/* ============================================================
   Физическая химия · Анимированные демонстрации
   Общая таблица стилей (тёмная тёплая тема)
   Спутник расширенного конспекта (химическая термодинамика)
   ============================================================ */
:root{
  --bg:#14110E; --panel:#1B1712; --panel2:#221D17;
  --ink:#EFE7DA; --muted:#B6AB99; --faint:#7E7464;
  --teal:#4FB3A0; --teal-d:#2E8B7A; --coral:#E8775B; --gold:#D9A441; --violet:#9C7BD0; --blue:#5B9BD5;
  --grid:rgba(214,198,170,0.10); --grid2:rgba(214,198,170,0.05); --line:rgba(214,198,170,0.14);
  /* акценты 10 блоков (яркие, под тёмный фон) */
  --b1:#3FB0C9; --b2:#E8775B; --b3:#B07BD0; --b4:#5FB37A; --b5:#46B5A6;
  --b6:#E06A8E; --b7:#8C7BE6; --b8:#D9A441; --b9:#A6B84A; --b10:#5B9BD5;
  --accent:#4FB3A0; /* акцент текущей страницы (переопределяется на body) */
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0; background:
    radial-gradient(1200px 700px at 80% -10%, rgba(79,179,160,0.07), transparent 60%),
    radial-gradient(900px 600px at -10% 18%, rgba(232,119,91,0.06), transparent 55%),
    radial-gradient(700px 500px at 50% 120%, rgba(156,123,208,0.05), transparent 60%), var(--bg);
  color:var(--ink); font-family:"Spectral",Georgia,serif; font-size:18px; line-height:1.62; -webkit-font-smoothing:antialiased;}
.wrap{max-width:940px; margin:0 auto; padding:46px 22px 110px}

/* ---------- typography ---------- */
.eyebrow{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:13px; letter-spacing:0.22em; color:var(--accent); text-transform:uppercase}
h1{font-family:"Fraunces",Georgia,serif; font-weight:600; font-size:clamp(30px,5.6vw,50px); line-height:1.06; letter-spacing:-0.01em; margin:10px 0 14px}
h1 .sub{display:block; font-size:clamp(15px,2.6vw,20px); font-weight:400; font-style:italic; color:var(--muted); margin-top:14px; letter-spacing:0}
h2{font-family:"Fraunces",Georgia,serif; font-weight:600; font-size:clamp(23px,4vw,32px); letter-spacing:-0.01em; margin:0 0 6px}
h3{font-family:"Fraunces",Georgia,serif; font-weight:600; font-size:20px; margin:26px 0 8px}
.lead{color:var(--muted); font-size:19px}
.sec-num{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:13px; letter-spacing:0.22em; color:var(--accent); text-transform:uppercase}
section{margin-top:54px; padding-top:8px}
p{margin:12px 0}
strong{color:var(--ink); font-weight:600}
em.t{color:var(--teal); font-style:normal} em.c{color:var(--coral); font-style:normal}
em.g{color:var(--gold); font-style:normal} em.v{color:var(--violet); font-style:normal}
em.a{color:var(--accent); font-style:normal}
sub,sup{line-height:0}
.divider{height:1px; background:linear-gradient(90deg,transparent,var(--line) 12%,var(--line) 88%,transparent); margin:50px 0 0}

/* ---------- top nav ---------- */
.topbar{position:sticky; top:0; z-index:20; backdrop-filter:blur(8px);
  background:linear-gradient(180deg,rgba(20,17,14,0.92),rgba(20,17,14,0.66));
  border-bottom:1px solid var(--line)}
.topbar .in{max-width:940px; margin:0 auto; padding:11px 22px; display:flex; align-items:center; gap:16px; flex-wrap:wrap}
.topbar a.home{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:13px; letter-spacing:0.08em; color:var(--ink); text-decoration:none; display:flex; align-items:center; gap:9px}
.topbar a.home .dot{width:10px; height:10px; border-radius:50%; background:linear-gradient(135deg,var(--accent),var(--gold))}
.topbar a.home:hover{color:var(--accent)}
.topbar nav{display:flex; gap:4px 5px; flex-wrap:wrap; margin-left:auto; font-family:"JetBrains Mono",ui-monospace,monospace; font-size:11.5px}
.topbar nav a{color:var(--muted); text-decoration:none; padding:5px 9px; border-radius:7px; border:1px solid transparent; transition:.15s}
.topbar nav a:hover{color:var(--ink); border-color:var(--line); background:rgba(214,198,170,0.05)}
.topbar nav a.cur{color:var(--accent); border-color:color-mix(in srgb,var(--accent) 45%,transparent); background:color-mix(in srgb,var(--accent) 12%,transparent)}

/* ---------- block cards on landing ---------- */
.bgrid{display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-top:26px}
@media(max-width:680px){.bgrid{grid-template-columns:1fr}}
.bcard{display:block; text-decoration:none; color:inherit; position:relative; overflow:hidden;
  background:linear-gradient(180deg,var(--panel),var(--panel2)); border:1px solid var(--line);
  border-radius:16px; padding:22px 22px 20px; transition:.18s; box-shadow:0 20px 50px -34px rgba(0,0,0,0.85)}
.bcard:hover{transform:translateY(-3px); border-color:color-mix(in srgb,var(--ca,#4FB3A0) 55%,transparent); box-shadow:0 28px 60px -34px rgba(0,0,0,0.9)}
.bcard .tag{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:12px; letter-spacing:0.14em;
  text-transform:uppercase; color:#15110d; font-weight:600; padding:3px 10px; border-radius:20px; display:inline-block; background:var(--ca,#4FB3A0)}
.bcard h3{font-family:"Fraunces",Georgia,serif; font-size:22px; margin:14px 0 6px; color:var(--ink)}
.bcard p{color:var(--muted); font-size:14.5px; margin:6px 0 0}
.bcard .demos{margin-top:14px; font-family:"JetBrains Mono",ui-monospace,monospace; font-size:11.5px; color:var(--faint)}
.bcard .demos span{color:var(--muted)}
.bcard .arrow{position:absolute; right:20px; bottom:18px; font-family:"JetBrains Mono",monospace; color:var(--faint); transition:.18s}
.bcard:hover .arrow{color:var(--ca,#4FB3A0); transform:translateX(3px)}
.bcard .stripe{position:absolute; left:0; top:0; bottom:0; width:5px; background:var(--ca,#4FB3A0)}
/* привязка акцента карточки */
.c-b1{--ca:var(--b1)} .c-b2{--ca:var(--b2)} .c-b3{--ca:var(--b3)} .c-b4{--ca:var(--b4)} .c-b5{--ca:var(--b5)}
.c-b6{--ca:var(--b6)} .c-b7{--ca:var(--b7)} .c-b8{--ca:var(--b8)} .c-b9{--ca:var(--b9)} .c-b10{--ca:var(--b10)}

/* ---------- demo card ---------- */
.card{background:linear-gradient(180deg,var(--panel),var(--panel2)); border:1px solid var(--line); border-radius:14px; padding:20px 20px 18px; margin:22px 0; box-shadow:0 20px 50px -30px rgba(0,0,0,0.8)}
.card h4{font-family:"JetBrains Mono",ui-monospace,monospace; font-weight:500; font-size:12.5px; letter-spacing:0.16em; text-transform:uppercase; color:var(--gold); margin:0 0 4px}
.card .cap{color:var(--muted); font-size:15.5px; margin:2px 0 12px}
canvas{display:block; width:100%; border-radius:9px; background:rgba(0,0,0,0.22)}

/* ---------- controls ---------- */
.controls{display:flex; flex-wrap:wrap; gap:14px 22px; align-items:center; margin-top:14px}
.ctl{display:flex; align-items:center; gap:10px; font-family:"JetBrains Mono",ui-monospace,monospace; font-size:13px; color:var(--muted)}
.ctl .val{color:var(--accent); min-width:46px}
input[type=range]{-webkit-appearance:none; appearance:none; width:150px; height:3px; background:var(--line); border-radius:3px; outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none; width:15px; height:15px; border-radius:50%; background:var(--accent); cursor:pointer; box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 18%,transparent)}
input[type=range]::-moz-range-thumb{width:15px; height:15px; border:none; border-radius:50%; background:var(--accent); cursor:pointer}
button{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:12.5px; letter-spacing:0.06em; color:var(--ink); background:color-mix(in srgb,var(--accent) 12%,transparent); border:1px solid color-mix(in srgb,var(--accent) 40%,transparent); padding:7px 14px; border-radius:8px; cursor:pointer; transition:.15s}
button:hover{background:color-mix(in srgb,var(--accent) 22%,transparent)}
button:active{transform:translateY(1px)}
.chips{display:flex; flex-wrap:wrap; gap:8px; margin-top:6px}
.chip{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:12px; padding:6px 12px; border-radius:20px; border:1px solid var(--line); color:var(--muted); cursor:pointer; transition:.15s; user-select:none}
.chip.on{background:color-mix(in srgb,var(--accent) 16%,transparent); border-color:color-mix(in srgb,var(--accent) 50%,transparent); color:var(--accent)}
.chip:hover{color:var(--ink)}

/* ---------- info bits ---------- */
.legend{display:flex; flex-wrap:wrap; gap:6px 18px; font-family:"JetBrains Mono",ui-monospace,monospace; font-size:12px; color:var(--muted); margin-top:10px}
.legend i{display:inline-block; width:16px; height:3px; border-radius:2px; margin-right:7px; vertical-align:middle}
.legend i.box{height:11px; width:11px; border-radius:3px}
.readout{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:13px; color:var(--muted); display:flex; flex-wrap:wrap; gap:6px 22px; margin-top:12px}
.readout b{color:var(--gold); font-weight:500}
.eq{font-family:"JetBrains Mono",ui-monospace,monospace; background:rgba(0,0,0,0.28); border:1px solid var(--line); border-left:3px solid var(--accent); border-radius:8px; padding:12px 16px; margin:16px 0; font-size:14.5px; color:var(--ink); overflow-x:auto}
.note{border-left:3px solid var(--coral); padding:4px 0 4px 16px; color:var(--muted); font-style:italic; margin:14px 0}
.kbd{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:12px; background:rgba(0,0,0,.3); border:1px solid var(--line); padding:1px 6px; border-radius:5px; color:var(--muted)}
.pill{display:inline-block; font-family:"JetBrains Mono",monospace; font-size:11px; letter-spacing:0.08em; padding:2px 9px; border-radius:14px; border:1px solid var(--line); color:var(--muted)}

/* energy / progress bar */
.ebar{position:relative; height:30px; border-radius:7px; overflow:hidden; border:1px solid var(--line); background:rgba(232,119,91,0.10); margin-top:14px}
.ebar .fill{position:absolute; left:0; top:0; bottom:0; width:0%; background:linear-gradient(90deg,var(--teal-d),var(--gold)); transition:width .12s linear}
.ebar .full{position:absolute; right:0; top:0; bottom:0; width:1px; background:var(--ink)}
.ebar .lab{position:absolute; right:8px; top:5px; font-family:"JetBrains Mono",monospace; font-size:11px; color:var(--ink); opacity:.8}

.grid2{display:grid; grid-template-columns:1fr 1fr; gap:14px} @media(max-width:680px){.grid2{grid-template-columns:1fr}}

/* prev/next footer nav */
.pager{display:flex; justify-content:space-between; gap:14px; margin-top:60px; flex-wrap:wrap}
.pager a{flex:1; min-width:200px; text-decoration:none; color:var(--muted); border:1px solid var(--line); border-radius:12px; padding:14px 16px; transition:.15s; background:linear-gradient(180deg,var(--panel),var(--panel2))}
.pager a:hover{color:var(--ink); border-color:color-mix(in srgb,var(--accent) 45%,transparent)}
.pager a .k{font-family:"JetBrains Mono",monospace; font-size:11px; letter-spacing:0.12em; text-transform:uppercase; color:var(--faint)}
.pager a .t{font-family:"Fraunces",Georgia,serif; font-size:18px; display:block; margin-top:3px; color:var(--ink)}
.pager a.next{text-align:right}

.foot{margin-top:64px; color:var(--faint); font-size:14px; font-style:italic; text-align:center}
.toc{font-family:"JetBrains Mono",ui-monospace,monospace; font-size:13px; color:var(--muted); display:flex; flex-wrap:wrap; gap:10px 20px; margin-top:22px}
.toc a{color:var(--muted); text-decoration:none; border-bottom:1px dashed var(--line)} .toc a:hover{color:var(--accent)}
.eq2{display:block}
/* инлайн-формулы (HTML/Unicode вместо сырого LaTeX): держим формулу одной строкой */
.m{white-space:nowrap}
.m sub{font-size:0.78em} .m sup{font-size:0.78em}