div { padding: 24px 0 0; }
}

@media (max-width: 760px) {
  .sec { padding: 76px 25px; }
  .sec--assets { padding-inline: 25px; }
  .sec--studio,
  .sec--why,
  .sec--pricing,
  .sec--faq { padding-block: 76px; }
  .hero { padding: 36px 16px 48px; gap: 32px; }
  .hero h1 { font-size: 42px; }
  .hero-actions { flex-wrap: wrap; gap: 14px; }
  .btn { padding-inline: 24px; font-size: 17px; }
  .btn--ghost { padding-inline: 6px; }
  .stage { min-height: 500px; }
  .stage-card { width: 158px; padding: 12px 13px; }
  .stage-card h3 { font-size: 12px; }
  .stage-card header { grid-template-columns: 34px minmax(0, 1fr) 20px; gap: 8px; }
  .stage-icon { width: 34px; height: 34px; }
  .stage-icon svg { width: 20px; height: 20px; }
  .stage-card header small { font-size: 8px; }
  .stage-card header b { width: 20px; height: 20px; font-size: 12px; }
  .stage-card li { padding: 7px; font-size: 8px; }
  .stage-card--knowledge { top: 12px; left: 0; }
  .stage-card--persona { top: 12px; right: 0; }
  .stage-core { top: 55%; width: 104px; height: 104px; }
  .stage-badge { top: 12px; font-size: 9px; }
  .stage-card--service { right: 0; bottom: 8px; left: 0; width: 100%; transform: none; }
  .stage-links { display: none; }
  .flow-layout { gap: 34px; }
  .flow-lines { display: none; }
  .flow-visual { min-height: 500px; }
  .flow-sources { top: 10px; bottom: 10px; width: 44%; }
  .flow-sources article { grid-template-columns: 34px minmax(0, 1fr); gap: 8px; min-height: 104px; padding: 10px; }
  .flow-source-icon { width: 34px; height: 34px; }
  .flow-source-icon svg { width: 20px; height: 20px; }
  .flow-sources strong { font-size: 11px; }
  .flow-sources small { font-size: 9px; }
  .flow-library { width: 44%; padding: 11px; }
  .flow-library > div { grid-template-columns: 30px minmax(0, 1fr) 18px; gap: 6px; padding: 11px 0; }
  .flow-library-icon { width: 30px; height: 30px; }
  .flow-library p strong { font-size: 9px; }
  .flow-library > div > b { width: 18px; height: 18px; font-size: 9px; }
  .flow-core { left: 48%; width: 58px; height: 58px; box-shadow: 0 0 0 9px #f1f5fb; }
  .flow-core span { bottom: 19px; width: 14px; height: 14px; }
  .flow-core span::after { top: 10px; width: 21px; height: 13px; }
  .flow-core span:first-child { left: 15px; }
  .flow-core span:last-child { right: 13px; bottom: 16px; }
  .flow-copy h2 { font-size: 34px; }
  .h2-lg,
  .assets-heading h2,
  .sec-head h2 { font-size: 34px; }
  .flow-step { min-height: 82px; }
  .flow-step strong { font-size: 15px; }
  .flow-steps::before { left: 23px; top: 30px; bottom: 30px; }
  .assets-heading { grid-template-columns: 1fr; gap: 24px; align-items: start; margin-bottom: 34px; }
  .assets-heading > p { font-size: 14px; }
  .studio-frame { border-radius: 16px; }
  .studio-owner > header { flex-direction: column; align-items: flex-start; }
  .studio-content { padding: 22px 18px; }
  .studio-split > div { padding-inline: 0; }
  .studio-note { text-align: left; }
  .studio-customer { grid-template-columns: 1fr 1fr; }
  .studio-chat { min-height: 0; padding: 22px 16px; }
  .studio-actions { margin: 0 16px 22px; }
  .why-note h2 { font-size: 34px; }
  .why-copy p { font-size: 16px; line-height: 1.9; }
  .pricing-head { margin-bottom: 28px; }
  .trial { flex-wrap: wrap; }
  .trial .btn { margin-left: 0; }
  .plan { padding: 24px 20px; }
  .faq summary { padding-block: 22px; font-size: 16px; }
  .faq details p { font-size: 14px; }
  .cta { padding: 76px 20px 84px; }
  .cta h2 { font-size: 30px; }
  .site-footer { flex-wrap: wrap; gap: 8px 18px; padding: 26px 20px 34px; }
  .site-footer span { flex: 0 0 100%; margin-right: 0; }
}

@media (max-width: 600px) {
  .assets-app { display: block; }
  .assets-side { display: flex; align-items: center; gap: 6px; padding: 12px; overflow-x: auto; }
  .assets-side > strong { flex: none; margin: 0 12px 0 0; font-size: 12px; }
  .assets-side > span { flex: none; margin: 0; padding: 8px 10px; }
  .assets-side > span i { display: none; }
  .assets-main { padding: 26px 20px; }
  .assets-tabs { gap: 16px; overflow-x: auto; }
  .assets-tabs span { flex: none; }
  .assets-row { grid-template-columns: 30px minmax(0, 1fr); }
  .assets-row > b { grid-column: 2; justify-self: start; }
  .assets-review > div { display: flex; width: auto; }
  .studio-owner-body { grid-template-columns: 1fr; }
  .studio-side { display: flex; gap: 6px; padding: 12px; overflow-x: auto; border-bottom: 1px solid var(--line); }
  .studio-side span { flex: none; margin: 0; padding: 8px 12px; }
  .studio-tasks > div { grid-template-columns: 32px minmax(0, 1fr); }
  .studio-tasks b { grid-column: 2; justify-self: start; }
  .studio-stats { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 42px; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 9vw; }
  .topbar { height: 76px; gap: 6px; padding-inline: 12px; }
  .brand { font-size: 20px; }
  .btn-login { margin-left: auto; padding: 8px 10px; border-radius: 8px; font-size: 12px; white-space: nowrap; }
  .lang { padding: 0 6px; font-size: 12px; }
  .lang svg { width: 16px; height: 16px; }
  .topbar[data-open="true"] .topnav { top: 76px; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .page.motion-ready .sec,
  .page.motion-ready .cta { opacity: 1; transform: none; }
}