:root {
  color-scheme: light;
  --paper: #f8f8f1;
  --ink: #10281f;
  --muted: #4c6257;
  --green: #276b4d;
  --line: #d8e2d7;
  --mist: #eaf4ea;
  --display: "Geist", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 16px/1.65 var(--display);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, textarea { font: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid #33815e; outline-offset: 4px; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-weight: 780; }
.shell { width: min(100% - 112px, 1248px); margin-inline: auto; }
.header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 86px;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}
.wordmark {
  width: fit-content;
  font: 850 36px/.94 "Geist", "Arial", sans-serif;
  letter-spacing: -.09em;
}
.wordmark span { color: var(--green); }
.header nav { display: flex; align-items: center; gap: clamp(24px, 3.2vw, 49px); }
.header nav a, .footer > a:last-child {
  font-weight: 620;
  font-size: 14px;
  color: var(--muted);
}
.header nav a:hover, .footer > a:last-child:hover { color: var(--ink); text-decoration: underline; }
.button {
  width: fit-content;
  min-height: 49px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 18px;
  border: 1px solid transparent;
  border-radius: 100px;
  padding: 10px 20px;
  font-weight: 710;
  font-size: 14px;
  transition: background-color 160ms ease, border-color 160ms ease;
}
.button span { font-size: 17px; line-height: 1; }
.button-primary { background: #173c2e; color: #fff; }
.button-primary:hover { background: #275c46; }
.button-outline { border-color: #9db4a4; color: var(--ink); background: transparent; }
.button-outline:hover { background: #e4efe4; border-color: #71927e; }
.header-action { justify-self: end; min-height: 40px; padding: 6px 15px; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, .83fr) minmax(0, 1.17fr);
  gap: clamp(24px, 5vw, 76px);
  align-items: center;
  padding-block: 48px 58px;
}
.hero-copy { padding-block: 8px; }
.eyebrow {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--green);
  font-size: 13px;
  font-weight: 720;
  letter-spacing: .08em;
}
.status-dot { flex: 0 0 8px; height: 8px; border-radius: 50%; background: #33815e; }
h1 {
  margin: 24px 0;
  font-size: clamp(54px, 6.5vw, 94px);
  line-height: 1.055;
  letter-spacing: -.066em;
}
.period { color: var(--green); }
.intro { max-width: 390px; margin-bottom: 29px; color: var(--muted); line-height: 1.8; }
.hero-art { overflow: hidden; border-radius: 24px; background: #90c9ad; height: clamp(430px, 40vw, 562px); }
.hero-art img { width: 100%; height: 100%; object-fit: cover; object-position: 59% center; display: block; }
.examples, .guide { border-top: 1px solid var(--line); padding-block: 48px 68px; scroll-margin-top: 22px; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 26px; }
.section-head h2 { margin-top: 11px; font-size: clamp(31px, 4vw, 53px); line-height: 1.18; letter-spacing: -.049em; }
.section-head > p { max-width: 365px; color: var(--muted); font-size: 15px; }
.studio { background: #edf4eb; border: 1px solid var(--line); border-radius: 24px; padding: 19px; }
.scenario-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.scenario-tabs button {
  min-height: 43px;
  min-width: 76px;
  padding: 5px 20px;
  border: 1px solid transparent;
  border-radius: 99px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}
.scenario-tabs button:hover { border-color: #acbfaf; }
.scenario-tabs button[aria-selected="true"] { background: #173c2e; color: white; }
.scenario-panel {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  min-width: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 17px;
  overflow: hidden;
}
.scenario-prompt, .scenario-output { min-width: 0; padding: clamp(20px, 3.1vw, 44px); }
.scenario-prompt h3 { margin-bottom: 20px; font-size: clamp(23px, 2.3vw, 32px); line-height: 1.25; }
.prompt-label, .output-label { display: block; font-size: 13px; font-weight: 740; color: var(--green); }
#prompt-text {
  width: 100%;
  min-height: 113px;
  margin: 8px 0 12px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background: #f7f9f5;
  line-height: 1.65;
  resize: vertical;
}
.prompt-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.prompt-actions button { min-height: 42px; }
#copy-feedback { color: var(--green); font-size: 13px; }
.scenario-output { background: #e2f1e6; border-left: 1px solid var(--line); }
.sample-context { margin-block: 15px 17px; color: var(--muted); font-size: 14px; }
.sample-answer { border-top: 1px solid #bcd5c2; padding-top: 13px; }
.sample-answer p + p { margin-top: 6px; }
.guide { padding-bottom: 55px; }
.steps { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; }
.steps li { padding: 24px 25px 28px 0; border-top: 1px solid var(--line); }
.steps li + li { padding-left: 25px; border-left: 1px solid var(--line); }
.step-number { font-size: 13px; font-weight: 750; color: var(--green); font-variant-numeric: tabular-nums; }
.steps h3 { margin-block: 7px 3px; font-size: 20px; }
.steps p { color: var(--muted); font-size: 14px; }
.next-action { padding-top: 14px; }
.footer { display: flex; justify-content: space-between; align-items: center; min-height: 95px; border-top: 1px solid var(--line); }
.footer .wordmark { font-size: 30px; }
@media (max-width: 960px) {
  .shell { width: min(100% - 64px, 1248px); }
  .hero { gap: 27px; }
  h1 { font-size: clamp(51px, 7.1vw, 72px); }
  .hero-art { height: clamp(395px, 52vw, 530px); }
}
@media (max-width: 690px) {
  .shell { width: calc(100% - 36px); }
  .header { min-height: 66px; grid-template-columns: auto 1fr; gap: 16px; }
  .wordmark { font-size: 32px; }
  .header nav { justify-content: end; gap: 18px; }
  .header nav a { font-size: 13px; }
  .header-action { display: none; }
  .hero { grid-template-columns: minmax(0, 1fr); gap: 24px; padding-block: 27px 36px; }
  h1 { font-size: clamp(46px, 10.9vw, 67px); margin-block: 16px 18px; }
  .desktop-break { display: none; }
  .intro { margin-bottom: 19px; font-size: 15px; }
  .hero-art { height: auto; aspect-ratio: 1.35; border-radius: 17px; }
  .examples, .guide { padding-block: 31px 42px; }
  .section-head { align-items: start; flex-direction: column; gap: 10px; margin-bottom: 20px; }
  .studio { padding: 10px; border-radius: 17px; }
  .scenario-tabs { margin-bottom: 10px; }
  .scenario-panel { grid-template-columns: minmax(0, 1fr); }
  .scenario-output { border-left: 0; border-top: 1px solid var(--line); }
  .steps { grid-template-columns: 1fr; }
  .steps li, .steps li + li { padding: 15px 0 17px; border-left: 0; }
  .footer { min-height: 74px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}