/* Noandishan v19 — discovery notebook + real-time snake & ladder duel */
:root{
  --v19-ink:#17243a;--v19-muted:#627189;--v19-line:#dfe7f1;--v19-blue:#3157d5;
  --v19-teal:#0f9f82;--v19-amber:#ef9b28;--v19-purple:#7357d7;--v19-red:#d94b6b;
  --v19-navy:#102d5b;--v19-paper:#fffdf7;--v19-shadow:0 22px 62px rgba(25,48,84,.12)
}
.v19-four{grid-template-columns:repeat(4,minmax(0,1fr))!important}.v16-module.duel{background:linear-gradient(145deg,#effff6,#e9f8ff)!important;border-color:#bdebd8!important}.v16-module.duel i{background:#0f9f82!important;color:#fff!important}
.v19-tabbar{grid-template-columns:repeat(4,minmax(0,1fr))!important}.v19-tabbar button:nth-child(3).active,.v19-bottom-nav button:nth-child(3).active{color:#087d65!important}.v19-bottom-nav{grid-template-columns:repeat(4,1fr)!important}

/* learning header, mode and personal notebook */
.v19-learning-head{background:radial-gradient(circle at 8% 18%,rgba(255,214,102,.28),transparent 22rem),linear-gradient(135deg,#112e5d,#234f87 58%,#0f806e)!important;color:#fff!important;border:0!important;box-shadow:0 24px 70px rgba(16,45,91,.24)!important;align-items:center!important}.v19-learning-head>div:first-child span,.v19-learning-head>div:first-child p{color:#dbe8fb!important}.v19-learning-head h1{color:#fff!important}.v19-learning-tools{display:grid;justify-items:end;gap:10px;min-width:310px}.v19-mode-switch{display:flex;gap:5px;background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.2);padding:5px;border-radius:16px;backdrop-filter:blur(12px)}.v19-mode-switch button{box-shadow:none;background:transparent;color:#e5effc;border:0;padding:9px 13px;border-radius:12px}.v19-mode-switch button.active{background:#fff;color:#173f75}.v19-notebook-btn{background:linear-gradient(135deg,#ffce58,#f09a28)!important;color:#322208!important;border:0!important;box-shadow:0 12px 30px rgba(239,155,40,.28)!important}.v19-learning-tools .v18-total-progress{border-color:rgba(255,255,255,.25)!important;background:rgba(255,255,255,.14)!important;color:#fff!important}.v19-learning-tools .v18-total-progress span{color:#e7f0fb!important}

/* slide deck */
.v19-slide-shell{max-width:1180px;margin:0 auto}.v19-slide-progress{display:flex;align-items:center;justify-content:space-between;gap:18px;margin:17px 0 13px;padding:12px 16px;border:1px solid var(--v19-line);border-radius:17px;background:#fff;box-shadow:0 8px 26px rgba(25,48,84,.05)}.v19-slide-progress>span{font-size:13px;font-weight:900;color:var(--v19-blue);white-space:nowrap}.v19-slide-progress>div{display:flex;gap:7px;flex:1}.v19-slide-progress i{display:block;height:7px;flex:1;border-radius:99px;background:#e7edf5}.v19-slide-progress i.active{background:var(--lesson,#3157d5);box-shadow:0 0 0 4px color-mix(in srgb,var(--lesson,#3157d5) 12%,transparent)}.v19-slide-progress i.done{background:#1f9d72}
.v19-learning-slide{border:1px solid var(--v19-line);border-radius:30px;background:#fff;box-shadow:var(--v19-shadow);overflow:hidden}.v19-learning-slide>header{padding:34px clamp(22px,4vw,48px) 28px;background:radial-gradient(circle at 92% 0,color-mix(in srgb,var(--lesson) 22%,transparent),transparent 20rem),linear-gradient(135deg,color-mix(in srgb,var(--lesson) 10%,white),#fff);border-bottom:1px solid #e8eef5}.v19-learning-slide>header>span{display:inline-flex;padding:7px 11px;border-radius:999px;background:color-mix(in srgb,var(--lesson) 12%,white);color:var(--lesson);font-size:12px;font-weight:950}.v19-learning-slide>header h1{margin:11px 0 8px;font-size:clamp(26px,4vw,43px);line-height:1.5}.v19-learning-slide>header p{max-width:900px;margin:0;color:#52637a;line-height:2;font-size:15px}.v19-slide-body{padding:26px clamp(20px,4vw,45px)}
.v19-slide-body .v18-demo,.v19-slide-body .v18-key-grid,.v19-slide-body .v18-examples{margin-left:0!important;margin-right:0!important}.v19-slide-body .v18-demo{box-shadow:inset 0 0 0 1px #e3eaf3,0 12px 35px rgba(29,52,86,.07);background:linear-gradient(145deg,#fbfdff,#f4fbf8)}
.v19-reflection{margin:0 clamp(20px,4vw,45px) 34px;padding:22px;border-radius:23px;background:linear-gradient(145deg,#fffaf0,#fffdf9);border:1px solid #f3dcae;box-shadow:0 12px 32px rgba(152,105,27,.08)}.v19-reflection-head{display:flex;justify-content:space-between;align-items:center;gap:14px}.v19-reflection-head span{color:#a45d04;font-weight:950}.v19-reflection-head h3{margin:4px 0 0;font-size:19px}.v19-reflection-head small{background:#fff1c8;color:#8a5209;border:1px solid #f0d28d;border-radius:999px;padding:7px 10px;font-weight:900}.v19-reflection>p{color:#6d604a;line-height:1.9;font-size:13px}.v19-reflection textarea{min-height:126px;background:#fff;border:2px solid #ead7aa;border-radius:18px;padding:15px;line-height:2;font-size:15px;resize:vertical}.v19-reflection textarea:focus{border-color:#ef9b28;box-shadow:0 0 0 4px rgba(239,155,40,.12)}.v19-reflection-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:12px}.v19-reflection-actions small{color:#8b7656}.v19-reflection-actions button{background:#a86208;box-shadow:none}
.v19-slide-nav{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;margin:16px 0 25px}.v19-slide-nav>div{text-align:center;color:#64758c;font-size:12px}.v19-slide-nav>button:last-child{background:linear-gradient(135deg,#3157d5,#0f9f82);min-width:190px}.v19-slide-nav button:disabled{opacity:.38}

/* self-written notebook */
.v19-notebook{max-width:1180px;margin:18px auto;background:linear-gradient(90deg,#efe5cb 0 16px,var(--v19-paper) 16px);border:1px solid #ded2b8;border-radius:30px;box-shadow:0 24px 70px rgba(62,47,18,.14);overflow:hidden}.v19-notebook-cover{padding:30px 36px 26px 48px;display:flex;justify-content:space-between;align-items:center;gap:20px;background:radial-gradient(circle at 86% 10%,rgba(255,222,120,.34),transparent 18rem),linear-gradient(135deg,#14345f,#245482);color:#fff}.v19-notebook-cover span{color:#ffd267;font-weight:950}.v19-notebook-cover h1{font-size:clamp(28px,4vw,43px);margin:7px 0}.v19-notebook-cover p{margin:0;color:#dbe8f7}.v19-notebook-tabs{display:flex;gap:8px;padding:16px 30px;border-bottom:1px dashed #d9cdaE;background:#fffaf0;overflow-x:auto}.v19-notebook-tabs button{white-space:nowrap;background:#fff;color:#5e5037;border:1px solid #dfd0af;box-shadow:none}.v19-notebook-tabs button.active{background:#173f75;color:#fff;border-color:#173f75}.v19-notebook-pages{padding:24px 34px 38px 48px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;background-image:linear-gradient(#dfebf3 1px,transparent 1px);background-size:100% 34px;background-position:0 25px}.v19-notebook-pages article{position:relative;background:rgba(255,253,247,.93);border:1px solid #dfd3ba;border-radius:20px;padding:17px;min-height:180px;box-shadow:0 10px 25px rgba(77,58,23,.07)}.v19-notebook-pages article:before{content:"";position:absolute;right:-6px;top:25px;width:12px;height:12px;border-radius:50%;background:#d0c1a1}.v19-notebook-pages header{display:flex;gap:11px;align-items:center;border-bottom:1px dashed #dbcfae;padding-bottom:10px}.v19-notebook-pages header>span{width:34px;height:34px;border-radius:12px;background:#ef9b28;color:#fff;display:grid;place-items:center;font-weight:950}.v19-notebook-pages header b,.v19-notebook-pages header small{display:block}.v19-notebook-pages header small{color:#887a61;margin-top:3px}.v19-notebook-pages p{line-height:2.15;color:#34445a;margin:14px 0;font-size:14px}.v19-notebook-pages footer{color:#907f62;font-size:11px}

/* duel entrance / lock / queue */
.v19-duel-ready,.v19-duel-lock,.v19-duel-wait,.v19-duel-result{max-width:980px;margin:22px auto;padding:clamp(24px,5vw,48px);text-align:center;border:1px solid var(--v19-line);border-radius:32px;background:#fff;box-shadow:var(--v19-shadow)}.v19-duel-ready{background:radial-gradient(circle at 15% 12%,rgba(67,214,153,.2),transparent 18rem),radial-gradient(circle at 88% 5%,rgba(255,198,75,.24),transparent 19rem),#fff}.v19-ready-art{font-size:68px;display:flex;justify-content:center;align-items:center;gap:20px}.v19-ready-art span{font-size:20px;background:#17243a;color:#fff;padding:10px 14px;border-radius:14px}.v19-duel-ready>span,.v19-duel-lock>span,.v19-duel-wait>span,.v19-duel-result>span{display:block;color:#0f9f82;font-weight:950;margin-top:14px}.v19-duel-ready h1,.v19-duel-lock h1,.v19-duel-wait h1,.v19-duel-result h1{font-size:clamp(27px,4vw,43px);margin:8px 0}.v19-duel-ready>p,.v19-duel-lock>p,.v19-duel-wait>p{color:#5b6d84;line-height:2;max-width:760px;margin:0 auto 20px}.v19-duel-rules{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:20px 0}.v19-duel-rules>div{background:rgba(255,255,255,.82);border:1px solid #dfe9ee;border-radius:18px;padding:14px}.v19-duel-rules b,.v19-duel-rules span{display:block}.v19-duel-rules b{font-size:25px;color:#0b7e68}.v19-duel-rules span{font-size:12px;color:#68788d}.v19-find-opponent{padding:15px 28px;background:linear-gradient(135deg,#0f9f82,#3157d5);font-size:16px}
.v19-speed-tiers{background:#f6f9fd;border:1px solid #dfe7f1;border-radius:20px;padding:15px;text-align:right}.v19-speed-tiers>b{display:block;margin-bottom:10px}.v19-speed-tiers>div{display:flex;gap:7px;flex-wrap:wrap}.v19-speed-tiers>div span{display:flex;align-items:center;gap:5px;border:1px solid #dce5f0;border-radius:999px;background:#fff;padding:6px 9px;color:#50627a;font-size:11px}.v19-speed-tiers i{width:25px;height:25px;border-radius:50%;display:grid;place-items:center;background:#ef9b28;color:#fff;font-style:normal;font-weight:950}.v19-speed-tiers small{display:block;color:#728198;margin-top:9px;line-height:1.8}.v19-lock-icon{width:86px;height:86px;margin:auto;border-radius:28px;background:#fff2df;display:grid;place-items:center;font-size:40px}.v19-gate-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;text-align:right;margin:20px 0}.v19-gate-list article{display:flex;align-items:center;gap:11px;border:1px solid #e3e9f1;border-radius:17px;padding:12px;background:#fafbfd}.v19-gate-list article>b{width:34px;height:34px;border-radius:12px;background:#e7edf5;color:#6a798d;display:grid;place-items:center}.v19-gate-list article.ok{background:#effcf7;border-color:#bce8d8}.v19-gate-list article.ok>b{background:#0f9f82;color:#fff}.v19-gate-list strong,.v19-gate-list span{display:block}.v19-gate-list span{font-size:11px;color:#748399;margin-top:3px}.v19-radar{position:relative;width:170px;height:170px;margin:0 auto;border-radius:50%;background:radial-gradient(circle,#0f9f82 0 8px,transparent 9px 30%,rgba(15,159,130,.17) 31% 32%,transparent 33% 61%,rgba(15,159,130,.12) 62% 63%,transparent 64%);overflow:hidden}.v19-radar:after{content:"";position:absolute;inset:50% 50% 0 0;background:conic-gradient(from 0deg,rgba(15,159,130,.55),transparent 80%);transform-origin:0 0;animation:v19radar 2s linear infinite}.v19-radar span{position:absolute;inset:0;display:grid;place-items:center;font-weight:950;font-size:23px;color:#173f75;z-index:2}.v19-radar i{position:absolute;width:12px;height:12px;border-radius:50%;background:#ef9b28;z-index:3}.v19-radar i:nth-child(1){top:32px;right:50px}.v19-radar i:nth-child(2){bottom:37px;left:37px}.v19-radar i:nth-child(3){bottom:26px;right:64px}@keyframes v19radar{to{transform:rotate(360deg)}}.v19-wait-info{display:grid;gap:4px;background:#f5f8fc;border-radius:18px;padding:14px;margin:18px auto;max-width:520px}.v19-wait-info span{color:#718096;font-size:12px}

/* live duel */
.v19-duel{max-width:1440px;margin:0 auto;padding:16px 18px 120px}.v19-duel-head{display:flex;align-items:center;justify-content:space-between;gap:22px;padding:24px 27px;border-radius:28px;background:radial-gradient(circle at 9% 10%,rgba(255,209,91,.28),transparent 18rem),linear-gradient(135deg,#102d5b,#194f78 62%,#0b7f6a);color:#fff;box-shadow:0 22px 55px rgba(16,45,91,.24)}.v19-duel-head>div:first-child>span{color:#ffd267;font-weight:950}.v19-duel-head h1{margin:7px 0;font-size:clamp(25px,3.5vw,39px)}.v19-duel-head p{margin:0;color:#dce8f5;line-height:1.9}.v19-duel-timer{min-width:160px;text-align:center;border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.12);border-radius:22px;padding:13px 18px;backdrop-filter:blur(12px)}.v19-duel-timer small,.v19-duel-timer b{display:block}.v19-duel-timer small{color:#dce8f5}.v19-duel-timer b{font-size:30px;letter-spacing:1px;margin-top:2px}
.v19-duel-scoreboard{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0}.v19-duel-scoreboard article{border:1px solid var(--v19-line);border-radius:22px;background:#fff;padding:15px;box-shadow:0 10px 30px rgba(26,51,88,.06)}.v19-duel-scoreboard article.self{border-color:#7bd0ba;background:linear-gradient(145deg,#effcf7,#fff)}.v19-duel-scoreboard header{display:flex;align-items:center;gap:10px}.v19-duel-scoreboard header>span{width:42px;height:42px;border-radius:15px;background:#3157d5;color:#fff;display:grid;place-items:center;font-weight:950}.v19-duel-scoreboard article.self header>span{background:#0f9f82}.v19-duel-scoreboard header b,.v19-duel-scoreboard header small{display:block}.v19-duel-scoreboard header small{color:#738299;font-size:11px}.v19-duel-scoreboard article>div:nth-of-type(1){display:flex;justify-content:space-between;gap:10px;margin:13px 0 8px}.v19-duel-scoreboard article>div span{color:#64758c;font-size:12px}.v19-player-bar{height:10px;background:#e8edf4;border-radius:99px;overflow:hidden}.v19-player-bar i{display:block;height:100%;background:linear-gradient(90deg,#3157d5,#0f9f82);border-radius:99px}.v19-duel-scoreboard footer{display:flex;justify-content:space-between;gap:10px;margin-top:8px;font-size:11px;color:#66768c}
.v19-duel-layout{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(360px,.88fr);gap:15px;align-items:start}.v19-board-wrap{border:1px solid var(--v19-line);background:linear-gradient(145deg,#f7fafc,#fff);border-radius:27px;padding:14px;box-shadow:0 14px 40px rgba(25,48,84,.08)}.v19-board{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));aspect-ratio:1/1;border:6px solid #173f75;border-radius:18px;overflow:hidden;background:#fff;box-shadow:inset 0 0 0 1px #fff}.v19-cell{position:relative;min-width:0;border:1px solid rgba(23,63,117,.12);background:#f8fbff;overflow:hidden}.v19-cell:nth-child(4n+1){background:#fff5dc}.v19-cell:nth-child(4n+2){background:#eaf8f3}.v19-cell:nth-child(4n+3){background:#eef3ff}.v19-cell>span{position:absolute;top:3px;left:4px;font-size:10px;font-weight:950;color:#50627b}.v19-cell>b{position:absolute;inset:13% 4px auto;display:grid;place-items:center;font-size:clamp(14px,2.2vw,28px);line-height:1;text-align:center}.v19-cell>b small{display:block;font-size:7px;color:#33465e;background:rgba(255,255,255,.72);padding:2px 3px;border-radius:5px}.v19-cell.snake{box-shadow:inset 0 0 0 3px rgba(217,75,107,.32)}.v19-cell.ladder{box-shadow:inset 0 0 0 3px rgba(15,159,130,.34)}.v19-tokens{position:absolute;right:3px;bottom:3px;display:flex;gap:2px;z-index:3}.v19-tokens i{width:clamp(17px,2.3vw,29px);height:clamp(17px,2.3vw,29px);border-radius:50%;display:grid;place-items:center;background:#7357d7;color:#fff;font-style:normal;font-size:8px;font-weight:950;border:2px solid #fff;box-shadow:0 4px 10px rgba(0,0,0,.22)}.v19-tokens i.self{background:#0f9f82;transform:scale(1.08)}.v19-board-legend{display:flex;gap:12px;flex-wrap:wrap;margin-top:11px;color:#64758b;font-size:11px}.v19-board-legend span{display:flex;align-items:center;gap:5px}.v19-board-legend i{width:15px;height:15px;border-radius:5px;background:#eee}.v19-board-legend i.snake{background:#f5b6c4}.v19-board-legend i.ladder{background:#9edfcf}.v19-board-legend i.self{background:#0f9f82;border-radius:50%}
.v19-duel-question{position:sticky;top:88px;border:1px solid var(--v19-line);background:#fff;border-radius:27px;padding:18px;box-shadow:0 18px 50px rgba(25,48,84,.1)}.v19-q-badge{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:17px 0 8px}.v19-q-badge span{display:inline-flex;padding:7px 10px;border-radius:999px;background:#edf3ff;color:#3157d5;font-size:11px;font-weight:950}.v19-q-badge b{color:#738198;font-size:12px}.v19-duel-question h2{font-size:clamp(19px,2.5vw,27px);line-height:1.9;margin:10px 0 16px}.v19-duel-options{display:grid;grid-template-columns:1fr 1fr;gap:9px}.v19-duel-options.two{grid-template-columns:1fr 1fr}.v19-duel-options button{display:flex;align-items:center;gap:9px;text-align:right;background:#f9fbfd;color:#26374e;border:2px solid #e2e8f1;box-shadow:none;min-height:57px}.v19-duel-options button>span{width:29px;height:29px;min-width:29px;border-radius:10px;background:#e7eef8;color:#3157d5;display:grid;place-items:center}.v19-duel-options button.selected{border-color:#0f9f82;background:#effcf7}.v19-duel-options button.selected>span{background:#0f9f82;color:#fff}.v19-duel-input{display:grid;gap:7px;color:#506078;font-weight:900}.v19-duel-input input{font-size:21px;text-align:center;direction:ltr}.v19-duel-note{padding:9px 11px;border-radius:12px;background:#fff5df;color:#8a590c;font-size:11px;margin-bottom:8px}.v19-order-pool{display:flex;gap:7px;flex-wrap:wrap}.v19-order-pool button{background:#f2f6fb;color:#32465f;box-shadow:none;border:1px solid #dce5ef}.v19-order-result{min-height:56px;display:flex;gap:7px;flex-wrap:wrap;align-items:center;background:#f8fafc;border:1px dashed #bdc9d8;border-radius:15px;padding:10px;margin:9px 0;color:#627189}.v19-order-result span{background:#fff;border:1px solid #dce5ef;border-radius:10px;padding:6px 8px}.v19-submit-answer{width:100%;margin-top:14px;padding:14px;background:linear-gradient(135deg,#0f9f82,#3157d5);font-size:15px}.v19-duel-reminder{color:#718198;font-size:11px;text-align:center;margin-top:9px}.v19-duel-feedback{margin-top:12px;border-radius:16px;padding:12px;display:grid;gap:4px}.v19-duel-feedback.ok{background:#ecfbf5;border:1px solid #aee6d5;color:#08795f}.v19-duel-feedback.bad{background:#fff1f4;border:1px solid #f3bdc9;color:#ad304e}.v19-duel-feedback small{opacity:.78}

/* result and final exam gate */
.v19-duel-result.win{background:radial-gradient(circle at 50% 0,rgba(255,209,91,.35),transparent 20rem),#fff}.v19-result-cup{font-size:70px}.v19-result-reason{display:grid;gap:4px;max-width:650px;margin:15px auto;background:#f6f8fb;border-radius:17px;padding:13px}.v19-result-reason span{color:#68778d;font-size:12px}.v19-result-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:18px}.v19-exam-lock{max-width:760px;margin:32px auto;text-align:center;padding:40px;border:1px solid #e1e8f1;border-radius:29px;background:radial-gradient(circle at 50% 0,rgba(115,87,215,.12),transparent 18rem),#fff;box-shadow:var(--v19-shadow)}.v19-exam-lock>span{font-size:58px}.v19-exam-lock h2{font-size:29px;margin:9px}.v19-exam-lock p{color:#617188;line-height:2}.v19-exam-lock button{background:#7357d7}

/* teacher duel status */
.v10-part-switch.duel{border-color:#b9ead9;background:#f1fcf8}.v10-part-switch.duel>span{color:#0f9f82}.v19-teacher-duels{display:grid;gap:12px;margin-top:15px}.v19-teacher-duel-card{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;border:1px solid #dde7ef;border-radius:18px;padding:14px;background:#fff}.v19-teacher-duel-card.active{border-color:#8fd7c3;background:#f1fcf8}.v19-teacher-duel-card h4{margin:0 0 4px}.v19-teacher-duel-card p{margin:0;color:#6d7d91;font-size:12px}.v19-teacher-duel-card>span{border-radius:999px;padding:7px 10px;background:#eef2f7;color:#5c6c80;font-size:11px;font-weight:900}.v19-teacher-duel-card.active>span{background:#d9f5eb;color:#087b61}

@media(max-width:1050px){.v19-duel-layout{grid-template-columns:1fr}.v19-duel-question{position:static}.v19-board-wrap{max-width:720px;margin:auto}.v19-learning-head{align-items:flex-start!important}.v19-learning-tools{min-width:250px}.v19-notebook-pages{grid-template-columns:1fr}.v19-four{grid-template-columns:1fr 1fr!important}}
@media(max-width:720px){
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