/* ==========================================================================
   Bob Zheng — portfolio
   International Typographic Style, after the Rhine Lab identity (Arknights):
   eggshell ground, warm black type, one green-black section block per
   section, hairlines, and colour used only as a signal.

    1 tokens      4 header & index rule    7 profile      10 skills
    2 base        5 frame & sections       8 experience   11 contact & footer
    3 type        6 hero                   9 research &   12 responsive
                                             projects
   ========================================================================== */

/* 1 · Tokens ------------------------------------------------------------- */
:root {
  /* Ground — sampled from the official Rhine Lab: Access film (#F0F0E4 → #E4E4DE) */
  --ground: #efeee7;
  --ground-2: #e6e5dd;
  --panel: #f7f6f1;

  /* Ink — warm black; the section block carries Rhine Lab's green-black (#0C120C) */
  --ink: #141612;
  --block: #101611;
  --ink-2: #3d413b;
  --ink-3: #61655e;
  --on-block: #f2f1ea;
  --on-block-2: #c4c8c0;
  --tab: #d3d5cf;

  --rule: #cfcdc5;
  --rule-2: #b4b2a9;

  /* Signals — used on a few pixels, never as fields */
  --signal: #c8693e;      /* Rhine orange (HQ, road markings) */
  --signal-ink: #a14f29;  /* orange that passes contrast as text */
  --lime: #9bd62a;        /* position / active marker */

  --font-display: "Montserrat", "Gotham", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-text: "Inter", "Helvetica Neue", Arial, system-ui, sans-serif;

  --max: 1600px;
  --gutter: clamp(20px, 3.4vw, 48px);
  --side: clamp(220px, 21vw, 300px);
  --gap-main: clamp(32px, 4vw, 64px);
  --bar: 76px;

  --ease: cubic-bezier(0.2, 0, 0, 1);

  color-scheme: light;
}

/* 2 · Base --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 400 16px/1.6 var(--font-text);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

p, h1, h2, h3, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; }
button { font: inherit; color: inherit; }
b, strong { font-weight: 600; }
table { border-collapse: collapse; }

:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
main:focus { outline: none; }
::selection { background: var(--ink); color: var(--ground); }

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.skip {
  position: fixed; left: 12px; top: 12px; z-index: 100;
  padding: 12px 16px; background: var(--block); color: var(--on-block);
  font: 600 12px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase; text-decoration: none;
  transform: translateY(-200%);
}
.skip:focus { transform: none; }

.ico {
  display: inline-block; flex: none; width: 14px; height: 14px;
  fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: square;
  transition: transform .2s var(--ease);
}

/* 3 · Type primitives ---------------------------------------------------- */
/* The short heavy bar Rhine Lab sets before its labels ("▬ ECOLOGICAL SECTION") */
.dash { display: inline-block; width: 18px; height: 4px; margin-right: 10px; background: var(--ink); vertical-align: middle; }

.label {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px;
  font: 700 11px/1.2 var(--font-display); letter-spacing: .1em; text-transform: uppercase;
}
.label::before { content: ""; width: 18px; height: 4px; background: var(--ink); flex: none; }

.lead {
  max-width: 34ch;
  font: 400 clamp(22px, 2.1vw, 30px)/1.32 var(--font-text);
  letter-spacing: -.012em;
}
.body { margin-top: 22px; color: var(--ink-2); }
.measure { max-width: 66ch; }

.lamp {
  display: inline-block; flex: none; width: 8px; height: 8px;
  background: var(--lime); box-shadow: 0 0 0 1px rgba(20, 22, 18, .28);
}

.btn {
  display: inline-flex; align-items: center; gap: 14px;
  min-height: 48px; padding: 0 20px;
  border: 1px solid var(--block); background: var(--block); color: var(--on-block);
  font: 600 12px/1 var(--font-display); letter-spacing: .12em; text-transform: uppercase; text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.btn:hover { background: transparent; color: var(--ink); }
.btn:hover .ico { transform: translateX(3px); }
.btn[href$=".pdf"]:hover .ico { transform: translateY(2px); }
.btn--quiet { background: transparent; color: var(--ink); }
.btn--quiet:hover { background: var(--block); color: var(--on-block); }

.points { display: grid; gap: 10px; color: var(--ink-2); }
.points li { position: relative; padding-left: 20px; }
.points li::before { content: ""; position: absolute; left: 2px; top: .66em; width: 5px; height: 5px; background: var(--ink-3); }
.points a { color: var(--ink); text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 3px; }

.stackline {
  margin-top: 18px;
  font: 600 11px/1.6 var(--font-display); letter-spacing: .07em; text-transform: uppercase;
  color: var(--ink-3);
}

/* Data rows: small-caps key, plain value */
.facts { border-top: 2px solid var(--ink); }
.facts div { display: grid; grid-template-columns: 136px minmax(0, 1fr); gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.facts dt { padding-top: 3px; font: 600 11px/1.4 var(--font-display); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.facts dd { font-size: 15px; line-height: 1.5; }

/* Name tag — Rhine Lab's personnel tag: role / NAME / hairline / credential */
.nametag { display: grid; grid-template-columns: minmax(0, 1fr) auto; column-gap: 24px; align-items: end; }
.nametag__role {
  grid-column: 1 / -1; margin-bottom: 8px;
  font: 600 11px/1.2 var(--font-display); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2);
}
.nametag__name { grid-column: 1; font: 700 clamp(24px, 2.3vw, 32px)/1.05 var(--font-display); letter-spacing: -.005em; text-transform: uppercase; }
.nametag__when {
  grid-column: 2; grid-row: 2; padding-bottom: 4px;
  font: 600 11px/1.2 var(--font-display); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap;
}
.nametag::after { content: ""; grid-column: 1 / -1; grid-row: 3; height: 1px; margin: 12px 0 10px; background: var(--ink); }
.nametag__cred {
  grid-column: 1 / -1; grid-row: 4;
  font: 500 12px/1.4 var(--font-display); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2);
}
.nametag__cred b { font-weight: 700; color: var(--ink); }

.status {
  display: inline-flex; align-items: center; gap: 7px; margin-right: 12px; vertical-align: 1px;
  padding: 4px 8px; border: 1px solid var(--rule-2);
  font: 600 10px/1 var(--font-display); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3);
}
.status::before { content: ""; width: 6px; height: 6px; background: var(--rule-2); }
.is-active .status { border-color: var(--block); background: var(--block); color: var(--on-block); }
.is-active .status::before { background: var(--lime); }

.flag {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 11px; background: var(--block); color: var(--on-block);
  font: 600 11px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase;
}
.flag::before { content: ""; width: 6px; height: 6px; background: var(--lime); }

/* 4 · Header & index rule ------------------------------------------------ */
.bar {
  position: fixed; inset: 0 0 auto; z-index: 50;
  height: var(--bar);
  background: var(--ground);
  border-bottom: 1px solid var(--rule);
}
.bar__inner {
  display: grid; grid-template-columns: var(--side) minmax(0, 1fr) auto; align-items: center;
  max-width: var(--max); height: 100%; margin: 0 auto; padding: 0 var(--gutter);
}

/* Mirrors "RHINE LAB / SYNTHESIZE INFORMATION / ANALYSIS OS" */
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; justify-self: start; }
.brand__mark {
  display: grid; place-items: center; flex: none;
  width: 40px; height: 40px; background: var(--block); color: var(--on-block);
  font: 800 13px/1 var(--font-display); letter-spacing: .02em;
}
.brand__text { display: grid; gap: 6px; line-height: 1; }
.brand__name { font: 700 16px/1 var(--font-display); letter-spacing: .03em; text-transform: uppercase; }
.brand__tag { font: 500 10px/1 var(--font-display); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); }

.nav { padding-left: var(--gap-main); }
.nav__list { display: flex; flex-wrap: wrap; gap: 6px clamp(16px, 2vw, 30px); }
.nav__link {
  position: relative; display: inline-flex; align-items: baseline; gap: 6px;
  padding: 10px 0;
  font: 600 12px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-3); text-decoration: none;
  transition: color .2s var(--ease);
}
.nav__n { font-size: 10px; font-weight: 500; }
.nav__link::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 2px; height: 2px;
  background: var(--signal); transform: scaleX(0); transform-origin: left;
  transition: transform .25s var(--ease);
}
.nav__link:hover, .nav__link[aria-current="true"] { color: var(--ink); }
.nav__link[aria-current="true"]::after { transform: scaleX(1); }

.bar__cta {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 40px; padding: 0 16px;
  border: 1px solid var(--ink);
  font: 600 12px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink); text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.bar__cta:hover { background: var(--block); color: var(--on-block); }
.bar__cta:hover .ico { transform: translateY(2px); }

.menu {
  display: none; min-height: 40px; padding: 0 16px;
  border: 1px solid var(--ink); background: transparent;
  font: 600 12px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase; cursor: pointer;
}

/* The full-height rule at the column boundary, with a lime marker for position */
.rule {
  display: none;
  position: fixed; z-index: 40; top: var(--bar); bottom: 0;
  left: calc(max(0px, (100% - var(--max)) / 2) + var(--gutter) + var(--side));
  width: 1px; background: var(--rule-2); pointer-events: none;
}
.rule__marker {
  position: absolute; left: -7px; top: calc(var(--p, 0) * (100% - 10px));
  width: 15px; height: 10px; background: var(--lime);
}

/* 5 · Frame & sections --------------------------------------------------- */
/* Every band shares one grid: the index column, the rule, then content. */
.frame {
  display: grid; grid-template-columns: var(--side) minmax(0, 1fr);
  max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter);
}
.frame__side { min-width: 0; padding-right: 24px; }
.frame__main { min-width: 0; padding-left: var(--gap-main); }

.section { padding: clamp(88px, 10vw, 152px) 0; }
.section--sunk { background: var(--ground-2); }
.section .frame__side { position: sticky; top: calc(var(--bar) + 56px); align-self: start; }

/* Section block — one per section, the single heavy element on screen */
.block {
  position: relative;
  display: grid; align-content: end;
  max-width: 252px; min-height: 172px;
  padding: 22px 18px 16px;
  background: var(--block); color: var(--on-block);
}
.block::after { content: ""; position: absolute; top: 12px; right: 12px; width: 7px; height: 7px; border-radius: 50%; background: var(--on-block-2); }
.block__tab {
  position: absolute; top: -11px; left: 18px;
  padding: 6px 10px 5px; background: var(--tab); color: var(--ink-2);
  font: 600 10px/1 var(--font-display); letter-spacing: .14em; text-transform: uppercase;
}
.block__code { font: 800 clamp(40px, 3.6vw, 58px)/.86 var(--font-display); letter-spacing: -.01em; }
.block__name {
  margin-top: 12px;
  font: 600 10.5px/1.3 var(--font-display); letter-spacing: .1em; text-transform: uppercase; color: var(--on-block-2);
}
.side-note {
  margin-top: 22px;
  font: 600 11px/1.7 var(--font-display); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3);
}
.side-note::before { content: ""; display: block; width: 18px; height: 4px; margin-bottom: 12px; background: var(--ink); }

/* 6 · Hero --------------------------------------------------------------- */
.hero {
  position: relative; isolation: isolate;
  display: flex; min-height: 100vh; min-height: 100svh;
  padding-top: var(--bar);
  overflow: hidden; overflow: clip;
}
.hero .frame { width: 100%; padding-top: clamp(48px, 10vh, 128px); padding-bottom: clamp(36px, 7vh, 72px); }
.hero .frame__side { display: flex; flex-direction: column; justify-content: space-between; gap: 40px; }
.hero__index { font: 700 11px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase; }
.facts--side { border-top: 0; }
.facts--side div { grid-template-columns: 1fr; gap: 4px; padding: 10px 0; }
.facts--side dd { font: 500 13px/1.4 var(--font-display); letter-spacing: .02em; }

.hero__main { display: flex; flex-direction: column; justify-content: center; }
.nametag--hero .nametag__role { font-size: 13px; margin-bottom: 14px; }
.nametag--hero .nametag__name { font: 800 clamp(64px, 9.2vw, 148px)/.88 var(--font-display); letter-spacing: -.025em; }
.nametag--hero::after { margin: 22px 0 14px; }
.nametag--hero .nametag__cred { font-size: 13px; }

.hero__lede { max-width: 34ch; margin-top: clamp(32px, 5vh, 56px); font: 400 clamp(20px, 1.8vw, 26px)/1.38 var(--font-text); letter-spacing: -.01em; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.links { display: flex; flex-wrap: wrap; gap: 0 28px; margin-top: 18px; }
.links a {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px;
  font: 600 12px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-2); text-decoration: none;
}
.links a:hover { color: var(--ink); text-decoration: underline; text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 6px; }
.hero__status {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px;
  margin-top: clamp(40px, 7vh, 88px); padding-top: 16px; border-top: 1px solid var(--rule);
  font-size: 14px; color: var(--ink-2);
}
.hero__status-k { font: 700 11px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase; color: var(--ink); }

/* One quiet figure: concentric rings (Rhine Lab HQ, Müller-Brockmann, a Braun dial) */
.rings {
  position: absolute; z-index: -1; pointer-events: none;
  width: clamp(420px, 50vw, 860px);
  right: calc(-1 * clamp(120px, 13vw, 260px));
  top: calc(var(--bar) + 6vh);
}
.rings circle { fill: none; stroke: var(--rule); stroke-width: 1; vector-effect: non-scaling-stroke; }
.rings__arc { fill: none; stroke: var(--signal); stroke-width: 3; vector-effect: non-scaling-stroke; stroke-dasharray: 200; stroke-dashoffset: 200; animation: arc-in 1.4s var(--ease) .4s forwards; }
.rings__dot { fill: var(--signal); }

/* 7 · Profile ------------------------------------------------------------ */
.cols { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: clamp(32px, 4vw, 64px); margin-top: clamp(44px, 5vw, 72px); }
.cols--even { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.stack-v { display: grid; gap: 40px; align-content: start; }

.current li { display: flex; align-items: baseline; gap: 12px; padding: 12px 0; border-top: 1px solid var(--rule); line-height: 1.5; }
.current li:last-child { border-bottom: 1px solid var(--rule); }
.current .lamp { transform: translateY(-1px); }
.current__fallback { display: none !important; }
.status-on .current li.is-complete, .status-on .current li.is-scheduled { display: none; }
.status-on .current.is-empty .current__fallback { display: flex !important; }

.dated li { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 16px; padding: 12px 0; border-top: 1px solid var(--rule); line-height: 1.5; }
.dated li:last-child { border-bottom: 1px solid var(--rule); }
.dated__when { padding-top: 3px; font: 600 11px/1.4 var(--font-display); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.dated--wide li { grid-template-columns: 120px minmax(0, 1fr); }

/* 8 · Experience --------------------------------------------------------- */
.records { border-top: 2px solid var(--ink); }
.rec { padding: clamp(32px, 3.6vw, 48px) 0; }
.rec + .rec { border-top: 1px solid var(--rule); }
.rec .points { margin-top: 22px; max-width: 76ch; }

.earlier { margin-top: clamp(56px, 7vw, 96px); }
.table { width: 100%; font-size: 14px; }
.table th {
  padding: 0 16px 10px 0; text-align: left; border-bottom: 2px solid var(--ink);
  font: 600 10.5px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3);
}
.table td { padding: 13px 16px 13px 0; border-bottom: 1px solid var(--rule); vertical-align: top; line-height: 1.5; color: var(--ink-2); }
.table td:first-child { white-space: nowrap; font: 600 12px/1.6 var(--font-display); letter-spacing: .04em; color: var(--ink); }
.table td:nth-child(2) { color: var(--ink); font-weight: 500; }

/* 9 · Research & projects ------------------------------------------------ */
.paper__title { margin-top: 28px; }
.paper__acronym { display: block; font: 800 clamp(64px, 7vw, 112px)/.88 var(--font-display); letter-spacing: -.025em; }
.paper__full {
  display: block; max-width: 34ch; margin-top: 16px;
  font: 600 clamp(17px, 1.6vw, 22px)/1.28 var(--font-display); letter-spacing: .02em; text-transform: uppercase;
}
.paper__authors { margin-top: 18px; padding-bottom: 24px; border-bottom: 1px solid var(--rule); font-size: 14px; color: var(--ink-3); }
.paper__authors b { color: var(--ink); }

.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 40px 0 32px; border-top: 2px solid var(--ink); }
.steps li { display: grid; align-content: start; gap: 8px; padding: 16px 20px 0 0; }
.steps li + li { padding-left: 20px; border-left: 1px solid var(--rule); }
.steps__n { font: 600 11px/1 var(--font-display); letter-spacing: .1em; color: var(--ink-3); }
.steps__k { font: 700 18px/1 var(--font-display); letter-spacing: .04em; text-transform: uppercase; }
.steps__v { font-size: 14px; line-height: 1.55; color: var(--ink-2); }

.figure { padding: clamp(16px, 2.6vw, 32px); background: var(--panel); border: 1px solid var(--rule); }
.figure figcaption { margin-top: 16px; font: 500 11px/1.5 var(--font-display); letter-spacing: .03em; color: var(--ink-3); }
.schematic { display: block; width: 100%; height: auto; }
.schematic text { font-family: var(--font-display); font-weight: 600; fill: var(--ink-2); }
.schematic .s-label { font-size: 12px; font-weight: 700; letter-spacing: .08em; fill: var(--ink); }
.schematic .s-sub { font-size: 10px; letter-spacing: .08em; }
.schematic .s-label--inv { fill: var(--on-block); }
.schematic .s-sub--inv { fill: var(--on-block-2); }
.schematic .s-chip-t { font-size: 12px; font-weight: 700; fill: var(--ink); }
.schematic .s-eq { font-size: 12px; fill: var(--signal-ink); }
.schematic .s-hit { fill: var(--signal-ink); }
.s-box { fill: var(--panel); stroke: var(--ink); stroke-width: 1.2; }
.s-box--out { fill: var(--block); stroke: var(--block); }
.s-line, .s-rule { fill: none; stroke: var(--ink-3); stroke-width: 1.2; }
.s-chip { fill: var(--ground); stroke: var(--ink); stroke-width: 1.2; }
.s-inject, .s-inject-head { fill: none; stroke: var(--signal); stroke-width: 2; }
.s-inject { stroke-dasharray: 5 4; }
.s-layers rect { fill: var(--ground-2); stroke: var(--ink-3); stroke-width: 1; }
.s-layers rect.is-hit { fill: var(--signal); stroke: var(--signal); }

.actions-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.threads { margin-top: clamp(56px, 7vw, 96px); }

.panel { padding: clamp(24px, 3vw, 40px); background: var(--panel); border: 1px solid var(--rule); }
.panel .nametag__name { font-size: clamp(40px, 4.4vw, 64px); font-weight: 800; letter-spacing: -.02em; }
.panel .points { margin-top: 24px; max-width: 76ch; }
.facts--inline { margin-top: 28px; }
.facts--inline div { grid-template-columns: 112px minmax(0, 1fr); }

.index { margin-top: clamp(48px, 6vw, 80px); border-top: 2px solid var(--ink); }
.op { border-bottom: 1px solid var(--rule); }
.op summary { list-style: none; cursor: pointer; }
.op summary::-webkit-details-marker { display: none; }
.op summary:focus-visible { outline-offset: -2px; }
.op__row {
  display: grid; grid-template-columns: 40px minmax(0, 1.1fr) minmax(0, 1.5fr) 84px 20px;
  column-gap: 16px; align-items: baseline;
  padding: 18px 0;
}
.op__n { font: 600 11px/1 var(--font-display); letter-spacing: .06em; color: var(--ink-3); }
.op__name { font: 700 16px/1.3 var(--font-display); letter-spacing: .03em; text-transform: uppercase; }
.op__brief { font-size: 15px; line-height: 1.45; color: var(--ink-2); }
.op__year { text-align: right; white-space: nowrap; font: 600 12px/1 var(--font-display); letter-spacing: .04em; color: var(--ink-2); }
.op__toggle { position: relative; justify-self: end; align-self: center; width: 12px; height: 12px; }
.op__toggle::before, .op__toggle::after { content: ""; position: absolute; left: 0; right: 0; top: 5px; height: 2px; background: var(--ink); transition: transform .2s var(--ease); }
.op__toggle::after { transform: rotate(90deg); }
.op[open] .op__toggle::after { transform: rotate(0deg); }
.op summary:hover .op__name { text-decoration: underline; text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 5px; }
.op__body { max-width: 900px; padding: 0 0 28px 56px; }
.op__meta { margin-bottom: 14px; font: 600 11px/1.5 var(--font-display); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.op__links { display: flex; flex-wrap: wrap; gap: 4px 24px; margin-top: 14px; }
.op__links a {
  display: inline-flex; align-items: center; gap: 8px; min-height: 40px;
  font: 600 12px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase; text-decoration: none;
}
.op__links a:hover { text-decoration: underline; text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 6px; }

/* 10 · Skills ------------------------------------------------------------ */
.grid4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(20px, 2.6vw, 40px); }
.plain li { padding: 8px 0; border-top: 1px solid var(--rule); font-size: 15px; line-height: 1.4; }
.plain li:last-child { border-bottom: 1px solid var(--rule); }

/* 11 · Contact & footer -------------------------------------------------- */
.channels { margin-top: clamp(40px, 5vw, 64px); border-top: 2px solid var(--ink); }
.channel { display: flex; align-items: center; gap: 12px; border-bottom: 1px solid var(--rule); }
.channel__link {
  flex: 1; min-width: 0;
  display: grid; grid-template-columns: 140px minmax(0, 1fr) auto; align-items: center; gap: 16px;
  min-height: 84px; color: var(--ink); text-decoration: none;
}
.channel__k { font: 600 11px/1 var(--font-display); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.channel__v { font: 600 clamp(20px, 2.4vw, 34px)/1.15 var(--font-display); letter-spacing: -.005em; }
.channel__link .ico { width: 20px; height: 20px; }
.channel__link:hover .channel__v { text-decoration: underline; text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 7px; }
.channel__link:hover .ico { transform: translateX(4px); }
.channel__link[href$=".pdf"]:hover .ico { transform: translateY(3px); }
.copy {
  flex: none; min-height: 40px; padding: 0 14px;
  border: 1px solid var(--ink); background: transparent; cursor: pointer;
  font: 600 11px/1 var(--font-display); letter-spacing: .12em; text-transform: uppercase;
}
.copy:hover, .copy.is-done { background: var(--block); color: var(--on-block); }

.footer { border-top: 1px solid var(--rule); }
.footer__inner {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px 32px;
  max-width: var(--max); margin: 0 auto; padding: 28px var(--gutter) 36px;
  font: 600 11px/1.5 var(--font-display); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2);
}
.footer a { display: inline-flex; align-items: center; gap: 8px; min-height: 32px; text-decoration: none; }
.footer a:hover { color: var(--ink); text-decoration: underline; text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 5px; }

@keyframes arc-in { to { stroke-dashoffset: 0; } }

/* 12 · Responsive -------------------------------------------------------- */
@media (min-width: 1101px) {
  .js .rule { display: block; }
}

@media (max-width: 1240px) {
  .bar__inner { grid-template-columns: auto minmax(0, 1fr) auto auto; gap: 12px; }
  .menu { display: inline-flex; align-items: center; }
  .nav {
    position: fixed; inset: var(--bar) 0 0; z-index: 49;
    display: none; padding: 24px var(--gutter);
    background: var(--ground); border-top: 1px solid var(--rule);
  }
  .menu-open .nav { display: block; }
  .menu-open body { overflow: hidden; }
  .nav__list { flex-direction: column; gap: 0; border-top: 2px solid var(--ink); }
  .nav__link {
    display: flex; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--rule);
    font-size: clamp(22px, 4.6vw, 32px); font-weight: 700; letter-spacing: .02em; color: var(--ink);
  }
  .nav__n { font-size: 12px; color: var(--ink-3); }
  .nav__link::after { bottom: -1px; }
  .bar__cta { grid-column: 3; }
}

@media (max-width: 1100px) {
  .frame { grid-template-columns: minmax(0, 1fr); }
  .frame__side { padding-right: 0; }
  .frame__main { padding-left: 0; }
  .section .frame__side { position: static; margin-bottom: 40px; }
  .hero .frame__side { order: 2; flex-direction: row; flex-wrap: wrap; align-items: end; margin-top: 48px; }
  .facts--side { display: flex; gap: 32px; }
  .rings { width: clamp(360px, 80vw, 640px); right: -30vw; top: calc(var(--bar) + 2vh); }
}

@media (max-width: 760px) {
  :root { --bar: 64px; }
  .brand__tag { display: none; }
  .bar__cta { display: none; }
  .bar__inner { grid-template-columns: auto minmax(0, 1fr) auto; }
  .menu { grid-column: 3; }
  .cols, .cols--even { grid-template-columns: minmax(0, 1fr); }
  .grid4 { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 36px; }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .steps li + li { padding-left: 0; border-left: 0; border-top: 1px solid var(--rule); margin-top: 16px; }
  .figure { display: none; }
  .nametag { grid-template-columns: minmax(0, 1fr); }
  .nametag__role { order: 1; }
  .nametag__when { grid-column: 1; grid-row: auto; order: 2; padding: 0 0 8px; }
  .nametag__name { order: 3; }
  .nametag::after { grid-row: auto; order: 4; }
  .nametag__cred { grid-row: auto; order: 5; }
  .hero .frame__side, .rings { display: none; }
  .facts div { grid-template-columns: 112px minmax(0, 1fr); }
  .table thead { display: none; }
  .table tr { display: grid; gap: 4px; padding: 14px 0; border-bottom: 1px solid var(--rule); }
  .table td { padding: 0; border: 0; }
  .op__row { grid-template-columns: 32px minmax(0, 1fr) auto 16px; row-gap: 6px; }
  .op__brief { grid-column: 2 / -1; grid-row: 2; }
  .op__body { padding-left: 48px; }
  .channel__link { grid-template-columns: minmax(0, 1fr) auto; row-gap: 8px; padding: 18px 0; }
  .channel__k { grid-column: 1; }
  .channel__v { grid-column: 1; }
  .channel__link .ico { grid-column: 2; grid-row: 1 / span 2; }
  .hero__actions .btn { flex: 1 1 100%; justify-content: space-between; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 1ms !important; animation-duration: 1ms !important; }
}

@media print {
  .bar, .rule, .rings, .copy { display: none !important; }
  .hero { min-height: 0; }
  .section .frame__side { position: static; }
}