:root {
  --background: #f2f7f3;
  --paper: #fff;
  --ink: #222c26;
  --muted: #58665e;
  --line: #d3dcd5;
  --blue: #145ca8;
  --green: #247143;
  --sans: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; background: var(--background); color: var(--ink); font: 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
h1,h2,h3,p { margin: 0; }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #073e79; }
a:focus-visible, summary:focus-visible { outline: 3px solid #2577bf; outline-offset: 4px; border-radius: 3px; }
.shell { width: min(1080px, calc(100% - 64px)); margin-inline: auto; }
.skip { position: fixed; top: -100px; left: 16px; background: white; padding: 12px; z-index: 10; }
.skip:focus { top: 8px; }
.top { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
.brand { color: var(--ink); display: flex; align-items: center; gap: 9px; text-decoration: none; white-space: nowrap; }
.brand img { border-radius: 8px; }
.brand strong { font-size: 23px; letter-spacing: -1px; }
.brand>span { font-size: 13px; color: var(--muted); border-left: 1px solid #c4cfc7; padding-left: 11px; margin-left: 2px; }
nav { display: flex; align-items: center; gap: 24px; font-size: 14px; }
.nav-app { background: var(--paper); border: 1px solid #b6c8ba; border-radius: 5px; min-height: 42px; padding: 8px 15px; font-weight: 650; text-decoration: none; }
.nav-app span { margin-left: 8px; }
.start { display: grid; grid-template-columns: .88fr 1.12fr; gap: 54px; padding: 54px 0 48px; align-items: center; }
.eyebrow { font-size: 14px; color: var(--muted); margin-bottom: 17px; }
h1 { font-size: clamp(32px, 3.9vw, 46px); font-weight: 850; letter-spacing: -1.7px; line-height: 1.25; }
.lead { font-size: 16px; line-height: 1.9; margin-top: 20px; color: #46544b; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 27px; background: var(--green); border: 1px solid #1c6137; color: white; text-decoration: none; padding: 11px 19px; min-height: 48px; border-radius: 5px; font-weight: 750; box-shadow: 0 2px 0 #1b5430; margin-top: 26px; }
.button:hover { color: white; background: #1b6037; }
.quiet { font-size: 12px; color: var(--muted); margin-top: 11px; }
.intro-note { font-size: 13px; color: var(--muted); margin-top: 26px; line-height: 1.8; }
.topic-workspace { min-width: 0; background: var(--paper); border: 1px solid #bacabd; border-radius: 8px; box-shadow: 0 3px 0 #e0e9e2; }
.workspace-heading { padding: 22px 24px 17px; }
.workspace-heading h2 { font-size: 23px; font-weight: 800; letter-spacing: -.5px; }
.workspace-heading p { color: var(--muted); font-size: 13px; margin-top: 3px; }
.topics { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; padding: 0 24px 22px; }
.topic { display: flex; flex-direction: column; gap: 9px; min-height: 99px; padding: 14px 15px; background: #fbfcfa; border: 1px solid var(--line); border-radius: 5px; text-decoration: none; transition: border-color .15s, background .15s; }
.topic:hover { border-color: #81a992; background: #f0f7f0; }
.topic-name { display: flex; justify-content: space-between; gap: 10px; align-items: center; font-weight: 750; font-size: 16px; text-decoration: none; }
.topic-name>span { text-decoration: none; color: #738579; font-weight: 400; font-size: 16px; }
.topic-description { font-size: 12px; line-height: 1.65; color: var(--muted); }
.custom-goal { border-top: 1px solid var(--line); background: #f9fbf8; padding: 17px 24px 18px; border-radius: 0 0 8px 8px; display: flex; align-items: center; gap: 15px; justify-content: space-between; }
.custom-goal strong { font-size: 13px; font-weight: 700; }
.custom-goal p { font-size: 12px; color: var(--muted); margin-top: 3px; }
.custom-goal a { font-size: 13px; font-weight: 700; flex-shrink: 0; min-height: 44px; display: flex; align-items: center; gap: 5px; }
.section { border-top: 1px solid var(--line); padding: 32px 0; }
.section-heading { display: flex; gap: 20px; align-items: center; justify-content: space-between; }
h2 { font-size: 21px; letter-spacing: -.5px; line-height: 1.4; font-weight: 800; }
.section-heading a { font-size: 13px; }
.steps { list-style: none; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 31px; margin: 27px 0 0; padding: 0; }
.steps li { display: flex; align-items: flex-start; gap: 12px; }
.step-number { display: grid; place-content: center; flex-shrink: 0; width: 27px; height: 27px; background: #fff; border: 1px solid #bdccc0; border-radius: 50%; font-size: 13px; font-weight: 700; }
h3 { font-size: 15px; font-weight: 750; margin-bottom: 6px; }
.steps p { font-size: 13px; line-height: 1.85; color: var(--muted); }
.notes { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 48px; padding: 32px 0 35px; }
.label { font-size: 12px; color: var(--muted); margin-bottom: 7px; }
.notes h2 { font-size: 20px; }
.notes article>p:not(.label) { font-size: 13px; line-height: 1.85; color: var(--muted); margin-top: 12px; }
.notes article>a { display: inline-flex; align-items: center; min-height: 44px; font-size: 13px; font-weight: 650; margin-top: 5px; }
.notes .storage-note { border-left: 2px solid #c0d2c4; padding-left: 12px; font-size: 12px!important; }
.faq-section { display: grid; grid-template-columns: .48fr 1fr; gap: 50px; padding-bottom: 35px; }
.faq { margin-top: -11px; min-width: 0; }
details { border-bottom: 1px solid var(--line); }
details:last-child { border: 0; }
summary { display: flex; justify-content: space-between; align-items: center; gap: 18px; list-style: none; cursor: pointer; padding: 14px 0; font-size: 14px; font-weight: 650; }
summary::-webkit-details-marker { display: none; }
summary:after { content: "+"; font-size: 20px; font-weight: 400; color: var(--blue); flex-shrink: 0; }
details[open] summary:after { content: "−"; }
details p { padding: 0 24px 16px 0; font-size: 13px; line-height: 1.9; color: var(--muted); }
footer { display: flex; gap: 25px; align-items: center; min-height: 85px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); }
footer>span { margin-right: auto; }
footer strong { font-weight: 750; color: var(--ink); }
footer a { min-height: 44px; display: inline-flex; align-items: center; }
@media(max-width:950px) {
  .shell { width: calc(100% - 40px); }
  .start { gap: 28px; grid-template-columns: .85fr 1.15fr; }
  .desktop-break { display: none; }
  .custom-goal { align-items: flex-start; flex-direction: column; gap: 2px; padding-block: 14px 10px; }
  .custom-goal a { min-height: 38px; }
  .topics { padding-inline: 18px; }
  .workspace-heading { padding-inline: 18px; }
  .custom-goal { padding-inline: 18px; }
  .topic { padding: 13px 12px; }
}
@media(max-width:700px) {
  .shell { width: calc(100% - 32px); }
  .top { min-height: 72px; gap: 12px; }
  .brand>span { font-size: 12px; padding-left: 8px; }
  .brand strong { font-size: 21px; }
  .brand img { width: 32px; height: 32px; }
  .brand { gap: 7px; }
  nav { gap: 0; }
  .nav-help { display: none; }
  .nav-app { font-size: 13px; padding: 9px 11px; min-height: 44px; }
  .nav-app span { margin-left: 2px; }
  .start { grid-template-columns: 1fr; gap: 26px; padding: 29px 0 30px; }
  .eyebrow { font-size: 12px; margin-bottom: 12px; }
  h1 { font-size: 36px; line-height: 1.25; letter-spacing: -1.3px; }
  .lead { font-size: 14px; line-height: 1.8; margin-top: 14px; max-width: 380px; }
  .button { font-size: 14px; margin-top: 20px; min-height: 46px; padding: 10px 16px; }
  .quiet { display: inline-block; font-size: 11px; margin: 11px 0 0 10px; }
  .intro-note { display: none; }
  .workspace-heading { padding: 18px 17px 15px; }
  .workspace-heading h2 { font-size: 21px; }
  .topics { padding: 0 16px 16px; gap: 9px; }
  .topic { min-height: 92px; padding: 12px; gap: 8px; }
  .topic-name { font-size: 15px; }
  .topic-description { font-size: 12px; }
  .custom-goal { padding: 14px 17px 10px; flex-direction: row; gap: 12px; align-items: center; }
  .custom-goal p { max-width: 160px; }
  .custom-goal a { font-size: 12px; min-height: 44px; }
  .section { padding: 26px 0; }
  .section-heading { display: block; }
  h2 { font-size: 20px; }
  .section-heading a { display: none; }
  .steps { grid-template-columns: 1fr; gap: 20px; margin-top: 22px; }
  .steps li { gap: 12px; }
  .steps p { font-size: 13px; max-width: 480px; }
  .notes { grid-template-columns: 1fr; gap: 27px; }
  .notes h2 { font-size: 19px; }
  .notes article>p:not(.label) { font-size: 13px; margin-top: 10px; }
  .faq-section { grid-template-columns: 1fr; gap: 22px; }
  summary { font-size: 13px; padding: 14px 0; min-height: 48px; }
  details p { padding-right: 12px; }
  footer { min-height: 78px; gap: 14px; font-size: 11px; }
  footer>a:last-child { display: none; }
}
@media(max-width:370px) {
  .shell { width: calc(100% - 28px); }
  .brand>span { display: none; }
  h1 { font-size: 32px; }
  .quiet { display: block; margin-left: 0; }
  .topic { padding: 10px; }
  .topics { padding-inline: 12px; gap: 8px; }
  .topic-description { font-size: 11px; }
  .custom-goal { flex-direction: column; align-items: flex-start; gap: 0; }
  .custom-goal p { max-width: none; }
}
@media(prefers-reduced-motion:reduce) { html { scroll-behavior: auto; } * { transition: none!important; } }