:root{
  --bg:#eef2ff; --surface:#fff; --surface-soft:#f6f8ff; --ink:#1f2937; --heading:#312e81;
  --muted:#475569; --border:#c7d2fe; --primary:#4f46e5; --primary-dark:#4338ca; --on-primary:#fff;
  --secondary:#818cf8; --accent:#15803d; --accent-soft:#dcfce7; --danger:#dc2626;
  --shadow-soft:0 10px 30px rgba(49,46,129,.08); --shadow-hover:0 18px 40px rgba(49,46,129,.14);
  --radius-sm:10px; --radius:18px; --radius-lg:24px; --container:1180px; --nav-height:72px; --focus-ring:#0B1220;
  color-scheme:light;
}
[data-theme="dark"]{
  --bg:#070b19; --surface:#101733; --surface-soft:#151d3c; --ink:#e5e9ff; --heading:#dbe0ff;
  --muted:#a5b0cf; --border:#2b3768; --primary:#8f9dff; --primary-dark:#aab4ff; --on-primary:#0b1020;
  --secondary:#64748b; --accent:#4ade80; --accent-soft:#123527; --danger:#f87171;
  --shadow-soft:0 12px 32px rgba(2,6,23,.35); --shadow-hover:0 18px 42px rgba(2,6,23,.48); --focus-ring:#F8FAFC;
}
*,*::before,*::after{box-sizing:border-box}
html{min-width:320px;background:var(--bg);scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-height) + 14px)}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important}
}
body{margin:0;min-height:100vh;color:var(--ink);background:
radial-gradient(circle at top right,rgba(129,140,248,.22),transparent 28rem),
radial-gradient(circle at bottom left,rgba(22,163,74,.13),transparent 26rem),var(--bg);
font-family:"Noto Sans Bengali","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:17px;line-height:1.72;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{color:var(--heading);line-height:1.25;margin:.2em 0 .45em;letter-spacing:-.02em}
h1{font-size:clamp(2rem,5vw,3.55rem);font-weight:800}
h2{font-size:clamp(1.45rem,3vw,2.05rem)}
h3{font-size:1.15rem;margin-top:0}
p{margin:.25em 0 .9em}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark)}
img,svg{max-width:100%}
svg{width:20px;height:20px;vertical-align:middle}
.container{width:min(var(--container),calc(100% - 36px));margin-inline:auto}
.narrow{max-width:900px}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;left:16px;top:-80px;z-index:1000;padding:11px 18px;background:var(--primary);color:var(--on-primary);border-radius:999px;font-weight:700;transition:top .2s ease-out}
.skip-link:focus{top:14px}
:focus-visible{outline:3px solid var(--focus-ring);outline-offset:3px;border-radius:6px}

.site-header{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(14px) saturate(1.3);border-bottom:1px solid var(--border)}
.header-grid{display:flex;align-items:center;gap:16px;min-height:var(--nav-height)}
.brand{display:inline-flex;align-items:center;gap:11px;color:var(--heading);min-width:0}
.brand strong,.brand small{display:block;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand strong{font-size:1rem;font-weight:800}
.brand small{font-family:"Outfit",sans-serif;font-size:.68rem;color:var(--muted);text-transform:uppercase;letter-spacing:.09em}
.brand-mark{display:grid;place-items:center;width:43px;height:43px;border-radius:14px;color:#fff;background:linear-gradient(135deg,var(--primary),#767bff);box-shadow:0 7px 18px rgba(79,70,229,.25);font-family:"Noto Sans SC",sans-serif;font-weight:700;font-size:1.35rem;flex:none}
.main-nav{display:flex;align-items:center;justify-content:center;flex:1;min-width:0}
.main-nav a{padding:8px 11px;border-radius:999px;color:var(--ink);font-size:.94rem;font-weight:600;transition:background .2s,color .2s,transform .2s}
.main-nav a:hover{color:var(--primary-dark);background:var(--surface-soft);transform:translateY(-1px)}
.main-nav a[aria-current="page"]{background:var(--primary);color:var(--on-primary)!important}
.header-actions{display:flex;align-items:center;gap:8px;margin-left:auto}
.icon-button{display:grid;place-items:center;width:44px;height:44px;border:0;border-radius:14px;color:var(--heading);background:var(--surface-soft);cursor:pointer;transition:background .2s,transform .2s,color .2s}
.icon-button:hover{color:var(--primary-dark);transform:translateY(-1px)}
.nav-toggle{display:none}
.search-panel{padding:14px 0 20px;border-top:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow-soft)}
#global-search{width:min(760px,100%);margin:auto;display:block;padding:15px 18px;border:2px solid var(--border);border-radius:16px;background:var(--surface);color:var(--ink);font:inherit}
.search-results{position:relative;width:min(760px,100%);margin:8px auto 0;display:grid;gap:6px}
.search-result-item{display:flex;justify-content:space-between;gap:16px;padding:11px 14px;background:var(--surface-soft);border:1px solid var(--border);border-radius:14px;color:var(--ink)!important}
.search-result-item:hover{transform:translateY(-1px);box-shadow:var(--shadow-soft)}
.result-main strong{font-family:"Noto Sans SC";font-size:1.1rem}
.result-sub{display:block;color:var(--muted);font-size:.85rem}
.result-type{display:block;font-size:.78rem;color:var(--accent);font-weight:700;text-transform:uppercase}
.search-empty{margin:8px;color:var(--muted);text-align:center}

.hero{padding:64px 0 52px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,.78fr);gap:44px;align-items:start}
.hero-badge,.eyebrow{font-family:"Outfit",sans-serif;font-size:.78rem;font-weight:700;color:var(--primary);text-transform:uppercase;letter-spacing:.13em}
.hero h1 span{display:block;font-size:.58em;color:transparent;-webkit-text-stroke:1.5px var(--primary);text-stroke:1.5px var(--primary)}
.hero-text{max-width:640px;color:var(--muted);font-size:1.08rem}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:47px;padding:12px 21px;border:2px solid transparent;border-radius:999px;font:inherit;font-weight:700;cursor:pointer;transition:transform .2s ease-out,box-shadow .2s,background .2s,color .2s,border-color .2s}
.button.primary{background:linear-gradient(135deg,var(--primary),#6366f1);color:#fff;box-shadow:0 12px 24px rgba(79,70,229,.22)}
[data-theme="dark"] .button.primary{color:var(--on-primary)}
.button.outline{border-color:var(--primary);color:var(--primary)!important;background:transparent}
.button.ghost{background:var(--surface);border-color:var(--border);color:var(--heading)!important;box-shadow:var(--shadow-soft)}
.button.large{min-width:220px;min-height:54px;font-size:1.04rem}
.button:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.stat-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:30px 0 0;padding:0;list-style:none}
.stat-row div{padding:14px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);text-align:center;box-shadow:var(--shadow-soft)}
.stat-row dt{font-size:1.35rem;font-weight:800;color:var(--heading)}
.stat-row dd{margin:0;color:var(--muted);font-size:.78rem}
.hero-panel{padding:24px;background:linear-gradient(145deg,var(--surface),var(--surface-soft));border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-hover)}
.hero-word{position:relative;display:grid;gap:3px;padding:22px;margin:16px 0;background:var(--surface);border-radius:var(--radius);border:1px solid var(--border)}
.hero-word strong{font-family:"Noto Sans SC";font-size:2.6rem;color:var(--heading)}
.hero-word span{color:var(--primary);font-weight:600}
.hero-word .audio-button{position:absolute;top:16px;right:16px}
.progress-note{padding:14px;background:var(--accent-soft);border-left:4px solid var(--accent);border-radius:10px;color:#14532d;font-size:.95rem}
[data-theme="dark"] .progress-note{color:var(--accent)}

.section{padding:56px 0}
.section.soft{background:color-mix(in srgb,var(--surface-soft) 82%,transparent);border-block:1px solid var(--border)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:28px}
.section-head p{max-width:660px;color:var(--muted)}
.text-link{font-weight:700;white-space:nowrap}
.quick-grid,.card-grid,.topic-grid,.tool-grid,.target-grid,.level-grid{display:grid;gap:16px}
.quick-grid{grid-template-columns:repeat(auto-fit,minmax(165px,1fr))}
.card-grid{grid-template-columns:repeat(auto-fill,minmax(215px,1fr))}
.topic-grid,.tool-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.level-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.quick-card,.card,.topic-card,.tool-card,.level-card{position:relative;display:flex;flex-direction:column;justify-content:center;min-height:130px;padding:20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--ink)!important;box-shadow:var(--shadow-soft);overflow:hidden;transition:transform .22s ease-out,box-shadow .22s,border-color .22s}
.quick-card svg,.topic-card::before{color:var(--primary)}
.quick-card svg{width:30px;height:30px;margin-bottom:12px}
.quick-card strong,.topic-card strong,.tool-card strong{color:var(--heading);font-size:1.06rem}
.quick-card span,.topic-card span,.tool-card span{color:var(--muted);font-size:.92rem}
.quick-card:hover,.card:hover,.topic-card:hover,.tool-card:hover,.level-card:hover{transform:translateY(-5px);border-color:var(--primary);box-shadow:var(--shadow-hover)}
.card-top{font-family:"Noto Sans SC";font-size:1.65rem;font-weight:700;color:var(--heading)}
.card-middle{color:var(--primary);font-weight:600;font-size:.93rem}
.card-bottom{color:var(--ink);font-size:1rem;margin-top:3px}
.topic-card::before{content:"中";position:absolute;right:-8px;bottom:-22px;font-family:"Noto Sans SC";font-size:5.5rem;font-weight:800;opacity:.06}
.topic-card em{position:absolute;top:16px;right:16px;font-style:normal;font-size:.75rem;color:var(--accent);font-weight:700}
.tool-card{min-height:auto}
.level-card{align-items:center;text-align:center}
.level-card span{font-family:"Outfit";font-size:.8rem;font-weight:700;color:var(--primary)}
.level-card strong{font-size:2.2rem;color:var(--heading)}

.page-head{max-width:840px;margin-bottom:28px}
.breadcrumb{display:flex;flex-wrap:wrap;gap:7px;padding-top:22px;font-size:.88rem;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.34fr);gap:26px;padding-block:34px 52px}
.content-card{padding:clamp(22px,4vw,38px);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-soft);margin-bottom:22px}
.lesson-head{display:flex;justify-content:space-between;gap:20px;align-items:start}
.pinyin-inline,.pinyin{font-family:"Outfit","Noto Sans Bengali",sans-serif;color:var(--primary);font-weight:600}
.lead{font-size:1.07rem}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.chip{padding:6px 12px;border-radius:999px;background:var(--surface-soft);border:1px solid var(--border);color:var(--heading);font-size:.83rem;font-weight:700}
.chip-green{background:var(--accent-soft);border-color:#86efac;color:#166534}
[data-theme="dark"] .chip-green{color:var(--accent)}
.example-stack{display:grid;gap:12px;margin:16px 0 26px}
.example-card{padding:16px 18px;background:var(--surface-soft);border-left:4px solid var(--secondary);border-radius:10px}
.example-card p:first-child{margin:0;font-size:1.15rem}
.tip-card{padding:18px;background:#eff6ff;border-left:4px solid #60a5fa;border-radius:10px;color:#1e3a8a}
.warn-card{padding:18px;background:#fef2f2;border-left:4px solid var(--danger);border-radius:10px;color:#991b1b}
[data-theme="dark"] :is(.tip-card,.warn-card){background:var(--surface-soft);color:var(--ink)}
.sidebar{align-self:start;position:sticky;top:calc(var(--nav-height) + 18px)}
.practice-box{text-align:center}
.stack-links{display:grid;gap:10px}
.mini-list{display:grid;gap:8px;margin-top:10px}
.mini-list a{display:flex;justify-content:space-between;gap:10px;padding:10px;border:1px solid var(--border);border-radius:12px;color:var(--ink)!important;background:var(--surface-soft)}
.mini-list strong{font-family:"Noto Sans SC"}
.mini-list span{color:var(--muted);font-size:.9rem}

.audio-button,.copy-button{display:grid;place-items:center;width:44px;height:44px;border:0;border-radius:50%;background:var(--primary);color:#fff;cursor:pointer;transition:transform .2s,background .2s;flex:none}
[data-theme="dark"] :is(.audio-button,.copy-button){color:var(--on-primary)}
.audio-button:hover{transform:scale(1.05);background:var(--primary-dark)}
.phrase-actions{display:flex;align-items:center;gap:10px;margin-top:16px}
.copy-button{width:auto;padding-inline:16px;border-radius:999px;background:var(--accent);font:inherit;font-weight:700;color:#fff}
[data-theme="dark"] .copy-button{color:#052e16}
.conversation-lines{display:grid;gap:12px;margin:22px 0}
.conversation-line{padding:18px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-soft)}
.conversation-line header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.speaker-a{border-left:5px solid var(--primary)}
.speaker-b{border-right:5px solid var(--accent);margin-left:auto;max-width:92%}
.toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:20px}

.character-hero{display:grid;grid-template-columns:auto minmax(0,1fr);gap:26px;align-items:center}
.writer-canvas{width:min(210px,62vw);aspect-ratio:1;margin:auto;display:grid;place-items:center;background:var(--surface-soft);border:2px dashed var(--border);border-radius:20px;cursor:pointer}
.writer-canvas svg{width:100%;height:100%;display:block}
.fact-list{padding-left:20px;color:var(--muted)}
.table-wrap{overflow-x:auto;margin-top:12px}
table{width:100%;border-collapse:collapse;font-size:.95rem}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--border)}
th{color:var(--heading);white-space:nowrap}
.grid-two{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.sound-card{padding:16px;background:var(--surface-soft);border-radius:14px;border:1px solid var(--border)}
.numbered-list{padding-left:20px}
.timeline{display:grid;gap:14px}
.timeline article{display:grid;grid-template-columns:110px minmax(0,1fr);gap:16px;padding-bottom:14px;border-bottom:1px dashed var(--border)}
.timeline span{font-weight:700;color:var(--primary)}

.quiz-shell{margin-top:24px}
.quiz-container{min-height:min(430px,68vh);display:flex;flex-direction:column;justify-content:center}
.test-progress,.quiz-progress{height:8px;margin-bottom:18px;background:var(--surface-soft);border-radius:999px;overflow:hidden}
.quiz-progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .3s ease-out}
.quiz-question{font-family:"Noto Sans SC";font-size:2rem;font-weight:700;color:var(--heading);text-align:center;margin:8px 0}
.quiz-hint{text-align:center;color:var(--muted)}
.quiz-options{display:grid;gap:10px;margin-top:20px}
.quiz-option{min-height:52px;padding:12px;border:2px solid var(--border);border-radius:14px;background:var(--surface-soft);color:var(--ink);font:inherit;font-weight:600;cursor:pointer;text-align:left;transition:transform .18s,border-color .18s,background .18s}
.quiz-option:hover:not(:disabled){transform:translateY(-2px);border-color:var(--primary)}
.quiz-option.correct{background:var(--accent-soft);border-color:var(--accent);color:#166534}
.quiz-option.wrong{background:#fee2e2;border-color:var(--danger);color:#991b1b}
[data-theme="dark"] .quiz-option.correct{color:#bbf7d0}[data-theme="dark"] .quiz-option.wrong{color:#fecaca}
.feedback{min-height:48px;margin-top:14px;padding:12px;border-radius:12px;font-weight:600}
.feedback.good{background:var(--accent-soft);color:#166534}.feedback.bad{background:#fee2e2;color:#991b1b}
[data-theme="dark"] :is(.feedback.good,.feedback.bad){background:var(--surface-soft);color:var(--ink)}
.quiz-result{text-align:center}
.score-circle{width:150px;height:150px;margin:auto;display:grid;place-items:center;border:8px solid var(--accent);border-radius:50%;font-size:1.7rem;font-weight:800;color:var(--heading)}
.related-tools{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:40px}
.related-tools a{padding:8px 14px;border:1px solid var(--border);border-radius:999px;font-size:.9rem;font-weight:600}

.tool-panel{padding:clamp(20px,3vw,28px);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-soft)}
.tool-panel label{display:block;margin-bottom:8px;font-weight:700;color:var(--heading);font-size:.98rem}
.tool-panel input[type="text"],.tool-panel input[type="number"],.tool-panel input[type="search"],.tool-panel input[type="date"]{width:100%;padding:14px 16px;border:2px solid var(--border);border-radius:14px;background:var(--surface-soft);color:var(--ink);font:inherit;transition:border-color .18s,box-shadow .18s}
.tool-panel input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px color-mix(in srgb,var(--primary) 18%,transparent)}
.tool-output{margin-top:16px;display:grid;gap:6px;padding:18px 20px;background:linear-gradient(135deg,var(--surface-soft),color-mix(in srgb,var(--surface) 88%,var(--primary) 6%));border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow-soft)}
.tool-output strong{font-family:"Noto Sans SC","Noto Sans Bengali",sans-serif;font-size:1.45rem;color:var(--heading);word-break:break-word}
.tool-output span{font-family:"Outfit",sans-serif;color:var(--primary);font-weight:600;word-break:break-word}
.tool-output small{color:var(--muted);font-size:.9rem}
.phrase-builder{display:grid;gap:12px}
.phrase-builder label{font-weight:700;color:var(--heading)}
.phrase-builder input{max-width:220px}
.phrase-builder output,.tool-panel output{display:grid}

.ad-slot{width:min(970px,100%);margin:auto;overflow:hidden;text-align:center}
.ad-slot--top{min-height:min(120px,18vh)}
.ad-slot--inline{min-height:min(250px,45vh)}
.ad-slot--footer{min-height:min(110px,16vh)}
@media (max-width:760px){.ad-slot--top{min-height:110px}.ad-slot--inline{min-height:230px}.ad-slot--footer{min-height:100px}}
.ad-slot>ins{width:100%!important}
.section>.container .ad-slot{margin-bottom:10px}
.prose{line-height:1.85}
.center{text-align:center}
.footer-ad-note{font-size:.8rem;color:var(--muted);text-align:center;padding-bottom:10px}

.site-footer{margin-top:56px;background:#0f172a;color:#cbd5e1}
.site-footer a{color:#cbd5e1}
.site-footer a:hover{color:#a5b4fc}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,minmax(150px,1fr));gap:32px;padding:48px 0}
.site-footer .brand{color:#fff}
.site-footer .brand strong{font-size:1.05rem}
.site-footer p{max-width:420px;font-size:.95rem}
.site-footer nav{display:grid;gap:8px;align-content:start}
.site-footer h3{color:#fff;font-size:1rem;margin-bottom:6px}
.footer-bottom{border-top:1px solid rgba(148,163,184,.2);padding:16px 0;font-size:.84rem}
.footer-bottom-inner,.footer-bottom p{margin:0}

@media (max-width:1020px){
  .hero-grid{grid-template-columns:1fr}
  .detail-layout{grid-template-columns:1fr}
  .sidebar{position:static;display:grid;gap:18px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  body{font-size:16px}
  .hero{padding-top:38px}
  .header-grid{grid-template-columns:auto auto;grid-template-areas:"brand actions" "nav nav"}
  .brand{grid-area:brand}.header-actions{grid-area:actions}
  .nav-toggle{display:grid}
  .main-nav{grid-area:nav;display:none;width:100%;flex-direction:column;align-items:stretch;padding-bottom:14px}
  .main-nav.open{display:flex}
  .main-nav a{padding:13px;border-radius:12px}
  .stat-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .section-head{flex-direction:column;align-items:flex-start}
  .character-hero{grid-template-columns:1fr;text-align:center}
  .timeline article{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:22px}
  .lesson-head{flex-direction:row}
}
@media (max-width:380px){
  .cta-row .button{width:100%}
  .brand small{display:none}
}
@media (prefers-reduced-motion:no-preference){
  main>*{animation:page-in .38s ease-out both}
}
@keyframes page-in{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
@media print{.site-header,.site-footer,.ad-slot,.sidebar,#back-to-top{display:none!important}}

#back-to-top:hover{transform:translateY(-2px)!important;box-shadow:var(--shadow-hover);background:var(--surface-soft)}
#back-to-top:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
#back-to-top svg{width:22px;height:22px}

.pwa-status{position:fixed;left:16px;right:16px;bottom:84px;z-index:96;display:flex;align-items:center;justify-content:space-between;gap:12px;width:min(460px,calc(100% - 32px));margin-inline:auto;padding:13px 15px;border:1px solid var(--border);border-radius:16px;background:var(--surface);color:var(--heading);box-shadow:var(--shadow-hover);font-size:.94rem;font-weight:600}
.pwa-status[data-tone="warning"]{border-color:#f59e0b;background:color-mix(in srgb,#fef3c7 88%,var(--surface))}
.pwa-status[data-tone="update"]{border-color:var(--accent);background:var(--surface)}
[data-theme="dark"] .pwa-status[data-tone="warning"]{background:#2c2410;color:#fde68a}
.pwa-status button{min-height:42px;padding:9px 15px;border:0;border-radius:999px;background:var(--primary);color:var(--on-primary);font:inherit;font-weight:700;cursor:pointer}
@media (max-width:520px){.pwa-status{flex-direction:column;align-items:stretch;text-align:center}.pwa-status button{width:100%}}
@media (prefers-reduced-motion:no-preference){.pwa-status{transition:opacity .2s ease-out,transform .2s ease-out}}

.path-filter{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 28px}
.filter-button{min-height:42px;padding:9px 16px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--heading);font:inherit;font-weight:600;cursor:pointer}
.filter-button.is-active{background:var(--primary);color:#fff;border-color:var(--primary)}
.filter-button:focus-visible{outline:3px solid var(--focus-ring);outline-offset:3px}
.path-progress-card .path-progress{height:10px;margin:12px 0;background:var(--surface-soft);border-radius:999px;overflow:hidden}
.path-progress-bar{width:0;height:100%;background:linear-gradient(90deg,var(--accent),var(--primary))}
.path-step-control{display:flex;align-items:flex-start;gap:10px;margin-bottom:8px;font-weight:700;color:var(--accent)}
.path-step-control input[type="checkbox"]{width:22px;height:22px;margin:2px 0 0;accent-color:var(--accent)}
.path-card small{display:block;margin-top:auto;color:var(--muted);font-weight:600}
@media (max-width:520px){.filter-button{padding:8px 13px;font-size:.92rem}}

/* === ui-ux-pro-max world-class premium layer === */
:root{--radius-xs:8px;--shadow-card:0 8px 24px rgba(49,46,129,.07);--shadow-elevated:0 18px 44px rgba(49,46,129,.13);--blur-glass:saturate(1.35) blur(16px)}
.hero{position:relative;overflow:hidden;isolation:isolate}
.hero::before{content:'';position:absolute;inset:0;z-index:-1;background:radial-gradient(circle at 18% 18%,rgba(129,140,248,.16),transparent 42%),radial-gradient(circle at 82% 78%,rgba(22,163,74,.11),transparent 38%),linear-gradient(180deg,rgba(255,255,255,.55),transparent 55%);pointer-events:none}

.card,.content-card,.practice-box{transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease,background .22s ease}
.card:hover,.content-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-elevated);border-color:color-mix(in srgb,var(--border) 85%, white)}
.button{transition:transform .18s ease,box-shadow .18s ease,background .18s ease,border-color .18s ease;will-change:transform}
.button:hover{transform:translateY(-1px)}
.button:active{transform:translateY(0) scale(.98)}

.ad-slot{position:relative;background:color-mix(in srgb,var(--surface) 96%, var(--bg));border:1px solid color-mix(in srgb,var(--border) 68%, transparent);border-radius:16px;padding:10px 10px 12px;box-shadow:var(--shadow-soft)}
.ad-slot::before{content:'বিজ্ঞাপন  •  Advertisement';display:block;text-align:center;font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.ad-slot ins{border-radius:10px;overflow:hidden}

.site-header{backdrop-filter:var(--blur-glass);background:color-mix(in srgb,var(--surface) 88%, transparent);border-bottom:1px solid color-mix(in srgb,var(--border) 80%, transparent)}
.brand-mark{box-shadow:0 8px 22px rgba(79,70,229,.28), inset 0 1px 0 rgba(255,255,255,.35)}
.main-nav a{position:relative}
.main-nav a::after{content:'';position:absolute;left:11px;right:11px;bottom:4px;height:2px;background:var(--primary);border-radius:999px;opacity:0;transform:scaleX(.4);transition:opacity .2s ease, transform .2s ease}
.main-nav a:hover::after,.main-nav a[aria-current='page']::after{opacity:.18;transform:scaleX(1)}

h1,h2{letter-spacing:-.025em}
.hero h1 span{background:linear-gradient(135deg,var(--primary),#7c7aff);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-row dt{font-variant-numeric:tabular-nums}
:focus-visible{outline:3px solid var(--focus-ring);outline-offset:3px;border-radius:8px}
@media (prefers-reduced-motion:reduce){.card,.content-card,.button{transition:none}}

.footer-grid a{transition:color .18s ease, transform .18s ease}
.footer-grid a:hover{color:#a5b4fc;transform:translateX(2px)}
.pwa-status{backdrop-filter:blur(12px) saturate(1.2)}
::-selection{background:color-mix(in srgb,var(--primary) 18%, transparent)}

.card,.content-card{content-visibility:auto;contain-intrinsic-size:auto 300px}