@import url('data:text/css,');

:root {
  --ink: #253052;
  --muted: #68708a;
  --paper: #fffdf8;
  --surface: #f5f2e9;
  --surface-2: #ede9de;
  --line: #dcd8cc;
  --blue: #4968c5;
  --blue-deep: #314da3;
  --blue-soft: #e8edff;
  --coral: #e87963;
  --amber: #e7a43f;
  --green: #48977b;
  --sky: #4d9fbd;
  --violet: #8069b6;
  --shadow: 0 18px 50px rgba(45, 54, 88, .1);
  --radius: 22px;
  --font-sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: Georgia, "Noto Serif SC", "Songti SC", serif;
}

:root[data-theme="dark"] {
  --ink: #edf0ff;
  --muted: #aeb6d0;
  --paper: #161a29;
  --surface: #1e2335;
  --surface-2: #282e43;
  --line: #353d58;
  --blue: #8ba1f0;
  --blue-deep: #b2c0ff;
  --blue-soft: #263356;
  --shadow: 0 18px 50px rgba(0, 0, 0, .25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--font-sans); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 3px solid rgba(73, 104, 197, .35); outline-offset: 3px; }
[hidden] { display: none !important; }

.topbar { position: sticky; top: 0; z-index: 50; height: 76px; padding: 0 4vw; display: flex; align-items: center; justify-content: space-between; background: color-mix(in srgb, var(--paper) 90%, transparent); border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent); backdrop-filter: blur(16px); }
.brand { display: inline-flex; align-items: center; gap: 12px; line-height: 1.1; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; color: white; font-family: var(--font-serif); font-size: 23px; font-weight: 700; background: var(--blue); border-radius: 12px 12px 4px 12px; transform: rotate(-3deg); box-shadow: 0 7px 16px rgba(73,104,197,.22); }
.brand b { display: block; font-size: 14px; letter-spacing: .02em; }
.brand small { display: block; margin-top: 4px; color: var(--muted); font-size: 10px; letter-spacing: .16em; text-transform: uppercase; }
.top-actions { display: flex; align-items: center; gap: 8px; }
.home-link { padding: 8px 12px; color: var(--muted); font-size: 14px; font-weight: 700; }
.home-link:hover { color: var(--blue); }
.icon-button { width: 40px; height: 40px; border: 1px solid var(--line); color: var(--ink); background: var(--paper); border-radius: 50%; cursor: pointer; transition: .2s; }
.icon-button:hover { border-color: var(--blue); color: var(--blue); transform: translateY(-1px); }
.menu-toggle { display: none; }

.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--blue-deep); font-size: 12px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 24px; height: 2px; background: currentColor; }

.home-hero { min-height: 660px; padding: 86px max(6vw, calc((100vw - 1280px)/2)); display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); align-items: center; gap: 7vw; background: radial-gradient(circle at 88% 20%, rgba(255,190,85,.24), transparent 22%), radial-gradient(circle at 8% 74%, rgba(73,104,197,.12), transparent 24%), var(--paper); overflow: hidden; }
.hero-copy h1 { margin: 24px 0 22px; font-family: var(--font-serif); font-size: clamp(48px, 6.4vw, 88px); font-weight: 500; line-height: 1.05; letter-spacing: -.055em; }
.hero-copy h1 strong { color: var(--blue); font-weight: 500; }
.hero-copy p { max-width: 600px; margin: 0; color: var(--muted); font-size: 18px; line-height: 1.9; }
.hero-actions { margin-top: 34px; display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.primary-button { padding: 14px 22px; color: white; background: var(--blue); border-radius: 10px; font-weight: 800; box-shadow: 0 10px 24px rgba(73,104,197,.24); transition: .2s; }
.primary-button:hover { background: var(--blue-deep); transform: translateY(-2px); }
.text-button { color: var(--ink); font-weight: 750; }
.text-button:hover { color: var(--blue); }

.mission-board { position: relative; width: min(100%, 500px); aspect-ratio: 1.12; justify-self: end; background: #cfa66f; background-image: radial-gradient(#b58a53 1px, transparent 1px); background-size: 14px 14px; border: 12px solid #7a5336; border-radius: 10px; box-shadow: 18px 24px 0 rgba(73,104,197,.12), var(--shadow); transform: rotate(1.5deg); }
.board-note { position: absolute; padding: 28px; background: #fff8d7; color: #31395b; box-shadow: 0 10px 25px rgba(45,38,26,.2); }
.board-note span { color: #d76155; font-size: 11px; font-weight: 900; letter-spacing: .18em; }
.note-one { top: 11%; left: 8%; width: 47%; transform: rotate(-4deg); }
.note-one b { display: block; margin-top: 7px; font-family: var(--font-serif); font-size: clamp(24px, 3.2vw, 38px); line-height: 1; }
.note-two { right: 6%; bottom: 11%; width: 48%; background: #e5efff; transform: rotate(4deg); }
.note-two p { margin: 12px 0 0; font-family: var(--font-serif); font-size: clamp(19px, 2.4vw, 28px); line-height: 1.25; }
.board-tape { position: absolute; width: 78px; height: 20px; background: rgba(255,255,255,.62); box-shadow: 0 2px 5px rgba(0,0,0,.08); }
.tape-one { left: 23%; top: 7%; transform: rotate(1deg); }
.tape-two { right: 20%; bottom: 7%; transform: rotate(-2deg); }
.board-robot { position: absolute; right: 9%; top: 12%; width: 105px; height: 122px; display: grid; place-items: center; color: #fff; background: #4d65b5; border: 7px solid #31447e; border-radius: 22px; transform: rotate(4deg); }
.board-robot::before, .board-robot::after { content: ""; position: absolute; top: 36px; width: 13px; height: 13px; background: #ffdb66; border-radius: 50%; }
.board-robot::before { left: 22px; }.board-robot::after { right: 22px; }
.board-robot i { position: absolute; top: -25px; width: 3px; height: 25px; background: #31447e; }
.board-robot i::before { content: ""; position: absolute; width: 11px; height: 11px; left: -4px; top: -6px; border-radius: 50%; background: #ed725f; }
.board-robot b { align-self: end; margin-bottom: 16px; font-size: 11px; letter-spacing: .18em; }

.stats-strip { max-width: 1180px; margin: -34px auto 0; position: relative; z-index: 2; display: grid; grid-template-columns: repeat(4,1fr); background: var(--blue); color: white; border-radius: 18px; box-shadow: 0 18px 40px rgba(57,78,150,.26); overflow: hidden; }
.stats-strip div { padding: 25px 30px; display: flex; align-items: baseline; gap: 13px; border-right: 1px solid rgba(255,255,255,.2); }
.stats-strip div:last-child { border: 0; }
.stats-strip b { font-family: var(--font-serif); font-size: 34px; line-height: 1; }
.stats-strip span { font-size: 12px; font-weight: 700; opacity: .82; }

.learning-path, .chapter-section, .use-guide { max-width: 1240px; margin: 0 auto; padding: 112px 30px; }
.section-heading { max-width: 720px; margin-bottom: 48px; }
.section-heading > span { color: var(--blue); font-size: 11px; font-weight: 900; letter-spacing: .18em; }
.section-heading h2, .use-guide h2 { margin: 12px 0 12px; font-family: var(--font-serif); font-size: clamp(32px, 4vw, 52px); font-weight: 500; line-height: 1.2; letter-spacing: -.03em; }
.section-heading p, .use-guide p { margin: 0; color: var(--muted); font-size: 16px; }
.section-heading.compact { margin-bottom: 26px; }
.path-track { position: relative; display: grid; grid-template-columns: repeat(5,1fr); gap: 0; }
.path-track::before { content: ""; position: absolute; top: 25px; left: 8%; right: 8%; height: 2px; background: var(--line); }
.path-track div { position: relative; text-align: center; }
.path-track span { width: 50px; height: 50px; margin: 0 auto 14px; display: grid; place-items: center; position: relative; z-index: 1; color: var(--blue); background: var(--paper); border: 2px solid var(--blue); border-radius: 50%; font-family: var(--font-serif); font-size: 20px; font-weight: 700; }
.path-track b, .path-track small { display: block; }
.path-track b { font-size: 15px; }.path-track small { color: var(--muted); font-size: 11px; }

.chapter-section { padding-top: 34px; }
.chapter-search { max-width: 620px; height: 54px; margin-bottom: 34px; padding: 0 16px; display: flex; align-items: center; gap: 11px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.chapter-search span { color: var(--blue); font-size: 24px; transform: rotate(-20deg); }
.chapter-search input { min-width: 0; flex: 1; color: var(--ink); background: transparent; border: 0; outline: 0; }
.chapter-search input::placeholder { color: var(--muted); }
.chapter-search small { color: var(--muted); white-space: nowrap; }
.chapter-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; }
.chapter-card { min-height: 245px; padding: 22px; display: flex; flex-direction: column; position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; transition: .22s ease; }
.chapter-card::after { content: ""; position: absolute; width: 90px; height: 90px; right: -46px; bottom: -46px; background: var(--accent); border-radius: 50%; opacity: .16; transition: .22s; }
.chapter-card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); box-shadow: var(--shadow); }
.chapter-card:hover::after { transform: scale(1.7); }
.card-top { display: flex; justify-content: space-between; align-items: center; }
.card-top span { color: var(--accent); font-family: var(--font-serif); font-size: 27px; font-weight: 700; }
.card-top em { color: var(--muted); font-size: 10px; font-style: normal; font-weight: 800; letter-spacing: .12em; }
.chapter-card h3 { margin: 24px 0 10px; font-family: var(--font-serif); font-size: 22px; line-height: 1.2; }
.chapter-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.chapter-card > b { margin-top: auto; padding-top: 20px; color: var(--accent); font-size: 12px; }
.chapter-card > b span { transition: .2s; }.chapter-card:hover > b span { margin-left: 5px; }
.coral { --accent: var(--coral); }.amber { --accent: var(--amber); }.green { --accent: var(--green); }.sky { --accent: var(--sky); }.blue { --accent: var(--blue); }.violet { --accent: var(--violet); }
.empty-state { padding: 45px; text-align: center; color: var(--muted); background: var(--surface); border-radius: 16px; }

.use-guide { margin-bottom: 96px; display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; background: var(--surface); border-radius: 26px; }
.use-guide > div { padding-left: 28px; }
.use-guide ol { margin: 0; padding: 0; list-style: none; counter-reset: guide; }
.use-guide li { padding: 18px 0; display: grid; grid-template-columns: 40px 1fr; column-gap: 16px; border-bottom: 1px solid var(--line); counter-increment: guide; }
.use-guide li::before { content: "0" counter(guide); grid-row: 1 / span 2; color: var(--blue); font-family: var(--font-serif); font-size: 23px; }
.use-guide li b { font-size: 15px; }.use-guide li span { color: var(--muted); font-size: 13px; }

.site-footer { min-height: 100px; padding: 30px 4vw; display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--muted); background: var(--surface); border-top: 1px solid var(--line); font-size: 12px; }
.site-footer a { color: var(--blue); font-weight: 800; }

.reading-progress { position: fixed; z-index: 70; left: 0; right: 0; top: 0; height: 3px; background: transparent; }
.reading-progress span { display: block; width: 0; height: 100%; background: var(--coral); }
.page-grid { max-width: 1540px; margin: 0 auto; display: grid; grid-template-columns: 250px minmax(0, 850px) 190px; gap: 38px; padding: 38px 28px 90px; align-items: start; }
.chapter-nav { position: sticky; top: 100px; max-height: calc(100vh - 125px); overflow: auto; scrollbar-width: thin; }
.nav-heading { padding: 0 10px 15px; border-bottom: 1px solid var(--line); }
.nav-heading span, .nav-heading b { display: block; }
.nav-heading span { color: var(--muted); font-size: 11px; }.nav-heading b { font-family: var(--font-serif); font-size: 21px; }
.nav-list { padding: 10px 0; }
.nav-list a { padding: 8px 10px; display: grid; grid-template-columns: 28px 1fr; align-items: baseline; gap: 5px; color: var(--muted); border-radius: 8px; }
.nav-list a:hover { color: var(--blue); background: var(--surface); }
.nav-list a.active { color: var(--blue-deep); background: var(--blue-soft); font-weight: 800; }
.nav-list span { font-size: 10px; font-weight: 900; }.nav-list em { overflow: hidden; font-size: 11px; font-style: normal; text-overflow: ellipsis; white-space: nowrap; }

.chapter-main { min-width: 0; }
.chapter-hero { min-height: 260px; padding: 42px 46px; display: flex; align-items: center; justify-content: space-between; gap: 25px; position: relative; color: white; background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 86%, #24345f), color-mix(in srgb, var(--accent) 55%, #293965)); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.chapter-hero::before { content: ""; position: absolute; width: 280px; height: 280px; right: -120px; top: -110px; border: 1px solid rgba(255,255,255,.25); border-radius: 50%; box-shadow: 0 0 0 34px rgba(255,255,255,.05), 0 0 0 68px rgba(255,255,255,.04); }
.chapter-hero > div:first-child { position: relative; z-index: 1; }
.chapter-hero .eyebrow { color: rgba(255,255,255,.78); }
.chapter-hero h1 { max-width: 600px; margin: 18px 0 12px; font-family: var(--font-serif); font-size: clamp(34px, 5vw, 54px); font-weight: 500; line-height: 1.05; letter-spacing: -.04em; }
.chapter-hero p { max-width: 590px; margin: 0; color: rgba(255,255,255,.8); font-size: 14px; }
.chapter-orbit { min-width: 105px; height: 105px; display: grid; place-items: center; position: relative; z-index: 1; border: 1px solid rgba(255,255,255,.45); border-radius: 50%; }
.chapter-orbit::before, .chapter-orbit::after { content: ""; position: absolute; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; }
.chapter-orbit::before { inset: -12px; }.chapter-orbit::after { inset: 12px; }
.chapter-orbit span { font-family: var(--font-serif); font-size: 33px; }
.chapter-toolbar { margin: 18px 4px 0; padding: 12px 0 18px; display: flex; align-items: center; justify-content: space-between; gap: 15px; color: var(--muted); border-bottom: 1px solid var(--line); font-size: 11px; }
.print-button { padding: 7px 12px; color: var(--blue); background: transparent; border: 1px solid color-mix(in srgb, var(--blue) 45%, var(--line)); border-radius: 8px; cursor: pointer; font-weight: 800; }
.print-button:hover { color: white; background: var(--blue); }

.manual-content { padding: 28px 4px 20px; font-size: 15px; }
.manual-content h2 { margin: 58px 0 18px; padding-top: 4px; font-family: var(--font-serif); font-size: 29px; font-weight: 600; line-height: 1.35; letter-spacing: -.015em; }
.manual-content h2:first-child { margin-top: 14px; }
.manual-content h2::before { content: ""; width: 7px; height: 7px; margin-right: 12px; display: inline-block; vertical-align: .22em; background: var(--blue); border-radius: 50%; }
.manual-content h3 { margin: 32px 0 12px; color: var(--blue-deep); font-size: 18px; }
.manual-content h4 { margin: 26px 0 10px; font-size: 16px; }
.manual-content p { margin: 12px 0; }
.manual-content strong { color: var(--ink); }
.manual-content code { padding: .16em .42em; color: color-mix(in srgb, var(--blue-deep) 86%, var(--ink)); background: var(--blue-soft); border-radius: 5px; font-family: "SFMono-Regular", Consolas, monospace; font-size: .9em; }
.manual-content ul, .manual-content ol { margin: 14px 0; padding-left: 24px; }
.manual-content li { margin: 8px 0; padding-left: 4px; }
.manual-content li::marker { color: var(--blue); font-weight: 800; }
.table-wrap { width: 100%; margin: 20px 0 28px; overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.manual-content table { width: 100%; border-collapse: collapse; font-size: 13px; }
.manual-content th { padding: 12px 14px; color: var(--blue-deep); background: var(--blue-soft); text-align: left; white-space: nowrap; }
.manual-content td { padding: 11px 14px; border-top: 1px solid var(--line); vertical-align: top; }
.manual-content tr:nth-child(even) td { background: color-mix(in srgb, var(--surface) 55%, transparent); }
.manual-content a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
.manual-content blockquote { margin: 20px 0; padding: 16px 20px; color: var(--ink); background: var(--blue-soft); border-left: 4px solid var(--blue); border-radius: 0 10px 10px 0; font-family: var(--font-serif); }

.page-toc { position: sticky; top: 104px; max-height: calc(100vh - 130px); overflow: auto; }
.page-toc b { display: block; margin-bottom: 12px; color: var(--muted); font-size: 9px; letter-spacing: .17em; }
.page-toc a { padding: 5px 0 5px 10px; display: block; color: var(--muted); border-left: 1px solid var(--line); font-size: 10px; line-height: 1.4; }
.page-toc a:hover, .page-toc a.current { color: var(--blue); border-left: 2px solid var(--blue); }
.page-turn { margin-top: 45px; padding-top: 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 15px; border-top: 1px solid var(--line); }
.page-turn a { padding: 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; transition: .2s; }
.page-turn a:hover { border-color: var(--blue); transform: translateY(-2px); }
.page-turn small, .page-turn span { display: block; }.page-turn small { color: var(--muted); font-size: 10px; }.page-turn span { margin-top: 5px; color: var(--blue-deep); font-family: var(--font-serif); font-size: 14px; }
.page-turn .next { text-align: right; }
.mobile-backdrop { display: none; }

@media (max-width: 1180px) {
  .chapter-grid { grid-template-columns: repeat(3,1fr); }
  .page-grid { grid-template-columns: 210px minmax(0,1fr); }
  .page-toc { display: none; }
}

@media (max-width: 900px) {
  .home-hero { min-height: auto; padding-top: 70px; grid-template-columns: 1fr; }
  .mission-board { width: min(90%, 520px); justify-self: center; }
  .stats-strip { margin: 0; border-radius: 0; grid-template-columns: repeat(2,1fr); }
  .stats-strip div:nth-child(2) { border-right: 0; }.stats-strip div:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.2); }
  .chapter-grid { grid-template-columns: repeat(2,1fr); }
  .use-guide { margin: 0 22px 70px; padding: 55px 35px; grid-template-columns: 1fr; gap: 35px; }
  .use-guide > div { padding-left: 0; }
  .page-grid { display: block; padding: 22px 22px 70px; }
  .chapter-nav { width: min(86vw, 320px); height: 100vh; max-height: none; padding: 96px 18px 25px; position: fixed; z-index: 60; left: 0; top: 0; background: var(--paper); border-right: 1px solid var(--line); transform: translateX(-105%); transition: .25s; }
  .nav-open .chapter-nav { transform: translateX(0); }
  .mobile-backdrop { display: block; position: fixed; z-index: 55; inset: 0; background: rgba(20,25,43,.48); opacity: 0; pointer-events: none; transition: .25s; }
  .nav-open .mobile-backdrop { opacity: 1; pointer-events: auto; }
  .menu-toggle { display: inline-grid; place-items: center; }
}

@media (max-width: 620px) {
  .topbar { height: 68px; padding: 0 18px; }.brand small { display: none; }.brand b { font-size: 12px; }.home-link { display: none; }
  .home-hero { padding: 56px 22px 65px; gap: 55px; }.hero-copy h1 { font-size: 49px; }.hero-copy p { font-size: 15px; }
  .mission-board { width: 100%; border-width: 8px; }.board-note { padding: 18px; }.board-robot { width: 76px; height: 90px; }
  .stats-strip div { padding: 21px 16px; display: block; }.stats-strip b, .stats-strip span { display: block; }.stats-strip span { margin-top: 6px; }
  .learning-path, .chapter-section { padding: 78px 20px; }.path-track { grid-template-columns: 1fr; gap: 18px; }.path-track::before { left: 24px; right: auto; top: 0; bottom: 0; width: 2px; height: auto; }.path-track div { display: grid; grid-template-columns: 50px 1fr; gap: 15px; text-align: left; }.path-track span { grid-row: 1 / span 2; margin: 0; }.path-track b { align-self: end; }.path-track small { align-self: start; }
  .chapter-grid { grid-template-columns: 1fr; }.chapter-search small { display: none; }
  .use-guide { margin: 0 0 50px; padding: 55px 22px; border-radius: 0; }.site-footer { align-items: flex-start; flex-direction: column; }
  .page-grid { padding: 14px 12px 60px; }.chapter-hero { min-height: 250px; padding: 32px 26px; }.chapter-orbit { display: none; }.chapter-hero h1 { font-size: 37px; }.chapter-toolbar span { display: none; }.chapter-toolbar { justify-content: flex-end; }
  .manual-content { padding-left: 8px; padding-right: 8px; font-size: 14px; }.manual-content h2 { font-size: 24px; }.manual-content h3 { font-size: 17px; }.manual-content th, .manual-content td { min-width: 110px; padding: 10px; }
  .page-turn { grid-template-columns: 1fr; }.page-turn .next { text-align: left; }
}

@media print {
  :root { --ink: #111; --muted: #444; --paper: #fff; --surface: #fff; --line: #bbb; --blue: #3453a4; --blue-deep: #273f80; --blue-soft: #eef1fa; }
  body { font-size: 10pt; }
  .topbar, .chapter-nav, .page-toc, .reading-progress, .chapter-toolbar, .page-turn, .site-footer, .mobile-backdrop { display: none !important; }
  .page-grid { display: block; max-width: none; padding: 0; }
  .chapter-hero { min-height: 0; margin: 0 0 18mm; padding: 16mm; color: #111; background: #eef1fa !important; border: 1px solid #9aa8ce; box-shadow: none; break-after: page; }
  .chapter-hero .eyebrow, .chapter-hero p { color: #333; }.chapter-hero::before, .chapter-orbit { display: none; }
  .manual-content { padding: 0; }
  .manual-content h2 { margin-top: 9mm; break-after: avoid; }.manual-content h3 { break-after: avoid; }
  .table-wrap { overflow: visible; break-inside: avoid; }.manual-content table { font-size: 8.5pt; }
  .manual-content p, .manual-content li { orphans: 3; widows: 3; }
  @page { size: A4; margin: 17mm 15mm 18mm; }
}