@font-face{font-family:Patrick Hand;font-style:normal;font-display:swap;font-weight:400;src:url(../media/patrick-hand-vietnamese-400-normal.3-gvm4bs25cyy.woff2)format("woff2"),url(../media/patrick-hand-vietnamese-400-normal.3f_agearxg2en.woff)format("woff");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:Patrick Hand;font-style:normal;font-display:swap;font-weight:400;src:url(../media/patrick-hand-latin-ext-400-normal.2b1gs6y5ac4xc.woff2)format("woff2"),url(../media/patrick-hand-latin-ext-400-normal.2fbwuitr2fa7l.woff)format("woff");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:Patrick Hand;font-style:normal;font-display:swap;font-weight:400;src:url(../media/patrick-hand-latin-400-normal.3x8ls3bzy2y5u.woff2)format("woff2"),url(../media/patrick-hand-latin-400-normal.3fbmth21xl8k7.woff)format("woff");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}
.nb{--paper:#fdfdfb;--grid:#e3e8f6;--grid-strong:#cfd7ef;--margin-red:#f2a7a7;--pencil:#5d6b86;--red-pen:#c6372b;--font-hand:"Patrick Hand", "Comic Sans MS", cursive;--font-math:"Noto Serif", "Times New Roman", serif;--paper-radius:8px;background:var(--paper);font-size:15.5px}.nb .grid-paper,.nb .section-alt,.nb .page-hero{background-color:var(--paper);background-image:linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px), linear-gradient(var(--grid-strong) 1px, transparent 1px);background-size:24px 24px,24px 24px,96px 96px}.nb .section-white{background:var(--paper)}.nb .hand{font-family:var(--font-hand);color:var(--pencil);font-weight:400}.nb .math{font-family:var(--font-math)}.nb h1{letter-spacing:-.025em;font-size:clamp(30px,4vw,44px);line-height:1.12}.nb h2{letter-spacing:-.02em;font-size:clamp(24px,2.8vw,32px);line-height:1.18}.nb .section-head{text-align:left;margin-bottom:30px}.nb .section-head h2{display:flex}.nb .section-head p{max-width:62ch;font-size:16px}.nb .section-head .title-ico{display:none}.nb .page-hero{color:var(--text);border-bottom:1px solid var(--grid-strong);padding:30px 0 48px}.nb .page-hero:after{inset:0 auto 0 max(14px, calc(50% - var(--container) / 2 - 22px));background:var(--margin-red);width:2px}.nb .page-hero h1{color:var(--navy)}.nb .page-hero .lead{color:#3a4466;max-width:62ch;font-size:17px}.nb .page-hero .breadcrumb,.nb .page-hero .breadcrumb a{color:var(--pencil)}.nb .page-hero .chip-glass{border-color:var(--line-2);color:var(--navy);background:#fff}.nb .page-hero .chip-glass.is-on,.nb .page-hero .chip.is-on{background:var(--navy);border-color:var(--navy);color:#fff}.nb .page-hero-overlap{margin-top:-24px}.nb .page-hero .lib-popular,.nb .page-hero .legal-updated{color:var(--pencil)}.nb .ab-numkicker{font-family:var(--font-hand);letter-spacing:0;text-transform:none;color:var(--red-pen);font-size:21px;font-weight:400}.nb .ab-numkicker span{font-family:var(--font-sans)}.nb .ab-mini-label{letter-spacing:0;text-transform:none;color:var(--navy);font-size:14.5px}.nb .lib-kind-group .kicker{font-size:18px}.nb .kicker{font-family:var(--font-hand);letter-spacing:0;text-transform:none;color:var(--red-pen);font-size:20px;font-weight:400;line-height:1.2}.nb .btn{border-radius:14px}.nb .btn-sm{border-radius:10px}.nb .btn-primary{background:var(--navy)}.nb .btn-primary:hover{background:#121755}.nb .btn-sun{box-shadow:0 3px #d9a400}.nb .btn-sun:hover{background:#ffd65a}.nb .btn-sun:active{box-shadow:0 1px #d9a400}.nb .btn-outline{color:var(--navy);border-color:var(--navy)}.nb .card{border-radius:var(--paper-radius);border-color:#d6dcef;box-shadow:0 12px 28px -22px #1b216073}.nb .card-lg{border-radius:10px}.nb .card-soft{background:#f4f6fd}.nb .card-sun{box-shadow:none;background:#fff7d6}.nb .acc,.nb .table-wrap{border-radius:var(--paper-radius);border-color:#d6dcef}.nb .icon-chip{border-radius:8px}.nb .hl-sun{background:linear-gradient(#0000 55%,#ffc933bf 55% 92%,#0000 92%)}.nb .auth-aside{color:var(--text);background-color:var(--paper);background-image:linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);border:1px solid var(--grid-strong);border-radius:var(--paper-radius);background-size:24px 24px;padding-left:56px}.nb .auth-aside:after{background:var(--margin-red);border-radius:0;width:2px;height:auto;inset:0 auto 0 30px}.nb .auth-aside h2{color:var(--navy)}.nb .auth-aside h2 span{color:var(--navy);background:linear-gradient(#0000 55%,#ffc933cc 55% 92%,#0000 92%)}.nb .auth-aside ul{color:#3a4466}.nb .acc-hero{color:var(--text);border:1px solid #d6dcef;border-left:6px solid var(--navy);border-radius:var(--paper-radius);background:#fff}.nb .acc-hero h1{color:var(--navy)}.nb .acc-hero p{color:var(--pencil)}.nb .site-header{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);border-bottom-color:var(--grid-strong);background:#fdfdfbf0}.nb .site-header-inner{min-height:66px}.nb .main-nav a,.nb .nav-group>button{border-radius:10px;font-size:15px}.nb .nav-panel{border-radius:var(--paper-radius)}.nb .nav-panel a{border-radius:6px}.nb .menu-btn{border-radius:10px}.nb .site-footer{border-top:6px solid var(--sun)}@media (max-width:760px){.nb .page-hero{padding:22px 0 36px}.nb .page-hero:after{left:6px}}