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16px;padding:13px 16px;border:1px solid color-mix(in srgb,var(--bad) 35%,transparent);border-left:2px solid var(--bad);background:var(--bad-bg);border-radius:0 10px 10px 0;font-size:15px;color:var(--ink-2);line-height:1.8}.link{background:none;border:0;color:var(--ink-3);font-size:14px;cursor:pointer;padding:12px 4px;min-height:44px;text-decoration:underline;text-underline-offset:3px}.link:hover{color:var(--accent)}.no-select,.no-select *{user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.no-select input,.no-select textarea{user-select:text;-webkit-user-select:text}.passage{white-space:pre-line;margin:0 0 18px;padding:16px 20px;background:var(--pad);color:var(--pad-ink);border-left:3px solid var(--pad-margin);border-radius:0 10px 10px 0;font-size:19px;line-height:1.9}.passage p{margin:0}.passage p+p,.passage table+p,.passage p+table{margin-top:12px}.passage table{border-collapse:collapse;width:100%;font-size:17px;white-space:normal}.passage th,.passage td{border:1px solid var(--pad-rule);padding:6px 10px;text-align:left}.passage th{background:var(--pad-2);font-weight:600}.kids{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-top:8px}.kid{display:flex;flex-direction:column;align-items:center;gap:8px;min-height:132px;background:var(--shell);border:1px solid var(--hair);border-radius:var(--r);padding:20px 14px;cursor:pointer;transition:border-color .2s,background .2s}.kid:hover{border-color:var(--hair-2);background:var(--shell-2)}.kid .face{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;font-size:26px;background:var(--shell-2);border:1px solid var(--hair-2)}.kid b{font-family:var(--display);font-weight:600;font-size:17px}.kid i{font-style:normal;font-size:12.5px;color:var(--ink-3)}.pinrow{display:flex;gap:12px;justify-content:center;margin:26px 0 8px}.pindot{width:18px;height:18px;border-radius:50%;border:1px solid var(--hair-2);transition:background .18s,border-color .18s,transform .18s}.pindot.on{background:var(--accent);border-color:var(--accent);transform:scale(1.12)}.keys{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:24px}.key{min-height:64px;font-family:var(--mono);font-size:24px;font-variant-numeric:tabular-nums;background:var(--shell);border:1px solid var(--hair);border-radius:var(--r);color:var(--ink);cursor:pointer;transition:background .15s,border-color .15s}.key:hover{background:var(--shell-2);border-color:var(--hair-2)}.key:active{border-color:var(--accent)}.key.ghost{background:transparent;border-color:transparent;font-size:15px;font-family:var(--body)}.jump{display:flex;flex-wrap:wrap;gap:7px;margin:18px 0 4px}.jump button{min-width:44px;min-height:44px;border-radius:10px;border:1px solid var(--hair);background:var(--shell);color:var(--ink-2);font-family:var(--mono);font-size:14px;font-variant-numeric:tabular-nums;cursor:pointer;transition:border-color .18s,color .18s}.jump button:hover,.jump button.done{border-color:var(--hair-2);color:var(--ink)}.jump button.now{border-color:var(--accent);color:var(--accent)}.jump button.flag{background:var(--warn-bg);border-color:color-mix(in srgb,var(--warn) 30%,transparent)}.saved{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;color:var(--ink-3);font-variant-numeric:tabular-nums}.saved .dot{width:6px;height:6px;border-radius:50%;background:var(--ok);box-shadow:0 0 8px var(--ok)}.saved.pending .dot{background:var(--warn);box-shadow:0 0 8px var(--warn)}.saved.offline .dot{background:var(--ink-3);box-shadow:none}.center{display:grid;place-items:center;min-height:60vh;text-align:center;gap:14px}.skel{background:linear-gradient(90deg,var(--shell) 25%,var(--shell-2) 50%,var(--shell) 75%);background-size:200% 100%;animation:sh 1.4s linear infinite;border-radius:10px}@keyframes sh{to{background-position:-200% 0}}.sheet{position:fixed;inset:0;z-index:40;display:grid;place-items:center;padding:20px;background:color-mix(in srgb,var(--void) 82%,transparent);backdrop-filter:blur(10px);overflow-y:auto}.sheet-in{width:100%;max-width:460px;background:var(--shell);border:1px solid var(--hair);border-radius:var(--r);overflow:hidden;margin:auto}.sheet-head{display:flex;align-items:center;gap:14px;padding:16px 20px;border-bottom:1px solid var(--hair)}.sheet-head b{font-family:var(--display);font-weight:600;font-size:19px;display:block}.sheet-head i{font-style:normal;font-size:14px;color:var(--ink-3)}.sheet-head .quit{margin-left:auto}.sheet-body{padding:20px}.sheet-body .go{margin-top:8px}.avatars{display:flex;flex-wrap:wrap;gap:8px}.avatar{width:56px;height:56px;font-size:26px;line-height:1;background:var(--shell-2);border:1px solid var(--hair);border-radius:14px;cursor:pointer;transition:border-color .18s,transform .15s}.avatar:hover{border-color:var(--hair-2)}.avatar.is-on{border-color:var(--accent);transform:scale(1.06)}.rules{list-style:none;margin:8px 0 0;padding:0;font-size:13.5px;color:var(--ink-3);line-height:1.9}.rules li.ok{color:var(--ok)}.check{display:flex;align-items:flex-start;gap:12px;margin:6px 0 20px;cursor:pointer;font-size:15px;line-height:1.8}.check input{width:22px;height:22px;margin-top:4px;flex:none;accent-color:var(--accent)}.mini{border:1px solid var(--hair-2);background:transparent;color:var(--ink-2);border-radius:999px;padding:0 14px;min-height:44px;font-size:13.5px;cursor:pointer;white-space:nowrap;transition:border-color .2s,color .2s}.mini:hover{border-color:var(--accent);color:var(--accent)}.face-sm{font-size:22px;line-height:1;flex:none}:root[data-skin=book]{--paper: #fffcf3;--paper-2: #fdf6e4;--line: #eadfc7;--line-2: #d9cba9;--brand: #e0325a;--brand-soft: #fde3e9;--brand-band: #fff1f4;--thai: #e0325a;--thai-soft: #ffe6ec;--thai-band: #fff1f4;--math: #1f9d9a;--math-soft: #d9f4f2;--math-band: #eefaf9;--sci: #4fa63c;--sci-soft: #e2f4dc;--sci-band: #f1faee;--soc: #f08a24;--soc-soft: #ffe9d0;--soc-band: #fff5e8;--hist: #7b5ea7;--hist-soft: #ece4f6;--hist-band: #f7f3fb;--math1: #2f5fd0;--math1-soft: #d9e2fd;--math1-band: #eef2fe;--scien: #4338ca;--scien-soft: #dfdcfa;--scien-band: #eeecfd;--eng: #a32e9e;--eng-soft: #f6dff5;--eng-band: #fbf1fb;--logo: "Bai Jamjuree", "IBM Plex Sans Thai", system-ui, sans-serif;--void: var(--paper);--shell: #ffffff;--shell-2: var(--paper-2);--hair: var(--line);--hair-2: var(--line-2);--ink: #2b2418;--ink-2: #6b5f4c;--ink-3: #a2957f;--ink-ph: #8a7d68;--accent: var(--brand);--accent-2: #b3244a;--accent-glow: rgba(224, 50, 90, .16);--ok: #2e9a5b;--ok-bg: #dff5e6;--warn: #c98a12;--warn-bg: #fff2cc;--bad: #d64545;--bad-bg: #fde4e4;--r: 18px;--r-sm: 12px;--display: "Mitr", "IBM Plex Sans Thai", system-ui, sans-serif;color-scheme:light}:root[data-skin=book] body{background:var(--paper);font-size:17px;line-height:1.75}:root[data-skin=book] body:before{display:none}:root[data-skin=book] .wrap{max-width:900px;padding:0 20px 120px}:root[data-skin=book] .top{background:#fffcf3eb;backdrop-filter:blur(12px);border-bottom:2px solid var(--line)}:root[data-skin=book] .top-in{max-width:900px;padding:12px 20px;gap:12px}:root[data-skin=book] .mark{font-family:var(--logo)}:root[data-skin=book] .back{border:2px solid var(--line-2);background:#fff;border-radius:999px}:root[data-skin=book] .quit{border:2px solid var(--line-2);background:#fff;border-radius:999px}:root[data-skin=book] .rail{display:none}:root[data-skin=book] h1{font-family:var(--display);font-weight:500;font-size:30px;line-height:1.3;letter-spacing:0;margin:22px 0 4px}:root[data-skin=book] .sub{margin:0 0 18px;color:var(--ink-2)}:root[data-skin=book] .note{background:#fff;border:2px solid var(--line);border-radius:var(--r-sm)}:root[data-skin=book] .link{color:var(--ink-2)}:root[data-skin=book] .who{display:flex;align-items:center;gap:8px;background:#fff;border:2px solid var(--line);border-radius:999px;padding:4px 12px 4px 4px;font-weight:500;font-size:15px;white-space:nowrap}:root[data-skin=book] .who .av{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,#ffd166,#f08a24);display:grid;place-items:center;font-family:var(--display);font-size:13px;color:#fff}.ck-brand{--hue: var(--brand);--soft: var(--brand-soft);--band: var(--brand-band)}.ck-thai{--hue: var(--thai);--soft: var(--thai-soft);--band: var(--thai-band)}.ck-math{--hue: var(--math);--soft: var(--math-soft);--band: var(--math-band)}.ck-sci{--hue: var(--sci);--soft: var(--sci-soft);--band: var(--sci-band)}.ck-soc{--hue: var(--soc);--soft: var(--soc-soft);--band: var(--soc-band)}.ck-hist{--hue: var(--hist);--soft: var(--hist-soft);--band: var(--hist-band)}.ck-math1{--hue: var(--math1);--soft: var(--math1-soft);--band: var(--math1-band)}.ck-scien{--hue: var(--scien);--soft: var(--scien-soft);--band: var(--scien-band)}.ck-eng{--hue: var(--eng);--soft: var(--eng-soft);--band: var(--eng-band)}.bk-subjects{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:0 0 26px}@media(max-width:640px){.bk-subjects{grid-template-columns:repeat(2,1fr)}}.bk-subj{border:0;border-radius:var(--r);padding:14px 14px 12px;text-align:left;background:var(--soft);color:var(--ink);display:flex;flex-direction:column;gap:2px;position:relative;overflow:hidden;box-shadow:inset 0 0 0 2px transparent;transition:transform .12s;min-height:44px}.bk-subj:active{transform:scale(.98)}.bk-subj[aria-current=true]{box-shadow:inset 0 0 0 3px var(--hue)}.bk-subj .nm{font-family:var(--display);font-weight:500;font-size:19px;color:var(--hue)}.bk-subj .ct{font-size:14px;color:var(--ink-2)}.bk-bar{height:6px;border-radius:3px;background:#fff;margin-top:8px;overflow:hidden}.bk-bar i{display:block;height:100%;background:var(--hue);border-radius:3px}.bk-whole{display:flex;align-items:center;gap:16px;flex-wrap:wrap;background:#fff;border:2px solid var(--line);border-radius:var(--r);padding:16px 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160px;height:7px;border-radius:4px;background:var(--paper-2);margin-top:0}.bk-modes{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}.bk-pill{border:0;background:var(--hue);color:#fff;border-radius:999px;padding:8px 18px;font-weight:600;font-size:16px;box-shadow:0 3px #00000024;min-height:44px}.bk-pill.ghost{background:var(--soft);color:var(--hue);box-shadow:none}.bk-pill.small{min-height:36px;padding:4px 14px;font-size:14px;font-weight:500}.bk-pill:disabled{opacity:.55;cursor:wait}.bk-band{display:flex;align-items:center;gap:12px;background:var(--band);border-radius:12px;padding:8px 14px;margin:26px 0 12px}.bk-band h3{margin:0;font-family:var(--display);font-weight:500;font-size:18px;color:var(--ink)}.bk-band .n{margin-left:auto;font-size:14px;color:var(--ink-2);white-space:nowrap}.bk-units{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}.bk-unit{display:grid;grid-template-columns:78px 1fr;background:#fff;border:2px solid var(--line);border-radius:var(--r);overflow:hidden;text-align:left;padding:0;position:relative;transition:transform .12s,box-shadow .12s;color:var(--ink);min-height:44px}.bk-unit:hover:not(:disabled){box-shadow:0 6px 18px #503c141a;transform:translateY(-1px)}.bk-unit:active:not(:disabled){transform:scale(.985)}.bk-unit[aria-current=true]{border-color:var(--hue);box-shadow:0 0 0 2px var(--hue)}.bk-unit:disabled{cursor:not-allowed;opacity:.6}.bk-unit .tab{background:var(--hue);color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:10px 6px;gap:0;font-family:var(--display)}.bk-unit .tab small{font-size:11px;opacity:.9;letter-spacing:.02em;line-height:1.2;text-align:center}.bk-unit .tab b{font-size:30px;font-weight:600;line-height:1.05}.bk-unit .tab b.txt{font-size:17px;line-height:1.2;text-align:center}.bk-unit .body{padding:12px 14px;min-width:0}.bk-unit .ttl{display:block;font-family:var(--display);font-weight:500;font-size:17px;line-height:1.35;color:var(--ink);text-wrap:balance}.bk-unit .meta{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--ink-2);margin-top:6px;flex-wrap:wrap}.bk-unit .meta .bk-bar{flex:1 1 60px;height:7px;border-radius:4px;background:var(--paper-2);margin-top:0;min-width:50px}.bk-unit .bk-score{font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}.bk-chip{display:inline-block;font-size:12px;font-weight:600;padding:1px 9px;border-radius:999px;background:var(--ok-bg);color:var(--ok);line-height:1.7}.bk-chip.new{background:var(--warn-bg);color:var(--warn)}.bk-chip.thin{background:var(--bad-bg);color:var(--bad)}.bk-result{background:#fff;border:2px solid var(--line);border-radius:24px;overflow:hidden;margin-top:18px}.bk-result .hero{background:linear-gradient(135deg,var(--soft),#fff4c2 70%,#fff);padding:26px 22px 20px;display:grid;grid-template-columns:auto 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p.facts{font-size:17px;font-weight:600;color:var(--ink)}@media(max-width:860px){.bk-result .hero h1.slang{font-size:24px}}.bk-bd{padding:6px 22px 20px}.bk-bd h3{font-family:var(--display);font-weight:500;font-size:18px;margin:16px 0 8px}.bk-row{display:grid;grid-template-columns:1fr auto;align-items:center;gap:12px;padding:10px 0;border-top:1px solid var(--line)}.bk-row:first-of-type{border-top:0}.bk-row .nm{display:flex;align-items:center;gap:10px;min-width:0}.bk-row .dot{width:12px;height:12px;border-radius:4px;background:var(--hue);flex:none}.bk-row .rt{display:flex;gap:10px;align-items:center}.bk-row .bk-bar{width:130px;height:9px;border-radius:5px;background:var(--paper-2);margin-top:0}.bk-row .num{font-weight:600;font-variant-numeric:tabular-nums;width:48px;text-align:right}.bk-miss{display:grid;gap:8px;margin:0;padding:0}.bk-miss li{list-style:none;display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:start;background:var(--paper-2);border-radius:var(--r-sm);padding:10px 12px}.bk-miss .q{font-weight:600;color:var(--bad);font-variant-numeric:tabular-nums;white-space:nowrap}.bk-miss .g{font-size:12.5px;color:var(--ink-2)}.bk-miss .re{border:0;background:transparent;padding:0;font-size:13px;color:var(--brand);font-weight:600;white-space:nowrap;min-height:44px}.bk-acts{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.bk-acts .bk-pill{flex:1 1 160px;padding:12px 18px;font-size:17px;text-align:center}:root[data-skin=book] .fb{border:2px solid var(--line);background:#fff}:root[data-skin=book] .fb-body{color:var(--ink)}:root[data-skin=book] .ch{background:#fff;border-color:var(--line)}:root[data-skin=book] .ch.right{background:var(--ok-bg);border-color:var(--ok)}:root[data-skin=book] .ch.chosen-wrong{background:var(--bad-bg);border-color:var(--bad)}:root[data-skin=book] .ch.right .k,:root[data-skin=book] .ch.chosen-wrong .k{color:#fff}:root[data-skin=book] .passage{background:var(--paper-2)}.exp{--x-line: #eadfc7;--x-line-2: #d9cba9;--x-paper-2: #fdf6e4;--x-ink: #2b2418;--x-ink-2: #6b5f4c;--x-ink-3: #a2957f;--x-ok: #2e9a5b;--x-ok-bg: #dff5e6;--x-warn: #c98a12;--x-warn-bg: #fff2cc;--x-display: "Mitr", "IBM Plex Sans Thai", system-ui, sans-serif;position:relative;margin-top:22px;background:#fff;color:var(--x-ink);border:2px solid var(--x-line);border-radius:20px;overflow:hidden;box-shadow:0 8px 24px #3c280a0f}.exp .head{display:flex;align-items:center;gap:12px;padding:12px 18px;background:var(--x-warn-bg);border-bottom:2px solid #f3e2b0;font-size:inherit}.exp.ok .head{background:var(--x-ok-bg);border-bottom-color:#bfe5cc}.exp .head .ic{width:38px;height:38px;border-radius:50%;background:#fff;display:grid;place-items:center;flex:none;box-shadow:0 2px #00000014}.exp .head .ic svg{width:22px;height:22px}.exp .head b{font-family:var(--x-display);font-weight:500;font-size:19px;color:var(--x-warn)}.exp.ok .head b{color:var(--x-ok)}.exp .body{padding:16px 20px 18px;display:grid;gap:14px}.exp .ans{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:16px;color:var(--x-ink-2)}.exp .ans b{font-family:var(--x-display);font-weight:500;font-size:18px;color:#1f6b3f;background:var(--x-ok-bg);border-radius:999px;padding:3px 14px}.exp .fb-body{padding:0;border:0;background:transparent;color:var(--x-ink);font-size:19px;line-height:1.9}.exp p{margin:0;font-size:19px;line-height:1.9;color:var(--x-ink);white-space:pre-line}.exp p mark{background:linear-gradient(transparent 55%,var(--soft, #fde3e9) 55%);color:inherit;padding:0 2px;font-weight:600}.exp .tip{display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:start;background:var(--x-paper-2);border-radius:14px;padding:10px 14px;font-size:16.5px;line-height:1.7;color:var(--x-ink)}.exp .tip .t{font-family:var(--x-display);font-weight:500;color:var(--hue, #e0325a);white-space:nowrap}.exp .src{display:flex;align-items:center;gap:8px;font-size:14px;line-height:1.6;color:var(--x-ink-3);border-top:1px dashed var(--x-line-2);padding-top:12px;margin:0}.exp .src svg{width:18px;height:18px;fill:none;stroke:var(--x-ink-3);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}.exp .src b{color:var(--x-ink-2);font-weight:500}.exp .work{border-top:1px solid var(--x-line);background:var(--x-paper-2)}.exp .work h3{color:var(--x-ink-3)}.review .qcard{border:1px solid var(--hair);border-radius:var(--r);background:var(--shell);overflow:hidden}.review .qcard-top{padding:12px 20px;font-family:var(--display);font-weight:500;font-size:15px;color:var(--ink-3);border-bottom:1px solid var(--hair)}.review .qcard-body{padding:18px 20px;font-size:17px;line-height:1.9;color:var(--ink)}.review .exp{margin-top:10px}.figure{margin:0 0 14px;padding:12px;border:1px solid var(--line, rgba(128, 128, 128, .3));border-radius:14px;background:var(--paper-2, transparent)}.figure svg{display:block;width:100%;height:auto;max-width:560px;margin:0 auto;min-height:60px}.math{display:inline-block;vertical-align:baseline}.math .katex{font-size:1.05em;line-height:1.2}.math .katex-display,.math>.katex{max-width:100%;overflow-x:auto;overflow-y:hidden}