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i{width:7px;height:7px;border-radius:50%;background:var(--brand-orange);flex:none}.eyebrow-pill-blue{background:var(--accent-blue-soft);border-color:#d8e6fd;color:var(--accent-blue-deep)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border-radius:var(--radius-pill);border:1px solid transparent;font-weight:700;font-size:.95rem;line-height:1;padding:14px 26px;white-space:nowrap;transition:transform .15s,box-shadow .15s,background .15s,border-color .15s}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--brand-orange);color:#fff;box-shadow:var(--shadow-glow)}.btn-primary:hover{background:var(--brand-orange-deep);box-shadow:0 10px 26px #ea580c6b,0 2px 8px #ea580c4d}.btn-ghost{background:var(--surface-card);color:var(--ink-primary);border-color:var(--line-strong);box-shadow:var(--shadow-sm)}.btn-ghost:hover{border-color:var(--ink-primary)}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin:0 0 22px}.section-head h2{font-family:var(--font-display);font-weight:400;font-size:var(--text-h1);line-height:1.16;margin:14px 0 10px;letter-spacing:-.01em}.section-head h2 em,.page-hero h1 em,.hero-title em{font-style:italic;color:var(--brand-orange-deep)}.section-head p{margin:0;color:var(--ink-secondary);max-width:640px}.page-hero{padding:34px 0 8px;max-width:780px}.page-hero.compact{padding:18px 0 6px}.page-hero h1{font-family:var(--font-display);font-weight:400;font-size:var(--text-h1);line-height:1.15;margin:16px 0 12px;letter-spacing:-.01em}.page-hero p{margin:0;color:var(--ink-secondary);font-size:1.05rem}.site-header{position:sticky;top:0;z-index:50;background:#ffffffeb;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.header-inner{max-width:var(--content-max);margin:0 auto;min-height:var(--header-h);padding:0 22px;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:10px;white-space:nowrap}.brand-logo{height:30px;width:auto;max-width:120px;object-fit:contain}.brand-mark{display:grid;place-items:center;width:32px;height:32px;background:var(--ink-primary);color:#fff;border-radius:9px;font-weight:800;font-size:16px}.brand-logo:not([style*="display: none"])+.brand-mark{display:none}.brand-name{font-size:15.5px;font-weight:500;letter-spacing:-.01em;color:var(--ink-secondary)}.brand-name b{font-weight:800;color:var(--ink-primary)}.desktop-nav{display:flex;align-items:center;gap:4px;font-size:14px;font-weight:600;color:var(--ink-secondary)}.desktop-nav a{padding:8px 12px;border-radius:var(--radius-pill);transition:background .15s,color .15s}.desktop-nav a:hover{color:var(--ink-primary);background:var(--surface-sunken)}.header-search{flex:1;max-width:380px;margin-left:auto;display:flex;align-items:center;gap:9px;height:42px;padding:0 12px;background:var(--surface-sunken);border:1px solid transparent;border-radius:var(--radius-pill);color:var(--ink-muted);transition:border-color .15s,background .15s,box-shadow .15s}.header-search:focus-within{background:var(--surface-card);border-color:var(--line-strong);box-shadow:var(--shadow-sm)}.header-search input{flex:1;min-width:0;border:0;outline:0;background:transparent;font-size:14px;color:var(--ink-primary)}.header-search input::placeholder{color:var(--ink-muted)}.header-search kbd{font-family:var(--font-ui);font-size:11px;font-weight:600;color:var(--ink-muted);border:1px solid var(--line-strong);border-radius:6px;padding:2px 6px;background:var(--surface-card)}.lang-toggle{display:flex;padding:3px;gap:2px;background:var(--surface-sunken);border-radius:var(--radius-pill)}.lang-toggle button{border:0;background:transparent;border-radius:var(--radius-pill);font-size:12.5px;font-weight:700;padding:7px 13px;color:var(--ink-muted);transition:background .15s,color .15s}.lang-toggle button.active{background:var(--ink-primary);color:#fff}.lang-toggle button:not(.active):hover{color:var(--ink-primary)}.header-login{display:block}.login-btn{border:1.5px solid var(--line-strong);background:var(--surface-card);border-radius:var(--radius-pill);font-weight:700;font-size:13.5px;padding:9px 18px;color:var(--ink-primary);transition:border-color .15s}.login-btn:hover{border-color:var(--brand-orange);color:var(--brand-orange-deep)}.login-slot{position:relative}.login-pop{position:absolute;right:0;top:calc(100% + 10px);z-index:60;width:280px;padding:18px;background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-md);box-shadow:var(--shadow-lift)}.login-pop b{font-size:14.5px}.login-pop p{margin:8px 0 12px;font-size:13px;color:var(--ink-secondary);line-height:1.55}.login-pop a{display:inline-block;font-size:13px;font-weight:700;color:var(--brand-orange-deep)}.burger{display:flex;flex-direction:column;gap:5px;align-items:center;justify-content:center;background:none;border:0;padding:8px;flex:none}.burger span{width:21px;height:2px;background:var(--ink-primary);border-radius:2px}.mobile-drawer{display:block;border-top:1px solid var(--line);background:var(--surface-card);padding:14px 22px 20px}.mobile-drawer nav{display:flex;flex-direction:column}.mobile-drawer nav a{padding:13px 4px;font-weight:600;font-size:15px;border-bottom:1px solid var(--line)}.drawer-row{display:flex;align-items:center;justify-content:space-between;margin-top:16px}.hero{position:relative;overflow:hidden;background:radial-gradient(60% 90% at 50% -10%,#ffedd5,#ffedd500 62%),var(--surface-hero);border-bottom:1px solid var(--line)}.hero-inner{max-width:880px;margin:0 auto;padding:100px 22px 84px;text-align:center;position:relative}.hero-title{font-family:var(--font-display);font-weight:400;font-size:clamp(2.35rem,5.6vw,4rem);line-height:1.1;margin:24px 0 20px;letter-spacing:-.014em}.hero-title em{white-space:normal}.hero-sub{margin:0 auto 30px;max-width:640px;font-family:var(--font-serif-body);font-size:1.12rem;color:var(--ink-secondary)}:lang(bn) .hero-sub{font-family:var(--font-bn-body)}.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.hero-trust{list-style:none;display:flex;gap:22px;justify-content:center;flex-wrap:wrap;margin:30px 0 0;padding:0;font-size:13px;font-weight:600;color:var(--ink-muted)}.hero-trust li{display:flex;align-items:center;gap:6px}.hero-tiles{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.ht{position:absolute;display:grid;place-items:center;font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--brand-orange-deep);background:#ffffffbf;border:1px solid var(--brand-orange-tint);border-radius:14px;box-shadow:var(--shadow-sm);padding:12px 14px;opacity:.9}.ht-1{top:18%;left:6%;transform:rotate(-7deg)}.ht-2{top:24%;right:7%;transform:rotate(6deg)}.ht-3{bottom:16%;left:12%;transform:rotate(4deg)}.ht-4{bottom:20%;right:13%;transform:rotate(-5deg)}.stats-band{border-bottom:1px solid var(--line);background:var(--surface-bg)}.stats-grid{max-width:var(--content-max);margin:0 auto;padding:22px;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.stat-card{background:transparent;border:0;border-radius:0;box-shadow:none;padding:6px 10px;display:flex;flex-direction:column;gap:2px}.stat-card b{font-family:var(--font-display);font-weight:400;font-size:1.7rem;line-height:1.05;color:var(--ink-primary)}.stat-card span{font-size:12.5px;font-weight:600;color:var(--ink-muted)}.progress-strip{background:var(--surface-sunken);border-bottom:1px solid var(--line)}.progress-strip-inner{max-width:var(--content-max);margin:0 auto;padding:12px 22px;display:flex;align-items:center;gap:16px}.progress-pct{font-family:var(--font-display);font-size:1.25rem;color:var(--brand-orange-deep);min-width:52px}.progress-bar{flex:1;height:8px;background:var(--line);border-radius:var(--radius-pill);overflow:hidden}.progress-bar i{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--brand-orange),var(--brand-orange-deep));transition:width .5s ease}.progress-label{font-size:13px;font-weight:600;color:var(--ink-secondary);white-space:nowrap}.home-progress{background:var(--surface-sunken);border-top:1px solid var(--line)}.home-progress-inner{max-width:var(--content-max);margin:0 auto;padding:42px 22px 56px}.hp-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.hp-head h2{font-family:var(--font-display);font-weight:400;font-size:var(--text-h2);margin:0 0 4px}.hp-reset{border:0;background:none;font-size:13px;font-weight:600;color:var(--ink-muted);text-decoration:underline}.hp-reset:hover{color:#dc2626}.hp-stats{display:flex;gap:14px;flex-wrap:wrap;margin:20px 0 22px}.hp-stats>div{background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 20px;display:flex;flex-direction:column;min-width:130px}.hp-stats b{font-family:var(--font-display);font-size:1.55rem;color:var(--brand-orange-deep)}.hp-stats span{font-size:12.5px;font-weight:600;color:var(--ink-muted)}.hp-badges{display:flex;flex-wrap:wrap;gap:9px}.hp-badge{font-size:12.5px;font-weight:700;padding:7px 14px;border-radius:var(--radius-pill);background:var(--surface-card);border:1px dashed var(--line-strong);color:var(--ink-muted)}.hp-badge.earned{background:var(--brand-orange-soft);border:1px solid var(--brand-orange-tint);color:var(--brand-orange-ink)}.hp-note{margin:18px 0 0;font-size:12.5px;color:var(--ink-muted)}.table-section{background:var(--surface-sunken);border-bottom:1px solid var(--line);padding:56px 0 68px}.table-section-inner{max-width:var(--content-max);margin:0 auto;padding:0 22px}.table-count{text-align:right;flex:none}.table-count b{font-family:var(--font-display);font-weight:400;font-size:2rem;color:var(--ink-primary);display:block;line-height:1}.table-count span{font-size:12.5px;font-weight:600;color:var(--ink-muted)}.table-controls{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:16px}.table-search{flex:1;min-width:220px;max-width:420px;display:flex;align-items:center;gap:10px;height:46px;padding:0 14px;background:var(--surface-card);border:1px solid var(--line-strong);border-radius:var(--radius-pill);color:var(--ink-muted);transition:border-color .15s,box-shadow .15s}.table-search:focus-within{border-color:var(--brand-orange);box-shadow:0 0 0 3px #f9731624}.table-search input{flex:1;min-width:0;border:0;outline:0;background:transparent;font-size:15px}.search-clear{border:0;background:var(--surface-sunken);color:var(--ink-secondary);width:24px;height:24px;border-radius:50%;font-size:11px;display:grid;place-items:center}.ctl-select{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--ink-muted)}.ctl-select select{border:1px solid var(--line-strong);background:var(--surface-card);border-radius:var(--radius-pill);padding:10px 14px;font-size:13.5px;font-weight:600;color:var(--ink-primary);cursor:pointer}.legend-row{display:flex;align-items:center;gap:14px;margin:4px 0 20px;flex-wrap:wrap}.legend-title{font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--ink-muted)}:lang(bn) .legend-title{letter-spacing:0;text-transform:none}.legend-chips{display:flex;gap:8px;flex-wrap:wrap}.legend-chip{font-size:12.5px;font-weight:700;padding:7px 14px;border-radius:var(--radius-pill);background:var(--surface-card);border:1px solid var(--line);color:var(--ink-secondary);transition:all .15s}.legend-chip:not(.active):hover{border-color:var(--line-strong);color:var(--ink-primary)}.legend-chip.active{background:var(--cat-soft, var(--brand-orange-soft));border-color:var(--cat, var(--brand-orange));color:var(--ink-primary)}.table-empty{text-align:center;padding:46px 20px;background:var(--surface-card);border:1px dashed var(--line-strong);border-radius:var(--radius-md);margin-bottom:22px}.table-empty p{margin:0 0 16px;color:var(--ink-secondary);font-weight:600}.table-scroll{overflow-x:auto;padding-bottom:8px;-webkit-overflow-scrolling:touch}.swipe-hint{display:none;margin:0 0 8px;font-size:12px;font-weight:600;color:var(--ink-muted)}.ptable{display:grid;grid-template-columns:repeat(18,minmax(58px,1fr));gap:7px;min-width:1180px}.ptable-gap{min-height:58px}.tile{position:relative;display:flex;flex-direction:column;padding:7px 7px 6px;min-height:78px;background:var(--cat-soft);border:1px solid var(--line);border-top:3px solid var(--cat);border-radius:var(--radius-sm);filter:saturate(.72);transition:transform .14s,box-shadow .14s,opacity .14s,filter .14s}.tile:hover,.tile:focus-visible{transform:translateY(-3px);box-shadow:var(--shadow-card);border-color:var(--cat);filter:none;z-index:2}.tile[data-dim]{opacity:.22;filter:grayscale(.6)}.tile[data-dim]:hover{opacity:.75}.tile-z{font-size:10px;font-weight:700;color:var(--cat);line-height:1.2}.tile-sym{font-size:17px;font-weight:800;letter-spacing:-.01em;color:var(--ink-primary);line-height:1.15;margin-top:1px}.tile-name{font-size:10px;color:var(--ink-secondary);line-height:1.2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tile-w{font-family:var(--font-mono);font-size:9.5px;color:var(--ink-muted);margin-top:auto}:lang(bn) .tile-name{font-size:10.5px}.fblock{min-width:1180px;margin-top:14px;display:flex;flex-direction:column;gap:8px}.fblock-row{display:flex;align-items:stretch;gap:10px}.fblock-label{flex:none;width:86px;display:grid;place-items:center;font-size:11px;font-weight:700;text-align:center;color:var(--ink-secondary);line-height:1.3}.fblock-cells{display:flex;gap:7px;flex:1}.tile-sm{flex:1;min-height:58px;min-width:0;display:flex;flex-direction:column;justify-content:center;padding:5px 6px}.sheet-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#1c191770;display:flex;align-items:flex-end;justify-content:center;animation:fadeIn .18s ease}@keyframes fadeIn{0%{opacity:0}}.sheet{position:relative;width:min(560px,100%);background:var(--surface-card);border-radius:var(--radius-lg) var(--radius-lg) 0 0;padding:26px 26px 30px;box-shadow:var(--shadow-lift);animation:slideUp .22s ease;max-height:86vh;overflow-y:auto}@keyframes slideUp{0%{transform:translateY(24px);opacity:0}}.sheet-close{position:absolute;top:14px;right:14px;width:34px;height:34px;border-radius:50%;border:0;background:var(--surface-sunken);color:var(--ink-secondary);font-size:13px}.sheet-close:hover{background:var(--line)}.preview-card{--cat: var(--brand-orange);--cat-soft: var(--brand-orange-soft)}.preview-head{display:flex;gap:18px;align-items:center;margin-bottom:14px}.preview-identity{flex:none;width:92px;height:92px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--cat-soft);border:1px solid var(--line);border-top:4px solid var(--cat);border-radius:var(--radius-md)}.preview-z{font-size:12px;font-weight:700;color:var(--cat)}.preview-identity strong{font-size:30px;font-weight:800;letter-spacing:-.02em}.preview-head h3{margin:0 0 4px;font-family:var(--font-display);font-weight:400;font-size:1.5rem;line-height:1.1}.preview-cat{font-size:12.5px;font-weight:700;color:var(--ink-muted);text-transform:uppercase;letter-spacing:.04em}:lang(bn) .preview-cat{text-transform:none;letter-spacing:0}.preview-hook{font-family:var(--font-serif-body);font-size:15.5px;line-height:1.6;color:var(--ink-secondary);margin:0 0 16px}:lang(bn) .preview-hook{font-family:var(--font-bn-body)}.preview-facts{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap}.preview-facts>div{flex:1;min-width:120px;background:var(--surface-sunken);border-radius:var(--radius-sm);padding:10px 14px;display:flex;flex-direction:column}.preview-facts span{font-size:11.5px;font-weight:600;color:var(--ink-muted)}.preview-facts b{font-size:15px;font-weight:800}.preview-open{width:100%}.learn-section{max-width:var(--content-max);margin:0 auto;padding:84px 22px 96px}.learn-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.learn-card{position:relative;display:flex;flex-direction:column;gap:7px;background:transparent;border:1px solid var(--line);border-radius:var(--radius-md);padding:20px;box-shadow:none;transition:border-color .16s,background .16s}.learn-card:hover{border-color:var(--line-strong);background:var(--surface-card)}.learn-card-n{font-family:var(--font-mono);font-size:11.5px;font-weight:600;color:var(--ink-muted)}.learn-card b{font-size:1.02rem;font-weight:800;letter-spacing:-.01em}.learn-card p{margin:0;font-size:13.5px;color:var(--ink-secondary);flex:1}.learn-card em{font-style:normal;color:var(--brand-orange-deep);font-weight:700;transition:transform .15s}.learn-card:hover em{transform:translate(4px)}.element-page{background:var(--surface-bg)}.el-hero{display:flex;gap:26px;align-items:center;flex-wrap:wrap;background:var(--surface-card);border:1px solid var(--line);border-left:5px solid var(--cat);border-radius:var(--radius-md);padding:24px 28px;margin-bottom:18px;box-shadow:var(--shadow-sm)}.el-identity{flex:none;width:138px;height:138px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--cat-soft);border:1px solid var(--line);border-radius:var(--radius-md);text-align:center;padding:10px}.el-z{font-size:15px;font-weight:800;color:var(--cat)}.el-sym{font-size:44px;font-weight:800;letter-spacing:-.03em;line-height:1.05}.el-name{font-size:12.5px;font-weight:600;color:var(--ink-secondary);line-height:1.25}.el-weight{font-family:var(--font-mono);font-size:11.5px;color:var(--ink-muted);font-style:normal;margin-top:4px}.el-title{flex:1;min-width:260px}.el-photo{flex:none;width:168px;margin:0;text-align:center}.el-photo img{display:block;width:100%;aspect-ratio:1;object-fit:cover;border-radius:var(--radius-md);border:1px solid var(--line);background:var(--surface-sunken)}.el-photo figcaption{margin-top:7px;font-size:11.5px;line-height:1.45;color:var(--ink-muted)}.el-title h1{font-family:var(--font-display);font-weight:400;font-size:clamp(1.9rem,3.6vw,2.7rem);line-height:1.08;margin:10px 0 8px;letter-spacing:-.01em}.el-h1-sym{color:var(--ink-muted);font-size:.62em}.el-hook{font-family:var(--font-serif-body);font-size:1.02rem;color:var(--ink-secondary);margin:0 0 14px;line-height:1.6;max-width:620px}:lang(bn) .el-hook{font-family:var(--font-bn-body)}.el-links{display:flex;gap:16px;flex-wrap:wrap;align-items:center}.el-links a,.el-speak{font-size:13.5px;font-weight:700;color:var(--brand-orange-deep);background:none;border:0;padding:0}.el-links a:hover,.el-speak:hover{text-decoration:underline}.el-facts{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin-bottom:26px}.el-facts>div{background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;display:flex;flex-direction:column;gap:2px}.el-facts span{font-size:11px;font-weight:600;color:var(--ink-muted);letter-spacing:.02em}.el-facts b{font-size:15.5px;font-weight:800}.el-columns{display:grid;grid-template-columns:minmax(0,1fr) 350px;gap:22px;align-items:start}.el-main{display:flex;flex-direction:column;gap:22px;min-width:0}.el-side{display:flex;flex-direction:column;gap:22px;position:sticky;top:calc(var(--header-h) + 14px)}.content-card{background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-md);padding:26px 28px;box-shadow:var(--shadow-sm)}.content-card h2,.side-card h2{font-family:var(--font-display);font-weight:400;font-size:var(--text-h2);line-height:1.2;margin:12px 0 16px}.split-card{display:grid;grid-template-columns:1.4fr 1fr;gap:26px}.config-code{font-family:var(--font-mono);font-size:1.06rem;font-weight:500;background:var(--ink-primary);color:#fdf5ec;border-radius:var(--radius-sm);padding:15px 20px;display:inline-block;letter-spacing:.01em;margin-bottom:18px}.shells{display:flex;flex-direction:column;gap:9px;max-width:560px}.shell-row{display:flex;align-items:center;gap:12px}.shell-row>span{flex:none;width:76px;font-size:12.5px;font-weight:600;color:var(--ink-secondary)}.shell-track{flex:1;height:10px;background:var(--surface-sunken);border-radius:var(--radius-pill);overflow:hidden}.shell-track i{display:block;height:100%;background:linear-gradient(90deg,var(--brand-orange),var(--brand-orange-deep));border-radius:inherit}.shell-row b{font-size:13px;font-weight:800;flex:none;width:42px;text-align:right}.shell-row b small{font-weight:600;color:var(--ink-muted)}.card-note{margin:18px 0 0;font-size:13px;color:var(--ink-muted)}.check-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.check-list li{position:relative;padding-left:26px;font-size:14.5px;color:var(--ink-secondary);line-height:1.65}.check-list li:before{content:"✓";position:absolute;left:0;top:0;color:var(--brand-orange-deep);font-weight:800;font-size:14px}.use-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}.use-grid h3{margin:0 0 14px;font-size:14px;font-weight:800;color:var(--ink-primary)}.appearance-panel{background:var(--cat-soft, var(--brand-orange-soft));border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 20px;align-self:start}.appearance-panel span{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--brand-orange-ink)}:lang(bn) .appearance-panel span{text-transform:none;letter-spacing:0}.appearance-panel p{margin:10px 0 0;font-size:14px;line-height:1.65;color:var(--ink-secondary)}.large-copy{font-family:var(--font-serif-body);font-size:1.02rem;line-height:1.75;color:var(--ink-secondary);margin:0}:lang(bn) .large-copy{font-family:var(--font-bn-body)}.name-origin{margin-top:20px;display:flex;flex-direction:column;gap:3px;background:var(--surface-sunken);border-radius:var(--radius-sm);padding:14px 18px}.name-origin span{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-muted)}:lang(bn) .name-origin span{text-transform:none;letter-spacing:0}.name-origin b{font-size:14.5px}.side-card{background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-md);padding:22px 24px;box-shadow:var(--shadow-sm)}.exam-hint{margin:-6px 0 14px;font-size:13px;color:var(--ink-muted)}.exam-list{display:flex;flex-direction:column}.exam-list details{border-top:1px solid var(--line)}.exam-list details:last-child{border-bottom:1px solid var(--line)}.exam-list summary{list-style:none;display:flex;gap:12px;align-items:flex-start;padding:13px 2px;cursor:pointer;font-size:13.5px;line-height:1.5;color:var(--ink-secondary);font-weight:500}.exam-list summary::-webkit-details-marker{display:none}.exam-list summary:after{content:"+";margin-left:auto;font-weight:700;color:var(--brand-orange-deep);font-size:16px;line-height:1.3}.exam-list details[open] summary:after{content:"–"}.q-n{flex:none;width:22px;height:22px;margin-top:1px;display:grid;place-items:center;background:var(--brand-orange-soft);color:var(--brand-orange-ink);border-radius:7px;font-size:11.5px;font-weight:800}.exam-list details p{margin:0;padding:0 2px 14px 34px;font-size:13px;color:var(--ink-muted)}.exam-list details p.model-answer{color:var(--ink-secondary);line-height:1.65}.ans-label{display:block;margin:0 0 5px;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--brand-orange-deep)}.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.related-grid a{display:flex;flex-direction:column;gap:1px;background:var(--surface-sunken);border-radius:var(--radius-sm);padding:10px 14px;transition:background .15s}.related-grid a:hover{background:var(--brand-orange-soft)}.related-grid b{font-size:15px;font-weight:800}.related-grid span{font-size:11.5px;color:var(--ink-secondary)}.related-grid small{font-size:10.5px;color:var(--ink-muted)}.progress-card .progress-line{margin:4px 0 12px;font-size:13.5px;color:var(--ink-secondary);font-weight:600}.learning-page{background:var(--surface-bg)}.subheading{font-family:var(--font-display);font-weight:400;font-size:var(--text-h2);margin:34px 0 16px}.family-banner{display:flex;align-items:center;gap:26px;background:var(--ink-primary);color:#fdf5ec;border-radius:var(--radius-md);padding:28px 32px;margin:6px 0 22px}.family-banner h2{font-family:var(--font-display);font-weight:400;font-size:1.4rem;margin:4px 0 8px;color:#fff}.family-banner p{margin:0;font-size:14px;color:#d6d0ca;max-width:640px;line-height:1.65}.family-kicker{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--brand-orange)}:lang(bn) .family-kicker{text-transform:none;letter-spacing:0}.family-number{margin-left:auto;font-family:var(--font-display);font-size:4rem;line-height:1;color:#f9731680;flex:none}.period-variant{background:linear-gradient(120deg,var(--ink-primary),#332B25)}.period-pills{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.period-pills a{font-size:12.5px;font-weight:700;color:#fdba74;border:1px solid rgba(249,115,22,.4);border-radius:var(--radius-pill);padding:7px 14px;transition:background .15s}.period-pills a:hover{background:#f9731629}.pos-stats{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:8px}.pos-stats>div{flex:1;min-width:150px;background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 20px;display:flex;flex-direction:column}.pos-stats b{font-family:var(--font-display);font-size:1.7rem;color:var(--brand-orange-deep)}.pos-stats span{font-size:12px;font-weight:600;color:var(--ink-muted)}.member-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}.member-grid a{display:flex;flex-direction:column;gap:2px;background:var(--cat-soft);border:1px solid var(--line);border-top:3px solid var(--cat);border-radius:var(--radius-sm);padding:14px 16px;transition:transform .14s,box-shadow .14s}.member-grid a:hover{transform:translateY(-3px);box-shadow:var(--shadow-card)}.member-grid small{font-size:11px;font-weight:700;color:var(--cat)}.member-grid b{font-size:19px;font-weight:800;letter-spacing:-.01em}.member-grid span{font-size:12.5px;color:var(--ink-secondary);line-height:1.3}.member-grid em{font-style:normal;font-size:11px;color:var(--ink-muted);margin-top:4px}.learning-links{display:flex;gap:22px;flex-wrap:wrap;margin-top:28px}.learning-links a{font-weight:700;font-size:14px;color:var(--brand-orange-deep)}.learning-links a:hover{text-decoration:underline}.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:8px}.tool-card{position:relative;display:flex;flex-direction:column;gap:8px;background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-md);padding:22px;box-shadow:var(--shadow-sm);transition:transform .16s,box-shadow .16s,border-color .16s}.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-card);border-color:var(--brand-orange-tint)}.tool-card b{font-size:1.04rem;font-weight:800}.tool-card p{margin:0;font-size:13.5px;color:var(--ink-secondary);flex:1}.tool-card em{font-style:normal;color:var(--brand-orange-deep);font-weight:700}.rule-card{margin-top:26px;background:var(--brand-orange-soft);border:1px solid var(--brand-orange-tint);border-radius:var(--radius-md);padding:26px 30px}.rule-card b{display:block;font-family:var(--font-display);font-weight:400;font-size:1.25rem;color:var(--brand-orange-ink);margin-bottom:8px}.rule-card p{margin:0;color:var(--ink-secondary);max-width:720px;line-height:1.7}.trend-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 20px}.trend-tabs button{border:1px solid var(--line-strong);background:var(--surface-card);border-radius:var(--radius-pill);padding:10px 18px;font-size:13.5px;font-weight:700;color:var(--ink-secondary);transition:all .15s}.trend-tabs button.active{background:var(--ink-primary);color:#fff;border-color:var(--ink-primary)}.trend-card{display:grid;grid-template-columns:1.2fr 1fr;gap:30px;background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-md);padding:28px 30px;box-shadow:var(--shadow-sm)}.trend-card h2{font-family:var(--font-display);font-weight:400;font-size:var(--text-h2);margin:12px 0 18px;line-height:1.25}.trend-directions{display:flex;flex-direction:column;gap:12px;margin-bottom:18px}.trend-directions>div{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.trend-directions b{font-size:20px;color:var(--accent-blue);flex:none;width:26px}.trend-directions span{font-weight:700;font-size:14px}.trend-directions strong{font-size:13.5px;color:var(--ink-secondary);font-weight:500}.trend-note{margin:0;font-size:13px;color:var(--ink-muted);line-height:1.6}.trend-map{position:relative;min-height:300px;background:var(--surface-sunken);border-radius:var(--radius-md);border:1px solid var(--line);overflow:hidden}.tm-grid{position:absolute;top:18px;right:18px;bottom:18px;left:18px;display:grid;grid-template-columns:repeat(6,1fr);grid-template-rows:repeat(6,1fr);gap:6px}.tm-grid span{border-radius:5px;background:var(--line);opacity:.55}.tm-label{position:absolute;font-size:11px;font-weight:800;color:var(--accent-blue);text-transform:uppercase;letter-spacing:.06em}.tm-label.tl{top:12px;right:14px}.tm-label.br{bottom:12px;left:14px}.tm-arrow{position:absolute;font-size:26px;font-weight:700;color:var(--accent-blue);opacity:.85}.tm-h{top:50%;left:18px;transform:translateY(-50%)}.tm-v{right:20px;top:18px}.tm-diagonal{position:absolute;width:46%;height:3.5px;border-radius:3px;background:var(--accent-blue);opacity:.85}.tm-diagonal.tr{top:30%;right:14%;transform:rotate(45deg)}.tm-diagonal.bl{top:30%;left:14%;transform:rotate(-45deg)}.trend-explore{margin-top:26px}.trend-explore h2{font-family:var(--font-display);font-weight:400;font-size:var(--text-h2);margin:0 0 16px}.trend-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:8px}.trend-cell{display:flex;flex-direction:column;align-items:center;gap:1px;background:var(--cat-soft);border:1px 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b{font-family:var(--font-display);font-size:1.2rem;color:var(--brand-orange-deep);white-space:nowrap}.quiz-card{background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-md);padding:28px 30px;box-shadow:var(--shadow-sm)}.quiz-kicker{display:block;margin-bottom:10px;font-size:12px;font-weight:700;color:var(--brand-orange-ink)}.quiz-card h2{font-family:var(--font-serif-body);font-weight:500;font-size:1.22rem;line-height:1.55;margin:0 0 20px}:lang(bn) .quiz-card h2{font-family:var(--font-bn-body)}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:12px}.quiz-options button{border:1.5px solid var(--line-strong);background:var(--surface-card);border-radius:var(--radius-sm);padding:16px 18px;font-weight:700;font-size:15px;text-align:left;transition:all .15s}.quiz-options button:not(:disabled):hover{border-color:var(--brand-orange);background:var(--brand-orange-soft)}.quiz-options button.correct{border-color:#16a34a;background:#f0fdf4;color:#14532d}.quiz-options button.wrong{border-color:#dc2626;background:#fef2f2;color:#7f1d1d}.quiz-options button.dim{opacity:.45}.quiz-feedback{margin-top:20px;padding:18px 20px;background:var(--surface-sunken);border-radius:var(--radius-sm);display:flex;align-items:center;gap:16px;flex-wrap:wrap}.quiz-feedback b{font-size:14.5px}.quiz-feedback a{font-size:13.5px;font-weight:700;color:var(--brand-orange-deep);flex:1}.quiz-feedback .btn{padding:11px 20px;font-size:.88rem}.quiz-model-answer{flex-basis:100%;margin:2px 0 0;padding:12px 16px;background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-sm);font-size:13.5px;line-height:1.7;color:var(--ink-secondary)}.quiz-model-answer .ans-label{color:var(--brand-orange-deep)}.quiz-actions{display:flex;gap:14px;flex-wrap:wrap}.challenge-card{max-width:620px;background:var(--surface-card);border:1px solid var(--line);border-radius:var(--radius-md);padding:28px 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span{font-size:14px;color:var(--ink-secondary)}.challenge-input{display:flex;gap:10px;margin-bottom:18px}.challenge-input input{flex:1;min-width:0;height:48px;border:1.5px solid var(--line-strong);border-radius:var(--radius-sm);padding:0 16px;font-size:15px;font-weight:600}.challenge-input input:focus{outline:none;border-color:var(--brand-orange);box-shadow:0 0 0 3px #f9731624}.challenge-input button{border:0;background:var(--ink-primary);color:#fff;border-radius:var(--radius-sm);padding:0 22px;font-weight:700;font-size:14px}.challenge-restart{margin-bottom:12px}.challenge-over{text-align:center;padding:8px 0 16px}.challenge-over b{font-family:var(--font-display);font-size:1.4rem;font-weight:400}.challenge-over p{margin:6px 0 0;color:var(--ink-secondary);font-weight:600}.challenge-start{width:100%}.random-card{display:flex;gap:26px;align-items:center;flex-wrap:wrap;background:var(--surface-card);border:1px solid var(--line);border-left:5px solid 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em{position:absolute;right:18px;bottom:14px;font-style:normal;color:var(--brand-orange);font-weight:700}.guide-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-card);border-color:var(--brand-orange-tint)}.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:10px;margin-top:18px}.category-chip{display:flex;align-items:center;gap:9px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-pill);background:var(--cat-soft);text-decoration:none;font-size:.86rem;font-weight:600;color:var(--ink-primary);transition:transform .15s ease,box-shadow .15s ease}.category-chip i{width:11px;height:11px;border-radius:50%;background:var(--cat);flex:none}.category-chip:hover{transform:translateY(-2px);box-shadow:var(--shadow-card)}.category-lede{max-width:720px}.explainer-article{display:flex;flex-direction:column;gap:16px;margin-top:22px;max-width:780px}.explainer-loading{min-height:900px;align-items:flex-start;padding-top:20px}.explainer-article .content-card p{margin:12px 0 0}.related-card{margin-top:22px;max-width:780px}.explainer-page .related-grid{margin-top:14px}.help-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:20px}.help-grid .content-card h2{margin-bottom:8px}.help-page .content-card{margin-top:16px}@media (max-width: 900px){.help-grid,.guide-grid{grid-template-columns:1fr}}.crumbs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.85rem;color:var(--ink-secondary);margin-bottom:18px}.crumbs a{color:var(--ink-secondary);border-bottom:1px solid var(--line-soft)}.crumbs a:hover{color:var(--brand-orange-deep);border-color:var(--brand-orange)}.crumbs b{color:var(--ink-primary);font-weight:600}.quick-answer{position:relative;margin:4px 0 26px;padding:20px 22px 20px 24px;background:var(--surface-card);border:1px solid var(--line-soft);border-left:4px solid var(--brand-orange);border-radius:var(--radius-md);box-shadow:0 1px 2px #1c19170a}.quick-answer .qa-label{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand-orange-deep);margin-bottom:6px}.quick-answer p{margin:0;font-size:1.06rem;line-height:1.6}.facts-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:22px;align-items:start}.facts-intro{font-size:1.02rem;color:var(--ink-secondary);margin:0 0 18px}.facts-side{display:flex;flex-direction:column;gap:16px;position:sticky;top:84px}.fact-card h3{margin:0 0 10px;font-size:.95rem}.fact-el{display:flex;align-items:center;gap:14px;padding:4px 0 12px;border-bottom:1px solid var(--line-soft);margin-bottom:12px}.fact-el-symbol{font-family:var(--font-display);font-size:1.9rem;color:var(--brand-orange-deep);min-width:52px;text-align:center}.fact-el small{display:block;color:var(--ink-secondary);font-size:.8rem}.fact-dl{margin:0;display:grid;grid-template-columns:1fr 1fr;gap:10px}.fact-dl>div{background:var(--surface-sunken, #F5F5F4);border-radius:var(--radius-sm);padding:8px 10px}.fact-dl dt{font-size:.72rem;color:var(--ink-secondary);text-transform:uppercase;letter-spacing:.05em}.fact-dl dd{margin:2px 0 0;font-weight:700;font-size:.95rem;overflow-wrap:anywhere}.fact-links{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.fact-links a{display:block;padding:8px 12px;border:1px solid var(--line-soft);border-radius:var(--radius-sm);font-size:.9rem;background:var(--surface-card)}.fact-links a:hover{border-color:var(--brand-orange);color:var(--brand-orange-deep)}.facts-uses{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:10px}.facts-uses li::marker{color:var(--brand-orange)}.pair-tiles{display:flex;align-items:center;gap:18px;margin-bottom:14px}.pair-tile{display:flex;flex-direction:column;align-items:center;gap:4px;min-width:116px;padding:14px 18px;background:var(--surface-card);border:1px solid var(--line-soft);border-radius:var(--radius-md);transition:border-color .15s,transform .15s}.pair-tile:hover{border-color:var(--brand-orange);transform:translateY(-2px)}.pt-symbol{font-family:var(--font-display);font-size:2.1rem;color:var(--brand-orange-deep)}.pt-name{font-weight:600;font-size:.9rem}.pair-vs{font-family:var(--font-display);font-style:italic;color:var(--ink-secondary);font-size:1.2rem}.pair-hero h1 em{color:var(--brand-orange-deep)}.pair-table th[scope=row]{text-align:left;font-weight:600}.verdicts{list-style:none;margin:0 0 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span{color:var(--ink-secondary);font-size:.8rem}.calc-card{display:flex;flex-direction:column;gap:14px}.calc-label{font-weight:700;font-size:.95rem}.calc-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.calc-input{flex:1;min-width:220px;padding:13px 16px;font-size:1.15rem;font-family:var(--font-mono);background:var(--surface-card);border:1.5px solid var(--line-soft);border-radius:var(--radius-md)}.calc-input:focus{outline:none;border-color:var(--brand-orange);box-shadow:0 0 0 3px #f9731626}.calc-error{color:#b91c1c;background:#fef2f2;border:1px solid #FECACA;padding:10px 14px;border-radius:var(--radius-sm)}.mass-display{display:flex;align-items:baseline;gap:18px;flex-wrap:wrap;padding:18px 20px;background:var(--surface-sunken, #F5F5F4);border-radius:var(--radius-md)}.mass-formula{font-family:var(--font-mono);font-size:1.5rem;font-weight:600}.mass-value{font-family:var(--font-display);font-size:2rem;color:var(--brand-orange-deep)}.mass-value 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.tile[data-dim]{opacity:.2;filter:none}.fs-scale-wrap.fs-on{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.tile-photo-img{image-rendering:auto}input[type=range]{accent-color:var(--brand-orange)}@media (max-width: 767.98px){.table-controls .ctl-select{grid-row:auto}.ctl-chips{grid-column:span 4;display:grid;grid-template-columns:repeat(4,1fr);gap:5px;align-self:stretch}.ctl-chip{width:100%;height:38px;justify-content:center;padding:0 4px;font-size:11px;gap:4px}.ctl-chip .ctl-chip-label{display:none}.heat-legend{gap:8px}.heat-ramp{width:90px}.temp-panel,.tl-panel{padding:10px 12px;gap:9px}.temp-presets button{padding:5px 9px;font-size:11.5px}.tl-read b{font-size:1.2rem}.tl-play{width:38px;height:38px}.fs-modes .ctl-chip{height:32px;padding:0 9px;font-size:11.5px}.fs-mode-view,.fs-mode-prop{height:32px;font-size:11.5px;padding:0 10px}.fs-strip{gap:8px}.fs-strip-value{min-width:42px;font-size:12px}.fs-strip-sub{min-width:34px;font-size:11px}.preview-photo-wrap{height:132px}.preview-bohr-svg{width:66px;height:66px}}@media (max-width: 420px){.ctl-chip{font-size:0;gap:0}.ctl-chip span:first-child{font-size:15px}.fs-modes .ctl-chip{font-size:11px}}@media (max-width: 767.98px),(max-height: 500px){.fs-modes .ctl-chip{height:30px}.fs-mode-view,.fs-mode-prop{height:30px;font-size:11.5px}.fs-tl-play{width:28px;height:28px}}[data-theme=dark]{--surface-bg: #131110;--surface-card: #1D1A18;--surface-sunken: #262220;--surface-hero: #191512;--ink-primary: #F5F4F2;--ink-secondary: #C7C2BB;--ink-muted: #9B948C;--line: #35302B;--line-strong: #4A423B;--line-soft: #2B2723;--brand-orange-soft: #33200F;--brand-orange-tint: #452A13;--brand-orange-ink: #FDBA74;--accent-blue-soft: #17233C;--cat-alkali-soft: color-mix(in srgb, #DC2626 24%, #1D1A18);--cat-alkaline-soft: color-mix(in srgb, #A16207 26%, #1D1A18);--cat-transition-soft: color-mix(in srgb, #0284C7 24%, #1D1A18);--cat-post-transition-soft: color-mix(in srgb, #0D9488 24%, #1D1A18);--cat-metalloid-soft: color-mix(in srgb, #65A30D 24%, #1D1A18);--cat-nonmetal-soft: color-mix(in srgb, #16A34A 24%, #1D1A18);--cat-halogen-soft: color-mix(in srgb, #7C3AED 26%, #1D1A18);--cat-noble-soft: color-mix(in srgb, #A21CAF 26%, #1D1A18);--cat-lanthanide-soft: color-mix(in srgb, #DB2777 24%, #1D1A18);--cat-actinide-soft: color-mix(in srgb, #9F1239 26%, #1D1A18);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .4), 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 10px 30px rgba(0, 0, 0, .45);--shadow-card: 0 2px 6px rgba(0, 0, 0, .35), 0 14px 34px rgba(0, 0, 0, .4);--shadow-lift: 0 16px 40px rgba(0, 0, 0, .6);color-scheme:dark}[data-theme=dark] body{background:var(--surface-bg);color:var(--ink-primary)}[data-theme=dark] .site-header{background:#131110e6}[data-theme=dark] .hero{background:radial-gradient(60% 90% at 50% -10%,#f9731624,#f9731600 62%),var(--surface-hero)}[data-theme=dark] .ht{background:#1d1a18bf}[data-theme=dark] .header-search kbd{background:var(--surface-sunken);color:var(--ink-muted);border-color:var(--line)}[data-theme=dark] .sheet-backdrop{background:#0000009e}[data-theme=dark] .quiz-options button.correct{background:#0e2a1b;color:#86efac;border-color:#16a34a}[data-theme=dark] .quiz-options button.wrong{background:#331515;color:#fca5a5;border-color:#dc2626}[data-theme=dark] .calc-error{background:#331515;border-color:#7f1d1d;color:#fca5a5}[data-theme=dark] .quote-card{background:var(--brand-orange-soft);border-color:#6b3a17}[data-theme=dark] .lazy-loading{background:linear-gradient(100deg,var(--surface-sunken) 40%,#2E2926 50%,var(--surface-sunken) 60%);background-size:200% 100%}[data-theme=dark] .lab-stage{background:linear-gradient(180deg,#201c19,#171412)}[data-theme=dark] .burner-stem{background:linear-gradient(180deg,#78716c,#57534e)}[data-theme=dark] .table-section:fullscreen,[data-theme=dark] .table-section.fs-on{background:var(--surface-bg)}[data-theme=dark] .ptable-title{background:radial-gradient(120% 140% at 50% 0%,#f973161a,#f9731600 60%),var(--surface-card)}[data-theme=dark] .tile-photo-img{filter:saturate(.92) brightness(.94)}[data-theme=dark] .pdf-card{background:var(--surface-card)}[data-theme=dark] .theme-pop,[data-theme=dark] .login-pop{background:var(--surface-card);border-color:var(--line-strong)}[data-theme=dark] .calc-status.tone-green{background:#0e2a1b;color:#86efac;border-color:#1d5c3c}[data-theme=dark] .calc-status.tone-red{background:#331515;color:#fca5a5;border-color:#7f1d1d}[data-theme=dark] .calc-status.tone-amber{background:#332411;color:#fcd34d;border-color:#7a5416}[data-theme=dark] .calc-error-card{background:#331515;border-color:#7f1d1d;color:#fca5a5}[data-theme=dark] .dym-btn{background:#201c19;border-color:#7f1d1d;color:#fca5a5}[data-theme=dark] .dym-btn:hover{background:#3d1c1c}[data-theme=dark] .hazard-chip{background:#332411;color:#fcd34d;border-color:#7a5416}[data-theme=dark] .hazard-label{color:#fcd34d}[data-theme=dark] .calc-suggest{background:var(--surface-card)}[data-theme=dark] .el-photo img{filter:saturate(.95) brightness(.95)}