/* DTT About Page ---------------------------------------------------------
 * Dedicated visual system for /gioi-thieu/.
 */

.dtt-about-page,
.dtt-about-page * {
    box-sizing: border-box;
}

.dtt-about-page {
    --about-ink:#241d1a;
    --about-muted:#776d67;
    --about-border:rgba(82,69,58,.12);
    --about-orange:#f56a1f;
    --about-purple:#7c5df6;
    min-height:72vh;
    background:
        radial-gradient(circle at 7% 0%,rgba(245,106,31,.055),transparent 25rem),
        radial-gradient(circle at 93% 4%,rgba(124,93,246,.06),transparent 28rem),
        #fbfaf8;
    color:var(--about-ink);
}

.dtt-about-shell {
    width:min(1480px,calc(100% - 32px));
    margin:0 auto;
    padding:clamp(28px,4vw,56px) 0 clamp(84px,8vw,124px);
}

.dtt-about-hero {
    position:relative;
    display:grid;
    grid-template-columns:minmax(0,1.13fr) minmax(340px,.87fr);
    gap:clamp(36px,5vw,82px);
    align-items:center;
    min-height:430px;
    overflow:hidden;
    padding:clamp(30px,4.8vw,64px);
    border:1px solid rgba(255,255,255,.07);
    border-radius:40px;
    background:
        radial-gradient(circle at 88% 8%,rgba(124,93,246,.31),transparent 28rem),
        radial-gradient(circle at 4% 98%,rgba(245,106,31,.18),transparent 30rem),
        linear-gradient(135deg,#171319 0%,#241a28 58%,#17151d 100%);
    box-shadow:0 34px 88px rgba(28,20,24,.17);
    color:#fff;
    isolation:isolate;
}

.dtt-about-hero::before {
    position:absolute;
    inset:0;
    z-index:-1;
    background:
        linear-gradient(rgba(255,255,255,.024) 1px,transparent 1px),
        linear-gradient(90deg,rgba(255,255,255,.024) 1px,transparent 1px);
    background-size:38px 38px;
    content:"";
    opacity:.48;
    -webkit-mask-image:linear-gradient(90deg,#000 0%,rgba(0,0,0,.52) 58%,transparent 100%);
    mask-image:linear-gradient(90deg,#000 0%,rgba(0,0,0,.52) 58%,transparent 100%);
}

.dtt-about-breadcrumb {
    display:inline-flex;
    align-items:center;
    gap:8px;
    margin:0 0 26px;
    padding:7px 12px;
    border:1px solid rgba(255,255,255,.10);
    border-radius:999px;
    background:rgba(255,255,255,.05);
    color:rgba(255,255,255,.52);
    font-size:13px;
    font-weight:800;
    backdrop-filter:blur(10px);
}

.dtt-about-breadcrumb a {
    color:#ffd1b4;
    text-decoration:none;
}

.dtt-about-breadcrumb a:hover,
.dtt-about-breadcrumb a:focus-visible {
    color:#fff;
    text-decoration:underline;
    text-underline-offset:3px;
}

.dtt-about-kicker {
    display:inline-flex;
    align-items:center;
    gap:9px;
    margin-bottom:14px;
    color:#ff9e68;
    font-size:12px;
    font-weight:900;
    letter-spacing:.17em;
}

.dtt-about-kicker::before {
    width:25px;
    height:2px;
    border-radius:99px;
    background:linear-gradient(90deg,#ff9b63,#b09eff);
    content:"";
}

.dtt-about-hero h1 {
    max-width:760px;
    margin:0;
    color:#fff;
    font-size:clamp(48px,6vw,84px);
    font-weight:950;
    letter-spacing:-.067em;
    line-height:.96;
    text-wrap:balance;
}

.dtt-about-hero h1 span {
    color:transparent;
    background:linear-gradient(92deg,#ff9c63 0%,#b09dff 60%,#ddd4ff 100%);
    -webkit-background-clip:text;
    background-clip:text;
    -webkit-text-fill-color:transparent;
}

.dtt-about-hero__copy > p {
    max-width:64ch;
    margin:21px 0 0;
    color:rgba(255,255,255,.66);
    font-size:17px;
    line-height:1.72;
}

.dtt-about-hero__actions {
    display:flex;
    flex-wrap:wrap;
    gap:9px;
    margin-top:27px;
}

.dtt-about-hero__actions a {
    display:inline-flex;
    min-height:44px;
    align-items:center;
    justify-content:center;
    gap:8px;
    padding:9px 16px;
    border:1px solid rgba(255,255,255,.11);
    border-radius:999px;
    background:rgba(255,255,255,.055);
    color:rgba(255,255,255,.74);
    font-size:13px;
    font-weight:900;
    text-decoration:none;
    transition:transform .2s ease,background .2s ease,color .2s ease;
}

.dtt-about-hero__actions a.is-primary {
    border-color:#fff;
    background:#fff;
    color:#241c22;
    box-shadow:0 12px 28px rgba(0,0,0,.16);
}

.dtt-about-hero__actions a:hover,
.dtt-about-hero__actions a:focus-visible {
    color:#fff;
    background:rgba(255,255,255,.09);
    transform:translateY(-2px);
}

.dtt-about-hero__actions a.is-primary:hover,
.dtt-about-hero__actions a.is-primary:focus-visible {
    color:#241c22;
    background:#fff;
}

.dtt-about-hero__visual {
    position:relative;
    display:grid;
    min-height:310px;
    place-items:center;
    overflow:hidden;
    border:1px solid rgba(255,255,255,.09);
    border-radius:30px;
    background:
        radial-gradient(circle at 50% 45%,rgba(124,93,246,.22),transparent 44%),
        rgba(255,255,255,.04);
    box-shadow:0 22px 50px rgba(0,0,0,.13);
    backdrop-filter:blur(18px);
}

.dtt-about-orbit {
    position:absolute;
    border:1px solid rgba(255,255,255,.07);
    border-radius:50%;
}

.dtt-about-orbit--one {
    width:255px;
    height:255px;
}

.dtt-about-orbit--two {
    width:360px;
    height:360px;
}

.dtt-about-hero__monogram {
    position:relative;
    z-index:2;
    width:190px;
    min-height:218px;
    padding:25px 23px;
    border:1px solid rgba(255,255,255,.12);
    border-radius:24px 24px 13px 13px;
    background:
        linear-gradient(150deg,rgba(255,255,255,.11),rgba(255,255,255,.035));
    box-shadow:0 28px 52px rgba(0,0,0,.24);
    transform:rotate(-4deg);
}

.dtt-about-hero__monogram::after {
    position:absolute;
    left:18px;
    right:18px;
    bottom:18px;
    height:1px;
    background:rgba(255,255,255,.11);
    content:"";
}

.dtt-about-hero__monogram span {
    display:block;
    color:#ffad7c;
    font-size:12px;
    font-weight:900;
    letter-spacing:.17em;
}

.dtt-about-hero__monogram strong {
    display:block;
    margin-top:6px;
    color:#fff;
    font-size:52px;
    font-weight:950;
    letter-spacing:-.06em;
    line-height:.95;
}

.dtt-about-hero__monogram em {
    position:absolute;
    left:23px;
    bottom:28px;
    color:rgba(255,255,255,.42);
    font-style:normal;
    font-size:12px;
    font-weight:850;
    line-height:1.45;
    letter-spacing:.08em;
}

.dtt-about-hero__mini {
    position:absolute;
    left:20px;
    right:20px;
    bottom:16px;
    display:flex;
    justify-content:space-between;
    color:rgba(255,255,255,.28);
    font-size:12px;
    font-weight:850;
    letter-spacing:.10em;
}

.dtt-about-stats {
    display:grid;
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:12px;
    margin:18px 0 clamp(34px,4vw,54px);
}

.dtt-about-stats > div {
    display:grid;
    grid-template-columns:46px minmax(0,1fr);
    gap:13px;
    align-items:center;
    min-height:92px;
    padding:15px 17px;
    border:1px solid var(--about-border);
    border-radius:21px;
    background:rgba(255,255,255,.82);
    box-shadow:0 10px 30px rgba(40,31,25,.045);
}

.dtt-about-stat__icon {
    display:grid;
    width:46px;
    height:46px;
    place-items:center;
    border-radius:14px;
    background:#f4f0ff;
    color:#684fd2;
    font-size:19px;
    font-weight:900;
}

.dtt-about-stats > div:nth-child(2) .dtt-about-stat__icon {
    background:#fff1e8;
    color:#e66e2d;
}

.dtt-about-stats > div:nth-child(3) .dtt-about-stat__icon {
    background:#eef7f1;
    color:#39745b;
}

.dtt-about-stats p {
    display:grid;
    gap:3px;
    margin:0;
}

.dtt-about-stats strong {
    color:#261f1c;
    font-size:30px;
    font-weight:950;
    letter-spacing:-.04em;
    line-height:1;
}

.dtt-about-stats p span {
    color:#887d76;
    font-size:13px;
    font-weight:750;
}

.dtt-about-layout {
    display:grid;
    grid-template-columns:280px minmax(0,1fr);
    gap:clamp(24px,3vw,40px);
    align-items:start;
}

.dtt-about-rail__inner {
    position:sticky;
    top:88px;
    display:grid;
    gap:14px;
}

.dtt-about-rail__head {
    padding:18px 18px 13px;
    border:1px solid var(--about-border);
    border-bottom:0;
    border-radius:21px 21px 0 0;
    background:rgba(255,255,255,.84);
}

.dtt-about-rail__head span {
    display:block;
    margin-bottom:4px;
    color:#9279eb;
    font-size:12px;
    font-weight:950;
    letter-spacing:.14em;
}

.dtt-about-rail__head strong {
    color:#2a221f;
    font-size:18px;
    font-weight:950;
}

.dtt-about-toc {
    display:grid;
    gap:3px;
    margin-top:-14px;
    padding:7px 8px 11px;
    border:1px solid var(--about-border);
    border-top:0;
    border-radius:0 0 21px 21px;
    background:rgba(255,255,255,.84);
}

.dtt-about-toc a {
    display:grid;
    grid-template-columns:28px minmax(0,1fr);
    gap:8px;
    align-items:start;
    padding:10px;
    border-radius:12px;
    color:#6e645e;
    text-decoration:none;
    transition:background .2s ease,color .2s ease,transform .2s ease;
}

.dtt-about-toc a > span {
    color:#e57030;
    font-size:12px;
    font-weight:950;
}

.dtt-about-toc a strong {
    font-size:13px;
    font-weight:850;
    line-height:1.43;
}

.dtt-about-toc a:hover,
.dtt-about-toc a:focus-visible {
    background:#f4f0ff;
    color:#5d45c4;
    transform:translateX(2px);
}

.dtt-about-rail__card {
    padding:17px;
    border:1px solid rgba(124,93,246,.12);
    border-radius:20px;
    background:linear-gradient(145deg,#f8f5ff,#fffaf5);
}

.dtt-about-rail__card > span {
    display:grid;
    width:38px;
    height:38px;
    margin-bottom:11px;
    place-items:center;
    border-radius:12px;
    background:#241c28;
    color:#fff;
    font-size:17px;
}

.dtt-about-rail__card strong {
    display:block;
    color:#2c2421;
    font-size:15px;
    font-weight:950;
}

.dtt-about-rail__card p {
    margin:6px 0 13px;
    color:#80756e;
    font-size:13px;
    line-height:1.55;
}

.dtt-about-rail__card a {
    color:#6149c7;
    font-size:13px;
    font-weight:900;
    text-decoration:none;
}

.dtt-about-content {
    min-width:0;
    overflow:hidden;
    border:1px solid var(--about-border);
    border-radius:29px;
    background:rgba(255,255,255,.91);
    box-shadow:0 18px 52px rgba(40,31,25,.06);
}

.dtt-about-content__intro {
    padding:clamp(28px,4vw,48px) clamp(24px,5vw,66px) 32px;
    border-bottom:1px solid rgba(82,69,58,.09);
    background:
        radial-gradient(circle at 92% 5%,rgba(124,93,246,.07),transparent 38%),
        #faf8f5;
}

.dtt-about-content__intro > span {
    display:inline-flex;
    color:#e97031;
    font-size:12px;
    font-weight:950;
    letter-spacing:.14em;
}

.dtt-about-content__intro h2 {
    max-width:800px;
    margin:8px 0 0;
    color:#281f1c;
    font-size:clamp(28px,3.5vw,46px);
    font-weight:950;
    letter-spacing:-.05em;
    line-height:1.05;
}

.dtt-about-content__intro p {
    max-width:700px;
    margin:13px 0 0;
    color:#7d716a;
    font-size:16px;
    line-height:1.7;
}

.dtt-about-prose {
    max-width:1000px;
    margin:0 auto;
    padding:clamp(32px,4.5vw,64px) clamp(24px,5vw,72px);
    color:#4d433e;
    font-size:17px;
    line-height:1.82;
    font-family:'Be Vietnam Pro',system-ui,sans-serif;
}

.dtt-about-prose > h2 {
    position:relative;
    scroll-margin-top:104px;
    margin:58px 0 20px;
    padding:0 0 14px 37px;
    border-bottom:1px solid rgba(82,69,58,.11);
    color:#28201d;
    font-size:clamp(24px,2.4vw,32px);
    font-weight:950;
    letter-spacing:-.035em;
    line-height:1.25;
}

.dtt-about-prose > h2:first-child {
    margin-top:0;
}

.dtt-about-prose > h2::before {
    position:absolute;
    left:0;
    top:.25em;
    width:22px;
    height:22px;
    border-radius:8px;
    background:linear-gradient(135deg,#f27a3d,#765bd8);
    box-shadow:0 6px 14px rgba(124,93,246,.14);
    content:"";
}

.dtt-about-prose h3 {
    margin:34px 0 12px;
    color:#302824;
    font-size:20px;
    font-weight:900;
    letter-spacing:-.02em;
}

.dtt-about-prose p {
    margin:0 0 1.25em;
    color:#504640;
}

.dtt-about-prose ul,
.dtt-about-prose ol {
    margin:0 0 26px;
    padding:0;
    list-style:none;
}

.dtt-about-prose li {
    position:relative;
    margin:0 0 10px;
    padding:13px 15px 13px 39px;
    border:1px solid rgba(82,69,58,.075);
    border-radius:14px;
    background:#fdfcfb;
    color:#504640;
}

.dtt-about-prose li::before {
    position:absolute;
    left:15px;
    top:19px;
    width:8px;
    height:8px;
    border-radius:50%;
    background:linear-gradient(135deg,#f27639,#846ae0);
    content:"";
}

.dtt-about-prose strong,
.dtt-about-prose b {
    color:#2c2421;
    font-weight:850;
}

.dtt-about-prose blockquote {
    margin:28px 0;
    padding:19px 21px;
    border-left:3px solid #765bd8;
    border-radius:0 14px 14px 0;
    background:#f6f2ff;
    color:#564c61;
    font-size:16px;
}

.dtt-about-prose hr {
    margin:40px 0;
    border:0;
    border-top:1px solid rgba(82,69,58,.10);
}

.dtt-about-prose a {
    color:#6048c8;
    font-weight:800;
    text-decoration:underline;
    text-decoration-color:rgba(96,72,200,.24);
    text-underline-offset:3px;
}

.dtt-about-cta {
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:24px;
    padding:clamp(24px,3vw,38px) clamp(24px,5vw,58px);
    border-top:1px solid rgba(255,255,255,.08);
    background:
        radial-gradient(circle at 86% 8%,rgba(124,93,246,.22),transparent 40%),
        linear-gradient(135deg,#1a1518,#28202e);
    color:#fff;
}

.dtt-about-cta > div:first-child > span {
    display:block;
    margin-bottom:5px;
    color:#ffad7a;
    font-size:12px;
    font-weight:950;
    letter-spacing:.14em;
}

.dtt-about-cta > div:first-child > strong {
    display:block;
    font-size:clamp(21px,2.3vw,30px);
    font-weight:950;
    letter-spacing:-.035em;
}

.dtt-about-cta p {
    max-width:650px;
    margin:7px 0 0;
    color:rgba(255,255,255,.55);
    font-size:14px;
    line-height:1.6;
}

.dtt-about-cta__actions {
    display:flex;
    flex:0 0 auto;
    flex-wrap:wrap;
    gap:8px;
}

.dtt-about-cta__actions a {
    display:inline-flex;
    min-height:40px;
    align-items:center;
    justify-content:center;
    padding:8px 13px;
    border:1px solid rgba(255,255,255,.12);
    border-radius:999px;
    background:rgba(255,255,255,.055);
    color:rgba(255,255,255,.72);
    font-size:13px;
    font-weight:900;
    text-decoration:none;
}

.dtt-about-cta__actions a.is-primary {
    background:#fff;
    color:#251d22;
}

@media (max-width:1050px) {
    .dtt-about-hero {
        grid-template-columns:minmax(0,1fr) 330px;
    }

    .dtt-about-layout {
        grid-template-columns:240px minmax(0,1fr);
    }
}

@media (max-width:840px) {
    .dtt-about-hero {
        grid-template-columns:1fr;
        min-height:0;
    }

    .dtt-about-hero__visual {
        min-height:230px;
    }

    .dtt-about-hero__monogram {
        width:160px;
        min-height:184px;
    }

    .dtt-about-hero__monogram strong {
        font-size:44px;
    }

    .dtt-about-stats {
        grid-template-columns:repeat(3,minmax(0,1fr));
    }

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

    .dtt-about-rail__inner {
        position:static;
    }

    .dtt-about-rail__card {
        display:none;
    }

    .dtt-about-toc {
        display:flex;
        flex-wrap:nowrap;
        gap:6px;
        overflow-x:auto;
        padding:8px 9px 11px;
        scroll-snap-type:x proximity;
        -webkit-overflow-scrolling:touch;
        scrollbar-width:none;
    }

    .dtt-about-toc::-webkit-scrollbar {
        display:none;
    }

    .dtt-about-toc a {
        flex:0 0 auto;
        display:inline-flex;
        max-width:240px;
        align-items:center;
        white-space:nowrap;
        scroll-snap-align:start;
    }

    .dtt-about-toc a strong {
        overflow:hidden;
        text-overflow:ellipsis;
    }
}

@media (max-width:640px) {
    .dtt-about-shell {
        width:calc(100% - 20px);
        padding-top:22px;
        padding-bottom:72px;
    }

    .dtt-about-hero {
        gap:24px;
        padding:24px 22px 26px;
        border-radius:28px;
    }

    .dtt-about-breadcrumb {
        margin-bottom:20px;
    }

    .dtt-about-hero h1 {
        font-size:clamp(42px,13vw,58px);
    }

    .dtt-about-hero__copy > p {
        margin-top:16px;
        font-size:16px;
        line-height:1.68;
    }

    .dtt-about-hero__actions {
        display:grid;
        grid-template-columns:1fr;
    }

    .dtt-about-hero__actions a {
        width:100%;
    }

    .dtt-about-hero__visual {
        min-height:205px;
    }

    .dtt-about-hero__mini {
        font-size:12px;
    }

    .dtt-about-stats {
        grid-template-columns:1fr;
        gap:8px;
        margin-top:12px;
    }

    .dtt-about-stats > div {
        min-height:78px;
    }

    .dtt-about-content {
        border-radius:22px;
    }

    .dtt-about-content__intro {
        padding:24px 18px 22px;
    }

    .dtt-about-content__intro p {
        font-size:15px;
    }

    .dtt-about-prose {
        padding:28px 18px 38px;
        font-size:16px;
        line-height:1.78;
    }

    .dtt-about-prose > h2 {
        margin-top:44px;
        padding-left:32px;
        font-size:22px;
    }

    .dtt-about-prose > h2::before {
        width:19px;
        height:19px;
    }

    .dtt-about-prose li {
        padding:12px 12px 12px 34px;
    }

    .dtt-about-prose li::before {
        left:13px;
        top:18px;
    }

    .dtt-about-cta {
        align-items:flex-start;
        flex-direction:column;
        padding:24px 18px;
    }

    .dtt-about-cta__actions {
        width:100%;
    }

    .dtt-about-cta__actions a {
        flex:1;
    }
}

@media (prefers-reduced-motion:reduce) {
    .dtt-about-page *,
    .dtt-about-page *::before,
    .dtt-about-page *::after {
        animation-duration:.01ms!important;
        animation-iteration-count:1!important;
        transition-duration:.01ms!important;
    }
}