/* ============================================================
   Электрические сети — тренажёр теста
   Design: dark-first glass/aurora UI, gradient brand accent
   ============================================================ */

:root{
  --bg:#0a0d16;
  --surface:#141a29;
  --surface2:#1b2233;
  --text:#f4f6fb;
  --hint:#8b93ac;
  --border: color-mix(in srgb, #ffffff 10%, transparent);

  --accent:#7c5cff;
  --accent2:#22d3ee;
  --accent3:#ff5fae;
  --accent-grad: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  --accent-grad-vivid: linear-gradient(135deg, #8a6bff 0%, #22d3ee 55%, #2fe0a8 100%);

  --ok:#2fe0a8; --ok-bg: color-mix(in srgb, var(--ok) 16%, transparent);
  --bad:#ff5470; --bad-bg: color-mix(in srgb, var(--bad) 16%, transparent);
  --warn:#ffb84d; --warn-bg: color-mix(in srgb, var(--warn) 16%, transparent);

  --glass: color-mix(in srgb, var(--surface) 66%, transparent);
  --glass-strong: color-mix(in srgb, var(--surface) 86%, transparent);

  --radius-lg:26px; --radius:20px; --radius-sm:14px;
  --shadow-soft: 0 10px 30px -10px rgba(0,0,0,.5);
  --shadow-glow: 0 12px 34px -8px color-mix(in srgb, var(--accent) 55%, transparent);
  --font: 'Manrope', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Светлая тема (по умолчанию). Тема задаётся атрибутом data-theme на <html>,
   поэтому не зависит ни от темы ОС, ни от темы Telegram. */
:root[data-theme="light"]{
  --bg:#f2f3fb;
  --surface:#ffffff;
  --surface2:#f6f7fd;
  --text:#141620;
  --hint:#6c7286;
  --border: color-mix(in srgb, #141620 9%, transparent);
  --ok:#12b886; --bad:#e8384f; --warn:#f08c00;
  --glass: color-mix(in srgb, var(--surface) 82%, transparent);
  --glass-strong: color-mix(in srgb, var(--surface) 94%, transparent);
  --shadow-soft: 0 10px 30px -12px rgba(30,20,80,.18);
}
:root[data-theme="light"]{ color-scheme:light; }
:root[data-theme="dark"]{ color-scheme:dark; }

*{box-sizing:border-box; -webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0; overscroll-behavior-y:none}
body{
  background:var(--bg); color:var(--text);
  font-family:var(--font);
  font-size:16px; line-height:1.45;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
::selection{ background: color-mix(in srgb, var(--accent) 45%, transparent); color:#fff; }

/* scrollbar */
*::-webkit-scrollbar{width:8px;height:8px}
*::-webkit-scrollbar-track{background:transparent}
*::-webkit-scrollbar-thumb{background: color-mix(in srgb, var(--accent) 40%, transparent); border-radius:8px}

:focus-visible{ outline: 2px solid var(--accent2); outline-offset:2px; border-radius:8px; }

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}

/* ===== Background aurora ===== */
.bg-glow{ position:fixed; inset:0; z-index:0; overflow:hidden; pointer-events:none; background:var(--bg); }
.bg-glow .blob{ position:absolute; border-radius:50%; filter:blur(70px); opacity:.55; will-change:transform; }
.bg-glow .b1{ width:52vmax; height:52vmax; left:-18vmax; top:-22vmax; background:radial-gradient(circle at 30% 30%, var(--accent), transparent 70%); animation: drift1 22s ease-in-out infinite alternate; }
.bg-glow .b2{ width:46vmax; height:46vmax; right:-16vmax; top:8vmax; background:radial-gradient(circle at 60% 40%, var(--accent2), transparent 70%); animation: drift2 26s ease-in-out infinite alternate; }
.bg-glow .b3{ width:44vmax; height:44vmax; left:8vmax; bottom:-20vmax; background:radial-gradient(circle at 50% 50%, var(--accent3), transparent 70%); opacity:.35; animation: drift3 30s ease-in-out infinite alternate; }
:root[data-theme="light"] .bg-glow .blob{ opacity:.30; filter:blur(90px); }
@keyframes drift1{ from{ transform:translate(0,0) scale(1);} to{ transform:translate(6vmax,4vmax) scale(1.12);} }
@keyframes drift2{ from{ transform:translate(0,0) scale(1);} to{ transform:translate(-5vmax,6vmax) scale(1.08);} }
@keyframes drift3{ from{ transform:translate(0,0) scale(1);} to{ transform:translate(4vmax,-5vmax) scale(1.1);} }
.bg-glow .grain{
  position:absolute; inset:0; opacity:.035; mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ===== Loader ===== */
.loader{ position:fixed; inset:0; z-index:100; display:flex; flex-direction:column; align-items:center; justify-content:center; gap:14px; background:var(--bg); transition:opacity .45s ease, visibility .45s ease; }
.loader.hide{ opacity:0; visibility:hidden; pointer-events:none; }
.loader-badge{ width:64px;height:64px;border-radius:20px; background:var(--accent-grad); display:flex;align-items:center;justify-content:center; font-size:30px; box-shadow: var(--shadow-glow); animation: pulse 1.4s ease-in-out infinite; }
.loader-text{ color:var(--hint); font-size:13px; font-weight:600; letter-spacing:.2px; }
@keyframes pulse{ 0%,100%{ transform:scale(1); } 50%{ transform:scale(1.08); } }

/* ===== App shell ===== */
#app{ position:relative; z-index:1; max-width:640px; margin:0 auto; min-height:100vh; display:flex; flex-direction:column; }
.screen{ padding:16px; flex:1; display:flex; flex-direction:column; animation: screenIn .5s cubic-bezier(.16,1,.3,1) both; }
.hidden{ display:none!important; }
@keyframes screenIn{ from{ opacity:0; transform:translateY(10px); } to{ opacity:1; transform:translateY(0); } }

@media (min-width:700px){
  body{ display:flex; }
  #app{ margin:28px auto; max-height:calc(100vh - 56px); border-radius:32px; overflow:hidden; box-shadow: 0 30px 80px -20px rgba(0,0,0,.55), 0 0 0 1px var(--border); background:var(--bg); }
  .screen{ overflow-y:auto; scrollbar-gutter:stable; }
  .quiz-scroll{ scrollbar-gutter:stable; }
}

/* ===== Home header ===== */
.home-head{ text-align:center; padding:22px 0 4px; }
.logo{ display:inline-flex; align-items:center; justify-content:center; width:72px; height:72px; border-radius:22px; background:var(--accent-grad); box-shadow: var(--shadow-glow); position:relative; }
.logo span{ font-size:34px; filter:drop-shadow(0 2px 6px rgba(0,0,0,.35)); animation: pulse 3s ease-in-out infinite; }
.home-head h1{ font-size:27px; margin:16px 0 6px; font-weight:800; letter-spacing:-.5px; }
.home-head h1 .grad{
  background: var(--accent-grad-vivid); background-size:200% auto;
  -webkit-background-clip:text; background-clip:text; color:transparent;
  animation: shine 6s linear infinite;
}
@keyframes shine{ to{ background-position:200% center; } }
.sub{
  color:var(--hint); font-size:12.5px; margin:0; font-weight:600;
  display:inline-flex; align-items:center; gap:4px; padding:7px 14px; border-radius:999px;
  background:var(--glass); border:1px solid var(--border);
  -webkit-backdrop-filter:blur(16px); backdrop-filter:blur(16px);
}
.sub #qtotal{ color:var(--text); font-weight:800; }

/* ===== Stat cards ===== */
.stat-row{ display:flex; gap:8px; margin:18px 0 6px; }
.stat{
  flex:1; background:var(--glass); border:1px solid var(--border);
  -webkit-backdrop-filter:blur(16px); backdrop-filter:blur(16px);
  border-radius:var(--radius-sm); padding:14px 8px; text-align:center;
  box-shadow: var(--shadow-soft);
}
.stat b{ display:block; font-size:22px; font-weight:800; background:var(--accent-grad); -webkit-background-clip:text; background-clip:text; color:transparent; }
.stat span{ font-size:10.5px; color:var(--hint); font-weight:700; text-transform:uppercase; letter-spacing:.3px; }

/* ===== Mode buttons ===== */
.modes{ display:flex; flex-direction:column; gap:10px; margin:18px 0; }
.mode-btn{
  position:relative; display:flex; align-items:center; gap:13px; text-align:left;
  background:var(--glass); border:1px solid var(--border); border-radius:var(--radius);
  padding:14px 16px; color:var(--text); font-size:16px; font-family:var(--font); cursor:pointer;
  -webkit-backdrop-filter:blur(16px); backdrop-filter:blur(16px);
  box-shadow: var(--shadow-soft);
  transition: transform .15s cubic-bezier(.34,1.56,.64,1), box-shadow .2s ease, border-color .2s ease;
}
.mode-btn:active{ transform:scale(.97); }
.mode-btn::after{
  content:'›'; margin-left:auto; font-size:22px; font-weight:800; color:var(--hint); opacity:.55;
  transition: transform .2s ease;
}
.mode-btn:active::after{ transform:translateX(3px); }
.mode-btn .mi{
  flex:none; width:46px; height:46px; border-radius:14px; font-size:21px;
  display:flex; align-items:center; justify-content:center;
  background:var(--surface2); box-shadow: inset 0 0 0 1px var(--border);
}
.mode-btn > span:not(.mi){ display:flex; flex-direction:column; gap:1px; }
.mode-btn b{ font-weight:750; font-size:15px; letter-spacing:-.1px; }
.mode-btn i{ font-style:normal; font-size:12px; opacity:.65; font-weight:500; }

.mode-btn.primary{
  background: var(--accent-grad); border:none; color:#fff;
  box-shadow: var(--shadow-glow);
}
.mode-btn.primary .mi{ background: color-mix(in srgb, #fff 22%, transparent); box-shadow:none; }
.mode-btn.primary i{ opacity:.85; }
.mode-btn.primary::after{ color:#fff; opacity:.8; }

.mode-btn[data-mode="random"] .mi{ background:linear-gradient(135deg,#ff9f43,#ff5fae); }
.mode-btn[data-mode="wrong"] .mi{ background:linear-gradient(135deg,#ff5470,#ff9f43); }
.mode-btn[data-mode="flagged"] .mi{ background:linear-gradient(135deg,#ffd166,#ff9f43); }

/* ===== Toggle switch ===== */
.opts{ margin:2px 0 8px; }
.switch{ display:flex; align-items:center; gap:11px; font-size:13.5px; color:var(--hint); font-weight:600; padding:8px 4px; cursor:pointer; }
.switch input{
  appearance:none; -webkit-appearance:none; width:42px; height:25px; border-radius:20px;
  background:var(--surface2); box-shadow: inset 0 0 0 1px var(--border);
  position:relative; cursor:pointer; transition: background .25s ease; flex:none;
}
.switch input::after{
  content:''; position:absolute; top:2.5px; left:3px; width:20px; height:20px; border-radius:50%;
  background:#fff; box-shadow:0 2px 6px rgba(0,0,0,.35); transition: left .25s cubic-bezier(.34,1.56,.64,1);
}
.switch input:checked{ background: var(--accent-grad); }
.switch input:checked::after{ left:19px; }

/* ===== Sections ===== */
.section-title{ font-size:13px; text-transform:uppercase; letter-spacing:.8px; color:var(--hint); margin:20px 3px 9px; font-weight:800; display:flex; align-items:center; gap:6px; }
.section-title::before{ content:''; width:5px; height:5px; border-radius:50%; background:var(--accent-grad); }

.section-list{ display:flex; flex-direction:column; gap:7px; }
.sec-item{
  display:flex; align-items:center; gap:12px; background:var(--glass); border:1px solid var(--border);
  -webkit-backdrop-filter:blur(14px); backdrop-filter:blur(14px);
  border-radius:16px; padding:11px 13px; color:var(--text); text-align:left; cursor:pointer; width:100%;
  font-size:15px; font-family:var(--font); transition: transform .15s ease, border-color .2s ease;
}
.sec-item:active{ transform:scale(.98); }
.sec-num{
  flex:none; width:32px; height:32px; border-radius:10px; display:flex; align-items:center; justify-content:center;
  font-weight:800; font-size:13px; color:#fff; background:var(--accent-grad);
}
.sec-item:nth-of-type(4n+2) .sec-num{ background:linear-gradient(135deg,#22d3ee,#2fe0a8); }
.sec-item:nth-of-type(4n+3) .sec-num{ background:linear-gradient(135deg,#ff9f43,#ff5fae); }
.sec-item:nth-of-type(4n+4) .sec-num{ background:linear-gradient(135deg,#ffd166,#ff9f43); }
.sec-body{ flex:1; min-width:0; }
.sec-name{ font-size:13.5px; font-weight:700; display:block; line-height:1.25; }
.sec-meta{ font-size:10.5px; color:var(--hint); font-weight:600; }

.sec-ring{
  --pct:0; flex:none; width:38px; height:38px; border-radius:50%; position:relative;
  background: conic-gradient(var(--accent) calc(var(--pct)*1%), var(--border) 0);
  transition: background .5s ease;
}
.sec-ring::before{ content:''; position:absolute; inset:3.5px; border-radius:50%; background:var(--surface); }
.sec-ring span{ position:relative; display:flex; align-items:center; justify-content:center; height:100%; font-size:9.5px; font-weight:800; color:var(--text); }

.ghost-btn{
  background:transparent; border:1.5px solid var(--border); color:var(--hint);
  border-radius:var(--radius-sm); padding:13px; font-size:14px; font-weight:700; font-family:var(--font);
  margin-top:18px; cursor:pointer; width:100%; transition: border-color .2s ease, color .2s ease, background .2s ease;
}
.ghost-btn:active{ background:var(--glass); }
.footnote{ font-size:11px; color:var(--hint); text-align:center; margin:14px 6px 10px; line-height:1.5; opacity:.85; }

/* ============================================================
   QUIZ
   ============================================================ */
#quiz{ padding:0; }
.quiz-top{
  display:flex; align-items:center; gap:12px; padding:14px 16px;
  position:sticky; top:0; z-index:5;
  background: var(--glass-strong); -webkit-backdrop-filter:blur(20px); backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
}
.icon-btn{
  background:var(--surface2); border:1px solid var(--border); color:var(--text);
  width:34px; height:34px; border-radius:11px; font-size:15px; cursor:pointer; flex:none;
  transition: transform .15s ease;
}
.icon-btn:active{ transform:scale(.9); }
.progress{ flex:1; height:8px; background:var(--surface2); border-radius:6px; overflow:hidden; box-shadow: inset 0 0 0 1px var(--border); }
.progress-bar{ height:100%; width:0; background:var(--accent-grad-vivid); background-size:200% 100%; border-radius:6px; transition: width .3s cubic-bezier(.16,1,.3,1); animation: shine 4s linear infinite; }
.counter{ font-size:12.5px; color:var(--hint); font-weight:800; font-variant-numeric:tabular-nums; flex:none; min-width:40px; text-align:right; }

.quiz-scroll{ flex:1; overflow-y:auto; padding:14px 16px 16px; }

.qmeta{ display:flex; gap:7px; flex-wrap:wrap; margin:2px 0 12px; animation: fadeUp .4s ease both; }
.chip{
  font-size:11px; padding:5px 11px; border-radius:20px; background:var(--surface2);
  color:var(--hint); font-weight:700; border:1px solid var(--border);
}
.chip.multi{ background: var(--accent-grad); color:#fff; border:none; }
.chip.warn{ background:var(--warn-bg); color:var(--warn); border:1px solid color-mix(in srgb, var(--warn) 35%, transparent); }

.qfigure{
  margin:0 0 14px; background:var(--glass); border:1px solid var(--border); border-radius:var(--radius);
  padding:10px; text-align:center; -webkit-backdrop-filter:blur(14px); backdrop-filter:blur(14px);
  box-shadow: var(--shadow-soft); animation: fadeUp .4s ease both;
}
.qfigure img{ max-width:100%; border-radius:12px; background:#fff; display:block; margin:0 auto; box-shadow: 0 4px 16px rgba(0,0,0,.15); }
.qfigure .figcap{ font-size:11.5px; color:var(--hint); margin-top:9px; font-weight:700; }
.qfigure.placeholder{ padding:20px; border:1.5px dashed var(--border); background:transparent; box-shadow:none; }

.qtext{ font-size:18.5px; font-weight:750; line-height:1.42; margin:0 0 18px; letter-spacing:-.2px; animation: fadeUp .45s ease both; animation-delay:.03s; }

.options{ display:flex; flex-direction:column; gap:9px; }
.opt{
  display:flex; align-items:flex-start; gap:12px; background:var(--glass); border:2px solid transparent;
  box-shadow: inset 0 0 0 1px var(--border);
  border-radius:16px; padding:14px 15px; cursor:pointer;
  -webkit-backdrop-filter:blur(14px); backdrop-filter:blur(14px);
  transition: border-color .15s ease, background .15s ease, transform .12s ease;
  animation: fadeUp .4s cubic-bezier(.16,1,.3,1) both;
}
.opt:nth-child(1){ animation-delay:.05s } .opt:nth-child(2){ animation-delay:.08s }
.opt:nth-child(3){ animation-delay:.11s } .opt:nth-child(4){ animation-delay:.14s }
.opt:nth-child(5){ animation-delay:.17s } .opt:nth-child(6){ animation-delay:.20s }
.opt:nth-child(7){ animation-delay:.23s } .opt:nth-child(8){ animation-delay:.26s }
.opt:nth-child(9){ animation-delay:.29s } .opt:nth-child(10){ animation-delay:.32s }
.opt:nth-child(11){ animation-delay:.35s } .opt:nth-child(12){ animation-delay:.38s }
@keyframes fadeUp{ from{ opacity:0; transform:translateY(8px); } to{ opacity:1; transform:translateY(0); } }

.opt:active{ transform:scale(.985); }
.opt .mark{
  flex:none; width:23px; height:23px; border-radius:50%; box-shadow: inset 0 0 0 2px var(--border);
  display:flex; align-items:center; justify-content:center; font-size:12px; margin-top:1px; color:transparent;
  transition: all .18s cubic-bezier(.34,1.56,.64,1);
}
.opt.multi .mark{ border-radius:7px; }
.opt .otext{ flex:1; font-size:14.5px; line-height:1.4; font-weight:500; }

.opt.selected{ border-color:var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--glass)); }
.opt.selected .mark{ background: var(--accent-grad); box-shadow:none; color:#fff; transform:scale(1.05); }

.opt.correct{ border-color:var(--ok); background:var(--ok-bg); box-shadow: 0 0 0 1px var(--ok), 0 6px 20px -6px color-mix(in srgb, var(--ok) 45%, transparent); }
.opt.correct .mark{ background:var(--ok); box-shadow:none; color:#06231a; animation: pop .3s cubic-bezier(.34,1.56,.64,1); }
.opt.wrong{ border-color:var(--bad); background:var(--bad-bg); box-shadow: 0 0 0 1px var(--bad), 0 6px 20px -6px color-mix(in srgb, var(--bad) 45%, transparent); }
.opt.wrong .mark{ background:var(--bad); box-shadow:none; color:#2a0a10; animation: pop .3s cubic-bezier(.34,1.56,.64,1); }
@keyframes pop{ 0%{ transform:scale(.5); } 70%{ transform:scale(1.2); } 100%{ transform:scale(1); } }
.opt.locked{ cursor:default; }

.explain{
  margin-top:16px; padding:14px 16px; border-radius:16px; font-size:14px; line-height:1.5; font-weight:600;
  animation: fadeUp .35s cubic-bezier(.16,1,.3,1) both;
}
.explain.ok{ background:var(--ok-bg); color:var(--ok); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ok) 30%, transparent); }
.explain.bad{ background:var(--bad-bg); color:var(--bad); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--bad) 30%, transparent); }
.explain b{ color:var(--text); }
.explain .warnnote{ display:block; margin-top:9px; color:var(--warn); font-size:12.5px; font-weight:700; }

.quiz-actions{
  padding:12px 16px; padding-bottom:calc(12px + env(safe-area-inset-bottom));
  background: var(--glass-strong); -webkit-backdrop-filter:blur(20px); backdrop-filter:blur(20px);
  border-top:1px solid var(--border); position:sticky; bottom:0;
}
.action-btn{
  width:100%; background:var(--accent-grad); color:#fff; border:none; border-radius:16px;
  padding:16px; font-size:16px; font-weight:800; font-family:var(--font); cursor:pointer;
  box-shadow: var(--shadow-glow); transition: transform .15s cubic-bezier(.34,1.56,.64,1), opacity .2s ease, box-shadow .2s ease;
  letter-spacing:.2px;
}
.action-btn:active{ transform:scale(.97); }
.action-btn:disabled{ opacity:.35; box-shadow:none; }
.action-btn.next{ background: linear-gradient(135deg, var(--ok), #22d3ee); box-shadow: 0 12px 34px -8px color-mix(in srgb, var(--ok) 55%, transparent); }

/* ============================================================
   RESULT
   ============================================================ */
#result{ align-items:center; justify-content:center; gap:22px; position:relative; }
.result-card{
  position:relative; background:var(--glass); border:1px solid var(--border); -webkit-backdrop-filter:blur(20px); backdrop-filter:blur(20px);
  border-radius:var(--radius-lg); padding:34px 24px 28px; text-align:center; width:100%; max-width:420px;
  box-shadow: var(--shadow-soft); overflow:hidden;
}
.result-card .dot{ position:absolute; width:8px; height:8px; border-radius:50%; opacity:.7; animation: floatDot 5s ease-in-out infinite; }
.result-card .d1{ top:14%; left:10%; background:var(--accent); animation-delay:0s; }
.result-card .d2{ top:20%; right:12%; background:var(--accent2); animation-delay:.6s; }
.result-card .d3{ bottom:22%; left:8%; background:var(--accent3); animation-delay:1.2s; }
.result-card .d4{ top:55%; right:6%; background:var(--ok); animation-delay:1.8s; width:6px;height:6px; }
.result-card .d5{ bottom:12%; right:22%; background:var(--warn); animation-delay:2.4s; width:5px;height:5px; }
.result-card .d6{ top:8%; left:40%; background:var(--accent2); animation-delay:3s; width:5px;height:5px; }
@keyframes floatDot{ 0%,100%{ transform:translateY(0) scale(1); } 50%{ transform:translateY(-10px) scale(1.3); } }

.res-emoji{ font-size:44px; animation: bounceIn .6s cubic-bezier(.34,1.56,.64,1) both; margin-bottom:6px; }
@keyframes bounceIn{ 0%{ transform:scale(.3); opacity:0; } 60%{ transform:scale(1.15); opacity:1; } 100%{ transform:scale(1); } }

.score-ring{
  --pct:0; width:160px; height:160px; border-radius:50%; margin:10px auto 18px; position:relative;
  background: conic-gradient(var(--accent-grad-ring, var(--accent)) calc(var(--pct)*1%), var(--border) 0);
  transition: background 1s cubic-bezier(.16,1,.3,1);
  box-shadow: var(--shadow-soft);
}
.score-ring::before{ content:''; position:absolute; inset:10px; border-radius:50%; background:var(--surface); box-shadow: inset 0 0 0 1px var(--border); }
.score-ring-inner{ position:relative; height:100%; display:flex; flex-direction:column; align-items:center; justify-content:center; gap:2px; }
.res-score{ font-size:34px; font-weight:800; }
.res-score span{ font-size:17px; color:var(--hint); font-weight:700; }
.res-pct{ font-size:12.5px; font-weight:800; color:var(--hint); letter-spacing:.3px; }

.score-ring.good{ --accent-grad-ring: linear-gradient(var(--ok), #22d3ee); }
.score-ring.good::before{ box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ok) 30%, transparent); }
.score-ring.good .res-pct{ color:var(--ok); }
.score-ring.mid{ --accent-grad-ring: linear-gradient(var(--warn), #ff9f43); }
.score-ring.mid .res-pct{ color:var(--warn); }
.score-ring.low{ --accent-grad-ring: linear-gradient(var(--bad), #ff5fae); }
.score-ring.low .res-pct{ color:var(--bad); }

.result-card h2{ margin:4px 0 8px; font-size:21px; font-weight:800; letter-spacing:-.3px; }
.res-sub{ color:var(--hint); font-size:13.5px; margin:0; font-weight:600; }

.result-actions{ width:100%; max-width:420px; display:flex; flex-direction:column; gap:10px; }
.result-actions .ghost-btn{ margin-top:0; }

/* ============================================================
   МОДУЛЬ «РАСЧЁТ РЕЖИМА» (formula-quiz.js)
   ============================================================ */
.fq{display:flex;flex-direction:column;gap:12px;padding-bottom:24px}
.fq-head{display:flex;align-items:center;gap:12px;margin:2px 0 2px}
.fq-head h2{margin:0;font-size:21px;font-weight:800;letter-spacing:-.3px}
.fq-lead{margin:0;color:var(--hint);font-size:13.5px;line-height:1.5}
.fq-muted{color:var(--hint);font-size:13px;line-height:1.45}
.fq-meta{color:var(--hint);font-size:11.5px;font-weight:700}
.fq-card{background:var(--glass);border:1px solid var(--border);border-radius:var(--radius);padding:14px 15px;
  display:flex;flex-direction:column;gap:8px;text-align:left;color:var(--text);font-family:var(--font);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);box-shadow:var(--shadow-soft)}
.fq-card p{margin:0}
.fq-test{cursor:pointer;width:100%;transition:transform .15s ease}
.fq-test:active{transform:scale(.985)}
.fq-test b{font-size:15.5px;font-weight:750}
.fq-spot{display:flex;justify-content:space-between;gap:10px;align-items:baseline}
.fq-spot-title{font-size:14px;font-weight:650}
.fq-spot-n{font-weight:800;color:var(--bad);font-variant-numeric:tabular-nums}
.fq-spot-desc{margin:-4px 0 4px}
.fq-seg{display:flex;gap:6px;flex-wrap:wrap}
.fq-seg-btn{flex:1;min-width:120px;background:var(--surface2);border:1px solid var(--border);color:var(--hint);font-family:var(--font);
  font-size:12.5px;font-weight:700;border-radius:12px;padding:9px 8px;cursor:pointer}
.fq-seg-btn.on{background:var(--accent-grad);color:#fff;border-color:transparent}
.fq-run-top{display:flex;align-items:center;gap:12px}
.fq-actions{display:flex;flex-direction:column;gap:9px;margin-top:6px}
.fq-input-row{display:flex;align-items:center;gap:10px}
.fq-input{flex:1;min-width:0;background:var(--surface2);border:2px solid var(--border);color:var(--text);border-radius:14px;
  padding:13px 14px;font-size:17px;font-family:var(--font);font-weight:650;outline:none}
.fq-input:focus{border-color:var(--accent)}
.fq-unit{color:var(--hint);font-weight:700;min-width:44px}
.fq-expl{margin-top:10px;font-weight:500;color:var(--text);font-size:13.5px}
.fq-order{display:flex;flex-direction:column;gap:8px}
.fq-order-row{display:flex;align-items:center;gap:10px;background:var(--glass);border:2px solid transparent;
  box-shadow:inset 0 0 0 1px var(--border);border-radius:14px;padding:10px 12px}
.fq-order-row.ok{border-color:var(--ok);background:var(--ok-bg)}
.fq-order-row.bad{border-color:var(--bad);background:var(--bad-bg)}
.fq-order-n{flex:none;width:24px;height:24px;border-radius:8px;background:var(--surface2);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:12px}
.fq-order-text{flex:1;font-size:14px}
.fq-score{align-items:center;text-align:center}
.fq-score-n{font-size:40px;font-weight:800;background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.tex{font-size:1.02em}
.tex-raw{font-family:ui-monospace,Menlo,monospace;font-size:.9em;color:var(--hint)}
.katex{font-size:1.05em}
.qtext .katex,.otext .katex{font-size:1em}

/* разбор задачи */
.fq-group{background:var(--glass);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.fq-group>summary{cursor:pointer;padding:13px 15px;font-weight:750;font-size:14.5px;list-style:none}
.fq-group>summary::-webkit-details-marker{display:none}
.fq-group>summary::before{content:'▸';display:inline-block;margin-right:8px;color:var(--accent2);transition:transform .15s}
.fq-group[open]>summary::before{transform:rotate(90deg)}
.fq-step{border-top:1px solid var(--border);padding:13px 15px;display:flex;flex-direction:column;gap:6px}
.fq-step-title{font-weight:750;font-size:14px}
.fq-formula{overflow-x:auto;overflow-y:hidden;padding:2px 0;text-align:left}
.fq-formula .katex-display{margin:.3em 0;text-align:left}
.fq-subst{color:var(--hint)}
.fq-step-result{font-size:15px}
.fq-why{margin:0;color:var(--hint);font-size:13px;line-height:1.5}
.fq-pitfall{margin:0;background:var(--warn-bg);color:var(--warn);border-radius:12px;padding:9px 11px;font-size:12.5px;font-weight:650;line-height:1.45}
.fq-check{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:4px}
.fq-check .fq-input{font-size:15px;padding:9px 12px;min-width:120px}
.fq-select{background:var(--surface2);color:var(--text);border:2px solid var(--border);border-radius:12px;padding:9px 10px;font-family:var(--font);font-size:14px}
.fq-check-btn{margin-top:0!important;width:auto!important;padding:9px 14px!important}
.fq-diag{flex-basis:100%;border-radius:12px;padding:10px 12px;font-size:13.5px;font-weight:600;display:flex;flex-direction:column;gap:6px;align-items:flex-start}
.fq-diag.ok{background:var(--ok-bg);color:var(--ok)}
.fq-diag.bad{background:var(--bad-bg);color:var(--bad)}
.fq-diag .fq-muted{font-weight:500}
.fq-diag .ghost-btn{margin-top:2px!important;width:auto!important;padding:8px 12px!important;font-size:12.5px!important}
.fq-link{background:none;border:none;color:var(--accent2);font-family:var(--font);font-weight:700;font-size:13px;cursor:pointer;text-align:left;padding:4px 0}
.fq-scroll-x{overflow-x:auto}
.fq-table{border-collapse:collapse;width:100%;font-size:12.5px;font-variant-numeric:tabular-nums}
.fq-table th,.fq-table td{padding:7px 8px;text-align:right;border-bottom:1px solid var(--border);white-space:nowrap}
.fq-table th:first-child,.fq-table td:first-child{text-align:left;font-weight:700;position:sticky;left:0}
.fq-table th{color:var(--hint);font-weight:800}

/* ============================================================
   Переключатель наборов (Тест 1 / Тест 2), варианты-картинки
   ============================================================ */
.ds-switch{display:flex;gap:4px;margin:14px 0 2px;padding:4px;background:var(--glass);border:1px solid var(--border);
  border-radius:16px;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.ds-btn{flex:1;border:none;background:transparent;color:var(--hint);font-family:var(--font);font-weight:800;font-size:14px;
  letter-spacing:.2px;padding:11px 8px;border-radius:12px;cursor:pointer;transition:background .2s ease,color .2s ease,transform .12s ease}
.ds-btn:active{transform:scale(.97)}
.ds-btn.on{background:var(--accent-grad);color:#fff;box-shadow:var(--shadow-glow)}
.opt-img{display:block;max-width:100%;height:auto;border-radius:8px;background:#fff;padding:6px;box-sizing:border-box}
.explain .opt-img{display:inline-block;max-width:260px;vertical-align:middle;margin-top:6px}
.qfigure img+img{margin-top:8px}
.otext sub,.otext sup,.qtext sub,.qtext sup,.explain sub,.explain sup{font-size:.72em;line-height:0}