:root{--green:#1f6b4a;--deep:#164b36;--mint:#e8f2e9;--cream:#f8f6ed;--paper:#fffef9;--ink:#20352b;--muted:#718078;--line:#e4e9df;--orange:#e7a65b;--red:#b94e42}*{box-sizing:border-box}body{margin:0;background:var(--cream);color:var(--ink);font-family:Arial,sans-serif}.topbar{height:72px;background:var(--paper);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 4vw;position:sticky;top:0;z-index:5}.brand{display:flex;gap:12px;align-items:center}.brandmark{width:40px;height:40px;border-radius:13px;background:var(--green);color:white;display:grid;place-items:center;font:800 22px Arial, sans-serif}.brand b{font:800 17px Arial, sans-serif;display:block}.brand small{font-size:11px;color:var(--muted)}.shell{display:grid;grid-template-columns:220px 1fr;max-width:1500px;margin:auto;min-height:calc(100vh - 72px)}.sidebar{padding:26px 16px;border-right:1px solid var(--line);display:flex;flex-direction:column;justify-content:space-between}.sidebar nav{display:grid;gap:7px}.nav{border:0;background:transparent;text-align:left;padding:13px 14px;border-radius:12px;color:#637269;font:600 14px Arial;cursor:pointer}.nav span{margin-left:9px}.nav.active,.nav:hover{background:var(--mint);color:var(--green)}.side-note{background:#eef3e8;border-radius:16px;padding:17px;font-size:13px}.side-note p{margin:7px 0;color:var(--green);font-weight:700}.side-note small{color:var(--muted)}main{padding:36px clamp(20px,4vw,60px);min-width:0}.page{display:none}.page.active{display:block}.hero{background:var(--green);color:white;border-radius:24px;padding:42px 48px;display:flex;align-items:center;justify-content:space-between;overflow:hidden;min-height:260px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:800;color:#8aa694}.hero .eyebrow{color:#c1d9c8}.hero h1{font:800 clamp(27px,3vw,39px) Arial, sans-serif;margin:12px 0}.hero p{color:#e1eee5;max-width:490px;line-height:1.6}.hero-art{font:800 52px/0.98 Arial, sans-serif;text-align:right;color:#e9f1df;transform:rotate(-7deg);padding:10px 25px}.hero-art em{color:#efc58a}.hero-art span{display:block;font-size:18px;letter-spacing:7px;margin-top:20px;color:#c1d9c8}.primary,.secondary,.ghost,.danger,.textbtn,.topic,.upload{border:0;border-radius:11px;padding:11px 17px;font:700 13px Arial;cursor:pointer}.primary{background:var(--green);color:white}.hero .primary{background:#f2d7a7;color:#244a35;margin-top:8px}.secondary{background:#edf2eb;color:var(--green);border:1px solid var(--line)}.ghost{background:var(--mint);color:var(--green)}.danger{background:#f9e9e6;color:var(--red)}.textbtn{padding:5px 0;background:none;color:var(--green)}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:22px 0 34px}.stats article,.quick,.form-card{background:var(--paper);border:1px solid var(--line);border-radius:17px;padding:20px}.stats small,.stats span{display:block;color:var(--muted);font-size:12px}.stats strong{display:block;font:800 29px Arial, sans-serif;color:var(--green);margin:7px 0}.section-head{display:flex;justify-content:space-between;align-items:end;margin:27px 0 14px}.section-head h2,.page-title h1{font:800 25px Arial, sans-serif;margin:5px 0}.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.quick p{font-size:13px;line-height:1.5;color:var(--muted);min-height:40px}.quick h3{margin:12px 0 4px}.qicon{font-size:24px;color:var(--green)}.topic-row{display:flex;gap:10px;flex-wrap:wrap}.topic{background:#fff;border:1px solid var(--line);color:var(--green)}.page-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px}.page-title p{color:var(--muted);margin:5px 0}.pill{background:var(--mint);color:var(--green);border-radius:30px;padding:8px 13px;font-size:12px;font-weight:700}.study-tools,.toolbar{display:flex;gap:12px;align-items:center;margin-bottom:18px;flex-wrap:wrap}select,input,textarea{font:13px Arial;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:#fffefb;color:var(--ink);outline-color:#9bbda5}select{min-width:150px}.checkline{font-size:13px;color:var(--muted)}.flash-wrap{display:flex;justify-content:center;perspective:1000px}.flashcard{width:min(600px,100%);min-height:290px;position:relative;transform-style:preserve-3d;transition:transform .5s;cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.card-face{position:absolute;inset:0;backface-visibility:hidden;border:1px solid var(--line);border-radius:23px;background:var(--paper);box-shadow:0 14px 40px #20352b0d;display:flex;align-items:center;justify-content:center;flex-direction:column;padding:30px;text-align:center}.card-face small{font-size:10px;letter-spacing:2px;color:#8a9a8f;font-weight:800}.card-face div{font:800 35px Arial, sans-serif;margin:24px 0;color:var(--green)}.card-face p{font-size:12px;color:var(--muted)}.card-face.back{transform:rotateY(180deg);background:#eff5eb}.card-face.back div{font:600 16px/1.7 Arial;white-space:pre-line;color:var(--ink)}.card-actions,.rating{display:flex;justify-content:center;gap:10px;margin:18px}.rating button{border:0;border-radius:10px;padding:11px 18px;font-weight:700;cursor:pointer}.again{background:#f9e9e6;color:#a7473e}.hard{background:#fff1d9;color:#93601c}.easy{background:#e4f2e8;color:var(--green)}.hint{max-width:600px;margin:20px auto;background:#f0f1e7;padding:14px 18px;border-radius:12px;color:#66746b;font-size:12px;line-height:1.5}.hidden{display:none!important}.game-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.game-tile{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:20px;text-align:left;cursor:pointer}.game-tile:hover{border-color:#9bbda5;transform:translateY(-2px)}.game-tile .emoji{font-size:25px}.game-tile h3{margin:12px 0 5px}.game-tile p{font-size:12px;color:var(--muted);line-height:1.5}.game-stage{margin-top:20px;padding:25px;background:var(--paper);border:1px solid var(--line);border-radius:20px}.game-head{display:flex;justify-content:space-between}.game-stage h2{font:800 23px Arial, sans-serif}.game-question{font:800 25px Arial, sans-serif;text-align:center;margin:30px 0;color:var(--green)}.options{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;max-width:650px;margin:0 auto}.option{background:#f2f5ee;border:1px solid var(--line);padding:15px;border-radius:12px;text-align:left;cursor:pointer;font-weight:600}.option:hover{border-color:var(--green)}.option.correct{background:#e2f3e7;border-color:#7fb48d}.option.wrong{background:#fae8e4;border-color:#d79b92}.feedback{text-align:center;min-height:35px;padding:12px;color:var(--green);font-weight:700}.game-stage>.primary{display:block;margin:10px auto}.toolbar input{flex:1;min-width:220px}.table-wrap{overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:15px}table{border-collapse:collapse;width:100%;font-size:13px}th,td{text-align:left;padding:13px 15px;border-bottom:1px solid var(--line)}th{font-size:11px;color:var(--muted);background:#f8f8f1}td:first-child{font-weight:700;color:var(--green)}td button{border:0;background:none;color:var(--muted);cursor:pointer}.form-card{margin-top:18px}.form-card h3{margin-top:0}.form-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.form-grid label,.form-card>label{display:grid;gap:6px;font-size:12px;color:var(--muted);margin:12px 0}.form-grid input,.form-card>label input,.form-card textarea,.form-card>label select{width:100%}.wide{grid-column:1/-1}.form-actions,.button-row{display:flex;gap:10px;justify-content:flex-end;margin-top:17px}.button-row{justify-content:flex-start}.upload{display:inline-flex;align-items:center;background:#edf2eb;color:var(--green);position:relative}.upload input{position:absolute;inset:0;opacity:0;width:100%;cursor:pointer}.settings-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.muted{color:var(--muted);font-size:12px;line-height:1.6}.ai-layout{display:grid;grid-template-columns:1fr 1fr;gap:15px}.ai-layout .form-card{margin:0}.ai-output{background:#f1f4ed;padding:14px;border-radius:12px;white-space:pre-wrap;overflow:auto;min-height:150px;font:12px/1.6 monospace}.status{padding:12px;background:#f3f1e5;border-radius:10px;font-size:12px;color:#79633a;margin-top:12px}.route{display:flex;justify-content:space-between;gap:15px;padding:13px 0;border-bottom:1px solid var(--line);font-size:13px}.route span{color:var(--muted);text-align:right}.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#20352b;color:white;padding:12px 20px;border-radius:30px;font-size:13px;opacity:0;pointer-events:none;transition:.2s;z-index:10}.toast.show{opacity:1}.game-stage .textbtn{font-size:13px}
@media(max-width:850px){.shell{grid-template-columns:1fr}.sidebar{padding:8px 12px;border-right:0;border-bottom:1px solid var(--line);position:sticky;top:72px;background:var(--cream);z-index:4}.sidebar nav{display:flex;overflow:auto}.nav{white-space:nowrap;padding:10px}.nav span{margin-left:5px}.side-note{display:none}main{padding:24px 16px}.hero{padding:28px;min-height:220px}.hero-art{font-size:35px;padding:0}.stats{grid-template-columns:repeat(2,1fr)}.quick-grid,.game-grid{grid-template-columns:repeat(2,1fr)}.ai-layout{grid-template-columns:1fr}}@media(max-width:560px){.hero-art{display:none}.quick-grid,.game-grid,.settings-grid{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr 1fr}.wide{grid-column:1/-1}.page-title{align-items:flex-start;gap:10px}.page-title h1{font-size:23px}.card-face div{font-size:28px}.options{grid-template-columns:1fr}.stats article{padding:15px}.topbar{padding:0 16px}}

/* Sentence builder v0.1.1: tap-to-build and reorder controls */
.builder-label{max-width:760px;margin:18px auto 9px;color:var(--muted);font-size:13px;font-weight:700}
.builder-bank,.builder-answer{max-width:760px;min-height:58px;margin:0 auto 14px;padding:12px;display:flex;flex-wrap:wrap;align-items:center;gap:9px;border:1px dashed #cbd8cb;border-radius:14px;background:#f8faf5}
.builder-answer{background:#fffef9;border-style:solid;min-height:68px}
.builder-chip{border:1px solid #dce6da;border-radius:10px;background:#edf3e9;color:var(--deep);padding:11px 15px;font:700 15px Arial,sans-serif;cursor:pointer;touch-action:manipulation}
.builder-chip:active{transform:scale(.97)}
.builder-chip.picked{background:#e2f0e5;border-color:#9fc4a7}
.builder-picked{display:inline-flex;align-items:center;gap:3px}
.builder-move{display:inline-flex;gap:2px}
.builder-move button{border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--green);min-width:27px;min-height:30px;font-weight:800}
.builder-move button:disabled{opacity:.25}
.builder-placeholder{color:#9aa69d;font-size:13px;padding:7px}
.builder-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:14px auto}

/* Deutsch Meister 0.2.0: responsive mobile-first layout */
html,body{max-width:100%;min-width:0}
body{overflow-x:clip}
button,input,select,textarea{max-width:100%}
.topbar{width:100%;min-width:0}
.brand,.brand>div,main,.page,.page-title,.game-stage,.form-card,.quick,.stats article{min-width:0}
.hero h1,.hero p,.page-title h1,.game-question,.game-stage h2{overflow-wrap:anywhere}
.primary,.ghost,.danger,.topic,.upload,.nav,.game-tile,.option,.builder-chip,.builder-move button,.game-stage .secondary,#page-vocab .page-title>.primary,#page-vocab td button{min-height:44px}
.option{display:flex;align-items:center}
.game-tile{height:100%}
.builder-bank,.builder-answer{align-content:flex-start;justify-content:flex-start}

@media(max-width:900px){
  .shell{grid-template-columns:minmax(0,1fr);width:100%;min-width:0}
  .sidebar{position:sticky;top:64px;z-index:6;padding:6px 10px;border-right:0;border-bottom:1px solid var(--line);background:var(--cream);min-width:0}
  .sidebar nav{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:4px;width:100%;max-width:100%;min-width:0}
  .nav{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;white-space:normal;text-align:center;min-width:0;width:100%;min-height:48px;padding:5px 3px;font-size:12px;line-height:1.15}
  .nav span{margin:0;overflow-wrap:anywhere}
  .side-note{display:none}
  main{padding:22px clamp(16px,3vw,30px)}
  main:has(#page-cards.active){padding:36px clamp(20px,4vw,60px)}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  .quick-grid,.game-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .ai-layout{grid-template-columns:1fr}
  .game-stage{padding:20px}
  .game-grid{align-items:stretch}
  .table-wrap{max-width:100%}
}

@media(max-width:600px){
  .topbar{height:60px;padding:0 12px}
  .brand{gap:9px}
  .brandmark{width:36px;height:36px;border-radius:11px;font-size:20px}
  .brand b{font-size:15px}
  .brand small{font-size:10px}
  .sidebar{top:60px;padding:6px 8px}
  .sidebar nav{grid-template-columns:repeat(3,minmax(0,1fr));gap:4px}
  .nav{display:grid;grid-template-columns:18px minmax(0,1fr);justify-items:start;align-content:center;gap:5px;text-align:left;min-height:46px;padding:5px 7px;font-size:11px;line-height:1.15}
  .nav span{margin:0;min-width:0}
  main{padding:16px 12px}
  main:has(#page-cards.active){padding:24px 16px}
  .hero{min-height:0;padding:22px 18px;border-radius:18px}
  .hero h1{font-size:clamp(24px,7vw,30px);line-height:1.15}
  .hero p{font-size:14px;line-height:1.5;margin:8px 0 12px}
  .hero .primary{margin-top:4px}
  .stats{gap:8px;margin:14px 0 22px}
  .stats article{padding:13px;border-radius:14px}
  .stats strong{font-size:25px}
  .stats small,.stats span{font-size:11px}
  .section-head{margin:20px 0 12px}
  .section-head h2,.page-title h1{font-size:22px}
  .quick-grid,.game-grid,.settings-grid{grid-template-columns:minmax(0,1fr);gap:10px}
  .quick,.game-tile{padding:15px;border-radius:14px}
  .quick p{min-height:0;margin:6px 0 10px}
  .page-title{align-items:flex-start;gap:8px;margin-bottom:17px;flex-wrap:wrap}
  .page-title p{font-size:13px;line-height:1.45}
  .page-title>.pill{flex:0 0 auto}
  .study-tools,.toolbar{display:grid;grid-template-columns:minmax(0,1fr);gap:8px;margin-bottom:14px}
  .study-tools select,.toolbar select,.toolbar input{width:100%;min-width:0;min-height:44px}
  .game-stage{margin-top:12px;padding:14px;border-radius:16px}
  .game-head{align-items:center;gap:8px}
  .game-stage h2{font-size:20px}
  .game-question{font-size:clamp(19px,5.5vw,24px);line-height:1.3;margin:18px 0}
  .options{grid-template-columns:minmax(0,1fr);gap:8px}
  .option{min-height:52px;padding:12px;border-radius:11px}
  .feedback{padding:8px 4px;line-height:1.4}
  .builder-label{margin:12px auto 6px;font-size:12px;line-height:1.35}
  .builder-bank,.builder-answer{width:100%;max-width:100%;min-height:54px;margin:0 auto 10px;padding:8px;gap:7px;border-radius:12px}
  .builder-answer{min-height:62px}
  .builder-chip{min-width:44px;min-height:44px;padding:8px 10px;font-size:14px;line-height:1.2;white-space:normal;overflow-wrap:anywhere}
  .builder-picked{max-width:100%;gap:4px;flex-wrap:wrap}
  .builder-move{gap:3px}
  .builder-move button{min-width:44px;min-height:44px;padding:0 8px;border-radius:9px}
  .builder-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:10px auto}
  .builder-actions button,.game-stage .secondary{width:100%;min-height:44px;padding:9px 8px}
  .game-stage .textbtn{min-height:44px}
  .page:not(#page-cards) input,.page:not(#page-cards) select,.page:not(#page-cards) textarea,.page:not(#page-cards) .secondary,.quick .textbtn{min-height:44px}
  .form-grid{grid-template-columns:minmax(0,1fr)}
  .wide{grid-column:auto}
  .form-actions,.button-row{flex-wrap:wrap;justify-content:flex-start}
  .form-actions>* ,.button-row>*{flex:1 1 140px;min-height:44px}
  .ai-output{max-width:100%;overflow-wrap:anywhere}
  .route{flex-direction:column;gap:5px;align-items:flex-start}
  .route span{text-align:left;overflow-wrap:anywhere}
  #page-vocab .page-title{align-items:stretch;flex-direction:column}
  #page-vocab .page-title>.primary{align-self:flex-start}
  #page-vocab .table-wrap{overflow:visible;border:0;background:transparent}
  #page-vocab table,#page-vocab tbody{display:block;width:100%}
  #page-vocab thead{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
  #page-vocab tbody{display:grid;gap:10px}
  #page-vocab tbody tr{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 10px;padding:10px;background:var(--paper);border:1px solid var(--line);border-radius:14px}
  #page-vocab tbody td{min-width:0;padding:5px 2px;border:0;overflow-wrap:anywhere}
  #page-vocab tbody td:first-child{grid-column:1/-1;font-size:15px}
  #page-vocab tbody td:nth-child(2),#page-vocab tbody td:nth-child(5){grid-column:1/-1}
  #page-vocab tbody td:nth-child(2)::before{content:'Nghĩa · ';font-size:11px;color:var(--muted);font-weight:600}
  #page-vocab tbody td:nth-child(3)::before{content:'Chủ đề · ';font-size:11px;color:var(--muted);font-weight:600}
  #page-vocab tbody td:nth-child(4)::before{content:'Cấp độ · ';font-size:11px;color:var(--muted);font-weight:600}
  #page-vocab tbody td:nth-child(5){display:flex;align-items:center;gap:8px;border-top:1px solid var(--line);padding-top:7px}
  #page-vocab td button{min-width:44px;min-height:44px;padding:8px 10px}
  .toast{max-width:calc(100vw - 24px);text-align:center}
}

@media(max-width:380px){
  .brand small{display:none}
  .nav{padding:5px 5px;font-size:10px}
  .builder-actions{grid-template-columns:minmax(0,1fr)}
  .stats article{padding:11px}
}
#dataStatus{white-space:pre-line}
.card-actions{margin:18px auto 10px}
.card-actions button,.rating button,#startNewCardRound{min-height:44px}
.card-summary,.card-empty{max-width:600px;margin:18px auto;padding:26px;text-align:center;background:var(--paper);border:1px solid var(--line);border-radius:18px}
.card-summary h2{margin:10px 0;color:var(--green);font:800 24px Arial, sans-serif}
.card-summary p{color:var(--muted);font-weight:700}
.card-summary button{margin-top:8px}
.card-empty{color:var(--muted);font-weight:700}
.card-feedback{max-width:600px;margin:8px auto;text-align:center;color:var(--red);font-size:13px;line-height:1.5}
.rating button:disabled{opacity:.55;cursor:not-allowed}
@media(max-width:560px){.rating{flex-wrap:wrap;gap:8px}.rating button{flex:1 1 130px}.card-summary,.card-empty{padding:20px 14px}}
/* Shared end-of-round screen for the seven games. */
.game-summary{max-width:680px;margin:10px auto 4px;padding:clamp(20px,5vw,36px);border:1px solid var(--line);border-radius:20px;background:linear-gradient(145deg,#f3f7ef,var(--paper) 62%);text-align:center;overflow-wrap:anywhere}
.game-summary-mark{display:grid;place-items:center;width:54px;height:54px;margin:0 auto 12px;border-radius:50%;background:var(--mint);color:var(--green);font-size:28px;font-weight:800}
.game-summary h3{margin:8px 0;font:800 clamp(24px,4vw,32px) Arial, sans-serif;color:var(--green)}
.game-summary-name{margin:0;color:var(--muted);font-weight:700}
.game-summary-score{display:flex;flex-direction:column;gap:2px;margin:22px 0 8px;color:var(--muted)}
.game-summary-score strong{color:var(--green);font:800 clamp(42px,9vw,60px)/1 Arial, sans-serif}
.game-summary-accuracy{margin:8px 0 24px;color:var(--muted)}
.game-summary-accuracy strong{color:var(--ink)}
.game-summary-actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.game-summary-actions button{min-width:0;min-height:48px;padding:12px 14px;line-height:1.25;white-space:normal}
.game-summary-actions button:hover{filter:brightness(.97)}
.game-summary-actions button:focus-visible{outline:3px solid #9bbda5;outline-offset:3px}
.game-summary-actions button:disabled{cursor:not-allowed;opacity:.55}
@media(max-width:600px){.game-summary{padding:22px 16px}.game-summary-actions{grid-template-columns:1fr;gap:9px}.game-summary-actions button{width:100%;min-height:48px}}