/* Study Smarter · ECG: shared styles (built by Derma-Site/build_site.py) */
:root{
  --bg:#F4F5F8; --surface:#FFFFFF; --fg:#18223A; --muted:#5E6780; --faint:#8A91A5; --line:#E3E6EE; --line2:#EEF0F5;
  --acc:#2B3A67; --on-acc:#FFFFFF; --good:#2D7A4E; --good-bg:#E4F2E9; --bad:#B03A4B; --bad-bg:#F8E3E6; --warn:#9A6A00; --warn-bg:#FBF0D2;
  --yel:#FDF3C4; --yel-line:#EBD27A; --yel-ink:#3D3412;
  --shadow:0 1px 2px rgba(20,30,60,.05),0 4px 16px rgba(20,30,60,.04);
  --font:"Inter","Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#12141A; --surface:#1B1E26; --fg:#E7E9EF; --muted:#A1A8B9; --faint:#7C8396; --line:#2C303B; --line2:#252932;
  --acc:#A9B8E8; --on-acc:#12141A; --good:#7CC89C; --good-bg:#1E3328; --bad:#F08C9A; --bad-bg:#3A2228; --warn:#E8C36A; --warn-bg:#352C14;
  --yel:#36311C; --yel-line:#6B5E2A; --yel-ink:#F4E6AE; --shadow:none; color-scheme:dark}
  :root:not([data-theme="light"]) [style*="--hd"]{--hx:var(--hd)}}
:root[data-theme="dark"]{
  --bg:#12141A; --surface:#1B1E26; --fg:#E7E9EF; --muted:#A1A8B9; --faint:#7C8396; --line:#2C303B; --line2:#252932;
  --acc:#A9B8E8; --on-acc:#12141A; --good:#7CC89C; --good-bg:#1E3328; --bad:#F08C9A; --bad-bg:#3A2228; --warn:#E8C36A; --warn-bg:#352C14;
  --yel:#36311C; --yel-line:#6B5E2A; --yel-ink:#F4E6AE; --shadow:none; color-scheme:dark}
[style*="--hd"]{--hx:var(--h)}
:root[data-theme="dark"] [style*="--hd"]{--hx:var(--hd)}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--fg)}
body{font-family:var(--font);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;font-variant-numeric:tabular-nums}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
svg.i{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;flex:none}
[hidden]{display:none!important}
/* header */
header{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
header .in{max-width:1180px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:10px}
.word{display:flex;flex-direction:column;line-height:1.1;text-decoration:none}
.word b{font-size:16px;font-weight:700;letter-spacing:-.01em}
.word span{font-size:12px;color:var(--muted);font-weight:500}
.sp{flex:1}
.pill{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 12px;font-size:13.5px;font-weight:500;cursor:pointer;white-space:nowrap;text-decoration:none}
.pill:hover{border-color:color-mix(in srgb,var(--acc) 35%,var(--line))}
.pill.on{background:color-mix(in srgb,var(--acc) 10%,var(--surface));border-color:color-mix(in srgb,var(--acc) 35%,var(--line));color:var(--acc);font-weight:600}
.ib{display:inline-grid;place-items:center;width:34px;height:34px;border:1px solid var(--line);background:var(--surface);border-radius:10px;cursor:pointer}
main{max-width:1180px;margin:0 auto;padding:22px 20px 60px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;background:var(--acc);color:var(--on-acc);border-radius:10px;padding:9px 18px;font-weight:600;cursor:pointer;text-decoration:none;font-size:14.5px}
.btn.g{background:var(--surface);color:var(--fg);border:1px solid var(--line);font-weight:500}
.btn[disabled]{opacity:.45;cursor:default}
.btn.armed{background:var(--bad-bg);color:var(--bad);border:1px solid var(--bad)}
.btn.sm{padding:6px 12px;font-size:13.5px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);min-width:0}
.card>h2{display:flex;align-items:center;gap:8px;margin:0;padding:14px 18px 12px;font-size:14.5px;font-weight:600;border-bottom:1px solid var(--line2)}
.card>h2 span{margin-left:auto;font-size:12.5px;font-weight:500;color:var(--muted)}
.cb{padding:14px 18px}
.empty{color:var(--muted);font-size:14px;padding:14px 18px}
.cap{font-size:12.5px;color:var(--muted)}
.bar{height:7px;border-radius:7px;background:var(--line2);overflow:hidden;display:flex}
.bar i{display:block;height:100%}
.seg{display:inline-flex;flex-wrap:wrap;background:var(--line2);border-radius:10px;padding:3px;gap:3px}
.seg button{border:0;background:none;border-radius:8px;padding:7px 14px;font-size:14px;font-weight:500;color:var(--muted);cursor:pointer}
.seg button.on{background:var(--surface);color:var(--fg);font-weight:600;box-shadow:0 1px 3px rgba(20,30,60,.12)}
.tag{display:inline-block;font-size:12.5px;font-weight:600;border-radius:6px;padding:2px 8px;color:#fff;background:var(--hx)}
:root[data-theme="dark"] .tag{color:#12141A}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .tag{color:#12141A}}
/* questions */
.qc{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:0 0 14px}
.qhead{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin:0 0 6px}
.chip{font-size:12px;font-weight:600;border-radius:999px;padding:1px 9px;background:var(--warn-bg);color:var(--warn)}
.qhead{flex-wrap:wrap}
.chip.past{background:color-mix(in srgb,var(--acc) 12%,var(--surface));color:var(--acc)}
.mk{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);background:var(--surface);color:var(--muted);border-radius:999px;padding:3px 10px 3px 8px;font-size:12.5px;font-weight:600;cursor:pointer;font-family:inherit}
.mk svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:2;stroke-linejoin:round}
.mk:hover{border-color:var(--faint);color:var(--fg)}
.mk.on{border-color:var(--warn);background:var(--warn-bg);color:var(--warn)}
.mk.on svg{fill:currentColor}
.stem{font-size:17px;font-weight:600;margin:4px 0 12px;line-height:1.45}
.opt{display:flex;gap:10px;width:100%;text-align:left;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:11px 12px;margin:7px 0;cursor:pointer;align-items:flex-start}
.opt .l{font-weight:700;color:var(--muted);min-width:16px}
.opt:hover:not([disabled]){border-color:var(--acc)}
.opt[disabled]{cursor:default}
.opt.pick{border-color:var(--acc);background:color-mix(in srgb,var(--acc) 8%,var(--surface))}
.opt.right{border-color:var(--good);background:var(--good-bg)} .opt.right .l{color:var(--good)}
.opt.wrong{border-color:var(--bad);background:var(--bad-bg)} .opt.wrong .l{color:var(--bad)}
.ansbar{background:var(--yel);border-left:4px solid var(--yel-line);color:var(--yel-ink);border-radius:8px;padding:9px 12px;font-weight:600;margin:10px 0 0}
.photo{display:block;margin:4px 0 10px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:6px;text-align:center}
.photo img{max-width:100%;max-height:420px;border-radius:6px;cursor:zoom-in}
.sc{font-size:15.5px;margin:0 0 6px;line-height:1.5}
.ex{margin:12px 0 0;border-top:1px solid var(--line2);padding-top:10px}
.ex ul{margin:0;padding-left:20px}.ex li{margin:3px 0}
.imgretry{display:block;margin:10px auto}
.exi{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 0}
.exi img{height:120px;max-width:100%;border-radius:8px;border:1px solid var(--line);background:#fff;cursor:zoom-in;object-fit:cover}
.qact{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:12px 0 0}
.qact .res{font-weight:600;font-size:14px}
.ok{color:var(--good);font-weight:600}.no{color:var(--bad);font-weight:600}
.pglink{font-size:13px;color:var(--muted)}
.pglink a{color:var(--acc);font-weight:600}
/* zoom overlay */
.zoom{position:fixed;inset:0;z-index:40;background:rgba(10,14,25,.85);overflow:auto;-webkit-overflow-scrolling:touch}
.zoom img{display:block;margin:0 auto;background:#fff;width:100%;max-width:none;cursor:zoom-in}
.zoom.big img{width:auto;max-width:none;cursor:zoom-out}
.zoom .x{position:fixed;top:12px;right:12px;z-index:41;border:0;border-radius:10px;background:#fff;color:#18223A;font-weight:600;padding:8px 14px;cursor:pointer}
/* modal */
.modal{position:fixed;inset:0;z-index:30;background:rgba(10,14,25,.45);display:grid;place-items:center;padding:16px}
.modal .box{width:min(420px,100%);background:var(--surface);border-radius:16px;border:1px solid var(--line);padding:20px;box-shadow:0 20px 60px rgba(0,0,0,.25)}
.modal h3{margin:0 0 6px;font-size:18px}
.modal p{margin:0 0 12px;color:var(--muted);font-size:14px}
.modal .row{display:flex;gap:8px;margin-top:6px}
.modal .msg{font-size:13.5px;color:var(--muted);margin-top:10px}
@media (max-width:620px){
  header .in,main{padding-left:16px;padding-right:16px}
  .word span{display:none}
  .word b{font-size:14.5px}
  header .in{gap:6px}
  .pill{padding:6px 9px}
  .pill .lbl{display:none}
  .qc{padding:14px}
  .stem{font-size:16px}
}

/* ---- ECG additions (appended to app.css by build_site.py) ---- */
:root{--mag:#C2185B}
.pic{margin:4px 0 10px}
.pbox{position:relative;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.pbox img{display:block;width:100%;height:auto;cursor:zoom-in}
.pbox svg.emk{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.emk .m{fill:none;stroke:var(--mag)}
.emk text{fill:var(--mag);stroke:#fff;paint-order:stroke;stroke-linejoin:round;font-family:Inter,system-ui,sans-serif;font-weight:600}
.pic .zh,.read .zh,.deck .zh,.lab .zh{font-size:12.5px;color:var(--muted);text-align:right;margin:4px 2px 0}
.how{color:var(--muted);font-size:14px;margin:2px 0 8px}
/* the item just revealed, under the ECG */
.now{display:flex;gap:10px;align-items:flex-start;margin:0 0 10px;padding:10px 14px;border-radius:10px;font-size:16px;line-height:1.4;
  background:color-mix(in srgb,var(--mag) 9%,var(--surface));border-left:4px solid var(--mag)}
.now .no{flex:none;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:13px;font-weight:700;background:var(--mag);color:#fff}
.now b{font-weight:600}
.now small{display:block;font-size:12px;color:var(--muted);margin-top:2px}
.now.flash{animation:nowin .35s ease-out}
@keyframes nowin{from{background:color-mix(in srgb,var(--mag) 28%,var(--surface))}}
.qc.big .now{font-size:19px}
.its{list-style:none;margin:6px 0 0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.its li{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:10px;padding:8px 12px;background:var(--surface);font-size:15px;line-height:1.4}
.its li .no{flex:none;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font-size:12.5px;font-weight:700;background:var(--line2);color:var(--muted)}
.its li .nm{display:block;font-weight:600;color:var(--hx,var(--acc))}
.its li .tx{display:block}
.its li:not(.on) .tx{visibility:hidden}
.its li.on{border-color:color-mix(in srgb,var(--hx,var(--acc)) 45%,var(--line))}
.its li.on .no{background:var(--hx,var(--acc));color:#fff}
.its li.cur{box-shadow:0 0 0 2px color-mix(in srgb,var(--mag) 55%,transparent)}
.ansbar .nb{font-weight:500;font-size:14px;margin-top:4px}
.deck{background:#fff;border:1px solid var(--line);border-radius:12px;padding:6px;margin:0 0 12px}
.deck iframe{display:block;width:100%;border:0;aspect-ratio:297/228;border-radius:6px;background:#fff}
.zoom .zb{position:relative;width:100%;background:#fff;cursor:zoom-in}
.zoom .zb .pbox{border:0;border-radius:0}
.zoom.big .zb{width:240%;cursor:zoom-out}
.zoom.big .zb .pbox img{cursor:zoom-out}
.read .imgs img+img{margin-top:10px}
/* one main button at each point: the big one is where to press next */
.btn.main{width:100%;padding:13px 18px;font-size:15.5px;border-radius:11px}
.qact.judge{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.qact.judge .ask{grid-column:1/-1;font-weight:600;font-size:14.5px}
.btn.yes,.btn.no{padding:13px 10px;font-size:15.5px;border-radius:11px;color:#fff}
.btn.yes{background:var(--good)}
.btn.no{background:var(--bad)}
:root[data-theme="dark"] .btn.yes,:root[data-theme="dark"] .btn.no{color:#12141A}
.lnk{border:0;background:none;color:var(--muted);font:inherit;font-size:13.5px;text-decoration:underline;cursor:pointer;padding:4px 2px}
.lnk:hover{color:var(--fg)}
a.lnk{text-decoration:none}
.nextbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:16px 0 0}
.nextbar .btn.main{flex:1 1 260px;width:auto}
.nextbar .cap{flex-basis:100%}
/* Enlarge: the question (or a teaching card) fills the screen */
.mk.enl svg{fill:none}
.qc.big,.deck.big{position:fixed;inset:0;z-index:30;margin:0;border-radius:0;border:0;overflow:auto;overscroll-behavior:contain;
  padding:16px max(16px,calc(50vw - 640px)) 28px;background:var(--surface)}
.qc.big .stem{font-size:21px}
.qc.big .its li{font-size:17px}
.qc.big .ansbar{font-size:17px}
.qc.big .photo img{max-height:70vh}
.deck .dh{display:flex;align-items:center;gap:8px;margin:0 0 6px}
.deck.big{display:flex;flex-direction:column;padding:10px 12px}
.deck.big iframe{flex:1;height:auto;aspect-ratio:auto}
/* step 2: one clean ECG, labels appear one per press (the diagnosis pages' own labels and font) */
@font-face{font-family:'Patrick Hand';src:url(/patrick.ttf) format('truetype');font-display:swap}
.lab .pbox svg,.zb svg.dsvg{display:block;width:100%;height:auto;cursor:zoom-in}
.dsvg .lg{opacity:0;transition:opacity .3s}
.dsvg .lg.on{opacity:1}
.dsvg .lb{font-family:'Patrick Hand','Segoe Print',cursive;fill:#172B52;paint-order:stroke;stroke:#fff;stroke-linejoin:round;stroke-width:.28em}
.dsvg line,.dsvg path,.dsvg rect{stroke:#D3007F}
.dsvg marker path{fill:#D3007F;stroke:none}
.labctl{display:flex;align-items:center;gap:6px 14px;flex-wrap:wrap;margin:10px 0 0}
.labctl .btn.main{flex:1 1 260px;width:auto}
.labcap{margin:10px 0 0;color:var(--muted);font-size:14px}
.lab .dh{display:flex;align-items:center;gap:8px;margin:0 0 6px}
.lab .dh .lt{display:none;font-size:17px}
/* enlarged: the ECG fills the screen above the same controls */
.lab.big{position:fixed;inset:0;z-index:30;background:var(--surface);overflow:auto;overscroll-behavior:contain;
  padding:12px max(12px,calc(50vw - 760px)) 18px;display:flex;flex-direction:column}
.lab.big .dh .lt{display:block}
.lab.big .pbox{flex:none;display:flex;justify-content:center;background:#fff}
.lab.big .pbox svg{width:100%;height:calc(100vh - 170px);max-height:none;cursor:default}
.lab.big .zh{display:none}
.lab.big .labctl{position:sticky;bottom:0;background:var(--surface);padding:10px 0 4px;margin:0}
.lab .swipe{display:none}
/* phone: the enlarged ECG is drawn wider than the screen and moves sideways, so it is really bigger */
@media (max-width:760px){
  .lab.big .pbox{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;flex:1;align-content:center}
  .lab.big .pbox svg{width:940px;max-width:none;height:auto}
  .lab.big .swipe{display:block;font-size:12.5px;color:var(--muted);text-align:center;margin:6px 0 0}
}
/* tappable terms -> high-yield card popup (above an enlarged question) */
.term{border:0;background:none;padding:0;font:inherit;color:inherit;cursor:pointer;text-decoration:underline dotted;
  text-decoration-color:var(--mag);text-decoration-thickness:2px;text-underline-offset:3px}
.term:hover{color:var(--mag)}
.dsvg text.lb[data-term]{cursor:pointer;text-decoration:underline dotted #D3007F}
.modal:has(.tbox){z-index:45}
.modal .tbox{width:min(520px,100%);max-height:88vh;overflow:auto}
.tbox .tm{background:color-mix(in srgb,var(--acc) 9%,var(--surface));border-radius:10px;padding:9px 12px;margin:6px 0 12px}
.tbox .tm p{margin:0 0 5px;color:var(--fg);font-size:14.5px}.tbox .tm p:last-child{margin:0}
.tbox .ts{color:var(--faint);font-size:12px}
.tbox .tl{font-weight:700;font-size:12.5px;color:var(--mag);text-transform:uppercase;letter-spacing:.04em}
.tbox ol{margin:4px 0 8px;padding-left:22px}.tbox li{margin:2px 0;font-size:14.5px}
@media (max-width:760px){.deck iframe{aspect-ratio:auto;height:82vh}}
@media (max-width:620px){.its{grid-template-columns:1fr}}