/* 見微理畫｜實驗室方格紙風：細線、襯線標題、藍綠方格紙、原創器材點綴（與數光島筆記本同系列） */
:root{--bg:#edf3f1;--paper:#fbfdfc;--paper2:#e8f1ee;--ink:#142530;--soft:#5d7280;--line:#c6d6d1;--rule:#d6e3df;--margin:#c4492f;--p1:#c4492f;--p2:#2a6f97;--p3:#2f8f7a;--p4:#dfa326;--p4b:#8a6a3c;--p5:#6f5fb0;--shadow:rgba(20,37,48,.16);--grid:rgba(42,111,151,.07);--glow:rgba(47,143,122,.16);
 --serif:"LXGW WenKai TC","Kaiti TC","BiauKai","DFKai-SB","標楷體",serif;--sans:"Huninn","Noto Sans TC","PingFang TC","Microsoft JhengHei","Noto Sans CJK TC",sans-serif;--hand:"Iansui","LXGW WenKai TC","Kaiti TC","DFKai-SB","標楷體",cursive;color-scheme:light;box-sizing:border-box}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0c1719;--paper:#132227;--paper2:#1a2d33;--ink:#e3ece8;--soft:#8fa6ad;--line:#28414a;--rule:#223940;--margin:#ef8a6e;--p1:#ef8a6e;--p2:#6fb4dc;--p3:#6fd0b4;--p4:#f0c35c;--p4b:#cfa06a;--p5:#ab9de8;--shadow:rgba(0,0,0,.5);--grid:rgba(111,208,180,.05);--glow:rgba(111,180,220,.12);color-scheme:dark}}
:root[data-theme="dark"]{--bg:#0c1719;--paper:#132227;--paper2:#1a2d33;--ink:#e3ece8;--soft:#8fa6ad;--line:#28414a;--rule:#223940;--margin:#ef8a6e;--p1:#ef8a6e;--p2:#6fb4dc;--p3:#6fd0b4;--p4:#f0c35c;--p4b:#cfa06a;--p5:#ab9de8;--shadow:rgba(0,0,0,.5);--grid:rgba(111,208,180,.05);--glow:rgba(111,180,220,.12);color-scheme:dark}
*{box-sizing:border-box}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;padding:env(safe-area-inset-top,0px) 0 env(safe-area-inset-bottom,0px);min-height:100vh;display:flex;flex-direction:column;background-color:var(--bg);color:var(--ink);font-family:var(--sans);font-size:1.02rem;line-height:1.8;
 background-image:radial-gradient(1100px 460px at 50% -8%,var(--glow),transparent 72%),linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:auto,32px 32px,32px 32px;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
input{-webkit-user-select:text;user-select:text}
img{-webkit-user-drag:none}
.bgdeco{position:fixed;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none;color:var(--ink);opacity:.07}
.wrap{width:100%;max-width:940px;margin:0 auto;padding:14px 16px 40px;flex:1}
.bar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:6px}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:700;font-size:1.12rem;letter-spacing:.06em;color:var(--ink);text-decoration:none}
.brand svg{width:30px;height:30px}
.back{color:var(--ink);text-decoration:none;font-size:.95rem;border-bottom:1px solid var(--line);padding-bottom:1px}
.back:hover{color:var(--p2);border-color:var(--p2)}
.ruler{height:14px;margin:8px 0 2px;border-top:1px solid var(--soft);opacity:.5;background-image:linear-gradient(90deg,var(--soft) 1px,transparent 1px),linear-gradient(90deg,var(--soft) 1px,transparent 1px);background-size:8px 6px,40px 13px;background-repeat:repeat-x}
.themes{display:inline-flex;padding:3px;border:1px solid var(--line);border-radius:999px;background:var(--paper)}
.themes button{font:inherit;font-size:.88rem;line-height:1;display:flex;align-items:center;gap:5px;padding:7px 12px;border:0;border-radius:999px;background:transparent;color:var(--soft);cursor:pointer;transition:background .15s,color .15s}
.themes button:hover{color:var(--ink)}
.themes button.on{background:var(--ink);color:var(--paper)}
.themes svg{width:16px;height:16px}
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;align-items:center;margin:10px 0 0}
.hero-art{width:100%;height:auto;max-height:300px}
.eyebrow{margin:14px 0 0;font-size:.78rem;letter-spacing:.28em;color:var(--p1);font-weight:700}
h1.title{font-family:var(--serif);font-size:2.55rem;line-height:1.3;margin:6px 0 4px;font-weight:700;letter-spacing:.02em}
h1.title mark{background:linear-gradient(transparent 68%,color-mix(in srgb,var(--p4) 55%,transparent) 68%);color:inherit;padding:0 3px}
.lead{color:var(--soft);margin:0 0 6px;max-width:34em}
.meta{color:var(--soft);font-size:.88rem;margin:0;font-family:var(--hand);letter-spacing:.04em}
.orn{display:block;width:min(100%,520px);height:18px;margin:14px auto 4px;color:var(--soft)}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 4px}
.sheet{position:relative;margin:24px 0;padding:22px 26px 22px;background:var(--paper);border:1px solid var(--line);border-top:3px solid var(--ink);border-radius:4px 4px 14px 14px;box-shadow:0 18px 32px -24px var(--shadow)}
.sheet::before,.sheet::after{content:"";position:absolute;width:12px;height:12px;border:2px solid var(--p1);opacity:.75;pointer-events:none}
.sheet::before{left:7px;top:9px;border-right:0;border-bottom:0}
.sheet::after{right:7px;bottom:7px;border-left:0;border-top:0}
.sheet h2{font-family:var(--serif);font-size:1.12rem;margin:0 0 4px;font-weight:600;display:flex;align-items:center;flex-wrap:wrap;gap:4px 10px}
.tag{display:inline-flex;align-items:center;gap:6px;font-family:var(--hand);font-weight:400;font-size:.92rem;line-height:1.6;background:var(--ink);color:var(--paper);padding:0 13px 0 10px;border-radius:999px}
.tag svg{width:15px;height:15px;flex:none}
.q{font-family:var(--serif);font-size:1.18rem;font-weight:600;margin:6px 0;line-height:1.75}
.hl{background:linear-gradient(transparent 62%,color-mix(in srgb,var(--p4) 60%,transparent) 62%)}
.stage{margin:10px 0;padding:8px;overflow-x:auto;line-height:1;background-color:var(--paper2);background-image:linear-gradient(var(--rule) 1px,transparent 1px),linear-gradient(90deg,var(--rule) 1px,transparent 1px);background-size:20px 20px;border:1px solid var(--line);border-radius:10px}
.sk{display:block;margin:auto;max-width:100%;height:auto}
.sk text{fill:var(--ink);font-family:inherit}
.ctl{display:flex;align-items:center;gap:10px 12px;flex-wrap:wrap;margin:4px 0}
.ctl label{min-width:6.5em;font-size:.95rem;color:var(--soft)}
.ctl output{min-width:4.2em;text-align:right;font-weight:700;font-variant-numeric:tabular-nums}
.ctl input[type=range]{flex:1;min-width:140px;-webkit-appearance:none;appearance:none;height:6px;border-radius:3px;background:var(--line);outline:none}
.ctl input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--paper);border:2px solid var(--p2);box-shadow:0 1px 5px var(--shadow);cursor:pointer}
.ctl input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:var(--paper);border:2px solid var(--p2);box-shadow:0 1px 5px var(--shadow);cursor:pointer}
.pen{font:inherit;font-size:.95rem;line-height:1.5;padding:3px 17px;border:1px solid var(--ink);border-radius:999px;background:var(--paper);color:var(--ink);cursor:pointer;transition:background .15s,color .15s,transform .1s}
.pen:hover{background:var(--paper2)}
.pen.on{background:var(--ink);color:var(--paper)}
.pen.go{background:var(--p1);border-color:var(--p1);color:#fff}
.pen:active{transform:translateY(1px)}
.eq{margin-top:12px;padding:8px 16px;border-left:3px solid var(--p4);border-radius:0 8px 8px 0;background:color-mix(in srgb,var(--p4) 13%,var(--paper))}
.eq b{color:var(--p1)}
ol.steps{margin:6px 0 0;padding:0;list-style:none;counter-reset:s}
ol.steps li{counter-increment:s;position:relative;padding-left:38px;margin:8px 0}
ol.steps li::before{content:counter(s);position:absolute;left:0;top:4px;width:25px;height:25px;border-radius:50%;background:var(--ink);color:var(--paper);display:grid;place-items:center;font-size:.8rem;line-height:1}
input.num.txt{width:min(18em,100%);text-align:left}
input.num{font:inherit;width:6.5em;padding:3px 10px;border:1px solid var(--ink);border-radius:8px;background:var(--paper);color:var(--ink);text-align:center}
.fb{min-height:32px;font-weight:700}.ok{color:var(--p3)}.no{color:var(--p1)}
/* 目錄（首頁） */
details.sheet{padding-top:16px}
summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:12px;font-family:var(--serif);font-size:1.15rem}
summary::-webkit-details-marker{display:none}
summary::after{content:"";margin-left:auto;width:9px;height:9px;border-right:2px solid var(--soft);border-bottom:2px solid var(--soft);transform:rotate(45deg);transition:transform .2s}
details[open]>summary::after{transform:rotate(-135deg)}
summary small{font-family:var(--sans);color:var(--soft);font-size:.86rem}
.chap{display:flex;align-items:baseline;gap:10px;margin:16px 0 4px}
.chap .no{font-family:var(--hand);color:var(--p1);white-space:nowrap}
.chap b{font-family:var(--serif);font-weight:600}
.chap .dots{flex:1;min-width:20px;border-bottom:2px dotted var(--soft);opacity:.55;transform:translateY(-5px)}
.chap .cnt{color:var(--soft);font-size:.84rem;white-space:nowrap}
.secs{display:flex;flex-wrap:wrap;gap:6px 8px;margin:0 0 2px}
.lnk,.todo{display:inline-block;font-size:.92rem;line-height:1.5;padding:2px 12px;border-radius:999px;text-decoration:none}
.lnk{color:var(--ink);border:1px solid var(--p2);background:color-mix(in srgb,var(--p2) 9%,var(--paper));transition:background .15s}
.lnk:hover{background:color-mix(in srgb,var(--p2) 22%,var(--paper))}
.todo{color:var(--soft);border:1px dashed var(--soft);opacity:.8}
.foot{text-align:center;padding:26px 10px 22px;margin-top:10px;border-top:1px solid var(--line);color:var(--soft)}
.foot img{border:0;margin-bottom:6px;width:88px;height:31px}
.foot span{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.85rem}
.katex{font-size:1.08em}.katex-display{margin:.4em 0;overflow-x:auto;overflow-y:hidden}.eq .katex,.q .katex{font-size:1.1em}
@media (max-width:640px){.hero{grid-template-columns:1fr}.hero-art{max-height:230px}h1.title{font-size:2.05rem}.sheet{padding:20px 16px}}

/* ===== 手繪加強：不規則邊框、雙線素描框、波浪底線（皆為純 CSS，不用濾鏡所以不會變糊） ===== */
.sheet{border:2px solid var(--ink);border-radius:20px 7px 18px 9px/9px 18px 7px 20px;outline:1.5px dashed color-mix(in srgb,var(--ink) 28%,transparent);outline-offset:-8px}
.stage{border-radius:14px 6px 12px 8px/8px 12px 6px 14px;border-width:1.6px}
.eq{border-radius:3px 12px 10px 14px/14px 10px 12px 3px}
.pen,.lnk,.todo,.tag,.chip{border-width:1.6px;border-radius:22px 10px 20px 12px/12px 20px 10px 22px}
.tag{border-radius:18px 8px 16px 9px/9px 16px 8px 18px}
h1.title{font-weight:700;letter-spacing:.04em}
h1.title mark{padding:0 6px 6px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 8' preserveAspectRatio='none'%3E%3Cpath d='M0 4Q6 0 12 4T24 4T36 4T48 4T60 4T72 4T84 4T100 4' fill='none' stroke='%23d9a93c' stroke-width='2.4' stroke-linecap='round' vector-effect='non-scaling-stroke'/%3E%3C/svg%3E") left bottom/100% 9px no-repeat,linear-gradient(transparent 62%,color-mix(in srgb,var(--p4) 38%,transparent) 62%)}
.sheet h2,.q,.chap b,summary,.brand{font-family:var(--serif)}
.meta,.prog,.clock{font-family:var(--hand)}
.chip{display:inline-flex;align-items:center;gap:6px;font-family:var(--hand);font-size:.95rem;line-height:1.5;padding:3px 14px;border:1.6px solid var(--ink);background:color-mix(in srgb,var(--p4) 30%,var(--paper));color:var(--ink);text-decoration:none}
.chip:hover{background:color-mix(in srgb,var(--p4) 50%,var(--paper))}
.opts{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0}.opts .pen{font-size:1.1rem;padding:5px 22px}
.pen.sel{background:var(--p2);border-color:var(--p2);color:#fff}.pen[disabled]{opacity:.55;cursor:default}
.opts .pen.right{background:var(--p3);border-color:var(--p3);color:#fff;opacity:1}.opts .pen.wrong{background:var(--p1);border-color:var(--p1);color:#fff;opacity:1}
.nextlist{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:8px;margin:6px 0 14px}.nx small{color:var(--soft)}
.foot{margin-top:auto;padding:22px 16px 28px;text-align:center;color:var(--soft);font-size:.82rem;line-height:1.7}.foot p{margin:4px 0}.foot a{color:inherit}
.tabs .pen.go{font-weight:700}
/* 學習地圖與學習軌跡 */
.lmap .lm-row,.lm-detail .lm-row{display:flex;flex-wrap:wrap;gap:6px 8px;align-items:center;margin:8px 0}
.lm-row>b{font-weight:600;margin-right:4px}
.lm-det{margin-top:10px}.lm-det summary{cursor:pointer;color:var(--soft);font-size:.92rem}
.lm-tags{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.lm-tag{display:inline-flex;flex-direction:column;padding:3px 10px;border:1px solid var(--line);border-radius:10px;background:var(--paper2);line-height:1.35}
.lm-tag small{color:var(--soft);font-size:.72rem}.lm-tag b{font-weight:500;font-size:.9rem}
.lm-all{margin-top:8px}
.lm-filter{display:flex;flex-direction:column;gap:8px;margin:10px 0 4px}
.lm-fg{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.lm-fl{min-width:5.2em;color:var(--soft);font-size:.9rem}
.lm-fg .pen{padding:1px 12px;font-size:.88rem}
.lm-row2{display:flex;align-items:stretch;gap:6px;overflow-x:auto;padding:6px 2px 10px;-webkit-overflow-scrolling:touch}
.lm-arrow{align-self:center;color:var(--soft);flex:none}
.lm-node{flex:none;display:flex;flex-direction:column;align-items:flex-start;gap:0;min-width:104px;max-width:150px;text-align:left;font:inherit;line-height:1.35;padding:6px 12px;border:1.6px solid var(--ink);border-left-width:6px;border-radius:12px;background:var(--paper);color:var(--ink);cursor:pointer}
.lm-node.dN{border-left-color:var(--p2)}.lm-node.dS{border-left-color:var(--p3)}.lm-node.dR{border-left-color:var(--p5)}.lm-node.dD{border-left-color:var(--p4)}
.lm-node small{color:var(--soft);font-size:.74rem}.lm-node b{font-weight:600;font-size:.92rem}.lm-node em{font-style:normal;color:var(--soft);font-size:.74rem}
.lm-node:hover{background:var(--paper2)}.lm-node.seen{background:color-mix(in srgb,var(--p3) 14%,var(--paper))}
.lm-node.here{outline:2px solid var(--p1);outline-offset:2px}.lm-node.dim,.lm-sec.dim{opacity:.35}
.lm-detail{margin:6px 0 4px;padding:12px 14px;border:1px dashed var(--soft);border-radius:12px;background:var(--paper2)}
.lm-detail h3{margin:0 0 4px;font-family:var(--serif);font-size:1.02rem}
.lm-secs{display:flex;flex-direction:column;gap:4px;margin:8px 0}
.lm-sec{display:flex;flex-wrap:wrap;gap:4px 10px;align-items:center}.lm-sec small{color:var(--soft)}
.lm-st{font-size:.74rem;padding:0 8px;border-radius:999px;border:1px solid var(--p3);color:var(--p3)}
.lnk.seen::after{content:"";display:inline-block;width:7px;height:7px;margin-left:7px;border-radius:50%;background:var(--p4);vertical-align:middle}
.lnk.fin::after{background:var(--p3);width:9px;height:5px;border-radius:0;border:solid var(--p3);border-width:0 0 2px 2px;background:none;transform:rotate(-45deg) translateY(-2px)}
.resume{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;margin:14px 0 2px;padding:10px 16px;border:1px solid var(--line);border-radius:14px;background:var(--paper)}
.resume b{font-family:var(--serif);font-weight:600}.resume small{color:var(--soft)}
.maplink{display:inline-block;margin:0 0 0 4px}

/* 鎂光燈導覽 */
.tour-i{position:fixed;left:14px;bottom:calc(14px + env(safe-area-inset-bottom,0px));z-index:40;width:42px;height:42px;padding:0;display:grid;place-items:center;border-radius:50%;border:1.6px solid var(--ink);background:var(--paper);color:var(--ink);cursor:pointer;box-shadow:0 6px 16px -6px var(--shadow)}
.tour-i:hover{background:var(--paper2)}.tour-i[hidden]{display:none}
.tour{position:fixed;inset:0;z-index:2000}
.tour-block{position:absolute;inset:0}
.tour-hole{position:fixed;border-radius:14px;box-shadow:0 0 0 100vmax rgba(8,12,20,.78),0 0 0 2px var(--p4) inset;pointer-events:none;transition:left .22s,top .22s,width .22s,height .22s}
.tour-card{position:fixed;padding:14px 16px 12px;background:var(--paper);color:var(--ink);border:1.6px solid var(--ink);border-radius:16px;box-shadow:0 18px 40px -12px rgba(0,0,0,.55);line-height:1.6;max-height:calc(100vh - 24px);overflow:auto}
.tour-card h3{margin:0 0 4px;font-family:var(--serif);font-size:1.08rem}
.tour-card p{margin:0 0 10px;font-size:.95rem}
.tour-ft{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}
.tour-act{display:flex;gap:6px}.tour-dots{color:var(--soft);font-size:.84rem}
.tour-card .pen{padding:2px 14px;font-size:.9rem}
@media (prefers-reduced-motion:reduce){.tour-hole{transition:none}}
@media print{.tour-i,.tour{display:none!important}}
/* ---- 數光群島（3D 單元目錄） ---- */
.i3{position:relative;width:100vw;margin-left:calc(50% - 50vw);height:calc(100vh - 92px);height:calc(100dvh - 92px);min-height:540px;overflow:hidden;color:#101a2e;font-family:"Noto Sans TC","Microsoft JhengHei",sans-serif}
.i3-cv{position:absolute;inset:0;touch-action:none;cursor:grab;display:block;z-index:0}.i3>:not(.i3-cv){z-index:1}.i3>.i3-panel{z-index:2}
.i3-intro{position:absolute;left:16px;top:14px;max-width:340px;background:rgba(255,255,255,.9);padding:10px 14px;border-radius:14px;border:1.5px solid #101a2e;box-shadow:3px 3px 0 rgba(16,26,46,.25)}
.i3-intro h1{margin:0;font-size:1.45rem;font-family:var(--serif)}.i3-intro p{margin:4px 0;font-size:.88rem;line-height:1.55}.i3-hint{display:block;color:#4a5670;font-size:.8rem}
.i3-leg{list-style:none;padding:0;margin:6px 0 0;display:flex;flex-wrap:wrap;gap:4px 12px;font-size:.8rem}.i3-leg i{display:inline-block;width:.9em;height:.9em;border-radius:3px;margin-right:4px;vertical-align:-1px;border:1px solid #101a2e}
.i3-tools{position:absolute;right:16px;top:14px;display:flex;flex-direction:column;gap:6px;align-items:flex-end;max-width:min(470px,58vw)}
.i3-row{display:flex;flex-wrap:wrap;gap:5px;justify-content:flex-end}.i3 .pen{background:rgba(255,255,255,.92);color:#101a2e;border-color:#101a2e;font-size:.85rem;padding:4px 10px}.i3 .pen.on{background:#101a2e;color:#fff}
.i3-find{position:relative;width:min(320px,58vw)}.i3-find input{width:100%;box-sizing:border-box;padding:7px 12px;border:1.5px solid #101a2e;border-radius:999px;font:inherit;background:#fff;color:#101a2e}
.i3-res{position:absolute;right:0;top:calc(100% + 4px);width:min(360px,92vw);max-height:50vh;overflow:auto;background:#fff;border:1.5px solid #101a2e;border-radius:12px;padding:4px;z-index:3;box-shadow:3px 3px 0 rgba(16,26,46,.2)}
.i3-res button{display:block;width:100%;text-align:left;background:none;border:0;border-bottom:1px dashed #c8cfdc;padding:7px 8px;font:inherit;color:#101a2e;cursor:pointer}.i3-res button:hover,.i3-res button:focus{background:#eef4ff}.i3-res small{display:block;color:#5a6680;font-size:.78rem}.i3-res .meta{margin:6px 8px}
.i3-panel{position:absolute;right:16px;top:150px;bottom:16px;width:min(370px,92vw);overflow:auto;background:#fffdf7;border:1.5px solid #101a2e;border-radius:16px;padding:12px 14px;box-shadow:4px 4px 0 rgba(16,26,46,.25);z-index:2}
.i3-panel h2{margin:2px 0;font-family:var(--serif);font-size:1.4rem}.i3-x{position:absolute;right:10px;top:8px;border:0;background:none;font-size:1.6rem;line-height:1;cursor:pointer;color:#101a2e}
.i3-dom{display:inline-block;margin:0;padding:1px 10px;border-radius:999px;font-size:.78rem;border:1px solid #101a2e}.i3-dN{background:#cfeccc}.i3-dS{background:#c8ecf2}.i3-dR{background:#e6dafa}.i3-dD{background:#fde2bd}
.i3-ch{border-top:1px dashed #c8cfdc;padding:6px 0}.i3-ch summary{cursor:pointer;display:flex;flex-wrap:wrap;align-items:center;gap:4px 8px}.i3-ch summary small{color:#5a6680;font-size:.78rem;margin-left:auto}
.i3-g{display:inline-block;padding:0 8px;border-radius:6px;font-size:.78rem;border:1px solid #101a2e}.i3-ch .secs{display:flex;flex-direction:column;gap:2px;margin:6px 0 4px 12px}.i3-ch .secs .lnk{font-size:.92rem}
.i3-nb{margin-top:10px;border-top:1.5px solid #101a2e;padding-top:6px}.i3-nbt{margin:6px 0 3px;font-size:.82rem;font-weight:700}.i3-chip{border:1.2px solid #101a2e;background:#fff;border-radius:999px;padding:2px 10px;margin:2px 4px 2px 0;font:inherit;font-size:.85rem;cursor:pointer;color:#101a2e}
.i3-resume{position:absolute;left:70px;bottom:16px;background:rgba(255,255,255,.92);border:1.5px solid #101a2e;border-radius:12px;padding:6px 12px;color:#101a2e;text-decoration:none;max-width:60vw}.i3-resume small{display:block;font-size:.75rem;color:#5a6680}
.i3-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.i3-sr:focus-within{position:absolute;left:16px;bottom:70px;width:auto;height:auto;clip:auto;background:#fff;border:1.5px solid #101a2e;border-radius:12px;padding:8px;max-height:50%;overflow:auto;z-index:4}.i3-sr ul{list-style:none;margin:0;padding:0}.i3-sr button{font:inherit;background:none;border:0;padding:3px 4px;cursor:pointer;color:#101a2e}

@media (max-width:640px){.i3{height:calc(100dvh - 80px);min-height:560px}.i3-intro{left:8px;right:8px;top:8px;max-width:none;padding:6px 10px}.i3-intro h1{font-size:1.1rem}.i3-intro p{display:none}.i3-leg{font-size:.72rem;gap:2px 8px;margin-top:2px}
 .i3-tools{left:8px;right:8px;top:auto;bottom:8px;max-width:none;align-items:stretch}.i3-find{width:100%}.i3-row{justify-content:flex-start}.i3-grades{flex-wrap:nowrap;overflow-x:auto}.i3 .pen{font-size:.78rem;padding:3px 8px;white-space:nowrap}
 .i3-res{top:auto;bottom:calc(100% + 4px);width:100%}
 .i3-panel{left:0;right:0;top:auto;bottom:0;width:auto;max-height:62%;border-radius:16px 16px 0 0}.i3-resume{display:none}}
body:has(.i3page){overflow-x:hidden}
.i3-hud{display:flex;align-items:center;gap:6px;margin-top:6px;font-size:.8rem;flex-wrap:wrap}.i3-hud span:first-child{font-weight:700}.i3-bar{display:inline-block;width:80px;height:8px;border:1.2px solid #101a2e;border-radius:6px;overflow:hidden;background:#fff}.i3-bar i{display:block;height:100%;background:linear-gradient(90deg,#ffd65a,#ff9f6e)}
@media (max-width:640px){.i3-tools{left:60px}.i3-hud{font-size:.72rem;margin-top:2px}}
/* 3D 群島（three.js）：上層 canvas、工具列、時間軸、主題索引、島民日誌 */
.i3>.i3-ov{position:absolute;inset:0;pointer-events:none;z-index:0}
.i3>.i3-idx,.i3>.i3-res{z-index:2}
.i3-tb .pen{min-width:3.6em}
.i3-clock{position:absolute;left:50%;transform:translateX(-50%);bottom:16px;display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.92);border:1.5px solid #101a2e;border-radius:999px;padding:5px 8px 5px 14px;box-shadow:3px 3px 0 rgba(16,26,46,.22);font-size:.82rem;width:min(460px,46vw);box-sizing:border-box}
.i3-clock input{flex:1;accent-color:#101a2e;min-width:60px}.i3-ck-t{font-weight:700;font-variant-numeric:tabular-nums;min-width:3em}.i3-ck-e{color:#5a6680;font-size:.75rem}
.i3-log{position:absolute;right:16px;bottom:16px;width:min(300px,30vw);background:rgba(16,26,46,.86);color:#eef3ff;border-radius:14px;padding:6px 10px 8px;font-size:.8rem;box-shadow:3px 3px 0 rgba(16,26,46,.25)}
.i3-log-h{all:unset;cursor:pointer;display:flex;align-items:center;gap:6px;font-weight:700;font-size:.82rem;width:100%}.i3-log-h b{background:#e5484d;color:#fff;border-radius:4px;padding:0 5px;font-size:.68rem;letter-spacing:.05em}
.i3-live{width:8px;height:8px;border-radius:50%;background:#ff5a5f;box-shadow:0 0 0 0 rgba(255,90,95,.7);animation:i3pulse 1.6s infinite}
@keyframes i3pulse{0%{box-shadow:0 0 0 0 rgba(255,90,95,.7)}70%{box-shadow:0 0 0 7px rgba(255,90,95,0)}100%{box-shadow:0 0 0 0 rgba(255,90,95,0)}}
@media (prefers-reduced-motion:reduce){.i3-live{animation:none}}
.i3-log ol{list-style:none;margin:4px 0 0;padding:0;display:flex;flex-direction:column;gap:2px}.i3-log li{display:flex;gap:6px;line-height:1.4;animation:i3in .35s ease-out}.i3-log li:not(:first-child){opacity:.72}.i3-log time{color:#9fb2d8;font-variant-numeric:tabular-nums;flex:none}
@keyframes i3in{from{opacity:0;transform:translateY(-4px)}}
.i3-log.shut ol{display:none}
.i3:has(.i3-panel:not([hidden])) .i3-log{display:none}
.i3-idx{position:absolute;left:16px;top:14px;bottom:70px;width:min(270px,80vw);overflow:auto;background:#fffdf7;border:1.5px solid #101a2e;border-radius:16px;padding:10px 12px;box-shadow:4px 4px 0 rgba(16,26,46,.25)}
.i3-idx-h{display:flex;align-items:center;justify-content:space-between;position:relative;margin-bottom:4px}.i3-idx-h .i3-x{position:static}
.i3-idx-d{margin-top:8px}.i3-idx-d>div{display:flex;flex-direction:column;margin-top:4px}
.i3-idx-i{display:flex;justify-content:space-between;gap:8px;background:none;border:0;border-bottom:1px dashed #d4d9e3;padding:5px 4px;font:inherit;font-size:.9rem;color:#101a2e;cursor:pointer;text-align:left}.i3-idx-i small{color:#5a6680}.i3-idx-i:hover,.i3-idx-i:focus{background:#eef4ff}.i3-idx-i.on{background:#101a2e;color:#fff;border-radius:6px}.i3-idx-i.on small{color:#cfd8ea}
.i3.idx-on .i3-resume,.i3.idx-on .i3-intro{display:none}
@media (max-width:900px){.i3-log{width:min(260px,40vw);bottom:72px}.i3-clock{width:min(420px,60vw)}}
@media (max-width:640px){
 .i3-clock{left:8px;right:8px;transform:none;top:92px;bottom:auto;width:auto;padding:3px 6px 3px 10px;font-size:.75rem}.i3-ck-e{display:none}
 .i3-log{right:8px;top:132px;bottom:auto;width:auto;max-width:72vw;font-size:.74rem;padding:4px 8px}
 .i3-idx{left:0;right:0;top:auto;bottom:0;width:auto;max-height:62%;border-radius:16px 16px 0 0;z-index:3}
 .i3-tb{flex-wrap:nowrap;overflow-x:auto}}
/* 群島日誌分頁、導覽播放列、領域複選 */
.i3-log[hidden],.i3-play[hidden],.i3-clock[hidden]{display:none}
.i3-log-top{display:flex;align-items:center;gap:6px}.i3-log-top .i3-x{position:static;color:#cfd8ea;font-size:1.3rem;margin-left:auto}
.i3-log-tabs{display:flex;gap:4px;margin:6px 0 4px}.i3-log-tabs button{flex:1;background:transparent;border:1px solid rgba(255,255,255,.35);color:#cfd8ea;border-radius:999px;padding:2px 8px;font:inherit;font-size:.76rem;cursor:pointer}.i3-log-tabs button.on{background:#fff;color:#101a2e;border-color:#fff}
.i3-log.shut .i3-log-tabs,.i3-log.shut .i3-log-sum,.i3-log.shut .i3-log-l{display:none}
.i3-log-sum[hidden],.i3-log-l[hidden]{display:none}
.i3-guide{display:flex;gap:8px;align-items:center;margin:4px 0 6px;line-height:1.45}
.i3-gface{flex:none;width:30px;height:26px;background:#ffcf5a;border:2px solid #fff;border-radius:50% 50% 42% 42%;position:relative}.i3-gface:before,.i3-gface:after{content:"";position:absolute;top:8px;width:5px;height:5px;border-radius:50%;background:#101a2e}.i3-gface:before{left:7px}.i3-gface:after{right:7px}
.i3-tours{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.i3-tours button{all:unset;cursor:pointer;display:grid;grid-template-columns:auto 1fr auto;grid-template-rows:auto auto;column-gap:8px;width:100%;box-sizing:border-box;padding:5px 8px;border-radius:10px;background:rgba(255,255,255,.08)}.i3-tours button:hover,.i3-tours button:focus-visible{background:rgba(255,255,255,.18)}
.i3-tn{grid-row:1/3;align-self:center;font-weight:700;color:#ffd65a;font-variant-numeric:tabular-nums}.i3-tours b{font-size:.84rem}.i3-tours small{grid-column:2;color:#9fb2d8;font-size:.72rem}.i3-tp{grid-row:1/3;grid-column:3;align-self:center;width:24px;height:24px;border-radius:50%;background:#ffd65a;color:#101a2e;display:grid;place-items:center;font-size:.7rem}
.i3-play{position:absolute;left:50%;transform:translateX(-50%);bottom:16px;width:min(620px,60vw);box-sizing:border-box;background:rgba(255,255,255,.95);border:1.5px solid #101a2e;border-radius:16px;padding:8px 12px;box-shadow:3px 3px 0 rgba(16,26,46,.22)}
.i3-pl-cap{margin:0 0 6px;font-size:.95rem;font-weight:700;line-height:1.5;min-height:1.5em}
.i3-pl-c{display:flex;align-items:center;gap:5px;flex-wrap:wrap}.i3-pl-n{font-variant-numeric:tabular-nums;font-size:.82rem}.i3-pl-bar{flex:1;min-width:50px;height:6px;border-radius:4px;background:#dfe4ee;overflow:hidden}.i3-pl-bar i{display:block;height:100%;background:#101a2e;transition:width .4s}
.i3.touring .i3-grades,.i3.touring .i3-find{opacity:.5;pointer-events:none}
.i3-idx-s{font-size:.8rem;margin:2px 0 6px}.i3-idx-f{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:4px}.i3-idx-f button{cursor:pointer;font:inherit;font-size:.76rem;color:#101a2e;opacity:.6}.i3-idx-f button.sel{opacity:1;box-shadow:0 0 0 2px #101a2e;font-weight:700}
@media (max-width:900px){.i3-play{width:min(560px,70vw)}}
@media (max-width:640px){.i3-play{left:8px;right:8px;top:92px;bottom:auto;transform:none;width:auto;padding:6px 8px}.i3-pl-cap{font-size:.82rem}.i3-play .pen{padding:2px 6px}.i3-pl-skip{display:none}
 .i3-log-tabs button{font-size:.72rem}}
@media (max-width:640px){.i3.touring .i3-log{display:none}}

/* ===== 見微理畫：理化單元 ===== */
.lab .stage{margin:8px 0}
.seg{display:inline-flex;flex-wrap:wrap;gap:5px}.seg .pen{padding:2px 13px;font-size:.9rem}
.btns{gap:6px}
.unit{color:var(--soft);font-size:.95rem}
.num{width:8.5em;padding:5px 10px;border:1.6px solid var(--ink);border-radius:10px;background:var(--paper);color:var(--ink);font:inherit}
.chs{display:flex;flex-direction:column;gap:14px}.chq{padding-bottom:10px;border-bottom:1.5px dashed var(--line)}.chq:last-child{border-bottom:0}
.chn{display:inline-grid;place-items:center;width:1.6em;height:1.6em;margin-right:8px;border:1.6px solid var(--ink);border-radius:50%;font-family:var(--hand);font-size:.9rem;vertical-align:2px}
.opts{flex-direction:column;align-items:stretch}.opts .pen.opt{text-align:left;font-size:1rem;padding:5px 16px}
.opts .pen.right{background:var(--p3);border-color:var(--p3);color:#fff}.opts .pen.wrong{background:color-mix(in srgb,var(--p1) 18%,var(--paper));border-color:var(--p1)}
.pen.hint{align-self:flex-start}
.keyb{margin-top:12px;padding:10px 16px;border:1.6px solid var(--p3);border-radius:14px 6px 12px 8px/8px 12px 6px 14px;background:color-mix(in srgb,var(--p3) 8%,var(--paper))}
.keyb b{display:inline-flex;align-items:center;gap:6px;font-family:var(--hand);color:var(--p3)}.keyb b svg{width:15px;height:15px}.keyb ul{margin:4px 0 0;padding-left:1.3em}
.ltbl{overflow-x:auto;margin:6px 0}.ltbl .tb{border-collapse:collapse;font-size:.92rem;min-width:60%}.ltbl th,.ltbl td{border:1px solid var(--line);padding:3px 10px;text-align:center}.ltbl th{background:var(--paper2);font-weight:600}
.lpane[hidden]{display:none}
.lab .note{font-size:.9rem;color:var(--soft);margin:4px 0}
.chip{display:inline-flex;align-items:center;gap:6px;font-family:var(--hand);font-size:.95rem;line-height:1.4;padding:3px 14px;border:1.6px solid var(--ink);color:var(--ink);text-decoration:none;background:color-mix(in srgb,var(--p4) 30%,var(--paper))}
/* 首頁導覽頁 */
.feats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}.feat{padding:14px 16px;background:var(--paper);border:1.6px solid var(--ink);border-radius:18px 7px 16px 9px/9px 16px 7px 18px}
.feat b{font-family:var(--hand);color:var(--p1)}.feat h3{margin:2px 0;font-family:var(--serif)}.feat p{margin:0;color:var(--soft);font-size:.94rem}
.ctas{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}.pen.big{font-size:1.05rem;padding:6px 22px;text-decoration:none;display:inline-block}a.pen{color:var(--ink)}a.pen.go{color:#fff}
@media (max-width:640px){.feats{grid-template-columns:1fr}}
/* 群島面板：章標題＋小節 */
.i3-chg{padding:8px 0}.i3-cht{margin:0 0 4px;display:flex;align-items:center;gap:8px}.i3-cht b{font-family:var(--serif);font-weight:600}
.i3-chg .secs{margin-left:4px}.i3 .lnk.here{outline:2px solid #e5534b;outline-offset:2px}
.i3-dN{background:#cdeee2}.i3-dS{background:#fde2bd}.i3-dR{background:#d4e3fa}.i3-dD{background:#e9dcfa}
.sortg .cards{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 10px}.sortg .card{font-size:.92rem;padding:3px 12px}
.sortg .bins{display:grid;grid-template-columns:1fr 1fr;gap:10px}.sortg .bin{min-height:110px;padding:8px 10px;border:1.6px dashed var(--ink);border-radius:14px;cursor:pointer;background:var(--paper2)}
.sortg .bin b{font-family:var(--serif)}.sortg .bin small{display:block;color:var(--soft);font-size:.8rem}.sortg .bin>div{display:flex;flex-wrap:wrap;gap:5px;margin-top:6px}.sortg .bin .pen{font-size:.85rem;padding:1px 10px}
.pen.right{background:var(--p3);border-color:var(--p3);color:#fff}.pen.sel{background:var(--p2);border-color:var(--p2);color:#fff}
@media (max-width:640px){.lab .stage .sk{min-width:540px}}
.coef{gap:6px 10px;flex-wrap:wrap}.coef .arr{font-size:1.3rem;font-weight:700;color:var(--soft)}.coef .cf{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border:1.4px dashed var(--line);border-radius:12px}
.coef .cf b{min-width:1em;text-align:center;font-size:1.2rem;color:var(--p1)}.coef .cf .fm{font-size:1.15rem;font-weight:700}.coef .pen{padding:0 9px;font-size:1rem;line-height:1.4}

/* 群島地圖 */
.lm-map{overflow:auto;border:1px solid var(--line);border-radius:18px;background:var(--paper);box-shadow:0 24px 48px -34px var(--shadow);margin:12px 0 4px;-webkit-overflow-scrolling:touch;max-height:78vh}
.mapsvg{display:block}
.lm-sem{font-family:var(--serif);font-size:15px;fill:var(--soft)}
.lm-gl{stroke:var(--line);stroke-width:1;stroke-dasharray:3 6;fill:none}
.lm-band .bd{opacity:.1;stroke:currentColor;stroke:var(--ink);stroke-opacity:.2;stroke-width:1.4;stroke-dasharray:4 7;transition:opacity .4s}
.lm-band.on .bd{opacity:.24}.lm-band.off .bd{opacity:.04}
.lm-dn{font-family:var(--serif);font-size:18px;font-weight:700;fill:var(--ink);opacity:.8;transition:opacity .4s}.lm-band.off .lm-dn{opacity:.25}
.lm-e{stroke-width:1.4;stroke-linecap:round;opacity:.22;transition:opacity .3s,stroke-width .3s}
.lm-e.dN{stroke:var(--p2)}.lm-e.dS{stroke:var(--p3)}.lm-e.dR{stroke:var(--p5)}.lm-e.dD{stroke:var(--p4)}
.lm-e.hi{opacity:.95;stroke-width:2.8;stroke-dasharray:7 7;animation:lmflow 1.2s linear infinite}
.lm-e.dim{opacity:.05}
@keyframes lmflow{to{stroke-dashoffset:-14}}
.lm-n{cursor:pointer;outline:none;transition:opacity .3s}
.lm-n .isl{stroke:var(--ink);stroke-width:2;fill-opacity:.55;transition:fill-opacity .3s}
.lm-n.seen .isl{fill-opacity:.95}
.lm-n .ck{fill:none;stroke:var(--ink);stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.lm-n.here .isl{stroke:var(--p1);stroke-width:3.2}
.lm-n.sel .isl{stroke-width:3.4;fill-opacity:1}
.lm-n.glow .isl{filter:url(#lmglow);fill-opacity:1}
.lm-n.dim{opacity:.16}
.lm-n:hover .isl,.lm-n:focus-visible .isl{fill-opacity:1;stroke-width:3}
.lm-nl{font-size:11.5px;fill:var(--ink);paint-order:stroke;stroke:var(--paper);stroke-width:3px;stroke-linejoin:round}
.lm-hop{pointer-events:none}
.lm-info{margin-top:10px}
.lm-hint{text-align:center}
.lm-tour{margin-top:8px}
.lm-fg select{font:inherit;font-size:.9rem;padding:2px 10px;border:1px solid var(--ink);border-radius:999px;background:var(--paper);color:var(--ink)}
@media (prefers-reduced-motion:reduce){.lm-e.hi{animation:none}}

.lm-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:14px}
@media (min-width:1000px){.lm-grid{grid-template-columns:minmax(0,1fr) 330px;align-items:start}.lm-info{position:sticky;top:12px;margin-top:12px;max-height:calc(100vh - 24px);overflow:auto}}
.lm-map{max-height:72vh}

/* 海面與沙洲小島 */
:root{--sea:#cfe9ec;--sea2:#b6dce3;--sand:#f0dfae;--wv:#fff;--hop:#fff}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--sea:#14283a;--sea2:#0f2132;--sand:#7a6a45;--wv:#8fb6d8}}
:root[data-theme="dark"]{--sea:#14283a;--sea2:#0f2132;--sand:#7a6a45;--wv:#8fb6d8}
.lm-map{background:var(--sea)}
.lm-sea{fill:var(--sea)}
.lm-waves .wv{fill:none;stroke:var(--wv);stroke-width:1.6;stroke-linecap:round;opacity:.55}
.lm-band .bd{fill-opacity:.16;stroke:var(--wv);stroke-opacity:.7;stroke-width:1.6}
.lm-band.on .bd{fill-opacity:.3}.lm-band.off .bd{fill-opacity:.04;stroke-opacity:.25}
.lm-dn{fill:var(--ink);opacity:.7}
.lm-sem{fill:var(--ink);opacity:.7}
.lm-gl{stroke:var(--wv);stroke-opacity:.7}
.lm-e{stroke:var(--wv)!important;opacity:.55;stroke-width:1.8;stroke-dasharray:2 7}
.lm-e.hi{stroke:var(--p1)!important;stroke-dasharray:7 7;opacity:1}
.lm-e.dim{opacity:.08}
.lm-n .rip{fill:none;stroke:var(--wv);stroke-width:1.6;opacity:.8;transform-box:fill-box;transform-origin:center;animation:lmrip 3.2s ease-in-out infinite}
@keyframes lmrip{50%{transform:scale(1.18);opacity:.3}}
.lm-n .sand{fill:var(--sand);stroke:var(--ink);stroke-width:1.6}
.lm-n .isl{stroke:var(--ink);stroke-width:1.6;fill-opacity:.75}
.lm-n .trk{fill:none;stroke:var(--ink);stroke-width:1.6;stroke-linecap:round}
.lm-n .plm{fill:none;stroke:var(--ink);stroke-width:1.4;stroke-linecap:round}
.lm-n.dim .rip{animation:none}
.lm-nl{stroke:var(--sea);fill:var(--ink)}
@media (prefers-reduced-motion:reduce){.lm-n .rip{animation:none}}

/* 海面動態：浪漂移、小船橫越、水面閃光 */
.lm-waves .wv{animation:lmwv 7s ease-in-out infinite alternate}
.lm-waves .wv:nth-child(3n+1){animation-duration:9s;animation-delay:-2s}
.lm-waves .wv:nth-child(3n+2){animation-duration:6s;animation-delay:-4s}
@keyframes lmwv{from{transform:translate(-12px,0)}to{transform:translate(12px,3px)}}
.lm-boat{animation:lmsail linear infinite;pointer-events:none}
@keyframes lmsail{to{transform:translate(calc(var(--dx) - 60px),var(--by,0))}}
.lm-boat .bob{animation:lmbob 3.2s ease-in-out infinite;transform-box:fill-box;transform-origin:center bottom}
@keyframes lmbob{50%{transform:translateY(-3px) rotate(3deg)}}
.lm-spark{pointer-events:none}
.lm-spark circle{fill:#fff;opacity:0;animation:lmtw 4s ease-in-out infinite}
@keyframes lmtw{40%{opacity:.85}60%{opacity:0}}
.lm-sea{animation:lmsea 14s ease-in-out infinite alternate}
@keyframes lmsea{to{filter:brightness(1.06) saturate(1.1)}}
@media (prefers-reduced-motion:reduce){.lm-waves .wv,.lm-boat,.lm-boat .bob,.lm-spark circle,.lm-sea{animation:none}.lm-boats{display:none}.lm-spark circle{opacity:.5}}

.lm-n .plm{fill:#4f9d7a;stroke:var(--ink);stroke-width:1;stroke-linejoin:round}
.lm-codes{margin:4px 0 8px;padding-left:1.2em;font-size:.9rem}.lm-codes li{margin:2px 0}.lm-codes b{font-family:ui-monospace,Menlo,monospace;font-weight:600;margin-right:4px}
.i3-tag{display:inline-block;margin-left:6px;font-size:.72rem;color:var(--soft);font-weight:400}
/* 鑑往知來 */
.exam .ex-top{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;margin:4px 0 8px}
.ex-heat{display:inline-block;padding:2px 12px;border-radius:999px;font-weight:700;font-size:.9rem;border:1.5px solid var(--ink)}
.ex-heat.hot{background:color-mix(in srgb,var(--p1) 30%,var(--paper))}.ex-heat.warm{background:color-mix(in srgb,var(--p4) 35%,var(--paper))}.ex-heat.mild{background:color-mix(in srgb,var(--p3) 22%,var(--paper))}.ex-heat.cool{background:var(--paper2)}
.ex-yrs{display:flex;flex-wrap:wrap;gap:5px;margin:4px 0 10px}
.ex-cols{display:grid;grid-template-columns:minmax(0,1fr);gap:4px 22px}@media (min-width:760px){.ex-cols{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr)}}
.exam h3{font-family:var(--serif);font-size:1rem;margin:8px 0 4px}.exam h3 small{font-weight:400;color:var(--soft);font-size:.78rem;margin-left:8px}
.exam ol,.exam ul{margin:0;padding-left:1.3em}.exam li{margin:3px 0}
.ex-trap li::marker{content:"⚠ "}
.ex-q{margin-top:10px;padding:10px 12px;border:1px dashed var(--soft);border-radius:12px}
.ex-re{margin-left:10px;font-weight:400;font-size:.85rem;padding:0 12px}
.ex-note{margin-top:8px;font-size:.8rem}
/* 鑑往知來 */
.exam .ex-sum{margin:4px 0 10px}
.ex-heat{display:inline-block;padding:0 10px;border-radius:999px;font-size:.85rem;margin-right:6px;border:1.5px solid var(--ink)}
.ex-heat.h3{background:color-mix(in srgb,var(--p1) 30%,var(--paper))}.ex-heat.h2{background:color-mix(in srgb,var(--p4) 35%,var(--paper))}.ex-heat.h1,.ex-heat.h0{background:var(--paper2)}
.ex-cols{display:grid;grid-template-columns:1fr;gap:6px 18px}@media(min-width:760px){.ex-cols{grid-template-columns:1fr 1fr}}
.exam h3{font-size:1rem;margin:6px 0 4px;font-family:var(--serif)}
.ex-f,.ex-t{margin:0;padding-left:1.2em}.ex-f li,.ex-t li{margin:3px 0}
.ex-t li::marker{content:"⚠ "}
.ex-q{margin-top:10px;padding:10px 12px;border:1px dashed var(--soft);border-radius:12px}
.ex-q .opts{display:flex;flex-direction:column;gap:6px;align-items:flex-start}
.ex-q .opt.ok{outline:2.5px solid var(--p3)}.ex-q .opt.no{outline:2.5px solid var(--p1)}
/* 3D 實驗室 */
.l3-wrap{position:relative;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:radial-gradient(ellipse at 50% 30%,var(--paper),var(--paper2));touch-action:none}
.l3-cv{display:block;width:100%;cursor:grab}.l3-cv:active{cursor:grabbing}
.l3-lab{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.l3-t{position:absolute;left:0;top:0;font-size:.8rem;font-weight:600;color:var(--ink);background:color-mix(in srgb,var(--paper) 78%,transparent);padding:0 5px;border-radius:6px;white-space:nowrap}
.l3-t.l3-s{font-weight:500;color:var(--soft)}.l3-t.l3-img{color:var(--p1)}.l3-t.l3-n{background:#d84a3a;color:#fff}.l3-t.l3-sp{background:#3d6fb0;color:#fff}
.l3-t.l3-i{color:#e0523a}.l3-t.l3-f{color:#2fa37a}.l3-t.l3-b{color:#3a8fe0}
.l3-hint{margin:4px 0 8px;text-align:center}
.l3-ctl{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;margin:6px 0}
.l3-sl{display:flex;align-items:center;gap:8px}.l3-sl span{color:var(--soft);font-size:.9rem;min-width:4.5em}.l3-sl input{width:150px}.l3-sl b{min-width:5em;font-weight:600}
.l3-ch{display:flex;flex-wrap:wrap;align-items:center;gap:6px}.l3-ch span{color:var(--soft);font-size:.9rem}.l3-ch .pen{padding:1px 12px;font-size:.9rem}
.l3-out{margin-top:8px}
.l3-plot{display:block;width:100%;height:auto;max-height:130px;border:1px dashed var(--line);border-radius:10px;margin-top:6px}
.rpbtn{position:fixed;right:14px;bottom:calc(14px + env(safe-area-inset-bottom,0px));z-index:50;padding:8px 14px;border:1.5px solid var(--line);border-radius:999px;background:var(--paper);color:var(--soft);font:inherit;font-size:.85rem;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.12)}.rpbtn:hover{color:var(--p2);border-color:var(--p2)}
@media print{.rpbtn{display:none!important}}
.rpbtn{text-decoration:none}
.i3-b-map{text-decoration:none}
.landing .ctas .pen{text-decoration:none}
a.pen,a.pen:hover,a.pen:visited{text-decoration:none}