:root {
  --paper-ground: #ded4c3;
  --paper: #f2ebdd;
  --paper-light: #fbf8f0;
  --ink: #29251f;
  --ink-soft: #6d6458;
  --line: #d5c8b4;
  --line-strong: #a99a84;
  --accent: #9a6a32;
  --accent-dark: #6f4821;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, SimSun, serif;
  --sans: "Avenir Next", Avenir, "PingFang SC", "Microsoft YaHei", sans-serif;
  --content-max: 1160px;
  --page-gutter: clamp(1.35rem, 4vw, 4.5rem);
  --section-space: clamp(5.5rem, 11vw, 10rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 12%, rgba(255, 255, 255, 0.42), transparent 30rem),
    linear-gradient(135deg, rgba(70, 55, 34, 0.025) 25%, transparent 25%) 0 0 / 5px 5px,
    var(--paper-ground);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

::selection {
  color: var(--paper-light);
  background: var(--accent-dark);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  color: var(--paper-light);
  background: var(--ink);
  font-family: var(--sans);
  font-size: 0.85rem;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell {
  display: grid;
  grid-template-columns: 4rem minmax(0, var(--content-max));
  width: min(calc(100% - 2.5rem), calc(var(--content-max) + 4rem));
  min-height: calc(100vh - 3rem);
  margin: 1.5rem auto;
  border: 1px solid rgba(92, 75, 52, 0.25);
  box-shadow: 0 1.6rem 5rem rgba(57, 44, 27, 0.13);
}

.margin-rail {
  position: relative;
  color: var(--paper-light);
  background: var(--ink);
  overflow: hidden;
}

.margin-rail::after {
  content: "";
  position: absolute;
  inset: 0.65rem;
  border: 1px solid rgba(242, 235, 221, 0.2);
  pointer-events: none;
}

.margin-rail__inner {
  position: sticky;
  top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: calc(100vh - 3rem);
  padding: 2rem 0;
  font-family: var(--sans);
  font-size: 0.63rem;
  letter-spacing: 0.22em;
  writing-mode: vertical-rl;
}

.paper {
  position: relative;
  min-width: 0;
  background:
    radial-gradient(circle at 92% 4%, rgba(255, 255, 255, 0.58), transparent 23rem),
    linear-gradient(rgba(92, 73, 47, 0.022) 1px, transparent 1px) 0 0 / 100% 6px,
    var(--paper);
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 5rem;
  padding: 0 var(--page-gutter);
  border-bottom: 1px solid var(--line);
  background: rgba(242, 235, 221, 0.92);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.65rem;
  text-decoration: none;
}

.brand__cn {
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand__en {
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.67rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.5rem);
  font-family: var(--sans);
  font-size: 0.82rem;
}

.site-nav a {
  position: relative;
  padding: 0.35rem 0;
  color: var(--ink-soft);
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

main:focus {
  outline: none;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(9rem, 0.55fr);
  gap: clamp(2rem, 7vw, 6.5rem);
  align-items: center;
  min-height: min(47rem, calc(100vh - 8rem));
  padding: clamp(5rem, 10vw, 9rem) var(--page-gutter);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 14%;
  right: -5rem;
  width: 20rem;
  height: 20rem;
  border: 1px solid rgba(154, 106, 50, 0.2);
  border-radius: 50%;
  box-shadow:
    0 0 0 2.5rem rgba(154, 106, 50, 0.025),
    0 0 0 5rem rgba(154, 106, 50, 0.018);
  pointer-events: none;
}

.hero__copy {
  position: relative;
  z-index: 1;
  max-width: 48rem;
}

.eyebrow,
.section-kicker,
.section-number,
.tool-placeholder__topline,
.maker-note__label {
  margin: 0;
  font-family: var(--sans);
  text-transform: uppercase;
}

.eyebrow {
  color: var(--accent-dark);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  animation: reveal 700ms both 100ms;
}

h1,
h2,
p {
  text-wrap: pretty;
}

h1 {
  max-width: 12em;
  margin: 1.2rem 0 1.65rem;
  font-size: clamp(2.65rem, 6.4vw, 5.75rem);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.045em;
  animation: reveal 760ms both 180ms;
}

.hero__intro {
  max-width: 34rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.55vw, 1.15rem);
  line-height: 1.95;
  animation: reveal 760ms both 260ms;
}

.text-action {
  display: inline-flex;
  align-items: center;
  gap: 2.5rem;
  min-width: 11rem;
  margin-top: 2.5rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-family: var(--sans);
  font-size: 0.85rem;
  text-decoration: none;
  animation: reveal 760ms both 340ms;
  transition: color 180ms ease, padding 180ms ease;
}

.text-action:hover,
.text-action:focus-visible {
  padding-right: 0.7rem;
  padding-left: 0.7rem;
  color: var(--paper-light);
  background: var(--ink);
}

.hero__folio {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 23rem;
  flex-direction: column;
  align-items: flex-end;
  justify-content: space-between;
  padding: 1.2rem 0 0 clamp(1.5rem, 3vw, 2.75rem);
  border-left: 1px solid var(--line-strong);
  animation: reveal 800ms both 320ms;
}

.hero__folio-number {
  color: rgba(41, 37, 31, 0.16);
  font-family: var(--serif);
  font-size: clamp(5rem, 12vw, 9rem);
  font-weight: 600;
  line-height: 0.8;
}

.hero__folio-line {
  width: 1px;
  flex: 1;
  margin: 2rem 2.3rem;
  background: linear-gradient(var(--accent), transparent);
}

.hero__folio-label {
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  writing-mode: vertical-rl;
}

.editorial-section {
  display: grid;
  grid-template-columns: minmax(8rem, 0.38fr) minmax(0, 1.62fr);
  gap: clamp(2rem, 6vw, 6rem);
  padding: var(--section-space) var(--page-gutter);
  border-top: 1px solid var(--line);
  scroll-margin-top: 5rem;
}

.section-heading {
  padding-top: 0.5rem;
}

.section-number {
  color: var(--accent);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
}

.section-kicker {
  margin-top: 1.25rem;
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.section-content {
  max-width: 47rem;
}

.section-content h2 {
  margin: 0 0 2rem;
  font-size: clamp(2rem, 4.6vw, 4rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.035em;
}

.section-content > p,
.section-content--about > div > p {
  max-width: 39rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.45vw, 1.12rem);
  line-height: 2;
}

.section-content--story {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(8rem, 0.34fr);
  gap: 2.5rem;
}

.section-content--story h2,
.section-content--story > p:not(.margin-note) {
  grid-column: 1;
}

.margin-note {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: end;
  margin: 0;
  padding: 1rem 0 0 1.2rem;
  border-top: 2px solid var(--accent);
  color: var(--ink-soft);
  font-size: 0.78rem;
  line-height: 1.8;
}

.margin-note span {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--accent-dark);
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
}

.tools {
  background: rgba(251, 248, 240, 0.52);
}

.tool-placeholder {
  margin-top: clamp(3rem, 7vw, 5.5rem);
  border: 1px solid var(--line-strong);
  background: rgba(251, 248, 240, 0.58);
}

.tool-placeholder__topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.63rem;
  letter-spacing: 0.13em;
}

.tool-placeholder__body {
  display: grid;
  grid-template-columns: auto minmax(8rem, 0.45fr) minmax(12rem, 1fr);
  gap: 1.25rem;
  align-items: center;
  min-height: 8.5rem;
  padding: 1.5rem;
}

.status-mark {
  width: 0.65rem;
  height: 0.65rem;
  border: 1px solid var(--accent-dark);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0.35rem rgba(154, 106, 50, 0.1);
}

.tool-placeholder__body strong {
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  font-weight: 600;
}

.tool-placeholder__body > span:last-child {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.section-content--about {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(10rem, 0.4fr);
  gap: clamp(2rem, 6vw, 5rem);
}

.maker-note {
  align-self: end;
  padding: 1.4rem;
  border-top: 3px solid var(--ink);
  border-bottom: 1px solid var(--line-strong);
  background: rgba(251, 248, 240, 0.5);
}

.maker-note__label {
  color: var(--accent-dark);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
}

.maker-note > p:not(.maker-note__label) {
  margin: 1.3rem 0 2.25rem;
  font-size: 1rem;
  line-height: 1.8;
}

.maker-note span {
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.7rem;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 2rem;
  align-items: end;
  padding: 2.2rem var(--page-gutter);
  border-top: 1px solid var(--ink);
  font-family: var(--sans);
  font-size: 0.72rem;
}

.site-footer div {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.site-footer div span,
.site-footer p {
  margin: 0;
  color: var(--ink-soft);
}

.not-found {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 3rem;
  align-items: center;
  min-height: calc(100vh - 8rem);
  padding: clamp(4rem, 10vw, 9rem) var(--page-gutter);
}

.not-found h1 {
  margin-top: 1.25rem;
}

.not-found__number {
  margin: 0;
  color: rgba(41, 37, 31, 0.1);
  font-size: clamp(7rem, 20vw, 14rem);
  font-weight: 600;
  line-height: 0.8;
  writing-mode: vertical-rl;
}

:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 4px;
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  .site-shell {
    grid-template-columns: 1fr;
    width: min(calc(100% - 1rem), var(--content-max));
    margin: 0.5rem auto;
  }

  .margin-rail {
    min-height: 2.4rem;
  }

  .margin-rail::after {
    inset: 0.35rem;
  }

  .margin-rail__inner {
    position: static;
    height: auto;
    flex-direction: row;
    padding: 0.65rem 1rem;
    writing-mode: horizontal-tb;
  }

  .site-header {
    min-height: 4.4rem;
  }

  .brand__en {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 5rem;
    padding-bottom: 5.5rem;
  }

  .hero::before {
    top: auto;
    right: -9rem;
    bottom: 1rem;
  }

  .hero__folio {
    min-height: auto;
    flex-direction: row;
    align-items: center;
    padding: 1.2rem 0 0;
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }

  .hero__folio-number {
    font-size: 4rem;
  }

  .hero__folio-line {
    width: auto;
    height: 1px;
    margin: 0 1.2rem;
    background: linear-gradient(90deg, var(--accent), transparent);
  }

  .hero__folio-label {
    writing-mode: horizontal-tb;
  }

  .editorial-section {
    grid-template-columns: 1fr;
    gap: 2.3rem;
  }

  .section-heading {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    padding-top: 0;
  }

  .section-kicker {
    margin-top: 0;
  }

  .section-content--story,
  .section-content--about {
    grid-template-columns: 1fr;
  }

  .section-content--story h2,
  .section-content--story > p:not(.margin-note),
  .margin-note {
    grid-column: 1;
  }

  .margin-note {
    grid-row: auto;
    max-width: 18rem;
  }

  .tool-placeholder__body {
    grid-template-columns: auto 1fr;
  }

  .tool-placeholder__body > span:last-child {
    grid-column: 2;
  }

  .maker-note {
    max-width: 22rem;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    align-items: start;
  }

  .not-found {
    grid-template-columns: 1fr;
  }

  .not-found__number {
    justify-self: end;
    font-size: 7rem;
    writing-mode: horizontal-tb;
  }
}

@media (max-width: 420px) {
  :root {
    --page-gutter: 1.15rem;
  }

  body {
    font-size: 15px;
  }

  .site-header {
    gap: 1rem;
  }

  .site-nav {
    gap: 1rem;
    font-size: 0.78rem;
  }

  h1 {
    font-size: clamp(2.25rem, 12.5vw, 3.15rem);
  }

  .hero__intro {
    line-height: 1.85;
  }

  .tool-placeholder__topline span:last-child {
    display: none;
  }

  .tool-placeholder__body {
    grid-template-columns: auto 1fr;
    padding: 1.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  body {
    background: #fff;
  }

  .site-shell {
    display: block;
    width: 100%;
    margin: 0;
    border: 0;
    box-shadow: none;
  }

  .margin-rail,
  .site-nav,
  .text-action,
  .hero::before {
    display: none;
  }

  .site-header {
    position: static;
    background: #fff;
  }

  .paper,
  .tools {
    background: #fff;
  }
}