/* ===== Calculate Everything — redesign / iOS-style design system ===== */

:root{
  /* tweakable tokens (set by Tweaks panel) */
  --accent: #9A6A28;
  --radius: 16px;
  --gap: 1;            /* density multiplier */
  --fs: 17px;          /* base font size */

  /* light theme (warm white / graphite) */
  --bg:        #F7F1E5;
  --bg-grad:   #EFE6D3;
  --surface:   #ffffff;
  --surface-2: #FCF8F0;
  --ink:       #211D16;
  --ink-2:     #6B6354;
  --ink-3:     #9A9182;
  --line:      rgba(28,26,22,.09);
  --line-2:    rgba(28,26,22,.06);
  --field:     #F1EAD9;
  --field-fg:  #211D16;
  --shadow:    0 1px 2px rgba(28,26,22,.05), 0 8px 24px rgba(28,26,22,.06);
  --shadow-sm: 0 1px 2px rgba(28,26,22,.06);
  --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
  --accent-ink:  var(--accent);
  --ok:  #3E7D55;
  --warn:#B07A1E;

  /* category hues */
  --c-school:  #6a5bd0;
  --c-physics: #2f74d0;
  --c-math:    #14a08a;
  --c-stats:   #d8843a;
  --c-econ:    #2e9457;
  --c-chem:    #c0577a;
  --c-it:      #3b7a8c;
  --c-health:  #d05b6a;
  --c-everyday:#6b7384;
  --c-construction:#b6792e;
  --c-cooking: #c25b46;
  --c-generators:#4a7d4e;
}

html[data-theme="dark"]{
  --bg:        #121211;
  --bg-grad:   #181715;
  --surface:   #1f1e1c;
  --surface-2: #262522;
  --ink:       #f3f1ec;
  --ink-2:     #a6a39c;
  --ink-3:     #74716a;
  --line:      rgba(255,253,247,.10);
  --line-2:    rgba(255,253,247,.06);
  --field:     #2b2a27;
  --field-fg:  #f3f1ec;
  --shadow:    0 1px 2px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.35);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --c-school:  #8d7eea;
  --c-physics: #5a96e6;
  --c-math:    #2bbfa6;
  --c-stats:   #e6a05a;
  --c-econ:    #4cb878;
  --c-chem:    #db7596;
  --c-it:      #5aa0b3;
  --c-health:  #e67885;
  --c-everyday:#9aa3b4;
  --c-construction:#d39a4f;
  --c-cooking: #e07a64;
  --c-generators:#5fa063;
}

h1,h2,h3,h4{ font-family:"Source Serif 4",Georgia,"Times New Roman",serif; font-weight:600; letter-spacing:-.01em; }
*{ box-sizing:border-box; -webkit-tap-highlight-color:transparent; }
html,body{ margin:0; height:100%; }

body{
  font-family:"Manrope",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,Roboto,sans-serif;
  font-size:var(--fs);
  color:var(--ink);
  background:
    radial-gradient(120% 80% at 50% -10%, var(--bg-grad), transparent 60%),
    var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
.mono{ font-family:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,monospace; font-feature-settings:"tnum" 1; }

/* ===== app shell : phone column ===== */
#app{ min-height:100dvh; }
.shell{
  position:relative;
  width:100%; max-width:480px;
  margin-inline:auto;
  min-height:100dvh;
  background:var(--bg);
  box-shadow:0 0 0 1px var(--line-2), 0 30px 80px -30px rgba(0,0,0,.25);
  display:flex; flex-direction:column;
  overflow:hidden;
}
@media (min-width:520px){
  body{ padding:0; }
  .shell{ min-height:100dvh; }
}

/* ===== top bar ===== */
.topbar{
  position:sticky; top:0; z-index:20;
  padding:calc(env(safe-area-inset-top) + 10px) 16px 10px;
  background:color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter:saturate(1.6) blur(18px);
  -webkit-backdrop-filter:saturate(1.6) blur(18px);
  border-bottom:1px solid var(--line-2);
  display:flex; align-items:center; gap:10px; min-height:52px;
}
.topbar.flush{ border-bottom-color:transparent; }
.tb-title{ font-size:1.06rem; font-weight:640; letter-spacing:-.01em; flex:1; min-width:0;
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
h1.tb-title{ font-family:inherit; margin:0; }
.tb-big{ font-size:1.72rem; font-weight:760; letter-spacing:-.025em; }
.iconbtn{
  flex:none; width:38px; height:38px; border-radius:50%;
  display:grid; place-items:center; border:none; cursor:pointer;
  background:var(--surface-2); color:var(--ink); box-shadow:var(--shadow-sm);
  transition:transform .12s, background .15s;
}
.iconbtn:active{ transform:scale(.92); }
.iconbtn svg{ width:20px; height:20px; }
.iconbtn.ghost{ background:transparent; box-shadow:none; color:var(--ink-2); }
.back{ color:var(--accent); font-weight:600; }

/* ===== scroll region ===== */
.scroll{ flex:1; overflow-y:auto; overflow-x:hidden; -webkit-overflow-scrolling:touch;
  padding-bottom:calc(env(safe-area-inset-bottom) + 92px); }
.page{ padding:6px 16px 0; }

/* ===== search ===== */
.search{
  display:flex; align-items:center; gap:8px;
  background:var(--field); border-radius:12px; padding:9px 12px; margin:6px 0 14px;
  color:var(--ink-3); border:1px solid transparent; transition:border-color .15s, background .15s;
}
.search:focus-within{ border-color:color-mix(in srgb,var(--accent) 55%, transparent); background:var(--surface); }
.search svg{ width:18px; height:18px; flex:none; }
.search input{
  border:none; outline:none; background:transparent; width:100%;
  font-size:1rem; color:var(--ink); font-family:inherit;
}
.search input::placeholder{ color:var(--ink-3); }
.search .clr{ border:none; background:var(--ink-3); color:var(--surface); width:18px;height:18px;
  border-radius:50%; display:grid;place-items:center; cursor:pointer; flex:none; font-size:11px; }

/* ===== section header ===== */
.sec{ display:flex; align-items:center; gap:10px; margin:22px 2px 10px; }
.sec .glyph{ width:26px;height:26px;font-size:14px; }
.sec h2{ font-size:.86rem; font-weight:700; letter-spacing:.02em; text-transform:uppercase;
  color:var(--ink-2); margin:0; flex:1; }
.sec .count{ font-size:.8rem; color:var(--ink-3); font-weight:600; }

/* category glyph (rounded app-icon square) */
.glyph{
  flex:none; display:grid; place-items:center; color:#fff; font-weight:680;
  border-radius:30%; width:30px; height:30px; font-size:15px; line-height:1;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.25);
}
.glyph.mono{ font-family:ui-monospace,monospace; }
.g-school{background:var(--c-school);} .g-physics{background:var(--c-physics);}
.g-math{background:var(--c-math);} .g-stats{background:var(--c-stats);}
.g-econ{background:var(--c-econ);} .g-everyday{background:var(--c-everyday);}
.g-chem{background:var(--c-chem);} .g-it{background:var(--c-it);} .g-health{background:var(--c-health);}
.g-construction{background:var(--c-construction);} .g-cooking{background:var(--c-cooking);} .g-generators{background:var(--c-generators);}

/* ===== list (iOS grouped) ===== */
.list{ background:var(--surface); border-radius:var(--radius); box-shadow:var(--shadow);
  overflow:hidden; }
.row{
  display:flex; align-items:center; gap:13px; width:100%;
  padding:calc(11px*var(--gap)) 14px; border:none; background:transparent;
  text-align:left; cursor:pointer; color:var(--ink); font-family:inherit;
  position:relative; transition:background .12s;
}
.row + .row::before{ content:""; position:absolute; left:57px; right:0; top:0; height:1px; background:var(--line); }
.row:active{ background:var(--surface-2); }
.row .glyph{ width:34px; height:34px; font-size:16px; border-radius:32%; }
.row .tx{ flex:1; min-width:0; }
.row .tx b{ display:-webkit-box; font-weight:560; font-size:1rem; letter-spacing:-.01em;
  white-space:normal; overflow:hidden; -webkit-line-clamp:2; -webkit-box-orient:vertical; }
.row .tx span{ display:block; font-size:.83rem; color:var(--ink-2); margin-top:1px;
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.row .chev{ color:var(--ink-3); flex:none; }
.row .chev svg{ width:18px;height:18px; display:block; }
.row .star{ flex:none; color:var(--accent); }
.row .ext{ flex:none; color:var(--ink-3); font-size:.9rem; }

/* favorite star button in rows */
.favbtn{ border:none; background:transparent; cursor:pointer;
  min-width:44px; min-height:44px; margin:-12px; display:grid; place-items:center;
  color:var(--ink-3); flex:none; }
.favbtn.on{ color:#e8b23a; }
.favbtn svg{ width:19px;height:19px; display:block; }

/* ===== home hero ===== */
.hero{ padding:8px 2px 2px; }
.hero h1{ font-size:1.9rem; font-weight:780; letter-spacing:-.03em; margin:2px 0 4px; }
.hero h1 em{ font-style:normal; color:var(--accent); }
.hero p{ color:var(--ink-2); font-size:.96rem; margin:0; line-height:1.45; }

/* quick chips */
.chips{ display:flex; gap:8px; overflow-x:auto; padding:14px 0 4px; margin:0 -16px; padding-inline:16px;
  scrollbar-width:none; }
.chips::-webkit-scrollbar{ display:none; }
.chip{ flex:none; display:flex; align-items:center; gap:7px; padding:8px 13px 8px 9px;
  background:var(--surface); border:1px solid var(--line); border-radius:999px; cursor:pointer;
  font-size:.9rem; font-weight:560; color:var(--ink); box-shadow:var(--shadow-sm); }
.chip:active{ transform:scale(.96); }
.chip .glyph{ width:22px;height:22px;font-size:11px; }

/* ===== empty / hint ===== */
.empty{ text-align:center; color:var(--ink-3); padding:54px 24px; }
.empty .big{ font-size:2.2rem; margin-bottom:8px; }
.muted{ color:var(--ink-2); font-size:.86rem; line-height:1.5; }
.subnote{ color:var(--ink-3); font-size:.8rem; padding:10px 4px 2px; }

/* ===== bottom tab bar ===== */
.tabbar{
  position:absolute; left:0; right:0; bottom:0; z-index:30;
  display:flex; padding:8px 10px calc(env(safe-area-inset-bottom) + 8px);
  background:color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter:saturate(1.6) blur(20px); -webkit-backdrop-filter:saturate(1.6) blur(20px);
  border-top:1px solid var(--line-2);
}
.tab{ flex:1; border:none; background:transparent; cursor:pointer; color:var(--ink-3);
  display:flex; flex-direction:column; align-items:center; gap:3px; padding:4px; font-family:inherit; }
.tab svg{ width:25px; height:25px; }
.tab span{ font-size:.66rem; font-weight:560; letter-spacing:.01em; }
.tab.on{ color:var(--accent); }
.tab:active{ transform:scale(.94); }

/* ===== calculator screen ===== */
.calc-head{ padding:10px 2px 2px; }
.calc-head .glyph{ width:46px;height:46px;font-size:22px; margin-bottom:12px; }
.calc-head h1{ font-size:1.5rem; font-weight:760; letter-spacing:-.025em; margin:0 0 4px; }
.calc-head p{ color:var(--ink-2); font-size:.95rem; margin:0; line-height:1.45; }
.formula{ display:inline-flex; margin-top:13px; padding:9px 13px; background:var(--surface);
  border:1px solid var(--line); border-radius:11px; font-size:1.02rem; color:var(--ink);
  box-shadow:var(--shadow-sm); }

.card{ background:var(--surface); border-radius:var(--radius); box-shadow:var(--shadow);
  margin-top:16px; overflow:hidden; }
.card-h{ font-size:.78rem; font-weight:700; letter-spacing:.04em; text-transform:uppercase;
  color:var(--ink-3); padding:14px 16px 2px; }

/* input field */
.field{ display:flex; align-items:center; gap:12px; padding:7px 16px; position:relative; }
.field + .field::before{ content:""; position:absolute; left:16px; right:16px; top:0; height:1px; background:var(--line); }
.field label{ font-size:.97rem; color:var(--ink); flex:none; width:42%; }
.field label small{ display:block; color:var(--ink-3); font-size:.76rem; font-weight:400; }
.field .inwrap{ flex:1; display:flex; align-items:center; justify-content:flex-end; gap:6px;
  background:var(--field); border:1px solid var(--line); border-radius:10px; padding:0 10px;
  transition:border-color .15s; }
.field .inwrap:focus-within{ border-color:color-mix(in srgb,var(--accent) 55%, transparent); }
.field input,.field select,.field textarea{
  font-family:inherit; font-size:1.06rem; color:var(--field-fg); background:transparent;
  border:none; outline:none; text-align:right; width:100%; min-width:0; padding:8px 0;
}
.field input::placeholder{ color:var(--ink-3); }
.field .unit{ color:var(--ink-3); font-size:.92rem; flex:none; }
.field select{ text-align:right; text-align-last:right; cursor:pointer; -webkit-appearance:none; appearance:none;
  color:var(--accent); font-weight:560; }
.field.col{ flex-direction:column; align-items:stretch; gap:6px; }
.field.col label{ width:auto; }
.field.col textarea{ text-align:left; min-height:64px; resize:vertical; background:var(--field);
  border-radius:10px; padding:10px 12px; line-height:1.5; }
.field.col input{ text-align:left; background:var(--field); border-radius:10px; padding:11px 12px; }
.field .seg-wrap{ flex:1; }

/* segmented control */
.seg{ display:flex; background:var(--field); border-radius:10px; padding:3px; gap:2px; }
.seg button{ flex:1; border:none; background:transparent; cursor:pointer; font-family:inherit;
  font-size:.86rem; font-weight:560; color:var(--ink-2); padding:7px 6px; border-radius:8px; transition:.15s;
  white-space:nowrap; }
.seg button.on{ background:var(--surface); color:var(--ink); box-shadow:var(--shadow-sm); }

/* result */
.result{ background:var(--surface); border-radius:var(--radius); box-shadow:var(--shadow);
  margin-top:16px; padding:18px 16px; }
.result.placeholder{ color:var(--ink-3); text-align:center; padding:30px 16px; font-size:.92rem; }
.res-main{ display:flex; align-items:flex-end; justify-content:space-between; gap:12px; }
.res-val{ font-size:2.3rem; font-weight:760; letter-spacing:-.03em; line-height:1.05; color:var(--ink); }
.res-val .u{ font-size:1.1rem; font-weight:600; color:var(--ink-2); margin-left:5px; }
.res-lbl{ font-size:.82rem; color:var(--ink-2); font-weight:560; margin-bottom:3px; }
/* длинные неразрывные значения (base64, UUID, hex, пароли) не распирают карточку */
.res-main > div:first-child{ min-width:0; flex:1 1 auto; }
.res-val, .res-lbl, .res-extra .v{ overflow-wrap:anywhere; }
.copybtn{ border:none; background:var(--accent-soft); color:var(--accent); cursor:pointer;
  border-radius:10px; padding:9px 11px; display:flex; align-items:center; gap:6px; font-weight:600;
  font-family:inherit; font-size:.86rem; flex:none; transition:.12s; }
.copybtn:active{ transform:scale(.94); }
.copybtn svg{ width:16px;height:16px; }
.res-extra{ display:grid; grid-template-columns:1fr 1fr; gap:1px; margin-top:16px;
  background:var(--line); border-radius:12px; overflow:hidden; }
.res-extra.one{ grid-template-columns:1fr; }
.res-extra .cell{ background:var(--surface); padding:11px 13px; }
.res-extra .cell .k{ font-size:.78rem; color:var(--ink-2); margin-bottom:2px; }
.res-extra .cell .v{ font-size:1.12rem; font-weight:640; letter-spacing:-.01em; }

/* steps disclosure */
.steps{ background:var(--surface); border-radius:var(--radius); box-shadow:var(--shadow); margin-top:16px; overflow:hidden; }
.steps-h{ display:flex; align-items:center; gap:10px; width:100%; border:none; background:transparent;
  padding:15px 16px; cursor:pointer; font-family:inherit; color:var(--ink); font-size:1rem; font-weight:560; }
.steps-h .ic{ flex:none; color:var(--accent); display:grid; place-items:center; }
.steps-h .ic svg{ width:20px; height:20px; display:block; }
.steps-h span{ white-space:nowrap; }
.steps-h .ar{ margin-left:auto; color:var(--ink-3); transition:transform .2s; }
.steps-h .ar svg{ width:18px; height:18px; display:block; }
.steps-h.open .ar{ transform:rotate(90deg); }
.steps-body{ padding:0 16px; overflow:hidden; }
.steps-body ol{ margin:0; padding:0 0 14px; list-style:none; counter-reset:s; }
.steps-body li{ counter-increment:s; position:relative; padding:9px 0 9px 34px; font-size:.95rem;
  line-height:1.5; border-top:1px solid var(--line); color:var(--ink); }
.steps-body li::before{ content:counter(s); position:absolute; left:0; top:9px; width:22px; height:22px;
  border-radius:50%; background:var(--accent-soft); color:var(--accent); font-size:.74rem; font-weight:700;
  display:grid; place-items:center; }
.steps-body li .fx{ font-family:ui-monospace,monospace; color:var(--ink); }
.steps-body li small{ display:block; color:var(--ink-2); font-size:.84rem; margin-top:2px; }

.explain{ padding:12px 4px 2px; color:var(--ink-2); font-size:.9rem; line-height:1.55; }
.explain b{ color:var(--ink); font-weight:600; }

/* Полная статья «теория за расчётом» (на страницах /calc/*.html) */
.app-article{ margin-top:20px; padding-top:16px; border-top:1px solid var(--line-2);
  color:var(--ink-2); font-size:.94rem; line-height:1.62; }
.app-article h2{ color:var(--ink); font-size:1.05rem; font-weight:740; letter-spacing:-.02em;
  margin:22px 0 8px; padding-left:2px; }
.app-article h2:first-child{ margin-top:0; }
.app-article h3{ color:var(--ink); font-size:.98rem; font-weight:680; margin:16px 0 6px; }
.app-article p{ margin:0 0 10px; }
.app-article b,.app-article strong{ color:var(--ink); font-weight:640; }
.app-article ul,.app-article ol{ margin:0 0 12px; padding-left:22px; }
.app-article li{ margin:3px 0; }
.app-article code{ font-family:ui-monospace,monospace; font-size:.86em; background:var(--field);
  color:var(--ink); padding:1px 5px; border-radius:6px; }
.app-article .eq{ display:inline-block; font-family:ui-monospace,monospace; color:var(--ink);
  background:var(--surface-2); border:1px solid var(--line); border-radius:8px;
  padding:3px 9px; margin:2px 0; }
.app-article table{ border-collapse:collapse; margin:6px 0 14px; font-size:.9rem; width:100%; }
.app-article th,.app-article td{ border:1px solid var(--line); padding:6px 10px; text-align:left; }
.app-article th{ background:var(--surface-2); color:var(--ink); font-weight:640; }
.app-article a{ color:var(--accent); text-decoration:none; font-weight:560; }
.app-article a:hover{ text-decoration:underline; }
.dt-content .app-article{ max-width:760px; }

/* FAQ — частые вопросы */
.faq{ margin-top:18px; }
.faq>h2{ font-size:1.05rem; font-weight:740; letter-spacing:-.02em; margin:0 0 8px; padding-left:6px; }
.faq-item{ border:1px solid var(--line); border-radius:14px; background:var(--surface); margin:8px 0; padding:2px 14px; }
.faq-item[open]{ background:var(--surface-2); }
.faq-q{ cursor:pointer; font-weight:600; padding:11px 0; color:var(--ink); list-style:none; font-size:.94rem; }
.faq-q::-webkit-details-marker{ display:none; }
.faq-q::before{ content:"＋"; color:var(--accent); margin-right:9px; font-weight:400; }
.faq-item[open] .faq-q::before{ content:"－"; }
.faq-a{ color:var(--ink-2); line-height:1.6; font-size:.9rem; padding:0 0 12px 24px; }
.faq-a p{ margin:0 0 8px; }

/* link-out card for external calcs */
.linkout{ display:flex; align-items:center; gap:8px; justify-content:center; margin-top:16px;
  background:var(--accent); color:#fff; border-radius:14px; padding:15px; font-weight:600;
  text-decoration:none; box-shadow:var(--shadow); }
.linkout:active{ transform:scale(.98); }

/* toast */
.toast{ position:fixed; left:50%; bottom:calc(env(safe-area-inset-bottom) + 104px); transform:translateX(-50%) translateY(10px);
  background:var(--ink); color:var(--bg); padding:11px 18px; border-radius:12px; font-size:.9rem; font-weight:560;
  box-shadow:0 10px 30px rgba(0,0,0,.3); opacity:0; pointer-events:none; transition:.22s; z-index:80;
  display:flex; align-items:center; gap:8px; }
.toast.show{ opacity:1; transform:translateX(-50%) translateY(0); }
.toast svg{ width:17px;height:17px; color:var(--ok); }

/* page transition */
.fadein{ animation:fadein .26s ease; }
@keyframes fadein{ from{ opacity:0; transform:translateY(6px); } to{ opacity:1; transform:none; } }

/* ===================== DESKTOP ===================== */
.dt-shell{ display:grid; grid-template-columns:296px minmax(0,1fr); min-height:100dvh; }
.dt-side{
  position:sticky; top:0; height:100dvh; overflow-y:auto;
  border-right:1px solid var(--line); background:var(--surface-2);
  padding:22px 16px; display:flex; flex-direction:column; gap:4px;
}
.dt-brand{ display:flex; align-items:center; gap:11px; font-size:1.28rem; font-weight:780;
  letter-spacing:-.03em; padding:4px 8px 16px; }
.dt-brand .mk{ width:30px; height:30px; border-radius:9px; background:var(--accent); color:#fff;
  display:grid; place-items:center; font-weight:800; font-size:18px; box-shadow:inset 0 1px 0 rgba(255,255,255,.3); }
.dt-search{ margin:0 0 12px; }
.dt-nav{ display:flex; flex-direction:column; gap:2px; }
.dt-navbtn{ display:flex; align-items:center; gap:11px; width:100%; padding:10px 11px; border:none;
  background:transparent; border-radius:10px; cursor:pointer; color:var(--ink); font-family:inherit;
  font-size:.97rem; font-weight:540; text-align:left; transition:background .14s; }
.dt-navbtn:hover{ background:var(--line-2); }
.dt-navbtn svg{ width:21px; height:21px; color:var(--ink-2); flex:none; }
.dt-navbtn span{ flex:1; }
.dt-navbtn .ct{ flex:none; font-size:.78rem; color:var(--ink-3); font-weight:600; }
.dt-navbtn.on{ background:var(--accent-soft); color:var(--accent); }
.dt-navbtn.on svg{ color:var(--accent); }

.dt-sidecats{ margin-top:16px; display:flex; flex-direction:column; gap:1px; }
.dt-sectitle{ font-size:.72rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase;
  color:var(--ink-3); padding:6px 11px 8px; }
.dt-catlink{ display:flex; align-items:center; gap:11px; width:100%; padding:8px 11px; border:none;
  background:transparent; border-radius:9px; cursor:pointer; color:var(--ink); font-family:inherit;
  font-size:.92rem; font-weight:500; text-align:left; transition:background .14s; }
.dt-catlink:hover{ background:var(--line-2); }
.dt-catlink .glyph{ width:24px; height:24px; font-size:12px; }
.dt-catlink .nm{ flex:1; }
.dt-catlink .ct{ flex:none; font-size:.78rem; color:var(--ink-3); font-weight:600; }
.dt-side-foot{ margin-top:auto; padding-top:12px; border-top:1px solid var(--line-2); }

.dt-main{ min-width:0; }
.dt-content{ padding:36px 44px 72px; max-width:1120px; }
.dt-h1{ font-size:2.15rem; font-weight:800; letter-spacing:-.03em; margin:0 0 6px; }
.dt-lead{ color:var(--ink-2); font-size:1.02rem; margin:0 0 8px; line-height:1.5; max-width:620px; }
.dt-content .sec{ margin:30px 2px 14px; }
.dt-content .sec h2{ font-size:.92rem; }
.dt-block:first-of-type .sec{ margin-top:18px; }

.dt-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(232px,1fr)); gap:13px; }
.card-calc{ position:relative; text-align:left; border:1px solid var(--line); background:var(--surface);
  border-radius:15px; padding:15px 16px 16px; cursor:pointer; display:flex; flex-direction:column; gap:9px;
  box-shadow:var(--shadow-sm); transition:transform .14s, box-shadow .14s, border-color .14s; font-family:inherit; color:var(--ink); }
.card-calc:hover{ transform:translateY(-2px); box-shadow:var(--shadow); border-color:color-mix(in srgb,var(--accent) 32%, var(--line)); }
.card-calc .cc-top{ display:flex; align-items:center; justify-content:space-between; }
.card-calc .glyph{ width:38px; height:38px; font-size:18px; border-radius:30%; }
.card-calc b{ font-size:1.04rem; font-weight:600; letter-spacing:-.01em; line-height:1.25; }
.card-calc > span{ font-size:.86rem; color:var(--ink-2); line-height:1.45; }
.card-calc .favbtn{ margin:-6px; }
.card-calc .ext{ color:var(--ink-3); }

.dt-back{ display:inline-flex; align-items:center; gap:4px; border:none; background:transparent; cursor:pointer;
  color:var(--accent); font-family:inherit; font-size:.95rem; font-weight:560; padding:0; margin-bottom:18px; }
.dt-back svg{ width:18px; height:18px; }
.dt-dhead{ display:flex; align-items:flex-start; gap:16px; }
.dt-dhead .glyph{ width:52px; height:52px; font-size:25px; border-radius:28%; }
.dt-dhead-tx{ flex:1; min-width:0; }
.dt-dhead-tx h1{ font-size:1.9rem; font-weight:780; letter-spacing:-.03em; margin:2px 0 5px; }
.dt-dhead-tx p{ color:var(--ink-2); font-size:1rem; margin:0; line-height:1.45; }
.dt-detail{ display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1.05fr); gap:22px; align-items:start; max-width:880px; margin-top:4px; }
.dt-col{ display:flex; flex-direction:column; gap:16px; min-width:0; }
.dt-col .card,.dt-col .result,.dt-col .steps{ margin-top:0; }
.dt-detail + .explain,.dt-col .explain{ padding-top:4px; }

@media (max-width:1080px){ .dt-detail{ grid-template-columns:1fr; max-width:560px; } }

/* ===================== MONETIZATION ===================== */
/* воронка на репетиторство — на предметных калькуляторах (tut:true) */
.app-cta{ margin-top:18px; background:var(--surface); border:1px solid var(--line);
  border-radius:var(--radius); box-shadow:var(--shadow); padding:18px 16px;
  position:relative; overflow:hidden; }
.app-cta::before{ content:""; position:absolute; inset:0 auto 0 0; width:4px; background:var(--accent); }
.app-cta .cta-h{ font-size:1.14rem; font-weight:740; letter-spacing:-.02em; margin-bottom:6px; padding-left:6px; }
.app-cta p{ color:var(--ink-2); font-size:.92rem; line-height:1.5; margin:0 0 14px; padding-left:6px; }
.app-cta .cta-btns{ display:flex; flex-wrap:wrap; gap:8px; padding-left:6px; }
.cta-btn{ display:inline-flex; align-items:center; gap:6px; padding:10px 14px; border-radius:11px;
  background:var(--surface-2); color:var(--ink); font-weight:560; font-size:.9rem; text-decoration:none;
  border:1px solid var(--line); box-shadow:var(--shadow-sm); transition:transform .12s, background .15s; }
.cta-btn:active{ transform:scale(.96); }
.cta-btn.primary{ background:var(--accent); color:#fff; border-color:transparent; }

/* футер: домен + кредит + кросс-ссылка на ЕГЭ-калькулятор */
.app-foot{ margin:26px 2px 6px; padding:16px 4px 6px; border-top:1px solid var(--line-2);
  color:var(--ink-3); font-size:.82rem; line-height:1.5; }
.app-foot p{ margin:0 0 4px; }
.app-foot a{ color:var(--accent); text-decoration:none; font-weight:560; }
.app-foot a:hover{ text-decoration:underline; }
.app-foot .foot-dom{ margin-top:8px; color:var(--ink-3); }
.app-foot .foot-dom a{ color:var(--ink-3); font-weight:600; }

.dt-content .app-cta,.dt-content .app-foot{ max-width:700px; }

@media (prefers-reduced-motion: reduce){ *{ animation:none !important; transition:none !important; } }