/* =============================================================
   KERUO YANG — base + design tokens
   Near-black editorial system. Photography is the only colour.
   ============================================================= */

:root {
  /* type scale */
  --text-xs: clamp(0.6875rem, 0.66rem + 0.14vw, 0.75rem);
  --text-sm: clamp(0.8125rem, 0.78rem + 0.16vw, 0.875rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.2vw, 2.125rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.6vw, 3.25rem);
  --text-3xl: clamp(2.75rem, 1rem + 5.4vw, 6rem);
  --text-hero: clamp(3rem, 0.4rem + 8.4vw, 9rem);

  /* spacing */
  --space-1: 0.25rem; --space-2: 0.5rem;  --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem;  --space-8: 2rem;    --space-10: 2.5rem;
  --space-12: 3rem;   --space-16: 4rem;   --space-20: 5rem;   --space-24: 6rem;
  --space-32: 8rem;   --space-40: 10rem;

  /* colour — monochrome only */
  --color-bg: #0e0e0e;
  --color-bg-deep: #080808;
  --color-surface: #141413;
  --color-text: #efe9e1;
  --color-text-muted: #948d84;
  --color-text-faint: #5e5a55;
  --color-line: rgba(239, 233, 225, 0.13);
  --color-line-strong: rgba(239, 233, 225, 0.28);

  --font-display: 'Fraunces', 'Noto Serif SC', Georgia, serif;
  --font-display-zh: 'Noto Serif SC', 'Fraunces', Georgia, serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'Helvetica Neue', sans-serif;

  --page-x: clamp(1.25rem, 5vw, 5rem);
  --content-narrow: 62ch;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 220ms var(--ease);
  --t-slow: 1200ms var(--ease);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  background: var(--color-bg);
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}
body[lang="zh-Hans"] { letter-spacing: 0.01em; }

img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-weight: 400; line-height: 1.08; text-wrap: balance; }
p { text-wrap: pretty; }
::selection { background: rgba(239, 233, 225, 0.2); }
:focus-visible { outline: 1px solid var(--color-line-strong); outline-offset: 4px; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- shared type helpers ---------- */
.display { font-family: var(--font-display); font-weight: 300; letter-spacing: -0.02em; }
[lang="zh-Hans"] .display,
.display--zh { font-family: var(--font-display-zh); font-weight: 300; letter-spacing: 0.01em; }

.kicker {
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
[lang="zh-Hans"] .kicker { letter-spacing: 0.18em; }

.lede {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-text-muted);
  max-width: 46ch;
  font-weight: 300;
}

.prose p { max-width: var(--content-narrow); color: #cfc8c0; margin-bottom: var(--space-5); }
.prose p:last-child { margin-bottom: 0; }

/* ---------- header ---------- */
.header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-6);
  padding: var(--space-5) var(--page-x);
  transition: background 400ms var(--ease), backdrop-filter 400ms var(--ease),
              border-color 400ms var(--ease), padding 400ms var(--ease);
  border-bottom: 1px solid transparent;
}
.header--scrolled {
  background: rgba(10, 10, 10, 0.82);
  backdrop-filter: blur(14px) saturate(120%);
  border-bottom-color: var(--color-line);
  padding-block: var(--space-3);
}

.brand { display: flex; align-items: center; gap: var(--space-3); }
.brand svg { width: 26px; height: 26px; color: var(--color-text); }
.brand__name {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav { display: flex; align-items: center; gap: clamp(1rem, 2vw, 2rem); }
.nav__link {
  position: relative;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-block: 2px;
  transition: color var(--t-fast);
  white-space: nowrap;
}
.nav__link::after {
  content: ''; position: absolute; left: 0; bottom: -2px;
  width: 100%; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: right;
  transition: transform 520ms var(--ease);
}
.nav__link:hover { color: var(--color-text); }
.nav__link:hover::after { transform: scaleX(1); transform-origin: left; }
.nav__link[aria-current='page'] { color: var(--color-text); }
.nav__link[aria-current='page']::after { transform: scaleX(1); background: var(--color-line-strong); }

.nav__sep { width: 1px; height: 14px; background: var(--color-line); }

.lang {
  display: flex; align-items: center; gap: 0.4rem;
  font-size: var(--text-xs); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-text-faint);
}
.lang a { transition: color var(--t-fast); }
.lang a:hover { color: var(--color-text); }
.lang .is-active { color: var(--color-text); }

.burger { display: none; width: 28px; height: 28px; background: none; border: 0; cursor: pointer; color: var(--color-text); }
.burger span { display: block; height: 1px; background: currentColor; margin: 7px 0; transition: transform 300ms var(--ease), opacity 200ms; }
.is-open .burger span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.is-open .burger span:nth-child(2) { opacity: 0; }
.is-open .burger span:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

@media (max-width: 900px) {
  .burger { display: block; position: relative; z-index: 95; }
  /* the open overlay must not sit inside a backdrop-filtered ancestor,
     or `position: fixed` would resolve against the header box */
  body.is-open .header { background: transparent; backdrop-filter: none; border-bottom-color: transparent; }
  .nav {
    position: fixed; inset: 0; z-index: 90;
    flex-direction: column; align-items: flex-start; justify-content: center;
    gap: var(--space-5);
    padding: var(--space-24) var(--page-x) var(--space-16);
    overflow-y: auto;
    background: var(--color-bg-deep);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: opacity 320ms var(--ease), transform 320ms var(--ease), visibility 320ms;
  }
  body.is-open .nav { opacity: 1; visibility: visible; transform: none; }
  .nav__link { font-size: var(--text-xl); font-family: var(--font-display); color: var(--color-text); }
  .nav__sep { display: none; }
  .nav .lang { font-size: var(--text-sm); margin-top: var(--space-4); }
  body.is-open { overflow: hidden; }
}

/* ---------- hero ---------- */
.hero { position: relative; height: 100svh; min-height: 560px; width: 100%; overflow: hidden; }
.hero__img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: center 42%;
  filter: saturate(0.92) contrast(1.03);
  transform: scale(1.04);
  animation: heroDrift 18s var(--ease) forwards;
}
@keyframes heroDrift { to { transform: scale(1); } }
.hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(180deg, rgba(8,8,8,0.62) 0%, rgba(8,8,8,0.12) 32%, rgba(8,8,8,0.22) 60%, rgba(8,8,8,0.9) 100%);
}
.hero__inner {
  position: absolute; inset: auto 0 0 0; z-index: 2;
  padding: 0 var(--page-x) clamp(3rem, 8vh, 6rem);
  display: flex; flex-direction: column; gap: var(--space-5);
}
.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 300;
  line-height: 0.92;
  letter-spacing: -0.035em;
}
[lang="zh-Hans"] .hero__title { font-family: var(--font-display-zh); letter-spacing: 0.02em; line-height: 1.02; }
.hero__meta {
  display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-8);
  align-items: baseline; justify-content: space-between;
  border-top: 1px solid var(--color-line); padding-top: var(--space-4);
}
.hero__sub { font-size: var(--text-sm); color: var(--color-text-muted); max-width: 44ch; }
.scroll-hint {
  font-size: var(--text-xs); letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--color-text-faint); display: flex; align-items: center; gap: var(--space-3);
}
.scroll-hint::after {
  content: ''; width: 42px; height: 1px; background: currentColor;
  transform-origin: left; animation: pulseLine 3.2s var(--ease) infinite;
}
@keyframes pulseLine { 0%,100% { transform: scaleX(0.3); opacity: 0.5 } 50% { transform: scaleX(1); opacity: 1 } }

/* ---------- sections ---------- */
.section { padding: clamp(4rem, 11vw, 10rem) var(--page-x); }
.section--tight { padding-block: clamp(3rem, 7vw, 6rem); }
.section__head {
  display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-10);
  align-items: baseline; justify-content: space-between;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: var(--space-4); margin-bottom: clamp(2rem, 5vw, 4rem);
}
.section__title { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 300; }
[lang="zh-Hans"] .section__title { font-family: var(--font-display-zh); }

/* page header (interior pages) */
.pagehead { padding: clamp(8rem, 16vh, 12rem) var(--page-x) clamp(2.5rem, 6vw, 5rem); }
.pagehead__title {
  font-family: var(--font-display); font-weight: 300;
  font-size: var(--text-3xl); letter-spacing: -0.03em; margin-top: var(--space-4);
}
[lang="zh-Hans"] .pagehead__title { font-family: var(--font-display-zh); letter-spacing: 0.02em; }
.pagehead__intro { margin-top: var(--space-8); max-width: 58ch; color: var(--color-text-muted); font-size: var(--text-base); }
.pagehead--split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-10); align-items: end; }
@media (max-width: 800px) { .pagehead--split { grid-template-columns: 1fr; } }

/* ---------- figure / image behaviour ---------- */
.fig { position: relative; margin: 0; }
.fig__frame {
  position: relative; overflow: hidden; background: #151513;
  background-size: cover; background-position: center;
}
.fig__frame img {
  width: 100%; height: 100%; object-fit: cover;
  opacity: 0; transform: scale(1.015);
  transition: opacity 900ms var(--ease), transform var(--t-slow);
}
.fig__frame img.is-loaded { opacity: 1; transform: scale(1); }
a.fig__frame:hover img, .fig__frame:hover img.is-loaded { transform: scale(1.03); }
.fig__cap {
  display: flex; gap: var(--space-4); justify-content: space-between; align-items: baseline;
  margin-top: var(--space-3); font-size: var(--text-xs); color: var(--color-text-faint);
  letter-spacing: 0.04em;
}
.fig__cap b { font-weight: 400; color: var(--color-text-muted); }
.fig__frame::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.05);
}

/* ---------- editorial gallery grid ---------- */
.grid {
  display: grid; grid-template-columns: repeat(12, 1fr);
  column-gap: clamp(1rem, 2.4vw, 2.5rem);
  row-gap: clamp(3rem, 9vw, 8rem);
  align-items: end;
}
.grid .fig { grid-column: 1 / -1; }
@media (min-width: 860px) {
  .grid .g0 { grid-column: 1 / 9; }
  .grid .g1 { grid-column: 9 / 13; margin-bottom: clamp(2rem, 6vw, 6rem); }
  .grid .g2 { grid-column: 2 / 7; }
  .grid .g3 { grid-column: 7 / 13; margin-top: clamp(2rem, 5vw, 5rem); }
  .grid .g4 { grid-column: 3 / 11; }
  .grid .g5 { grid-column: 1 / 5; }
  .grid .g6 { grid-column: 6 / 13; }
  .grid .g7 { grid-column: 2 / 10; }
}

/* ---------- home: featured stream ---------- */
.stream { display: flex; flex-direction: column; gap: clamp(4rem, 11vw, 10rem); }
.stream__item { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--space-6); align-items: end; }
.stream__item .fig { grid-column: 1 / 10; }
.stream__item .stream__text { grid-column: 10 / 13; padding-bottom: var(--space-2); }
.stream__item:nth-child(even) .fig { grid-column: 4 / 13; order: 2; }
.stream__item:nth-child(even) .stream__text { grid-column: 1 / 4; order: 1; }
.stream__text h3 { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 300; margin-bottom: var(--space-2); }
[lang="zh-Hans"] .stream__text h3 { font-family: var(--font-display-zh); }
.stream__text p { font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.06em; }
@media (max-width: 860px) {
  .stream__item, .stream__item:nth-child(even) { grid-template-columns: 1fr; }
  .stream__item .fig, .stream__item:nth-child(even) .fig { grid-column: 1; order: 1; }
  .stream__item .stream__text, .stream__item:nth-child(even) .stream__text { grid-column: 1; order: 2; }
}

/* ---------- category entries ---------- */
.cats { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1rem, 2.4vw, 2.5rem); }
@media (max-width: 800px) { .cats { grid-template-columns: 1fr; gap: var(--space-10); } }
.cat { display: block; }
.cat .fig__frame { aspect-ratio: 4 / 5; }
.cat__row {
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-4);
  margin-top: var(--space-4); padding-top: var(--space-3); border-top: 1px solid var(--color-line);
  transition: border-color 500ms var(--ease);
}
.cat:hover .cat__row { border-color: var(--color-line-strong); }
.cat__name { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 300; }
[lang="zh-Hans"] .cat__name { font-family: var(--font-display-zh); }
.cat__n { font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.16em; }

/* ---------- statement ---------- */
.statement { border-top: 1px solid var(--color-line); }
.statement blockquote {
  font-family: var(--font-display); font-weight: 300;
  font-size: var(--text-2xl); line-height: 1.28; letter-spacing: -0.02em;
  max-width: 22ch;
}
[lang="zh-Hans"] .statement blockquote { font-family: var(--font-display-zh); letter-spacing: 0.02em; max-width: 16em; line-height: 1.4; }
.statement footer { margin-top: var(--space-6); font-size: var(--text-xs); letter-spacing: 0.2em; text-transform: uppercase; color: var(--color-text-faint); }

/* ---------- about ---------- */
.about-grid { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; } }
.facts { border-top: 1px solid var(--color-line); margin-top: var(--space-10); }
.facts dl { display: grid; grid-template-columns: minmax(6rem, 10rem) 1fr; }
.facts dt, .facts dd {
  padding: var(--space-4) 0; border-bottom: 1px solid var(--color-line);
  font-size: var(--text-sm);
}
.facts dt { color: var(--color-text-faint); letter-spacing: 0.1em; text-transform: uppercase; font-size: var(--text-xs); padding-top: calc(var(--space-4) + 2px); }
.facts dd { color: var(--color-text-muted); }

.rule { border: 0; border-top: 1px solid var(--color-line); margin: clamp(3rem, 8vw, 7rem) 0; }

/* ---------- commissions ---------- */
.services { display: grid; gap: 0; border-top: 1px solid var(--color-line); }
.service {
  display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 6fr) minmax(0, 3fr);
  gap: var(--space-6);
  padding: clamp(2rem, 4vw, 3.5rem) 0;
  border-bottom: 1px solid var(--color-line);
  transition: background 600ms var(--ease);
}
.service:hover { background: rgba(255,255,255,0.015); }
.service__n { font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.2em; }
.service h3 { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 300; margin-bottom: var(--space-4); }
[lang="zh-Hans"] .service h3 { font-family: var(--font-display-zh); }
.service p { color: var(--color-text-muted); font-size: var(--text-sm); max-width: 52ch; }
.service ul { list-style: none; font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.05em; }
.service li { padding: var(--space-1) 0; }
@media (max-width: 860px) { .service { grid-template-columns: 1fr; gap: var(--space-4); } }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: 6fr 5fr; gap: clamp(2rem, 7vw, 7rem); align-items: start; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.mailto {
  display: inline-block; font-family: var(--font-display); font-weight: 300;
  font-size: var(--text-xl); letter-spacing: -0.01em;
  border-bottom: 1px solid var(--color-line-strong); padding-bottom: 4px;
  transition: border-color var(--t-fast), color var(--t-fast);
  word-break: break-all;
}
.mailto:hover { border-color: var(--color-text); }
.form { display: grid; gap: var(--space-5); margin-top: var(--space-8); }
.field { display: grid; gap: var(--space-2); }
.field label { font-size: var(--text-xs); letter-spacing: 0.16em; text-transform: uppercase; color: var(--color-text-faint); }
.field input, .field textarea, .field select {
  background: transparent; border: 0; border-bottom: 1px solid var(--color-line);
  color: var(--color-text); font: inherit; font-size: var(--text-sm);
  padding: var(--space-3) 0; border-radius: 0;
  transition: border-color var(--t-fast);
}
.field select option { background: #141413; color: var(--color-text); }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-bottom-color: var(--color-text); }
.field textarea { resize: vertical; min-height: 110px; }
.btn {
  justify-self: start; margin-top: var(--space-2);
  background: transparent; border: 1px solid var(--color-line-strong); color: var(--color-text);
  font-size: var(--text-xs); letter-spacing: 0.2em; text-transform: uppercase;
  padding: var(--space-4) var(--space-8); cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}
.btn:hover { background: var(--color-text); color: #0b0b0b; border-color: var(--color-text); }
.form__note { font-size: var(--text-xs); color: var(--color-text-faint); }
.channels { list-style: none; border-top: 1px solid var(--color-line); }
.channels li { display: flex; justify-content: space-between; gap: var(--space-4); padding: var(--space-4) 0; border-bottom: 1px solid var(--color-line); font-size: var(--text-sm); }
.channels span:first-child { color: var(--color-text-faint); font-size: var(--text-xs); letter-spacing: 0.16em; text-transform: uppercase; }
.channels a { color: var(--color-text-muted); transition: color var(--t-fast); }
.channels a:hover { color: var(--color-text); }

/* ---------- next-page link ---------- */
.next {
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-6);
  padding: clamp(3rem, 8vw, 6rem) var(--page-x);
  border-top: 1px solid var(--color-line);
}
.next__label { font-size: var(--text-xs); letter-spacing: 0.2em; text-transform: uppercase; color: var(--color-text-faint); }
.next__title { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 300; transition: opacity var(--t-fast); }
[lang="zh-Hans"] .next__title { font-family: var(--font-display-zh); }
.next:hover .next__title { opacity: 0.6; }

/* ---------- footer ---------- */
.footer {
  display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-8);
  align-items: center; justify-content: space-between;
  padding: var(--space-8) var(--page-x) var(--space-10);
  border-top: 1px solid var(--color-line);
  font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.08em;
}
.footer a { transition: color var(--t-fast); }
.footer a:hover { color: var(--color-text); }
.footer__links { display: flex; gap: var(--space-5); flex-wrap: wrap; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(22px); }
.reveal.is-in { opacity: 1; transform: none; transition: opacity 1100ms var(--ease), transform 1100ms var(--ease); }
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal.is-in { opacity: 1; transform: none; transition: none; }
  .hero__img { animation: none; transform: none; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- lightbox ---------- */
.lb {
  position: fixed; inset: 0; z-index: 200; display: none;
  background: rgba(6, 6, 6, 0.985);
  backdrop-filter: blur(18px) saturate(0.6);
  opacity: 0; transition: opacity 320ms var(--ease);
}
.lb.is-open { display: block; }
.lb.is-visible { opacity: 1; }
.lb__stage { position: absolute; inset: clamp(3.5rem, 9vh, 6rem) clamp(1rem, 7vw, 7rem); display: flex; align-items: center; justify-content: center; }
.lb__stage img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; }
.lb__bar {
  position: absolute; inset: auto 0 0 0;
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-4);
  padding: var(--space-5) clamp(1rem, 7vw, 7rem);
  font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.08em;
  pointer-events: none;
}
.lb__bar b { font-weight: 400; color: var(--color-text-muted); }
.lb__close {
  position: absolute; top: clamp(0.75rem, 2vh, 1.5rem); right: clamp(1rem, 4vw, 3rem);
  width: 44px; height: 44px; color: var(--color-text-muted); background: none; border: 0; cursor: pointer;
  transition: color var(--t-fast);
}
.lb__close:hover { color: var(--color-text); }
.lb__nav {
  position: absolute; z-index: 2; top: 50%; transform: translateY(-50%);
  width: 56px; height: 56px; background: none; border: 0; cursor: pointer;
  color: var(--color-text-faint); transition: color var(--t-fast);
}
.lb__nav:hover { color: var(--color-text); }
.lb__nav--prev { left: clamp(0.25rem, 2vw, 2rem); }
.lb__nav--next { right: clamp(0.25rem, 2vw, 2rem); }
@media (max-width: 700px) {
  .lb__stage { inset: 3.5rem 0.75rem 6.5rem; }
  .lb__nav { top: auto; bottom: 0.6rem; transform: none; width: 44px; height: 44px; }
  .lb__nav--prev { left: 0.5rem; } .lb__nav--next { left: 3.6rem; right: auto; }
  .lb__bar { padding: 0 0.9rem 1.4rem; justify-content: flex-end; align-items: flex-end; flex-direction: column; gap: 0.25rem; }
  .lb__bar .lb__meta { text-align: right; }
}

/* ---------- long-term project: video placeholder ---------- */
.facts--flush { margin-top: 0; }
.videobox { position: relative; margin: 0; max-width: 900px; }
.videobox__el {
  width: 100%; aspect-ratio: 16 / 9; height: auto;
  background: #101010 center / cover no-repeat;
  object-fit: cover;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06);
  filter: saturate(0.9) brightness(0.72);
}
.videobox__badge {
  position: absolute; top: var(--space-4); left: var(--space-4);
  font-size: var(--text-xs); letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-text-muted);
  background: rgba(8,8,8,0.72); border: 1px solid var(--color-line);
  padding: var(--space-2) var(--space-4);
  backdrop-filter: blur(6px);
}
.videobox .fig__cap { margin-top: var(--space-4); }

/* ---------- about: placeholder marker ---------- */
.todo {
  margin-top: var(--space-4);
  font-family: var(--font-display); font-size: var(--text-xl); font-weight: 300;
  color: var(--color-text-faint);
}
[lang="zh-Hans"] .todo { font-family: var(--font-display-zh); }

/* ---------- proposal letter (zh only, not in nav) ---------- */
.letter { max-width: 78rem; margin: 0 auto; padding: 0 var(--page-x); }
.letter__top {
  padding: clamp(8rem, 18vh, 13rem) 0 clamp(3rem, 7vw, 5rem);
  border-bottom: 1px solid var(--color-line);
}
.letter__title {
  font-family: var(--font-display-zh); font-weight: 300;
  font-size: clamp(2rem, 1rem + 3.6vw, 4rem); line-height: 1.22; letter-spacing: 0.01em;
  margin-top: var(--space-6); max-width: 20em;
}
.letter__lede {
  margin-top: var(--space-8); color: var(--color-text-muted);
  font-size: var(--text-sm); max-width: 44ch;
}
.letter__sec {
  display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(1.5rem, 5vw, 5rem);
  padding: clamp(3rem, 8vw, 6.5rem) 0;
  border-bottom: 1px solid var(--color-line);
  align-items: start;
}
.letter__sec--end { border-bottom: 0; }
.letter__head { position: sticky; top: clamp(5rem, 12vh, 7rem); }
.letter__n {
  display: block; font-size: var(--text-xs); letter-spacing: 0.22em;
  color: var(--color-text-faint);
}
.letter__t {
  font-family: var(--font-display-zh); font-weight: 300;
  font-size: var(--text-xl); margin-top: var(--space-3);
}
.letter .prose p { color: #cfc8c0; max-width: 46ch; }

.steps { display: grid; gap: clamp(2rem, 4vw, 3rem); }
.step { display: grid; grid-template-columns: minmax(0, 5rem) minmax(0, 1fr); gap: var(--space-5); }
.step__n {
  font-size: var(--text-xs); letter-spacing: 0.16em; color: var(--color-text-faint);
  padding-top: 0.55rem; white-space: nowrap;
}
.step h3 {
  font-family: var(--font-display-zh); font-size: var(--text-lg); font-weight: 300;
  margin-bottom: var(--space-4);
}
.step ul { list-style: none; display: grid; gap: var(--space-3); }
.step li {
  position: relative; padding-left: var(--space-5);
  font-size: var(--text-sm); color: var(--color-text-muted); max-width: 48ch;
}
.step li::before {
  content: ''; position: absolute; left: 0; top: 0.72em;
  width: 10px; height: 1px; background: var(--color-line-strong);
}

.letter__links { list-style: none; border-top: 1px solid var(--color-line); }
.letter__links a {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between;
  gap: var(--space-4); padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-line);
  transition: border-color var(--t-fast);
}
.letter__links a:hover { border-bottom-color: var(--color-line-strong); }
.letter__links span {
  font-family: var(--font-display-zh); font-size: var(--text-lg); font-weight: 300;
}
.letter__links em {
  font-style: normal; font-size: var(--text-xs); letter-spacing: 0.1em;
  color: var(--color-text-faint); transition: color var(--t-fast);
}
.letter__links a:hover em { color: var(--color-text-muted); }

.letter__sign { max-width: 40ch; color: #cfc8c0; margin-bottom: var(--space-8); }
.letter__foot {
  margin-top: var(--space-8); font-size: var(--text-xs);
  letter-spacing: 0.14em; color: var(--color-text-faint);
}

@media (max-width: 860px) {
  .letter__sec { grid-template-columns: 1fr; gap: var(--space-6); }
  .letter__head { position: static; }
  .step { grid-template-columns: 1fr; gap: var(--space-3); }
  .step__n { padding-top: 0; }
}