:root{--paper:#fff8fc;--ink:#4a2038;--strong:#351127;--soft:#786072;--glass:rgba(255,255,255,.48);--glass-strong:rgba(255,255,255,.72);--line:rgba(255,255,255,.8);--edge:rgba(74,32,56,.12);--shadow:0 22px 65px #79416915;--brand:linear-gradient(105deg,#6ea8ff,#b794ff 40%,#ff8fab 70%,#5eead4);color-scheme:light;font-synthesis:none}
:root[data-mood=dusk]{--paper:#160b19;--ink:#fff0f7;--strong:#fff7fb;--soft:#cdb7c7;--glass:rgba(42,20,38,.6);--glass-strong:rgba(47,22,42,.82);--line:rgba(255,235,248,.16);--edge:rgba(255,235,248,.14);--shadow:0 24px 65px #0700083d;color-scheme:dark}
*{box-sizing:border-box}html{background:var(--paper);scroll-behavior:smooth}body{margin:0;min-width:320px;color:var(--ink);font-family:Nunito,'Noto Sans TC',sans-serif;line-height:1.55}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit;color:inherit}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-decoration:none}button{border:0}svg{stroke-linecap:round;stroke-linejoin:round}[hidden]{display:none!important}::selection{background:#ffb4d2;color:#3f1530}:focus-visible{outline:3px solid #b794ff;outline-offset:4px}.shell{width:min(1160px,calc(100% - 64px));margin-inline:auto}.backdrop{position:fixed;inset:0;z-index:-1;background:radial-gradient(ellipse at 0 6%,#cddcffc2,transparent 42%),radial-gradient(ellipse at 100% 4%,#ffd2e8b8,transparent 42%),radial-gradient(ellipse at 75% 80%,#c9ffe994,transparent 45%),var(--paper)}[data-mood=dusk] .backdrop{background:radial-gradient(ellipse at 0 6%,#48325380,transparent 45%),radial-gradient(ellipse at 100% 4%,#54253a85,transparent 44%),radial-gradient(ellipse at 70% 90%,#234b443d,transparent 45%),var(--paper)}
.site-header{display:flex;align-items:center;justify-content:space-between;padding-block:24px;gap:20px}.brand{display:flex;align-items:center;min-height:48px}.brand img{display:block;width:145px;height:auto}.site-header nav{display:flex;align-items:center;gap:4px;padding:5px;border:1px solid var(--line);border-radius:24px;background:var(--glass);box-shadow:inset 0 1px #ffffff3d;backdrop-filter:blur(20px)}.home-link,.icon-button{display:inline-flex;align-items:center;justify-content:center;min-height:42px;border-radius:18px;padding:0 17px;background:transparent;font-size:13px;font-weight:700}.icon-button{width:42px;padding:0}.icon-button svg{width:19px;height:19px}.home-link:hover,.icon-button:hover,.home-link:active,.icon-button:active{background:var(--glass-strong)}
main{padding-top:35px}.library-heading{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px;margin-bottom:36px}h1{font-family:Quicksand,'Noto Sans TC',sans-serif;font-size:clamp(2.8rem,6vw,4.4rem);font-weight:600;letter-spacing:-.065em;line-height:1.15;margin:0;color:var(--strong)}.ai-link{display:inline-flex;align-items:center;gap:10px;padding:10px 16px 10px 10px;min-height:52px;background:var(--glass);border:1px solid var(--line);border-radius:22px;box-shadow:0 4px 0 #c8a8c22b,0 9px 22px #aa80a215;font-family:Comfortaa,sans-serif;font-size:14px;white-space:nowrap;transition:transform .2s,background .2s,box-shadow .2s}.ai-link>span:nth-child(2){background:var(--brand);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:700}.ai-link>svg{width:15px;height:15px;color:var(--soft)}.ai-avatar{display:grid;place-items:center;position:relative;width:30px;height:30px;border-radius:50%;font-family:Georgia,serif;font-size:20px;color:#826293;background:linear-gradient(135deg,#f4cde5,#ded3f5)}.ai-avatar sup{position:absolute;top:1px;right:3px;font-size:9px}.ai-link:hover,.ai-link:active{transform:translateY(-2px);background:var(--glass-strong);box-shadow:0 6px 0 #c8a8c22b,0 12px 24px #aa80a21a}
.library-controls{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:26px}.filters{display:inline-flex;gap:3px;padding:5px;background:var(--glass);border:1px solid var(--line);border-radius:19px;backdrop-filter:blur(18px)}.filters button{min-height:40px;padding:0 20px;border-radius:14px;font-size:14px;background:transparent;transition:background .2s,box-shadow .2s,transform .2s;color:var(--soft)}.filters button[aria-pressed=true]{background:var(--glass-strong);color:var(--ink);box-shadow:0 2px 8px #7941690d,inset 0 1px #ffffff4d}.filters button:hover,.filters button:active{background:var(--glass-strong);color:var(--ink)}.search{display:flex;align-items:center;gap:10px;min-height:48px;min-width:0;width:290px;border-bottom:1px solid var(--edge);padding:5px 3px}.search>svg{flex:0 0 18px;width:18px;height:18px;color:var(--soft)}.search input{min-width:0;width:100%;border:0;outline:none;background:transparent;font-size:14px;appearance:none}.search input::-webkit-search-cancel-button{display:none}.search input::placeholder{color:var(--soft)}.search:focus-within{border-color:#b794ff}.search button{background:transparent;font-size:22px;width:30px;height:30px;border-radius:50%}
.catalog{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.lesson{--tone:#d5c7fa;position:relative;display:flex;flex-direction:column;min-width:0;min-height:258px;padding:25px;border:1px solid var(--line);border-radius:26px;background:linear-gradient(125deg,color-mix(in srgb,var(--tone) 20%,transparent),transparent 64%),var(--glass);box-shadow:var(--shadow),inset 0 1px #ffffff66;overflow:hidden;transition:transform .24s,box-shadow .24s,background .24s;isolation:isolate}.lesson::after{content:'';position:absolute;inset:0;border-radius:inherit;background:radial-gradient(circle at var(--spot-x,80%) var(--spot-y,0),#ffffff78,transparent 58%);opacity:0;z-index:-1;transition:opacity .25s}.lesson:hover,.lesson:active{transform:translateY(-5px);box-shadow:0 27px 65px #79416921,inset 0 1px #ffffff99}.lesson:hover::after,.lesson:active::after{opacity:1}.tone-blue{--tone:#bed7ff}.tone-mint{--tone:#bce8d7}.tone-rose{--tone:#f3c0d6}.tone-peach{--tone:#f4d1b7}.lesson-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:22px}.lesson-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:15px;border:1px solid var(--line);background:color-mix(in srgb,var(--tone) 20%,var(--glass));color:var(--ink)}.lesson-icon svg{width:22px;height:22px}.kind{color:var(--soft);font-size:12px}.lesson h2{font-family:Quicksand,'Noto Sans TC',sans-serif;font-size:22px;line-height:1.45;letter-spacing:-.025em;font-weight:600;margin:0 0 9px;overflow-wrap:anywhere}.lesson-bottom{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;margin-top:auto;padding-top:20px}.tags{display:flex;gap:6px;flex-wrap:wrap}.tags span{font-size:11px;line-height:1.6;padding:3px 8px;border:1px solid var(--line);border-radius:8px;background:var(--glass);color:var(--soft)}.card-arrow{display:grid;place-items:center;flex:0 0 32px;width:32px;height:32px;border:1px solid var(--line);border-radius:12px;background:var(--glass);transition:transform .2s}.card-arrow svg{width:15px;height:15px}.lesson:hover .card-arrow,.lesson:active .card-arrow{transform:translate(2px,-2px)}.featured{grid-column:span 2;display:grid;grid-template-columns:1fr 180px;column-gap:28px;min-height:258px;padding:28px 30px;background:linear-gradient(115deg,#e4dcff75,#f9e0ef6e 56%,#d6f2e84d),var(--glass)}.featured .lesson-main{display:flex;flex-direction:column;min-width:0}.featured .lesson-top{margin-bottom:18px}.featured h2{font-size:clamp(24px,3vw,30px);line-height:1.4}.featured .lesson-bottom{padding-top:18px}.unit-map{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;align-self:center}.unit-map>span{display:flex;flex-direction:column;justify-content:center;align-items:flex-start;gap:4px;min-height:80px;padding:12px;border:1px solid var(--line);border-radius:17px;background:var(--glass)}.unit-map strong{font-family:Comfortaa,sans-serif;font-size:20px;font-weight:600;color:var(--ink)}.unit-map small{font-size:11px;color:var(--soft)}.unit-map>span:nth-child(2){background:#eaf0fb88}.unit-map>span:nth-child(3){background:#e8f3ee88}.unit-map>span:nth-child(4){background:#fbede688}[data-mood=dusk] .featured{background:linear-gradient(115deg,#5140614d,#52334640,#2e4a433d),var(--glass)}[data-mood=dusk] .unit-map>span{background:var(--glass)}
.empty{min-height:260px;display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px solid var(--line);border-radius:26px;background:var(--glass);color:var(--soft)}.empty-symbol{font-size:36px}.empty p{margin:8px 0 20px}.empty button{padding:10px 18px;border-radius:13px;border:1px solid var(--line);background:var(--glass-strong)}footer{display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid var(--edge);margin-top:55px!important;padding-block:25px 35px;font-size:12px;color:var(--soft)}footer>span{font-family:Comfortaa,sans-serif}footer>div{display:flex;gap:22px}footer a:hover,footer a:active{color:var(--ink)}.sr-only{position:absolute;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;z-index:10;top:-70px;left:20px;background:var(--ink);color:var(--paper);border-radius:12px;padding:10px 15px}.skip-link:focus{top:15px}
@media(min-width:700px) and (max-width:1000px){.catalog{grid-template-columns:repeat(2,minmax(0,1fr))}.featured{grid-column:span 2}}
@media(max-width:699px){.shell{width:calc(100% - 32px)}.site-header{padding-block:16px;gap:10px}.brand img{width:117px}.home-link{padding:0 10px;font-size:12px}.icon-button{width:36px;min-height:38px}.site-header nav{gap:0;padding:4px;border-radius:19px}main{padding-top:24px}.library-heading{gap:12px;margin-bottom:27px}h1{font-size:42px}.ai-link{font-size:12px;gap:8px;padding:8px 12px 8px 8px;min-height:46px;border-radius:18px}.ai-avatar{width:27px;height:27px;font-size:18px}.ai-link>svg{width:13px;height:13px}.library-controls{align-items:stretch;flex-direction:column;gap:14px;margin-bottom:22px}.filters{display:flex;align-self:flex-start;max-width:100%;gap:2px;padding:4px;border-radius:17px}.filters button{padding:0 19px;min-height:40px;font-size:13px}.search{width:100%;min-height:42px}.catalog{grid-template-columns:minmax(0,1fr);gap:14px}.lesson{min-height:222px;padding:22px;border-radius:23px}.lesson-top{margin-bottom:18px}.lesson h2{font-size:22px}.featured{grid-column:auto;grid-template-columns:1fr;gap:18px;padding:22px}.featured h2{font-size:27px}.featured .lesson-top{margin-bottom:17px}.unit-map{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}.unit-map>span{min-height:65px;padding:9px 8px;border-radius:13px;gap:3px}.unit-map strong{font-size:16px}.unit-map small{font-size:10px}.featured .lesson-bottom{padding-top:14px}.lesson-icon{width:40px;height:40px;border-radius:13px}.lesson-bottom{padding-top:20px}footer{margin-top:36px!important;padding-block:20px 26px}}
@media(max-width:359px){.brand img{width:105px}.home-link{padding-inline:7px}.icon-button{width:33px}.filters{align-self:stretch}.filters button{flex:1;padding-inline:12px}.ai-link{font-size:11px;gap:6px}.unit-map strong{font-size:15px}.featured h2{font-size:25px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}