/* নিরাপত্তা চিহ্ন শিখুন (safety-signs): animated legend, sign grid by family, 15-question quiz.
   Palette from hangeulbondhu-guide.css: teal #0b8d77 / #0b6b60, ink #163847, soft #e3f3ee. */
.ss,.ss-legend{--ss-teal:#0b8d77;--ss-teal-d:#0b6b60;--ss-ink:#163847;--ss-muted:#4f6873;--ss-soft:#e3f3ee;--ss-line:#dde8e5;--ss-red:#d62828;--ss-blue:#1d5fb4;--ss-yel:#f6c21c;--ss-grn:#1f8f4e}
.ss [hidden]{display:none!important}
.ss-legend{margin:0 0 22px}

/* legend */
.ss-lg{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:0;padding:0;list-style:none}
.ss-lg-item{display:flex;flex-direction:column;gap:10px;padding:16px;border-radius:18px;background:#f7faf9;border:1px solid #e3ece9}
.ss-lg-item svg{display:block;width:72px;height:72px;filter:drop-shadow(0 6px 10px #123b331f)}
.ss-lg-item strong{display:block;font-size:16px;line-height:1.45;color:var(--ss-ink)}
.ss-lg-item strong span{display:inline-block;font-size:13px;font-weight:600;color:#6b818a}
.ss-lg-item em{display:inline-block;margin:4px 0;padding:2px 9px;border-radius:10px;font-size:12px;font-style:normal;font-weight:700}
.ss-lg-prohibit em{background:#fde8e8;color:#a61e1e}
.ss-lg-mandatory em{background:#e5eefb;color:#174a8c}
.ss-lg-warning em{background:#fdf3cf;color:#7a5a00}
.ss-lg-safe em{background:#e2f3e8;color:#17703c}
.hbx .ss-lg-item p{margin:0;font-size:14px;line-height:1.7;color:var(--ss-muted)}
.hbx .ss-lg-note{display:flex;align-items:center;gap:10px;margin:14px 0 0;font-size:14px;line-height:1.6;color:var(--ss-muted)}
.ss-dot{flex:none;width:22px;height:22px;border-radius:5px;background:var(--ss-red);box-shadow:inset 0 0 0 5px var(--ss-red),inset 0 0 0 8px #fff}
/* legend animation (only when JS is on) */
.ss-js .ss-anim .ss-lg-item{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
.ss-js .ss-anim .ss-lg-item svg{transform:scale(.4) rotate(-12deg);transition:transform .7s cubic-bezier(.3,1.5,.5,1)}
.ss-js .ss-anim.is-in .ss-lg-item{opacity:1;transform:none}
.ss-js .ss-anim.is-in .ss-lg-item svg{transform:none}
.ss-anim .d2,.ss-anim .d2 svg{transition-delay:.12s!important}
.ss-anim .d3,.ss-anim .d3 svg{transition-delay:.24s!important}
.ss-anim .d4,.ss-anim .d4 svg{transition-delay:.36s!important}

/* mode tabs */
.ss-modes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;margin:0 0 18px;padding:6px;border-radius:18px;background:#fff;border:1px solid var(--ss-line);box-shadow:0 8px 24px #123b330a}
.ss-mode{display:flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:8px 10px;border:0;border-radius:13px;background:transparent;color:var(--ss-ink);font:inherit;font-size:16px;font-weight:700;cursor:pointer;transition:background .2s,color .2s}
.ss-mode:hover{background:#f1f7f5}
.ss-mode.is-on{background:linear-gradient(150deg,#0f7a6b,#123f6b);color:#fff;box-shadow:0 8px 18px #0f3b4a2b}
.ss-mode:focus-visible,.ss-opt:focus-visible,.ss-play:focus-visible,.ss-jump a:focus-visible{outline:3px solid #f0b54a;outline-offset:2px}

/* jump links */
.ss-jump{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.ss-jump a{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:6px 14px 6px 10px;border:1px solid #cfe1da;border-radius:999px;background:#fff;color:var(--ss-ink);font-size:14px;font-weight:650;text-decoration:none}
.ss-jump a::before{content:"";width:16px;height:16px;border-radius:50%}
.ss-jump-prohibit::before{border:3px solid var(--ss-red);box-sizing:border-box}
.ss-jump-mandatory::before{background:var(--ss-blue)}
.ss-jump-warning::before{border-radius:0!important;background:var(--ss-yel);clip-path:polygon(50% 0,100% 100%,0 100%)}
.ss-jump-safe::before{border-radius:4px!important;background:var(--ss-grn)}
.ss-jump small{padding:1px 7px;border-radius:999px;background:var(--ss-soft);color:var(--ss-teal-d);font-size:12px}

/* family sections + cards */
.ss-fam{margin:0 0 30px;scroll-margin-top:20px}
.ss-fam header{margin:0 0 14px;padding:0 0 0 14px;border-left:5px solid var(--ss-teal)}
.ss-fam-prohibit header{border-color:var(--ss-red)}.ss-fam-mandatory header{border-color:var(--ss-blue)}.ss-fam-warning header{border-color:var(--ss-yel)}.ss-fam-safe header{border-color:var(--ss-grn)}
.ss-fam h2{margin:0 0 4px;font-size:22px;color:var(--ss-ink)}
.ss-fam h2 small{font-size:14px;font-weight:600;color:#6b818a}
.hbx .ss-fam header p{margin:0;font-size:14px;line-height:1.7;color:var(--ss-muted)}
.ss-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:14px}
.ss-card{display:flex;gap:14px;padding:16px;border:1px solid var(--ss-line);border-radius:20px;background:#fff;box-shadow:0 8px 24px #123b330a;transition:transform .2s,box-shadow .2s,border-color .2s}
.ss-card:hover{transform:translateY(-2px);border-color:#c6e0d7;box-shadow:0 14px 30px #123b3314}
.ss-card.is-playing{border-color:var(--ss-teal);box-shadow:0 0 0 3px #0b8d7722}
.ss-pic{flex:none;width:92px;height:92px;padding:6px;border-radius:16px;background:#f5f8f7}
.ss-pic svg,.ss-qz-stem svg,.ss-opt svg,.ss-review svg{display:block;width:100%;height:100%}
.ss-txt{min-width:0;display:flex;flex-direction:column;gap:3px}
.ss-name{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}
.hbx .ss-ko{margin:0;font-family:"HB Korean","GVS Korean","Noto Sans KR",sans-serif;font-size:21px;line-height:1.35;font-weight:800;color:var(--ss-ink);word-break:keep-all}
.ss-play{flex:none;display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;margin:-4px -4px 0 0;border:0;border-radius:50%;background:var(--ss-soft);color:var(--ss-teal-d);cursor:pointer;transition:background .2s,color .2s}
.ss-play svg{width:20px;height:20px;fill:currentColor;margin-left:3px}
.ss-play:hover,.is-playing .ss-play,.ss-play.is-playing{background:var(--ss-teal);color:#fff}
.hbx .ss-pr{margin:0;font-size:13px;color:var(--ss-teal-d)}
.hbx .ss-bn{margin:2px 0 0;font-size:15px;line-height:1.55;font-weight:700;color:#2d4752}
.hbx .ss-where{margin:2px 0 0;font-size:13px;line-height:1.65;color:var(--ss-muted)}

/* quiz */
.ss-qz{max-width:760px;margin:0 auto;padding:24px;border:1px solid var(--ss-line);border-radius:24px;background:#fff;box-shadow:0 14px 34px #123b330f}
.ss-qz-start,.ss-qz-end{text-align:center}
.ss-qz-ico{display:inline-flex;align-items:center;justify-content:center;width:76px;height:76px;border-radius:24px;background:var(--ss-soft);font-size:38px}
.ss-qz h2{margin:12px 0 6px;font-size:23px;color:var(--ss-ink)}
.hbx .ss-qz-start p{max-width:52ch;margin:0 auto 16px;line-height:1.8;color:var(--ss-muted)}
.ss-qz .kc-button{display:inline-flex;width:auto;min-height:50px;padding:10px 26px;font-size:16px;cursor:pointer}
.ss-qz-top{display:flex;justify-content:space-between;font-weight:700;color:var(--ss-muted)}
.ss-qz-score{color:var(--ss-teal)}
.ss-qz-trk{display:block;height:8px;margin:8px 0 16px;border-radius:4px;background:#edf3f1;overflow:hidden}
.ss-qz-fill{display:block;width:0;height:100%;background:linear-gradient(90deg,#18977f,#123f6b);transition:width .5s ease}
.hbx .ss-qz-ask{margin:0 0 10px;font-size:17px;font-weight:700;line-height:1.6;color:var(--ss-ink);text-align:center}
.ss-qz-stem{display:flex;justify-content:center;margin:0 0 16px}
.ss-qz-stem .ss-stem-pic{width:min(190px,48vw);height:min(190px,48vw);padding:10px;border-radius:24px;background:#f5f8f7;animation:ss-in .45s cubic-bezier(.3,1.4,.5,1)}
.hbx .ss-qz-stem .ss-stem-ko{margin:4px 0 0;padding:18px 28px;border-radius:20px;background:linear-gradient(150deg,#0f7a6b,#123f6b);color:#fff;font-family:"HB Korean","GVS Korean",sans-serif;font-size:clamp(28px,6vw,40px);font-weight:800;line-height:1.3;text-align:center;word-break:keep-all;animation:ss-in .45s cubic-bezier(.3,1.4,.5,1)}
@keyframes ss-in{from{opacity:0;transform:scale(.85)}to{opacity:1;transform:none}}
.ss-opts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.ss-opt{position:relative;display:flex;align-items:center;gap:12px;width:100%;min-height:62px;padding:10px 14px;border:2px solid #d5e6e0;border-radius:16px;background:#fff;color:var(--ss-ink);font:inherit;text-align:left;cursor:pointer;transition:border-color .2s,background .2s,transform .15s}
.ss-opt:hover:not(:disabled){border-color:#9fd2c4;background:#f8fcfa}
.ss-opt:active:not(:disabled){transform:scale(.98)}
.ss-opt b{flex:none;display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:10px;background:var(--ss-soft);color:var(--ss-teal-d);font-size:15px}
.ss-opt span{font-family:"HB Korean","GVS Korean",sans-serif;font-size:20px;font-weight:700;line-height:1.35;word-break:keep-all}
.ss-opts.is-pics .ss-opt{flex-direction:column;justify-content:center;min-height:0;padding:12px 10px 10px}
.ss-opts.is-pics .ss-opt b{position:absolute;left:8px;top:8px}
.ss-opts.is-pics .ss-opt i{display:block;width:min(130px,32vw);height:min(130px,32vw)}
.ss-opt:disabled{cursor:default}
.ss-opt.is-right{border-color:#18977f;background:#e9f7f2;animation:ss-pop .35s ease}
.ss-opt.is-right b{background:#18977f;color:#fff}
.ss-opt.is-wrong{border-color:#d9534f;background:#fdf0ef;animation:ss-shake .35s ease}
.ss-opt.is-wrong b{background:#d9534f;color:#fff}
@keyframes ss-pop{50%{transform:scale(1.03)}}
@keyframes ss-shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.hbx .ss-qz-fb{min-height:26px;margin:14px 0 8px;font-weight:650;line-height:1.65;text-align:center}
.hbx .ss-qz-fb.ok{color:#0b6b60}.hbx .ss-qz-fb.no{color:#b23b37}
.ss-qz-q>.kc-button{display:flex;margin:0 auto}
.hbx .ss-qz-keys{margin:12px 0 0;font-size:12px;color:#6b818a;text-align:center}
.ss-ring-box{position:relative;width:150px;height:150px;margin:0 auto 14px}
.ss-ring{display:block;width:150px;height:150px}
.ss-ring circle{fill:none;stroke-width:12}
.ss-ring-bg{stroke:#edf3f1}
.ss-ring-fg{stroke:#0b8d77;stroke-linecap:round;transform:rotate(-90deg);transform-origin:60px 60px;stroke-dasharray:326.73;stroke-dashoffset:326.73;transition:stroke-dashoffset 1.2s cubic-bezier(.2,.8,.2,1)}
.ss-qz-end.is-low .ss-ring-fg{stroke:#c9821b}
.hbx .ss-qz-big{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;margin:0;font-size:34px;font-weight:800;color:var(--ss-ink)}
.hbx .ss-qz-msg{margin:0 0 14px;font-size:16px;line-height:1.7;color:var(--ss-muted)}
.ss-qz-again{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:0 0 20px}
.ss-qz-end h3{margin:8px 0 10px;font-size:18px;text-align:left;color:var(--ss-ink)}
.ss-review{display:grid;gap:8px;margin:0;padding:0;list-style:none;text-align:left}
.ss-review li{display:grid;grid-template-columns:auto 56px minmax(0,1fr);align-items:center;gap:12px;padding:10px 12px;border-radius:14px;background:#f6faf8;border:1px solid #e1ece8}
.ss-review li.no{background:#fdf5f4;border-color:#f3d9d6}
.ss-review i{font-style:normal;font-weight:800;color:#0b8d77}
.ss-review li.no i{color:#b23b37}
.ss-review .ss-rv-pic{width:56px;height:56px}
.ss-review strong{display:block;font-family:"HB Korean","GVS Korean",sans-serif;font-size:17px;color:var(--ss-ink)}
.ss-review small{display:block;font-size:13px;line-height:1.55;color:var(--ss-muted)}
.ss-review em{font-style:normal;color:#b23b37}

.hbx .ss-toast{position:fixed;left:50%;bottom:20px;z-index:50;max-width:calc(100% - 32px);margin:0;padding:10px 18px;border-radius:999px;background:#163847;color:#fff;font-size:14px;box-shadow:0 10px 30px #0004;transform:translateX(-50%)}
.ss-exam{margin:28px 0 16px}
.ss-exam ul{padding-left:20px;line-height:1.8}
.ss-cta{margin:0 0 14px}
.ss-cta h2{margin:0 0 6px;font-size:20px;color:var(--ss-ink)}
.hbx .ss-cta p{margin:0;line-height:1.75;color:#2d4752}
.hbx .ss-credit{margin:10px 0 0;font-size:12px;line-height:1.7;color:#6b818a}

@media(max-width:900px){.ss-lg{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){
 .ss-lg{gap:10px}
 .ss-lg-item{padding:12px}
 .ss-lg-item svg{width:56px;height:56px}
 .hbx .ss-lg-item p{font-size:13px}
 .ss-grid{grid-template-columns:1fr}
 .ss-pic{width:84px;height:84px}
 .ss-qz{padding:18px 14px}
 .ss-opts{grid-template-columns:1fr}
 .ss-opts.is-pics{grid-template-columns:repeat(2,minmax(0,1fr))}
 .ss-opt span{font-size:19px}
 .ss-jump a{font-size:13px}
}
@media(prefers-reduced-motion:reduce){.ss *,.ss-legend *{transition:none!important;animation:none!important}.ss-js .ss-anim .ss-lg-item,.ss-js .ss-anim .ss-lg-item svg{opacity:1;transform:none}}
.ss-qz,.ss-qz-end,.ss-view{scroll-margin-top:110px}