/* Waves to Hearing: course chrome (top bar, pager, safety notice, quiz).
   Prefixed sh- so it can sit on top of the two ported pages' own styles. */
:root{
  --sh-bg:#f7f5f0; --sh-panel:#ffffff; --sh-ink:#1d2330; --sh-muted:#5b6475; --sh-line:#dcd8ce;
  --sh-accent:#0b6e75; --sh-accent-ink:#ffffff; --sh-soft:#d9eeee;
  --sh-ok:#2f7d32; --sh-ok-soft:#e3f1e3; --sh-bad:#b3261e; --sh-bad-soft:#f8e3e1; --sh-warn:#9a5b00; --sh-warn-soft:#fbefd9;
  --sh-shadow:0 10px 30px rgba(20,25,35,.16);
  --sh-bar-h:48px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --sh-bg:#14171d; --sh-panel:#1c2028; --sh-ink:#e7e9ee; --sh-muted:#9aa3b2; --sh-line:#2e3440;
    --sh-accent:#4fc1c8; --sh-accent-ink:#0b1416; --sh-soft:#1d3436;
    --sh-ok:#73c476; --sh-ok-soft:#1d2e1e; --sh-bad:#ff7a70; --sh-bad-soft:#3a2120; --sh-warn:#f2b45a; --sh-warn-soft:#352a17;
    --sh-shadow:0 10px 30px rgba(0,0,0,.5);
  }
}
:root[data-theme="dark"]{
  --sh-bg:#14171d; --sh-panel:#1c2028; --sh-ink:#e7e9ee; --sh-muted:#9aa3b2; --sh-line:#2e3440;
  --sh-accent:#4fc1c8; --sh-accent-ink:#0b1416; --sh-soft:#1d3436;
  --sh-ok:#73c476; --sh-ok-soft:#1d2e1e; --sh-bad:#ff7a70; --sh-bad-soft:#3a2120; --sh-warn:#f2b45a; --sh-warn-soft:#352a17;
  --sh-shadow:0 10px 30px rgba(0,0,0,.5);
}

body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:60;background:var(--sh-panel)}
.sh-bar{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:var(--sh-panel);border-bottom:1px solid var(--sh-line);
  font:500 13px/1.2 "IBM Plex Sans",system-ui,sans-serif;color:var(--sh-ink)}
.sh-bar-in{max-width:1200px;margin:0 auto;min-height:var(--sh-bar-h);display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  padding-block:6px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.sh-home{font:700 15px/1 "Source Serif 4",Georgia,serif;color:var(--sh-ink);text-decoration:none;white-space:nowrap}
.sh-home span{color:var(--sh-accent)}
.sh-bar select{font:inherit;max-width:min(320px,52vw);padding:6px 8px;border-radius:8px;border:1px solid var(--sh-line);background:var(--sh-bg);color:var(--sh-ink)}
.sh-sp{flex:1}
.sh-vol{display:flex;align-items:center;gap:6px;color:var(--sh-muted)}
.sh-vol input{width:110px;accent-color:var(--sh-accent)}
.sh-vol output{font:500 12px "IBM Plex Mono",monospace;color:var(--sh-ink);min-width:48px;text-align:right}
.sh-btn{font:500 13px "IBM Plex Sans",system-ui,sans-serif;border:1px solid var(--sh-line);background:var(--sh-bg);color:var(--sh-ink);
  padding:6px 11px;border-radius:8px;cursor:pointer}
.sh-btn:hover{border-color:var(--sh-accent)}
.sh-btn:focus-visible,.sh-bar select:focus-visible,.sh-vol input:focus-visible{outline:2px solid var(--sh-accent);outline-offset:2px}
.sh-btn.pri{background:var(--sh-accent);border-color:var(--sh-accent);color:var(--sh-accent-ink)}
.sh-stop{font-weight:600}
@media (max-width:620px){ .sh-vol input{width:80px} .sh-vol span{display:none} :root{--sh-bar-h:0px} .sh-bar{position:static} }

.sh-notice{max-width:1200px;margin:10px auto 0;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.sh-notice-in{display:flex;gap:12px;align-items:flex-start;background:var(--sh-warn-soft);color:var(--sh-ink);border:1px solid color-mix(in srgb,var(--sh-warn) 35%,transparent);
  border-radius:12px;padding:10px 14px;font:14px/1.5 "IBM Plex Sans",system-ui,sans-serif}
.sh-notice-in p{margin:0;flex:1;min-width:0}

.sh-pager{max-width:980px;margin:40px auto 0;display:flex;gap:12px;justify-content:space-between;flex-wrap:wrap;
  padding-block:0 60px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));font-family:"IBM Plex Sans",system-ui,sans-serif}
.sh-pager a{flex:1 1 240px;display:block;text-decoration:none;color:var(--sh-ink);background:var(--sh-panel);border:1px solid var(--sh-line);border-radius:12px;padding:12px 16px}
.sh-pager a:hover{border-color:var(--sh-accent)}
.sh-pager small{display:block;color:var(--sh-muted);font-size:12px;text-transform:uppercase;letter-spacing:.08em}
.sh-pager b{font-weight:600}
.sh-pager .nx{text-align:right}

/* ---------- quiz ---------- */
.qz{font:15px/1.55 "IBM Plex Sans",system-ui,sans-serif;color:var(--sh-ink);background:var(--sh-panel);border:1px solid var(--sh-line);border-radius:12px;padding:12px 14px;margin:10px 0}
.qz .qz-q{font-weight:500;margin:0 0 8px}
.qz .qz-n{font:500 11px "IBM Plex Mono",monospace;color:var(--sh-accent);letter-spacing:.06em;text-transform:uppercase;margin-bottom:4px}
.qz .qz-opts{display:flex;flex-direction:column;gap:6px}
.qz .qz-opt{text-align:left;font:inherit;font-size:14.5px;border:1px solid var(--sh-line);background:var(--sh-bg);color:var(--sh-ink);padding:8px 11px;border-radius:9px;cursor:pointer;display:flex;gap:8px;align-items:flex-start}
.qz .qz-opt:hover:not([disabled]){border-color:var(--sh-accent)}
.qz .qz-opt:focus-visible{outline:2px solid var(--sh-accent);outline-offset:2px}
.qz .qz-opt[disabled]{cursor:default}
.qz .qz-opt.ok{border-color:var(--sh-ok);background:var(--sh-ok-soft)}
.qz .qz-opt.bad{border-color:var(--sh-bad);background:var(--sh-bad-soft)}
.qz .qz-opt input{margin-top:4px;accent-color:var(--sh-accent)}
.qz .qz-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:8px}
.qz .qz-num{font:15px "IBM Plex Mono",monospace;width:130px;padding:7px 9px;border-radius:8px;border:1px solid var(--sh-line);background:var(--sh-bg);color:var(--sh-ink)}
.qz .qz-fb{margin-top:10px;padding:9px 12px;border-radius:9px;font-size:14px}
.qz .qz-fb.ok{background:var(--sh-ok-soft);border-left:3px solid var(--sh-ok)}
.qz .qz-fb.bad{background:var(--sh-bad-soft);border-left:3px solid var(--sh-bad)}
.qz .qz-fb p{margin:0}
.qz .qz-fb b.v{color:var(--sh-ok)}
.qz .qz-fb.bad b.v{color:var(--sh-bad)}
.qz-score{font:500 14px "IBM Plex Sans",system-ui,sans-serif;color:var(--sh-muted);display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:6px 0 4px}
.qz-score b{color:var(--sh-ink);font-family:"IBM Plex Mono",monospace}

.sh-check{display:inline-flex;align-items:center;gap:8px;margin:14px 0 4px;font:500 14px "IBM Plex Sans",system-ui,sans-serif;border:1px dashed var(--sh-accent);
  background:var(--sh-soft);color:var(--sh-ink);border-radius:999px;padding:7px 14px;cursor:pointer}
.sh-check:hover{border-style:solid}
.sh-check .d{font:500 12px "IBM Plex Mono",monospace;color:var(--sh-accent)}
.sh-check.done{border-style:solid;border-color:var(--sh-ok);background:var(--sh-ok-soft)}

.sh-toast{position:fixed;z-index:70;left:calc(14px + env(safe-area-inset-left,0px));bottom:calc(14px + env(safe-area-inset-bottom,0px));
  max-width:min(360px,calc(100vw - 28px));background:var(--sh-panel);color:var(--sh-ink);border:1px solid var(--sh-accent);border-radius:12px;
  box-shadow:var(--sh-shadow);padding:10px 12px;display:flex;gap:10px;align-items:center;font:14px/1.4 "IBM Plex Sans",system-ui,sans-serif;
  transform:translateY(0);opacity:1;transition:opacity .25s,transform .25s}
.sh-toast[hidden]{display:none!important}
.sh-toast .t{flex:1;min-width:0}
.sh-toast .t small{display:block;color:var(--sh-accent);font:500 11px "IBM Plex Mono",monospace;letter-spacing:.08em;text-transform:uppercase}
.sh-x{border:0;background:transparent;color:var(--sh-muted);font-size:18px;line-height:1;cursor:pointer;padding:4px 6px;border-radius:6px}
.sh-x:hover{color:var(--sh-ink)}

.sh-drawer{position:fixed;z-index:80;right:calc(14px + env(safe-area-inset-right,0px));bottom:calc(14px + env(safe-area-inset-bottom,0px));
  width:min(460px,calc(100vw - 28px));max-height:min(78vh,720px);display:flex;flex-direction:column;background:var(--sh-bg);color:var(--sh-ink);
  border:1px solid var(--sh-line);border-radius:14px;box-shadow:var(--sh-shadow);font-family:"IBM Plex Sans",system-ui,sans-serif}
.sh-drawer[hidden]{display:none!important}
.sh-drawer-h{display:flex;align-items:center;gap:8px;padding:10px 12px 8px 16px;border-bottom:1px solid var(--sh-line)}
.sh-drawer-h div{flex:1;min-width:0}
.sh-drawer-h small{display:block;color:var(--sh-accent);font:500 11px "IBM Plex Mono",monospace;letter-spacing:.08em;text-transform:uppercase}
.sh-drawer-h b{font:700 17px/1.2 "Source Serif 4",Georgia,serif}
.sh-drawer-b{overflow:auto;padding:4px 12px 12px}
.sh-drawer-f{display:flex;justify-content:flex-end;gap:8px;padding:8px 12px;border-top:1px solid var(--sh-line)}
@media (max-width:560px){ .sh-drawer{right:0;left:0;bottom:0;width:auto;border-radius:14px 14px 0 0;max-height:82vh;padding-bottom:env(safe-area-inset-bottom,0px)} }
@media (prefers-reduced-motion: reduce){ .sh-toast{transition:none} }