@charset "UTF-8";

:root {
  color-scheme: light;
  --paper: #f5f5ef;
  --ink: #253c32;
  --muted: #737b71;
  --line: #dfe2d7;
  --accent: #718264;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  color: var(--ink);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 32px; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--ink); outline-offset: 6px; border-radius: 2px; }
::selection { background: #d9e2ca; }
.page-shell { max-width: 1280px; min-height: 100svh; margin: 0 auto; padding: 0 64px; display: flex; flex-direction: column; }
.site-header { min-height: 112px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 16px; }
.brand-mark { font: 700 34px/1 Georgia, serif; letter-spacing: -3px; }
.brand-mark span { color: var(--accent); }
.brand-name { font-size: 15px; font-weight: 600; letter-spacing: 2px; border-left: 1px solid #ccd2c4; padding-left: 18px; }
nav { display: flex; align-items: center; gap: 36px; font-size: 13px; }
nav a { padding: 10px 0; color: #626d60; transition: color 160ms; }
nav a:hover, nav a[aria-current] { color: var(--ink); }
nav span { margin-left: 6px; }
main { flex: 1; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 32px; padding: 80px 0 88px; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin: 0 0 30px; font: 500 10px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 2px; color: #65765e; }
.eyebrow > span { width: 6px; height: 6px; background: #758864; border-radius: 50%; }
h1 { margin: 0; font-size: clamp(48px, 5.3vw, 70px); font-weight: 600; line-height: 1.4; letter-spacing: -2px; }
.title-accent { color: var(--accent); }
.hero-description { margin: 24px 0 0; font-size: 14px; line-height: 2; color: #6b756a; }
.hero-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 45px; margin-top: 34px; padding: 13px 18px; background: var(--ink); color: #fafbf5; font-size: 13px; border-radius: 3px; transition: background 160ms, transform 160ms; }
.hero-link:hover { background: #3b5342; transform: translateY(-2px); }
.hero-link span { font-size: 18px; }
.notebook-scene { position: relative; min-height: 400px; display: grid; place-items: center; isolation: isolate; }
.orbit { position: absolute; z-index: -1; width: 350px; height: 350px; border: 1px solid #e0e4d8; border-radius: 50%; }
.orbit-two { width: 275px; height: 275px; background: #eaece1; border: 0; }
.notebook { position: relative; width: 244px; height: 320px; border: 1px solid #b9c3a6; border-radius: 5px 12px 12px 5px; background: #dbe1ca; transform: rotate(-9deg); box-shadow: 5px 7px 0 -2px #f8f7ec, 6px 9px 0 -2px #b7bfa8, 17px 24px 35px -16px #45533646; }
.notebook-spine { position: absolute; left: 15px; top: 0; height: 100%; border-left: 1px solid #b9c4a5; box-shadow: -4px 0 7px #b2bea147; }
.notebook-content { padding: 30px 24px 24px 38px; height: 100%; display: flex; flex-direction: column; }
.notebook-kicker { font: 9px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 1.2px; color: #58694e; }
.notebook-title { margin-top: 29px; font-family: "Songti SC", "STSong", "SimSun", serif; font-size: 48px; line-height: 1.2; font-weight: 600; letter-spacing: 5px; }
.notebook-dot { color: #819067; }
.notebook-rule { margin-top: 22px; border-top: 1px solid #aebc9b; width: 36px; }
.notebook-caption { font-size: 10px; letter-spacing: 2px; margin-top: 14px; color: #5f6e53; }
.notebook-signature { margin-top: auto; font: 8px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 1px; color: #67735a; }
.bookmark { position: absolute; right: 30px; top: -1px; width: 15px; height: 53px; background: #677b54; clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 87%, 0 100%); }
.scene-plus { position: absolute; color: #8c9a7e; font: 20px/1 ui-monospace, monospace; }
.plus-one { left: 11%; top: 12%; }
.plus-two { right: 4%; bottom: 20%; font-size: 14px; }
.scene-caption { position: absolute; bottom: -12px; font: 9px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 2px; color: #939c8b; }
.about { border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr 2fr; gap: 30px; padding: 42px 0 52px; }
.section-label { font-size: 12px; line-height: 2; letter-spacing: 1px; }
.section-label span { margin-right: 16px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 10px; color: #909983; }
h2 { font-size: 21px; font-weight: 500; letter-spacing: 1px; line-height: 1.5; margin: 0 0 14px; }
.about-content > p { font-size: 13px; line-height: 2; color: #747c6f; margin: 0; }
.topics { padding: 0; margin: 24px 0 0; display: flex; flex-wrap: wrap; gap: 24px; list-style: none; }
.topics li { font-size: 11px; color: #5c6e51; }
.topics span { margin-right: 5px; color: #8c9d7b; }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 25px 0; border-top: 1px solid var(--line); font-size: 11px; line-height: 1.8; color: #737b71; }
.site-footer p { margin: 0; }
.icp-link:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.icp-link span { margin-left: 6px; }

@media (min-width: 1440px) {
  .hero { padding-top: 104px; padding-bottom: 112px; }
}

@media (max-width: 800px) {
  .page-shell { padding: 0 32px; }
  .site-header { min-height: 92px; }
  .hero { gap: 12px; padding: 64px 0; }
  h1 { font-size: 49px; }
  .hero-description { font-size: 12px; }
  .notebook { width: 205px; height: 280px; }
  .notebook-content { padding: 26px 18px 20px 32px; }
  .notebook-title { font-size: 42px; margin-top: 24px; }
  .notebook-kicker { font-size: 7px; }
  .orbit { width: 280px; height: 280px; }
  .orbit-two { width: 220px; height: 220px; }
  .about { grid-template-columns: 1fr 2.1fr; }
}

@media (max-width: 600px) {
  .page-shell { padding: 0 24px; }
  .site-header { min-height: 82px; }
  .brand { gap: 12px; }
  .brand-mark { font-size: 29px; }
  .brand-name { font-size: 12px; letter-spacing: 1px; padding-left: 12px; }
  nav { font-size: 11px; gap: 18px; }
  .nav-home { display: none; }
  .hero { grid-template-columns: 1fr; padding: 52px 0 40px; gap: 24px; }
  .eyebrow { font-size: 9px; margin-bottom: 22px; }
  h1 { font-size: clamp(42px, 11vw, 60px); line-height: 1.35; }
  .hero-description { font-size: 13px; margin-top: 22px; }
  .hero-link { margin-top: 26px; }
  .notebook-scene { min-height: 345px; margin: 0 0 18px; }
  .notebook { width: 210px; height: 280px; }
  .orbit { width: 310px; height: 310px; max-width: 100%; }
  .orbit-two { width: 240px; height: 240px; }
  .scene-caption { bottom: -5px; }
  .plus-one { left: 6%; }
  .plus-two { right: 3%; }
  .about { grid-template-columns: 1fr; padding: 30px 0 38px; gap: 22px; }
  h2 { font-size: 20px; }
  .about-content > p { font-size: 12px; }
  .topics { gap: 20px; }
  .site-footer { flex-direction: column; align-items: flex-start; gap: 7px; padding: 22px 0; font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}