:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--bg:#f7f5f0;--bg-elevated:#fff;--text:#1c1a17;--text-dim:#6b6459;--border:#ddd6c9;--accent:#8a5a2b;--accent-text:#fff;--danger:#b3261e;--danger-bg:#fbe9e7;--success:#357a38;--success-bg:#e8f3e9;--warning:#9a6a00;--warning-bg:#fbf1dc;--kim:#7c8591;--moc:#2e7d32;--thuy:#1565c0;--hoa:#c62828;--tho:#b3620a;--hao-duong:var(--text);--hao-am-gap:var(--bg);font-family:Segoe UI,system-ui,-apple-system,Noto Sans,sans-serif}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}:root:not([data-theme=light]){--bg:#1b1815;--bg-elevated:#262220;--text:#ede8e0;--text-dim:#a89f90;--border:#423c34;--accent:#d19a5c;--accent-text:#1b1815;--danger:#ff6b60;--danger-bg:#3a2220;--success:#7fc687;--success-bg:#1e2e1f;--warning:#e0b355;--warning-bg:#332912;--kim:#a7b0bc;--moc:#6cbf6f;--thuy:#6ea8ea;--hoa:#ef6b64;--tho:#e0a355}}*{box-sizing:border-box}html,body{margin:0;padding:0}html{font-size:106.25%}body{background:var(--bg);color:var(--text)}#root{flex-direction:column;min-height:100vh;display:flex}h1,h2,h3{margin:0 0 .5em;font-weight:600}button{font:inherit;cursor:pointer}input,select{font:inherit}.mau-kim{color:var(--kim)}.mau-moc{color:var(--moc)}.mau-thuy{color:var(--thuy)}.mau-hoa{color:var(--hoa)}.mau-tho{color:var(--tho)}@media print{.khong-in{display:none!important}}.app-shell{flex-direction:column;flex:1;width:100%;max-width:1200px;margin:0 auto;padding:0 16px 32px;display:flex}.app-header{flex-wrap:wrap;justify-content:flex-start;align-items:baseline;gap:8px;padding:20px 0 12px;display:flex}.app-header h1{color:#5c3d2e;margin:0;font-size:1.4rem}.app-slogan{color:#8a7a6a;margin-left:18px;font-size:15px;font-weight:400;display:none}@media (width>=768px){.app-slogan{display:inline}}.app-nav{border-bottom:1px solid var(--border);flex-wrap:wrap;gap:4px;margin-bottom:20px;display:flex}.app-nav a{color:var(--text-dim);background:0 0;border:none;border-bottom:2px solid #0000;padding:10px 14px;font-size:.95rem;text-decoration:none}.app-nav a.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}.the{background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;margin-bottom:16px;padding:16px 18px}.the h2{color:var(--text-dim);text-transform:uppercase;letter-spacing:.03em;font-size:.8rem}.hang-form{flex-wrap:wrap;align-items:flex-end;gap:12px;display:flex}.truong{flex-direction:column;gap:4px;display:flex}.truong label{color:var(--text-dim);font-size:.8rem}.truong input,.truong select{border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:6px;padding:6px 8px}.nut{border:1px solid var(--accent);background:var(--accent);color:var(--accent-text);font-weight:600;font-size:inherit;text-align:center;border-radius:6px;padding:7px 16px;line-height:normal;text-decoration:none;display:inline-block}.nut.phu{color:var(--accent);background:0 0}.nut.nguy-hiem{border-color:var(--danger);color:var(--danger);background:0 0}.nut:disabled{opacity:.5;cursor:not-allowed}.hang-chip{flex-wrap:wrap;gap:8px;display:flex}.chip-loc{border:1px solid var(--border);color:var(--text-dim);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:6px;padding:5px 12px;font-size:.78rem;font-weight:600;line-height:1.3;display:inline-flex}.chip-loc-cham{border:1px solid;border-radius:50%;flex:none;width:6px;height:6px}.chip-loc.dang-hien{border-color:var(--accent);color:var(--accent)}.chip-loc.dang-hien .chip-loc-cham{background:var(--accent)}.luoi-can-chi{text-align:center;grid-template-columns:repeat(4,1fr);gap:10px;display:grid}.luoi-can-chi .o{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px 4px}.luoi-can-chi .nhan{color:var(--text-dim);font-size:.72rem;display:block}.luoi-can-chi .gia-tri{font-size:1.05rem;font-weight:600}.que-dich-view{flex-wrap:wrap;gap:24px;display:flex}.que-dich-cot{flex:1;min-width:260px}.que-dich-ten{margin-bottom:2px;font-size:1.1rem;font-weight:700}.que-dich-cung{color:var(--text-dim);margin-bottom:10px;font-size:.85rem}.hao-hang{border-bottom:1px dashed var(--border);align-items:center;gap:10px;padding:5px 0;display:flex}.hover-boc{display:inline-block;position:relative}.que-dich-ten-link{font:inherit;font-weight:inherit;color:inherit;cursor:pointer;-webkit-text-decoration:underline dotted var(--text-dim);text-decoration:underline dotted var(--text-dim);text-underline-offset:3px;background:0 0;border:none;margin:0;padding:0}.que-dich-ten-link:hover{color:var(--accent);-webkit-text-decoration-color:var(--accent);text-decoration-color:var(--accent)}.hover-trigger{cursor:help;-webkit-text-decoration:underline dotted var(--text-dim);text-decoration:underline dotted var(--text-dim);text-underline-offset:3px}.hover-bang{z-index:30;background:var(--bg-elevated);border:1px solid var(--border);white-space:pre-wrap;color:var(--text);border-radius:8px;padding:12px 14px;font-size:.85rem;line-height:1.55;position:fixed;overflow-y:auto;box-shadow:0 8px 24px #0000002e}.hover-bang h4{text-transform:uppercase;letter-spacing:.03em;color:var(--text-dim);margin:0 0 6px;font-size:.78rem}.hover-bang p{margin:0 0 10px}.hover-bang p:last-child{margin-bottom:0}.hao-hang:last-child{border-bottom:none}.hao-vach{flex-shrink:0;gap:6px;width:46px;height:12px;display:flex}.hao-vach .thanh{background:var(--hao-duong);border-radius:2px;flex:1;height:100%}.hao-hang.dong .hao-vach .thanh{background:var(--danger)}.hao-nhan{flex:1;font-size:.9rem}.hao-nhan .huy-hieu{border:1px solid;border-radius:10px;margin-left:6px;padding:1px 6px;font-size:.72rem}.hao-than{color:var(--text-dim);text-align:right;flex-shrink:0;width:44px;font-size:.75rem}.diem-luc-than{grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;margin-top:8px;display:grid}.diem-luc-than .o{text-align:center;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px 4px}.diem-luc-than .nhan{color:var(--text-dim);font-size:.75rem;display:block}.diem-luc-than .diem{font-size:1.15rem;font-weight:700}.giai-thich{white-space:pre-wrap;max-width:720px;font-size:.92rem;line-height:1.6}.han-tu{white-space:pre-wrap;max-width:720px;color:var(--text-dim);font-size:.92rem;font-style:italic;line-height:1.7}table.bang-ket-qua{border-collapse:collapse;width:100%;font-size:.88rem}table.bang-ket-qua th,table.bang-ket-qua td{border-bottom:1px solid var(--border);text-align:left;white-space:nowrap;padding:6px 8px}table.bang-ket-qua th{color:var(--text-dim);text-transform:uppercase;font-size:.78rem;font-weight:600}.bang-ket-qua-boc{overflow-x:auto}.thanh-tien-do{background:var(--border);border-radius:3px;height:6px;margin:10px 0;overflow:hidden}.thanh-tien-do .lap{background:var(--accent);height:100%;transition:width .15s}.danh-sach-luu{flex-direction:column;gap:8px;display:flex}.dong-luu{border:1px solid var(--border);background:var(--bg);border-radius:8px;align-items:center;gap:10px;padding:8px 10px;display:flex}.dong-luu .thoi-diem{white-space:nowrap;font-weight:600}.dong-luu .binh-chu{color:var(--text-dim);text-overflow:ellipsis;flex:1;overflow:hidden}.trong-rong{color:var(--text-dim);text-align:center;padding:20px 0;font-style:italic}@media (width<=560px){.luoi-can-chi{grid-template-columns:repeat(2,1fr)}}.hinh-que{flex-direction:column;flex-shrink:0;gap:4px;display:flex}.hinh-que .hao-vach{width:46px}.hinh-que.gon .hao-vach{width:28px;height:6px}.luoi-64-que{grid-template-columns:repeat(8,1fr);gap:8px;display:grid}.the-que-hover-boc{display:block}.the-que-hover-trigger{cursor:pointer;text-decoration:none;display:block}.the-que{box-sizing:border-box;border:1px solid var(--border);background:var(--bg);width:100%;color:var(--text);text-align:center;border-radius:8px;flex-direction:column;align-items:center;gap:6px;padding:8px 4px;text-decoration:none;display:flex}.the-que:hover{border-color:var(--accent)}.the-que-so{color:var(--text-dim);font-size:.65rem}.the-que-ten{font-size:.72rem;font-weight:600;line-height:1.25}.hao-tu-chi-tiet{border-bottom:1px dashed var(--border);padding:10px 0}.hao-tu-chi-tiet:last-child{border-bottom:none}.hao-tu-chi-tiet h3{color:var(--accent);margin:0 0 4px;font-size:.9rem}@media (width<=760px){.luoi-64-que{grid-template-columns:repeat(4,1fr)}}@media (width<=420px){.luoi-64-que{grid-template-columns:repeat(2,1fr)}}.loai-que-radio{gap:18px}.loai-que-radio label{align-items:center;gap:6px;font-size:.92rem;display:flex}.hero-ket-qua{border:1px solid var(--accent)}.hero-nhan{letter-spacing:.06em;text-transform:uppercase;color:var(--text-dim);margin-bottom:8px;font-size:.75rem;font-weight:700}.hero-que{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:10px;display:flex}.hero-que-ten{font-size:1.4rem;font-weight:700}.hero-que-bien{color:var(--text-dim)}.hero-mui-ten{color:var(--text-dim);font-size:1.1rem}.hero-badge{border-radius:999px;margin-bottom:10px;padding:4px 12px;font-size:.85rem;font-weight:700;display:inline-block}.hero-badge-thuan{background:var(--success-bg);color:var(--success)}.hero-badge-trungTinh{background:var(--warning-bg);color:var(--warning)}.hero-badge-canThanTrong{background:var(--danger-bg);color:var(--danger)}.hero-tom-tat{max-width:720px;margin-bottom:14px;line-height:1.6}.hero-diem-hai-cot{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;display:grid}.hero-diem-tieu-de{text-transform:uppercase;letter-spacing:.03em;margin:0 0 6px;font-size:.78rem}.hero-diem-tieu-de.thuan{color:var(--success)}.hero-diem-tieu-de.can-luu-y{color:var(--danger)}.hero-diem-list{margin:0;padding-left:18px;font-size:.9rem;line-height:1.6}.hero-diem-rong{color:var(--text-dim);font-size:.88rem;font-style:italic}.luan-que-tieu-de{text-transform:uppercase;letter-spacing:.04em;color:var(--text-dim);margin:18px 0 6px;font-size:.8rem}.luan-que-tieu-de:first-of-type{margin-top:0}.hao-dong-dien-bien{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.can-cu summary{cursor:pointer;padding:4px 0;font-weight:600}.can-cu-noi-dung{flex-direction:column;gap:6px;margin-top:10px;display:flex}.can-cu-dong{gap:10px;font-size:.9rem;display:flex}.can-cu-nhan{width:140px;color:var(--text-dim);flex-shrink:0}.vuong-suy-boc{flex-direction:column;gap:8px;display:flex}.vuong-suy-hang{align-items:center;gap:10px;font-size:.88rem;display:flex}.vuong-suy-nhan{flex-shrink:0;width:90px}.vuong-suy-truc{background:var(--border);border-radius:5px;flex:1;height:10px;position:relative}.vuong-suy-truc .mid{background:var(--text-dim);width:1px;position:absolute;top:-3px;bottom:-3px;left:50%}.vuong-suy-thanh{border-radius:5px;position:absolute;top:0;bottom:0}.vuong-suy-thanh.duong{background:var(--success)}.vuong-suy-thanh.am{background:var(--danger)}.vuong-suy-diem{text-align:right;flex-shrink:0;width:32px;font-weight:700}.ghi-chu-vuong-suy{color:var(--text-dim);max-width:720px;margin-top:10px;font-size:.82rem}.thuat-ngu-icon{color:var(--text-dim);margin-left:2px;font-size:.75em}.chu-giai{color:var(--text-dim);flex-wrap:wrap;gap:16px;margin-bottom:14px;font-size:.82rem;display:flex}.chu-giai-muc{align-items:center;gap:6px;display:flex}.hao-vach.mau-chu-giai{width:28px;height:8px}.cham-mau{border-radius:50%;width:10px;height:10px;display:inline-block}.hanh-dong{flex-wrap:wrap;align-items:flex-end;gap:10px;display:flex}.nut-nho{color:var(--text-dim);background:0 0;border:none;padding:6px 4px;font-size:.85rem;text-decoration:underline}@media (width<=640px){.hero-que{flex-direction:column;align-items:flex-start}.can-cu-dong{flex-direction:column;gap:2px}.can-cu-nhan{width:auto}}.coin-mode-grid{grid-template-columns:1fr;gap:12px;margin:16px 0;display:grid}.coin-mode-card{text-align:left;border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:10px;flex-direction:column;gap:6px;padding:16px;display:flex}.coin-mode-card:hover{border-color:var(--accent)}.coin-mode-card.active{border-color:var(--accent);background:var(--bg-elevated);border-width:2px}.coin-mode-card:disabled{opacity:.5;cursor:not-allowed}.coin-mode-card:disabled:hover{border-color:var(--border)}.coin-mode-card span{color:var(--text-dim);font-size:.9rem}.coin-row{justify-content:center;gap:18px;margin-bottom:16px;font-size:1.3rem;font-weight:600;display:flex}.coin-face{border:1px solid var(--border);background:var(--bg-elevated);border-radius:8px;min-width:64px;padding:10px 6px}.coin-select-grid{grid-template-columns:repeat(3,1fr);gap:12px;margin-top:12px;display:grid}.coin-select-col{flex-direction:column;align-items:center;gap:6px;display:flex}.coin-select-btn{border:1px solid var(--accent);width:100%;color:var(--accent);background:0 0;border-radius:6px;padding:7px 16px;font-weight:600}.coin-select-btn.active{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}@media (width>=600px){.coin-mode-grid{grid-template-columns:1fr 1fr}}@font-face{font-family:EB Garamond;font-style:normal;font-weight:400 800;font-display:swap;src:url(/fonts/eb-garamond-latin-ext-normal-400_800.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:EB Garamond;font-style:normal;font-weight:400 800;font-display:swap;src:url(/fonts/eb-garamond-latin-normal-400_800.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:EB Garamond;font-style:normal;font-weight:400 800;font-display:swap;src:url(/fonts/eb-garamond-vietnamese-normal-400_800.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:EB Garamond;font-style:italic;font-weight:400 800;font-display:swap;src:url(/fonts/eb-garamond-latin-ext-italic-400_800.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:EB Garamond;font-style:italic;font-weight:400 800;font-display:swap;src:url(/fonts/eb-garamond-latin-italic-400_800.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:EB Garamond;font-style:italic;font-weight:400 800;font-display:swap;src:url(/fonts/eb-garamond-vietnamese-italic-400_800.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}.theme-stitch{--bg:#fff9ed;--bg-elevated:#f4ebd0;--text:#1a1a1a;--text-dim:#4a4a4a;--border:#4a4a4a47;--accent:#a12d2e;--accent-text:#fff;--success:#a12d2e;--success-bg:#a12d2e0f;--warning:#745b00;--warning-bg:#c5a0211f;--danger:#80141a;--danger-bg:#80141a14;--hao-duong:var(--text);--hao-am-gap:var(--bg);color:var(--text);background-color:var(--bg);background-image:radial-gradient(circle at 20% 20%,#c5a02112 0,#0000 30%),radial-gradient(circle at 80% 5%,#a12d2e0f 0,#0000 26%);padding:4px 0 8px;font-family:EB Garamond,Times New Roman,serif}.theme-stitch .the{border-color:var(--border);border-radius:0;position:relative;box-shadow:inset 0 1px 8px #1a1a1a12}.theme-stitch .the:before,.theme-stitch .the:after{content:"";border:1px solid var(--text-dim);pointer-events:none;width:12px;height:12px;position:absolute}.theme-stitch .the:before{border-bottom:none;border-right:none;top:4px;left:4px}.theme-stitch .the:after{border-top:none;border-left:none;bottom:4px;right:4px}.theme-stitch .the h2{letter-spacing:.13em;color:var(--text);border-bottom:1px solid #4a4a4a26;margin-bottom:18px;padding-bottom:8px;font-size:.8rem}.theme-stitch .truong label{letter-spacing:.04em}.theme-stitch .truong input,.theme-stitch .truong select{background:0 0;border:0;border-bottom:1px solid #4a4a4a80;border-radius:0;padding:8px 0}.theme-stitch .truong input:focus,.theme-stitch .truong select:focus{border-bottom-color:var(--accent);outline:none}.theme-stitch input[type=radio]{accent-color:var(--accent)}.theme-stitch .nut{text-transform:uppercase;letter-spacing:.06em;border:0;border-radius:0;padding:12px 18px}.theme-stitch .nut.phu{border:1px solid var(--accent);color:var(--accent);background:0 0}.theme-stitch .hero-badge{border:1px solid;border-radius:2px}.theme-stitch .hero-badge-canThanTrong{background:var(--danger);color:#fff}.theme-stitch .vuong-suy-thanh.am{background:var(--text-dim)}.theme-stitch .luoi-can-chi .o{border-color:var(--border);border-radius:0}.theme-stitch .the-que,.theme-stitch .dong-luu,.theme-stitch .diem-luc-than .o,.theme-stitch .hoc-ghi-nho,.theme-stitch .selection-box,.theme-stitch .card-count,.theme-stitch .stat-item,.theme-stitch .jump-control,.theme-stitch .debug-info,.theme-stitch .debug-info pre,.theme-stitch .finish-message,.theme-stitch .que-grid,.theme-stitch .grid-button,.theme-stitch .learn-card,.theme-stitch .card-body,.theme-stitch .hexagram-display{border-radius:0}.hexagram-display{background:var(--bg);border:1px solid var(--border);border-radius:8px;flex-direction:column;align-items:center;gap:1rem;padding:1.5rem;display:flex}.hexagram-title{color:var(--text-dim);letter-spacing:1px;text-transform:uppercase;font-size:.95rem;font-weight:600}.hexagram-display .hinh-que{gap:8px}.hexagram-display .hinh-que .hao-vach{width:90px;height:8px}@media (width<=640px){.hexagram-display{padding:1rem}.hexagram-display .hinh-que .hao-vach{width:64px;height:6px}}.learn-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:1rem;max-width:600px;margin:0 auto;padding:1.5rem;display:flex}.card-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding-bottom:1rem;display:flex}.card-title{color:var(--text);margin:0;font-size:1.25rem;font-weight:600}.card-counter{color:var(--text-dim);font-size:.875rem;font-weight:500}.difficulty-selector{justify-content:center;gap:.5rem;display:flex}.difficulty-btn{border:1px solid var(--border);cursor:pointer;color:var(--text-dim);background:0 0;border-radius:999px;padding:.5rem 1rem;font-size:.875rem;font-weight:600;transition:all .2s}.difficulty-btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.difficulty-btn.active{border-color:var(--accent);background:var(--accent);color:var(--accent-text)}.difficulty-btn:disabled{opacity:.6;cursor:not-allowed}.card-body{background:var(--bg);border:1px solid var(--border);cursor:pointer;border-radius:8px;flex-direction:column;justify-content:center;align-items:center;min-height:200px;padding:1.5rem;transition:all .3s;display:flex;position:relative}.card-body:hover:not(.feedback-shown){border-color:var(--accent)}.flip-hint{color:var(--text-dim);text-align:center;font-size:1rem;animation:2s infinite pulse}@keyframes pulse{0%,to{opacity:.6}50%{opacity:1}}.card-content-easy{text-align:center;flex-direction:column;gap:1rem;width:100%;display:flex}.card-content-easy .dichviet{color:var(--text);letter-spacing:.5px;font-size:1.125rem;font-weight:600}.card-content-easy .dichgiang{color:var(--text-dim);text-align:left;max-height:150px;padding:0 .5rem;font-size:.95rem;line-height:1.6;overflow-y:auto}.card-content-medium{text-align:center;flex-direction:column;gap:1.25rem;width:100%;display:flex}.card-content-medium .hantu{color:var(--accent);letter-spacing:2px;font-family:Noto Serif SC,SimSun,serif;font-size:2rem;font-weight:700}.card-content-medium .dichviet{color:var(--text-dim);letter-spacing:.3px;font-size:1rem;font-weight:500}.card-content-medium .dichgiang{color:var(--text-dim);text-align:left;background:var(--bg-elevated);border-radius:4px;max-height:120px;padding:.75rem;font-size:.875rem;line-height:1.5;overflow-y:auto}.card-content-hard{justify-content:center;align-items:center;width:100%;display:flex}.card-content-hard .hantu-large{color:var(--accent);letter-spacing:3px;font-family:Noto Serif SC,SimSun,serif;font-size:4rem;font-weight:700}.feedback-message{color:var(--success);font-size:1.25rem;font-weight:600;animation:.4s slideUp}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.review-buttons{justify-content:center;gap:1rem;display:flex}.review-btn{flex:1;max-width:150px;font-size:1rem}.learn-card .review-btn.forget{border-color:var(--danger);color:var(--danger)}.learn-card .review-btn.forget:hover{background:var(--danger-bg)}.learn-card .review-btn.remember{border-color:var(--success);color:var(--success)}.learn-card .review-btn.remember:hover{background:var(--success-bg)}.card-content-easy .dichgiang::-webkit-scrollbar{width:4px}.card-content-medium .dichgiang::-webkit-scrollbar{width:4px}.card-content-easy .dichgiang::-webkit-scrollbar-track{background:0 0}.card-content-medium .dichgiang::-webkit-scrollbar-track{background:0 0}.card-content-easy .dichgiang::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.card-content-medium .dichgiang::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.card-content-easy .dichgiang::-webkit-scrollbar-thumb:hover{background:var(--text-dim)}.card-content-medium .dichgiang::-webkit-scrollbar-thumb:hover{background:var(--text-dim)}@media (width<=640px){.learn-card{max-width:100%;padding:1rem}.card-title{font-size:1.1rem}.card-body{min-height:150px;padding:1rem}.card-content-hard .hantu-large{font-size:2.5rem}.review-buttons{gap:.5rem}.review-btn{max-width:none}.difficulty-selector{flex-wrap:wrap}.difficulty-btn{flex:1;min-width:80px}}@media (prefers-reduced-motion:reduce){.card-body,.difficulty-btn,.review-btn,.flip-hint{transition:none!important;animation:none!important}}.que-selection-grid{flex-direction:column;gap:1.5rem;display:flex}.quick-actions{flex-wrap:wrap;justify-content:center;gap:.75rem;display:flex}.quick-btn{white-space:nowrap;padding:.6rem 1.2rem;font-size:.9rem}.que-selection-grid .quick-btn.random{border-color:var(--warning);color:var(--warning)}.que-selection-grid .quick-btn.all{border-color:var(--success);color:var(--success)}.que-selection-grid .quick-btn.clear{border-color:var(--danger);color:var(--danger)}.grid-container{justify-content:center;padding:1rem 0;display:flex}.que-grid{background:var(--bg);border:1px solid var(--border);border-radius:12px;grid-template-columns:repeat(8,1fr);grid-auto-rows:auto;gap:.75rem;width:100%;padding:1rem;display:grid}.grid-item{display:flex}.grid-button-hover-boc,.grid-button-hover-trigger{width:100%;text-decoration:none;display:block}.grid-button{border:1px solid var(--border);background:var(--bg);cursor:pointer;width:100%;min-height:100px;color:var(--text);border-radius:8px;flex-direction:column;justify-content:space-between;align-items:center;gap:3px;padding:6px;font-size:.85rem;font-weight:600;transition:all .2s;display:flex}.grid-button:hover{border-color:var(--accent)}.grid-button.selected{border-color:var(--accent);background:var(--bg-elevated)}.grid-button.selected:hover{border-color:var(--accent)}.grid-number{color:var(--text-dim);font-size:1rem;font-weight:700}.grid-name{color:var(--text);text-align:center;font-size:.7rem;line-height:1.2}.grid-button.selected .grid-name{color:var(--accent);font-weight:600}.selection-stats{text-align:center;background:var(--bg);border:1px solid var(--accent);border-radius:8px;padding:1rem}.selection-stats .stat-label{color:var(--text-dim);font-size:.95rem;font-weight:600}.selection-stats .stat-value{color:var(--accent);margin-left:.5rem;font-size:1.2rem;font-weight:700}@media (width<=1024px){.que-grid{gap:.6rem;padding:.8rem}.grid-button{min-height:85px;font-size:.8rem}.grid-number{font-size:.95rem}.grid-name{font-size:.65rem}}@media (width<=768px){.que-grid{grid-template-columns:repeat(8,1fr);gap:.5rem;padding:.6rem}.grid-button{gap:2px;min-height:70px;font-size:.7rem}.grid-number{font-size:.85rem}.grid-name{font-size:.6rem}.quick-actions{gap:.5rem}.quick-btn{padding:.5rem 1rem;font-size:.85rem}}@media (width<=640px){.que-grid{grid-template-columns:repeat(4,1fr);gap:.4rem;padding:.5rem}.grid-button{gap:2px;min-height:55px;padding:4px;font-size:.65rem}.grid-number{font-size:.75rem}.grid-name{font-size:.55rem}.quick-actions{flex-direction:column;gap:.5rem}.quick-btn{width:100%;padding:.6rem 1rem;font-size:.9rem}.selection-stats .stat-value{font-size:1.1rem}}.hoc-ghi-nho{background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;max-width:800px;margin:0 auto;padding:20px 18px 28px}.hoc-ghi-nho.selection-screen{flex-direction:column;justify-content:center;display:flex}.content-type-selection{margin-bottom:2rem}.content-type-selection h3{color:var(--text);margin-bottom:1rem;font-size:1.1rem;font-weight:600}.que-selection{margin-bottom:2rem}.que-selection h3{color:var(--text);margin-bottom:1rem;font-size:1.1rem;font-weight:600}.selection-container{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem;margin:1rem 0;display:grid}.selection-box{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:1.1rem 1.25rem;transition:all .2s}.selection-box:hover{border-color:var(--accent)}.checkbox-label{cursor:pointer;-webkit-user-select:none;user-select:none;align-items:flex-start;gap:1rem;display:flex}.checkbox-label input[type=checkbox]{cursor:pointer;width:24px;min-width:24px;height:24px;accent-color:var(--accent);margin-top:2px}.checkbox-text{flex-direction:column;gap:.25rem;display:flex}.checkbox-text strong{color:var(--text);font-size:1.1rem;display:block}.checkbox-text em{color:var(--text-dim);font-size:.9rem;font-style:italic;display:block}.card-count{text-align:center;background:var(--bg);border:1px solid var(--accent);border-radius:8px;margin:1rem 0;padding:1.5rem}.card-count p{color:var(--accent);margin:0;font-size:1.25rem;font-weight:600}.start-button{width:100%;margin:1rem 0;padding:1rem 2rem;font-size:1.1rem;display:block}.reset-button{margin-top:1rem;padding:.75rem 1.5rem;font-size:1rem}.hnh-header{text-align:center;border-bottom:1px solid var(--border);margin-bottom:2rem;padding-bottom:1.5rem}.hnh-header h1{color:var(--text);margin:0 0 .5rem;font-size:2rem;font-weight:700}.hnh-header .subtitle{color:var(--text-dim);margin:0;font-size:1rem;font-weight:500}.stats-bar{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1rem;margin-bottom:1.5rem;display:grid}.stat-item{background:var(--bg);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:6px;flex-direction:column;gap:.25rem;padding:1rem;display:flex}.stat-label{text-transform:uppercase;color:var(--text-dim);letter-spacing:.5px;font-size:.75rem;font-weight:600}.stat-value{color:var(--text);font-size:1.5rem;font-weight:700}.stat-value.remember{color:var(--success)}.stat-value.forget{color:var(--danger)}.progress-container{background:var(--border);border-radius:3px;width:100%;height:6px;margin-bottom:2rem;overflow:hidden}.progress-bar{background:var(--accent);border-radius:3px;height:100%;transition:width .3s}.card-container{margin-bottom:2rem}.navigation-buttons{justify-content:center;align-items:center;gap:1rem;margin-bottom:2rem;display:flex}.nav-btn{flex:1;max-width:140px;font-size:.95rem}.hoc-ghi-nho .nav-btn.prev{border-color:var(--text-dim);color:var(--text-dim)}.hoc-ghi-nho .nav-btn.next{border-color:var(--success);color:var(--success)}.jump-control{background:var(--bg);border:1px solid var(--border);border-radius:6px;align-items:center;gap:.5rem;padding:.5rem 1rem;display:flex}.jump-input{width:50px;color:var(--text);text-align:center;background:0 0;border:none;outline:none;font-size:.95rem;font-weight:600}.jump-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.jump-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.jump-label{color:var(--text-dim);font-size:.875rem;font-weight:500}.session-control{flex-wrap:wrap;justify-content:center;gap:1rem;margin-bottom:2rem;display:flex}.restart-btn,.change-content-btn{padding:.75rem 1.5rem;font-size:.95rem}.hoc-ghi-nho .restart-btn{border-color:var(--warning);color:var(--warning)}.hoc-ghi-nho .change-content-btn{border-color:var(--accent);color:var(--accent)}.finish-message{text-align:center;background:var(--success-bg);border:1px solid var(--success);border-radius:8px;margin-top:2rem;padding:2rem;animation:.5s slideIn}.finish-message h2{color:var(--success);margin:0 0 1rem;font-size:1.75rem}.finish-message p{color:var(--text);margin:.5rem 0;font-size:1.1rem}.finish-message .accuracy{color:var(--success);margin-top:1rem;font-size:1.25rem}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.debug-info{background:var(--bg);border:1px dashed var(--border);border-radius:8px;margin-top:2rem;padding:1rem}.debug-info summary{cursor:pointer;color:var(--text-dim);-webkit-user-select:none;user-select:none;font-size:.875rem;font-weight:600}.debug-info summary:hover{color:var(--text)}.debug-info pre{background:var(--bg-elevated);border:1px solid var(--border);color:var(--text);border-radius:4px;margin:1rem 0 0;padding:1rem;font-size:.75rem;line-height:1.4;overflow-x:auto}@media (width<=640px){.hoc-ghi-nho{padding:1rem .5rem}.hnh-header h1{font-size:1.5rem}.hnh-header .subtitle{font-size:.9rem}.stats-bar{grid-template-columns:repeat(2,1fr);gap:.75rem}.stat-item{padding:.75rem}.stat-value{font-size:1.25rem}.navigation-buttons{flex-wrap:wrap;gap:.5rem}.nav-btn{flex:0 calc(50% - .25rem);max-width:none}.jump-control{flex:0 100%;justify-content:center}.jump-input{width:45px;font-size:.875rem}.session-control{flex-direction:column}.restart-btn,.change-content-btn{width:100%}}@media (prefers-reduced-motion:reduce){.progress-bar,.nav-btn,.finish-message{transition:none!important;animation:none!important}}