/* ===== Tiếng Trung Yuxin · HSK1 =====
   Màu, font, hình khối theo design system "Tiếng Trung Yuxin"
   và wireframe BanA_HanhTrinh / KhungGiaoDien. */

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:Inter,system-ui,sans-serif;color:var(--ink);background:var(--tile-line);-webkit-tap-highlight-color:transparent;overflow:hidden}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
a{color:inherit;text-decoration:none}

/* Khung app: luôn dựng ở khổ 340px như wireframe BanA,
   rồi app.js phóng to cả khung cho vừa chiều rộng điện thoại (giữ đúng tỉ lệ). */
#app{position:absolute;top:0;left:0;width:340px;height:100vh;background:var(--page);overflow:hidden;transform-origin:0 0}
.scr{height:100%;display:flex;flex-direction:column;position:relative}
.body{flex:1;overflow-y:auto;padding:12px 14px;position:relative}

/* Chữ */
.hz{font-family:var(--hanzi)}
.B{font-family:"Baloo 2",system-ui,sans-serif;font-weight:800}
.py{color:var(--ink-muted);font-size:13px}
.nopy .py{visibility:hidden}
.ic{width:1em;height:1em;display:inline-block;vertical-align:-.14em}
.sec{font-size:12px;font-weight:700;letter-spacing:.08em;color:var(--ink-muted);text-transform:uppercase;margin:18px 2px 10px}
.grad{background:linear-gradient(170deg,var(--sky),var(--sea) 55%,var(--mint))}

/* Nút */
.btn{display:flex;justify-content:center;align-items:center;gap:6px;height:50px;border-radius:999px;font-family:"Baloo 2",system-ui,sans-serif;font-weight:800;font-size:17px;width:100%;transition:transform .1s}
.btn:active{transform:translateY(3px)}
.pri{background:var(--blue-deep);color:#fff;box-shadow:0 4px 0 var(--ink)}
.wh{background:#fff;color:var(--blue-deep);box-shadow:0 4px 0 var(--blue-deep)}
.cor{background:var(--coral);color:#fff;box-shadow:0 4px 0 var(--coral-ink)}
.mi{background:var(--mint);color:var(--ink);box-shadow:0 4px 0 #3BB596}
.card{background:#fff;color:var(--ink);border-radius:18px;box-shadow:0 6px 18px rgba(30,95,214,.12)}
.tile{background:var(--ivory);border:2px solid var(--tile-line);border-radius:14px;box-shadow:0 3px 0 var(--mint),0 6px 0 var(--blue-deep);display:grid;place-items:center;color:var(--blue-deep)}
.foot{padding:10px 14px calc(16px + env(safe-area-inset-bottom));display:flex;gap:10px}

/* Thanh trên (HUD) */
.hud{display:flex;align-items:center;gap:8px;padding:12px 14px 8px;padding-top:calc(12px + env(safe-area-inset-top))}
.back{width:34px;height:34px;border-radius:50%;background:#fff;display:grid;place-items:center;color:var(--blue-deep);font-weight:800;box-shadow:0 3px 0 var(--tile-line);flex:none;font-size:15px}
.tt{flex:1;font-family:"Baloo 2",system-ui,sans-serif;font-weight:800;font-size:16px;line-height:1.1;min-width:0}
.tt small{display:block;font-family:Inter;font-weight:600;font-size:11px;color:var(--ink-muted)}
.grad .tt{color:#fff;text-shadow:0 2px 0 var(--blue-deep)}
.grad .tt small{color:var(--ink);text-shadow:none}
.pill{display:inline-flex;align-items:center;gap:4px;background:#fff;border-radius:999px;padding:4px 9px;font-weight:800;font-size:13px;box-shadow:0 3px 0 var(--blue-deep);color:var(--ink);flex:none}
.segs{display:flex;gap:4px;flex:1}
.segs i{flex:1;height:8px;border-radius:4px;background:var(--tile-line)}
.segs i.f{background:linear-gradient(90deg,var(--sea),var(--blue-deep))}
.combo{display:inline-flex;align-items:center;gap:4px;background:var(--sunbg);color:#8A5A00;border-radius:999px;padding:4px 9px;font-weight:800;font-size:12px}
.tog{font-size:12px;font-weight:700;color:var(--ink-muted);display:flex;align-items:center;gap:6px;flex:none}
.sw{width:40px;height:24px;border-radius:999px;background:var(--blue-deep);position:relative;display:inline-block;transition:background .2s}
.sw:after{content:"";position:absolute;left:19px;top:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:left .2s}
.nopy .sw{background:#B7C6DC}.nopy .sw:after{left:3px}

/* Thanh tab dưới: luôn nằm ở đáy vì .scr là cột flex, chỉ .body ở giữa được cuộn */
.nav{flex-shrink:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));padding:10px 12px calc(14px + env(safe-area-inset-bottom));background:var(--card);border-top:1px solid var(--tile-line);box-shadow:0 -6px 18px rgba(30,95,214,.08)}
.nav a{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:12px;font-weight:600;color:var(--ink-muted)}
.nav a.on{color:var(--blue-deep);font-weight:700}
.nav .ni{position:relative;display:flex;align-items:center;justify-content:center;width:56px;height:32px;border-radius:999px}
.nav a.on .ni{background:var(--tile-line)}
.nav .badge{position:absolute;top:0;right:8px;min-width:18px;height:18px;padding:0 4px;border-radius:999px;background:var(--coral-ink);color:#fff;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center}

/* Hiệu ứng */
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(255,122,107,.6)}100%{box-shadow:0 0 0 16px rgba(255,122,107,0)}}
@keyframes floatUp{0%{opacity:0;transform:translateY(8px)}20%{opacity:1}100%{opacity:0;transform:translateY(-30px)}}
@keyframes shine{0%,100%{opacity:.55;transform:scale(.94)}50%{opacity:1;transform:scale(1.06)}}
@keyframes drift{0%{transform:translateX(0)}100%{transform:translateX(26px)}}
@keyframes pop{0%{transform:scale(.6);opacity:0}100%{transform:scale(1);opacity:1}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ===== TRANG CHỦ (tab Học) ===== */
.top{display:flex;align-items:center;gap:10px;padding:14px 16px 6px;padding-top:calc(14px + env(safe-area-inset-top))}
.top img{width:42px;height:42px;border-radius:12px}
.top .hi{flex:1}.top .hi small{color:var(--ink-muted);font-size:12px}
.top .hi div{font-family:"Baloo 2",system-ui,sans-serif;font-weight:800;font-size:19px;line-height:1.1}
.hero{background:linear-gradient(135deg,var(--sky),var(--sea) 55%,var(--mint));border-radius:24px;padding:16px;color:#fff;position:relative;overflow:hidden;box-shadow:0 6px 0 var(--blue-deep)}
.hero:after{content:"";position:absolute;right:-30px;top:-30px;width:120px;height:120px;border-radius:50%;background:rgba(255,255,255,.18)}
.hero .t{font-family:"Baloo 2",system-ui,sans-serif;font-weight:800;font-size:24px;text-shadow:0 3px 0 var(--blue-deep)}
.hero .s{font-size:13px;font-weight:600;color:var(--ink);margin:2px 0 10px}
.bar{height:12px;background:rgba(255,255,255,.55);border-radius:999px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--ivory);border-radius:999px}
.les{display:flex;align-items:center;gap:12px;background:#fff;border-radius:20px;padding:10px 12px;margin-bottom:9px;box-shadow:0 6px 18px rgba(30,95,214,.12);width:100%;text-align:left}
.les .tile{width:48px;height:58px;font-size:26px;flex:none;color:var(--ink)}
.les .m{flex:1;min-width:0}
.les .m b{font-family:"Baloo 2",system-ui,sans-serif;font-size:16px;font-weight:800;display:block;line-height:1.2}
.les .m span{font-size:12px;color:var(--ink-muted)}
.les.cur{outline:3px solid var(--coral)}
.les.locked{opacity:.55}
.st{font-size:12px;font-weight:700;border-radius:999px;padding:4px 9px;flex:none}
.st.done{background:#DDF7EF;color:var(--success)}.st.now{background:#FFE6E2;color:var(--coral-ink)}.st.lock{background:#EAF0F8;color:var(--ink-muted)}
.stars{color:var(--sun);font-size:12px;letter-spacing:1px}

/* ===== BẢN ĐỒ BÀI ===== */
.map{flex:1;position:relative;overflow:hidden}
.map-in{position:relative;width:324px;height:440px;margin:0 auto;transform-origin:top center}
.cloud{position:absolute;background:#fff;border-radius:999px;opacity:.75;animation:drift 6s ease-in-out infinite alternate}
.cloud:before,.cloud:after{content:"";position:absolute;background:#fff;border-radius:50%}
.cloud:before{width:26px;height:26px;left:10px;top:-12px}.cloud:after{width:18px;height:18px;left:30px;top:-7px}
.isl{position:absolute;width:96px;height:26px;border-radius:50%;background:#BDF3E3;box-shadow:0 5px 0 #5FC9AC}
.node{position:absolute;width:62px;height:76px;font-size:30px;line-height:1}
.node .nm{position:absolute;bottom:-34px;left:50%;transform:translateX(-50%);white-space:nowrap;font-family:"Baloo 2";font-weight:800;font-size:13px;color:#fff;text-shadow:0 2px 0 var(--blue-deep)}
.node .st2{position:absolute;top:-18px;left:50%;transform:translateX(-50%);color:var(--sun);font-size:13px;white-space:nowrap;filter:drop-shadow(0 1px 0 #B7791F)}
.node.done{background:#EFFFF9}
.node.cur{animation:bob 1.8s ease-in-out infinite;border-color:var(--coral);box-shadow:0 3px 0 var(--mint),0 6px 0 var(--blue-deep),0 0 0 5px rgba(255,122,107,.45)}
.node.lock{background:#E7F0FB;color:#9DB2CF}
.node .lk{position:absolute;right:-8px;top:-8px;width:24px;height:24px;border-radius:50%;background:var(--ink);display:grid;place-items:center}
.robot{position:absolute;width:58px;height:70px;animation:bob 2.4s ease-in-out infinite;pointer-events:none}
.say{position:absolute;background:#fff;color:var(--ink);border-radius:14px;padding:6px 10px;font-size:12px;font-weight:700;box-shadow:0 3px 0 var(--blue-deep);white-space:nowrap;z-index:3;pointer-events:none}
.say:after{content:"";position:absolute;left:14px;bottom:-7px;border:7px solid transparent;border-top-color:#fff;border-bottom:0}
.chest{position:absolute;animation:shine 2.4s ease-in-out infinite}
.sheet{background:#fff;border-radius:26px 26px 0 0;padding:14px 16px calc(16px + env(safe-area-inset-bottom));box-shadow:0 -6px 20px rgba(20,48,107,.18)}
.sheet .k{font-size:11px;font-weight:800;color:var(--coral-ink);letter-spacing:.06em}
.meta{display:flex;gap:6px;margin:8px 0 12px;flex-wrap:wrap}
.meta span{font-size:12px;font-weight:700;background:var(--page);border:1.5px solid var(--tile-line);border-radius:999px;padding:3px 9px}

/* ===== RÚT BÀI ===== */
.deck{position:relative;width:236px;height:316px;margin:18px auto 0;perspective:900px;cursor:pointer}
.deck .ghost{position:absolute;inset:0;border-radius:26px;background:var(--ivory);border:2px solid var(--tile-line);box-shadow:0 4px 0 var(--mint),0 8px 0 var(--blue-deep)}
.flip{position:absolute;inset:0;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.3,1.4,.5,1)}
.deck.on .flip{transform:rotateY(180deg)}
.face{position:absolute;inset:0;border-radius:26px;background:var(--ivory);border:3px solid #fff;box-shadow:0 5px 0 var(--mint),0 10px 0 var(--blue-deep),0 18px 30px rgba(20,48,107,.22);backface-visibility:hidden;-webkit-backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:22px 18px;text-align:center}
.face:before{content:"";position:absolute;inset:9px;border:3px solid var(--tile-line);border-radius:19px;pointer-events:none}
.face.rev{transform:rotateY(180deg)}
/* Safari không ẩn mặt sau đúng khi khung app đang được phóng (scale),
   nên tự ẩn mặt không nhìn thấy, đổi ở giữa lúc lật (sau 0.18s) */
.face{transition:visibility 0s linear .18s}
.deck:not(.on) .face.rev,.deck.on .face:not(.rev){visibility:hidden}
.face .big{font-size:84px;line-height:1.05;color:var(--ink)}
.face .big.long{font-size:60px}
.wt{position:absolute;top:20px;left:20px;font-size:11px;font-weight:700;background:#E3EEFF;color:var(--blue-deep);border-radius:999px;padding:3px 9px}
.cnr{position:absolute;bottom:18px;right:22px;font-size:20px;color:var(--coral-ink)}
.hint{position:absolute;bottom:20px;left:0;right:0;text-align:center;font-size:11px;color:var(--ink-muted);font-weight:600}
.pic{width:96px;height:64px;border-radius:12px;background:#E3EEFF;display:grid;place-items:center;font-size:40px;color:#9DB2CF;box-shadow:0 3px 0 var(--tile-line)}
.pic img{width:100%;height:100%;object-fit:cover;border-radius:12px}
.exm{margin-top:10px;padding:4px 6px;border-radius:10px}
.exm:active{background:#E3EEFF}
.aud{display:flex;justify-content:center;align-items:center;gap:12px;margin:26px 0 0}
.ab{width:52px;height:52px;border-radius:50%;background:#fff;display:grid;place-items:center;box-shadow:0 4px 0 var(--blue-deep);color:var(--blue-deep);font-weight:800;font-size:13px}
.ab.main{width:62px;height:62px;background:var(--blue-deep);box-shadow:0 4px 0 var(--ink);color:#fff}
.ab.rec{background:var(--coral);color:#fff;box-shadow:0 4px 0 var(--coral-ink);animation:pulse 1.4s infinite}
.ab:active{transform:translateY(3px)}
.xp{position:absolute;right:30px;top:90px;font-family:"Baloo 2";font-weight:800;color:var(--success);font-size:18px;opacity:0;pointer-events:none}
.xp.go{animation:floatUp 1.2s ease-out}

/* ===== KẾT THÚC CHẶNG ===== */
.done-wrap{flex:1;overflow-y:auto;padding:24px 18px 10px;text-align:center}
.done-wrap .bigstar{display:flex;justify-content:center;gap:6px;margin:6px 0 4px}
.done-wrap .bigstar svg{width:42px;height:42px;animation:pop .4s ease-out both}
.done-wrap .bigstar svg.off{opacity:.25;filter:grayscale(1)}
.rw{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--tile-line);font-size:14px}
.rw:last-child{border:0}
.rw b{font-family:"Baloo 2";font-weight:800;font-size:16px;color:var(--success)}
.chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.chips .tile{min-width:58px;height:66px;padding:0 10px;flex-direction:column;font-size:24px;line-height:1.1;color:var(--ink)}
.chips .tile small{font-family:Inter;font-size:10.5px;color:var(--ink-muted)}

/* ===== TAB PHỤ ===== */
.wrow{display:flex;align-items:center;gap:12px;padding:10px 12px;border-bottom:1px solid var(--tile-line);width:100%;text-align:left}
.wrow:last-child{border:0}
.wrow .hz{font-size:28px;min-width:64px;color:var(--ink)}
.wrow .m{flex:1}.wrow .m b{display:block;font-size:14px}
.wrow .m small{color:var(--ink-muted);font-size:12.5px}
.wrow .spk{width:36px;height:36px;border-radius:50%;background:#E3EEFF;display:grid;place-items:center;color:var(--blue-deep);flex:none}
.stat{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.stat div{background:#fff;border-radius:18px;padding:12px 6px;text-align:center;box-shadow:0 4px 0 var(--tile-line)}
.stat b{display:block;font-family:"Baloo 2";font-weight:800;font-size:24px;line-height:1.1}
.stat small{font-size:12px;color:var(--ink-muted);font-weight:600}
.cells{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin-top:8px}
.cell{border-radius:12px;background:var(--page);color:#9DB2CF;display:flex;flex-direction:column;align-items:center;padding:6px 0;font-family:var(--hanzi);font-size:22px;line-height:1.1}
.cell small{font-family:Inter;font-size:10px;font-weight:600;color:var(--ink-muted);margin-top:2px}
.cell.on{background:#DDF7EF;color:var(--success)}
.cell.on small{color:#B7791F;letter-spacing:1px}
.empty{display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px;padding:30px 20px;color:var(--ink-muted);font-size:14px}

/* Toast + màn chặn Zalo */
.toast{position:absolute;left:50%;bottom:96px;transform:translateX(-50%);background:var(--ink);color:#fff;font-size:14px;font-weight:600;padding:10px 16px;border-radius:999px;z-index:50;max-width:90%;text-align:center;animation:pop .2s ease-out}
.block{position:absolute;inset:0;z-index:100;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:30px;text-align:center;color:var(--ink)}
.block .card{padding:18px;text-align:left;font-size:14px;line-height:1.6}
.dev{font-size:12px;color:var(--ink-muted);text-decoration:underline;margin-top:6px}