:root{--bg:#f4f7f6;--panel:#fff;--ink:#14302e;--muted:#4f6663;--line:#d6e1de;--accent:#e4572e;--accent-ink:#fff;--soft:#e9f1ef;
--math:#1b5e9e;--math-bg:#e1eefa;--eng:#0b6e5f;--eng-bg:#ddf3ee;--chi:#a13a23;--chi-bg:#fce8e2;--warn:#6d4f00;--warn-bg:#fff3d1;
--t1:#d9f2ec;--t2:#ffe6d6;--t3:#e7e3fb;--t4:#fde2ec;--t5:#e0f0d6;--t6:#dcebfb;--shadow:0 10px 30px rgba(20,48,46,.09);
--body:"Noto Sans HK","PingFang HK","Microsoft JhengHei",sans-serif}
@media (prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#0f1b1a;--panel:#172725;--ink:#e6f0ee;--muted:#a4b8b4;--line:#2d423f;--accent:#f4784f;--accent-ink:#1b0d07;--soft:#1e302e;
--math:#92c6f5;--math-bg:#1b3549;--eng:#7fdccb;--eng-bg:#15392f;--chi:#f4b3a1;--chi-bg:#46231a;--warn:#f2d98a;--warn-bg:#3a2f10;
--t1:#173a35;--t2:#44291b;--t3:#2c2850;--t4:#44202f;--t5:#25391e;--t6:#1b3147;--shadow:0 10px 30px rgba(0,0,0,.35)}}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 var(--body)}
img{max-width:100%;height:auto;display:block}a{color:inherit}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.site-head{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:66px}
.brand{font-weight:900;text-decoration:none;font-size:1.08rem;white-space:nowrap}
.nav{display:flex;gap:4px}.nav a{text-decoration:none;font-weight:600;font-size:.95rem;padding:7px 12px;border-radius:999px;white-space:nowrap}
.nav a:hover{background:var(--soft)}.nav a.on{background:var(--ink);color:var(--bg)}
.mnav{display:none}
h1,h2,h3{line-height:1.25;margin:0;font-weight:900;text-wrap:balance}
h1{font-size:clamp(2rem,4.4vw,3.3rem);letter-spacing:-.01em}
h2{font-size:clamp(1.45rem,2.6vw,2rem);margin-bottom:10px}
h3{font-size:1.1rem;font-weight:800}
p{margin:0}.lead{font-size:1.1rem;color:var(--muted);max-width:60ch;margin-top:10px}.nb{display:inline-block}
section{padding:44px 0}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.btn{display:inline-flex;align-items:center;gap:7px;font:700 1rem var(--body);text-decoration:none;border-radius:999px;padding:11px 22px;border:1.5px solid var(--ink);background:transparent;color:var(--ink);cursor:pointer;white-space:nowrap;transition:transform .18s}
.btn.pri{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn:hover{transform:translateY(-2px)}.btn:active{transform:translateY(0) scale(.98)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.hero{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center;padding:52px 0 36px}
.collage{position:relative;aspect-ratio:16/11}
.collage img{position:absolute;width:68%;border-radius:16px;box-shadow:var(--shadow);border:1px solid var(--line)}
.collage img:nth-child(1){left:0;top:4%;transform:rotate(-3deg)}
.collage img:nth-child(2){right:0;top:24%;transform:rotate(2.5deg)}
.collage img:nth-child(3){left:16%;bottom:0;transform:rotate(-1deg)}
.cycle{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:20px;padding:0;list-style:none}
.cycle li{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px;position:relative}
.cycle li b{display:block;font-size:1.05rem}.cycle span{font-size:1.5rem}.cycle small{color:var(--muted);font-size:.87rem;line-height:1.5;display:block}
.cycle li:not(:last-child)::after{content:"→";position:absolute;right:-13px;top:42%;font-weight:900;color:var(--accent);z-index:1}
.bento{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:20px}
.tile{display:flex;flex-direction:column;gap:6px;border-radius:16px;padding:18px;text-decoration:none;min-height:176px;transition:transform .2s}
.tile:hover{transform:translateY(-3px)}.tile .e{font-size:2rem;line-height:1.1}.tile p{font-size:.93rem;color:var(--muted);line-height:1.55}
.tile.big{grid-column:span 2;grid-row:span 2}.tile.big img{border-radius:12px;margin-top:auto;border:1px solid var(--line)}
.tile.wide{grid-column:span 4;min-height:0;flex-direction:row;align-items:center;gap:14px}
.f1{background:var(--t1)}.f2{background:var(--t2)}.f3{background:var(--t3)}.f4{background:var(--t4)}.f5{background:var(--t5)}.f6{background:var(--t6)}
.routes{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:14px;border-top:3px solid var(--ink)}
.routes a{text-decoration:none;padding:16px 18px 16px 0;display:block}.routes a+a{padding-left:18px;border-left:1px solid var(--line)}
.routes b{font-size:1.15rem}.routes p{color:var(--muted);font-size:.95rem}
.pills{display:flex;gap:8px;overflow-x:auto;padding:14px 0 4px;scrollbar-width:thin}
.pills a{flex:none;text-decoration:none;font-weight:700;font-size:.92rem;border:1px solid var(--line);background:var(--panel);border-radius:999px;padding:6px 14px}
.pills a.on{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.fhero{border-radius:20px;padding:30px;margin-top:14px;display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:center}
.fhero .e{font-size:3.6rem;line-height:1}.fhero .lead{color:inherit;opacity:.85}
.uses{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:14px}
.uses div{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px}.uses p{color:var(--muted);font-size:.94rem}
.flow{list-style:none;padding:0;margin:14px 0 0;counter-reset:s;display:grid;gap:10px}
.flow li{counter-increment:s;display:grid;grid-template-columns:38px 1fr;gap:12px;align-items:start;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:12px 16px}
.flow li::before{content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--accent);color:var(--accent-ink);font-weight:800}
.note{background:var(--warn-bg);color:var(--warn);border-radius:16px;padding:14px 18px;margin-top:14px}.note ul{margin:4px 0 0;padding-left:20px}
.demo{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:20px;margin-top:14px;box-shadow:var(--shadow)}
.demo small{color:var(--muted)}
.chat{display:grid;gap:8px;min-height:120px;margin:12px 0}
.msg{max-width:82%;padding:9px 14px;border-radius:16px;animation:in .3s ease both}.msg.me{justify-self:end;background:var(--math-bg)}.msg.bot{background:var(--t1)}
@keyframes in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.opts{display:grid;gap:8px;margin:12px 0}.opt{text-align:left;font:600 1rem var(--body);color:var(--ink);background:var(--soft);border:1.5px solid var(--line);border-radius:12px;padding:10px 14px;cursor:pointer}
.opt.ok{background:var(--eng-bg);border-color:var(--eng)}.opt.no{background:var(--chi-bg);border-color:var(--chi)}
.flip{perspective:900px;width:min(420px,100%);height:210px;margin:12px auto;background:none;border:0;padding:0;cursor:pointer;display:block;font:inherit;color:inherit}
.flip-in{position:relative;display:block;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}.flip.on .flip-in{transform:rotateY(180deg)}
.face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:16px;border-radius:16px;backface-visibility:hidden;background:var(--t4);text-align:center}
.face.back{transform:rotateY(180deg);background:var(--t1)}.face b{font-size:1.7rem}
.word{background:var(--t5);border:0;border-bottom:2px dashed var(--eng);font:inherit;color:inherit;cursor:pointer;padding:0 3px;border-radius:4px}
.gloss{min-height:1.8em;margin-top:10px;font-weight:700;color:var(--eng)}
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.tab{font:700 .93rem var(--body);color:var(--ink);background:var(--soft);border:1px solid var(--line);border-radius:999px;padding:6px 14px;cursor:pointer}
.tab[aria-pressed="true"]{background:var(--ink);color:var(--bg)}
.score{display:flex;gap:18px;flex-wrap:wrap;margin:10px 0}.score div{min-width:92px}.score b{display:block;font-size:2rem;line-height:1.1;color:var(--accent)}
.next{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:6px 0 40px}
.next a{text-decoration:none;font-weight:700;border-bottom:2px solid var(--accent)}
.mk{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px;margin-top:14px}
.mk a{display:flex;flex-direction:column;gap:6px;text-decoration:none;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px;transition:transform .2s}
.mk a:hover{transform:translateY(-3px)}.mk .e{font-size:1.7rem}.mk p{color:var(--muted);font-size:.92rem;line-height:1.55}
.grp{margin-top:30px}
.chip{display:inline-block;align-self:flex-start;padding:1px 10px;border-radius:999px;font-size:.8rem;font-weight:700;white-space:nowrap}
.chip.m{background:var(--math-bg);color:var(--math)}.chip.e{background:var(--eng-bg);color:var(--eng)}.chip.c{background:var(--chi-bg);color:var(--chi)}
.names{display:flex;flex-wrap:wrap;gap:6px 8px;align-items:center;margin:14px 0}.names b{font-size:.92rem}.names span{border:1px solid var(--line);background:var(--panel);border-radius:999px;padding:1px 11px;font-size:.9rem}
.setbox{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:10px 16px;margin:14px 0}
.setgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px 22px;margin-top:6px}.setgrid div b{display:block;font-size:.84rem;color:var(--muted)}
.blk{background:var(--panel);border:1px solid var(--line);border-radius:16px;margin:12px 0;overflow:hidden}
.bh{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;border-bottom:1px solid var(--line)}
.bt{display:flex;align-items:center;gap:10px;min-width:0}.ic{font-size:1.3rem;flex:none}.ba{display:flex;gap:6px;flex:none}
.bh strong{display:block;line-height:1.35}.to{display:block;color:var(--muted);font-size:.84rem;line-height:1.35}
.cp,.tg{font:700 .9rem var(--body);border-radius:999px;padding:6px 15px;cursor:pointer}
.cp{color:var(--bg);background:var(--ink);border:1px solid var(--ink)}.cp.done{background:var(--eng);border-color:var(--eng)}
.tg{color:var(--ink);background:transparent;border:1px solid var(--line)}
.fold .bh{border-bottom:0}.fold pre{display:none}.fold.open .bh{border-bottom:1px solid var(--line)}.fold.open pre{display:block}
pre{margin:0;padding:12px 14px;white-space:pre-wrap;overflow-wrap:anywhere;font:.93rem/1.65 var(--body)}pre.tall{max-height:16rem;overflow:auto}
.chk{border-left:4px solid var(--eng);padding:4px 0 4px 14px;margin:18px 0}.chk ul{margin:2px 0 0;padding-left:20px}
.filter{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}
.games{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.game{display:flex;flex-direction:column;text-decoration:none;background:var(--panel);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:transform .2s}
.game:hover{transform:translateY(-3px)}.game img{aspect-ratio:16/10;object-fit:cover;object-position:top;width:100%;border-bottom:1px solid var(--line)}
.game div{padding:12px 16px 16px;display:flex;flex-direction:column;gap:4px}.game p{color:var(--muted);font-size:.93rem;line-height:1.55}
.game[hidden]{display:none}
.ghero{display:grid;grid-template-columns:1fr 1.1fr;gap:30px;align-items:center;padding:30px 0 10px}
.ghero img{border-radius:16px;border:1px solid var(--line);box-shadow:var(--shadow)}
.facts{display:flex;flex-wrap:wrap;gap:22px;margin-top:14px}.facts b{display:block;font-size:1.35rem;line-height:1.2;color:var(--accent)}.facts span{font-size:.86rem;color:var(--muted)}
.levels{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:12px}.levels div{border-radius:16px;padding:14px;background:var(--panel);border:1px solid var(--line)}.levels p{font-size:.93rem;color:var(--muted)}
.frame{width:100%;height:min(78dvh,720px);border:1px solid var(--line);border-radius:16px;background:var(--panel);margin-top:12px}
table.plan{width:100%;border-collapse:collapse;margin-top:12px;background:var(--panel);border-radius:16px;overflow:hidden}
.plan th,.plan td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:.95rem}.plan thead th{background:var(--soft)}
.tablewrap{overflow-x:auto}
.src{columns:2;font-size:.92rem;padding-left:18px}.src li{break-inside:avoid;margin-bottom:4px}
.site-foot{border-top:1px solid var(--line);padding:22px 0 34px;color:var(--muted);font-size:.9rem}
.maker{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:8px;color:var(--ink);font-size:.98rem}.maker a{font-weight:600}
.rv{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}.rv.in{opacity:1;transform:none}
@media (max-width:900px){.nav{display:none}.mnav{display:block;position:relative}.mnav summary{list-style:none;cursor:pointer;font-weight:800;padding:7px 14px;border:1px solid var(--line);border-radius:999px}.mnav summary::-webkit-details-marker{display:none}
.mnav nav{position:absolute;right:0;top:46px;background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:8px;display:grid;min-width:170px}.mnav nav a{text-decoration:none;font-weight:700;padding:8px 12px;border-radius:10px}
.hero,.ghero{grid-template-columns:1fr;gap:20px}.hero{padding-top:30px}.cycle{grid-template-columns:1fr}.cycle li::after{display:none}
.bento{grid-template-columns:1fr 1fr}.tile.big{grid-column:span 2;grid-row:auto}.tile.wide{grid-column:span 2}
.uses,.levels,.routes{grid-template-columns:1fr}.routes a+a{padding-left:0;border-left:0;border-top:1px solid var(--line)}.fhero{grid-template-columns:1fr;padding:22px}.src{columns:1}}
@media (max-width:520px){.bento{grid-template-columns:1fr}.tile.big,.tile.wide{grid-column:auto}.tile.wide{flex-direction:column;align-items:flex-start}.bh{flex-wrap:wrap}.btn{white-space:normal}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}.rv{opacity:1;transform:none}}

/* Gemini Canvas 頁：七款實測截圖 */
details.proof{margin-top:14px;background:var(--panel);border-radius:16px;padding:12px 18px}
details.proof summary{cursor:pointer;font-weight:800}
details.proof figure{margin:16px 0 0}
details.proof figcaption{font-weight:700;margin-bottom:8px}
details.proof figure div{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:12px;align-items:start}
details.proof img{width:100%;height:auto;border-radius:12px;border:1px solid rgba(0,0,0,.08)}
@media (max-width:640px){details.proof figure div{grid-template-columns:1fr}}