/* WhatsBackUp — an archive's website, built to look like an archive.
   ------------------------------------------------------------------
   Paper and ink, hairline rules, catalogue numbers, one vermilion accent used
   like a rubber stamp. No gradients, no glows, no rounded cards, no icon
   roundels — the type does the work.

   Still zero external requests: system serif, system mono, inline SVG. */

:root {
  color-scheme: light dark;

  --paper:    #f4f1e8;
  --paper-2:  #ebe6d9;
  --paper-3:  #e2dcca;
  --ink:      #16140e;
  --ink-2:    #4b4536;
  --ink-3:    #6d6551;
  --rule:     #d3cbb6;
  --rule-2:   #b9ae94;
  --accent:   #a83518;          /* archival vermilion, used sparingly */
  --accent-2: #7d2711;
  --on-accent:#fdf9f0;

  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", ui-serif, serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;

  --measure: 34rem;
  --gut: clamp(20px, 4.5vw, 56px);
  --maxw: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* The darkroom: the same paper seen under safelight. */
    --paper:    #13110d;
    --paper-2:  #1a1712;
    --paper-3:  #221e17;
    --ink:      #f2eee2;
    --ink-2:    #b8ae99;
    --ink-3:    #968c78;
    --rule:     #302b22;
    --rule-2:   #453e31;
    --accent:   #e0714f;
    --accent-2: #ee8e6f;
    --on-accent:#17130e;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  margin: 0;
  background-color: var(--paper);
  /* A whisper of tooth, so it reads as stock rather than a screen. */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.035'/%3E%3C/svg%3E");
  color: var(--ink);
  font: 400 17.5px/1.62 var(--serif);
  font-synthesis-weight: none;
}
@media (prefers-color-scheme: dark) { body { background-image: none; } }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut); }

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 2.5px; text-decoration-color: var(--rule-2); }
a:hover { text-decoration-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.skip { position: absolute; left: -9999px; background: var(--ink); color: var(--paper); padding: 10px 16px; z-index: 99; }
.skip:focus { left: 0; top: 0; }

/* ---------- type ---------- */
h1, h2, h3 { font-weight: 400; margin: 0; letter-spacing: -.012em; }
h1 { font-size: clamp(2.5rem, 6.4vw, 4.6rem); line-height: 1.02; letter-spacing: -.028em; }
h2 { font-size: clamp(1.75rem, 3.6vw, 2.7rem); line-height: 1.1; letter-spacing: -.02em; }
h3 { font-size: 1.16rem; line-height: 1.3; }
p { margin: 0 0 1.05em; }
em { font-style: italic; }
strong, b { font-weight: 700; }

.lede { font-size: clamp(1.12rem, 1.9vw, 1.42rem); line-height: 1.5; color: var(--ink-2); max-width: var(--measure); }
.measure { max-width: var(--measure); }

/* The one voice that is not the serif: labels, numbers, catalogue references. */
/* Mono is for labels, references and figures — not for prose. Row headings in
   the ledger are phrases, so they stay in the serif with the rest of the text. */
.label, .marker, .mono, .nav a, .btn, .stat b, thead th, .spec dt, .manifest, .tag {
  font-family: var(--mono);
}
.label {
  display: block; font-size: .69rem; letter-spacing: .19em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 1.1em;
}
.label .no { color: var(--accent); }

/* ---------- rules ---------- */
hr { border: 0; border-top: 1px solid var(--rule); margin: 0; }
.rule-top { border-top: 1px solid var(--rule); }

/* ---------- header ---------- */
.site-head { border-bottom: 1px solid var(--rule); background: var(--paper); position: sticky; top: 0; z-index: 40; }
.site-head .wrap { display: flex; align-items: baseline; gap: 26px; padding-top: 17px; padding-bottom: 15px; }
.brand { text-decoration: none; display: flex; align-items: baseline; gap: 9px; }
.brand .mark {
  font-family: var(--serif); font-size: 1.28rem; letter-spacing: -.02em; white-space: nowrap;
}
.brand .mark i { font-style: normal; color: var(--accent); }
.brand .ref { font-family: var(--mono); font-size: .6rem; letter-spacing: .16em; color: var(--ink-3); text-transform: uppercase; }
.nav { margin-left: auto; display: flex; align-items: baseline; gap: 22px; }
.nav a { font-size: .74rem; letter-spacing: .13em; text-transform: uppercase; text-decoration: none; color: var(--ink-2); }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }
.nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: 5px; text-decoration-color: var(--accent); }
@media (max-width: 700px) { .nav a.hide-sm { display: none; } .site-head .wrap { gap: 16px; } .nav { gap: 15px; } }
/* Below this the brand and the nav cannot share a line. Wrapping keeps every
   link reachable; hiding them would just move the problem to the visitor. */
@media (max-width: 620px) {
  .site-head .wrap { flex-wrap: wrap; row-gap: 11px; padding-bottom: 12px; }
  .nav { margin-left: 0; width: 100%; gap: 18px; }
}

/* ---------- buttons: solid ink, square, no glow ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 20px; font-size: .78rem; letter-spacing: .13em; text-transform: uppercase;
  text-decoration: none; border: 1px solid var(--ink); background: var(--ink); color: var(--paper);
  transition: background .13s linear, color .13s linear;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn-2 { background: transparent; color: var(--ink); }
.btn-2:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn svg { width: 15px; height: 15px; }

/* ---------- sections ---------- */
section { padding: clamp(52px, 8vw, 104px) 0; }
section + section { border-top: 1px solid var(--rule); }
/* The header is sticky, so an anchor jump would otherwise land with the heading
   tucked underneath it. */
section[id], [id] > h2, .register li[id] { scroll-margin-top: 96px; }
.tint { background: var(--paper-2); }

/* Section head: the marker sits in the margin like a finding-aid reference. */
.head { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 0 clamp(16px, 3vw, 40px); margin-bottom: clamp(30px, 4.5vw, 54px); }
.head .marker { font-size: .69rem; letter-spacing: .19em; text-transform: uppercase; color: var(--accent); padding-top: .55em; }
.head .marker span { display: block; color: var(--ink-3); margin-top: .5em; letter-spacing: .13em; }
.head p { color: var(--ink-2); max-width: var(--measure); margin: .85em 0 0; }
@media (max-width: 720px) { .head { grid-template-columns: 1fr; } .head .marker { padding: 0 0 12px; } .head .marker span { display: inline; margin-left: 12px; } }

/* ---------- hero ---------- */
.hero { padding: clamp(46px, 7.5vw, 92px) 0 clamp(40px, 6vw, 76px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr); gap: clamp(34px, 5vw, 68px); align-items: end; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; align-items: start; } }
.hero h1 { margin-bottom: .38em; }
.hero h1 .q { color: var(--accent); }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 2em 0 1em; }
.hero .fine { font-family: var(--mono); font-size: .69rem; letter-spacing: .09em; color: var(--ink-3); text-transform: uppercase; }

/* ---------- contact sheet ---------- */
.sheet { margin: 0; border: 1px solid var(--rule-2); background: var(--paper-2); padding: 13px; }
.sheet-bar { display: flex; justify-content: space-between; gap: 12px; font-family: var(--mono); font-size: .6rem; letter-spacing: .15em; text-transform: uppercase; color: var(--ink-3); padding-bottom: 11px; }
.frames { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; }
.frame { position: relative; aspect-ratio: 1; border: 1px solid var(--rule-2); overflow: hidden; }
.frame .n {
  position: absolute; left: 0; bottom: 0; font-family: var(--mono); font-size: .52rem; letter-spacing: .09em;
  background: rgba(10, 9, 6, .62); color: #f2eee2; padding: 2px 5px;
}
.frame.gone { background: var(--paper-3); border-style: dashed; border-color: var(--rule-2); display: grid; place-items: center; }
.frame.gone .x {
  font-family: var(--mono); font-size: .5rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent); text-align: center; line-height: 1.45; padding: 0 6px;
}
.frame.gone .n { background: none; color: var(--ink-3); }
.sheet figcaption { font-family: var(--mono); font-size: .63rem; line-height: 1.7; letter-spacing: .05em; color: var(--ink-3); padding-top: 12px; }
.sheet figcaption b { color: var(--accent); font-weight: 400; }

/* ---------- numbered register (the problem list) ---------- */
.register { list-style: none; margin: 0; padding: 0; }
.register li { display: grid; grid-template-columns: 3.4rem minmax(0, 1fr); gap: 0 clamp(14px, 2vw, 26px); padding: clamp(18px, 2.4vw, 26px) 0; border-top: 1px solid var(--rule); }
.register li:last-child { border-bottom: 1px solid var(--rule); }
.register .n { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; color: var(--accent); padding-top: .45em; }
.register h3 { margin-bottom: .3em; }
.register p { color: var(--ink-2); margin: 0; max-width: 46rem; }

/* ---------- steps ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }
.steps li { padding: 0 clamp(16px, 2.4vw, 32px); border-left: 1px solid var(--rule); }
.steps li:first-child { padding-left: 0; border-left: 0; }
.steps li:last-child { padding-right: 0; }
.steps .n { font-family: var(--mono); font-size: 2.6rem; line-height: 1; color: var(--rule-2); display: block; margin-bottom: .42em; }
.steps h3 { margin-bottom: .34em; }
.steps p { color: var(--ink-2); margin: 0; font-size: .97rem; }
@media (max-width: 780px) {
  .steps { grid-template-columns: 1fr; }
  .steps li { padding: 26px 0; border-left: 0; border-top: 1px solid var(--rule); }
  .steps li:first-child { padding-top: 0; border-top: 0; }
  .steps .n { font-size: 1.7rem; }
}

/* ---------- definition register (features, specs) ---------- */
.defs { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(28px, 5vw, 64px); }
@media (max-width: 760px) { .defs { grid-template-columns: 1fr; } }
.defs > div { padding: clamp(17px, 2.2vw, 24px) 0; border-top: 1px solid var(--rule); }
.defs dt { font-size: 1.1rem; margin-bottom: .3em; }
.defs dd { margin: 0; color: var(--ink-2); font-size: .97rem; }

/* ---------- specification table ---------- */
.spec { margin: 0; }
.spec > div { display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 0 clamp(16px, 3vw, 40px); padding: 13px 0; border-top: 1px solid var(--rule); }
.spec > div:last-child { border-bottom: 1px solid var(--rule); }
.spec dt { font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); padding-top: .3em; }
.spec dd { margin: 0; color: var(--ink); }
.spec .no-, .spec .yes- { font-family: var(--mono); font-size: .82em; letter-spacing: .06em; }
.spec .no- { color: var(--accent); }
@media (max-width: 700px) { .spec > div { grid-template-columns: 1fr; gap: 4px; } }

/* ---------- ledger table ---------- */
.ledger { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; min-width: 640px; }
caption { text-align: left; font-family: var(--mono); font-size: .66rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); padding-bottom: 14px; }
th, td { text-align: left; padding: 13px 16px 13px 0; border-bottom: 1px solid var(--rule); vertical-align: top; font-size: .95rem; }
thead th { font-size: .66rem; letter-spacing: .13em; text-transform: uppercase; color: var(--ink-3); font-weight: 400; border-bottom-color: var(--rule-2); }
tbody th { font-weight: 400; color: var(--ink); padding-right: 26px; }
td.is-yes { color: var(--ink); }
td.is-no { color: var(--ink-3); }
td .mk { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; }
td .mk.y { color: var(--accent); }
/* The column being argued for is tinted, so the eye has somewhere to land in a
   table this wide. Tinting a row would say nothing. */
thead th:last-child, tbody td:last-child { background: var(--paper); padding-left: 16px; }
.tint thead th:last-child, .tint tbody td:last-child { background: var(--paper); }
thead th:last-child { color: var(--accent); }

/* ---------- the stamp ---------- */
.stamp {
  border: 2px solid var(--accent); padding: clamp(22px, 3vw, 32px) clamp(22px, 3.4vw, 38px);
  max-width: 46rem; position: relative;
}
.stamp::before {
  content: attr(data-stamp);
  position: absolute; top: -.72em; left: clamp(20px, 3vw, 30px); background: var(--paper);
  font-family: var(--mono); font-size: .66rem; letter-spacing: .2em; text-transform: uppercase;
  color: var(--accent); padding: 0 10px;
}
.tint .stamp::before { background: var(--paper-2); }
.stamp ol { margin: 0; padding: 0; list-style: none; counter-reset: s; }
.stamp li { counter-increment: s; padding: 11px 0; color: var(--ink-2); display: grid; grid-template-columns: 1.9rem 1fr; }
.stamp li::before { content: counter(s, decimal-leading-zero); font-family: var(--mono); font-size: .68rem; color: var(--accent); padding-top: .38em; }
.stamp li + li { border-top: 1px solid var(--rule); }
.stamp strong { color: var(--ink); }

/* ---------- download manifest ---------- */
.manifest { font-size: .74rem; line-height: 2.15; letter-spacing: .04em; color: var(--ink-3); margin: 0; }
.manifest b { color: var(--ink); font-weight: 400; }
.manifest span { display: inline-block; min-width: 8.5rem; color: var(--ink-3); }

/* ---------- prose ---------- */
.prose { max-width: var(--measure); }
.prose h2 { margin: 2.1em 0 .5em; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin: 1.9em 0 .4em; }
.prose p, .prose li { color: var(--ink-2); }
.prose strong { color: var(--ink); }
.prose ul, .prose ol { padding-left: 1.1em; margin: 0 0 1.2em; }
.prose li { margin-bottom: .5em; }
.prose li::marker { color: var(--accent); }
code { font-family: var(--mono); font-size: .84em; background: var(--paper-2); padding: 1px 5px; border: 1px solid var(--rule); }

/* ---------- questions ---------- */
.qa { border-top: 1px solid var(--rule); }
.qa > div { border-bottom: 1px solid var(--rule); padding: clamp(20px, 2.6vw, 28px) 0; display: grid; grid-template-columns: 3.4rem minmax(0, 1fr); gap: 0 clamp(14px, 2vw, 26px); }
.qa .n { font-family: var(--mono); font-size: .68rem; letter-spacing: .1em; color: var(--accent); padding-top: .5em; }
.qa h3 { margin-bottom: .45em; }
.qa p { color: var(--ink-2); margin: 0 0 .7em; max-width: 46rem; }
.qa p:last-child { margin-bottom: 0; }
@media (max-width: 620px) { .qa > div { grid-template-columns: 1fr; } .qa .n { padding: 0 0 8px; } }

/* ---------- before / after ---------- */
.ba { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
@media (max-width: 700px) { .ba { grid-template-columns: 1fr; } }
.ba > div { background: var(--paper); padding: clamp(18px, 2.6vw, 26px); }
.tint .ba > div { background: var(--paper-2); }
.ba h3 { font-family: var(--mono); font-size: .66rem; letter-spacing: .17em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 1.15em; }
.ba ul { list-style: none; margin: 0; padding: 0; font-family: var(--mono); font-size: .73rem; line-height: 2.1; letter-spacing: .02em; color: var(--ink-3); }
.ba .grp { color: var(--accent); letter-spacing: .14em; text-transform: uppercase; font-size: .64rem; padding-top: 1.1em; }
.ba .grp:first-child { padding-top: 0; }
.ba .it { color: var(--ink-2); padding-left: 1.1em; }

/* ---------- footer ---------- */
.site-foot { border-top: 1px solid var(--rule); padding: clamp(40px, 5vw, 62px) 0 clamp(46px, 6vw, 70px); background: var(--paper-2); }
.foot-cols { display: grid; grid-template-columns: minmax(0, 1.7fr) repeat(2, minmax(0, 1fr)); gap: clamp(24px, 4vw, 48px); padding-bottom: clamp(28px, 4vw, 42px); }
@media (max-width: 700px) { .foot-cols { grid-template-columns: 1fr 1fr; } .foot-cols > :first-child { grid-column: 1 / -1; } }
.site-foot h2 { font-family: var(--mono); font-size: .66rem; letter-spacing: .17em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 1.1em; font-weight: 400; }
.site-foot ul { list-style: none; margin: 0; padding: 0; }
.site-foot li { margin-bottom: .55em; font-size: .95rem; }
.site-foot .colophon { border-top: 1px solid var(--rule); padding-top: clamp(22px, 3vw, 30px); }
.site-foot .colophon p { color: var(--ink-3); font-size: .87rem; max-width: 62rem; }
.site-foot .colophon strong { color: var(--ink-2); font-weight: 400; }
.site-foot .set { font-family: var(--mono); font-size: .66rem; letter-spacing: .1em; color: var(--ink-3); text-transform: uppercase; }

.vh { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ── Contact form ─────────────────────────────────────────────────────────
   Two columns on a wide screen, one on a narrow one. Fields are set on the
   page rather than in a boxed card: the rest of the site is hairlines and
   margins, and a form is no reason to start drawing boxes. */
.cform{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(16px,2.4vw,26px);margin-top:clamp(22px,3vw,32px)}
.cform .frow{display:flex;flex-direction:column;gap:.45em;min-width:0}
.cform .frow.full{grid-column:1/-1}
.cform label{font:600 .78rem/1.3 var(--mono,ui-monospace,monospace);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3,#6b6455)}
.cform .opt{font-weight:400;text-transform:none;letter-spacing:0;opacity:.7}
.cform input,.cform select,.cform textarea{
  font:inherit;color:inherit;background:transparent;
  border:0;border-bottom:1px solid var(--rule,#d6cfbe);
  padding:.55em .1em;border-radius:0;width:100%;
}
.cform textarea{resize:vertical;min-height:8em;line-height:1.55}
.cform input:focus,.cform select:focus,.cform textarea:focus{outline:0;border-bottom-color:var(--accent,#c8452a);box-shadow:0 1px 0 0 var(--accent,#c8452a)}
.cform input::placeholder,.cform textarea::placeholder{color:var(--ink-3,#6b6455);opacity:.55}
.cform .actions{display:flex;flex-wrap:wrap;align-items:center;gap:clamp(14px,2vw,22px)}
@media (max-width:640px){.cform{grid-template-columns:1fr}}