:root {
  --ink: #211821;
  --ink-soft: #5e505d;
  --paper: #f7f1e9;
  --paper-strong: #fffdf9;
  --blue: #7b3145;
  --blue-deep: #20131f;
  --red: #b5533f;
  --yellow: #d6a861;
  --line: rgba(33, 24, 33, 0.18);
  --max: 1180px;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --serif: "Iowan Old Style", "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input { font: inherit; }
::selection { background: var(--yellow); color: var(--ink); }

.site-shell { min-height: 100vh; overflow: hidden; }
.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; background: white; padding: .7rem 1rem; }
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(18px);
}
.nav-wrap { height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: inline-flex; align-items: center; gap: .8rem; font-weight: 750; letter-spacing: -.02em; }
.brand-mark { width: 22px; height: 22px; border: 2px solid var(--ink); border-radius: 50%; position: relative; }
.brand-mark::after { content: ""; position: absolute; width: 12px; height: 2px; background: var(--red); right: -8px; top: 8px; transform: rotate(-35deg); }
.nav-links { display: flex; align-items: center; gap: 1.6rem; }
.nav-link { color: var(--ink-soft); font-size: .9rem; font-weight: 650; }
.nav-link:hover, .nav-link[aria-current="page"] { color: var(--blue); }
.menu-button { display: none; background: none; border: 0; padding: .5rem; color: var(--ink); }

.hero { padding: 70px 0 46px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(340px, .78fr); gap: 76px; align-items: center; }
.eyebrow { margin: 0 0 1.25rem; color: var(--blue); font-size: .76rem; line-height: 1.2; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.hero h1, .page-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.5rem, 7.3vw, 6.8rem);
  line-height: .98;
  letter-spacing: -.07em;
  font-weight: 600;
}
.hero h1 span { display: block; }
.hero h1 span:last-child { margin-left: 8%; color: var(--blue); }
.hero-copy { max-width: 620px; margin: 2rem 0 0; font-size: 1.1rem; color: var(--ink-soft); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: .7rem 1.05rem; border: 1px solid var(--ink); font-size: .9rem; font-weight: 750; transition: transform .2s ease, background .2s ease, color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--ink); color: white; }
.button-primary:hover { background: var(--blue); border-color: var(--blue); }
.portrait-wrap { position: relative; padding: 18px 22px 0 0; }
.portrait-wrap::before { content: ""; position: absolute; inset: 0 0 12% 15%; border: 1px solid var(--red); transform: rotate(2.5deg); }
.hero-art { position: relative; margin: 0; overflow: hidden; box-shadow: 18px 22px 0 rgba(123, 49, 69, .13); }
.hero-art::before { content: ""; position: absolute; inset: 0; border: 1px solid rgba(255,255,255,.24); z-index: 1; }
.hero-art img { width: 100%; object-fit: cover; }
.hero-portrait img { aspect-ratio: 4 / 5; object-position: 50% 56%; }
.image-note { position: relative; display: flex; justify-content: space-between; gap: 1rem; margin: 1.05rem 0 0; color: var(--ink-soft); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; }
.image-note span:first-child { color: var(--blue); font-weight: 850; }

.signal-strip { margin-top: 44px; border-block: 1px solid var(--line); }
.signal-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.signal { min-height: 128px; padding: 1.5rem 1.4rem; border-right: 1px solid var(--line); }
.signal:first-child { border-left: 1px solid var(--line); }
.signal-label { color: var(--blue); font-size: .72rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.signal p { margin: .65rem 0 0; max-width: 30ch; font-family: var(--serif); font-size: 1.12rem; line-height: 1.5; }

.section { padding: 90px 0; }
.section-dark { background: var(--blue-deep); color: white; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 2rem; margin-bottom: 2.5rem; }
.section-kicker { margin: 0 0 .45rem; color: var(--red); font-size: .74rem; font-weight: 800; letter-spacing: .14em; }
.section-title { margin: 0; font-family: var(--serif); font-size: clamp(2.2rem, 5vw, 4.4rem); line-height: 1; letter-spacing: -.055em; font-weight: 600; }
.text-link { display: inline-block; border-bottom: 1px solid currentColor; color: var(--blue); font-size: .86rem; font-weight: 750; }
.section-dark .text-link { color: #9bb7ff; }

.learning-list { border-top: 1px solid var(--line); }
.learning-item { display: grid; grid-template-columns: 126px minmax(0, 1fr) auto; gap: 2rem; align-items: start; padding: 1.55rem 0; border-bottom: 1px solid var(--line); }
.learning-item:hover .learning-title { color: var(--blue); }
.learning-date { color: var(--ink-soft); font-size: .82rem; font-variant-numeric: tabular-nums; }
.learning-title { margin: 0; font-family: var(--serif); font-size: 1.4rem; line-height: 1.28; letter-spacing: -.025em; transition: color .2s ease; }
.learning-summary { max-width: 720px; margin: .45rem 0 0; color: var(--ink-soft); font-size: .9rem; }
.tag-row { display: flex; flex-wrap: wrap; gap: .45rem; justify-content: flex-end; }
.tag { padding: .2rem .55rem; border: 1px solid var(--line); color: var(--ink-soft); font-size: .72rem; line-height: 1.5; }

.project-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 1px; background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.18); }
.project-card { min-height: 320px; padding: 2rem; background: var(--blue-deep); display: flex; flex-direction: column; }
.project-index { color: #dfac8a; font-size: .75rem; font-weight: 800; letter-spacing: .13em; }
.project-card h3 { margin: auto 0 .7rem; font-family: var(--serif); font-size: clamp(2rem, 4vw, 3.7rem); line-height: 1; letter-spacing: -.045em; font-weight: 600; }
.project-card p { max-width: 44ch; margin: 0; color: #cbd5ea; }
.project-meta { display: flex; gap: .6rem; margin-top: 1.25rem; color: #dfac8a; font-size: .74rem; }

.about-grid { display: grid; grid-template-columns: .75fr 1.25fr; gap: 80px; align-items: start; }
.about-statement { margin: 0; font-family: var(--serif); font-size: clamp(2.2rem, 4.5vw, 4.3rem); line-height: 1.04; letter-spacing: -.05em; }
.about-copy { max-width: 650px; color: var(--ink-soft); font-size: 1.05rem; }
.about-copy p:first-child { margin-top: 0; }
.profile-grid { display: grid; grid-template-columns: minmax(280px, .72fr) minmax(0, 1.28fr); gap: 80px; align-items: start; }
.profile-photo { margin: 0; position: sticky; top: 106px; overflow: hidden; border: 1px solid var(--line); box-shadow: 16px 18px 0 rgba(123, 49, 69, .12); }
.profile-photo img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; object-position: 50% 56%; }
.profile-grid .about-copy { margin-top: 2rem; }
.profile-grid .about-copy .button { margin-top: 1.25rem; }
.roadmap { margin-top: 3rem; display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.roadmap-item { min-height: 138px; padding: 1.2rem; border-right: 1px solid var(--line); }
.roadmap-item:last-child { border-right: 0; }
.roadmap-item small { color: var(--red); font-weight: 800; }
.roadmap-item strong { display: block; margin-top: 1.6rem; font-family: var(--serif); font-size: 1.1rem; }

.page-hero { padding: 86px 0 50px; border-bottom: 1px solid var(--line); }
.page-hero-grid { display: grid; grid-template-columns: 1fr .72fr; gap: 80px; align-items: end; }
.page-title { font-size: clamp(4rem, 9vw, 8rem); }
.page-intro { margin: 0; max-width: 48ch; color: var(--ink-soft); font-size: 1.08rem; }
.filter-bar { display: flex; gap: .8rem; align-items: center; margin: 2rem 0; }
.search-input { width: min(100%, 420px); min-height: 46px; padding: .65rem .9rem; border: 1px solid var(--line); background: var(--paper-strong); color: var(--ink); outline: none; }
.search-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(23,70,209,.12); }
.result-count { color: var(--ink-soft); font-size: .82rem; }
.empty-state { padding: 4rem 0; color: var(--ink-soft); }

.article-shell { width: min(calc(100% - 40px), 800px); margin-inline: auto; padding: 80px 0 110px; }
.article-back { color: var(--blue); font-size: .82rem; font-weight: 750; }
.article-header { margin: 2rem 0 3.5rem; }
.article-header h1 { margin: 0 0 1.2rem; font-family: var(--serif); font-size: clamp(2.8rem, 7vw, 5.2rem); line-height: 1.03; letter-spacing: -.055em; font-weight: 600; }
.article-meta { color: var(--ink-soft); font-size: .84rem; }
.prose { font-family: var(--serif); font-size: 1.17rem; line-height: 1.9; }
.prose h2 { margin-top: 2.4rem; font-size: 1.8rem; line-height: 1.3; }
.prose blockquote { margin: 2.5rem 0; padding: .8rem 0 .8rem 1.5rem; border-left: 3px solid var(--red); color: var(--blue-deep); font-size: 1.45rem; line-height: 1.55; }
.prose code { font-family: ui-monospace, monospace; font-size: .88em; background: #e7ebf4; padding: .15em .35em; }

.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 3rem; }
.principle { min-height: 260px; background: var(--paper); padding: 1.7rem; }
.principle span { color: var(--red); font-size: .72rem; font-weight: 850; }
.principle h3 { margin: 4rem 0 .8rem; font-family: var(--serif); font-size: 1.7rem; }
.principle p { margin: 0; color: var(--ink-soft); font-size: .9rem; }

.site-footer { padding: 58px 0 28px; background: var(--ink); color: white; }
.footer-top { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: end; padding-bottom: 50px; }
.footer-title { max-width: 760px; margin: 0; font-family: var(--serif); font-size: clamp(2.4rem, 6vw, 5.8rem); line-height: .98; letter-spacing: -.055em; font-weight: 600; }
.footer-note { max-width: 260px; color: #b8c3d6; }
.footer-bottom { display: flex; justify-content: space-between; gap: 2rem; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.2); color: #9eabc0; font-size: .78rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-links a:hover { color: white; }

.reveal { animation: rise .7s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; animation: none !important; transition: none !important; } }

@media (max-width: 880px) {
  .hero-grid, .page-hero-grid, .about-grid, .profile-grid { grid-template-columns: 1fr; gap: 38px; }
  .hero { padding-top: 50px; }
  .hero-art { max-width: 620px; }
  .portrait-wrap { max-width: 560px; }
  .profile-photo { position: static; max-width: 560px; }
  .signal-grid, .principles { grid-template-columns: 1fr; }
  .signal { border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .signal:last-child { border-bottom: 0; }
  .learning-item { grid-template-columns: 100px 1fr; }
  .learning-item .tag-row { grid-column: 2; justify-content: flex-start; }
  .project-grid { grid-template-columns: 1fr; }
  .roadmap { grid-template-columns: 1fr 1fr; }
  .roadmap-item:nth-child(2) { border-right: 0; }
  .roadmap-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 640px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .nav-wrap { height: 64px; }
  .menu-button { display: block; }
  .nav-links { position: absolute; inset: 64px 0 auto; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: .7rem 14px 1rem; background: var(--paper); border-bottom: 1px solid var(--line); }
  .nav-links[data-open="true"] { display: flex; }
  .nav-link { padding: .8rem 0; border-bottom: 1px solid var(--line); }
  .hero h1 span:last-child { margin-left: 0; }
  .hero-copy { font-size: 1rem; }
  .hero-art { box-shadow: 10px 12px 0 rgba(123,49,69,.13); }
  .section { padding: 68px 0; }
  .section-head { align-items: start; flex-direction: column; }
  .learning-item { grid-template-columns: 1fr; gap: .5rem; }
  .learning-item .tag-row { grid-column: 1; }
  .roadmap { grid-template-columns: 1fr; }
  .roadmap-item { border-right: 0; border-bottom: 1px solid var(--line); }
  .roadmap-item:last-child { border-bottom: 0; }
  .footer-top { grid-template-columns: 1fr; align-items: start; }
  .footer-bottom { flex-direction: column; }
}