:root{--primary:#6556ff;--primary-hover:#5243f0;--primary-soft:#6556ff1f;--primary-soft-hover:#6556ff33;--link:#6556ff;--secondary:#1a21bc;--navy:#222c44;--ink:#434a5c;--muted:#6b7280;--line:#e8ecf4;--bg:#fff;--surface:#fff;--surface-2:#f6faff;--sky:#d5effa;--sky-ink:#3aa0d8;--success:#43c639;--success-ink:#2f9a27;--ok:#2fae5a;--ok-soft:#e6f7ec;--bad:#e5484d;--bad-soft:#fdecec;--notice-bg:#fff8e6;--notice-line:#f5e1a4;--field:#fff;--on-primary:#fff;--swatch-line:#0000001f;--backdrop:linear-gradient(135deg, #d5effa 0%, #cfc9ff 100%);--bar-1:#4bb4e6;--bar-2:#6556ff;--bar-3:#eab308;--bar-4:#43c639;--shadow-sm:0 1px 3px #222c440f;--shadow:0 16px 36px -18px #222c4438;--shadow-lg:0 30px 60px -28px #222c444d;--radius:16px;--radius-lg:24px;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--primary:#7b6dff;--primary-hover:#8f83ff;--primary-soft:#7b6dff29;--primary-soft-hover:#7b6dff42;--link:#a99fff;--secondary:#4b55e6;--navy:#eef0f7;--ink:#c9cdda;--muted:#9198ab;--line:#262c3d;--bg:#0e111b;--surface:#161a27;--surface-2:#121625;--sky:#13233a;--sky-ink:#6cc4f0;--success:#4fd45f;--success-ink:#6fdc7c;--ok:#4cc27a;--ok-soft:#14301f;--bad:#f07070;--bad-soft:#3a1d1f;--notice-bg:#33290f;--notice-line:#6b5a1e;--field:#1b2030;--swatch-line:#ffffff40;--backdrop:linear-gradient(135deg, #17304d 0%, #2a2660 100%);--shadow-sm:0 1px 3px #0006;--shadow:0 16px 36px -18px #0009;--shadow-lg:0 30px 60px -28px #000000b3;color-scheme:dark}}:root[data-theme=dark]{--primary:#7b6dff;--primary-hover:#8f83ff;--primary-soft:#7b6dff29;--primary-soft-hover:#7b6dff42;--link:#a99fff;--secondary:#4b55e6;--navy:#eef0f7;--ink:#c9cdda;--muted:#9198ab;--line:#262c3d;--bg:#0e111b;--surface:#161a27;--surface-2:#121625;--sky:#13233a;--sky-ink:#6cc4f0;--success:#4fd45f;--success-ink:#6fdc7c;--ok:#4cc27a;--ok-soft:#14301f;--bad:#f07070;--bad-soft:#3a1d1f;--notice-bg:#33290f;--notice-line:#6b5a1e;--field:#1b2030;--swatch-line:#ffffff40;--backdrop:linear-gradient(135deg, #17304d 0%, #2a2660 100%);--shadow-sm:0 1px 3px #0006;--shadow:0 16px 36px -18px #0009;--shadow-lg:0 30px 60px -28px #000000b3;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0;font-family:Poppins,system-ui,-apple-system,Segoe UI,Noto Sans,Noto Sans Bengali,Noto Sans Arabic,Hiragino Sans,sans-serif;line-height:1.6}:root[dir=rtl] body{line-height:1.75}h1,h2,h3{color:var(--navy);font-weight:600;line-height:1.2}a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}button{font:inherit}:focus-visible{outline:2px solid var(--primary);outline-offset:2px}:root[data-ui-pending] :is(main,.site-footer,.main-nav,.lang-pill){opacity:0}@view-transition{navigation:auto}.site-header{view-transition-name:site-header}::view-transition-old(root),::view-transition-new(root){animation-duration:.18s}@media (prefers-reduced-motion:reduce){@view-transition{navigation:none}}.container{max-width:1180px;margin:0 auto;padding:0 20px}.page{padding-top:32px;padding-bottom:72px}.muted{color:var(--muted)}.small{font-size:.875rem}.center{text-align:center}.row-center{flex-wrap:wrap;justify-content:center;gap:10px;margin-top:20px;display:flex}.row-between{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;display:flex}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}:root[dir=rtl] :is(.fwd,.back){display:inline-block;transform:scaleX(-1)}.btn{background:var(--primary);color:var(--on-primary);cursor:pointer;border:0;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:12px 26px;font-weight:500;transition:background .15s,transform .1s;display:inline-flex}.btn:hover{background:var(--primary-hover);text-decoration:none}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.5;cursor:default}.btn-ghost{background:var(--primary-soft);color:var(--primary)}.btn-ghost:hover{background:var(--primary-soft-hover)}.btn-round{width:76px;height:76px;padding:0;font-size:2rem}.icon-btn{border:1px solid var(--line);background:var(--surface);width:40px;height:40px;color:var(--navy);cursor:pointer;border-radius:50%;flex-shrink:0;place-items:center;display:inline-grid}.icon-btn:hover{background:var(--primary-soft);border-color:#0000}.speak-btn{background:var(--primary-soft);width:38px;height:38px;color:var(--primary);cursor:pointer;border:0;border-radius:50%;flex-shrink:0;place-items:center;font-size:1rem;display:inline-grid}.speak-btn:hover{background:var(--primary-soft-hover)}.speak-btn.is-playing{background:var(--primary);color:var(--on-primary)}.speak-lg{width:54px;height:54px;font-size:1.45rem}.media-icon{flex-shrink:0;width:1em;height:1em}.speak-btn .media-icon{width:16px;height:16px}.speak-lg .media-icon{width:22px;height:22px}.btn-media{align-items:center;gap:8px;display:inline-flex}.site-header{z-index:20;background:color-mix(in srgb, var(--bg) 88%, transparent);backdrop-filter:saturate(1.4)blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0}.header-inner{align-items:center;gap:32px;min-height:72px;display:flex}.logo{color:var(--navy);direction:ltr;unicode-bidi:isolate;align-items:center;font-size:1.35rem;font-weight:700;display:inline-flex}.logo span:not(.logo-mark){color:var(--primary)}.logo-mark{flex-shrink:0;width:1.5em;height:1.5em;margin-inline-end:8px}.lm-bubble{fill:var(--primary)}.lm-globe{stroke:var(--on-primary)}[data-pill]{align-items:center;gap:5px;display:inline-flex}.logo:hover{text-decoration:none}.main-nav{gap:28px;display:flex}.main-nav a{color:var(--ink);font-size:.95rem;font-weight:500}.main-nav a:hover{color:var(--primary);text-decoration:none}.header-actions{align-items:center;gap:10px;margin-inline-start:auto;display:flex}.lang-pill{background:var(--primary-soft);color:var(--primary);border-radius:999px;align-items:center;padding:0 4px;font-size:.92rem;font-weight:500;display:inline-flex}.pill-name{text-overflow:ellipsis;white-space:nowrap;vertical-align:bottom;max-width:120px;display:inline-block;overflow:hidden}.pill-arrow{opacity:.6}.pill-caret{opacity:.7;font-size:.75rem}.theme-toggle .to-light{display:none}:root[data-theme=dark] .theme-toggle .to-light{display:inline}:root[data-theme=dark] .theme-toggle .to-dark{display:none}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .theme-toggle .to-light{display:inline}:root:not([data-theme=light]) .theme-toggle .to-dark{display:none}}.lang-panel{border-radius:var(--radius-lg);background:var(--surface);width:min(620px,100vw - 32px);max-height:min(80vh,720px);color:var(--ink);box-shadow:var(--shadow-lg);border:0;padding:24px;overflow:auto}.lang-panel::backdrop{backdrop-filter:blur(2px);background:#0e111b59}.lang-panel-head{justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px;display:flex}.lang-panel-head h2{margin:0;font-size:1.3rem}.chip-heading{color:var(--muted);margin:18px 0 10px;font-size:.85rem;font-weight:600}.chip-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px;display:grid}.chip{border:1px solid var(--line);background:var(--surface);color:var(--navy);text-align:start;cursor:pointer;border-radius:14px;grid-template-columns:auto 1fr;align-items:center;column-gap:10px;padding:10px 12px;transition:border-color .15s,background .15s;display:grid}.chip:hover:not(:disabled){border-color:var(--primary)}.chip[aria-pressed=true]{border-color:var(--primary);background:var(--primary-soft)}.chip:disabled{opacity:.4;cursor:default}.chip-flag{grid-row:span 2;font-size:1.5rem;line-height:1}.chip-name{font-size:.92rem;font-weight:500}.chip-native{color:var(--muted);grid-column:2;font-size:.78rem}.lang-pill .pill-site,.lang-pill .pill-pair{color:inherit;font:inherit;cursor:pointer;background:0 0;border:0;border-radius:999px;align-items:center;gap:6px;padding:9px 12px;display:inline-flex}.lang-pill .pill-site{gap:4px;font-size:.8rem;font-weight:600}.lang-pill .pill-site:hover,.lang-pill .pill-pair:hover{background:var(--primary-soft-hover)}.lang-pill .pill-site:after{content:"";background:color-mix(in srgb, var(--primary) 30%, transparent);width:1px;height:18px;margin-inline-start:8px}.site-panel{width:min(360px,100vw - 32px)}.site-list{gap:8px;display:grid}.site-list .chip{grid-template-columns:auto 1fr}.site-list .chip-flag{grid-row:auto}.hero{background:var(--surface-2);padding:56px 0 80px;overflow:hidden}.hero-grid{grid-template-columns:1.05fr .95fr;align-items:center;gap:48px;display:grid}.hero-tag{color:var(--success-ink);align-items:center;gap:8px;margin:0 0 16px;font-size:.9rem;font-weight:600;display:inline-flex}.hero-tag svg{width:18px;height:18px;color:var(--success)}.hero h1{margin:0 0 18px;font-size:clamp(2.2rem,4.6vw,3.4rem);line-height:1.12}.hero-sub{color:var(--ink);max-width:540px;margin:0 0 32px;font-size:1.1rem}.pair-picker{padding:8px;background:var(--field);max-width:580px;box-shadow:0 24px 48px -24px #6556ff59, var(--shadow-sm);border-radius:999px;align-items:center;gap:14px;padding-inline-start:26px;display:flex}.pair-picker label{flex-direction:column;flex:1;min-width:0;display:flex}.pair-label{color:var(--muted);font-size:.75rem;font-weight:500}.pair-picker select{width:100%;color:var(--navy);font:inherit;cursor:pointer;background:0 0;border:0;padding:2px 0;font-size:1rem;font-weight:600}.pair-picker select:focus-visible{outline-offset:4px;border-radius:4px}.pair-divider{background:var(--line);width:1px;height:38px}.pair-go{background:var(--secondary);color:#fff;cursor:pointer;border:0;border-radius:50%;flex-shrink:0;place-items:center;width:56px;height:56px;font-size:1.35rem;transition:background .15s;display:grid}.pair-go:hover{background:var(--primary)}.perks{flex-wrap:wrap;gap:14px 28px;margin:32px 0 0;padding:0;list-style:none;display:flex}.perks li{color:var(--navy);align-items:center;gap:8px;font-weight:500;display:inline-flex}.perks svg{width:22px;height:22px;color:var(--sky-ink)}.hero-visual{min-height:440px;position:relative}.hero-backdrop{background:var(--backdrop);border-radius:32px;position:absolute;inset:36px 8% 24px 10%;transform:rotate(-4deg)}.word-card{border-radius:var(--radius-lg);background:var(--surface);width:min(280px,80%);box-shadow:var(--shadow-lg);text-align:center;justify-items:center;gap:4px;padding:36px 24px 28px;display:grid;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.word-card-emoji{font-size:4.5rem;line-height:1.1}.word-card-word{color:var(--navy);font-size:2rem;font-weight:700}.word-card-roman{min-height:1.4em;color:var(--muted);font-style:italic}.word-card-flag{top:-18px;background:var(--surface);width:48px;height:48px;box-shadow:var(--shadow);border-radius:50%;place-items:center;font-size:1.6rem;display:grid;position:absolute;inset-inline-end:-14px}.float-card{border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);align-items:center;gap:12px;padding:12px 16px;animation:6s ease-in-out infinite float;display:flex;position:absolute}.float-stat{top:6%;flex-direction:column;align-items:flex-start;gap:2px;inset-inline-end:2%}.float-lessons{bottom:10%;animation-delay:-3s;inset-inline-start:0}.float-num{color:var(--navy);font-size:1.4rem;font-weight:700;line-height:1}.float-label{color:var(--muted);font-size:.78rem}.float-icon{background:var(--sky);border-radius:12px;place-items:center;width:40px;height:40px;font-size:1.2rem;display:grid}.mini-bars{align-items:flex-end;gap:5px;height:44px;margin-top:6px;display:flex}.mini-bars i{border-radius:4px;width:8px}.mini-bars i:first-child{background:var(--bar-1)}.mini-bars i:nth-child(2){background:var(--bar-2)}.mini-bars i:nth-child(3){background:var(--bar-3)}.mini-bars i:nth-child(4){background:var(--bar-4)}@keyframes float{50%{transform:translateY(-8px)}}@media (prefers-reduced-motion:reduce){.float-card{animation:none}html{scroll-behavior:auto}}.band{padding:88px 0}.band-sky{background:var(--sky)}.band-soft{background:var(--surface-2)}.section-head{justify-content:space-between;align-items:end;gap:16px;margin-bottom:36px;display:flex}.section-title{margin:0;font-size:clamp(1.8rem,3.2vw,2.6rem)}.lang-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px;margin:0;padding:0;list-style:none;display:grid}.lang-card{border-radius:var(--radius);background:var(--surface);width:100%;height:100%;color:var(--ink);box-shadow:var(--shadow-sm);text-align:start;cursor:pointer;border:2px solid #0000;align-items:center;gap:14px;padding:16px 18px;transition:transform .15s,box-shadow .15s,border-color .15s;display:flex}.lang-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}.lang-card[aria-pressed=true]{border-color:var(--primary)}.lang-flag{font-size:2.2rem;line-height:1}.lang-text{flex-direction:column;min-width:0;display:flex}.lang-name{color:var(--navy);font-weight:600}.lang-native{color:var(--muted);align-self:flex-start;font-size:.88rem}.features{grid-template-columns:repeat(3,1fr);gap:24px;display:grid}.feature{background:var(--surface);box-shadow:var(--shadow-sm);border-radius:20px;padding:28px}.feature-icon{background:var(--primary-soft);border-radius:50%;place-items:center;width:54px;height:54px;font-size:1.5rem;display:grid}.feature h3{margin:18px 0 8px;font-size:1.15rem}.feature p{color:var(--muted);margin:0}.faq{max-width:860px}.faq .section-title{margin-bottom:28px}.faq details{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);margin-bottom:12px;padding:18px 22px}.faq summary{color:var(--navy);cursor:pointer;justify-content:space-between;gap:16px;font-weight:600;list-style:none;display:flex}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";color:var(--primary);font-size:1.3rem;line-height:1}.faq details[open] summary:after{content:"−"}.faq details p{color:var(--muted);margin:12px 0 0}.site-footer{background:var(--sky);padding:64px 0 28px}.footer-grid{grid-template-columns:1fr 1.6fr;gap:48px;display:grid}.footer-about{color:var(--ink);max-width:360px;margin:14px 0 0}.site-footer h3{margin:4px 0 14px;font-size:1rem}.footer-links{columns:2;column-gap:32px;margin:0;padding:0;list-style:none}.footer-links li{break-inside:avoid;margin-bottom:8px}.footer-links a{color:var(--ink)}.footer-links a:hover{color:var(--primary)}.footer-bottom{border-top:1px solid color-mix(in srgb, var(--navy) 12%, transparent);color:var(--muted);margin-top:40px;padding-top:20px}.footer-bottom p{margin:0}.lessons-hero-grid{grid-template-columns:1fr auto;align-items:end;gap:32px;display:grid}.lessons-progress{color:var(--muted);align-items:center;gap:12px;margin:18px 0 0;font-size:.9rem;display:flex}.progress-track{background:var(--line);border-radius:999px;width:180px;height:8px;display:block;overflow:hidden}.progress-track i{background:var(--ok);border-radius:inherit;width:0;height:100%;transition:width .3s;display:block}.pair-picker.is-compact{min-width:380px;padding:10px 24px}.lessons-layout{grid-template-columns:260px minmax(0,1fr);align-items:start;gap:36px;padding-top:32px;padding-bottom:80px;display:grid}.topics-nav{position:sticky;top:88px}.lesson-search{border:1px solid var(--line);background:var(--field);border-radius:999px;align-items:center;gap:8px;margin-bottom:20px;padding:10px 16px;display:flex}.lesson-search:focus-within{border-color:var(--primary)}.lesson-search input{min-width:0;color:var(--navy);font:inherit;background:0 0;border:0;outline:none;flex:1;font-size:.92rem}.topics-title{color:var(--muted);margin:0 0 10px;font-size:.85rem;font-weight:600}.topics-nav ul{margin:0;padding:0;list-style:none}.topics-nav li a{color:var(--ink);border-radius:12px;align-items:center;gap:10px;padding:8px 10px;font-size:.92rem;display:flex}.topics-nav li a:hover{background:var(--surface-2);color:var(--navy);text-decoration:none}.topic-count{color:var(--muted);margin-inline-start:auto;font-size:.78rem}.continue-card{border:1px solid var(--primary-soft-hover);background:var(--primary-soft);color:var(--navy);border-radius:20px;align-items:center;gap:16px;margin-bottom:36px;padding:16px 20px;display:flex}.continue-card:hover{border-color:var(--primary);text-decoration:none}.continue-card[hidden]{display:none}.continue-icon{background:var(--surface);width:52px;height:52px;box-shadow:var(--shadow-sm);border-radius:16px;place-items:center;font-size:1.7rem;display:grid}.continue-label{color:var(--primary);font-size:.8rem;font-weight:600;display:block}.continue-title{font-size:1.1rem;font-weight:600;display:block}.continue-step{color:var(--muted);font-size:.82rem;display:block}.lesson-card{position:relative}.lesson-card[data-up-next]{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}.lesson-card[data-up-next]:after{content:attr(data-up-next);top:-10px;background:var(--primary);color:var(--on-primary);border-radius:999px;padding:2px 10px;font-size:.72rem;font-weight:600;position:absolute;inset-inline-end:14px}.continue-go{background:var(--primary);width:40px;height:40px;color:var(--on-primary);border-radius:50%;place-items:center;margin-inline-start:auto;display:grid}.topic-section{margin-bottom:44px}.topic-heading{align-items:center;gap:12px;margin:0 0 16px;font-size:1.35rem;display:flex}.topic-heading-icon{background:linear-gradient(135deg, var(--surface-2), var(--sky));border-radius:14px;place-items:center;width:44px;height:44px;font-size:1.35rem;display:grid}.lesson-cards{grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:16px;margin:0;padding:0;list-style:none;display:grid}.lesson-card{border:1px solid var(--line);background:var(--surface);height:100%;color:var(--ink);box-shadow:var(--shadow-sm);border-radius:18px;flex-direction:column;gap:8px;padding:16px 18px;transition:transform .15s,box-shadow .15s,border-color .15s;display:flex}.lesson-card:hover{box-shadow:var(--shadow);border-color:var(--primary-soft-hover);text-decoration:none;transform:translateY(-3px)}.lc-top{justify-content:space-between;align-items:center;display:flex}.lc-icon{font-size:2rem;line-height:1}.lc-num{background:var(--surface-2);color:var(--muted);border-radius:999px;padding:3px 10px;font-size:.75rem;font-weight:600}.lc-title{color:var(--navy);font-weight:600;line-height:1.35}.lc-meta{color:var(--muted);font-size:.8rem}.lesson-card .ul-progress{margin-top:auto}[data-lesson].is-done .lc-num{background:var(--ok);color:#fff}.no-results{padding:40px 0}.unit-lessons{margin:0;padding:0;list-style:none}.unit-lessons a{color:var(--ink);border-radius:12px;grid-template-columns:28px 1fr;align-items:center;gap:10px;padding:7px 8px;font-size:.88rem;display:grid;position:relative}.unit-lessons a:hover{background:var(--surface-2);color:var(--navy);text-decoration:none}.ul-num{background:var(--surface-2);width:28px;height:28px;color:var(--muted);border-radius:50%;place-items:center;font-size:.75rem;font-weight:600;display:grid}.ul-progress{background:var(--line);border-radius:999px;height:4px;display:block;overflow:hidden}.unit-lessons .ul-progress{grid-column:2}.ul-progress i{height:100%;width:var(--p,0%);background:var(--primary);display:block}[data-lesson]:not(.is-started) .ul-progress{display:none}[data-lesson].is-done .ul-num{background:var(--ok);color:#fff}[data-lesson].is-done .ul-progress i{background:var(--ok)}.lesson-layout{grid-template-columns:300px minmax(0,1fr);align-items:start;gap:32px;display:grid}.lesson-index{top:88px;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);width:auto;height:auto;max-height:calc(100vh - 110px);color:var(--ink);margin:32px 0 0;padding:16px;display:block;position:sticky;inset:auto;overflow:auto}.lesson-index-head{justify-content:space-between;align-items:center;margin:0 4px 8px;display:flex}.lesson-index-head h2{margin:0;font-size:1.05rem}.lesson-index-close,.index-toggle{display:none}.lesson-index .unit{border-radius:14px}.lesson-index .unit+.unit{margin-top:2px}.lesson-index summary{cursor:pointer;border-radius:12px;align-items:center;gap:10px;padding:8px;list-style:none;display:flex}.lesson-index summary::-webkit-details-marker{display:none}.lesson-index summary:hover{background:var(--surface-2)}.lesson-index .unit[open]>summary{background:var(--primary-soft)}.unit-icon{font-size:1.2rem}.unit-title{color:var(--navy);font-size:.9rem;font-weight:600}.lesson-index .unit-lessons{padding:4px 0 8px}.lesson-index a[aria-current=page]{background:var(--primary);color:var(--on-primary);font-weight:500}.lesson-index a[aria-current=page] .ul-num{color:var(--on-primary);background:#fff3}.lesson-main{min-width:0}.page-hero{background:var(--surface-2);padding:36px 0 40px}.crumbs{color:var(--muted);flex-wrap:wrap;gap:6px;margin-bottom:18px;display:flex}.page-hero>.container>.row-between{margin-bottom:18px}.page-hero .crumbs{margin-bottom:0}.crumbs a{color:var(--muted)}.page-hero-row{align-items:flex-start;gap:20px;display:flex}.page-hero-icon{background:var(--surface);width:72px;height:72px;box-shadow:var(--shadow);border-radius:22px;flex-shrink:0;place-items:center;font-size:2.4rem;display:grid}.lesson-heading{margin:0 0 8px;font-size:clamp(1.8rem,3.6vw,2.6rem)}.lesson-intro{color:var(--muted);max-width:760px;margin:0}.notice{border:1px solid var(--notice-line);background:var(--notice-bg);border-radius:12px;margin:0 0 16px;padding:12px 16px;font-size:.9rem}.panel{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow);min-height:320px;padding:28px}.panel-title{margin:0 0 18px;font-size:1.35rem}.tabs{gap:8px;margin-bottom:20px;padding-bottom:6px;display:flex;overflow-x:auto}.tab{white-space:nowrap;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:999px;align-items:center;gap:6px;padding:8px 16px;font-size:.9rem;font-weight:500;display:inline-flex}.tab:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}.tab.is-active{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}.step-num{background:var(--surface);width:22px;height:22px;color:var(--muted);border-radius:50%;place-items:center;font-size:.75rem;font-weight:700;display:inline-grid}.tab.is-done .step-num{background:var(--ok);color:var(--on-primary)}.tab.is-active .step-num{background:var(--on-primary);color:var(--primary)}.steps-progress{flex-wrap:wrap;align-items:center;gap:8px 14px;margin-bottom:14px;display:flex}.steps-label{color:var(--navy);font-weight:600}.steps-progress .progress-track{flex:1;width:auto;min-width:120px}.steps-done{font-size:.85rem}.lesson-complete{border:1px solid var(--primary-soft-hover);background:var(--primary-soft);border-radius:20px;flex-wrap:wrap;align-items:center;gap:12px 16px;margin-bottom:18px;padding:16px 20px;display:flex}.lesson-complete strong{color:var(--navy);font-size:1.1rem}.lesson-complete p{margin:2px 0 0;font-size:.9rem}.lesson-complete-emoji{font-size:2rem;line-height:1}.lesson-complete .btn{margin-inline-start:auto}.lesson-nav{margin-top:32px;font-weight:500}.pic{flex-shrink:0;place-items:center;display:inline-grid}.pic-sm{width:34px;height:34px;font-size:1.4rem}.pic-md{width:48px;height:48px;font-size:2rem}.pic-lg{width:96px;height:96px;font-size:4rem}.pic-swatch{border:2px solid var(--swatch-line);border-radius:50%}.pic-label{background:var(--primary-soft);color:var(--primary);border-radius:10px;font-size:.85rem;font-weight:700}.pic-md.pic-label{font-size:1.1rem}.pic-lg.pic-label{border-radius:18px;font-size:2.2rem}.target-word{flex-direction:column;line-height:1.25;display:inline-flex}.tw-text{color:var(--navy);align-self:flex-start;font-weight:600}.tw-roman{color:var(--muted);font-size:.8em;font-style:italic;font-weight:400}.tw-say{color:var(--muted);margin-top:2px;font-size:.8em;font-weight:400}.tw-say:before{content:"🗣";margin-inline-end:5px}.big{text-align:center;font-size:1.9rem}.big .tw-roman,.big .tw-say{font-size:1rem}.vocab-list{margin:14px 0 0;padding:0;list-style:none}.vocab-list li{border-bottom:1px solid var(--line);border-radius:12px;grid-template-columns:40px 1fr 1fr 40px;align-items:center;gap:12px;padding:10px;transition:background .2s;display:grid}.vocab-list li.is-playing{background:var(--primary-soft)}.vocab-target .tw-text{font-size:1.1rem}.flashcard{perspective:1000px;cursor:pointer;outline:none;max-width:440px;height:290px;margin:14px auto 0}.flashcard-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .5s;position:relative}.flashcard.is-flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard:focus-visible .flashcard-inner{box-shadow:0 0 0 3px var(--primary);border-radius:var(--radius-lg)}.flashcard-face{backface-visibility:hidden;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow);flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:20px;display:flex;position:absolute;inset:0}.flashcard-back{background:var(--surface-2);transform:rotateY(180deg)}.tile{border:1.5px solid var(--line);background:var(--surface);width:100%;min-height:58px;color:var(--ink);text-align:start;cursor:pointer;border-radius:14px;align-items:center;gap:10px;padding:12px 16px;transition:border-color .15s,background .15s,opacity .3s;display:flex}.tile:hover:not(:disabled){border-color:var(--primary)}.tile.is-selected{border-color:var(--primary);background:var(--primary-soft)}.tile.is-matched{border-color:var(--ok);background:var(--ok-soft)}.tile.is-wrong,.ttt-cell.is-wrong{border-color:var(--bad);background:var(--bad-soft);animation:.35s shake}.tile.is-dim{opacity:.45}.tile:disabled{cursor:default}@keyframes shake{25%{transform:translate(-5px)}75%{transform:translate(5px)}}.match-grid{grid-template-columns:1fr 1fr;gap:16px;max-width:700px;margin:0 auto;display:grid}.match-col{flex-direction:column;gap:10px;display:flex}.ttt-prompt{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;margin-bottom:18px;font-size:1.15rem;display:flex}.ttt-board{grid-template-columns:repeat(3,1fr);gap:10px;max-width:450px;margin:0 auto;display:grid}.ttt-cell{aspect-ratio:1;border:1.5px solid var(--line);border-radius:var(--radius);background:var(--surface);color:var(--ink);text-align:center;cursor:pointer;place-items:center;padding:6px;display:grid}.ttt-cell:hover:not(:disabled){border-color:var(--primary);background:var(--primary-soft)}.ttt-cell .target-word,.memory-card .target-word,.big.target-word{align-items:center}:is(.ttt-cell,.memory-card,.big) .tw-text{align-self:center}.ttt-cell.owner-X{background:var(--primary-soft);border-color:var(--primary)}.ttt-cell.owner-O{background:var(--sky);border-color:var(--sky-ink)}.ttt-mark{font-size:3rem;font-weight:700}.owner-X .ttt-mark{color:var(--primary)}.owner-O .ttt-mark{color:var(--secondary)}.memory-grid{grid-template-columns:repeat(4,1fr);gap:12px;max-width:640px;margin:0 auto;display:grid}.memory-card{aspect-ratio:4/3;border-radius:var(--radius);background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;text-align:center;cursor:pointer;border:0;place-items:center;padding:6px;transition:transform .2s;display:grid}.memory-card:hover{transform:translateY(-2px)}.memory-card.is-open{background:var(--surface);color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--line)}.memory-card.is-matched{background:var(--ok-soft);box-shadow:inset 0 0 0 1.5px var(--ok)}.memory-card .target-word{align-items:center}.memory-back{opacity:.85;font-size:1.8rem;font-weight:700}.memory-source{flex-direction:column;align-items:center;font-size:.9rem;display:flex}.listen-play{flex-direction:column;align-items:center;gap:10px;min-height:120px;margin:8px 0 20px;display:flex}.listen-options{grid-template-columns:repeat(2,1fr);gap:12px;max-width:580px;margin:0 auto;display:grid}.tile-option{font-weight:500}.finished{text-align:center;padding:30px 0}.finished-emoji{font-size:3.5rem}.finished h3{margin:8px 0;font-size:1.6rem}@media (width<=1080px){.lessons-layout{grid-template-columns:minmax(0,1fr);gap:20px;padding-top:20px}.topics-nav{position:static}.topics-title{display:none}.topics-nav ul{gap:8px;padding-bottom:6px;display:flex;overflow-x:auto}.topics-nav li a{white-space:nowrap;border:1px solid var(--line);border-radius:999px;padding:7px 14px}.lessons-hero-grid{grid-template-columns:1fr;gap:20px}.pair-picker.is-compact{min-width:0}.lesson-layout{grid-template-columns:minmax(0,1fr)}.index-toggle{padding:8px 16px;font-size:.88rem;display:inline-flex}.lesson-index-close{display:inline-grid}.lesson-index:not(:popover-open){display:none}.lesson-index:popover-open{border-radius:0 var(--radius-lg) var(--radius-lg) 0;width:min(360px,88vw);height:100%;max-height:none;box-shadow:var(--shadow-lg);border:0;margin:0;position:fixed;inset:0 auto 0 0}:root[dir=rtl] .lesson-index:popover-open{border-radius:var(--radius-lg) 0 0 var(--radius-lg);inset:0 0 0 auto}.lesson-index::backdrop{background:#0e111b59}}@media (width<=960px){.hero-grid{grid-template-columns:1fr;gap:24px}.hero-visual{width:100%;max-width:520px;min-height:360px;margin:0 auto}.features{grid-template-columns:1fr}}@media (width<=760px){.main-nav{display:none}.header-inner{gap:12px;min-height:64px}.band{padding:64px 0}.hero{padding:36px 0 56px}.footer-grid{grid-template-columns:1fr;gap:28px}.panel{padding:18px}.page-hero-icon{border-radius:18px;width:56px;height:56px;font-size:1.9rem}.vocab-list li{grid-template-columns:34px 1fr 38px}.vocab-source{color:var(--muted);grid-area:1/2;font-size:.85rem}.vocab-list .vocab-target{grid-area:2/2}.vocab-list .pic{grid-row:1/3}.vocab-list .speak-btn{grid-area:1/3/3}.match-grid{gap:8px}.tile{padding:10px;font-size:.9rem}.memory-grid{grid-template-columns:repeat(3,1fr)}.memory-card,.ttt-cell{font-size:.8rem}.ttt-mark{font-size:2.2rem}}@media (width<=600px){.pill-name{display:none}}@media (width<=520px){.pair-picker{border-radius:24px;flex-wrap:wrap;gap:10px;padding:14px 16px}.pair-picker label{flex:40%}.pair-divider{display:none}.pair-go{border-radius:999px;width:100%;height:48px}}