/* Acody: каркас (меню слева, панель контента), токены светлой и тёмной темы,
   кнопки, формы, подвал. Страницы разделов — bank.css, личное — learn.css.
   Тема: data-theme на <html> (выбор посетителя, ui.js) или тема системы. */

:root {
  /* светлая */
  --frame: #0b0b0d;          /* фон за панелью и меню — тёмный в обеих темах */
  --bg: #f7f7f5;
  --surface: #ffffff;
  --surface-2: #f0f0ed;
  --line: rgba(17, 17, 19, .08);
  --line-2: rgba(17, 17, 19, .14);
  --text: #111113;
  --muted: #55555c;
  --faint: #8a8a91;
  --primary: #111113;        /* основные кнопки, этапы карты */
  --on-primary: #ffffff;
  --accent: #7c5cff;
  --accent-2: #5b3fd9;       /* акцент для текста и ссылок */
  --accent-soft: #ece8ff;    /* выделение: ячейки, подсветка в поиске */
  --teal: #0f766e;
  --warm: #c2410c;
  --good: #15803d;
  --bad: #dc2626;
  --code-bg: #111114;
  --code-text: #e7e7ea;
  --shadow: 0 1px 2px rgba(17, 17, 19, .04), 0 8px 24px -12px rgba(17, 17, 19, .12);
  --radius: 16px;
  --wrap: 1180px;
  --side: 284px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141416;
    --surface: #1b1b1e;
    --surface-2: #232327;
    --line: rgba(255, 255, 255, .08);
    --line-2: rgba(255, 255, 255, .14);
    --text: #f2f2f3;
    --muted: #a6a6ae;
    --faint: #75757d;
    --primary: #f2f2f3;
    --on-primary: #111113;
    --accent: #9b84ff;
    --accent-2: #b9a8ff;
    --accent-soft: rgba(155, 132, 255, .16);
    --teal: #5eead4;
    --warm: #fdba74;
    --good: #4ade80;
    --bad: #f87171;
    --code-bg: #0e0e10;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 32px -16px rgba(0, 0, 0, .6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #141416;
  --surface: #1b1b1e;
  --surface-2: #232327;
  --line: rgba(255, 255, 255, .08);
  --line-2: rgba(255, 255, 255, .14);
  --text: #f2f2f3;
  --muted: #a6a6ae;
  --faint: #75757d;
  --primary: #f2f2f3;
  --on-primary: #111113;
  --accent: #9b84ff;
  --accent-2: #b9a8ff;
  --accent-soft: rgba(155, 132, 255, .16);
  --teal: #5eead4;
  --warm: #fdba74;
  --good: #4ade80;
  --bad: #f87171;
  --code-bg: #0e0e10;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 32px -16px rgba(0, 0, 0, .6);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--frame);
  color: var(--text);
  font: 16px/1.6 "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-feature-settings: "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
h1, h2, h3 { line-height: 1.1; margin: 0; letter-spacing: -.025em; }
h1 { font-size: clamp(36px, 5vw, 64px); font-weight: 800; letter-spacing: -.045em; line-height: 1.02; }
h2 { font-size: clamp(24px, 2.6vw, 32px); font-weight: 700; }
h3 { font-size: 19px; font-weight: 700; }
p { margin: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 48px; }
section { position: relative; }
.kicker { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-weight: 600;
          font-size: 12.5px; letter-spacing: .08em; text-transform: uppercase; }
.lead { color: var(--muted); font-size: clamp(17px, 1.4vw, 19px); line-height: 1.55; max-width: 720px; }
.center { text-align: center; justify-items: center; }

/* ---- меню слева ---- */
.side { position: fixed; inset: 0 auto 0 0; z-index: 30; width: var(--side); display: flex; flex-direction: column;
        padding: 26px 18px 20px; color: #e8e8eb; background: var(--frame); overflow: hidden auto; }
/* волны за меню */
.side::before { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: .9;
  background:
    radial-gradient(90% 40% at 110% 38%, rgba(255, 255, 255, .07), transparent 70%),
    radial-gradient(70% 30% at -10% 78%, rgba(155, 132, 255, .10), transparent 70%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 272 900' preserveAspectRatio='none'%3E%3Cg fill='none' stroke='%23fff'%3E%3Cpath d='M300 220C170 300 250 420 120 520S-40 700 40 900' stroke-opacity='.07' stroke-width='60'/%3E%3Cpath d='M320 300C200 380 260 480 150 580S0 760 90 900' stroke-opacity='.05' stroke-width='2'/%3E%3Cpath d='M330 360C220 440 280 540 170 640S30 800 130 900' stroke-opacity='.05' stroke-width='1.5'/%3E%3C/g%3E%3C/svg%3E") center / 100% 100% no-repeat; }
.side .logo { color: #fff; margin: 0 10px 34px; }
.side-nav { display: grid; gap: 4px; }
.side-nav a { display: flex; align-items: center; gap: 13px; padding: 11px 14px; white-space: nowrap; border-radius: 12px; border: 1px solid transparent;
              color: #c9c9ce; font-size: 14.5px; font-weight: 500; transition: background .15s, color .15s; }
.side-nav a:hover { background: rgba(255, 255, 255, .04); color: #fff; text-decoration: none; }
.side-nav a.on { background: rgba(255, 255, 255, .07); border-color: rgba(255, 255, 255, .09); color: #fff;
                 box-shadow: inset 0 1px 0 rgba(255, 255, 255, .05); }
.side-nav .i { flex: none; opacity: .85; }
.side-nav a.on .i { opacity: 1; }

/* карта темы или курс урока под разделами */
.side-ctx { margin: 22px 0 18px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .08); display: grid; gap: 10px; }
.side-label { padding: 0 6px; color: #8a8a92; font-size: 12.5px; font-weight: 500; }
.ctx-title { display: flex; align-items: center; gap: 12px; padding: 4px 6px; color: #fff; font-size: 14px; line-height: 1.3; }
.ctx-title:hover { text-decoration: none; }
.ctx-ico { flex: none; width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center;
           background: linear-gradient(145deg, #2a2a30, #151518); border: 1px solid rgba(255, 255, 255, .1); color: #e8e8eb; }
.ctx-steps { list-style: none; margin: 4px 0 0; padding: 0; display: grid; gap: 2px; }
.ctx-steps a { display: flex; gap: 12px; align-items: baseline; padding: 7px 8px; border-radius: 9px; color: #b4b4bb; font-size: 13px; line-height: 1.35; }
.ctx-steps a:hover { background: rgba(255, 255, 255, .04); color: #fff; text-decoration: none; }
.ctx-steps .n { flex: none; color: #6f6f78; font-size: 12px; font-variant-numeric: tabular-nums; }
.ctx-steps li.open > a { color: #fff; }
.ctx-steps a.on { background: rgba(255, 255, 255, .07); color: #fff; }
.ctx-steps a.done::after { content: "✓"; margin-left: auto; color: #4ade80; font-size: 12px; }
.ctx-steps ul { list-style: none; margin: 2px 0 6px 18px; padding: 0 0 0 10px; border-left: 1px solid rgba(255, 255, 255, .1); display: grid; gap: 1px; }
.ctx-steps ul a { position: relative; padding: 6px 8px; font-size: 12.5px; color: #9c9ca4; }
.ctx-steps ul a.on { color: #fff; box-shadow: inset 2px 0 0 #9b84ff; border-radius: 0 9px 9px 0; }
.ctx-progress { margin-top: 8px; padding: 14px; border-radius: 14px; background: rgba(255, 255, 255, .04); border: 1px solid rgba(255, 255, 255, .08);
                display: grid; grid-template-columns: 1fr auto; gap: 8px; font-size: 12.5px; color: #9c9ca4; }
.ctx-progress[hidden] { display: none; }
.ctx-progress b { color: #fff; font-weight: 600; }
.ctx-progress i { grid-column: 1 / -1; height: 4px; border-radius: 4px; background: rgba(255, 255, 255, .1); overflow: hidden; }
.ctx-progress em { display: block; height: 100%; width: 0; background: #9b84ff; border-radius: 4px; }
.side-ctx + .side-partner { margin-top: auto; }

.side-partner { margin-top: auto; position: relative; display: grid; gap: 8px; padding: 18px 18px 20px; border-radius: 18px;
                background: rgba(255, 255, 255, .03); border: 1px solid rgba(255, 255, 255, .1); color: #e8e8eb; }
.side-partner:hover { text-decoration: none; border-color: rgba(255, 255, 255, .2); }
.sp-name { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; letter-spacing: -.02em; color: #fff; }
.side-partner b { font-size: 14px; line-height: 1.35; color: #fff; }
.sp-text { color: #9c9ca4; font-size: 12.5px; line-height: 1.5; padding-right: 44px; }
.sp-go { position: absolute; right: 16px; bottom: 16px; width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
         background: rgba(255, 255, 255, .08); color: #fff; }
.side-shade { display: none; }

/* ---- панель контента ---- */
.shell { margin-left: var(--side); padding: 12px 12px 12px 0; min-height: 100vh; }
.panel { background: var(--bg); border-radius: 24px; min-height: calc(100vh - 24px); overflow: clip;
         border: 1px solid rgba(255, 255, 255, .06); }

.logo { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; font-size: 25px;
        letter-spacing: -.04em; text-transform: lowercase; }
.logo:hover { text-decoration: none; }
.logo .mark { flex: none; }

/* ---- верхняя панель ---- */
.bar { display: flex; align-items: center; gap: 14px; min-height: 76px; margin: 0 40px; border-bottom: 1px solid var(--line); }
.bar-btn { flex: none; display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; border: 0;
           background: transparent; color: var(--text); cursor: pointer; }
.bar-btn:hover { background: var(--surface-2); text-decoration: none; }
.bar-menu { display: none; }
.bar .crumbs { min-width: 0; flex: 1; display: flex; align-items: center; gap: 10px; flex-wrap: nowrap; overflow: hidden;
               font-size: 13.5px; color: var(--faint); white-space: nowrap; }
.bar .crumbs a { color: var(--muted); }
.bar .crumbs a:last-of-type { color: var(--text); }
.bar .crumbs > span:last-child { color: var(--faint); overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.bar-tools { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.bar-sep { width: 1px; height: 24px; background: var(--line-2); }
.theme-btn .i-moon { display: none; }
:root[data-theme="dark"] .theme-btn .i-sun { display: none; }
:root[data-theme="dark"] .theme-btn .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-btn .i-sun { display: none; }
  :root:not([data-theme="light"]) .theme-btn .i-moon { display: block; }
}

/* поиск */
.search { position: relative; display: flex; align-items: center; gap: 8px; width: 230px; height: 40px; padding: 0 10px 0 12px;
          border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); color: var(--faint); }
.search:focus-within { border-color: var(--line-2); background: var(--surface); }
.search .i { flex: none; color: var(--muted); }
.search input { flex: 1; min-width: 0; height: 100%; border: 0; padding: 0; background: none; color: var(--text); font: inherit; font-size: 14px; }
.search input:focus { outline: none; }
.search input::-webkit-search-cancel-button { display: none; }
.search kbd { flex: none; font: 600 11px/1 "Inter", sans-serif; color: var(--faint); padding: 4px 6px; border-radius: 6px; border: 1px solid var(--line-2); }
.search:focus-within kbd { display: none; }
.search-out { position: absolute; z-index: 40; top: calc(100% + 8px); right: 0; width: min(440px, 86vw); max-height: 70vh; overflow: auto;
              padding: 6px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line-2); box-shadow: var(--shadow); }
.search-out a { display: flex; justify-content: space-between; align-items: baseline; gap: 14px; padding: 9px 12px; border-radius: 9px;
                color: var(--text); font-size: 14px; line-height: 1.35; }
.search-out a:hover, .search-out a.on { background: var(--surface-2); text-decoration: none; }
.search-out small { flex: none; color: var(--faint); font-size: 12px; }
.search-out mark { background: var(--accent-soft); color: inherit; border-radius: 3px; }
.search-out p { padding: 10px 12px; color: var(--faint); font-size: 14px; }

/* аккаунт */
.account { display: flex; align-items: center; }
.avatar { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; background: var(--primary); color: var(--on-primary);
          font-weight: 700; font-size: 15px; }
.avatar:hover { text-decoration: none; opacity: .85; }

/* ---- кнопки ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 46px; padding: 0 22px;
       border-radius: 12px; font-family: inherit; font-size: 15px; font-weight: 600; line-height: 1; border: 1px solid transparent; cursor: pointer;
       transition: background .15s, border-color .15s, opacity .15s; white-space: nowrap; color: var(--text); background: var(--surface); }
.btn:hover { text-decoration: none; }
.btn.primary { background: var(--primary); color: var(--on-primary); }
.btn.primary:hover { opacity: .88; }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--line-2); }
.btn.ghost:hover { background: var(--surface-2); }
.btn.small { height: 38px; padding: 0 16px; font-size: 14px; border-radius: 10px; }

/* ---- формы ---- */
form { display: grid; gap: 14px; }
label { display: grid; gap: 6px; font-size: 14px; color: var(--muted); font-weight: 500; }
input, select, textarea { font: inherit; font-size: 15px; color: var(--text); background: var(--surface); border: 1px solid var(--line-2);
                          border-radius: 10px; padding: 10px 12px; width: 100%; }
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 50%, transparent); border-color: transparent; }
input[type=checkbox], input[type=radio] { width: auto; accent-color: var(--accent); }
textarea { resize: vertical; min-height: 84px; }

/* ---- подвал ---- */
footer { margin: 40px 40px 0; border-top: 1px solid var(--line); padding: 36px 0 44px; color: var(--faint); font-size: 13.5px; }
footer .wrap { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; padding: 0; max-width: none; }
footer .logo { font-size: 21px; }
footer .logo .mark { width: 24px; height: 24px; }
footer p { margin-top: 12px; max-width: 320px; }
footer h4 { color: var(--text); font-size: 13.5px; font-weight: 600; margin: 0 0 10px; }
footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
footer a { color: var(--muted); }

/* ---- партнёр внизу страницы ---- */
.partner { padding: 24px 48px 8px; }
.partner .wrap { display: flex; flex-wrap: wrap; gap: 24px; align-items: center; justify-content: space-between;
                 max-width: calc(var(--wrap) - 96px); margin: 0 auto; padding: 28px 32px;
                 background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); }
.partner .wrap > div { max-width: 640px; }
.partner h2 { font-size: 24px; margin: 8px 0 8px; }
.partner p { color: var(--muted); margin: 0; }

/* ---- узкие экраны ---- */
@media (max-width: 1100px) {
  .search { width: 190px; }
  footer .wrap { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 960px) {
  .side { transform: translateX(-100%); transition: transform .2s ease, visibility .2s; visibility: hidden; }
  .side-open .side { transform: none; visibility: visible; box-shadow: 20px 0 60px rgba(0, 0, 0, .4); }
  .side-open .side-shade { display: block; position: fixed; inset: 0; z-index: 25; background: rgba(0, 0, 0, .5); }
  .shell { margin-left: 0; padding: 0; }
  .panel { border-radius: 0; min-height: 100vh; border: 0; }
  .bar { margin: 0 16px; min-height: 64px; gap: 8px; }
  .bar-menu { display: grid; margin-left: -6px; }
  .bar .crumbs, .bar-back { display: none; }
  .bar-tools { flex: 1; gap: 8px; }
  .search { flex: 1; width: auto; }
  .search kbd, .bar-sep { display: none; }
  .wrap { padding: 0 20px; }
  .partner { padding: 20px 20px 4px; }
  .partner .wrap { padding: 22px; }
  footer { margin: 32px 20px 0; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .partner { padding: 16px 16px 4px; }
  footer { margin: 28px 16px 0; }
  footer .wrap { grid-template-columns: 1fr; gap: 24px; }
  .btn { width: 100%; }
  .account .btn { width: auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .side, .side-nav a { transition: none; }
}
@media print {
  .side, .bar, footer, .partner { display: none !important; }
  body, .panel { background: #fff !important; color: #000 !important; }
  .shell { margin: 0; padding: 0; }
  .panel { border: 0; }
}