/* ThinkTankPro — общая дизайн-система: главная, /brief/ и опросники.
   Бумага, чернила, сигнальный оранжевый. Режим «Чертёж» — html.is-blueprint. */
@font-face{font-family:"Inter";src:url("fonts/inter-400.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Inter";src:url("fonts/inter-600.woff2") format("woff2");font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"Roboto Mono";src:url("fonts/roboto-mono-400.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Roboto Mono";src:url("fonts/roboto-mono-700.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}

:root{
  --paper:#F1EFE8; --paper-hi:#F8F7F3; --paper-lo:#E6E3D9;
  --ink:#121211; --ink-2:#4A4842; --ink-3:#6F6C64;
  --rule:#D1CDC1; --rule-2:#E1DED4;
  --signal:#FF4F14; --signal-ink:#C23A08; --signal-soft:#FFE2D5;
  --blue:#2A55E5; --blue-soft:#DCE4FF;
  --green:#0F7A63; --green-soft:#D5ECE4;
  --dark:#121211; --dark-2:#1C1C1A; --on-dark:#EEECE5; --on-dark-2:#A9A69C; --rule-dark:rgba(238,236,229,.14);
  --grid-line:rgba(18,18,17,.055);
  --font-sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --font-mono:"Roboto Mono",ui-monospace,"SFMono-Regular",Consolas,monospace;
  --wrap:1440px; --gutter:clamp(16px,4vw,56px);
  --ease:cubic-bezier(.2,.7,.1,1); --ease-out:cubic-bezier(.16,1,.3,1); --ease-spring:cubic-bezier(.34,1.56,.64,1);
  --header-h:72px;
  color-scheme:light;
}
html.is-blueprint{
  --paper:#0E3C8F; --paper-hi:#11449D; --paper-lo:#0B3379;
  --ink:#EAF1FF; --ink-2:#C9D8F6; --ink-3:#9FB6E4;
  --rule:rgba(234,241,255,.38); --rule-2:rgba(234,241,255,.2);
  --signal:#FFC94D; --signal-ink:#FFD36E; --signal-soft:rgba(255,201,77,.16);
  --blue:#A8C6FF; --blue-soft:rgba(168,198,255,.16); --green:#86E8CB; --green-soft:rgba(134,232,203,.14);
  --dark:#0A2F74; --dark-2:#0C3682; --on-dark:#EAF1FF; --on-dark-2:#B9CBF0; --rule-dark:rgba(234,241,255,.22);
  --grid-line:rgba(234,241,255,.09);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:calc(var(--header-h) + 12px)}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-sans);font-size:17px;line-height:1.55;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;transition:background-color .5s var(--ease),color .5s var(--ease)}
html.is-blueprint body{background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);background-size:24px 24px}
img,svg,canvas,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:.18em}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
::selection{background:var(--signal);color:#fff}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px;border-radius:2px}
main:focus,[tabindex="-1"]:focus{outline:none}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

.skip{position:absolute;left:16px;top:-80px;z-index:200;padding:12px 16px;background:var(--ink);color:var(--paper);text-decoration:none;border-radius:8px;font-weight:600}
.skip:focus{top:12px}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.mono{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
.kicker{display:flex;align-items:center;gap:12px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2)}
.kicker::before{content:"";width:28px;height:1px;background:currentColor;opacity:.6}
.kicker b{font-weight:400;color:var(--signal-ink)}
.kicker--plain::before{display:none}

/* ---------- Шапка ---------- */
.hdr{position:sticky;top:0;z-index:100;height:var(--header-h);transition:background-color .3s,box-shadow .3s,border-color .3s;border-bottom:1px solid transparent}
.hdr.is-stuck{background:color-mix(in srgb,var(--paper) 82%,transparent);backdrop-filter:blur(14px) saturate(1.3);-webkit-backdrop-filter:blur(14px) saturate(1.3);border-bottom-color:var(--rule)}
.hdr-in{height:100%;display:flex;align-items:center;gap:28px}
.hdr.is-on-dark{--ink:#EEECE5;--ink-2:#C9C6BC;--ink-3:#A9A69C;--rule:rgba(238,236,229,.2);--paper:#121211;--paper-lo:#2A2A27;color:var(--ink);background:rgba(18,18,17,.82);border-bottom-color:rgba(238,236,229,.12)}
.hdr.is-on-dark .btn{--bg:#EEECE5;--fg:#121211}
.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;font-weight:600;font-size:19px;letter-spacing:-.02em;white-space:nowrap}
.brand-mark{position:relative;display:grid;place-items:center;width:36px;height:36px;border:1.5px solid currentColor;border-radius:3px;font-family:var(--font-mono);font-weight:700;font-size:13px;letter-spacing:-.02em;overflow:hidden}
.brand-mark::after{content:"";position:absolute;right:-1px;bottom:-1px;width:8px;height:8px;background:var(--signal)}
.brand small{font-weight:400;color:var(--ink-3)}
.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav a{position:relative;padding:8px 12px;text-decoration:none;font-size:15px;color:var(--ink-2);border-radius:999px;transition:color .2s,background-color .2s}
.nav a:hover{color:var(--ink);background:var(--paper-lo)}
.nav a[aria-current="page"]{color:var(--ink)}
.nav a[aria-current="page"]::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:1.5px;background:var(--signal)}
.hdr-tools{display:flex;align-items:center;gap:10px}
.bp-toggle{display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 14px 0 10px;border:1px solid var(--rule);border-radius:999px;background:transparent;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2);transition:border-color .2s,color .2s,background-color .2s}
.bp-toggle:hover{border-color:var(--ink);color:var(--ink)}
.bp-toggle svg{width:18px;height:18px}
.bp-toggle[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.menu-btn{display:none;width:44px;height:44px;border:1px solid var(--rule);border-radius:50%;background:transparent;place-items:center}
.menu-btn span{display:block;width:18px;height:1.5px;background:currentColor;box-shadow:0 -6px 0 currentColor,0 6px 0 currentColor;transition:transform .3s,box-shadow .3s}
.menu-btn[aria-expanded="true"] span{transform:rotate(45deg);box-shadow:0 0 0 currentColor,0 0 0 currentColor}

/* ---------- Кнопки ---------- */
.btn{--bg:var(--ink);--fg:var(--paper);position:relative;display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:52px;padding:0 26px;border:1px solid var(--bg);border-radius:999px;background:var(--bg);color:var(--fg);text-decoration:none;font-weight:600;font-size:16px;letter-spacing:-.01em;white-space:nowrap;overflow:hidden;isolation:isolate;transition:transform .35s var(--ease-out),background-color .25s,color .25s,border-color .25s}
.btn::before{content:"";position:absolute;inset:0;z-index:-1;background:var(--signal);transform:translateY(101%);transition:transform .45s var(--ease-out)}
.btn:hover::before,.btn:focus-visible::before{transform:none}
.btn:hover,.btn:focus-visible{color:#fff;border-color:var(--signal)}
.btn .arr{display:inline-block;transition:transform .35s var(--ease-out)}
.btn:hover .arr{transform:translateX(4px) rotate(-45deg)}
.btn--ghost{--bg:transparent;--fg:var(--ink);border-color:var(--ink)}
.btn--signal{--bg:var(--signal);--fg:#fff;border-color:var(--signal)}
.btn--signal::before{background:var(--ink)}
.btn--signal:hover{border-color:var(--ink)}
.btn--sm{min-height:42px;padding:0 18px;font-size:14.5px}
.link{display:inline-flex;align-items:center;gap:8px;font-weight:600;text-decoration:none;background:linear-gradient(currentColor,currentColor) 0 100%/100% 1px no-repeat;padding-bottom:3px;transition:background-size .4s var(--ease-out),color .2s}
.link:hover{color:var(--signal-ink);background-size:0 1px;background-position:100% 100%}

/* ---------- Секции ---------- */
.sec{position:relative;padding-block:clamp(88px,12vw,168px)}
.sec-head{display:grid;grid-template-columns:repeat(12,1fr);gap:24px;align-items:end;margin-bottom:clamp(40px,6vw,84px)}
.sec-head .kicker{grid-column:1/-1}
.sec-head h2{grid-column:1/span 8}
.sec-head p{grid-column:9/-1;color:var(--ink-2);font-size:17px;max-width:42ch}
.h-display{font-weight:600;font-size:clamp(52px,8.6vw,150px);line-height:.9;letter-spacing:-.055em}
.h-xl{font-weight:600;font-size:clamp(38px,5.6vw,88px);line-height:.95;letter-spacing:-.045em}
.h-l{font-weight:600;font-size:clamp(30px,3.6vw,54px);line-height:1;letter-spacing:-.035em}
.h-m{font-weight:600;font-size:clamp(22px,2vw,30px);line-height:1.12;letter-spacing:-.025em}
.lead{font-size:clamp(18px,1.5vw,21px);line-height:1.5;color:var(--ink-2);max-width:46ch}
.muted{color:var(--ink-2)}
.signal{color:var(--signal-ink)}
.outline-text{color:transparent;-webkit-text-stroke:1.5px var(--ink)}

.dark{background:var(--dark);color:var(--on-dark)}
.dark .kicker,.dark .muted,.dark .sec-head p{color:var(--on-dark-2)}
.dark .kicker b{color:var(--signal)}
.dark .btn{--bg:var(--on-dark);--fg:var(--dark)}
.dark .btn--ghost{--bg:transparent;--fg:var(--on-dark);border-color:var(--on-dark)}
.dark ::selection{background:var(--signal);color:#fff}

/* ---------- Появление ---------- */
[data-reveal]{opacity:0;transform:translateY(28px);transition:opacity .9s var(--ease-out),transform 1s var(--ease-out);transition-delay:var(--d,0s)}
[data-reveal].is-in{opacity:1;transform:none}
.split-line{display:block;overflow:hidden;padding-bottom:.16em;margin-bottom:-.16em}
.split-line>span{display:inline-block;transform:translateY(105%);transition:transform 1.1s var(--ease-out);transition-delay:var(--d,0s)}
[data-split].is-in .split-line>span{transform:none}
.no-js [data-reveal],.no-js .split-line>span{opacity:1;transform:none}

/* ---------- Бегущая строка ---------- */
.ticker{position:relative;overflow:hidden;border-block:1px solid var(--rule);padding-block:18px;background:var(--paper)}
.ticker-track{display:flex;width:max-content;animation:ticker 60s linear infinite}
.ticker:hover .ticker-track{animation-play-state:paused}
.ticker-track span{display:inline-flex;align-items:center;gap:28px;padding-right:28px;font-size:clamp(20px,2.2vw,30px);font-weight:600;letter-spacing:-.03em;white-space:nowrap}
.ticker-track span::after{content:"";width:10px;height:10px;background:var(--signal);transform:rotate(45deg)}
.ticker-track span:nth-child(3n+2){color:transparent;-webkit-text-stroke:1px var(--ink)}
@keyframes ticker{to{transform:translateX(-50%)}}

/* ---------- Образцы-бирки (опыт) ---------- */
.tags{position:relative;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));column-gap:18px;row-gap:64px;align-items:start;padding-top:8px}
.tags-hint{margin:0 0 18px;font-size:11px;color:var(--ink-3)}
/* Каждая бирка висит на своём отрезке общей нити; длина нити у соседних бирок разная */
.tag-slot{--string:44px;position:relative;padding-top:var(--string)}
.tag-slot:nth-child(even){--string:66px}
.tag-slot::before{content:"";position:absolute;left:-9px;right:-9px;top:0;height:1px;background:var(--ink);opacity:.5}
.tag-slot:first-child::before{left:-3%}
.tag-slot:last-child::before{right:-3%}
.tag{--rot:0deg;position:relative;padding:38px 20px 22px;background:var(--paper-hi);border:1px solid var(--rule);border-radius:4px 4px 18px 18px;transform-origin:50% calc(-1 * var(--string));transform:rotate(var(--rot));transition:opacity .9s var(--ease-out) var(--d,0s),translate 1s var(--ease-out) var(--d,0s),transform .9s var(--ease-spring),box-shadow .3s;box-shadow:0 1px 0 rgba(18,18,17,.04),0 18px 30px -24px rgba(18,18,17,.35);cursor:pointer}
.tags .tag[data-reveal]{transform:rotate(var(--rot))}
.tags .tag[data-reveal]:not(.is-in){translate:0 28px}
.tag::before{content:"";position:absolute;left:50%;top:calc(-1 * var(--string));width:1px;height:calc(var(--string) + 21px);background:var(--ink);opacity:.5}
.tag.is-pinned{transition:opacity .9s var(--ease-out),translate 1s var(--ease-out),transform .9s var(--ease-spring),box-shadow .3s,rotate .7s var(--ease-spring)}
.tag-pin{position:absolute;left:50%;top:10px;z-index:2;width:24px;height:24px;margin-left:-12px;padding:0;border:0;border-radius:50%;background:none;cursor:pointer}
.tag-pin::before{content:"";position:absolute;inset:5px;border-radius:50%;border:1.5px solid var(--ink);background:var(--paper);transition:opacity .2s}
.tag-pin::after{content:"";position:absolute;inset:0;border-radius:50%;background:radial-gradient(circle at 34% 30%,#fff 0 9%,var(--pin,#FF4F14) 34%,color-mix(in srgb,var(--pin,#FF4F14) 62%,#000) 100%);box-shadow:0 2px 0 rgba(0,0,0,.2),0 9px 16px -5px rgba(0,0,0,.45);opacity:0;transform:translateY(-34px) scale(1.5);transition:transform .55s var(--ease-spring),opacity .18s}
.tag.is-pinned .tag-pin::after{opacity:1;transform:none}
.tag.is-pinned .tag-pin::before{opacity:0}
.tag-pin:focus-visible{outline:2px solid var(--signal);outline-offset:3px}
.tag-code{display:flex;justify-content:space-between;gap:8px;margin-top:12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3)}
.tag-code b{font-weight:400;color:var(--signal-ink)}
.tag h3{margin:18px 0 10px;font-size:20px;line-height:1.15;letter-spacing:-.02em}
.tag p{font-size:14.5px;line-height:1.5;color:var(--ink-2)}
.tag dl{margin-top:16px;padding-top:12px;border-top:1px dashed var(--rule);display:grid;gap:4px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.03em;color:var(--ink-2)}
.tag dl div{display:flex;justify-content:space-between;gap:10px}
.tag dt{color:var(--ink-3)}
.tag dd{text-align:right}
.tag-log{display:grid;gap:9px;margin-top:4px}
.tag-log li{display:grid;gap:1px;font-size:13.5px;line-height:1.4;color:var(--ink-2)}
.tag-log b{font:400 11px/1.6 var(--font-mono);letter-spacing:.03em;color:var(--signal-ink)}
.task-chips{display:flex;flex-wrap:wrap;gap:6px;margin:2px 0 4px}
.task-chips a{display:inline-flex;align-items:center;min-height:34px;padding:6px 12px;border:1px solid var(--rule);border-radius:999px;background:var(--paper);font-size:13.5px;line-height:1.25;color:var(--ink);text-decoration:none;transition:border-color .2s,color .2s,transform .2s var(--ease-out),background-color .2s}
.task-chips a:hover,.task-chips a:focus-visible{border-color:var(--signal);color:var(--signal-ink);background:var(--paper-hi);transform:translateY(-1px)}
.task-chips a.is-own{border-style:dashed;color:var(--ink-2)}
@media (hover:hover){.tag:not(.is-pinned):hover{--rot:-1.5deg;box-shadow:0 1px 0 rgba(18,18,17,.04),0 26px 40px -22px rgba(18,18,17,.4)}}

/* ---------- Подвал ---------- */
.ftr{position:relative;padding-top:clamp(72px,9vw,120px);padding-bottom:28px;background:var(--dark);color:var(--on-dark);overflow:hidden}
.ftr a{color:var(--on-dark);text-decoration:none}
.ftr a:hover{color:var(--signal)}
.ftr-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:32px;padding-bottom:56px;border-bottom:1px solid var(--rule-dark)}
.ftr-grid h3{font-family:var(--font-mono);font-weight:400;font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--on-dark-2);margin-bottom:16px}
.ftr-grid li+li{margin-top:8px}
.ftr-claim{font-size:clamp(24px,2.4vw,34px);font-weight:600;line-height:1.1;letter-spacing:-.03em;max-width:18ch}
.ftr-word{display:block;margin:40px 0 0;font-weight:600;font-size:clamp(64px,15.4vw,236px);line-height:.8;letter-spacing:-.065em;color:transparent;-webkit-text-stroke:1px rgba(238,236,229,.32);white-space:nowrap;user-select:none}
.ftr-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 24px;margin-top:28px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:var(--on-dark-2)}
.ftr .bp-toggle{border-color:var(--rule-dark);color:var(--on-dark-2)}
.ftr .bp-toggle:hover{border-color:var(--on-dark);color:var(--on-dark)}
.ftr .bp-toggle[aria-pressed="true"]{background:var(--on-dark);color:var(--dark)}

/* ---------- Режим «Чертёж» ---------- */
.bp-grid{position:fixed;inset:0;z-index:90;pointer-events:none;opacity:0;transition:opacity .5s;display:grid;grid-template-columns:repeat(12,1fr);gap:24px;padding-inline:var(--gutter);max-width:var(--wrap);margin-inline:auto}
.bp-grid i{border-inline:1px solid rgba(234,241,255,.16);background:rgba(234,241,255,.025)}
html.is-blueprint .bp-grid{opacity:1}
.bp-tag{position:absolute;left:8px;top:8px;z-index:95;padding:3px 8px;border:1px solid rgba(234,241,255,.6);background:#0E3C8F;color:#EAF1FF;font:400 10.5px/1.2 var(--font-mono);letter-spacing:.06em;text-transform:uppercase;pointer-events:none;white-space:nowrap}
html:not(.is-blueprint) .bp-tag{display:none}
html.is-blueprint [data-bp]{outline:1px dashed rgba(234,241,255,.45);outline-offset:-1px}
html.is-blueprint .dark,html.is-blueprint .ftr{background:transparent}
html.is-blueprint .btn{--bg:transparent;--fg:var(--ink);border-color:var(--ink)}
html.is-blueprint .tag,html.is-blueprint .card-surface{background:transparent;box-shadow:none}
.bp-scan{position:fixed;left:0;right:0;top:0;height:2px;z-index:300;background:linear-gradient(90deg,transparent,#FFC94D,transparent);box-shadow:0 0 24px 6px rgba(255,201,77,.35);pointer-events:none;transform:translateY(-10px)}
.bp-scan.run{animation:scan .75s var(--ease) forwards}
@keyframes scan{to{transform:translateY(100vh)}}

/* ---------- Мобильное меню ---------- */
.mnav{position:fixed;inset:0;z-index:150;display:flex;flex-direction:column;justify-content:space-between;padding:calc(var(--header-h) + 24px) var(--gutter) 32px;background:var(--ink);color:var(--paper);clip-path:circle(0 at calc(100% - 38px) 36px);transition:clip-path .6s var(--ease-out);visibility:hidden}
.mnav.is-open{clip-path:circle(150% at calc(100% - 38px) 36px);visibility:visible}
.mnav a{display:block;padding:10px 0;font-size:clamp(34px,9vw,52px);font-weight:600;letter-spacing:-.04em;line-height:1.05;text-decoration:none;border-bottom:1px solid rgba(255,255,255,.12)}
.mnav a small{display:block;font:400 11px/1.4 var(--font-mono);letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.5)}
.mnav-foot{font-family:var(--font-mono);font-size:12px;color:rgba(255,255,255,.55)}
html.menu-open{overflow:hidden}

@media (max-width:1100px){
  .nav{display:none}
  .menu-btn{display:grid}
  .hdr-in{gap:12px}
  .hdr-tools{margin-left:auto}
  .tags{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:860px){
  .sec-head{grid-template-columns:1fr}
  .sec-head h2,.sec-head p{grid-column:1/-1}
  .ftr-grid{grid-template-columns:1fr 1fr}
  .ftr-grid>div:first-child{grid-column:1/-1}
  .tags{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:620px){
  :root{--header-h:64px}
  body{font-size:16px}
  .hdr .btn--sm{display:none}
  .hdr .bp-toggle .bp-label{display:none}
  .hdr .bp-toggle{padding:0;width:40px;justify-content:center}
  .tags{grid-template-columns:1fr;row-gap:36px}
  .tag-slot,.tag-slot:nth-child(even){--string:34px}
  .tag-slot::before{left:30%;right:30%}
  .ftr-grid{grid-template-columns:1fr}
  .btn{min-height:50px;padding:0 22px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  [data-reveal],.split-line>span{opacity:1!important;transform:none!important}
  .ticker-track{animation:none;flex-wrap:wrap;width:auto}
  .ticker-track span[aria-hidden="true"]{display:none}
}