/* Learn Dialysis — styles (v2) */
:root{
  --bg:#f6f5f1; --surface:#ffffff; --surface2:#f1f3f2; --text:#14262b; --muted:#52666c; --faint:#74868b;
  --line:#e2e7e6; --brand:#0f3f4a; --brand-top:#155a66; --brand2:#0e7c86; --accent:#1b8f74; --accent-ink:#136b57; --accent-btn:#157d64; --coral:#e8705c;
  --fb:#c9303e; --fv:#8b1e3f; --fd:#1f7fb5; --fsp:#c58a1a; --fu:#2f8f5b; --fk:#7c5cbf; --fp:#d9622b; --fm:#1a8fa0; --fw:#3aa0d8; --fg:#9aa7b2; --fbt:rgba(201,48,62,.08); --fdt:rgba(31,127,181,.09);
  --d1:#0e7c86; --d2:#e8705c; --d3:#c58a1a; --d4:#5b6fb5; --tube-hi:rgba(255,255,255,.6); --skin:#e8c9a6; --fat:#f7ebd6; --cuff:#b9975b; --plasma:#d9ab3a; --hot-glow:rgba(27,143,116,.55);
  --ok:#177a42; --ok-bg:#e6f4ec; --bad:#b42318; --bad-bg:#fdecea; --warn:#b45309; --warn-bg:#fff3dc;
  --info-bg:#e6f1f1; --kp-bg:#ecf4f3; --kp-line:#cfe3e1; --mark:#ffe27a;
  --shadow:0 1px 2px rgba(15,27,45,.05),0 4px 16px rgba(15,27,45,.05); --shadow-lg:0 10px 30px rgba(8,18,35,.18);
  --radius:16px; --nav:#112f36; --nav-ink:#a9c3c8; --on-brand:#fff;
  --fs:1; --hdr-h:112px; --safe-t:env(safe-area-inset-top,0px); --safe-b:env(safe-area-inset-bottom,0px);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0c1719; --surface:#132124; --surface2:#192b2f; --text:#e6eeef; --muted:#a3b8bb; --faint:#74898d;
    --line:#233a3f; --brand:#0a1f24; --brand-top:#0f3238; --brand2:#5ec4cf; --accent:#4cc9a8; --accent-ink:#7fe0c6; --accent-btn:#15806a; --coral:#f08a78;
    --fb:#f0616e; --fv:#d4567f; --fd:#5fb0e8; --fsp:#e2b04a; --fu:#5cc98a; --fk:#a98ae6; --fp:#f08a55; --fm:#3fc3d6; --fw:#62bdf0; --fg:#6b7a88; --fbt:rgba(240,97,110,.12); --fdt:rgba(95,176,232,.12);
    --d1:#5ec4cf; --d2:#f08a78; --d3:#e2b04a; --d4:#8e9fe0; --tube-hi:rgba(255,255,255,.32); --skin:#b58f6e; --fat:#33291b; --cuff:#a98b58; --plasma:#d9ab3a; --hot-glow:rgba(76,201,168,.55);
    --ok:#4ade80; --ok-bg:#0f2a1c; --bad:#f87171; --bad-bg:#2d1416; --warn:#fbbf24; --warn-bg:#2b2010;
    --info-bg:#163338; --kp-bg:#122c31; --kp-line:#1f4a51; --mark:#6b5a12;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 6px 20px rgba(0,0,0,.25); --nav:#0f2a2f; --nav-ink:#9fbabe; --on-brand:#06181b; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0c1719; --surface:#132124; --surface2:#192b2f; --text:#e6eeef; --muted:#a3b8bb; --faint:#74898d;
  --line:#233a3f; --brand:#0a1f24; --brand-top:#0f3238; --brand2:#5ec4cf; --accent:#4cc9a8; --accent-ink:#7fe0c6; --accent-btn:#15806a; --coral:#f08a78;
  --fb:#f0616e; --fv:#d4567f; --fd:#5fb0e8; --fsp:#e2b04a; --fu:#5cc98a; --fk:#a98ae6; --fp:#f08a55; --fm:#3fc3d6; --fw:#62bdf0; --fg:#6b7a88; --fbt:rgba(240,97,110,.12); --fdt:rgba(95,176,232,.12);
    --d1:#5ec4cf; --d2:#f08a78; --d3:#e2b04a; --d4:#8e9fe0; --tube-hi:rgba(255,255,255,.32); --skin:#b58f6e; --fat:#33291b; --cuff:#a98b58; --plasma:#d9ab3a; --hot-glow:rgba(76,201,168,.55);
  --ok:#4ade80; --ok-bg:#0f2a1c; --bad:#f87171; --bad-bg:#2d1416; --warn:#fbbf24; --warn-bg:#2b2010;
  --info-bg:#163338; --kp-bg:#122c31; --kp-line:#1f4a51; --mark:#6b5a12;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 6px 20px rgba(0,0,0,.25); --nav:#0f2a2f; --nav-ink:#9fbabe; --on-brand:#06181b; color-scheme:dark;
}
*{box-sizing:border-box}
a,button,summary,input,select,textarea,.opt,.spot-row,.fc{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
input,select,textarea{font-size:max(16px,1em)}
details>summary{min-height:44px}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--hdr-h) + 60px)}
body{margin:0;background:var(--bg);color:var(--text);font:calc(16px * var(--fs))/1.6 -apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  padding-bottom:calc(98px + var(--safe-b));overflow-x:hidden;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;left:0;right:0;top:0;height:var(--safe-t);background:var(--brand-top);z-index:40}
/* the iOS bounce shows what lies behind the page: header colour above it, page colour below it */
html{background:var(--bg)}
body{min-height:100vh}
body::after{content:"";position:fixed;inset:0;z-index:-1;background:linear-gradient(var(--brand-top) 50%,var(--bg) 50%)}
.in-session::after{background:var(--bg)}
a{color:var(--brand2)}
button{font:inherit;color:inherit}
img,svg{max-width:100%}
svg{flex:0 0 auto}
.skip{position:absolute;left:-999px;top:0}
.skip:focus{left:8px;z-index:99;background:#fff;padding:8px;border-radius:8px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1:focus,#view:focus{outline:none}
[hidden]{display:none!important}

/* ---------- splash (shown once per session; CSS alone hides it after 2 s, so a script error can't leave it up) ---------- */
.splash{position:fixed;inset:0;z-index:100;display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:var(--safe-t) 24px var(--safe-b);color:#fff;text-align:center;
  background:radial-gradient(60% 45% at 50% 100%,rgba(232,112,92,.45) 0%,rgba(232,112,92,0) 70%),linear-gradient(180deg,#1a6a78 0%,#0f3f4a 55%,#0a2a31 100%);
  animation:splash-out .4s ease 2s forwards}
.splash-in{display:flex;flex-direction:column;align-items:center;animation:splash-rise .7s cubic-bezier(.2,.7,.2,1) both}
.splash img{width:96px;height:96px;border-radius:24px;box-shadow:0 12px 34px rgba(0,0,0,.35)}
.splash-t{margin-top:22px;font-size:1.9rem;font-weight:800;letter-spacing:-.025em}
.splash-s{margin-top:6px;font-size:1rem;color:rgba(255,255,255,.78)}
.splash-bar{position:absolute;left:50%;bottom:calc(var(--safe-b) + 56px);width:120px;height:3px;margin-left:-60px;border-radius:3px;background:rgba(255,255,255,.18);overflow:hidden}
.splash-bar i{display:block;height:100%;width:100%;background:#f3a596;border-radius:3px;transform-origin:left;animation:splash-fill 2s linear both}
@keyframes splash-rise{from{opacity:0;transform:translateY(10px) scale(.96)}to{opacity:1;transform:none}}
@keyframes splash-fill{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes splash-out{to{opacity:0;visibility:hidden}}
@media (prefers-reduced-motion:reduce){.splash-in,.splash-bar i{animation:none}.splash{animation-duration:.01s}}

/* ---------- header ---------- */
.top{position:sticky;top:0;z-index:30;color:#fff;background:linear-gradient(180deg,var(--brand-top) 0%,var(--brand) 100%);
  padding:calc(var(--safe-t) + 8px) 16px 12px;box-shadow:0 4px 18px rgba(8,24,45,.22);transition:transform .25s ease}
body.hdr-hidden .top{transform:translateY(-100%)}
.top-in{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:8px}
.brand{display:inline-flex;align-items:center;gap:9px;color:#fff;text-decoration:none;font-weight:700;font-size:1.06rem;letter-spacing:-.01em;align-self:flex-start;min-height:34px}
.brand img{border-radius:8px;box-shadow:0 2px 6px rgba(0,0,0,.25)}
.search{position:relative;flex:1}
.search input{width:100%;height:44px;border-radius:13px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.12);
  color:#fff;padding:0 42px;font-size:16px;outline:none;-webkit-appearance:none;appearance:none}
.search input::placeholder{color:rgba(255,255,255,.66)}
.search input:focus{background:rgba(255,255,255,.2);border-color:rgba(255,255,255,.45)}
.search input::-webkit-search-cancel-button{display:none}
.search-ic{position:absolute;left:13px;top:12px;width:20px;height:20px;color:rgba(255,255,255,.75)}
.search-x{position:absolute;right:5px;top:5px;width:34px;height:34px;border:0;border-radius:10px;background:rgba(255,255,255,.15);color:#fff;font-size:20px;line-height:1;cursor:pointer}
.top-in{position:relative}
.hdr-btn{position:absolute;top:0;right:0;width:36px;height:36px;display:grid;place-items:center;border-radius:11px;color:rgba(255,255,255,.88);background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16)}
.hdr-btn svg{width:20px;height:20px}
.hdr-btn:hover,.hdr-btn[aria-current]{background:rgba(255,255,255,.22);color:#fff}
.hdr-btn:focus-visible{outline:2px solid #fff;outline-offset:2px}
@media (min-width:720px){.top-in{flex-direction:row;align-items:center;gap:20px}.brand{align-self:center}.search{max-width:520px;margin-left:auto}.hdr-btn{position:static;flex:none;order:3}}

/* ---------- layout ---------- */
main{max-width:900px;margin:0 auto;padding:18px 16px 24px;outline:none}
.view-enter{animation:fade .18s ease-out}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.view-enter{animation:none}.top{transition:none}}
h1,h2,h3,h4{line-height:1.25;letter-spacing:-.015em}
h1{font-size:1.62rem;margin:.25em 0 .35em}
h2{font-size:1.2rem;margin:1.4em 0 .6em}
.sec-title{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin:28px 2px 10px}
.sec-title h2{margin:0;font-size:1.06rem}
.sec-title a,.link{font-size:.9rem;display:inline-flex;align-items:center;min-height:44px;margin:-12px 0;text-decoration:none;font-weight:600;color:var(--brand2);background:none;border:0;padding:0;cursor:pointer}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.center{text-align:center}
.mt{margin-top:14px}
.label{margin:14px 0 6px;font-weight:600}
.eyebrow{margin:0 0 4px;font-size:.76rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;opacity:.8}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.pad{padding:16px}
.grid{display:grid;gap:12px}
.grid>*{min-width:0}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:1fr}
@media (min-width:640px){.g3{grid-template-columns:repeat(3,minmax(0,1fr))}}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.center-row{justify-content:center}
.spacer{flex:1}
.head-row{margin-top:6px;align-items:baseline}
.head-row h1{margin:0}
/* title grows to fill the line, so a wrapped Save button sits under it on the left, not floating right */
.head-row h1{flex:1 1 auto}
.head-row .spacer{display:none}
.case-h1{margin:6px 0 4px}
.case-meta{margin-bottom:12px}
.case-meta p{margin:0}
.result-count{margin:0 0 10px}
.kbd{font-family:ui-monospace,monospace;font-size:.78rem;border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:0 5px}
@media (hover:none){.kbd-hint{display:none}}

/* ---------- buttons, chips, badges ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 16px;border-radius:12px;border:1px solid var(--line);
  background:var(--surface);color:var(--text);font-weight:600;text-decoration:none;cursor:pointer;font-size:.95rem;text-align:left}
.btn svg{width:18px;height:18px}
.btn:active{transform:scale(.98)}
.btn.primary{background:var(--brand2);border-color:var(--brand2);color:var(--on-brand)}
.btn.accent{background:var(--accent-btn);border-color:var(--accent-btn);color:#fff}
.btn.ghost{background:transparent}
.btn.danger{color:var(--bad)}
.btn.light{background:#fff;color:var(--brand);border:0}
.btn.ghost-light{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.2)}
.btn.sm{min-height:40px;padding:0 12px;font-size:.86rem;border-radius:10px}
.btn.wide{width:100%}
.btn[disabled]{opacity:.5;cursor:default}
.btn.on{border-color:var(--accent);color:var(--accent-ink);background:var(--info-bg)}
.chips{display:flex;gap:8px;overflow-x:auto;padding:2px 2px 8px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.chips::-webkit-scrollbar{display:none}
.chips.wrap{flex-wrap:wrap;overflow:visible}
.chips.pick{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;overflow:visible}
.chips.pick .chip{justify-content:space-between;align-items:center;border-radius:10px;padding:8px 10px;font-size:.82rem;min-width:0;white-space:normal;line-height:1.25;text-align:left}
@media (min-width:640px){.chips.pick{grid-template-columns:repeat(3,minmax(0,1fr))}}
.chip{flex:0 0 auto;display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:9px 14px;font-size:.86rem;font-weight:600;cursor:pointer;color:var(--muted);text-decoration:none;white-space:nowrap}
.chip svg{width:15px;height:15px}
.chip.on{background:var(--brand2);border-color:var(--brand2);color:var(--on-brand)}
.chip .n{opacity:.7;font-weight:500}
.badge{display:inline-block;font-size:.76rem;font-weight:700;letter-spacing:.03em;padding:2px 8px;border-radius:999px;background:var(--surface2);color:var(--muted);border:1px solid var(--line);text-transform:uppercase;vertical-align:middle}
.q-card>.badge{margin-bottom:10px}
.badge.new{background:var(--warn-bg);color:var(--warn);border-color:transparent}
:root[data-theme="dark"] :root[data-theme="dark"] @media (prefers-color-scheme:dark){:root:not([data-theme="light"]) :root:not([data-theme="light"]) }
.seg{display:inline-flex;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--surface)}
.seg button{border:0;background:none;padding:9px 14px;font-weight:600;font-size:.88rem;cursor:pointer;color:var(--muted);min-width:44px}
.seg button.on{background:var(--brand2);color:var(--on-brand)}

/* ---------- icon tiles ---------- */
.ti{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:color-mix(in srgb,var(--tc,var(--brand2)) 14%,var(--surface));color:var(--tc,var(--brand2));flex:0 0 auto}
.ti svg{width:20px;height:20px}
.ti.sm{width:32px;height:32px;border-radius:9px}
.ti.sm svg{width:17px;height:17px}
.ti.plain{background:none;color:var(--faint)}
.ti.ok{background:var(--ok-bg);color:var(--ok)}
.ti.bad{background:var(--bad-bg);color:var(--bad)}
.ti.big{width:56px;height:56px;border-radius:18px;margin:4px auto 2px}
.ti.big svg{width:28px;height:28px}
.mi{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;color:#fff;background:var(--c);flex:0 0 auto}
.mi svg{width:21px;height:21px}
.mi.sm{width:32px;height:32px;border-radius:9px}
.mi.sm svg{width:17px;height:17px}
.tile{display:flex;flex-direction:column;align-items:flex-start;gap:8px;padding:14px;border-radius:var(--radius);text-decoration:none;color:var(--text);background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow)}
.tile b{font-size:.95rem}
.tile>span:last-child{font-size:.8rem;color:var(--muted);line-height:1.4}
.tiles{margin-top:12px}

/* ---------- home ---------- */
.hero{position:relative;overflow:hidden;border-radius:22px;padding:22px;color:#fff;
  background:radial-gradient(70% 70% at 100% 100%,rgba(232,112,92,.55) 0%,rgba(232,112,92,0) 62%),linear-gradient(135deg,#1a6a78 0%,#0f3f4a 55%,#0a2a31 100%);box-shadow:var(--shadow)}
.hero h1{font-size:1.5rem;margin:0 0 8px;color:#fff;max-width:20ch}
.hero p{margin:0 0 16px;color:rgba(255,255,255,.84);max-width:46ch}
.hero .eyebrow{color:#fff}
.greet{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.greet h1{margin:0;flex:1}
.streak{display:inline-flex;align-items:center;gap:5px;padding:5px 11px;border-radius:999px;background:var(--warn-bg);color:var(--warn);font-weight:700;font-size:.84rem}
.streak svg{width:16px;height:16px}
.continue{display:flex;align-items:center;gap:14px;padding:16px;border-radius:20px;text-decoration:none;color:#fff;
  background:linear-gradient(135deg,var(--c) 0%,color-mix(in srgb,var(--c) 50%,#06121f) 100%);box-shadow:var(--shadow)}
.continue .mi{background:rgba(255,255,255,.18)}
.continue .tx{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.continue .tx b{font-size:1.1rem;line-height:1.3}
.continue .tx>span:not(.eyebrow){font-size:.82rem;opacity:.85}
.continue .bar{background:rgba(255,255,255,.25);--c:#fff;margin-top:8px}
.continue .go{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.18)}
.continue .go svg{width:20px;height:20px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}
.stats.four{grid-template-columns:repeat(2,1fr)}
@media (min-width:600px){.stats.four{grid-template-columns:repeat(4,1fr)}}
.stat{display:block;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px;text-align:center;text-decoration:none;color:var(--text);box-shadow:var(--shadow)}
.stat b{display:block;font-size:1.35rem;letter-spacing:-.02em;line-height:1.3}
.stat b small{font-size:.8rem;color:var(--faint);font-weight:600}
.stat span{font-size:.76rem;color:var(--muted)}
.banner{display:flex;align-items:center;gap:12px;padding:14px;text-decoration:none;color:var(--text)}
.banner .tx{flex:1;min-width:0}
.banner .tx b{display:block;font-size:.95rem}
.banner .tx span{font-size:.8rem;color:var(--muted)}
.hero-home{padding:30px 22px 28px}
.hero-home h1{font-size:1.7rem;max-width:16ch}
.home-gap{height:14px}
.qotd .tx span{display:block;line-height:1.45;margin-top:2px}
.home-line{margin:10px 2px 0;font-size:.86rem;color:var(--muted)}
.home-line a{color:var(--muted);text-decoration:none;font-weight:600}
.home-line a:first-child{color:var(--brand2)}
.bar{height:5px;border-radius:9px;background:var(--line);overflow:hidden;margin-top:auto}
.bar i{display:block;height:100%;background:var(--c,var(--accent));border-radius:9px;transition:width .3s}
.li .bar{margin-top:7px}

/* ---------- lists ---------- */
.list{display:flex;flex-direction:column}
.li{display:flex;align-items:center;gap:12px;padding:13px 14px;text-decoration:none;color:var(--text);border-top:1px solid var(--line);background:none;border-left:0;border-right:0;border-bottom:0;width:100%;text-align:left}
.li:first-child{border-top:0}
.li.static{cursor:default}
.li .tx{flex:1;min-width:0}
.li .tx b{display:block;font-weight:600;font-size:.95rem;line-height:1.35}
.li .tx>span{display:block;font-size:.8rem;color:var(--muted)}
.clamp{display:-webkit-box!important;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ck{width:26px;height:26px;border-radius:50%;border:2px solid var(--line);flex:0 0 auto;display:grid;place-items:center;font-size:.76rem;font-weight:800;color:var(--faint)}
.ck svg{width:13px;height:13px}
.ck.done{background:var(--ok);border-color:var(--ok);color:#fff}
.ck.bad{background:var(--bad);border-color:var(--bad);color:#fff}
.chev{color:var(--faint);width:18px;height:18px;flex:0 0 auto}
.crumb{font-size:.86rem;color:var(--muted);text-decoration:none;display:inline-flex;align-items:center;gap:4px;min-height:44px}
.crumb svg{width:15px;height:15px}

/* ---------- learn: module accordion ---------- */
.accs{display:flex;flex-direction:column;gap:10px;margin-top:6px}
details.acc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
details.acc>summary{display:flex;align-items:center;gap:12px;padding:14px;cursor:pointer;list-style:none}
details.acc>summary::-webkit-details-marker,details summary::-webkit-details-marker{display:none}
details.acc>summary .tx{flex:1;min-width:0}
details.acc>summary .tx b{display:block;font-size:.98rem}
details.acc>summary .tx>span{display:block;font-size:.8rem;color:var(--muted)}
details.acc>summary .bar{margin-top:7px}
.acc-ch{width:20px;height:20px;color:var(--faint);transition:transform .2s;flex:0 0 auto}
details[open]>summary .acc-ch{transform:rotate(180deg)}
details.acc .list{border-top:1px solid var(--line)}
.acc-foot{display:flex;gap:6px 16px;flex-wrap:wrap;padding:11px 14px;border-top:1px solid var(--line);background:var(--surface2)}
.acc-foot a{display:inline-flex;align-items:center;gap:5px;font-size:.86rem;font-weight:600;text-decoration:none}
.acc-foot svg{width:15px;height:15px}

/* ---------- module ---------- */
.mod-head{border-radius:22px;padding:20px;color:#fff;background:linear-gradient(135deg,var(--c) 0%,color-mix(in srgb,var(--c) 50%,#06121f) 100%);box-shadow:var(--shadow);margin-bottom:14px}
.mod-head h1{color:#fff;margin:2px 0 6px}
.mod-head p{margin:0;opacity:.9}
.mod-head .crumb{color:rgba(255,255,255,.82)}
.mod-head .eyebrow{margin-top:8px}
.mod-meta{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:.82rem;opacity:.9;margin:12px 0 8px}
.mod-head .bar{background:rgba(255,255,255,.25);margin-bottom:14px}

/* ---------- lesson ---------- */
.read-progress{position:fixed;left:0;right:0;top:var(--hdr-h);height:3px;z-index:29;pointer-events:none;transition:top .25s ease}
body.hdr-hidden .read-progress{top:var(--safe-t)}
.read-progress i{display:block;height:100%;width:0;background:var(--accent);border-radius:0 3px 3px 0}
.lesson-head h1{margin:6px 0 8px}
.meta{display:flex;gap:7px;flex-wrap:wrap;align-items:center;font-size:.83rem;color:var(--muted)}
.meta svg{width:15px;height:15px}
.meta .dot{width:4px;height:4px;border-radius:50%;background:var(--faint)}
.lesson-actions{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0 4px}
.kp{margin:14px 0 6px;padding:14px 16px;border-radius:16px;background:var(--kp-bg);border:1px solid var(--kp-line)}
.kp-h{display:flex;align-items:center;gap:7px;font-weight:800;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--brand2);margin-bottom:4px}
.kp-h svg{width:17px;height:17px}
.kp ul{margin:0;padding-left:1.15em}
.kp li{margin:.35em 0;font-size:.97rem}
.kp li::marker{color:var(--brand2)}
.resume{display:flex;align-items:center;gap:8px;width:100%;margin:10px 0 0;padding:11px 14px;border-radius:12px;border:1px dashed var(--accent);background:var(--surface);color:var(--accent-ink);font-weight:600;font-size:.9rem;cursor:pointer}
.resume svg{width:18px;height:18px}
.toc{position:sticky;top:var(--hdr-h);z-index:20;margin:10px -16px 4px;padding:8px 16px 2px;background:color-mix(in srgb,var(--bg) 97%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:top .25s ease}
body.hdr-hidden .toc{top:var(--safe-t)}
.toc .chip{padding:6px 12px;font-size:.82rem}
.deep-chip{color:var(--accent-ink)!important;border-color:color-mix(in srgb,var(--accent) 40%,var(--line))!important}
.deep-chip.on{background:var(--accent)!important;color:var(--on-brand)!important}
.prose{font-size:1.02rem}
.prose h3{font-size:1.16rem;margin:1.7em 0 .5em;padding-top:4px;color:var(--text);scroll-margin-top:calc(var(--hdr-h) + 60px)}
.prose h4{font-size:1rem;margin:1.2em 0 .4em}
.prose p{margin:.65em 0}
.prose ul,.prose ol{padding-left:1.25em;margin:.5em 0}
.prose li{margin:.3em 0}
.prose li::marker{color:var(--faint)}
.prose strong{font-weight:650}
.prose code{background:var(--surface2);border:1px solid var(--line);border-radius:6px;padding:1px 5px;font-size:.9em}
.prose a{text-decoration-thickness:1px;text-underline-offset:2px}
.gt{all:unset;cursor:pointer;color:inherit;border-bottom:1.5px dotted var(--brand2);line-height:1.2}
.gt:hover,.gt:focus-visible{background:var(--info-bg);border-radius:3px}
.gt:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.pop{position:fixed;z-index:60;width:min(320px,calc(100vw - 20px));padding:12px 14px;border-radius:14px;background:var(--surface);color:var(--text);border:1px solid var(--line);box-shadow:var(--shadow-lg);font-size:.9rem;animation:fade .12s ease-out}
.pop b{display:block;margin-bottom:2px}
.pop p{margin:0 0 8px;color:var(--muted);line-height:1.45}
.pop-links{display:flex;gap:6px 14px;flex-wrap:wrap;font-size:.84rem;font-weight:600}
.pop-links a{text-decoration:none}
.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88rem;background:var(--surface2);border:1px solid var(--line);border-radius:10px;padding:10px 12px;overflow-x:auto;white-space:nowrap}
.tbl-wrap{overflow-x:auto;margin:.8em 0;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:.88rem}
th,td{text-align:left;padding:9px 11px;border-top:1px solid var(--line);vertical-align:top}
thead th{border-top:0;background:var(--surface2);font-weight:700;font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}
.box{border-radius:14px;padding:12px 14px;margin:1em 0;border:1px solid var(--line);background:var(--surface)}
.box>:first-child{margin-top:0}.box>:last-child{margin-bottom:0}
.box .bt{display:flex;align-items:center;gap:7px;font-weight:750;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;margin-bottom:5px}
.box .bt svg{width:16px;height:16px}
.box ul{margin:.3em 0;padding-left:1.2em}
.box.key{background:var(--info-bg);border-color:transparent}.box.key .bt{color:var(--brand2)}
.box.tip{background:var(--ok-bg);border-color:transparent}.box.tip .bt{color:var(--ok)}
.box.warn{background:var(--bad-bg);border-color:transparent}.box.warn .bt{color:var(--bad)}
.box.ev{background:var(--warn-bg);border-color:transparent}.box.ev .bt{color:var(--warn)}
.box.uk{background:var(--surface2)}.box.uk .bt{color:var(--muted)}
.box.handbook{border-left:4px solid var(--accent)}.box.handbook .bt{color:var(--accent-ink)}
details.deep{border:1px solid var(--line);border-radius:14px;margin:1em 0;background:var(--surface)}
details.deep summary{cursor:pointer;padding:12px 14px;font-weight:650;list-style:none;display:flex;align-items:center;gap:8px}
details.deep summary::before{content:"+";display:grid;place-items:center;width:22px;height:22px;border-radius:7px;background:var(--surface2);color:var(--brand2);font-weight:800;flex:0 0 auto}
details.deep[open] summary::before{content:"–"}
details.deep>div{padding:0 14px 12px}
details.deep-sec{margin:26px 0 8px;border-radius:18px;border:1px solid color-mix(in srgb,var(--accent) 35%,var(--line));background:var(--surface);box-shadow:var(--shadow)}
details.deep-sec>summary{display:flex;align-items:center;gap:12px;padding:14px 16px;cursor:pointer;list-style:none;scroll-margin-top:calc(var(--hdr-h) + 60px)}
details.deep-sec>summary .ti{background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--accent-ink)}
details.deep-sec>summary .tx{flex:1;min-width:0}
details.deep-sec>summary .tx b{display:block;font-size:1rem}
details.deep-sec>summary .tx span{display:block;font-size:.8rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
details.deep-sec>.prose{padding:0 16px 14px;border-top:1px solid var(--line)}
details.deep-sec>.prose>h3:first-child{margin-top:1em}
details.notes{margin-top:22px;overflow:hidden}
details.notes>summary{display:flex;align-items:center;gap:10px;padding:13px 14px;cursor:pointer;list-style:none}
details.notes>summary svg:first-child{width:18px;height:18px;color:var(--brand2)}
details.notes>summary b{font-size:.95rem}
details.notes>summary .small{flex:1}
details.notes textarea{display:block;width:calc(100% - 28px);margin:0 14px 14px;min-height:110px;padding:10px 12px;border-radius:12px;border:1.5px solid var(--line);background:var(--surface2);color:var(--text);font:inherit;font-size:16px;resize:vertical}
details.notes textarea:focus{outline:none;border-color:var(--brand2)}
.terms-h{margin:14px 2px 6px}
mark,.hl{background:var(--mark);color:inherit;border-radius:3px;padding:0 1px}
.flash{animation:flash 1.6s ease-out}
@keyframes flash{0%{background:var(--mark)}100%{background:transparent}}
ol.stepper{list-style:none;padding:0;counter-reset:st}
ol.stepper>li{counter-increment:st;position:relative;padding:10px 12px 10px 46px;margin:8px 0;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
ol.stepper>li::before{content:counter(st);position:absolute;left:12px;top:10px;width:24px;height:24px;border-radius:50%;background:var(--brand2);color:var(--on-brand);font-size:.8rem;font-weight:800;display:grid;place-items:center}
ol.stepper>li.hidden{display:none}
.stepper-ctl{display:flex;gap:8px;margin:6px 0 14px}
.lesson-foot{margin-top:28px;display:flex;flex-direction:column;gap:12px}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.pn a{display:flex;flex-direction:column;gap:2px;padding:12px 14px;border-radius:14px;background:var(--surface);border:1px solid var(--line);text-decoration:none;color:var(--text);min-width:0}
.pn a span{font-size:.75rem;color:var(--muted)}
.pn a b{font-size:.88rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pn a.next{text-align:right}

/* ---------- practice ---------- */
.panel{margin-top:12px}
.panel-h{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.panel-h b{font-size:1.05rem}
.due-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}
.due-row>div{padding:10px 12px;border-radius:12px;background:var(--surface2);border:1px solid var(--line)}
.due-row .big{display:block;font-size:1.5rem;letter-spacing:-.02em;line-height:1.2}
.due-row span{font-size:.78rem;color:var(--muted)}
.q-card{padding:18px}
.q-card.stack{margin-bottom:10px}
.q-stem{font-weight:600;font-size:1.02rem;margin:0 0 12px}
.opts{display:flex;flex-direction:column;gap:8px}
.opt{display:flex;gap:10px;align-items:flex-start;text-align:left;width:100%;padding:12px 13px;border-radius:12px;border:1.5px solid var(--line);background:var(--surface);cursor:pointer;font-size:.95rem;line-height:1.45;min-height:48px}
.opt .l{flex:0 0 auto;width:24px;height:24px;border-radius:7px;background:var(--surface2);display:grid;place-items:center;font-weight:800;font-size:.78rem;color:var(--muted)}
@media (hover:hover){.opt:hover:not([disabled]){border-color:var(--brand2)}}
.opt.correct{border-color:var(--ok);background:var(--ok-bg)}
.opt.correct .l{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-bg)}
.opt.wrong .l{background:var(--bad);color:#fff}
.opt[disabled]{cursor:default}
.explain{margin-top:12px;padding:12px 14px;border-radius:12px;background:var(--surface2);font-size:.93rem;border-left:4px solid var(--brand2)}
.explain.ok{border-left-color:var(--ok)}.explain.bad{border-left-color:var(--bad)}
.progress-line{height:6px;border-radius:9px;background:var(--line);overflow:hidden;margin:8px 0 14px}
.progress-line i{display:block;height:100%;background:var(--accent);transition:width .25s}
.score-ring{width:120px;height:120px;margin:6px auto 10px;display:block}
details.review{border-top:1px solid var(--line)}
details.review:first-child{border-top:0}
details.review>summary{display:flex;gap:10px;align-items:center;padding:12px 14px;cursor:pointer;list-style:none}
details.review>summary .tx{flex:1;font-size:.93rem}
details.review .explain{margin:0 14px 14px}
.card-meta{margin:0}
.flash-wrap{perspective:1200px;margin:8px 0 14px}
.fc{position:relative;min-height:240px;cursor:pointer;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.7,.2,1)}
.fc.flipped{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:20px;padding:30px 22px 22px;display:flex;flex-direction:column;justify-content:center;
  background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);overflow:auto}
.fc-face.back{transform:rotateY(180deg);background:var(--surface2)}
.fc-face .lab{position:absolute;top:12px;left:16px;font-size:.76rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--faint)}
.fc-face .txt{font-size:1.12rem;font-weight:600;text-align:center}
.fc-face.back .txt{font-size:.98rem;font-weight:500;text-align:left}
@media (prefers-reduced-motion:reduce){.fc{transition:none}}
.fc-btns .btn{min-height:56px}
.fc-btns .btn span{display:flex;flex-direction:column;line-height:1.2}
.fc-btns small{font-weight:500;font-size:.74rem;opacity:.85}
.done-card h2{margin:6px 0}
.case-stage{padding:16px;margin-bottom:12px}
.case-stage .info{font-size:.96rem}
.case-stage .info p:first-child{margin-top:0}
.step-label{margin:0 0 4px;font-size:.76rem;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.case-stage .q-stem{margin-top:10px}
.vitals{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.vitals span{font-size:.8rem;padding:4px 9px;border-radius:8px;background:var(--surface2);border:1px solid var(--line);font-weight:600}

/* ---------- tools ---------- */
.calc{padding:16px}
.field{display:flex;flex-direction:column;gap:5px;margin-bottom:12px}
.field label{font-size:.84rem;font-weight:650;color:var(--muted)}
.field .inp{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:12px;background:var(--surface);overflow:hidden}
.field .inp>svg{width:18px;height:18px;margin-left:12px;color:var(--faint)}
.field .inp:focus-within{border-color:var(--brand2)}
.field input,.field select{flex:1;min-width:0;height:44px;border:0;background:transparent;padding:0 12px;font-size:16px;color:var(--text);outline:none}
.field .u{padding:0 12px;font-size:.82rem;color:var(--faint);white-space:nowrap}
.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 12px}
.fields .full{grid-column:1/-1}
.result{border-radius:14px;padding:14px 16px;background:var(--info-bg);margin-top:4px}
.result .big{font-size:1.6rem;font-weight:800;letter-spacing:-.02em}
.result .lbl{font-size:.8rem;color:var(--muted);font-weight:600}
.result.ok{background:var(--ok-bg)}.result.bad{background:var(--bad-bg)}.result.warn{background:var(--warn-bg)}
.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px}
.calc-note{font-size:.82rem;color:var(--muted);margin-top:12px}
.alarm{border-top:1px solid var(--line)}
.alarm:first-child{border-top:0}
.alarm summary{display:flex;gap:12px;align-items:center;padding:14px;cursor:pointer;list-style:none}
.alarm summary .tx{flex:1;min-width:0}
.alarm summary .tx b{display:block}
.alarm summary .tx span{display:block}
.alarm .ai{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:var(--warn-bg);color:var(--warn);flex:0 0 auto}
.alarm .ai svg{width:19px;height:19px}
.alarm .body{padding:0 14px 16px}
.alarm .body>p:first-child{margin-top:0}
.alarm h4{margin:12px 0 6px;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.alarm ul,.alarm ol{margin:0;padding-left:1.2em}
.alarm li{margin:4px 0;font-size:.94rem}
.circuit{padding:12px}
.circuit svg{width:100%;max-width:600px;height:auto;display:block;margin:0 auto;overflow:visible}
.circuit .hot{cursor:pointer}
.circuit .hot .hs{filter:drop-shadow(0 0 2.5px var(--hot-glow));transition:filter .2s}
.circuit .hot:hover .hs,.circuit .hot.sel .hs,.circuit .hot:focus-visible .hs{stroke:var(--accent);stroke-width:3;filter:drop-shadow(0 0 5px var(--hot-glow))}
.circuit.hint .hot .hs{animation:hotpulse 1.4s ease-in-out 3}
@keyframes hotpulse{50%{filter:drop-shadow(0 0 7px var(--hot-glow))}}
.circuit text{font-size:11px;fill:var(--text);font-weight:600;pointer-events:none;font-variant-numeric:tabular-nums}
.circuit text.md{font-size:9.5px}.circuit text.sm{font-size:9px}.circuit text.xs{font-size:8px}.circuit text.muted{fill:var(--muted);font-weight:500}
.circuit text.fx{font-size:8.5px;fill:var(--muted)}
.circuit text.reading{font-size:9px;fill:var(--muted);font-weight:700;transition:fill .3s}
.circuit text.reading.hi{fill:var(--bad)}
@media (max-width:600px){.circuit{margin:0 -16px;border-radius:0;border-left:0;border-right:0;padding:10px 2px}.circuit .legend,.circuit-info,.circ-play,.circ-alarm{margin-left:10px;margin-right:10px}.circuit .legend{margin-top:8px}}
.circuit .hot text{pointer-events:auto;cursor:pointer}
.circuit .flow{animation:dash 1.1s linear infinite}
@keyframes dash{from{stroke-dashoffset:13.2}to{stroke-dashoffset:0}}
.circuit .rot{transform-box:fill-box;transform-origin:center;animation:rot 1.6s linear infinite}
@keyframes rot{to{transform:rotate(360deg)}}
.circuit.stopped .rot,.circuit.stopped .flow{animation-play-state:paused}
.circuit .fx-el{opacity:0;transition:opacity .35s}
.circuit .fx-el.on{opacity:1}
.circuit.leak #cv-spent path:first-child{stroke:var(--fb)}
.circuit.bypass #cv-fresh,.circuit.bypass #cv-spent{opacity:.25;transition:opacity .4s}
@media (prefers-reduced-motion:reduce){.circuit .flow,.circuit .rot,.circuit.hint .hot .hs{animation:none}}
.circuit-info{margin-top:10px;padding:12px 14px;border-radius:12px;background:var(--surface2);min-height:80px}
.circuit-info h4{margin:0 0 4px}
.circ-play{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-top:10px;font-size:.8rem;color:var(--muted)}
.circ-play .chip{padding:5px 10px;font-size:.78rem}
.circ-alarm{margin-top:10px;padding:10px 12px;border-radius:12px;background:var(--surface2);border:1px solid var(--line);font-size:.86rem;transition:background .3s,border-color .3s}
.circ-alarm .an{font-weight:700;display:flex;gap:8px;align-items:center}
.circ-alarm .an .dot{width:9px;height:9px;border-radius:50%;background:var(--faint);flex:0 0 auto}
.circ-alarm.firing{background:var(--bad-bg);border-color:var(--bad)}
.circ-alarm.firing .an .dot{background:var(--bad);animation:blink .5s steps(2) infinite}
.circ-alarm.ok{background:var(--ok-bg);border-color:var(--ok)}
.circ-alarm.ok .an .dot{background:var(--ok)}
@keyframes blink{to{opacity:.15}}
.circ-alarm p{margin:4px 0 0;color:var(--muted)}
.circ-alarm .row{margin-top:8px;gap:6px;flex-wrap:wrap}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:.76rem;color:var(--muted);margin-top:6px}
.legend i{display:inline-block;width:18px;height:4px;border-radius:3px;vertical-align:middle;margin-right:5px}
.az{display:flex;flex-wrap:wrap;gap:4px;margin:4px 0 10px}
.az button{width:32px;height:32px;border-radius:9px;border:1px solid var(--line);background:var(--surface);font-weight:700;font-size:.82rem;color:var(--brand2);cursor:pointer}
.gl-letter{position:sticky;top:var(--hdr-h);background:var(--bg);padding:8px 2px 4px;font-weight:800;color:var(--brand2);z-index:2;transition:top .25s ease}
body.hdr-hidden .gl-letter{top:var(--safe-t)}
.gl{padding:12px 14px;border-top:1px solid var(--line);scroll-margin-top:calc(var(--hdr-h) + 50px)}
.gl:first-child{border-top:0}
.gl b{display:block}
.gl p{margin:3px 0 0;font-size:.9rem;color:var(--muted)}

/* ---------- search ---------- */
.sr{padding:13px 14px;border-top:1px solid var(--line)}
.sr:first-child{border-top:0}
.sr-main{display:block;text-decoration:none;color:var(--text)}
.sr .k{font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--accent-ink)}
.sr b{display:block;font-size:.97rem;margin:2px 0}
.sr .sub{font-size:.8rem;color:var(--muted)}
.sr p{margin:4px 0 0;font-size:.86rem;color:var(--muted);line-height:1.45}
.sr .also{display:block;margin-top:6px;font-size:.8rem;color:var(--faint)}
.sr .also a{font-weight:600;text-decoration:none}
.empty{text-align:center;padding:28px 16px;color:var(--muted)}
.empty svg{width:40px;height:40px;opacity:.5}

/* ---------- me & settings ---------- */
.week{margin-top:12px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.days{display:flex;gap:8px;margin-left:auto}
.day{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:.76rem;color:var(--faint);font-weight:700}
.day i{width:22px;height:22px;border-radius:7px;background:var(--surface2);border:1px solid var(--line)}
.day.on i{background:var(--accent);border-color:var(--accent)}
.settings{display:flex;flex-direction:column;gap:14px}
.set-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.set-row>span{font-weight:600;font-size:.93rem}
.set-row small{display:block;font-weight:400;font-size:.78rem;color:var(--muted)}

/* ---------- tab bar ---------- */
.tabbar{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(10px + var(--safe-b));z-index:35;display:flex;gap:2px;padding:6px;border-radius:999px;
  background:var(--nav);box-shadow:0 10px 30px rgba(8,18,35,.35);width:min(520px,calc(100% - 24px))}
.tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:7px 2px 6px;border-radius:999px;color:var(--nav-ink);text-decoration:none;font-size:.7rem;font-weight:600}
.tabbar a svg{width:22px;height:22px}
.tabbar a.on{background:rgba(255,255,255,.14);color:#fff}
@media (min-width:1120px){
  body{padding-bottom:40px}
  .tabbar{left:max(16px,calc(50% - 450px - 110px));top:50%;bottom:auto;transform:translateY(-50%);flex-direction:column;width:78px;border-radius:26px;padding:8px}
  .tabbar a{padding:10px 2px;border-radius:18px}
}
.toast{position:fixed;left:50%;bottom:calc(92px + var(--safe-b));transform:translate(-50%,20px);opacity:0;pointer-events:none;display:flex;align-items:center;gap:12px;
  background:#111c2e;color:#fff;padding:10px 12px 10px 16px;border-radius:14px;font-size:.88rem;font-weight:600;transition:.25s;z-index:50;box-shadow:0 8px 24px rgba(0,0,0,.25);max-width:calc(100% - 32px)}
.toast.show{opacity:1;transform:translate(-50%,0);pointer-events:auto}
.toast button{border:0;background:rgba(255,255,255,.14);color:#7fe3df;font-weight:700;border-radius:9px;padding:6px 10px;cursor:pointer;white-space:nowrap}
@media (min-width:1120px){.toast{bottom:28px}}
.foot-note{font-size:.76rem;color:var(--faint);text-align:center;margin:30px 8px 8px;line-height:1.5}
.foot-by{font-size:.84rem;color:var(--muted)}.foot-by b{font-weight:650}
@media (min-width:700px){
  .hero{padding:30px}
  .hero h1{font-size:1.85rem}
}
@media print{.top,.tabbar,.toc,.lesson-foot,.toast,.read-progress,.lesson-actions,details.notes{display:none!important}body{padding:0}details.deep-sec>.prose{display:block!important}}

/* ---------- animated diagrams (js/figures.js) ---------- */
.fig{position:relative;margin:18px 0;padding:12px 12px 10px}
.fig-art svg{display:block;width:100%;height:auto;max-width:560px;margin:0 auto;overflow:visible}
.fig-art text{font-family:inherit}
.fig-art text{font-variant-numeric:tabular-nums}
.fig .ft{font-size:10px;fill:var(--text)}
.fig .fs{font-size:9.5px;fill:var(--muted)}
.fig .fx{font-size:8.8px;fill:var(--muted)}
.fig .fh{font-size:10.5px;font-weight:700;fill:var(--text)}
.fig .fw{fill:#fff}
.fig .sm{font-size:9.5px}
.fig .bad{fill:var(--bad)}.fig .ok{fill:var(--ok)}
.fig .lbl,.circuit .lbl{paint-order:stroke;stroke:var(--surface);stroke-width:3px;stroke-linejoin:round}
.fig figcaption{font-size:.86rem;line-height:1.5;color:var(--muted);margin-top:8px;padding-right:34px}
.fig.static figcaption{padding-right:0}
.fig figcaption b{color:var(--text)}
.fig-pp{position:absolute;right:6px;bottom:6px;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--muted);display:grid;place-items:center;cursor:pointer;padding:0}
.fig-pp svg{width:14px;height:14px}
.fig.paused .fig-pp{color:var(--brand2);border-color:var(--brand2)}
.fig-steps{display:flex;align-items:center;gap:6px;margin-top:10px;padding-top:8px;border-top:1px solid var(--line)}
.fig-steps .st{flex:1;min-width:0;font-size:.82rem;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fig-sb{width:32px;height:32px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--muted);display:grid;place-items:center;cursor:pointer;padding:0;flex:0 0 auto}
.fig-sb svg{width:14px;height:14px}
.fig.stepped .fig-pp{position:static;margin-left:4px}
.fig.stepped figcaption{padding-right:0}
.fig-gallery .fig{margin:0 0 14px}

/* ---------- landmark trials (v2.2): a separate, clearly marked panel under the lesson text, and the Tools gallery ---------- */
details.trials-sec{border-color:color-mix(in srgb,var(--warn) 45%,var(--line))}
details.trials-sec>summary .ti{background:var(--warn-bg);color:var(--warn)}
.trial-chip{color:var(--warn)!important;border-color:color-mix(in srgb,var(--warn) 45%,var(--line))!important}
.trials-body{padding:0 12px 12px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:10px}
.trials-body.gallery{padding:0;border:0}
.trial{border-radius:14px;border:1px solid var(--line);border-left:4px solid var(--warn);background:var(--surface);padding:12px 14px;scroll-margin-top:calc(var(--hdr-h) + 60px)}
.trials-body>.trial:first-child{margin-top:12px}
.trials-body.gallery>.trial:first-child{margin-top:0}
.trial-h{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.trial-h b{font-size:1rem;line-height:1.25}
.trial-yr{flex:0 0 auto;font-size:.74rem;font-weight:800;letter-spacing:.04em;padding:3px 8px;border-radius:999px;background:var(--warn-bg);color:var(--warn)}
.trial-meta{margin:4px 0 8px;font-size:.82rem;color:var(--muted)}
.trial dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:4px 10px;font-size:.92rem}
.trial dt{font-weight:800;font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;color:var(--warn);padding-top:3px}
.trial dd{margin:0;line-height:1.5}
.trial-link{display:inline-flex;align-items:center;gap:4px;margin-top:10px;font-size:.86rem;font-weight:600;color:var(--brand2);text-decoration:none}
.trial-link .chev{width:16px;height:16px}
.trial-all{display:flex;align-items:center;justify-content:center;gap:4px;padding:10px;font-weight:600;font-size:.9rem;color:var(--brand2);text-decoration:none}
.trial-all svg{width:16px;height:16px}
.trial.flash{animation:trialFlash 1.6s ease-out}
@keyframes trialFlash{0%{background:var(--warn-bg)}100%{background:var(--surface)}}
@media print{details.trials-sec>.trials-body{display:flex!important}}

/* ---------- drugs on dialysis (v2.2) ---------- */
.drug-q{display:block;width:100%;margin:12px 0 4px;padding:11px 14px;border-radius:12px;border:1.5px solid var(--line);background:var(--surface);color:var(--text);font:inherit;font-size:1rem}
.drug-q:focus{outline:none;border-color:var(--brand2)}
.drug-key{display:flex;align-items:center;gap:8px;margin:8px 0 0}
.drug-list{display:flex;flex-direction:column;gap:8px;margin:6px 0 14px}
details.drug{border-radius:14px;border:1px solid var(--line);background:var(--surface);scroll-margin-top:calc(var(--hdr-h) + 16px)}
details.drug>summary{display:flex;align-items:center;gap:10px;padding:12px 14px;cursor:pointer;list-style:none}
details.drug>summary::-webkit-details-marker{display:none}
details.drug>summary .acc-ch{width:18px;height:18px;flex:0 0 auto;color:var(--faint);transition:transform .2s}
details.drug[open]>summary .acc-ch{transform:rotate(180deg)}
.drug-n{flex:1;min-width:0;display:flex;flex-direction:column}
.drug-n b{font-size:.98rem;line-height:1.3}
.drug-c{font-size:.78rem;color:var(--muted)}
.rem{flex:0 0 auto;font-size:.72rem;font-weight:750;padding:3px 8px;border-radius:999px;white-space:nowrap}
.rem-yes{background:var(--info-bg);color:var(--brand2)}
.rem-part{background:var(--warn-bg);color:var(--warn)}
.rem-no{background:var(--surface2);color:var(--muted)}
.rem-unk{background:var(--surface2);color:var(--faint)}
details.drug dl{margin:0;padding:0 14px 14px;display:grid;grid-template-columns:auto 1fr;gap:6px 12px;font-size:.92rem;border-top:1px solid var(--line);padding-top:12px}
details.drug dt{font-weight:800;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--brand2);padding-top:3px;max-width:6.5em}
details.drug dd{margin:0;line-height:1.5}
details.drug.flash{animation:trialFlash 1.6s ease-out}
.li.ext .tx span{white-space:normal}
.li.ext .chev{width:16px;height:16px;color:var(--faint)}

/* native (iOS/Android) build: see native/native.js */
html:not(.native) .native-only,.no-reminders .remind-row{display:none!important}
.inp.time input[type=time]{font:inherit;font-size:.95rem;padding:8px 10px;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--text);min-height:40px}
.release h2{font-size:1.15rem;margin:0}
.release ul{margin:10px 0 0;padding-left:20px}
.release li{margin:6px 0}
.release.current{border-color:var(--accent)}
.opt.picked{border-color:var(--brand2);background:var(--surface2)}
.report-line{margin:16px 0 4px}
.report-line a{display:inline-flex;align-items:center;gap:6px;color:var(--muted);text-decoration:none;min-height:44px}
.report-line svg{width:15px;height:15px}
/* practice home */
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.pr-hero{padding:18px 16px 14px;margin:0 0 14px}
.pr-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}
.pr-hero h1{margin:0}
.pr-streak{display:inline-flex;align-items:center;gap:5px;padding:5px 11px;border-radius:999px;background:rgba(255,255,255,.14);font-weight:700;font-size:.82rem}
.pr-streak svg{width:15px;height:15px;color:#ffc27a}
.pr-next{display:flex;align-items:center;gap:12px;padding:14px;border-radius:18px;background:#fff;color:#14262b;text-decoration:none;box-shadow:0 8px 22px rgba(4,24,30,.28);transition:transform .15s}
.pr-next:active{transform:scale(.98)}
.pr-next-ic{flex:0 0 46px;height:46px;border-radius:14px;display:grid;place-items:center;background:#e6f1f1;color:#0e7c86}
.pr-next-ic svg{width:24px;height:24px}
.pr-next .tx{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}
.pr-next .eyebrow{font-size:.76rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:#0e7c86;margin:0}
.pr-next b{font-size:1.04rem;line-height:1.25}
.pr-next .tx>span:last-child{font-size:.82rem;color:#52666c}
.pr-go{flex:0 0 34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#0e7c86;color:#fff}
.pr-go svg{width:18px;height:18px}
.pr-stats{display:grid;grid-template-columns:repeat(3,1fr);margin-top:14px}
.pr-stats a{display:flex;flex-direction:column;align-items:center;color:#fff;text-decoration:none;padding:4px 2px;min-height:44px}
.pr-stats a+a{border-left:1px solid rgba(255,255,255,.16)}
.pr-stats b{font-size:1.32rem;letter-spacing:-.02em;line-height:1.2}
.pr-stats span{font-size:.76rem;color:rgba(255,255,255,.78)}
.pr-week{display:flex;justify-content:space-between;margin-top:12px;padding-top:10px;border-top:1px solid rgba(255,255,255,.14)}
.pr-week span{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:.76rem;font-weight:600;color:rgba(255,255,255,.66)}
.pr-week i{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.2)}
.pr-week .on i{background:#ffc27a;box-shadow:0 0 0 3px rgba(255,194,122,.2)}
.modes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
@media (min-width:720px){.modes{grid-template-columns:repeat(4,minmax(0,1fr))}}
.mode,.drill{position:relative;display:flex;flex-direction:column;gap:2px;overflow:hidden;padding:14px;border-radius:18px;text-decoration:none;color:var(--text);background:color-mix(in srgb,var(--tc) 11%,var(--surface));border:1px solid color-mix(in srgb,var(--tc) 22%,var(--line));transition:transform .15s}
.mode:active,.drill:active,.topic:active{transform:scale(.97)}
.mode-ic{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:var(--tc);color:#fff;margin-bottom:8px}
.mode-ic svg{width:20px;height:20px}
.mode-t{font-size:.8rem;font-weight:700;color:var(--muted)}
.mode b{font-size:1.72rem;letter-spacing:-.02em;line-height:1.15}
.mode b small{font-size:.95rem;font-weight:600;color:var(--muted)}
.mode-s{font-size:.77rem;color:var(--muted);line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.mode-bar{height:5px;border-radius:9px;background:color-mix(in srgb,var(--tc) 18%,transparent);margin-top:8px;overflow:hidden}
.mode-bar i{display:block;height:100%;background:var(--tc);border-radius:9px}
.scroller{display:flex;gap:10px;overflow-x:auto;scroll-snap-type:x proximity;margin:0 -16px;padding:2px 16px 8px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.scroller::-webkit-scrollbar{display:none}
.scroller>*{flex:0 0 auto;scroll-snap-align:center}
.drill{width:164px;min-height:164px}
.drill b{font-size:.96rem;line-height:1.2}
.drill>span:not(.mode-ic){font-size:.77rem;color:var(--muted);line-height:1.3;margin-top:2px}
.drill em{margin-top:auto;padding-top:8px;font-style:normal;font-size:.76rem;font-weight:700;color:color-mix(in srgb,var(--tc) 72%,var(--text))}
.topic{width:124px;display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 8px;border-radius:16px;background:var(--surface);border:1px solid var(--line);text-decoration:none;color:var(--text);text-align:center;transition:transform .15s}
.topic b{font-size:.78rem;line-height:1.2;min-height:2.4em}
.topic>span:last-child{font-size:.76rem;color:var(--muted)}
.topic .mi{width:58px;height:58px}
.big-btn{min-height:54px;font-size:1.02rem;border-radius:14px;margin-top:14px}
.topic-pick{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
@media (min-width:640px){.topic-pick{grid-template-columns:repeat(3,minmax(0,1fr))}}
.tp{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:54px;padding:8px 12px;border-radius:12px;border:1.5px solid var(--line);border-left:4px solid var(--c,var(--brand2));background:var(--surface);color:var(--text);font:inherit;text-align:left;cursor:pointer}
.tp b{font-size:.84rem;line-height:1.2;font-weight:650}
.tp span{font-size:.76rem;color:var(--muted)}
.tp.on{border-color:var(--brand2);background:var(--info-bg)}
.wide-seg{display:flex}
.wide-seg button{flex:1;min-height:46px}
.switch-row{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;margin-top:14px;padding:12px 14px;border-radius:14px;border:1px solid var(--line);background:var(--surface);color:var(--text);font:inherit;text-align:left;cursor:pointer}
.switch-row .tx{display:flex;flex-direction:column}
.switch-row .tx span{font-size:.8rem;color:var(--muted)}
.switch{flex:0 0 46px;height:28px;border-radius:999px;background:var(--line);position:relative;transition:background .2s}
.switch::after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.3);transition:transform .2s}
.switch-row.on .switch{background:var(--brand2)}
.switch-row.on .switch::after{transform:translateX(18px)}
/* home: course front page. One typeface, no decoration, colour only where it carries meaning */
.therapy{display:flex;gap:10px;margin-bottom:10px}
.therapy a{flex:1 1 0;min-width:0;display:flex;flex-direction:column;gap:10px;padding:13px 14px;border-radius:16px;background:var(--surface);border:1px solid var(--line);color:var(--text);text-decoration:none;transition:transform .14s}
.therapy .ic{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;color:#fff}
.therapy .ic svg{width:19px;height:19px}
.therapy b{font-size:.98rem;line-height:1.15}
.therapy a:active{transform:scale(.97)}
@media (prefers-reduced-motion:reduce){.therapy a{transition:none}}
.pr-line{margin:-6px 0 14px}
.pr-up{display:flex;flex-direction:column;gap:3px;padding:16px 16px 14px;border-radius:16px;background:var(--brand);color:#fff;text-decoration:none;box-shadow:var(--shadow);transition:transform .14s}
.pr-up .eyebrow{color:rgba(255,255,255,.72)}
.pr-up b{font-size:1.25rem;line-height:1.2;letter-spacing:-.015em}
.pr-up>span:not(.eyebrow):not(.pr-start){font-size:.86rem;color:rgba(255,255,255,.82)}
.pr-start{display:inline-flex;align-items:center;gap:2px;align-self:flex-start;margin-top:12px;min-height:38px;padding:0 10px 0 16px;border-radius:999px;background:#fff;color:#0f3f4a;font-size:.88rem;font-weight:700}
.pr-start svg{width:16px;height:16px}
.pr-up:active{transform:scale(.985)}
@media (prefers-reduced-motion:reduce){.pr-up{transition:none}}
/* session screens */
.in-session .top,.in-session .tabbar{display:none}
.in-session main{padding-top:calc(8px + var(--safe-t));padding-bottom:calc(120px + var(--safe-b));max-width:680px}
.sess-bar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;margin:0 -16px 12px;padding:8px 16px;padding-top:calc(8px + var(--safe-t));background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.sess-x{flex:0 0 40px;height:40px;border-radius:50%;display:grid;place-items:center;color:var(--muted);text-decoration:none;background:var(--surface2)}
.sess-x svg{width:18px;height:18px}
.sess-n{font-size:.8rem;font-weight:700;color:var(--muted);font-variant-numeric:tabular-nums}
.pips{flex:1;display:flex;gap:4px}
.pips i{flex:1;height:7px;border-radius:9px;background:var(--line);transition:background .2s}
.pips i.cur{background:color-mix(in srgb,var(--brand2) 40%,var(--line))}
.pips i.done{background:var(--brand2)}
.pips i.ok{background:var(--ok)}
.pips i.bad{background:var(--bad)}
.sess-bar .progress-line{flex:1;margin:0}
.sess-foot{position:fixed;left:0;right:0;bottom:0;z-index:40;padding:12px 16px calc(12px + var(--safe-b));background:var(--surface);border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(8,18,35,.1);animation:foot-up .22s ease-out}
.sess-foot.ok{background:var(--ok-bg);border-top-color:var(--ok)}
.sess-foot.bad{background:var(--bad-bg);border-top-color:var(--bad)}
.sess-foot-in{max-width:648px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px}
.sess-foot-in .fc-btns{flex:1;margin:0}
.sess-foot .btn.primary{min-height:50px;padding:0 22px;border-radius:14px;font-size:1rem}
.verdict{display:inline-flex;align-items:center;gap:8px;font-weight:800;font-size:1.02rem}
.verdict svg{width:22px;height:22px}
.sess-foot.ok .verdict{color:var(--ok)}
.sess-foot.bad .verdict{color:var(--bad)}
@keyframes foot-up{from{transform:translateY(100%)}to{transform:none}}
.in-session .q-card{padding:6px 0 0}
.in-session .q-stem{font-size:1.14rem;line-height:1.42;margin-bottom:16px}
.in-session .opts{gap:10px}
.in-session .opt{padding:14px;min-height:58px;border-radius:14px;box-shadow:var(--shadow);font-size:.98rem}
.in-session .explain{scroll-margin-bottom:110px;border-radius:14px}
.opt{transition:transform .12s,border-color .15s,background .15s}
.opt:active:not([disabled]){transform:scale(.985)}
.opt.correct .l,.opt.wrong .l{font-size:0}
.opt.correct .l::after{content:"✓";font-size:.85rem}
.opt.wrong .l::after{content:"✕";font-size:.78rem}
.opt.correct{animation:opt-pop .28s ease-out}
.opt.wrong{animation:opt-shake .3s ease-out}
@keyframes opt-pop{40%{transform:scale(1.015)}}
@keyframes opt-shake{25%{transform:translateX(-4px)}60%{transform:translateX(3px)}}
.flash-wrap{position:relative}
.flash-wrap::before{content:"";position:absolute;left:14px;right:14px;bottom:-8px;height:40px;border-radius:0 0 20px 20px;background:var(--surface2);border:1px solid var(--line)}
.fc-face{border-top:5px solid var(--c,var(--brand2))}
.in-session .fc-btns .btn{min-height:58px;border-radius:14px}
.res-hero{text-align:center;padding:28px 20px 22px;margin-bottom:6px}
.res-hero .score-ring circle:first-child{stroke:rgba(255,255,255,.2)}
.res-hero .score-ring circle:nth-child(2){stroke:#ffc27a;animation:ring-in .8s ease-out}
.res-hero .score-ring text{fill:#fff}
@keyframes ring-in{from{stroke-dasharray:0 400}}
.res-line{display:block;margin-top:10px;font-size:1.22rem}
.res-hero p{margin:4px auto 14px;max-width:none}
.res-hero .row{margin-top:12px}
.case-h1{margin:0 0 4px}
.case-score{margin:0 0 10px}
@media (prefers-reduced-motion:reduce){.sess-foot,.opt.correct,.opt.wrong,.res-hero .score-ring circle:nth-child(2){animation:none}.mode,.drill,.topic,.pr-next,.opt{transition:none}}
/* drills */
.drill-in{margin-top:12px}
.drill-in .u{padding:0 12px;font-size:.86rem;color:var(--muted);white-space:nowrap}
.spot-rows{display:flex;flex-direction:column;gap:6px;margin-top:10px}
.spot-row{display:flex;justify-content:space-between;gap:12px;align-items:baseline;width:100%;padding:11px 12px;border:1.5px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);font:inherit;font-size:.92rem;text-align:left;cursor:pointer}
.spot-row b{text-align:right}
.spot-row.correct{border-color:var(--ok);background:var(--ok-bg)}
.spot-row.wrong{border-color:var(--bad);background:var(--bad-bg)}
/* prescription workbench */
.wb .label{margin:14px 0 8px}
.wb .label:first-child{margin-top:0}
.wb-sum{margin-top:14px}
.wb-flags{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.flag{font-size:.84rem;font-weight:700;padding:4px 10px;border-radius:999px}
.flag.bad{background:var(--bad-bg);color:var(--bad)}
.flag.warn{background:var(--warn-bg);color:var(--warn)}
/* alarm stepper */
.step-do{font-size:1.1rem;line-height:1.55;margin:4px 0 0}
.alarm .body>.btn{margin:2px 0 4px}
/* clinical pathways */
.pw-trail{list-style:none;margin:0 0 12px;padding:0 0 0 14px;border-left:2px solid var(--line)}
.pw-trail li{font-size:.84rem;margin:0 0 6px;line-height:1.4}
.pw-trail a{color:var(--muted);text-decoration:none;font-weight:600}
.pw-trail span{display:block;color:var(--brand2);font-weight:600}
.pw-trail span::before{content:"→ "}
.pw-node h2{margin:0 0 8px;font-size:1.2rem}
.pw-node .prose>:last-child{margin-bottom:0}
.pw-node .prose ul,.pw-node .prose ol{padding-left:20px}
.pw-opts .opt{justify-content:space-between;text-align:left}
.pw-opts .opt .chev{color:var(--faint)}
.pw-link{margin-top:12px}
.native .skip{display:none}
.wb .fields{align-items:end}

/* touch: every control at least 40 to 44 points tall */
.acc-foot a{display:inline-flex;align-items:center;min-height:44px}
.toc .chip{min-height:40px}