/* =========================================================
   Feiya Yang — portfolio theme
   Editorial, restrained, content-led. One accent, hairlines, generous type.
   ========================================================= */

/* ---------- Fonts (latin subsets, self-hosted; CJK uses system fonts) ---------- */

@font-face {
  font-family: "Inter Variable";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/fonts/inter-latin-wght-normal.woff2") format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0394, U+2000-206F, U+20AC, U+2122, U+2190-2199, U+2212, U+2215, U+21C4;
}

@font-face {
  font-family: "JetBrains Mono Variable";
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url("/fonts/jetbrains-mono-latin-wght-normal.woff2") format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212, U+2215;
}

/* ---------- Tokens ---------- */

:root {
  color-scheme: light;
  --bg: #fbfbf9;
  --bg-raise: #ffffff;
  --tint: #f2f1ed;
  --ink: #121211;
  --ink-2: #55534d;
  --ink-3: #85827a;
  --line: #e5e3dc;
  --line-strong: #cbc8be;
  --accent: #cf4310;
  --accent-ink: #ffffff;
  --code-bg: #f4f3ef;
  --media-bg: #ecebe6;
  --diagram-bg: #161615;
  --diagram-ink: #e9e7e0;

  --sans: "Inter Variable", "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono Variable", ui-monospace, "SF Mono", "Cascadia Code", Consolas, "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", monospace;

  --gutter: clamp(20px, 4vw, 56px);
  --max: 1240px;
  --measure: 720px;
  --radius: 6px;
  --header-h: 64px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e0e0d;
  --bg-raise: #151514;
  --tint: #1a1a18;
  --ink: #ecebe6;
  --ink-2: #aba89f;
  --ink-3: #7a776f;
  --line: #262624;
  --line-strong: #3b3a36;
  --accent: #ff7a45;
  --accent-ink: #14110f;
  --code-bg: #171716;
  --media-bg: #1b1b19;
  --diagram-bg: #1b1b19;
  --diagram-ink: #e9e7e0;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0e0e0d;
    --bg-raise: #151514;
    --tint: #1a1a18;
    --ink: #ecebe6;
    --ink-2: #aba89f;
    --ink-3: #7a776f;
    --line: #262624;
    --line-strong: #3b3a36;
    --accent: #ff7a45;
    --accent-ink: #14110f;
    --code-bg: #171716;
    --media-bg: #1b1b19;
    --diagram-bg: #1b1b19;
    --diagram-ink: #e9e7e0;
  }
}

/* ---------- Base ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  font-feature-settings: "cv11", "ss03";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
dd,
figure,
blockquote,
pre {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
}

::selection {
  background: var(--ink);
  color: var(--bg);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 100;
  padding: 8px 14px;
  background: var(--ink);
  color: var(--bg);
  font-size: 14px;
  border-radius: 4px;
}

.skip-link:focus {
  top: 12px;
}

.wrap {
  width: min(100% - 2 * var(--gutter), var(--max));
  margin-inline: auto;
}

.wrap--wide {
  --max: 1440px;
}

/* Small uppercase mono label: the recurring "instrument panel" voice. */
.label {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.label a:hover {
  color: var(--ink);
}

.link-arrow {
  font-size: 15px;
  font-weight: 550;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.link-arrow:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 18px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  font-size: 14.5px;
  font-weight: 550;
  line-height: 1;
  white-space: nowrap;
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease);
}

.btn:hover {
  border-color: var(--ink);
}

.btn--solid {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}

.btn--solid:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease);
}

.site-header.is-stuck {
  border-bottom-color: var(--line);
}

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.brand__mark {
  width: auto;
  height: 22px;
}

.brand__mark--dark {
  display: none;
}

:root[data-theme="dark"] .brand__mark--light {
  display: none;
}

:root[data-theme="dark"] .brand__mark--dark {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .brand__mark--light {
    display: none;
  }

  :root:not([data-theme="light"]) .brand__mark--dark {
    display: block;
  }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-2);
  border-radius: 4px;
  transition: color 160ms var(--ease);
}

.site-nav__en {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-3);
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--ink);
}

.site-nav__link.is-active {
  font-weight: 650;
}

.site-nav__link.is-active .site-nav__en {
  color: var(--accent);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 32px;
  margin-left: 8px;
  padding: 0 12px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
  cursor: pointer;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.theme-toggle:hover {
  border-color: var(--line-strong);
  color: var(--ink);
}

.theme-toggle__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
}

.nav-toggle {
  display: none;
}

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    height: 40px;
    padding: 0 4px 0 12px;
    background: transparent;
    border: 0;
    font-size: 14px;
    font-weight: 550;
    cursor: pointer;
  }

  .nav-toggle__icon {
    position: relative;
    width: 20px;
    height: 12px;
  }

  .nav-toggle__icon::before,
  .nav-toggle__icon::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    height: 1.5px;
    background: currentColor;
    transition: transform 200ms var(--ease), top 200ms var(--ease);
  }

  .nav-toggle__icon::before {
    top: 0;
  }

  .nav-toggle__icon::after {
    top: 10px;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
    top: 5px;
    transform: rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
    top: 5px;
    transform: rotate(-45deg);
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 24px;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    display: flex;
    justify-content: space-between;
    padding: 16px 0;
    font-size: 18px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    color: var(--ink);
  }

  .theme-toggle {
    align-self: flex-start;
    margin: 20px 0 0;
  }
}

/* ---------- Hero ---------- */

.hero {
  padding: clamp(48px, 6.4vw, 96px) 0 clamp(44px, 5.4vw, 80px);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(32px, 6vw, 96px);
  align-items: end;
}

.hero__eyebrow {
  color: var(--accent);
}

.hero__name {
  margin-top: 20px;
  font-size: clamp(50px, 7.2vw, 108px);
  font-weight: 620;
  line-height: 1;
  letter-spacing: -0.035em;
}

.hero__name-en {
  display: block;
  margin-top: 0.12em;
  font-weight: 300;
  color: var(--ink-3);
  letter-spacing: -0.045em;
}

.hero__statement {
  max-width: 21em;
  margin-top: clamp(24px, 3vw, 40px);
  font-size: clamp(19px, 1.9vw, 25px);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: -0.005em;
  text-wrap: balance;
}

.hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin-top: 16px;
  font-size: 14.5px;
  color: var(--ink-2);
}

.hero__facts li + li::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  margin-right: 20px;
  border-radius: 50%;
  background: var(--line-strong);
  vertical-align: middle;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(28px, 3.4vw, 44px);
}

.hero__caps {
  border-top: 1px solid var(--ink);
}

.hero__caps li {
  border-bottom: 1px solid var(--line);
}

.hero__caps a {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) auto 20px;
  align-items: baseline;
  gap: 12px;
  padding: 17px 0;
  transition: padding 220ms var(--ease);
}

.hero__caps-no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
}

.hero__caps-title {
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 560;
  letter-spacing: -0.01em;
}

.hero__caps-zh {
  font-size: 14px;
  color: var(--ink-2);
}

.hero__caps-arrow {
  color: var(--ink-3);
  transition: transform 220ms var(--ease), color 220ms var(--ease);
}

.hero__caps a:hover {
  padding-left: 8px;
}

.hero__caps a:hover .hero__caps-arrow {
  transform: translateX(4px);
  color: var(--accent);
}

@media (max-width: 960px) {
  .hero__grid {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

@media (max-width: 520px) {
  .hero__facts {
    flex-direction: column;
  }

  .hero__facts li + li::before {
    display: none;
  }

  .hero__caps a {
    grid-template-columns: 28px minmax(0, 1fr) 16px;
  }

  .hero__caps-zh {
    grid-column: 2;
    grid-row: 2;
    margin-top: -8px;
  }

  .hero__caps-arrow {
    grid-column: 3;
    grid-row: 1;
  }
}

/* ---------- Sections ---------- */

.section {
  padding: clamp(52px, 6vw, 88px) 0;
  border-top: 1px solid var(--line);
}

.section--tight {
  padding: clamp(40px, 5vw, 72px) 0;
}

.section--last {
  padding-bottom: clamp(72px, 9vw, 128px);
}

.section__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 6px 24px;
  margin-bottom: clamp(28px, 3.6vw, 52px);
}

.section__head .label {
  grid-column: 1 / -1;
}

.section__title {
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 620;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.section__more {
  font-size: 14.5px;
  font-weight: 550;
  color: var(--ink-2);
  padding-bottom: 4px;
  transition: color 160ms var(--ease);
}

.section__more:hover {
  color: var(--accent);
}

.section__note {
  grid-column: 1 / -1;
  max-width: 36em;
  margin-top: 6px;
  font-size: 15.5px;
  color: var(--ink-2);
}

/* ---------- Work cards ---------- */

.work-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(40px, 5vw, 72px) clamp(24px, 3.2vw, 48px);
}

.work-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(36px, 4vw, 56px) clamp(20px, 2.6vw, 36px);
}

.work-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.work-card__media {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--media-bg);
  outline: 1px solid color-mix(in srgb, var(--ink) 8%, transparent);
  outline-offset: -1px;
}

.work-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 600ms var(--ease);
}

.work-card:hover .work-card__media img {
  transform: scale(1.025);
}

.work-card__diagram {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(20px, 4vw, 48px);
  background: var(--diagram-bg);
  color: var(--diagram-ink);
  font-family: var(--mono);
  font-size: clamp(12px, 1.25vw, 17px);
  line-height: 2.3;
  letter-spacing: 0.01em;
  white-space: pre;
  overflow: hidden;
}

.work-card__body {
  padding-top: 18px;
}

.work-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.work-card__index {
  color: var(--accent);
}

.work-card__status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--sans);
  font-size: 12.5px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink-2);
}

.work-card__status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-3);
}

.work-card__status[data-status="已完成"]::before {
  background: #3f9b63;
}

.work-card__status[data-status="重构中"]::before,
.work-card__status[data-status="原型"]::before {
  background: #d99a1c;
}

.work-card__title {
  margin-top: 8px;
  font-size: clamp(22px, 2.1vw, 28px);
  font-weight: 620;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.work-grid--3 .work-card__title {
  font-size: 21px;
}

/* Whole card is clickable through the title link. */
.work-card__title a::after {
  content: "";
  position: absolute;
  inset: 0;
}

.work-card__title a {
  transition: color 160ms var(--ease);
}

.work-card:hover .work-card__title a {
  color: var(--accent);
}

.work-card__zh {
  font-size: 0.68em;
  font-weight: 450;
  letter-spacing: 0;
  color: var(--ink-2);
  margin-left: 4px;
}

.work-card:hover .work-card__zh {
  color: var(--ink-2);
}

.work-card__summary {
  max-width: 34em;
  margin-top: 10px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink-2);
}

.work-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-3);
}

.work-card__tags span + span::before {
  content: "·";
  margin: 0 8px;
  color: var(--line-strong);
}

.work-card__role {
  color: var(--ink);
  font-weight: 550;
}

@media (max-width: 1000px) {
  .work-grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .work-grid,
  .work-grid--3 {
    grid-template-columns: 1fr;
  }

  .work-card__zh {
    display: block;
    margin: 6px 0 0;
    font-size: 15px;
  }
}

/* ---------- Focus tiles ---------- */

.focus-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}

.focus-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px clamp(16px, 2vw, 28px) 28px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color 200ms var(--ease);
}

.focus-tile + .focus-tile {
  padding-left: clamp(16px, 2vw, 28px);
  border-left: 1px solid var(--line);
}

.focus-tile__no {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.focus-tile__title {
  margin-top: 36px;
  font-size: clamp(19px, 1.7vw, 23px);
  font-weight: 620;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.focus-tile__zh {
  margin-top: 4px;
  font-size: 14.5px;
  color: var(--ink-2);
}

.focus-tile__lead {
  margin-top: 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-2);
}

.focus-tile__projects {
  margin-top: auto;
  padding-top: 24px;
  font-size: 13.5px;
  color: var(--ink);
}

.focus-tile__projects li {
  padding: 7px 0;
  border-top: 1px solid var(--line);
}

.focus-tile__go {
  margin-top: 18px;
  font-size: 14px;
  font-weight: 550;
  color: var(--ink-2);
  transition: color 160ms var(--ease);
}

.focus-tile__go span {
  display: inline-block;
  transition: transform 220ms var(--ease);
}

.focus-tile:hover .focus-tile__go {
  color: var(--accent);
}

.focus-tile:hover .focus-tile__go span {
  transform: translateX(4px);
}

@media (max-width: 1000px) {
  .focus-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .focus-tile:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 600px) {
  .focus-grid {
    grid-template-columns: 1fr;
  }

  .focus-tile,
  .focus-tile + .focus-tile {
    padding: 24px 0;
    border-left: 0;
  }

  .focus-tile__title {
    margin-top: 14px;
  }
}

/* ---------- Rows (experience, writing, post lists) ---------- */

.rows {
  border-top: 1px solid var(--ink);
}

.row {
  display: grid;
  grid-template-columns: 148px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 8px 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  transition: padding 220ms var(--ease);
}

.row:not(:has(.row__meta)) {
  grid-template-columns: minmax(0, 1fr) auto;
}

.row__meta {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--ink-3);
}

.row__main {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.row__title {
  font-size: 17.5px;
  font-weight: 560;
  line-height: 1.45;
  letter-spacing: -0.005em;
  transition: color 160ms var(--ease);
}

.row--exp .row__title {
  font-size: 20px;
  font-weight: 620;
}

.row__sub {
  margin-left: 8px;
  font-size: 14.5px;
  font-weight: 450;
  color: var(--ink-2);
}

.row__desc {
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-2);
}

.row__go {
  font-size: 13.5px;
  color: var(--ink-3);
  white-space: nowrap;
  transition: color 160ms var(--ease);
}

.row:hover {
  padding-left: 8px;
}

.row:hover .row__title,
.row:hover .row__go {
  color: var(--accent);
}

@media (max-width: 720px) {
  .row,
  .row:not(:has(.row__meta)) {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .row__go {
    display: none;
  }

  .row--exp .row__go {
    display: block;
    margin-top: 4px;
    color: var(--ink-2);
  }

  .row__sub {
    display: block;
    margin: 2px 0 0;
  }
}

/* ---------- About block (home) ---------- */

.about-block {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 24px clamp(32px, 6vw, 96px);
}

.about-block .section__head {
  margin-bottom: 0;
  align-content: start;
}

.about-block__text {
  max-width: 30em;
  margin-bottom: 24px;
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.75;
  text-wrap: pretty;
}

@media (max-width: 800px) {
  .about-block {
    grid-template-columns: 1fr;
  }
}

/* ---------- Page heads ---------- */

.page-head {
  padding: clamp(48px, 7vw, 96px) 0 clamp(36px, 4.5vw, 64px);
}

.page-head__title {
  margin-top: 16px;
  font-size: clamp(38px, 5.6vw, 76px);
  font-weight: 620;
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.page-head__zh {
  font-size: 0.5em;
  font-weight: 450;
  letter-spacing: 0;
  color: var(--ink-2);
  white-space: nowrap;
}

.page-head__lead {
  max-width: 32em;
  margin-top: 22px;
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.7;
  color: var(--ink-2);
  text-wrap: pretty;
}

.page-head__lead a {
  color: var(--ink);
  border-bottom: 1px solid var(--line-strong);
}

.keyline {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.keyline li {
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--ink-2);
}

.chip-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.chip-nav a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 38px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  font-size: 14.5px;
  font-weight: 500;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.chip-nav a span {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--accent);
}

.chip-nav a:hover {
  border-color: var(--ink);
}

.chip-nav--lg {
  margin-top: 0;
}

.chip-nav--lg a {
  height: 48px;
  font-size: 15.5px;
}

/* ---------- Focus evidence ---------- */

.evidence {
  border-top: 1px solid var(--ink);
}

.evidence__item {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(24px, 4vw, 64px);
  padding: clamp(28px, 3.6vw, 48px) 0;
  border-bottom: 1px solid var(--line);
}

.evidence__media {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--media-bg);
  outline: 1px solid color-mix(in srgb, var(--ink) 8%, transparent);
  outline-offset: -1px;
}

.evidence__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.evidence__placeholder {
  display: grid;
  place-items: center;
  height: 100%;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.evidence__title {
  margin-top: 8px;
  font-size: clamp(22px, 2.2vw, 30px);
  font-weight: 620;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.evidence__title a:hover {
  color: var(--accent);
}

.evidence__why {
  max-width: 36em;
  margin-top: 14px;
  font-size: 16.5px;
  line-height: 1.75;
}

.evidence__points {
  max-width: 40em;
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
}

.evidence__points li {
  position: relative;
  padding: 7px 0 7px 22px;
  border-top: 1px solid var(--line);
}

.evidence__points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 1.15em;
  width: 8px;
  height: 1px;
  background: var(--accent);
}

.evidence__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: 20px;
}

.evidence__tech {
  font-size: 13px;
  color: var(--ink-3);
}

@media (max-width: 800px) {
  .evidence__item {
    grid-template-columns: 1fr;
  }
}

/* ---------- Project head ---------- */

.project-head {
  padding: clamp(48px, 7vw, 96px) 0 0;
}

.project-head__title {
  margin-top: 16px;
  font-size: clamp(38px, 5.6vw, 76px);
  font-weight: 620;
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.project-head__zh {
  display: block;
  margin-top: 0.4em;
  font-size: 0.36em;
  font-weight: 450;
  line-height: 1.4;
  letter-spacing: 0;
  color: var(--ink-2);
}

.project-head__summary {
  max-width: 30em;
  margin-top: 24px;
  font-size: clamp(18px, 1.8vw, 23px);
  line-height: 1.65;
  text-wrap: pretty;
}

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0 32px;
  margin-top: clamp(28px, 3.4vw, 44px);
  border-top: 1px solid var(--ink);
}

.facts > div {
  padding: 14px 0 16px;
  border-bottom: 1px solid var(--line);
}

.facts dt {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.facts dd {
  margin-top: 4px;
  font-size: 15px;
  line-height: 1.55;
}

.project-head__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.project-head__hero {
  margin-top: clamp(32px, 4.4vw, 60px);
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--media-bg);
  outline: 1px solid color-mix(in srgb, var(--ink) 8%, transparent);
  outline-offset: -1px;
}

.project-head__hero img {
  width: 100%;
}

@media (max-width: 520px) {
  .facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 20px;
  }

  .facts > div:has(dd:only-of-type):nth-last-child(1):nth-child(odd) {
    grid-column: 1 / -1;
  }
}

/* ---------- Post head ---------- */

.post-head {
  padding: clamp(48px, 6.4vw, 88px) 0 0;
}

.post-head__title {
  max-width: 20em;
  margin-top: 16px;
  font-size: clamp(30px, 4vw, 50px);
  font-weight: 620;
  line-height: 1.2;
  letter-spacing: -0.022em;
  text-wrap: balance;
}

.post-head__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-top: 20px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-3);
}

.post-head__meta a:hover {
  color: var(--accent);
}

/* ---------- Article grid + TOC ---------- */

.article-grid {
  display: grid;
  grid-template-columns: minmax(0, var(--measure)) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 96px);
  padding: clamp(36px, 5vw, 72px) 0 clamp(56px, 7vw, 96px);
}

.article-grid--single {
  grid-template-columns: minmax(0, var(--measure));
}

.article-aside {
  min-width: 0;
}

.toc {
  position: sticky;
  top: calc(var(--header-h) + 32px);
  max-width: 260px;
  margin-left: auto;
  max-height: calc(100vh - var(--header-h) - 64px);
  overflow: auto;
}

.toc ol {
  margin-top: 14px;
  border-left: 1px solid var(--line);
}

.toc ol ol {
  margin: 0 0 4px 12px;
  border-left: 0;
}

.toc a {
  display: block;
  padding: 5px 0 5px 14px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-3);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.toc a:hover {
  color: var(--ink);
}

.toc a.is-active {
  color: var(--ink);
  border-left-color: var(--accent);
}

@media (max-width: 1040px) {
  .article-grid {
    grid-template-columns: minmax(0, var(--measure));
  }

  .article-aside {
    display: none;
  }
}

/* ---------- Prose ---------- */

.prose {
  font-size: 17px;
  line-height: 1.85;
  min-width: 0;
}

.prose--narrow {
  max-width: var(--measure);
}

.prose > *:first-child {
  margin-top: 0;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose table,
.prose pre,
.prose figure,
.prose .table-wrap,
.prose .media {
  margin-top: 1.15em;
}

.prose h2 {
  margin-top: 2.6em;
  padding-top: 1.1em;
  border-top: 1px solid var(--line);
  font-size: clamp(23px, 2.3vw, 29px);
  font-weight: 620;
  line-height: 1.3;
  letter-spacing: -0.015em;
}

.prose h3 {
  margin-top: 2em;
  font-size: 19.5px;
  font-weight: 620;
  line-height: 1.4;
}

.prose h4 {
  margin-top: 1.8em;
  font-size: 17px;
  font-weight: 650;
}

.prose h1 {
  margin-top: 2.4em;
  font-size: clamp(25px, 2.6vw, 32px);
  font-weight: 620;
  line-height: 1.3;
  letter-spacing: -0.015em;
}

.prose--numbered {
  counter-reset: section;
}

.prose--numbered h2 {
  counter-increment: section;
}

.prose--numbered h2::before {
  content: counter(section, decimal-leading-zero);
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.prose a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: text-decoration-color 160ms var(--ease), color 160ms var(--ease);
}

.prose a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.prose strong {
  font-weight: 650;
}

.prose ul,
.prose ol {
  padding-left: 1.3em;
}

.prose ul {
  list-style: none;
}

.prose ul > li {
  position: relative;
}

.prose ul > li::before {
  content: "";
  position: absolute;
  left: -1.15em;
  top: 0.88em;
  width: 7px;
  height: 1px;
  background: var(--ink-3);
}

.prose ol {
  list-style: decimal;
}

.prose ol > li::marker {
  font-family: var(--mono);
  font-size: 0.82em;
  color: var(--ink-3);
}

.prose li + li {
  margin-top: 0.35em;
}

.prose li > ul,
.prose li > ol {
  margin-top: 0.35em;
}

.prose blockquote {
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--accent);
  color: var(--ink-2);
}

.prose blockquote > *:first-child {
  margin-top: 0;
}

.prose hr {
  display: none;
}

.prose img {
  border-radius: var(--radius);
  outline: 1px solid color-mix(in srgb, var(--ink) 8%, transparent);
  outline-offset: -1px;
  background: var(--media-bg);
}

.prose figure {
  margin-inline: 0;
}

.prose figcaption,
.prose .caption {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-3);
}

.prose code {
  padding: 0.14em 0.38em;
  border-radius: 4px;
  background: var(--code-bg);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.84em;
}

.prose pre,
.prose figure.highlight {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--code-bg);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.7;
  -webkit-overflow-scrolling: touch;
}

.prose figure.highlight pre {
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  overflow: visible;
}

.prose figure.highlight table {
  width: auto;
  margin: 0;
  border: 0;
  font-size: inherit;
}

.prose figure.highlight td {
  padding: 0;
  border: 0;
}

.prose figure.highlight .gutter {
  display: none;
}

.prose pre code {
  padding: 0;
  border: 0;
  background: transparent;
  font-size: inherit;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.6;
}

.prose .table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.prose .table-wrap table {
  margin-top: 0;
  min-width: 520px;
}

.prose th,
.prose td {
  padding: 10px 14px 10px 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.prose th {
  border-bottom-color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-2);
  white-space: nowrap;
}

.prose iframe,
.prose video {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  border: 0;
  border-radius: var(--radius);
  background: #000;
}

/* Authoring helpers used inside project pages. */

.prose .lede {
  font-size: 1.12em;
  line-height: 1.8;
}

.prose .notice {
  margin-top: 1.4em;
  padding: 16px 20px;
  border: 1px solid var(--line-strong);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--bg-raise);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-2);
}

.prose .notice strong {
  color: var(--ink);
}

.prose .stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0 24px;
  margin-top: 1.6em;
  border-top: 1px solid var(--ink);
}

.prose .stats > div {
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--line);
}

.prose .stats b {
  display: block;
  font-size: clamp(24px, 2.4vw, 31px);
  font-weight: 600;
  line-height: 1.15;
  white-space: nowrap;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.prose .stats span {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-2);
}

.prose .gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 1.4em;
}

.prose .gallery figure {
  margin: 0;
}

.prose .gallery--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.prose .gallery .tall img {
  max-height: 520px;
  width: auto;
  margin-inline: auto;
}

/* Let wide media break out of the text measure on large screens. */
@media (min-width: 1041px) {
  .project .article-grid--single .prose > figure,
  .project .article-grid--single .prose > .gallery,
  .article-grid--single .prose .bleed {
    width: min(1120px, 100vw - 2 * var(--gutter));
    max-width: none;
  }
}

@media (max-width: 600px) {
  .prose {
    font-size: 16.5px;
    line-height: 1.8;
  }

  .prose .gallery,
  .prose .gallery--3 {
    grid-template-columns: 1fr;
  }
}

/* highlight.js tokens — restrained, works in both themes */

.hljs-comment,
.hljs-quote {
  color: var(--ink-3);
  font-style: italic;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-section,
.hljs-doctag,
.hljs-type,
.hljs-name {
  color: var(--accent);
}

.hljs-string,
.hljs-attr,
.hljs-symbol,
.hljs-bullet,
.hljs-addition {
  color: #2f7d57;
}

.hljs-number,
.hljs-meta,
.hljs-built_in,
.hljs-title,
.hljs-variable,
.hljs-template-variable {
  color: #3b6ea8;
}

:root[data-theme="dark"] .hljs-string,
:root[data-theme="dark"] .hljs-attr,
:root[data-theme="dark"] .hljs-symbol,
:root[data-theme="dark"] .hljs-bullet,
:root[data-theme="dark"] .hljs-addition {
  color: #7fc8a0;
}

:root[data-theme="dark"] .hljs-number,
:root[data-theme="dark"] .hljs-meta,
:root[data-theme="dark"] .hljs-built_in,
:root[data-theme="dark"] .hljs-title,
:root[data-theme="dark"] .hljs-variable,
:root[data-theme="dark"] .hljs-template-variable {
  color: #8db4e6;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hljs-string,
  :root:not([data-theme="light"]) .hljs-attr,
  :root:not([data-theme="light"]) .hljs-symbol,
  :root:not([data-theme="light"]) .hljs-bullet,
  :root:not([data-theme="light"]) .hljs-addition {
    color: #7fc8a0;
  }

  :root:not([data-theme="light"]) .hljs-number,
  :root:not([data-theme="light"]) .hljs-meta,
  :root:not([data-theme="light"]) .hljs-built_in,
  :root:not([data-theme="light"]) .hljs-title,
  :root:not([data-theme="light"]) .hljs-variable,
  :root:not([data-theme="light"]) .hljs-template-variable {
    color: #8db4e6;
  }
}

/* ---------- Related focus ---------- */

.rel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0 clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--ink);
}

.rel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 0 26px;
  border-bottom: 1px solid var(--line);
}

.rel__no {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.rel__title {
  font-size: 17.5px;
  font-weight: 620;
  transition: color 160ms var(--ease);
}

.rel__why {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-2);
}

.rel:hover .rel__title {
  color: var(--accent);
}

/* ---------- Pager / pagination ---------- */

.pager {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 clamp(64px, 8vw, 112px);
  border-top: 1px solid var(--line);
}

.pager__all {
  font-size: 14.5px;
  font-weight: 550;
  color: var(--ink-2);
}

.pager__next {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  max-width: 28em;
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 620;
  line-height: 1.3;
  letter-spacing: -0.015em;
  text-align: right;
}

.pager a:hover {
  color: var(--accent);
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 36px;
  font-family: var(--mono);
  font-size: 13px;
}

.pagination .page-number,
.pagination .extend {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink-2);
}

.pagination .current {
  border-color: var(--ink);
  color: var(--ink);
}

.pagination a:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--ink);
  padding: clamp(40px, 5vw, 72px) 0 40px;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: end;
}

.site-footer__mail {
  display: inline-block;
  margin-top: 12px;
  font-size: clamp(24px, 3.6vw, 48px);
  font-weight: 560;
  line-height: 1.15;
  letter-spacing: -0.025em;
  transition: color 160ms var(--ease);
}

.site-footer__mail:hover {
  color: var(--accent);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-size: 14.5px;
  font-weight: 500;
}

.site-footer__links a:hover {
  color: var(--accent);
}

.site-footer__meta {
  grid-column: 1 / -1;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-3);
}

.site-footer__meta a {
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}

@media (max-width: 720px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
  }
}

/* ---------- Motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .article-aside,
  .pager {
    display: none;
  }
}