/* ============================================================
   AVatar Сайты — Направление B «Тёмный зал»
   ДНК 04-holodnyy-dark · Lora + Onest · section-narrative
   ============================================================ */

/* ---------- Шрифты (self-hosted, кириллица + латиница раздельно) ---------- */
@font-face{font-family:'Lora';font-style:normal;font-weight:500;font-display:swap;
  src:url('fonts/lora-cyrillic-500.woff2') format('woff2');
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:'Lora';font-style:normal;font-weight:500;font-display:swap;
  src:url('fonts/lora-latin-500.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;}
@font-face{font-family:'Lora';font-style:normal;font-weight:600;font-display:swap;
  src:url('fonts/lora-cyrillic-600.woff2') format('woff2');
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:'Lora';font-style:normal;font-weight:600;font-display:swap;
  src:url('fonts/lora-latin-600.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;}
@font-face{font-family:'Lora';font-style:normal;font-weight:700;font-display:swap;
  src:url('fonts/lora-cyrillic-700.woff2') format('woff2');
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:'Lora';font-style:normal;font-weight:700;font-display:swap;
  src:url('fonts/lora-latin-700.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;}

@font-face{font-family:'Onest';font-style:normal;font-weight:400;font-display:swap;
  src:url('fonts/onest-cyrillic-400.woff2') format('woff2');
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:'Onest';font-style:normal;font-weight:400;font-display:swap;
  src:url('fonts/onest-latin-400.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;}
@font-face{font-family:'Onest';font-style:normal;font-weight:500;font-display:swap;
  src:url('fonts/onest-cyrillic-500.woff2') format('woff2');
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:'Onest';font-style:normal;font-weight:500;font-display:swap;
  src:url('fonts/onest-latin-500.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;}
@font-face{font-family:'Onest';font-style:normal;font-weight:600;font-display:swap;
  src:url('fonts/onest-cyrillic-600.woff2') format('woff2');
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:'Onest';font-style:normal;font-weight:600;font-display:swap;
  src:url('fonts/onest-latin-600.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;}
@font-face{font-family:'Onest';font-style:normal;font-weight:700;font-display:swap;
  src:url('fonts/onest-cyrillic-700.woff2') format('woff2');
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:'Onest';font-style:normal;font-weight:700;font-display:swap;
  src:url('fonts/onest-latin-700.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;}

/* ---------- Токены ---------- */
:root{
  /* палитра (все холодные) */
  --ink:#0E1116;
  --panel:#161B22;
  --text:#E8ECF1;
  --muted:#96A2B2;
  --steel:#68A6C4;
  --paper:#EDF0F4;
  --slate:#4C5866;
  --steel-deep:#2E6E8E;

  /* производные линии/свет (холодные, не чёрные) */
  --hairline:rgba(150,162,178,0.16);
  --hairline-paper:rgba(76,88,102,0.20);
  --steel-glow:rgba(104,166,196,0.16);

  /* типографика */
  --display:'Lora',Georgia,'Times New Roman',serif;
  --body:'Onest',system-ui,-apple-system,'Segoe UI',sans-serif;

  /* шкала ×1.25, база 18px */
  --fs-xs:0.75rem;      /* 13.5px — служебные лейблы */
  --fs-sm:0.9375rem;    /* 15px  — мелкий UI */
  --fs-body:1.125rem;   /* 18px  — основной текст */
  --fs-lead:1.375rem;   /* 22px  — лид */
  --fs-h3:1.75rem;      /* 28px  */
  --fs-h2:clamp(2rem,3.4vw,2.75rem);
  --fs-h1:clamp(2.75rem,7vw,5rem);
  --fs-num:clamp(2.25rem,5vw,3.5rem);

  /* радиусы (единая шкала: sm/base/lg/full) */
  --r-sm:10px;
  --r:18px;
  --r-lg:28px;

  /* тени — холодные, двухуровневые, НЕ чёрные */
  --shadow-dark:0 1px 2px rgba(6,10,16,0.5), 0 22px 44px -18px rgba(4,10,20,0.72);
  --shadow-paper:0 1px 2px rgba(46,58,74,0.10), 0 20px 40px -20px rgba(38,52,70,0.28);

  --ease:cubic-bezier(.22,.61,.36,1);
  --maxw:1200px;
}

/* ---------- База ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{font-size:100%;scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;background:var(--ink);color:var(--text);
  font-family:var(--body);font-size:var(--fs-body);font-weight:400;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
::selection{background:var(--steel);color:var(--ink);}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3{margin:0;font-family:var(--display);font-weight:600;line-height:1.1;letter-spacing:-0.015em;}
p{margin:0;}

:focus-visible{outline:2px solid var(--steel);outline-offset:3px;border-radius:4px;}
.paper :focus-visible{outline-color:var(--steel-deep);}

.skip{position:absolute;left:1rem;top:-4rem;z-index:100;background:var(--paper);color:var(--ink);
  padding:0.75rem 1rem;border-radius:var(--r-sm);font-weight:600;transition:top .2s var(--ease);}
.skip:focus{top:1rem;}

.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:1.5rem;}

.eyebrow{
  font-family:var(--body);font-size:var(--fs-xs);font-weight:600;
  text-transform:uppercase;letter-spacing:0.22em;color:var(--steel);
  display:inline-flex;align-items:center;gap:0.6rem;
}
.eyebrow::before{content:"";width:1.75rem;height:1px;background:var(--steel);opacity:.7;}
.paper .eyebrow{color:var(--steel-deep);}
.paper .eyebrow::before{background:var(--steel-deep);}

/* ---------- Шапка — island nav ---------- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:40;display:flex;justify-content:center;
  padding-top:1rem;pointer-events:none;}
.nav{
  pointer-events:auto;display:flex;align-items:center;gap:1.25rem;
  width:min(var(--maxw),calc(100% - 3rem));
  padding:0.6rem 0.7rem 0.6rem 1.4rem;
  background:rgba(18,22,29,0.72);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  border:1px solid var(--hairline);border-radius:999px;
  box-shadow:var(--shadow-dark);
}
.brand{font-family:var(--display);font-weight:600;font-size:var(--fs-lead);letter-spacing:-0.02em;white-space:nowrap;}
.brand span{color:var(--steel);}
.nav-spacer{flex:1;}

/* стилизованный <select> */
.jump{position:relative;display:inline-flex;align-items:center;}
.vh{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}
.jump select{
  appearance:none;-webkit-appearance:none;-moz-appearance:none;
  font-family:var(--body);font-size:var(--fs-sm);font-weight:500;color:var(--text);
  background:transparent;border:1px solid var(--hairline);border-radius:999px;
  padding:0.6rem 2.6rem 0.6rem 1.1rem;min-height:44px;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2368A6C4' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 1.1rem center;
  transition:border-color .25s var(--ease),background-color .25s var(--ease);
}
.jump select:hover{border-color:var(--steel);background-color:rgba(104,166,196,0.06);}
.jump select::-ms-expand{display:none;}
.jump select option{background:#0E1116;color:#E8ECF1;}

/* кнопки */
.btn{display:inline-flex;align-items:center;gap:0.7rem;font-family:var(--body);font-weight:600;
  font-size:var(--fs-sm);min-height:44px;padding:0.7rem 1.4rem;border-radius:999px;cursor:pointer;
  border:1px solid transparent;transition:transform .2s var(--ease),background-color .25s var(--ease),border-color .25s var(--ease);white-space:nowrap;}
.btn:active{transform:scale(.98);}
.btn-primary{background:var(--paper);color:var(--ink);}
.btn-primary:hover{background:#F6F8FB;}
.btn-primary .dot{width:1.6rem;height:1.6rem;border-radius:999px;background:rgba(14,17,22,0.08);
  display:inline-flex;align-items:center;justify-content:center;transition:transform .25s var(--ease);}
.btn-primary:hover .dot{transform:translate(2px,-1px);}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--hairline);}
.btn-ghost:hover{border-color:var(--steel);color:#FFFFFF;}
.paper .btn-ghost{color:var(--ink);border-color:var(--hairline-paper);}
.paper .btn-ghost:hover{border-color:var(--steel-deep);}
.nav .btn{flex-shrink:0;}

/* ---------- HERO ---------- */
.hero{position:relative;overflow:hidden;padding-top:9rem;padding-bottom:5rem;}
/* стальное «свечение экрана» — единственный фокальный градиент, финиш в фон */
.hero::before{content:"";position:absolute;z-index:0;inset:0;pointer-events:none;
  background:radial-gradient(58% 52% at 78% 30%,var(--steel-glow) 0%,rgba(104,166,196,0.05) 40%,rgba(14,17,22,0) 72%);}
.hero .wrap{position:relative;z-index:1;}
.hero-grid{display:grid;grid-template-columns:1.05fr 0.95fr;gap:clamp(2rem,5vw,4.5rem);align-items:center;}
.hero-copy{max-width:38rem;}
.hero h1{font-size:var(--fs-h1);font-weight:600;margin:1.4rem 0 0;text-wrap:balance;}
.hero h1 em{font-style:normal;color:var(--steel);}
.hero .lead{font-size:var(--fs-lead);line-height:1.5;color:var(--muted);margin-top:1.5rem;max-width:34rem;}
.hero-actions{display:flex;flex-wrap:wrap;gap:0.9rem;margin-top:2.25rem;}
.hero-divider{height:1px;background:var(--hairline);margin:2.5rem 0 1.25rem;}
.credits{display:flex;flex-wrap:wrap;gap:0.6rem 1.75rem;font-size:var(--fs-sm);color:var(--muted);
  text-transform:uppercase;letter-spacing:0.1em;}
.credits b{color:var(--text);font-weight:600;}
.credits span{display:inline-flex;align-items:center;gap:0.6rem;}
.credits span::before{content:"";width:5px;height:5px;border-radius:999px;background:var(--steel);}

/* Сигнатура: три плиты, одна подсвечена */
.plates{position:relative;height:min(30rem,72vw);}
.plate{position:absolute;left:50%;border-radius:var(--r);background:var(--panel);
  border:1px solid var(--hairline);box-shadow:var(--shadow-dark);
  display:flex;flex-direction:column;justify-content:flex-end;padding:1.4rem;}
.plate .tag{font-size:var(--fs-xs);font-weight:600;text-transform:uppercase;letter-spacing:0.18em;color:var(--muted);}
.plate .bars{display:flex;flex-direction:column;gap:0.55rem;margin-bottom:auto;}
.plate .bars i{display:block;height:6px;border-radius:999px;background:var(--hairline);}
.plate .bars i:nth-child(1){width:70%;}
.plate .bars i:nth-child(2){width:88%;}
.plate .bars i:nth-child(3){width:52%;}
.plate-1{width:60%;aspect-ratio:4/5;transform:translateX(-92%) rotate(-4deg);top:12%;opacity:.62;}
.plate-2{width:60%;aspect-ratio:4/5;transform:translateX(-30%) rotate(3deg);top:20%;opacity:.72;}
.plate-3{width:64%;aspect-ratio:4/5;transform:translateX(-44%) rotate(-1deg);top:0;
  border-color:rgba(104,166,196,0.55);background:linear-gradient(180deg,rgba(104,166,196,0.10),rgba(22,27,34,0.96));
  box-shadow:0 1px 2px rgba(6,10,16,0.5), 0 26px 60px -20px rgba(104,166,196,0.32);opacity:1;}
.plate-3 .tag{color:var(--steel);}
.plate-3 .bars i{background:rgba(104,166,196,0.4);}
.plate-3 .lit{margin-top:1rem;font-family:var(--display);font-weight:600;font-size:var(--fs-h3);color:var(--text);line-height:1.1;}

/* ---------- Секция «Как это устроено» (светлая) ---------- */
.paper{background:var(--paper);color:var(--ink);
  border-radius:var(--r-lg) var(--r-lg) 0 0;padding-top:5.5rem;padding-bottom:6rem;}
.section-head{max-width:44rem;}
.section-head h2{font-size:var(--fs-h2);color:var(--ink);margin:1.25rem 0 0;text-wrap:balance;}
.section-head .sub{font-size:var(--fs-lead);line-height:1.5;color:var(--slate);margin-top:1.1rem;}
.section-head .idx{color:var(--steel-deep);}

.steps{list-style:none;margin:3.5rem 0 0;padding:0;
  display:grid;grid-template-columns:repeat(4,1fr);gap:1.25rem;}
.step{position:relative;background:#FFFFFF;border-radius:var(--r);padding:1.75rem 1.5rem 1.85rem;
  box-shadow:var(--shadow-paper);display:flex;flex-direction:column;}
.step .num{font-family:var(--display);font-weight:700;font-size:var(--fs-num);color:var(--steel-deep);
  line-height:1;font-variant-numeric:tabular-nums;}
.step .rule{height:1px;background:var(--hairline-paper);margin:1.1rem 0 1.15rem;}
.step h3{font-size:var(--fs-h3);color:var(--ink);line-height:1.15;}
.step p{margin-top:0.7rem;font-size:var(--fs-sm);line-height:1.55;color:var(--slate);}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#AEB8C6;padding-top:3.5rem;padding-bottom:2.5rem;font-size:var(--fs-sm);}
.footer-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1.5rem;align-items:flex-start;}
.footer-top .brand{font-size:var(--fs-h3);color:var(--text);}
.footer-links{display:flex;flex-wrap:wrap;gap:1.5rem;}
.footer-links a{color:var(--muted);transition:color .2s var(--ease);}
.footer-links a:hover{color:var(--steel);}
.footer-req{margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--hairline);
  color:var(--muted);max-width:60ch;line-height:1.6;}
.footer-req .slot{color:var(--slate);}

/* ---------- Motion: один оркестрованный reveal (scroll-driven) ---------- */
@supports (animation-timeline:view()){
  @media (prefers-reduced-motion:no-preference){
    .reveal{animation:fade-up linear both;animation-timeline:view();
      animation-range:entry 5% cover 26%;}
    .steps .step{animation:fade-up linear both;animation-timeline:view();
      animation-range:entry 0% cover 22%;}
    .steps .step:nth-child(2){animation-range:entry 3% cover 24%;}
    .steps .step:nth-child(3){animation-range:entry 6% cover 26%;}
    .steps .step:nth-child(4){animation-range:entry 9% cover 28%;}
  }
}
@keyframes fade-up{from{opacity:0;transform:translateY(24px);}to{opacity:1;transform:translateY(0);}}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .reveal,.steps .step{animation:none;opacity:1;transform:none;}
}

/* ---------- Адаптив ---------- */
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;}
  .plates{height:24rem;margin-top:1rem;order:2;max-width:26rem;}
  .steps{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:640px){
  .wrap{padding-inline:1.15rem;}
  .nav{padding-left:1.1rem;gap:0.75rem;}
  .brand{font-size:var(--fs-body);}
  .jump{display:none;}                 /* на узком экране навигация не через select */
  .hero{padding-top:7.5rem;}
  .plates{height:20rem;}
  .plate-1,.plate-2,.plate-3{transform:none;position:relative;left:0;top:0;width:100%;margin-bottom:0.9rem;opacity:1;}
  .plate-1,.plate-2{display:none;}     /* на мобиле оставляем один подсвеченный «кадр» */
  .plate-3{aspect-ratio:16/10;}
  .steps{grid-template-columns:1fr;}
  .footer-top{flex-direction:column;}
}