@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@600;700;800&family=Be+Vietnam+Pro:wght@400;500;600;700;800&display=swap');
:root{--paper:#FFF6DC;--ink:#3A1D0A;--green:#0B6E6E;--muted:#6B4A2B;--line:#E3C98A;--gold:#FFC93C;--orange:#C62828;--red:#C62828;--white:#FFFFFF;font-family:'Be Vietnam Pro',system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--gold);outline-offset:4px}.skip{position:fixed;top:-100px;left:20px;z-index:30;background:var(--green);color:white;padding:12px}.skip:focus{top:10px}.header{height:104px;max-width:1320px;margin:auto;padding:0 48px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:17px;letter-spacing:.06em;font-weight:500;white-space:nowrap}.brand b{font-weight:800}.brand small{display:block;letter-spacing:0;font-size:10px;margin-top:6px;color:var(--muted);font-weight:400}.brand-icon{background:var(--green);color:var(--paper);width:43px;height:48px;display:grid;place-items:center;border-radius:4px 4px 17px 4px;font-family:'Baloo 2',sans-serif;font-size:29px}nav{display:flex;gap:25px}nav button{border:0;background:none;color:var(--muted);padding:12px 0;font-size:12px}nav button.active{color:var(--green);box-shadow:0 2px var(--green);font-weight:600}.teacher-button{border:1px solid var(--line);background:transparent;border-radius:7px;padding:12px 14px;font-size:11px}.teacher-button span{margin-left:12px}main{max-width:1224px;margin:auto;min-height:calc(100vh - 190px);padding:42px 0 60px}.hero{position:relative;overflow:hidden;border-radius:16px;background:var(--green);color:var(--paper);display:grid;grid-template-columns:1.15fr 1fr;min-height:345px}.hero-copy{padding:46px 0 42px 48px;z-index:1}.eyebrow{font-size:10px;letter-spacing:.17em;font-weight:600;display:flex;align-items:center;gap:9px;text-transform:uppercase}.eyebrow:before{content:'';display:block;width:24px;height:1px;background:currentColor}.hero .eyebrow{color:#e3c484}h1,h2,h3,p{margin-top:0}.hero h1{font-family:'Baloo 2',sans-serif;font-size:49px;line-height:1.22;letter-spacing:-.03em;font-weight:400;margin:20px 0 17px}.hero h1 em{font-style:normal;color:#e6bd71}.hero p{font-size:12px;line-height:1.9;color:#c1d0c3;max-width:365px}.hero-tag{display:inline-flex;align-items:center;border:1px solid #66877a;padding:8px 11px;border-radius:4px;font-size:9px;letter-spacing:.05em;margin-top:8px}.hero-art{width:100%;height:100%;min-height:320px;position:relative;isolation:isolate}.hero-art svg{position:absolute;width:100%;height:100%;right:0;top:0}.hero-art:before{content:'';position:absolute;width:330px;height:330px;left:24%;top:20px;border:1px solid #54796a;border-radius:50%;opacity:.5}.section-head{display:flex;justify-content:space-between;align-items:end;margin-top:38px;margin-bottom:20px;gap:15px}.section-head h2{font-family:'Baloo 2',sans-serif;font-weight:500;font-size:25px;margin-bottom:8px}.section-head p,.muted{color:var(--muted);font-size:12px;line-height:1.8;margin-bottom:0}.tiny{font-size:10px;color:var(--muted)}.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.grade{position:relative;text-align:left;padding:20px;border:1px solid var(--line);border-radius:10px;background:var(--white);color:var(--ink);min-height:126px;transition:transform .2s,border-color .2s}.grade:hover{transform:translateY(-3px);border-color:var(--green)}.grade.active{border:2px solid var(--green);padding:19px;background:#edf1e8}.grade-top{display:flex;justify-content:space-between;align-items:center}.grade-number{font-family:'Baloo 2',sans-serif;font-size:32px}.grade small{font-size:10px;color:var(--muted)}.grade .arrow{font-size:20px;font-weight:400;color:#759184}.grade p{font-size:11px;margin:12px 0 0}.workspace{display:grid;grid-template-columns:1fr 276px;gap:24px;margin-top:30px}.content-panel,.side-panel{border:1px solid var(--line);background:var(--white);border-radius:12px;padding:24px}.filter-line{display:flex;gap:14px;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:18px}.filter-line h2{font-size:16px;margin:0}.filter-line select{max-width:230px;background:var(--paper);border:1px solid var(--line);padding:9px;border-radius:5px;font-size:11px}.empty{padding:36px 20px;text-align:center;max-width:500px;margin:auto}.empty-icon{display:grid;place-items:center;margin:0 auto 18px;width:60px;height:60px;border:1px solid var(--line);background:var(--paper);border-radius:50%;font-size:24px;color:var(--green)}.empty h3{font-size:16px;font-weight:600;margin-bottom:10px}.empty p{font-size:12px;color:var(--muted);line-height:1.9}.primary,.secondary,.text-button{border:0;border-radius:6px;padding:12px 18px;font-size:12px;font-weight:500}.primary{background:var(--green);color:white}.primary:hover{background:#256b60}.secondary{background:var(--paper);border:1px solid var(--line);color:var(--ink)}.text-button{padding:0;background:none;color:var(--green);font-weight:600}.side-panel{padding:23px;background:#eeeade}.side-panel h3{font-family:'Baloo 2',sans-serif;font-size:19px;font-weight:500;line-height:1.45;margin-bottom:22px}.step{display:flex;gap:13px;margin:17px 0}.step-num{font-size:10px;width:24px;height:24px;flex-shrink:0;display:grid;place-items:center;border:1px solid #c3c5b6;border-radius:50%}.step strong{font-size:11px;font-weight:600}.step p{font-size:10px;line-height:1.8;color:var(--muted);margin:5px 0}.source-note{border-top:1px solid #d2d1c2;margin-top:20px;padding-top:15px;font-size:10px;line-height:1.8;color:var(--muted)}.page-intro{margin:3px 0 27px;max-width:760px}.page-intro h1{font-family:'Baloo 2',sans-serif;font-size:36px;font-weight:500;margin:16px 0 12px}.page-intro p{font-size:13px;line-height:1.9;color:var(--muted)}.notice{border:1px solid #e4d8b7;background:#faf3df;color:#755c24;padding:13px 16px;border-radius:7px;font-size:11px;line-height:1.8;margin:18px 0}.columns{display:grid;grid-template-columns:1fr 1.05fr;gap:25px}.panel{border:1px solid var(--line);border-radius:12px;background:var(--white);padding:26px;min-width:0}.panel h2{font-size:17px;font-weight:600;margin-bottom:20px}.field{display:block;font-size:11px;font-weight:600;margin-bottom:17px}.field input,.field select,.field textarea{display:block;width:100%;margin-top:8px;border:1px solid #cdd3c6;border-radius:6px;padding:12px;background:#fffefb;color:var(--ink);font-size:12px;font-weight:400}.field small{display:block;color:var(--muted);font-weight:400;font-size:10px;line-height:1.7;margin-top:6px}.field textarea{min-height:120px;resize:vertical}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:15px}.button-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.media-frame{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#f1f0e7;margin-bottom:14px}.media-frame img{max-height:430px;width:100%;object-fit:contain;display:block;cursor:zoom-in}.media-frame iframe,.media-frame video{display:block;width:100%;aspect-ratio:16/9;border:0;min-height:205px}.media-placeholder{display:grid;place-items:center;text-align:center;min-height:250px;padding:30px;color:var(--muted)}.media-placeholder span{display:block;font-size:35px;margin-bottom:15px}.media-placeholder p{font-size:11px;line-height:1.8}.caption{font-size:11px;line-height:1.8;color:var(--muted);margin:12px 0 20px;overflow-wrap:anywhere}.caption strong{display:block;color:var(--ink);font-size:13px}.caption a{display:inline-block;margin-top:5px}.error{color:#a13c2a;font-size:11px;line-height:1.8;min-height:1.8em}.saved-media{display:grid;gap:10px;margin-top:18px}.saved-row{display:flex;justify-content:space-between;gap:12px;border:1px solid var(--line);padding:14px;border-radius:7px;align-items:center}.saved-row strong{font-size:12px}.saved-row p{font-size:10px;color:var(--muted);margin:5px 0}.saved-row button{font-size:10px;white-space:nowrap}.lesson-card{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}.lesson-card:last-child{border:0}.lesson-card h3{font-size:14px;margin:7px 0}.lesson-card p{font-size:10px;color:var(--muted);line-height:1.8;margin:0}.badge{font-size:9px;background:#eaf0e7;color:var(--green);padding:5px 7px;border-radius:4px;display:inline-block}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:23px 0}.metric{border:1px solid var(--line);padding:22px;border-radius:9px;background:var(--white)}.metric strong{display:block;font-family:'Baloo 2',sans-serif;font-size:30px;margin:0 0 7px}.metric span{font-size:11px;color:var(--muted)}.history-row{padding:20px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:20px}.history-row h3{font-size:13px;margin-bottom:9px}.history-row p{font-size:10px;line-height:1.7;color:var(--muted);margin:0}.history-score{font-size:23px;white-space:nowrap}.quiz-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:20px}.quiz-head span{font-size:11px;color:var(--muted)}.progress{height:4px;background:#e4e6dc;border-radius:3px;margin-bottom:25px;overflow:hidden}.progress span{display:block;background:var(--green);height:100%}.question-text{font-size:17px;line-height:1.8;font-weight:500;margin:10px 0 20px;white-space:pre-wrap}.option{display:flex;gap:12px;align-items:start;width:100%;text-align:left;background:var(--white);border:1px solid var(--line);border-radius:8px;padding:15px;margin-bottom:10px;color:var(--ink);font-size:12px;line-height:1.8}.option span{width:25px;height:25px;flex-shrink:0;border-radius:5px;background:var(--paper);text-align:center}.option.selected{border-color:var(--green);background:#edf2e9}.option.selected span{background:var(--green);color:white}.tf-row{padding:15px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr auto;gap:15px;align-items:center}.tf-row p{font-size:12px;line-height:1.8;margin:0}.tf-row button{padding:8px 11px;font-size:11px;background:var(--paper);border:1px solid var(--line);color:var(--ink)}.tf-row button.selected{background:var(--green);color:white}.quiz-actions{display:flex;justify-content:space-between;gap:15px;margin-top:25px}.result{text-align:center;padding:25px}.result .score{font-family:'Baloo 2',sans-serif;font-size:60px;color:var(--green);margin:20px 0}.result p{font-size:12px;color:var(--muted);line-height:1.9}.review{border-top:1px solid var(--line);padding:18px 0}.review summary{cursor:pointer;font-size:12px}.review p{font-size:12px;line-height:1.9;white-space:pre-wrap;margin-top:15px}.review .correct{color:var(--green)}.review .incorrect{color:#a13c2a}.full-width{width:100%}details.help{padding:18px 0;border-bottom:1px solid var(--line)}details.help summary{font-size:12px;font-weight:600;cursor:pointer}details.help p,details.help ol{font-size:12px;line-height:1.9;color:var(--muted)}details.help pre{overflow-x:auto;font-size:11px;background:var(--paper);padding:15px;line-height:1.7}.upload{padding:30px;border:1px dashed #b8c5b4;border-radius:9px;text-align:center;background:#f2f4ec}.upload p{font-size:11px;line-height:1.8;color:var(--muted)}.upload input{max-width:100%;font-size:11px}footer{max-width:1224px;margin:auto;border-top:1px solid var(--line);padding:24px 0;display:flex;justify-content:space-between;gap:20px;font-size:10px;color:var(--muted)}dialog{border:0;max-width:min(900px,95vw);border-radius:12px;padding:28px;background:var(--white);color:var(--ink)}dialog::backdrop{background:#102a24b0}dialog img{max-width:100%;max-height:75vh;display:block;margin:auto}dialog p{font-size:12px;line-height:1.8}dialog .close{display:block;margin-left:auto;background:transparent;border:0;font-size:28px;color:var(--ink)}#message{max-width:440px}#message h2{font-size:18px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);border-radius:7px;background:var(--ink);color:white;font-size:12px;max-width:90vw;padding:13px 20px;display:none;z-index:100}.load-error{max-width:600px;margin:70px auto}#main:focus{outline:0}
@media(min-width:1440px){.header{padding:0 48px}}@media(max-width:1300px){main,footer{margin-left:40px;margin-right:40px}.header{padding:0 40px}.hero h1{font-size:44px}.hero-copy{padding-left:38px}}
@media(max-width:950px){.header{padding:0 24px;gap:15px}.brand{font-size:14px}nav{gap:15px}nav button{font-size:11px}.teacher-button{font-size:10px;padding:10px}main,footer{margin-left:24px;margin-right:24px}.hero h1{font-size:37px}.hero-copy{padding:35px 0 35px 30px}.hero p{font-size:11px}.hero-art{min-height:300px}.workspace{grid-template-columns:1fr 230px;gap:15px}.columns{gap:15px}.panel{padding:20px}}
@media(max-width:720px){.header{height:auto;min-height:112px;padding:18px 20px 12px;flex-wrap:wrap;gap:16px}.brand{font-size:14px}.brand-icon{width:34px;height:39px;font-size:24px}.brand small{font-size:9px}.teacher-button{margin-left:auto}nav{order:3;justify-content:space-between;width:100%;gap:12px}nav button{font-size:11px;padding:8px 0}main{padding-top:24px;margin:0 18px;min-height:70vh}.hero{display:block;min-height:0}.hero-copy{padding:29px 25px 31px}.hero h1{font-size:37px;max-width:340px}.hero p{max-width:285px}.hero-art{display:none}.hero-tag{font-size:8px}.section-head{margin-top:28px;align-items:start}.section-head h2{font-size:23px}.section-head p{font-size:11px}.section-head>.tiny{max-width:100px;text-align:right;line-height:1.7}.grades{grid-template-columns:repeat(2,1fr);gap:10px}.grade{min-height:108px;padding:15px}.grade.active{padding:14px}.grade-number{font-size:29px}.grade p{font-size:10px;margin-top:8px}.workspace{grid-template-columns:1fr;margin-top:20px}.content-panel{padding:18px}.side-panel{margin-top:0}.side-panel h3{font-size:20px;margin-bottom:17px}.step{margin:12px 0}.side-panel .source-note{margin-top:15px}.filter-line{align-items:start;gap:10px;flex-direction:column}.filter-line select{max-width:100%;width:100%;font-size:10px}.empty{padding:28px 2px}.empty h3{font-size:14px}.empty p{font-size:11px}.columns{grid-template-columns:1fr}.page-intro h1{font-size:29px}.page-intro p{font-size:12px}.panel{padding:20px}.metrics{gap:8px}.metric{padding:14px 10px}.metric strong{font-size:25px}.metric span{font-size:9px}.lesson-card{align-items:start;flex-direction:column}.lesson-card .primary{width:100%}.tf-row{grid-template-columns:1fr;gap:8px}.question-text{font-size:15px}.quiz-actions{flex-wrap:wrap}.media-frame iframe,.media-frame video{min-height:200px}.page-intro .eyebrow{font-size:9px}footer{margin:0 18px;padding:20px 0;flex-direction:column;gap:10px;font-size:9px}.field-row{gap:10px}.field{font-size:10px}.history-row{gap:10px}.history-score{font-size:20px}dialog{padding:18px}.upload{padding:20px 10px}}
[hidden]{display:none!important}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* ---------- Hành trình Lịch sử: thương hiệu và trang chủ ---------- */
.brand img{display:block;width:52px;height:52px;flex:none}
.brand{font-family:'Baloo 2',sans-serif;font-size:19px;letter-spacing:.03em;color:var(--red)}
.brand small{font-family:'Be Vietnam Pro',sans-serif}
nav button{font-size:14px;min-height:44px}
nav button.active{color:var(--red);box-shadow:0 3px var(--red)}
.teacher-button{font-size:13px;min-height:44px;border-width:2px;border-radius:12px;background:var(--white);color:var(--ink)}
.primary,.secondary{border-radius:14px;font-size:14px;font-weight:700;min-height:46px}
.primary{background:var(--red);box-shadow:0 4px 0 #8E1B1B}
.primary:hover{background:#A81F1F}
.secondary{border-width:2px;background:var(--white)}
.text-button{font-size:14px}
.journey-hero{display:flex;align-items:center;gap:24px;background:var(--red);color:#fff;border-radius:28px;padding:28px 32px}
.journey-hero img{flex:none;width:132px;height:132px}
.journey-hero .eyebrow{color:var(--gold);font-size:13px}
.journey-hero h1{font:800 clamp(34px,6vw,56px)/1.05 'Baloo 2',sans-serif;margin:8px 0 6px}
.journey-hero p{font-size:16px;line-height:1.5;margin:0}
.grade-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:22px 0 6px}
.grade-tab{min-height:54px;border:2px solid var(--line);border-radius:16px;background:var(--white);color:var(--muted);font:700 20px 'Baloo 2',sans-serif}
.grade-tab.active{background:var(--gold);border-color:#C98F00;color:var(--ink);box-shadow:0 4px 0 #C98F00;font-weight:800}
.chapter{margin-top:24px}
.chapter-head span{font-size:13px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--green)}
.chapter-head h2{font:700 24px/1.25 'Baloo 2',sans-serif;margin:2px 0 14px}
.journey-lesson{display:flex;align-items:center;gap:18px;background:var(--green);color:#fff;border-radius:24px;padding:20px 22px;box-shadow:0 6px 0 #084F4F;margin-bottom:16px}
.lesson-number{flex:none;width:64px;height:64px;border-radius:50%;background:var(--gold);color:var(--ink);display:grid;place-items:center;font:800 28px 'Baloo 2',sans-serif}
.journey-lesson-body{flex:1;min-width:0}
.journey-lesson h3{font:800 24px/1.2 'Baloo 2',sans-serif;margin:0 0 4px}
.journey-lesson p{font-size:14px;margin:0 0 10px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips span{background:#fff;color:#084F4F;border-radius:999px;padding:4px 12px;font-size:13px;font-weight:600}
.play-button{flex:none;display:grid;place-items:center;min-height:56px;padding:0 28px;border-radius:18px;background:var(--gold);color:var(--ink);text-decoration:none;font:800 21px 'Baloo 2',sans-serif;box-shadow:0 4px 0 #C98F00}
.play-button:hover{background:#FFD766}
.journey-note{color:var(--muted);font-size:14px;margin:4px 0 0}
.empty h3{font-size:18px}.empty p{font-size:14px}
footer{font-size:12px}
@media(max-width:720px){.journey-hero{flex-direction:column;text-align:center;padding:24px 20px;gap:12px}.journey-hero img{width:104px;height:104px}.journey-hero .eyebrow{justify-content:center}.journey-hero .eyebrow:before{display:none}.grade-tabs{gap:8px}.grade-tab{font-size:17px}.journey-lesson{flex-direction:column;align-items:stretch;text-align:left;padding:18px}.lesson-number{width:52px;height:52px;font-size:24px}.journey-lesson h3{font-size:21px}.play-button{width:100%}.brand{font-size:16px}.brand img{width:44px;height:44px}nav button{font-size:13px}}
.journey-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.journey-grid .journey-lesson{margin-bottom:0;padding:16px 18px;gap:14px}
.journey-grid .journey-lesson h3{font-size:20px}
.journey-grid .journey-lesson p{margin:0}
.journey-grid .lesson-number{width:52px;height:52px;font-size:24px}
.journey-grid .play-button{min-height:48px;padding:0 18px;font-size:18px}
.chips:empty{display:none}
@media(max-width:900px){.journey-grid{grid-template-columns:1fr}}
.brand-group{display:flex;align-items:center;gap:12px;min-width:0}.school-logo{width:30px;height:30px;flex:none;display:block}.app-maker{max-width:1224px;margin:0 auto;padding:0 20px 18px;text-align:right;font-size:11px;color:var(--muted)}
.grade-tab{display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.1;padding:6px 4px}.grade-tab small{font:600 11px 'Be Vietnam Pro',sans-serif;margin-top:3px;opacity:.85}.best-result{margin:6px 0 0!important;font-size:13px!important;background:#ffffff1f;border-radius:10px;padding:4px 10px;display:inline-block}.best-result span{opacity:.85}.grade-tab{transition:transform .15s ease}.grade-tab:active{transform:translateY(2px)}
.lesson-actions{display:flex;flex-direction:column;gap:10px;flex:none}.play-button.alt{background:#fff;box-shadow:0 4px 0 #cfe3e1;font-size:17px;min-height:46px}.play-button.alt:hover{background:#f2fbfa}.chapter-head p{margin:6px 0 0;color:var(--muted);font-size:15px;max-width:70ch}.chips span.hsg{background:var(--gold)}

.app-maker.app-copy{padding-top:0;padding-bottom:18px;line-height:1.6}.app-maker+.app-copy{margin-top:-10px}