/* КК-Замер — kk-measure.ru */

@font-face { font-family: "Fira Sans Extra Condensed"; font-weight: 600; font-display: swap;
  src: url(../fonts/fsec-600-cyr.woff2) format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "Fira Sans Extra Condensed"; font-weight: 600; font-display: swap;
  src: url(../fonts/fsec-600-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Fira Sans Extra Condensed"; font-weight: 600; font-display: swap;
  src: url(../fonts/fsec-600-rub.woff2) format("woff2"); unicode-range: U+20BD; }

@font-face { font-family: "IBM Plex Sans"; font-weight: 400; font-display: swap;
  src: url(../fonts/plex-400-cyr.woff2) format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "IBM Plex Sans"; font-weight: 400; font-display: swap;
  src: url(../fonts/plex-400-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "IBM Plex Sans"; font-weight: 400; font-display: swap;
  src: url(../fonts/plex-400-rub.woff2) format("woff2"); unicode-range: U+20BD; }
@font-face { font-family: "IBM Plex Sans"; font-weight: 600; font-display: swap;
  src: url(../fonts/plex-600-cyr.woff2) format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "IBM Plex Sans"; font-weight: 600; font-display: swap;
  src: url(../fonts/plex-600-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "IBM Plex Sans"; font-weight: 600; font-display: swap;
  src: url(../fonts/plex-600-rub.woff2) format("woff2"); unicode-range: U+20BD; }

@font-face { font-family: "IBM Plex Mono"; font-weight: 500; font-display: swap;
  src: url(../fonts/plexmono-500-cyr.woff2) format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "IBM Plex Mono"; font-weight: 500; font-display: swap;
  src: url(../fonts/plexmono-500-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "IBM Plex Mono"; font-weight: 500; font-display: swap;
  src: url(../fonts/plexmono-500-rub.woff2) format("woff2"); unicode-range: U+20BD; }

:root {
  --paper: #F3F5F4;      /* калька */
  --sheet: #FFFFFF;
  --ink: #1B2127;        /* графит */
  --ink-2: #4F5962;
  --rule: #CBD4D7;
  --rule-strong: #1B2127;
  --blue: #1F4F8A;       /* синька: дорисованные линии в .b3d */
  --blue-ink: #163B69;
  --blue-wash: #E6EDF5;
  --night: #0F2742;      /* поле чертежа */
  --night-2: #1A3A60;
  --laser: #E8261C;
  --ok: #2E7D4F;

  --f-display: "Fira Sans Extra Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --f-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;

  --wrap: 1200px;
  --gut: clamp(16px, 4vw, 40px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 17px/1.55 var(--f-body);
  font-kerning: normal; text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: var(--blue); text-underline-offset: 3px; }
a:hover { color: var(--blue-ink); }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 4px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 100; background: var(--sheet); padding: 8px 12px; }

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

h1, h2, h3 { font-family: var(--f-display); font-weight: 600; margin: 0; letter-spacing: -0.005em; }
h1 { font-size: clamp(46px, 7vw, 92px); line-height: 0.96; }
h2 { font-size: clamp(34px, 4.6vw, 58px); line-height: 1.0; }
h3 { font-size: 25px; line-height: 1.1; }
p { margin: 0 0 1em; }
.lead { font-size: clamp(17px, 1.6vw, 20px); line-height: 1.55; color: var(--ink-2); max-width: 62ch; }
.num { font-variant-numeric: tabular-nums; }
.nowrap { white-space: nowrap; }

/* ---------- кнопки ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 0 24px; border-radius: 10px;
  font: 600 17px/1 var(--f-body); text-decoration: none; cursor: pointer;
  border: 2px solid var(--blue); background: var(--blue); color: #fff;
  transition: background-color .15s, border-color .15s, color .15s;
}
.btn:hover { background: var(--blue-ink); border-color: var(--blue-ink); color: #fff; }
.btn.ghost { background: transparent; color: var(--blue); }
.btn.ghost:hover { background: var(--blue-wash); color: var(--blue-ink); }
.btn.small { min-height: 42px; padding: 0 16px; font-size: 15px; }

/* ---------- шапка ---------- */
.top {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid transparent; transition: border-color .2s;
}
.top.scrolled { border-bottom-color: var(--rule); }
.top .wrap { display: flex; align-items: center; gap: 24px; min-height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); margin-right: auto; }
.logo svg { width: 30px; height: 30px; }
.logo b { font: 600 25px/1 var(--f-display); letter-spacing: 0; }
.nav { display: flex; gap: 22px; }
.nav a { color: var(--ink); text-decoration: none; font-size: 15px; }
.nav a:hover { color: var(--blue); text-decoration: underline; }
@media (max-width: 900px) { .nav { display: none; } }

/* ---------- первый экран ---------- */
.hero { padding: clamp(28px, 5vw, 64px) 0 clamp(48px, 7vw, 96px); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(28px, 4vw, 56px); align-items: center; }
@media (max-width: 960px) { .hero .wrap { grid-template-columns: 1fr; } }
.hero h1 { margin-bottom: 14px; }
/* размерная линия под заголовком — как на чертеже */
.dimline { display: flex; align-items: center; gap: 10px; margin: 0 0 26px; color: var(--blue); font: 500 14px/1 var(--f-mono); }
.dimline::before, .dimline::after { content: ""; flex: 1; height: 12px;
  background: linear-gradient(var(--blue), var(--blue)) left center / 100% 1.5px no-repeat; }
.dimline::before { border-left: 1.5px solid var(--blue); }
.dimline::after { border-right: 1.5px solid var(--blue); }
.hero .lead { margin-bottom: 28px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.facts { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 26px 0 0; padding: 0; list-style: none; color: var(--ink-2); font-size: 15px; }
.facts li { display: flex; align-items: center; gap: 8px; }
.facts li::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--laser); box-shadow: 0 0 0 3px #f6d2cf; }

/* поле чертежа (синька) */
.board {
  position: relative; background: var(--night); border-radius: 18px; overflow: hidden; color: #DCE7F3;
  box-shadow: 0 1px 0 #fff inset, 0 30px 60px -30px rgba(15, 39, 66, .55);
}
.board canvas { width: 100%; height: 100%; touch-action: none; cursor: grab; }
.board canvas:active { cursor: grabbing; }
.hero .board { width: 100%; aspect-ratio: 7 / 5.6; }
@media (max-width: 600px) { .hero .board { aspect-ratio: 1 / 1.08; } }
.board-cap { position: absolute; left: 18px; top: 14px; right: 18px; display: flex; justify-content: space-between; gap: 12px;
  font-size: 13px; color: #9FB7D2; pointer-events: none; }
.readout {
  position: absolute; left: 14px; right: 14px; bottom: 14px; display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: baseline;
  padding: 10px 14px; border-radius: 10px; background: rgba(8, 24, 43, .82); border: 1px solid #284a73;
  font: 500 14px/1.3 var(--f-mono); color: #E9F1F9; font-variant-numeric: tabular-nums; pointer-events: none;
}
.readout .rk { color: #7F9CBD; margin-right: 6px; }
.readout .pt { color: #FF8A82; }
.stamp-ok { position: absolute; right: 18px; top: 40px; padding: 8px 12px; border: 2px solid #7DD3A2; color: #A9E8C3; border-radius: 8px;
  font: 600 18px/1 var(--f-display); transform: rotate(-4deg); opacity: 0; transition: opacity .3s; pointer-events: none; }
.stamp-ok.show { opacity: 1; }

/* ---------- секции ---------- */
section { scroll-margin-top: 72px; }
.sec { padding: clamp(56px, 8vw, 112px) 0; }
.sec.sheet { background: var(--sheet); }
.sec-head { max-width: 760px; margin-bottom: clamp(28px, 4vw, 48px); }
.sec-head h2 { margin-bottom: 16px; }

/* шаги по линейке */
.ruler { position: relative; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0 22px; padding-top: 46px; margin: 0; list-style: none; }
.ruler::before { /* шкала */
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 26px;
  background-image:
    linear-gradient(var(--ink), var(--ink)),
    linear-gradient(90deg, var(--ink) 0 1.5px, transparent 1.5px),
    linear-gradient(90deg, var(--ink) 0 1.5px, transparent 1.5px);
  background-size: 100% 2px, 2% 9px, 20% 20px;
  background-position: left bottom, left bottom, left bottom;
  background-repeat: no-repeat, repeat-x, repeat-x;
}
.ruler li { position: relative; padding-right: 6px; }
.ruler .n { position: absolute; top: -48px; left: 0; font: 600 18px/1 var(--f-display); background: var(--paper); padding: 0 6px 0 0; }
.ruler h3 { margin: 6px 0 8px; font-size: 23px; }
.ruler p { color: var(--ink-2); font-size: 16px; }
@media (max-width: 900px) {
  .ruler { grid-template-columns: 1fr; padding: 0 0 0 44px; gap: 26px; }
  .ruler::before { left: 0; top: 0; bottom: 0; right: auto; width: 26px; height: auto;
    background-image:
      linear-gradient(var(--ink), var(--ink)),
      linear-gradient(180deg, var(--ink) 0 1.5px, transparent 1.5px);
    background-size: 2px 100%, 10px 24px;
    background-position: left top, left top;
    background-repeat: no-repeat, repeat-y; }
  .ruler .n { position: static; display: inline-block; background: none; color: var(--blue); }
}

/* демо: телефон */
.demo { display: grid; grid-template-columns: minmax(0, 380px) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
@media (max-width: 860px) { .demo { grid-template-columns: 1fr; } .phone { margin: 0 auto; } }
.phone {
  width: 100%; max-width: 380px; background: #12171C; border-radius: 42px; padding: 12px;
  box-shadow: 0 0 0 1.5px #3a434c inset, 0 40px 80px -40px rgba(20, 30, 40, .6);
}
.screen { position: relative; border-radius: 32px; overflow: hidden; background: #F7F9FA; display: flex; flex-direction: column; height: 720px; max-height: 82vh; min-height: 600px; }
.sbar { height: 30px; display: flex; align-items: center; justify-content: space-between; padding: 0 22px; font: 600 12px/1 var(--f-body); color: #2a2f35; flex: none; }
.scanvas { position: relative; flex: 1 1 auto; min-height: 250px; background: var(--night); }
.scanvas canvas { width: 100%; height: 100%; touch-action: none; }
.chips { position: absolute; left: 8px; top: 8px; right: 8px; display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  border: 1px solid #2E5684; background: rgba(15, 39, 66, .85); color: #CFE0F2; border-radius: 8px;
  font: 500 12px/1 var(--f-body); padding: 7px 9px; cursor: pointer; min-height: 30px;
}
.chip[aria-pressed="true"] { background: #DCE8F6; color: var(--night); border-color: #DCE8F6; }
.sstatus { position: absolute; left: 10px; bottom: 8px; right: 10px; font: 500 12px/1.3 var(--f-body); color: #A7BFD9; display: flex; justify-content: space-between; gap: 8px; pointer-events: none; }
.sstatus .saved { color: #9FE0B9; }
.spanel { flex: none; padding: 10px 12px 8px; display: flex; flex-direction: column; gap: 8px; background: #F7F9FA; border-top: 1px solid #DDE3E7; }
.hint { font-size: 13px; line-height: 1.35; color: #3D4750; height: 53px; overflow: hidden; }
.hint b { color: var(--ink); }
.srow { display: flex; gap: 8px; }
.srow > * { flex: 1; }
.sbtn {
  min-height: 42px; border-radius: 10px; border: 1.5px solid #B9C6D2; background: #fff; color: var(--ink);
  font: 600 14px/1.1 var(--f-body); cursor: pointer; padding: 0 8px;
}
.sbtn:disabled { opacity: .45; cursor: default; }
.sbtn.primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.sbtn.on { background: #FDECEB; border-color: var(--laser); color: #9F1610; }
.seg { display: flex; border: 1.5px solid #B9C6D2; border-radius: 10px; overflow: hidden; }
.seg button { flex: 1; border: 0; background: #fff; font: 600 13px/1 var(--f-body); cursor: pointer; min-height: 38px; color: var(--ink-2); }
.seg button[aria-pressed="true"] { background: var(--blue-wash); color: var(--blue-ink); }
.sel { height: 53px; white-space: pre-line; font: 500 12.5px/1.35 var(--f-mono); color: var(--ink); background: #EAF0F6; border-radius: 8px; padding: 6px 8px; font-variant-numeric: tabular-nums; }
.tabs { flex: none; display: flex; justify-content: space-around; border-top: 1px solid #DDE3E7; padding: 6px 0 10px; background: #EFF3F6; }
.tabs span { font: 500 11px/1.2 var(--f-body); color: #6A757F; text-align: center; }
.tabs span b { display: block; font-size: 15px; font-weight: 400; }
.tabs span.cur { color: var(--blue); }
.sheet-over { position: absolute; inset: auto 0 0 0; background: #fff; border-radius: 20px 20px 0 0; padding: 18px 18px 22px;
  box-shadow: 0 -20px 40px rgba(0, 0, 0, .18); transform: translateY(105%); transition: transform .28s ease; z-index: 3; }
.sheet-over.open { transform: none; }
@media (prefers-reduced-motion: reduce) { .sheet-over { transition: none; } }
.sheet-over h3 { font-size: 22px; margin-bottom: 8px; }
.tree { margin: 10px 0 14px; padding: 0; list-style: none; font: 500 13px/1.6 var(--f-mono); color: var(--ink); }
.tree ul { margin: 0; padding-left: 18px; list-style: none; border-left: 1px solid var(--rule); }
.tree li { padding-left: 2px; }
.okmsg { color: var(--ok); font-weight: 600; font-size: 14px; margin-bottom: 12px; }

.demo-side h2 { margin-bottom: 16px; }
.try { margin: 22px 0 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.try li { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; }
.try li i { font-style: normal; width: 34px; height: 34px; border-radius: 50%; border: 1.5px solid var(--blue); color: var(--blue);
  display: grid; place-items: center; font: 600 17px/1 var(--f-display); }
.note { font-size: 14px; color: var(--ink-2); margin-top: 22px; }

/* возможности — штамп чертежа */
.spec { border: 2px solid var(--rule-strong); background: var(--sheet); }
.spec-row { display: grid; grid-template-columns: minmax(180px, 260px) 1fr; border-top: 1px solid var(--rule); }
.spec-row:first-child { border-top: 0; }
.spec-row > h3 { padding: 22px 22px; border-right: 1px solid var(--rule); font-size: 26px; }
.spec-row ul { margin: 0; padding: 18px 22px 18px 22px; list-style: none; columns: 2 280px; column-gap: 36px; }
.spec-row li { break-inside: avoid; padding: 6px 0 6px 20px; position: relative; }
.spec-row li::before { content: ""; position: absolute; left: 0; top: 15px; width: 9px; height: 1.5px; background: var(--blue); }
@media (max-width: 700px) { .spec-row { grid-template-columns: 1fr; } .spec-row > h3 { border-right: 0; border-bottom: 1px solid var(--rule); padding-bottom: 14px; } }

/* экспорт */
.flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center; gap: 14px; margin-bottom: 40px; }
.flow .node { border: 1.5px solid var(--ink); border-radius: 12px; padding: 16px 18px; background: var(--sheet); min-height: 104px; }
.flow .node b { display: block; font: 600 24px/1.1 var(--f-display); margin-bottom: 4px; }
.flow .node span { color: var(--ink-2); font-size: 15px; }
.flow .node.file { border-color: var(--blue); background: var(--blue-wash); }
.flow .arrow { width: 44px; height: 2px; background: var(--ink); position: relative; }
.flow .arrow::after { content: ""; position: absolute; right: -1px; top: -5px; border: 6px solid transparent; border-left: 9px solid var(--ink); border-right: 0; }
@media (max-width: 760px) {
  .flow { grid-template-columns: 1fr; }
  .flow .arrow { width: 2px; height: 28px; margin-left: 28px; }
  .flow .arrow::after { right: auto; left: -5px; top: auto; bottom: -1px; border: 6px solid transparent; border-top: 9px solid var(--ink); border-bottom: 0; }
}
.formats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(24px, 4vw, 56px); }
@media (max-width: 760px) { .formats { grid-template-columns: 1fr; } }
.formats h3 { font-size: 30px; margin-bottom: 12px; }
.formats ul { margin: 0; padding-left: 20px; }
.formats li { margin: 6px 0; }
.axes { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0 8px; }
.axes code { font: 500 14px/1 var(--f-mono); background: var(--blue-wash); color: var(--blue-ink); padding: 8px 10px; border-radius: 8px; }

/* окупаемость */
.calc { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(24px, 4vw, 56px); align-items: start; }
@media (max-width: 860px) { .calc { grid-template-columns: 1fr; } }
.field { margin-bottom: 26px; }
.field label { display: flex; justify-content: space-between; gap: 12px; font-weight: 600; margin-bottom: 10px; }
.field output { font: 600 22px/1 var(--f-display); color: var(--blue); font-variant-numeric: tabular-nums; }
input[type="range"] { width: 100%; accent-color: var(--blue); height: 28px; }
.result { border-left: 3px solid var(--blue); padding: 6px 0 6px 22px; }
.result .big { font: 600 clamp(40px, 5vw, 64px)/1 var(--f-display); margin: 6px 0 12px; font-variant-numeric: tabular-nums; }
.result p { color: var(--ink-2); }

/* цена — основная надпись чертежа */
.stampbox { border: 2px solid var(--rule-strong); background: var(--sheet); display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); }
@media (max-width: 860px) { .stampbox { grid-template-columns: 1fr; } }
.stampbox .cells { display: grid; grid-template-columns: minmax(120px, 170px) 1fr; border-right: 1px solid var(--rule); }
@media (max-width: 860px) { .stampbox .cells { border-right: 0; border-bottom: 1px solid var(--rule); } }
.stampbox .k, .stampbox .v { padding: 14px 18px; border-top: 1px solid var(--rule); }
.stampbox .k { color: var(--ink-2); font-size: 14px; border-right: 1px solid var(--rule); }
.stampbox .k:nth-child(1), .stampbox .v:nth-child(2) { border-top: 0; }
.stampbox .v { font-weight: 600; }
.pricecol { padding: clamp(22px, 3vw, 36px); display: flex; flex-direction: column; gap: 16px; }
.price { font: 600 clamp(64px, 8vw, 104px)/0.9 var(--f-display); letter-spacing: -0.01em; font-variant-numeric: tabular-nums; }
.price small { font-size: .42em; color: var(--ink-2); letter-spacing: 0; }
.incl { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.incl li { padding-left: 24px; position: relative; }
.incl li::before { content: ""; position: absolute; left: 2px; top: 7px; width: 10px; height: 6px; border-left: 2px solid var(--ok); border-bottom: 2px solid var(--ok); transform: rotate(-45deg); }
.buyinfo { font-size: 15px; color: var(--ink-2); }
.buyinfo:empty { display: none; }

/* вопросы */
.faq { max-width: 860px; }
.faq details { border-top: 1px solid var(--rule); }
.faq details:last-child { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; list-style: none; padding: 20px 44px 20px 0; position: relative; font: 600 24px/1.15 var(--f-display); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 8px; top: 26px; width: 12px; height: 12px; border-right: 2px solid var(--blue); border-bottom: 2px solid var(--blue); transform: rotate(45deg); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(-135deg); top: 32px; }
.faq details > div { padding: 0 0 20px; color: var(--ink-2); max-width: 70ch; }

/* финальный призыв */
.final { background: var(--night); color: #E5EEF8; }
.final .wrap { display: flex; flex-wrap: wrap; gap: 24px 48px; align-items: center; justify-content: space-between; }
.final h2 { max-width: 16ch; }
.final p { color: #A9C0D9; max-width: 52ch; }
.final .btn { background: #fff; border-color: #fff; color: var(--night); }
.final .btn:hover { background: #DCE8F6; border-color: #DCE8F6; }

footer { padding: 36px 0 48px; color: var(--ink-2); font-size: 14px; }
footer .wrap { display: grid; gap: 10px; }
footer .seller:empty { display: none; }

@media (max-width: 520px) {
  body { font-size: 16px; }
  .btn { width: 100%; }
  .top .btn { width: auto; }
  .screen { height: 680px; }
}