@import url("https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800;900&display=swap");

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:inherit;
}

body,
button,
input{
    font-family:"Be Vietnam Pro", Arial, Helvetica, sans-serif;
}

:root{
    --bg:#f5f5f7;
    --surface:#ffffff;
    --surface-soft:#fff8f5;
    --border:#e7e4e2;
    --text:#202126;
    --muted:#6f7480;
    --accent:#ed4b2c;
    --accent-deep:#cf3217;
    --accent-soft:#fff0ea;
    --accent-border:#ffc5b5;
    --shadow:0 28px 80px rgba(54,42,38,.12);
}

body{
    min-height:100svh;
    overflow:hidden;
    background:#f7f7f9;
    color:var(--text);
}

[hidden]{
    display:none !important;
}

.search-box{
    display:grid;
    grid-template-columns:minmax(0,1fr) 156px;
    gap:8px;
    align-items:stretch;
    padding:6px;
    border:1px solid #e7e1de;
    border-radius:19px;
    background:rgba(255,255,255,.92);
    box-shadow:0 8px 28px rgba(37,29,26,.07),inset 0 1px 0 #fff;
    transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}

.search-box:focus-within{
    border-color:rgba(237,75,44,.5);
    box-shadow:0 0 0 4px rgba(237,75,44,.1),0 14px 34px rgba(37,29,26,.09);
    transform:translateY(-1px);
}

.search-box input{
    flex:1;
    min-width:0;
    min-height:58px;
    padding:0 17px;
    border:1px solid #e9e6e4;
    border-radius:13px;
    background:linear-gradient(180deg,#fbfbfc,#f7f7f9);
    color:var(--text);
    font-size:15px;
    font-weight:550;
    outline:none;
    box-shadow:inset 0 1px 2px rgba(35,29,27,.025);
    transition:border-color .18s ease,background .18s ease,box-shadow .18s ease;
}

.search-box input::placeholder{
    color:#9a9da6;
}

.search-box input:focus{
    border-color:rgba(237,75,44,.48);
    background:#fff;
    box-shadow:0 0 0 3px rgba(237,75,44,.08),inset 0 1px 2px rgba(35,29,27,.02);
}

.search-box input:-webkit-autofill,
.search-box input:-webkit-autofill:hover,
.search-box input:-webkit-autofill:focus{
    -webkit-text-fill-color:var(--text);
    -webkit-box-shadow:0 0 0 1000px #fbfbfc inset;
    caret-color:var(--text);
}

.search-box #fullName{
    grid-column:1 / -1;
}

.search-box #fullName.is-invalid{
    border-color:#e9553b;
    background:#fff5f2;
    box-shadow:0 0 0 3px rgba(233,85,59,.08);
}

.field-error{
    grid-column:1 / -1;
    margin:-2px 12px 2px;
    color:#c73b21;
    font-size:12px;
    font-weight:600;
    line-height:1.4;
}

.field-error[hidden]{
    display:none;
}

.name-field{
    grid-column:1 / -1;
    min-width:0;
}

.search-box .name-field #fullName{
    width:100%;
}

.search-box button{
    width:156px;
    min-height:58px;
    border:0;
    border-radius:14px;
    background:linear-gradient(135deg,#ff6848 0%,#ed4b2c 55%,#da351a 100%);
    color:#fff;
    cursor:pointer;
    font-size:15px;
    font-weight:800;
    letter-spacing:.01em;
    box-shadow:0 10px 22px rgba(225,55,26,.24),inset 0 1px 0 rgba(255,255,255,.28);
    transition:transform .2s ease,box-shadow .2s ease,filter .2s ease,opacity .2s ease;
}

.search-box button:hover{
    transform:translateY(-2px);
    filter:saturate(1.08);
    box-shadow:0 14px 28px rgba(225,55,26,.3),inset 0 1px 0 rgba(255,255,255,.3);
}

.search-box button:active{
    transform:translateY(0);
}

.search-box button:disabled{
    opacity:.65;
    cursor:not-allowed;
    transform:none;
    filter:none;
    box-shadow:none;
}

#result{
    position:relative;
    margin-top:16px;
    padding:20px 22px;
    border:1px solid rgba(225,221,219,.9);
    border-radius:18px;
    background:linear-gradient(145deg,rgba(255,255,255,.96),rgba(250,249,249,.88));
    min-height:0;
    box-shadow:inset 0 1px 0 #fff,0 10px 30px rgba(31,28,27,.035);
}

#result > p:only-child{
    color:#5f646f;
    font-size:14px;
}

#result p{
    margin:0;
    line-height:1.7;
}

#result p.error{
    color:#b42318;
    font-weight:600;
}

#result p.success{
    color:#027a48;
}

.product-card{
    display:grid;
    grid-template-columns:minmax(0,1fr);
    gap:18px;
    align-items:start;
}

.product-image{
    display:block;
    width:160px;
    height:160px;
    object-fit:cover;
    border-radius:18px;
    background:#fafafa;
    border:1px solid var(--border);
    box-shadow:0 10px 20px rgba(15,23,42,.06);
}

.product-content h2{
    margin-bottom:12px;
    color:var(--text);
    font-size:18px;
    line-height:1.5;
    letter-spacing:0;
    font-weight:700;
    word-break:break-word;
    overflow-wrap:anywhere;
    width:100%;
}

.product-content p{
    margin-bottom:9px;
    color:#394150;
    font-size:15px;
}

.product-content p strong{
    color:#111827;
    font-weight:700;
}

.product-content p.discount-highlight{
    margin-top:14px;
    padding:14px 16px;
    border-radius:16px;
    background:linear-gradient(135deg, #fff7ef 0%, #ffe8df 100%);
    border:1px solid var(--accent-border);
    color:#8f2d12;
    font-size:15px;
    font-weight:800;
    box-shadow:0 10px 24px rgba(240,68,35,.10);
    word-break:break-word;
    overflow-wrap:anywhere;
}

.product-content p.discount-highlight strong{
    color:#c2410c;
}

.your-commission{
    position:relative;
    isolation:isolate;
    display:flex;
    width:fit-content;
    max-width:100%;
    align-items:center;
    margin:12px 0 0 !important;
    padding:9px 13px;
    overflow:hidden;
    border:1px solid rgba(241,92,45,.52);
    border-radius:11px;
    background:linear-gradient(112deg,#fff7e9 0%,#ffe8c7 38%,#ffb277 68%,#ff8a5c 100%);
    background-size:180% 100%;
    color:#76240f;
    font-weight:700;
    box-shadow:0 0 0 3px rgba(255,112,66,.07),0 6px 18px rgba(219,67,28,.16);
    animation:commission-fire 3.4s ease-in-out infinite;
}

.your-commission::before{
    content:"";
    position:absolute;
    z-index:-1;
    inset:-35% -8%;
    background:radial-gradient(circle at 30% 75%,rgba(255,233,155,.65),transparent 27%),radial-gradient(circle at 78% 30%,rgba(255,103,55,.28),transparent 32%);
    filter:blur(12px);
    animation:commission-flame 3s ease-in-out infinite alternate;
}

.your-commission strong{
    color:#671807;
    font-weight:900;
    text-shadow:0 1px 0 rgba(255,255,255,.55),0 0 10px rgba(255,225,145,.7);
}

@keyframes commission-fire{
    0%,100%{background-position:0% 50%;box-shadow:0 0 0 3px rgba(255,112,66,.07),0 6px 18px rgba(219,67,28,.14)}
    50%{background-position:100% 50%;box-shadow:0 0 0 3px rgba(255,130,76,.1),0 8px 22px rgba(219,67,28,.22)}
}

@keyframes commission-flame{
    from{transform:translate3d(-3%,2%,0) scale(.98);opacity:.68}
    to{transform:translate3d(4%,-2%,0) scale(1.03);opacity:.9}
}

@media (prefers-reduced-motion:reduce){
    .your-commission,.your-commission::before{animation:none}
    .your-commission{background-position:52% 50%}
}

.purchase-link-card{
    margin-top:18px;
    padding:14px;
    border:1px solid rgba(240,68,31,.24);
    border-radius:16px;
    background:linear-gradient(135deg,rgba(255,247,242,.98),rgba(255,252,238,.94));
    box-shadow:0 12px 28px rgba(225,55,26,.08);
}

.purchase-link-heading{
    margin-bottom:9px;
}

.purchase-link-heading span{
    display:block;
    color:#b5472e;
    font-size:11px;
    font-weight:800;
    letter-spacing:.09em;
}

.buy-now-link{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:44px;
    padding:0 18px;
    border:0;
    border-radius:12px;
    color:#fff;
    background:linear-gradient(135deg,#ff6848,#da351a);
    box-shadow:0 8px 18px rgba(218,53,26,.22);
    font-size:13px;
    font-weight:800;
    text-decoration:none;
    cursor:pointer;
    transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;
}

.buy-now-link:hover{
    transform:translateY(-1px);
    filter:saturate(1.08);
}

.copy-link-button{
    display:grid;
    place-items:center;
    width:46px;
    min-height:44px;
    padding:0;
    border:1px solid rgba(237,75,44,.24);
    border-radius:12px;
    background:#fff;
    color:#d94a2d;
    cursor:pointer;
    box-shadow:0 5px 14px rgba(109,55,39,.07);
    transition:transform .18s ease,border-color .18s ease,background .18s ease,color .18s ease,box-shadow .18s ease;
}

.copy-link-button svg{width:20px;height:20px}
.copy-check-icon{display:none}
.copy-link-button:hover{transform:translateY(-1px);border-color:#ef8f78;background:#fff7f4;box-shadow:0 8px 18px rgba(218,53,26,.12)}
.copy-link-button.is-copied{border-color:#76c7a4;background:#edf9f3;color:#23825c}
.copy-link-button.is-copied .copy-icon{display:none}
.copy-link-button.is-copied .copy-check-icon{display:block}

.purchase-link-row{
    display:grid;
    grid-template-columns:minmax(0,1fr) 46px 112px;
    gap:9px;
}

.purchase-link-row input{
    width:100%;
    min-width:0;
    min-height:44px;
    padding:0 14px;
    border:1px solid #e6d9d4;
    border-radius:12px;
    outline:none;
    background:rgba(255,255,255,.92);
    color:#4b5563;
    font-size:13px;
}

.purchase-link-row input:focus{
    border-color:rgba(237,75,44,.5);
    box-shadow:0 0 0 3px rgba(237,75,44,.09);
}

.purchase-link-unavailable{
    color:#7c2d12;
}

.purchase-link-unavailable p{
    margin-top:8px !important;
    color:#7b5b50 !important;
    font-size:13px !important;
}

@media (max-width:520px){
    .purchase-link-row{
        grid-template-columns:46px minmax(0,1fr);
    }

    .purchase-link-row input{
        grid-column:1 / -1;
    }

    .buy-now-link{
        width:100%;
    }
}

.note-text,
.product-content p.note-text{
    display:flex;
    align-items:flex-start;
    gap:8px;
    width:fit-content;
    max-width:100%;
    margin:14px 0 0 !important;
    padding:8px 11px;
    border:1px solid rgba(232,158,36,.22);
    border-left:3px solid #ee9a22;
    border-radius:9px;
    background:linear-gradient(100deg,rgba(255,248,225,.92),rgba(255,252,241,.7));
    color:#765829;
    font-family:inherit;
    font-size:12px;
    font-weight:500;
    line-height:1.55;
    letter-spacing:0;
    word-break:break-word;
    overflow-wrap:anywhere;
    -webkit-font-smoothing:antialiased;
    text-rendering:optimizeLegibility;
}

.note-text::before{
    content:"!";
    display:grid;
    place-items:center;
    flex:0 0 17px;
    width:17px;
    height:17px;
    margin-top:1px;
    border-radius:50%;
    background:#ee9a22;
    color:#fff;
    font-size:11px;
    font-weight:900;
    line-height:1;
}


.product-info-row{
    display:grid;
    grid-template-columns:minmax(0,1fr) 220px;
    gap:22px;
    align-items:stretch;
}

.commission-panel{
    display:flex;
    flex-direction:column;
    justify-content:center;
    gap:7px;
    padding:20px;
    border:1px solid var(--accent-border);
    border-radius:18px;
    background:linear-gradient(135deg, #fff7ef 0%, #ffe8df 100%);
    color:#8f2d12;
    box-shadow:0 10px 24px rgba(240,68,35,.10);
}

.commission-panel span{
    color:#a14a34;
    font-size:12px;
    font-weight:700;
}

.commission-panel strong{
    color:#c2410c;
    font-size:27px;
    line-height:1;
    letter-spacing:-.04em;
}

.commission-panel b{
    color:#8f2d12;
    font-size:14px;
}

@media (max-width: 720px){
    .search-box{
        grid-template-columns:1fr;
        padding:6px;
        gap:7px;
    }

    .search-box button{
        width:100%;
        min-height:52px;
    }

    .search-box input{
        width:100%;
        min-height:52px;
        padding-inline:14px;
        font-size:14px;
    }

    .search-box #fullName{
        border-right:0;
        border-bottom:1px solid #ece7e4;
    }

    #result{
        margin-top:16px;
        padding:18px;
        border-radius:17px;
        min-height:0;
    }

    .product-card{
        grid-template-columns:1fr;
        gap:14px;
    }

    .product-info-row{
        grid-template-columns:1fr;
        gap:14px;
    }

    .product-image{
        width:100%;
        height:auto;
        aspect-ratio:1 / 1;
        border-radius:16px;
    }

    .product-content h2{
        font-size:17px;
        line-height:1.45;
    }

    .product-content p{
        font-size:14px;
    }

    .product-content p.discount-highlight{
        font-size:14px;
        padding:12px 14px;
    }

    .discount-note{
        font-size:12px;
        line-height:1.55;
        margin-top:8px;
    }
}

@media (max-width: 420px){
    #result{
        padding:15px;
    }

    .product-content h2{
        font-size:16px;
    }

    .product-content p,
    .discount-note{
        font-size:13px;
    }

    .discount-note{
        line-height:1.5;
    }

    .search-box,
    .search-box input,
    .search-box button{
        border-radius:13px;
    }
}

.contact-actions{
    position:fixed;
    right:0;
    bottom:22px;
    z-index:20;
    display:flex;
    flex-direction:column;
    align-items:flex-end;
    gap:10px;
    pointer-events:none;
}

.contact-button{
    --contact-width:132px;
    --contact-glow:rgba(0,104,255,.34);
    position:relative;
    isolation:isolate;
    display:flex;
    align-items:center;
    gap:10px;
    width:var(--contact-width);
    min-height:54px;
    padding:8px 16px 8px 9px;
    overflow:hidden;
    border:1px solid rgba(255,255,255,.62);
    border-right:0;
    border-radius:20px 0 0 20px;
    color:#fff;
    text-decoration:none;
    font-size:14px;
    font-weight:800;
    letter-spacing:-.01em;
    pointer-events:auto;
    transform:translateX(calc(100% - 56px));
    box-shadow:-8px 10px 26px var(--contact-glow),inset 0 1px 0 rgba(255,255,255,.34);
    transition:transform .38s cubic-bezier(.2,.85,.2,1),box-shadow .25s ease,filter .25s ease;
}

.contact-button::before{
    content:"";
    position:absolute;
    inset:-45% -30%;
    z-index:-1;
    background:linear-gradient(105deg,transparent 30%,rgba(255,255,255,.42) 46%,transparent 62%);
    transform:translateX(-70%) rotate(7deg);
    transition:transform .6s ease;
}

.contact-button:hover,
.contact-button:focus-visible{
    transform:translateX(0);
    filter:saturate(1.12) brightness(1.04);
    box-shadow:-14px 15px 36px var(--contact-glow),inset 0 1px 0 rgba(255,255,255,.42);
}

.contact-button:hover::before,
.contact-button:focus-visible::before{
    transform:translateX(72%) rotate(7deg);
}

.contact-button:active{
    filter:brightness(.96);
}

.contact-button:focus-visible{
    outline:3px solid rgba(240,68,35,.35);
    outline-offset:3px;
}

.contact-button img{
    width:36px;
    height:36px;
    flex:0 0 36px;
    padding:2px;
    border:1px solid rgba(255,255,255,.66);
    border-radius:50%;
    background:#fff;
    object-fit:contain;
    box-shadow:0 5px 14px rgba(16,28,65,.2);
    transition:transform .3s ease;
}

.contact-button:hover img,
.contact-button:focus-visible img{
    transform:rotate(-7deg) scale(1.07);
}

.contact-button span{
    opacity:0;
    white-space:nowrap;
    transform:translateX(8px);
    transition:opacity .2s ease .08s,transform .3s ease .05s;
}

.contact-button:hover span,
.contact-button:focus-visible span{
    opacity:1;
    transform:translateX(0);
}

.contact-zalo{
    background:linear-gradient(135deg,#1485ff 0%,#0068ff 56%,#0755d7 100%);
}

.contact-messenger{
    --contact-width:166px;
    --contact-glow:rgba(123,55,239,.32);
    background:linear-gradient(128deg,#13b8ff 0%,#0878ff 30%,#7745f4 66%,#e62dc3 100%);
}

@media (max-width:720px){
    .contact-actions{
        bottom:12px;
        gap:7px;
    }

    .contact-button,
    .contact-messenger{
        --contact-width:50px;
        width:50px;
        min-height:50px;
        padding:6px;
        border-radius:17px 0 0 17px;
        justify-content:center;
        transform:none;
    }

    .contact-button img{
        width:36px;
        height:36px;
        flex-basis:36px;
    }

    .contact-button span{
        position:absolute;
        width:1px;
        height:1px;
        overflow:hidden;
        clip-path:inset(50%);
    }
}

.about-page button:focus-visible,
.about-page a:focus-visible{
    outline:3px solid rgba(240,68,35,.3);
    outline-offset:3px;
}

body.about-page{
    min-height:100svh;
    overflow-x:hidden;
    overflow-y:auto;
    scroll-behavior:smooth;
    background:
        radial-gradient(circle at 12% 4%, rgba(255,112,75,.2), transparent 26rem),
        radial-gradient(circle at 92% 35%, rgba(255,196,120,.18), transparent 24rem),
        #f7f7f9;
    color:#20232c;
}

.about-ambient{
    position:fixed;
    inset:0;
    z-index:-1;
    pointer-events:none;
    overflow:hidden;
}

.about-orb{
    position:absolute;
    border-radius:50%;
    filter:blur(20px);
    opacity:.55;
}

.about-orb:first-child{
    width:340px;
    height:340px;
    top:-170px;
    left:12%;
    background:rgba(255,103,70,.2);
}

.about-orb:last-child{
    width:300px;
    height:300px;
    right:-140px;
    top:35%;
    background:rgba(255,190,92,.18);
}

.about-header,
.about-main,
.about-footer{
    width:min(1160px, calc(100% - 40px));
    margin-inline:auto;
}

.about-header{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:20px;
    padding:24px 0;
}

.about-brand{
    display:flex;
    align-items:center;
    gap:11px;
    padding:0;
    border:0;
    background:none;
    color:#20232c;
    cursor:pointer;
    font-size:15px;
    font-weight:800;
    letter-spacing:-.02em;
    text-decoration:none;
}

.about-brand-mark{
    display:grid;
    place-items:center;
    width:38px;
    height:38px;
    border-radius:12px;
    background:linear-gradient(145deg,#ff7553,#ed3f20);
    color:#fff;
    box-shadow:0 10px 24px rgba(240,68,35,.22);
}

.about-brand-mark svg{
    width:20px;
    height:20px;
}

.brand-highlight{
    color:#d9381c;
    font-weight:900;
}

.about-back,
.about-primary{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    min-height:46px;
    padding:0 18px;
    border:0;
    border-radius:999px;
    cursor:pointer;
    font-size:14px;
    font-weight:700;
    text-decoration:none;
    transition:transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.about-back{
    border:1px solid #e1e3e9;
    background:rgba(255,255,255,.72);
    color:#343842;
}

.about-back:hover,
.about-primary:hover{
    transform:translateY(-2px);
}

.about-back:hover{
    background:#fff;
    box-shadow:0 10px 24px rgba(31,36,48,.08);
}

.about-hero{
    display:grid;
    grid-template-columns:minmax(0,1.05fr) minmax(360px,.95fr);
    gap:64px;
    align-items:center;
    min-height:570px;
    padding:60px 0 76px;
}

.about-eyebrow{
    display:inline-flex;
    align-items:center;
    gap:8px;
    margin-bottom:18px;
    color:#d53d1e;
    font-size:12px;
    font-weight:800;
    letter-spacing:.15em;
}

.about-eyebrow::before{
    content:"";
    width:24px;
    height:2px;
    border-radius:99px;
    background:#f04423;
}

.about-hero h1{
    max-width:680px;
    margin:0 0 24px;
    text-align:left;
    color:#1f222a;
    font-size:clamp(46px,6vw,76px);
    line-height:1.03;
    letter-spacing:-.055em;
}

.about-hero h1 span{
    background:linear-gradient(100deg,#ed3f20 0%,#ff7957 55%,#f7a52e 100%);
    -webkit-background-clip:text;
    background-clip:text;
    color:transparent;
}

.about-lead{
    max-width:610px;
    color:#626978;
    font-size:17px;
    line-height:1.8;
}

.about-actions{
    display:flex;
    align-items:center;
    gap:22px;
    margin-top:32px;
}

.about-primary{
    min-height:52px;
    padding-inline:23px;
    background:linear-gradient(145deg,#ff6d4b,#ed3f20);
    color:#fff;
    box-shadow:0 14px 30px rgba(240,68,35,.24);
}

.about-primary:hover{
    box-shadow:0 18px 34px rgba(240,68,35,.3);
}

.about-assurance{
    color:#717888;
    font-size:13px;
    font-weight:600;
}

.about-visual{
    position:relative;
    display:grid;
    place-items:center;
    min-height:430px;
}

.about-preview{
    position:relative;
    width:min(440px,100%);
    padding:18px;
    border:1px solid rgba(255,255,255,.88);
    border-radius:28px;
    background:rgba(255,255,255,.74);
    box-shadow:0 32px 80px rgba(50,43,40,.14);
    backdrop-filter:blur(18px);
    transform:rotate(2deg);
    animation:about-float 5s ease-in-out infinite;
}

.about-preview-bar{
    display:flex;
    align-items:center;
    gap:6px;
    padding:2px 2px 16px;
}

.about-preview-bar i{
    width:7px;
    height:7px;
    border-radius:50%;
    background:#d8dae0;
}

.about-preview-bar span{
    margin-left:auto;
    color:#8b909c;
    font-size:11px;
    font-weight:700;
}

.about-preview-content{
    padding:24px;
    border:1px solid #ececf0;
    border-radius:21px;
    background:#fff;
}

.about-product-line{
    display:flex;
    align-items:center;
    gap:13px;
    padding-bottom:20px;
    border-bottom:1px solid #eeeeF2;
}

.about-product-icon{
    display:grid;
    place-items:center;
    width:50px;
    height:50px;
    border-radius:15px;
    background:#fff0ea;
    color:#e44324;
}

.about-product-icon svg{
    width:25px;
    height:25px;
}

.about-product-copy strong,
.about-product-copy span{
    display:block;
}

.about-product-copy strong{
    margin-bottom:5px;
    font-size:14px;
}

.about-product-copy span{
    color:#9196a1;
    font-size:11px;
}

.about-reward{
    margin-top:20px;
    padding:20px;
    border:1px solid #ffcaba;
    border-radius:18px;
    background:linear-gradient(130deg,#fff7f3,#ffebe4);
}

.about-reward span,
.about-reward small{
    display:block;
}

.about-reward span{
    margin-bottom:9px;
    color:#a14a34;
    font-size:12px;
    font-weight:700;
}

.about-reward strong{
    color:#c83a1c;
    font-size:26px;
    letter-spacing:-.04em;
}

.about-reward small{
    margin-top:7px;
    color:#a16b5e;
    font-size:11px;
}

.about-mini-card{
    position:absolute;
    right:-24px;
    bottom:40px;
    padding:13px 16px;
    border:1px solid rgba(255,255,255,.9);
    border-radius:16px;
    background:rgba(255,255,255,.88);
    box-shadow:0 16px 35px rgba(31,36,48,.12);
    color:#4d5360;
    font-size:12px;
    font-weight:700;
    transform:rotate(-4deg);
}

.about-mini-card::before{
    content:"✓";
    display:inline-grid;
    place-items:center;
    width:23px;
    height:23px;
    margin-right:7px;
    border-radius:50%;
    background:#e8f8ef;
    color:#138a4b;
}

.checker-section{
    scroll-margin-top:24px;
    padding:70px 0 82px;
}

.checker-section-heading{
    max-width:680px;
    margin:0 auto 30px;
    text-align:center;
}

.checker-section-heading .about-eyebrow{
    margin-bottom:14px;
}

.checker-section-heading h2{
    margin:0 0 12px;
    font-size:clamp(34px,4.6vw,54px);
    line-height:1.08;
    letter-spacing:-.05em;
}

.checker-section-heading>p:last-child{
    color:#707684;
    line-height:1.7;
}

.checker-card{
    position:relative;
    width:min(980px,100%);
    margin:0 auto;
    padding:clamp(20px,3vw,32px);
    overflow:hidden;
    border:1px solid rgba(255,255,255,.94);
    border-radius:28px;
    background:rgba(255,255,255,.82);
    box-shadow:0 28px 75px rgba(57,42,36,.12),0 0 0 1px rgba(237,75,44,.05);
    backdrop-filter:blur(22px) saturate(125%);
}

.checker-card::before{
    content:"";
    position:absolute;
    inset:0 auto auto 10%;
    width:80%;
    height:1px;
    background:linear-gradient(90deg,transparent,rgba(237,75,44,.4),transparent);
}

.checker-card .search-box{
    padding:0;
    border:0;
    border-radius:0;
    background:transparent;
    box-shadow:none;
}

.checker-card .search-box:focus-within{
    border-color:transparent;
    box-shadow:none;
    transform:none;
}

.checker-card #result{
    margin-top:16px;
}

.checker-card #result>p:only-child{
    text-align:center;
}

.checker-card .product-content h2{
    font-size:18px;
    letter-spacing:0;
}

.checker-card .purchase-link-card{
    margin-top:18px;
}

.about-section{
    padding:84px 0;
}

.about-section-heading{
    max-width:700px;
    margin-bottom:34px;
}

.about-section-heading h2{
    margin-bottom:13px;
    font-size:clamp(30px,4vw,46px);
    line-height:1.15;
    letter-spacing:-.04em;
}

.about-section-heading p{
    color:#717786;
    line-height:1.7;
}

.about-feature-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:18px;
}

.about-feature{
    padding:28px;
    border:1px solid #e6e7eb;
    border-radius:22px;
    background:rgba(255,255,255,.7);
    transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.about-feature:hover{
    transform:translateY(-5px);
    border-color:#ffc8ba;
    box-shadow:0 20px 46px rgba(31,36,48,.09);
}

.about-feature-number{
    display:block;
    margin-bottom:34px;
    color:#ed4b2c;
    font-size:12px;
    font-weight:800;
    letter-spacing:.12em;
}

.about-feature h3{
    margin-bottom:11px;
    font-size:20px;
    letter-spacing:-.025em;
}

.about-feature p{
    color:#737987;
    font-size:14px;
    line-height:1.7;
}

.about-note{
    display:flex;
    align-items:flex-start;
    gap:14px;
    margin-top:22px;
    padding:20px 22px;
    border:1px solid #ffe0d5;
    border-radius:18px;
    background:#fff8f5;
    color:#7c5145;
    font-size:13px;
    line-height:1.7;
}

.about-note strong{
    color:#b53c21;
}

.about-combined-grid{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:clamp(28px,5vw,64px);
    align-items:start;
}

.about-combined-column{
    min-width:0;
}

.about-combined-column + .about-combined-column{
    padding-left:clamp(28px,5vw,64px);
    border-left:1px solid #e3e4e8;
}

.about-combined-column .about-section-heading{
    min-height:230px;
    margin-bottom:24px;
}

.about-feature-stack{
    display:grid;
    gap:14px;
}

.about-feature-stack .about-feature{
    min-height:0;
    padding:23px 24px;
}

.about-feature-stack .about-feature-number{
    margin-bottom:17px;
}

.about-faq-section{
    padding-top:60px;
}

.about-faq-grid{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:14px;
}

.about-faq{
    align-self:start;
    border:1px solid #e4e5e9;
    border-radius:18px;
    background:rgba(255,255,255,.78);
    box-shadow:0 10px 28px rgba(31,36,48,.045);
    transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}

.about-faq:hover,
.about-faq[open]{
    border-color:#ffc8ba;
    box-shadow:0 16px 36px rgba(31,36,48,.075);
}

.about-faq summary{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:18px;
    min-height:68px;
    padding:18px 20px;
    color:#2d3139;
    cursor:pointer;
    list-style:none;
    font-size:14px;
    font-weight:700;
    line-height:1.5;
}

.about-faq summary::-webkit-details-marker{
    display:none;
}

.about-faq summary::after{
    content:"+";
    display:grid;
    place-items:center;
    width:26px;
    height:26px;
    flex:none;
    border-radius:50%;
    background:#fff0ea;
    color:#d54224;
    font-size:18px;
    font-weight:500;
    transition:transform .2s ease;
}

.about-faq[open] summary::after{
    transform:rotate(45deg);
}

.about-faq p{
    padding:0 20px 20px;
    color:#737987;
    font-size:13px;
    line-height:1.75;
}

.about-footer{
    display:flex;
    justify-content:space-between;
    gap:24px;
    padding:30px 0 40px;
    border-top:1px solid #e3e4e8;
    color:#858b97;
    font-size:12px;
}

.about-footer a{
    padding:0;
    border:0;
    background:none;
    color:#d54224;
    cursor:pointer;
    font:inherit;
    font-weight:700;
    text-decoration:none;
}

@keyframes about-float{
    0%,100%{transform:rotate(2deg) translateY(0)}
    50%{transform:rotate(1deg) translateY(-10px)}
}

@media (max-width:820px){
    .about-hero{
        grid-template-columns:1fr;
        gap:28px;
        padding:50px 0 60px;
    }

    .about-visual{
        min-height:390px;
    }

    .about-feature-grid{
        grid-template-columns:1fr;
    }

    .about-feature-number{
        margin-bottom:20px;
    }

    .about-combined-grid{
        grid-template-columns:1fr;
        gap:54px;
    }

    .about-combined-column + .about-combined-column{
        padding:54px 0 0;
        border-top:1px solid #e3e4e8;
        border-left:0;
    }

    .about-combined-column .about-section-heading{
        min-height:0;
    }

    .about-faq-grid{
        grid-template-columns:1fr;
    }

    .checker-section{
        padding:56px 0 68px;
    }
}

@media (max-width:560px){
    .about-header,
    .about-main,
    .about-footer{
        width:min(100% - 28px,1160px);
    }

    .about-header{
        padding:16px 0;
    }

    .about-brand{
        gap:7px;
    }

    .about-brand span:last-child{
        display:block;
        max-width:58px;
        font-size:10px;
        line-height:1.25;
    }

    .about-back{
        min-height:42px;
        padding-inline:14px;
        font-size:12px;
    }

    .about-hero{
        min-height:0;
        padding-top:40px;
    }

    .about-hero h1{
        font-size:clamp(40px,13vw,58px);
    }

    .about-lead{
        font-size:15px;
    }

    .about-actions{
        align-items:flex-start;
        flex-direction:column;
        gap:14px;
    }

    .about-visual{
        min-height:340px;
    }

    .about-preview{
        padding:11px;
        border-radius:22px;
    }

    .checker-section{
        padding:46px 0 58px;
    }

    .checker-section-heading{
        margin-bottom:22px;
        text-align:left;
    }

    .checker-section-heading .about-eyebrow{
        margin-bottom:12px;
    }

    .checker-card{
        padding:15px;
        border-radius:22px;
    }

    .about-preview-content{
        padding:17px;
    }

    .about-mini-card{
        right:-3px;
        bottom:16px;
    }

    .about-section{
        padding:62px 0;
    }

    .about-feature{
        padding:23px;
    }

    .about-footer{
        flex-direction:column;
        padding-bottom:28px;
    }
}

@media (prefers-reduced-motion:reduce){
    .about-preview{
        animation:none;
    }

    .about-page *,
    .about-page *::before,
    .about-page *::after{
        scroll-behavior:auto !important;
        transition-duration:.01ms !important;
    }
}

/* Giao diện compact cho laptop hoặc trình duyệt có chiều cao thấp. */
@media (min-width:721px) and (max-height:900px){

    .search-box{
        gap:6px;
        padding:5px;
        border-radius:17px;
    }

    .search-box input,
    .search-box button{
        min-height:52px;
    }

    .search-box input{
        padding-inline:16px;
        font-size:15px;
    }

    .search-box button{
        width:145px;
        border-radius:12px;
        font-size:14px;
    }

    #result{
        min-height:0;
        margin-top:12px;
        padding:17px 20px;
        border-radius:17px;
    }

    .product-content h2{
        margin-bottom:9px;
        font-size:17px;
        line-height:1.45;
    }

    .product-content p{
        margin-bottom:5px;
        font-size:14px;
        line-height:1.55;
    }

    .your-commission{
        margin:10px 0 0 !important;
        padding:8px 11px;
    }

    .note-text,
    .product-content p.note-text{
        margin-top:11px !important;
        font-size:12px;
        line-height:1.55;
    }

}

/* Bảng quy tắc đặt hàng tái tạo từ nội dung hướng dẫn. */
.order-rules-section{
    position:relative;
    margin:70px 0 54px;
    overflow:hidden;
    border:1px solid #dce6df;
    border-radius:30px;
    background:
        radial-gradient(circle at 7% 7%,rgba(255,177,45,.12),transparent 18%),
        radial-gradient(circle at 94% 8%,rgba(8,121,66,.09),transparent 17%),
        linear-gradient(180deg,#fff 0%,#fbfefc 100%);
    box-shadow:0 30px 80px rgba(16,74,47,.11);
    color:#103c28;
}

.order-rules-heading{
    padding:24px 26px 22px;
    text-align:center;
}

.order-rules-brand{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:9px;
    margin:0 0 12px;
    color:#096b3a;
    font-size:clamp(18px,2.2vw,25px);
    font-weight:800;
    line-height:1.35;
    letter-spacing:-.025em;
}

.order-rules-brand svg{width:36px;height:36px;flex:none;color:#17382a;transform:rotate(-5deg)}

.order-rules-heading h2{
    margin:0;
    color:#075e31;
    font-size:clamp(34px,4vw,48px);
    font-weight:900;
    line-height:1.12;
    letter-spacing:0;
    text-transform:uppercase;
    text-shadow:0 2px 0 rgba(255,255,255,.9);
}

.order-rules-subtitle{
    margin:5px 0 0;
    color:#242829;
    font-size:clamp(16px,1.8vw,21px);
    font-weight:800;
    line-height:1.3;
    text-transform:uppercase;
}

.order-rules-priority{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:20px;
    margin:0 20px;
    padding:14px 24px;
    border-radius:19px 19px 7px 7px;
    background:linear-gradient(115deg,#064d2a,#08713d 50%,#064d2a);
    color:#fff;
    box-shadow:inset 0 1px 0 rgba(255,255,255,.15),0 12px 26px rgba(5,83,43,.18);
}

.order-rules-priority>svg{width:51px;height:51px;flex:none;color:#ff8e20;filter:drop-shadow(0 4px 6px rgba(0,0,0,.14))}
.order-rules-priority div{display:grid;text-align:center}
.order-rules-priority span{font-size:clamp(13px,1.7vw,19px);font-weight:800;text-transform:uppercase}
.order-rules-priority strong{color:#ffd561;font-size:clamp(17px,2.6vw,31px);font-weight:900;line-height:1.25;text-transform:uppercase}
.order-rules-priority i{color:#fff;font-style:normal}

.order-rules-grid{
    display:grid;
    grid-template-columns:repeat(5,minmax(0,1fr));
    margin:10px 20px 0;
    overflow:hidden;
    border:1px solid #d5ded8;
    border-radius:16px;
    background:#fff;
}

.order-rule-card{
    display:flex;
    min-width:0;
    flex-direction:column;
    padding:15px 10px 20px;
    text-align:center;
}

.order-rule-card+.order-rule-card{border-left:1px solid #d5ded8}

.order-rule-title{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:7px;
    min-height:58px;
    margin-top:17px;
    padding:0 4px;
}

.order-rule-title>span{
    display:grid;
    place-items:center;
    width:28px;
    height:28px;
    flex:0 0 28px;
    border-radius:50%;
    background:linear-gradient(145deg,#0b8149,#056333);
    color:#fff;
    font-size:14px;
    font-weight:900;
    line-height:1;
    box-shadow:0 5px 12px rgba(5,101,52,.2);
}

.order-rule-title h3{
    width:auto;
    max-width:calc(100% - 35px);
    margin:0;
    color:#17221d;
    font-size:clamp(11px,1vw,13px);
    font-weight:800;
    line-height:1.4;
    letter-spacing:-.015em;
    text-align:center;
    text-wrap:balance;
    text-transform:uppercase;
}

.order-rule-visual{
    display:grid;
    place-items:center;
    height:116px;
    margin:3px 0 10px;
}

.order-rule-visual svg{width:min(180px,100%);height:116px;filter:drop-shadow(0 7px 8px rgba(13,61,38,.07))}

.order-rule-voucher-visual{
    min-height:116px
}

.voucher-demo-button{
    display:flex;
    align-items:center;
    justify-content:center;
    flex-direction:column;
    width:148px;
    height:58px;
    padding:0;
    border:0;
    border-radius:0;
    background:#d8011a;
    box-shadow:none;
    color:#fff;
    font-family:Arial,sans-serif;
    line-height:1;
    text-align:center
}

.voucher-demo-button span{
    font-size:14px;
    font-weight:400
}

.voucher-demo-button strong{
    margin-top:2px;
    font-size:18px;
    font-weight:700;
    letter-spacing:0
}

.order-rule-card>p{
    max-width:610px;
    margin:0;
    color:#626978;
    font-size:clamp(12px,1.08vw,14px);
    font-weight:400;
    line-height:1.72;
}

.order-rule-card>p strong{color:#df5a1f;font-weight:800}

.order-rule-last-link{
    position:relative;
    z-index:1;
    overflow:hidden;
    border:2px solid #ee4d2d !important;
    background:linear-gradient(160deg,#fff 0%,#fff7f3 58%,#ffe8df 100%);
    box-shadow:inset 0 0 0 4px rgba(238,77,45,.07),0 14px 34px rgba(205,55,27,.2)
}

.order-rule-last-link::before{
    content:"CỰC KỲ QUAN TRỌNG";
    position:absolute;
    top:0;
    right:0;
    left:0;
    padding:6px 8px;
    background:linear-gradient(90deg,#c92d15,#f45a37,#c92d15);
    color:#fff;
    font-size:9px;
    font-weight:900;
    letter-spacing:.08em;
    line-height:1;
    text-align:center
}

.order-rule-last-link::after{
    content:"";
    position:absolute;
    z-index:2;
    top:0;
    left:-70px;
    width:52px;
    height:21px;
    background:linear-gradient(90deg,transparent,rgba(255,255,255,.8),transparent);
    pointer-events:none;
    transform:skewX(-22deg)
}

.order-rule-last-link .order-rule-title>span{
    width:34px;
    height:34px;
    flex-basis:34px;
    background:#ee4d2d;
    font-size:18px;
    box-shadow:0 0 0 6px rgba(238,77,45,.12),0 8px 18px rgba(207,50,23,.3)
}

.order-rule-last-link .order-rule-title h3{
    color:#b92c18;
    font-weight:900
}

.order-rule-last-link>.order-rule-visual{
    margin-top:-2px
}

.order-rule-last-link>p{
    color:#3f302d;
    font-weight:650
}

.order-rule-last-link>p strong{
    color:#d9351b;
    font-weight:900
}

@media (prefers-reduced-motion:no-preference){
    .order-rule-last-link{
        animation:critical-border-pulse 1.8s ease-in-out infinite
    }

    .order-rule-last-link::after{
        animation:critical-banner-shine 1.8s ease-in-out infinite
    }
}

@keyframes critical-border-pulse{
    0%,100%{
        border-color:#ee4d2d;
        box-shadow:inset 0 0 0 4px rgba(238,77,45,.07),0 0 0 0 rgba(238,77,45,0),0 14px 34px rgba(205,55,27,.2)
    }
    50%{
        border-color:#ff8a68;
        box-shadow:inset 0 0 0 4px rgba(238,77,45,.12),0 0 0 8px rgba(238,77,45,.13),0 18px 42px rgba(205,55,27,.3)
    }
}

@keyframes critical-banner-shine{
    0%{left:-70px;opacity:0}
    15%{opacity:1}
    60%,100%{left:calc(100% + 20px);opacity:0}
}

.order-rules-warning{
    display:grid;
    grid-template-columns:38px auto minmax(0,1fr);
    align-items:center;
    column-gap:12px;
    margin:10px 20px 20px;
    padding:11px 18px;
    border:1px solid #f4c896;
    border-radius:9px 9px 18px 18px;
    background:linear-gradient(90deg,#fff7e9,#fffaf2 48%,#fff4e4);
    color:#543c28;
}

.order-warning-icon{
    display:grid;
    place-items:center;
    width:38px;
    height:34px;
    padding-top:8px;
    clip-path:polygon(50% 0,100% 100%,0 100%);
    background:#f18521;
    color:#fff;
    font-size:21px;
    font-weight:900;
    line-height:1;
}

.order-rules-warning>strong{
    padding-right:12px;
    border-right:1px solid #edc89d;
    color:#d86520;
    font-size:17px;
    font-weight:800;
    line-height:1.2;
    text-transform:uppercase;
}

.order-rules-warning p{margin:0;font-size:12px;font-weight:400;line-height:1.55}
.order-rules-warning p b{color:#d65427;font-weight:800}
.order-rules-warning>svg{width:34px;height:38px;justify-self:end}

@media (max-width:960px){
    .order-rules-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    .order-rule-card:nth-child(n+3){border-top:1px solid #d5ded8}
    .order-rule-card:nth-child(odd){border-left:0}
    .order-rule-card:last-child{grid-column:1/-1}
    .order-rule-title h3{font-size:14px}
}

@media (max-width:600px){
    .order-rules-section{margin:44px 0;border-radius:22px}
    .order-rules-heading{padding:22px 15px 18px}
    .order-rules-heading h2{font-size:32px}
    .order-rules-subtitle{font-size:16px}
    .order-rules-priority{gap:9px;margin-inline:10px;padding:11px 9px}
    .order-rules-priority>svg{width:40px;height:40px}
    .order-rules-priority span{font-size:10px}
    .order-rules-priority strong{font-size:14px}
    .order-rules-grid{grid-template-columns:1fr;margin:8px 10px 0}
    .order-rule-card:last-child{grid-column:auto}
    .order-rule-card+.order-rule-card{border-top:1px solid #d5ded8;border-left:0}
    .order-rule-card{padding:18px 22px 22px}
    .order-rule-title{min-height:auto}
    .order-rule-title h3{font-size:15px}
    .order-rule-visual{margin-block:10px}
    .order-rule-card>p{font-size:13px}
    .order-rules-warning{grid-template-columns:auto 1fr auto;gap:11px;margin:8px 10px 10px;padding:12px}
    .order-rules-warning>strong{padding:0;border:0;font-size:18px}
    .order-rules-warning p{grid-column:1/-1;grid-row:2;font-size:12px}
    .order-warning-icon{width:38px;height:33px;padding-top:8px;font-size:20px}
    .order-rules-warning>svg{width:34px;height:40px}
}

/* Đồng bộ bảng quy tắc với theme cam hiện tại. */
.order-rules-section{
    overflow:visible;
    border:0;
    border-radius:0;
    background:transparent;
    box-shadow:none;
    color:#5f291c;
}

.order-rules-brand,
.order-rules-heading h2{
    color:var(--accent-deep);
}

.order-rules-priority{
    background:linear-gradient(115deg,#c83218,var(--accent) 50%,#c83218);
    box-shadow:inset 0 1px 0 rgba(255,255,255,.2),0 12px 26px rgba(207,50,23,.2);
}

.order-rules-priority>svg{color:#ffd561}
.order-rules-grid{border-color:#f0d5cc}
.order-rule-card+.order-rule-card{border-color:#f0d5cc}

.order-rule-title>span{
    background:linear-gradient(145deg,#ff6848,var(--accent-deep));
    box-shadow:0 5px 12px rgba(207,50,23,.22);
}

.order-rule-visual [fill="#09864f"],
.order-rule-visual [fill="#078a50"],
.order-rule-visual [fill="#087b49"],
.order-rule-visual [fill="#07884f"]{
    fill:var(--accent);
}

.order-rule-visual [fill="#123b2c"]{
    fill:var(--accent-deep);
}

.order-rule-visual [stroke="#123b2c"]{
    stroke:var(--accent-deep);
}

.order-rule-visual [stroke="#80a393"]{
    stroke:#e49a83;
}

/* Khoảng cách trang compact. */
.about-header,
.about-main,
.about-footer{
    width:min(1200px,calc(100% - 24px));
}

.about-header{padding:16px 0}
.about-hero{min-height:520px;padding:38px 0 48px}
.about-actions{margin-top:24px}
.checker-section{padding:42px 0 48px}
.checker-section-heading{margin-bottom:20px}
.order-rules-section{margin:34px 0 28px}
.order-rules-heading{padding:16px 20px 18px}
.order-rules-grid{margin:6px 0 0}
.order-rules-warning{margin:8px 0 0}
.about-footer{padding:20px 0 24px}

@media (max-width:820px){
    .about-hero{padding:34px 0 42px}
    .checker-section{padding:36px 0 42px}
}

@media (max-width:560px){
    .about-header,
    .about-main,
    .about-footer{
        width:min(100% - 16px,1200px);
    }

    .about-header{padding:12px 0}
    .about-hero{padding:26px 0 34px}
    .checker-section{padding:30px 0 34px}
    .checker-section-heading{margin-bottom:16px}
    .order-rules-section{margin:26px 0 20px}
    .order-rules-heading{padding:14px 8px}
    .order-rules-grid{margin-top:4px}
    .order-rules-warning{margin-top:6px}
    .about-footer{padding:16px 0 20px}
}

/* Tiêu đề dùng chung cho ba phần. */
.screen-heading .screen-heading-kicker{
    display:inline-flex;
    align-items:center;
    gap:8px;
    margin:0 0 12px;
    color:var(--accent-deep);
    font-size:11px;
    font-weight:800;
    line-height:1.3;
    letter-spacing:.14em;
    text-transform:uppercase;
}

.screen-heading .screen-heading-title{
    max-width:720px;
    margin:0;
    color:#20232c;
    font-size:clamp(36px,4.8vw,60px);
    font-weight:800;
    line-height:1.08;
    letter-spacing:-.05em;
    text-align:inherit;
    text-transform:none;
    text-shadow:none;
    text-wrap:balance;
}

.screen-heading .screen-heading-description{
    max-width:680px;
    margin:14px 0 0;
    color:#707684;
    font-size:16px;
    font-weight:400;
    line-height:1.75;
    text-transform:none;
}

.screen-heading-centered{
    max-width:760px;
    margin-inline:auto;
    text-align:center;
}

.screen-heading-centered .screen-heading-kicker{
    justify-content:center;
}

.screen-heading-centered .screen-heading-description{
    margin-inline:auto;
}

/* Giữ điểm nhấn gradient của tiêu đề giới thiệu. */
.about-hero .screen-heading-title span{
    background:linear-gradient(100deg,#ed3f20 0%,#ff7957 55%,#f7a52e 100%);
    -webkit-background-clip:text;
    background-clip:text;
    color:transparent;
}

/* Header cố định và điều hướng ba phần. */
:root{
    --page-header-height:78px;
}

.about-header{
    position:fixed;
    top:10px;
    left:50%;
    z-index:100;
    display:grid;
    width:min(1200px,calc(100% - 24px));
    height:58px;
    grid-template-columns:repeat(4,minmax(0,1fr));
    align-items:center;
    margin:0;
    padding:7px 12px;
    border:1px solid rgba(255,255,255,.86);
    border-radius:18px;
    background:rgba(255,255,255,.76);
    box-shadow:0 14px 38px rgba(54,42,38,.1),inset 0 1px 0 #fff;
    backdrop-filter:blur(18px) saturate(1.3);
    transform:translateX(-50%);
}

.about-header-nav{
    display:grid;
    grid-column:2 / -1;
    grid-template-columns:repeat(3,minmax(0,1fr));
    align-self:stretch;
}

.header-nav-link{
    position:relative;
    display:flex;
    align-items:center;
    justify-content:center;
    min-width:0;
    border:0;
    background:transparent;
    color:#696d77;
    font-size:15px;
    font-weight:800;
    text-decoration:none;
    box-shadow:none;
    transition:color .2s ease,transform .2s ease;
}

.header-nav-link::after{
    content:"";
    position:absolute;
    right:32%;
    bottom:1px;
    left:32%;
    height:2px;
    border-radius:99px;
    background:var(--accent);
    opacity:0;
    transform:scaleX(.4);
    transition:opacity .2s ease,transform .2s ease;
}

.header-nav-link:hover{
    color:var(--accent-deep);
    transform:translateY(-1px);
}

.header-nav-link.is-active{
    color:var(--accent-deep);
}

.header-nav-link.is-active::after{
    opacity:1;
    transform:scaleX(1);
}

/* Ba phần chính: mỗi phần chiếm trọn một khung nhìn trên màn hình rộng. */
@media (min-width:821px){
    body.about-page{
        scroll-snap-type:y proximity;
    }

    .screen-section{
        min-height:100svh;
        scroll-snap-align:start;
        scroll-snap-stop:normal;
    }

    .about-hero.screen-section{
        grid-template-columns:minmax(0,1.08fr) minmax(380px,.92fr);
        gap:52px;
        min-height:100svh;
        padding:calc(var(--page-header-height) + 18px) 0 28px;
    }

    .about-hero.screen-section .about-preview{
        width:min(470px,100%);
    }

    .checker-section.screen-section{
        display:flex;
        min-height:100svh;
        padding:clamp(36px,7vh,72px) 0;
        flex-direction:column;
        justify-content:center;
    }

    .checker-section.screen-section > *{
        transform:translateY(clamp(-42px,-5vh,-24px));
    }

    .order-rules-section.screen-section{
        display:flex;
        min-height:100svh;
        margin:0;
        padding:clamp(20px,3vh,34px) 0;
        flex-direction:column;
        justify-content:center;
    }

    .order-rules-section.screen-section .order-rules-heading{
        padding:12px 20px 18px;
    }

    .order-rules-section.screen-section .order-rule-card{
        padding:16px 16px 22px;
    }

    .order-rules-section.screen-section .order-rule-title{
        min-height:56px;
    }

    .order-rules-section.screen-section .order-rule-title h3{
        font-size:clamp(13px,1.08vw,15px);
    }

    .order-rules-section.screen-section .order-rule-visual{
        height:clamp(96px,15vh,126px);
        margin:4px 0 12px;
    }

    .order-rules-section.screen-section .order-rule-visual svg{
        height:100%;
    }

    .order-rules-section.screen-section .order-rule-card > p{
        font-size:clamp(13px,1.12vw,15px);
        line-height:1.72;
    }

    .order-rules-section.screen-section .order-rules-warning{
        padding-block:14px;
    }

    .about-footer{
        margin-top:0;
    }
}

/* Màn hình thấp: ưu tiên đủ nội dung, section được phép cao hơn viewport. */
@media (min-width:821px) and (max-height:700px){
    .screen-section,
    .about-hero.screen-section{
        min-height:700px;
    }
}

@media (max-width:820px){
    :root{
        --page-header-height:72px;
    }

    .about-header{
        top:7px;
        width:calc(100% - 14px);
        height:56px;
        padding:6px 7px;
        border-radius:16px;
    }

    .about-header-nav{
        width:auto;
        gap:0;
    }

    .header-nav-link{
        min-height:36px;
        padding:0 8px;
        font-size:11px;
    }

    .header-nav-link::before{
        display:none;
    }

    .screen-section{
        min-height:100svh;
        scroll-margin-top:0;
    }

    .about-hero.screen-section,
    .checker-section.screen-section{
        display:flex;
        flex-direction:column;
        justify-content:center;
    }

    .about-hero.screen-section,
    .checker-section.screen-section,
    .order-rules-section.screen-section{
        padding-top:var(--page-header-height);
    }

    .order-rules-section.screen-section{
        min-height:100svh;
    }
}

@media (max-width:430px){
    .about-header{
        gap:6px;
        grid-template-columns:104px minmax(0,1fr);
    }

    .about-brand-mark{
        width:34px;
        height:34px;
        border-radius:10px;
    }

    .header-nav-link{
        padding-inline:7px;
        font-size:10px;
    }

    .about-hero.screen-section{
        gap:18px;
        padding-inline:14px;
    }

    .about-hero .screen-heading-title{
        font-size:clamp(30px,10vw,38px);
        line-height:1.05;
    }

    .about-hero .screen-heading-description{
        margin-top:10px;
        font-size:13px;
        line-height:1.65;
    }

    .about-hero .about-actions{
        margin-top:18px;
    }

    .about-hero .about-primary{
        min-height:44px;
        padding-inline:16px;
        font-size:12px;
    }
}