:root{
  --bg:#f6f4ef; --card:#fffdf9; --ink:#17302f; --muted:#5f6f6c; --line:#e6e1d6;
  --brand:#1d4746; --brand-ink:#ffffff; --mint:#5ec4b1; --mint-soft:#e3f4f0;
  --coral:#ef8a7a; --coral-soft:#fde9e5; --sun:#f2b33d; --sun-soft:#fdf1d8;
  --good:#2f9e78; --bad:#d9574a; --hero:#1d4746; --hero-ink:#ffffff;
  --shadow:0 1px 0 rgba(23,48,47,.04);
}
:root[data-theme="dark"]{
  --bg:#0f1a1a; --card:#172524; --ink:#e9f1ef; --muted:#94a8a4; --line:#26403e;
  --brand:#5ec4b1; --brand-ink:#0f1a1a; --mint:#5ec4b1; --mint-soft:#1d3634;
  --coral:#f19a8b; --coral-soft:#3a2522; --sun:#f5c25e; --sun-soft:#3a3020;
  --good:#5ec4b1; --bad:#f08376; --hero:#1d3a39; --hero-ink:#e9f1ef;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0f1a1a; --card:#172524; --ink:#e9f1ef; --muted:#94a8a4; --line:#26403e;
    --brand:#5ec4b1; --brand-ink:#0f1a1a; --mint:#5ec4b1; --mint-soft:#1d3634;
    --coral:#f19a8b; --coral-soft:#3a2522; --sun:#f5c25e; --sun-soft:#3a3020;
    --good:#5ec4b1; --bad:#f08376; --hero:#1d3a39; --hero-ink:#e9f1ef;
  }
}
html{font-size:16px}
html[data-size="s"]{font-size:14.5px}
html[data-size="l"]{font-size:18px}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Be Vietnam Pro",system-ui,-apple-system,sans-serif;font-size:1rem;line-height:1.55}
button{font:inherit;color:inherit;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
.h{font-family:"Lexend","Be Vietnam Pro",sans-serif;letter-spacing:-.03em}

/* đầu trang */
.top{position:sticky;top:0;z-index:10;background:var(--bg);padding:calc(8px + env(safe-area-inset-top)) 16px 0}
.top .bar1{display:flex;align-items:center;gap:8px;max-width:760px;margin:0 auto}
.logo{font-family:"Lexend",sans-serif;font-weight:800;font-size:1.3rem;letter-spacing:-.04em;flex:1;white-space:nowrap}
.logo i{font-style:normal;color:var(--coral)}
.pill{display:flex;border:1px solid var(--line);border-radius:99px;padding:3px;background:var(--card)}
.pill button{border:0;background:none;border-radius:99px;min-width:30px;height:30px;font-weight:700;font-size:.8rem;color:var(--muted)}
.pill button.on{background:var(--brand);color:var(--brand-ink)}
.round{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--card);display:grid;place-items:center;font-size:1rem}
.tabs{display:flex;max-width:760px;margin:6px auto 0;border-bottom:1px solid var(--line)}
.tabs button{flex:1;border:0;background:none;padding:10px 2px 11px;font-weight:700;font-size:.92rem;color:var(--muted);position:relative}
.tabs button.on{color:var(--ink)}
.tabs button.on::after{content:"";position:absolute;left:12%;right:12%;bottom:-1px;height:3px;border-radius:3px;background:var(--mint)}
.tabs .dot{display:inline-block;min-width:18px;height:18px;line-height:18px;padding:0 5px;margin-left:4px;border-radius:9px;background:var(--coral);
  color:#fff;font-size:.7rem;font-style:normal;vertical-align:1px}
.tabs .dot:empty{display:none}

main{max-width:760px;margin:0 auto;padding:16px 16px calc(40px + env(safe-area-inset-bottom))}
h1{font-family:"Lexend",sans-serif;letter-spacing:-.035em;font-size:2rem;line-height:1.1;margin:4px 0 8px;font-weight:800}
h2{font-family:"Lexend",sans-serif;letter-spacing:-.03em;font-size:1.25rem;margin:0 0 10px;font-weight:700}
.sub{color:var(--muted);margin:0 0 16px}
.eyebrow{display:flex;align-items:center;gap:8px;font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--brand);margin-bottom:6px}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--mint)}
.muted{color:var(--muted)}
.small{font-size:.88rem}

.card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:20px;margin-bottom:14px;box-shadow:var(--shadow)}
.hero{background:var(--hero);color:var(--hero-ink);border:0;padding:26px 24px;position:relative;overflow:hidden}
.hero h1{font-size:1.85rem;margin:0 0 22px}
.hero h1 em{display:block;font-style:normal;color:var(--mint)}
.hero .nums{display:flex}
.hero .nums div{flex:1;padding:0 10px;border-left:1px solid rgba(255,255,255,.18)}
.hero .nums div:first-child{padding-left:0;border-left:0}
.hero .nums b{display:block;font-family:"Lexend",sans-serif;font-size:1.55rem;letter-spacing:-.03em}
.hero .nums span{font-size:.78rem;opacity:.8}
.hero::after{content:"";position:absolute;right:-50px;top:-50px;width:170px;height:170px;border-radius:50%;border:2px solid rgba(94,196,177,.35)}

.row{display:flex;align-items:center;gap:12px}
.grow{flex:1;min-width:0}
.prog{height:10px;border-radius:99px;background:var(--mint-soft);overflow:hidden}
.prog i{display:block;height:100%;background:var(--mint);border-radius:99px;transition:width .3s}
.hero .prog{background:rgba(255,255,255,.15)}

.btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;border:0;border-radius:99px;padding:14px 18px;
  font-weight:700;font-size:1rem;background:var(--brand);color:var(--brand-ink)}
.btn.line{background:var(--card);color:var(--ink);border:1px solid var(--line)}
.btn.mint{background:var(--mint);color:#0f2a28}
.btn.good{background:var(--good);color:#fff}
.btn.bad{background:var(--bad);color:#fff}
.btn.sm{width:auto;padding:9px 16px;font-size:.88rem}
.btn:disabled{opacity:.45}
.btns{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.btns .btn{flex:1;min-width:130px}

/* cây */
.tree{display:flex;gap:16px;align-items:center}
.tree .pic{font-size:3.2rem;width:84px;height:84px;border-radius:24px;background:var(--mint-soft);display:grid;place-items:center;flex:none}
.xpbox{background:var(--mint-soft);border-radius:18px;padding:14px 16px;margin-top:14px}
.pct{background:var(--card);border-radius:99px;padding:4px 12px;font-weight:800;font-size:.9rem}
.stages{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;margin-top:12px;text-align:center}
.stages div{font-size:.7rem;color:var(--muted);line-height:1.25}
.stages b{display:block;font-size:1.15rem;filter:grayscale(1);opacity:.45}
.stages .on b{filter:none;opacity:1}
.stages .on{color:var(--ink);font-weight:700}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-top:12px}
.week div{text-align:center;font-size:.75rem;font-weight:700;color:var(--muted)}
.week i{display:grid;place-items:center;margin:4px auto 0;width:34px;height:34px;border-radius:50%;border:2px dashed var(--line);font-style:normal;font-size:.95rem}
.week .on i{border:0;background:var(--sun);}
.week .today i{border-color:var(--mint);border-style:solid}
.big{font-family:"Lexend",sans-serif;font-weight:800;font-size:2.4rem;letter-spacing:-.04em;line-height:1}

.task{display:flex;align-items:center;gap:12px;padding:12px 0;border-top:1px solid var(--line)}
.task:first-of-type{border-top:0;padding-top:0}
.task .ic{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:var(--mint-soft);font-size:1.25rem;flex:none}
.task .t{font-weight:700}
.task .d{color:var(--muted);font-size:.88rem}
.task.done .t{text-decoration:line-through;color:var(--muted)}
.arrow{width:40px;height:40px;border-radius:50%;border:0;background:var(--brand);color:var(--brand-ink);font-weight:800;flex:none}

/* lộ trình */
.seg{display:flex;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:5px;margin-bottom:16px}
.seg button{flex:1;border:0;background:none;border-radius:14px;padding:10px 4px;font-weight:700;font-size:.9rem;color:var(--ink);line-height:1.25}
.seg button.on{background:var(--brand);color:var(--brand-ink)}
.picker{background:var(--hero);color:var(--hero-ink);border-radius:24px;overflow:hidden;margin-bottom:14px}
.picker .hd{padding:20px 20px 14px}
.picker .hd .eyebrow{color:var(--mint)}
.picker .hd h2{margin:0}
.picker .hd p{margin:4px 0 0;opacity:.75;font-size:.88rem}
.tiles{display:flex;gap:10px;overflow-x:auto;padding:14px;background:var(--card);scroll-snap-type:x mandatory;scrollbar-width:none}
.tiles::-webkit-scrollbar{display:none}
.tile{flex:none;width:250px;scroll-snap-align:start;display:flex;gap:12px;align-items:center;text-align:left;border:1px solid var(--line);
  background:var(--card);color:var(--ink);border-radius:18px;padding:12px}
.tile.on{background:var(--mint-soft);border-color:var(--mint)}
.tile .num{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;font-family:"Lexend",sans-serif;font-weight:800;font-size:1.2rem;flex:none;color:#17302f}
.tile .nm{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tile .mt{font-size:.78rem;color:var(--muted);margin-bottom:6px}
.tile .prog{height:6px}
.boxes{display:flex;gap:10px;margin:8px 0 14px;flex-wrap:wrap}
.boxes div{border:1px solid var(--line);border-radius:16px;padding:8px 14px;font-family:"Lexend",sans-serif;font-weight:800;font-size:1.35rem;letter-spacing:-.03em}
.boxes span{font-family:"Be Vietnam Pro",sans-serif;font-weight:500;font-size:.9rem;letter-spacing:0;color:var(--muted)}
.boxes .star{color:var(--sun)}
.lesson{display:flex;align-items:center;gap:12px;padding:12px 0;border-top:1px solid var(--line)}
.lesson .n{width:40px;height:40px;border-radius:12px;background:var(--mint-soft);display:grid;place-items:center;font-weight:800;flex:none}
.lesson.ok .n{background:var(--mint);color:#0f2a28}
.lesson .t{font-weight:700}
.lesson .prog{height:6px;margin-top:6px}

.chips{display:flex;gap:8px;overflow-x:auto;padding:2px 0 12px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chip{flex:none;border:1px solid var(--line);background:var(--card);border-radius:99px;padding:7px 14px;font-size:.88rem;font-weight:700;color:var(--muted)}
.chip.on{background:var(--brand);border-color:var(--brand);color:var(--brand-ink)}
.search{width:100%;border:1px solid var(--line);background:var(--card);border-radius:16px;padding:12px 16px;margin-bottom:12px}
textarea.search{min-height:170px;resize:vertical;line-height:1.5}
.legend{display:flex;gap:16px;font-size:.85rem;color:var(--muted);flex-wrap:wrap}
.legend span{display:flex;align-items:center;gap:6px}
.legend b{color:var(--ink)}
.st{width:10px;height:10px;border-radius:50%;border:2px solid var(--line);flex:none;display:inline-block}
.st.s1{border-color:var(--mint)}
.st.s2{background:var(--mint);border-color:var(--mint)}

.item{background:var(--card);border:1px solid var(--line);border-radius:18px;margin-bottom:8px;overflow:hidden}
.item .head{display:flex;align-items:center;gap:10px;padding:12px 12px 12px 14px;cursor:pointer}
.item .w{font-weight:700}
.item .v{color:var(--muted);font-size:.88rem}
.item .body{padding:0 14px 10px}
.add{border:1px solid var(--line);background:var(--card);border-radius:99px;padding:6px 11px;font-size:.78rem;font-weight:700;color:var(--brand);flex:none;white-space:nowrap}
.add.in{background:var(--mint-soft);border-color:var(--mint-soft);color:var(--good)}
.tag{display:inline-block;font-size:.72rem;font-weight:700;color:var(--brand);background:var(--mint-soft);border-radius:99px;padding:2px 9px;vertical-align:2px}
.wk{font-family:"Lexend",sans-serif;font-weight:700;margin:20px 0 8px;font-size:1rem}
.more{margin:8px 0 20px}

/* thẻ lật */
.progress{display:flex;align-items:center;gap:10px;margin:0 0 14px;font-size:.88rem;color:var(--muted);font-weight:700}
.progress .prog{flex:1}
.x{border:0;background:none;font-size:1.3rem;color:var(--muted);padding:0 4px}
.flash{perspective:1200px}
.flash .in{position:relative;min-height:440px;transition:transform .45s;transform-style:preserve-3d}
.flash.flipped .in{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--card);border:1px solid var(--line);
  border-radius:28px;padding:22px;display:flex;flex-direction:column;overflow:auto}
.front{align-items:center;justify-content:center;text-align:center;cursor:pointer;background:var(--card)}
.front::before{content:"";position:absolute;top:18px;left:18px;width:14px;height:14px;border-radius:50%;background:var(--sun)}
.back{transform:rotateY(180deg)}
.word{font-family:"Lexend",sans-serif;font-size:2.4rem;font-weight:800;letter-spacing:-.04em;line-height:1.15;margin:14px 0 10px;word-break:break-word}
.hint{color:var(--muted);font-size:.88rem;margin-top:20px}
.say{border:0;background:var(--brand);color:var(--brand-ink);width:48px;height:48px;border-radius:50%;display:inline-grid;place-items:center;flex:none}
.say svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.say.sm{width:34px;height:34px;background:var(--mint-soft);color:var(--brand)}
.say.sm svg{width:16px;height:16px}
.mean{font-size:1.25rem;font-weight:700;margin:4px 0 10px}
.ex{display:flex;align-items:flex-start;gap:10px;padding:9px 0;border-top:1px solid var(--line);font-size:.97rem}
.ex p{margin:0;flex:1;padding-top:5px}
.ex small{display:block;color:var(--muted);font-size:.88rem}
mark{background:var(--sun-soft);color:inherit;border-radius:4px;padding:0 2px;font-weight:700}

/* kiểm tra */
.q{font-family:"Lexend",sans-serif;font-size:1.45rem;font-weight:700;letter-spacing:-.02em;margin:6px 0 4px;line-height:1.35}
.qlab{color:var(--muted);font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.opts{display:grid;gap:10px;margin-top:14px}
.opt{text-align:left;border:1.5px solid var(--line);background:var(--card);border-radius:18px;padding:15px 16px;font-weight:600}
.opt.right{border-color:var(--good);background:var(--mint-soft)}
.opt.wrong{border-color:var(--bad);background:var(--coral-soft)}
.score{font-family:"Lexend",sans-serif;font-size:3.2rem;font-weight:800;text-align:center;margin:6px 0}

/* lịch */
.day{display:flex;gap:12px;padding:10px 0;border-top:1px solid var(--line);align-items:flex-start}
.day:first-of-type{border-top:0}
.day input{width:22px;height:22px;margin-top:2px;accent-color:var(--mint);flex:none}
.day .n{font-weight:700}
.day .d{color:var(--muted);font-size:.88rem}
.day.now{background:var(--mint-soft);margin:0 -20px;padding:10px 20px}
.note{background:var(--sun-soft);border-radius:18px;padding:14px 16px;font-size:.93rem;margin-bottom:14px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px;font-size:.9rem;font-weight:700}
.empty{text-align:center;color:var(--muted);padding:26px 10px}
.empty b{display:block;font-size:2.6rem}
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ink);color:var(--bg);
  padding:10px 16px;border-radius:14px;font-size:.88rem;font-weight:600;z-index:30;max-width:90vw}
@media (min-width:700px){ .hero h1{font-size:2.4rem} h1{font-size:2.4rem} }
.tile .prog{background:var(--line)}

/* ===== Riêng app tiếng Trung: màu đỏ son + vàng, chữ Hán ===== */
:root{ --brand:#8f2d2d; --hero:#7a2626; --mint:#e0a63a; --mint-soft:#fbf0dc; --good:#2f8f6b; --coral:#d9574a; }
:root[data-theme="dark"]{ --brand:#f0b44c; --brand-ink:#1a1210; --hero:#3a1f1d; --mint:#f0b44c; --mint-soft:#3a2d1a; --bg:#15110f; --card:#1f1a17; --line:#3a2f28; --ink:#f3ece6; --muted:#b3a59a; }
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){ --brand:#f0b44c; --brand-ink:#1a1210; --hero:#3a1f1d; --mint:#f0b44c; --mint-soft:#3a2d1a; --bg:#15110f; --card:#1f1a17; --line:#3a2f28; --ink:#f3ece6; --muted:#b3a59a; } }
.zh{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;letter-spacing:0}
.hz{font-family:"Noto Sans SC","PingFang SC",sans-serif;font-size:3.6rem;font-weight:700;line-height:1.1;margin:12px 0 4px;letter-spacing:.04em}
.pyl{color:var(--brand);font-weight:700;font-size:1.25rem}
.nopy .pyl,.nopy .exp{visibility:hidden}
.nopy .exp{display:none}
.round#py{font-family:"Noto Sans SC",sans-serif;font-weight:700}
.round#py.off{opacity:.45;text-decoration:line-through}
.exz{font-family:"Noto Sans SC",sans-serif;font-size:1.12rem}
.exp{display:block;color:var(--brand);font-size:.86rem}
.st-tag{display:inline-block;margin-top:4px;border:1px solid var(--line);border-radius:99px;padding:1px 9px;font-size:.74rem;font-weight:700;color:var(--muted);background:var(--card);cursor:pointer}
.st-tag b{color:var(--brand)}
.st-box{background:var(--mint-soft);border-radius:12px;padding:8px 10px;font-size:.85rem;margin-top:6px}
.writer{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:8px 0}
.writer .cell{width:120px;height:120px;border:1px solid var(--line);border-radius:14px;background:
  linear-gradient(var(--line),var(--line)) center/100% 1px no-repeat,linear-gradient(var(--line),var(--line)) center/1px 100% no-repeat,var(--card)}
.writer.big .cell{width:min(42vw,200px);height:min(42vw,200px)}
.mini{border:1px solid var(--line);background:var(--card);border-radius:99px;padding:6px 12px;font-size:.82rem;font-weight:700;color:var(--brand)}
.struct{border-top:1px solid var(--line);padding:12px 0}
.struct:first-of-type{border-top:0}
.struct .pat{font-family:"Noto Sans SC","Lexend",sans-serif;font-weight:700;font-size:1.05rem}
.struct .num{display:inline-grid;place-items:center;min-width:30px;height:24px;border-radius:8px;background:var(--mint-soft);color:var(--brand);font-weight:800;font-size:.78rem;margin-right:6px}
.typein{font-size:1.1rem;text-align:center}
.flash .in{min-height:min(74vh,640px)}