/* Vết Số public pages (home, cam kết). Colours and type come from the design system via /tokens.css + bundle.css. */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--surface); color: var(--ink); font: 400 16px/1.65 var(--font-sans); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.mono { font-family: var(--font-mono); }
.nowrap { white-space: nowrap; }
.wrap { width: min(1200px, 100% - 32px); margin-inline: auto; }
.kicker { margin: 0; font: 700 11px/1.4 var(--font-label); letter-spacing: .18em; text-transform: uppercase; color: var(--ink-muted); }
.h1, .h2, .h3 { margin: 0; font-family: var(--font-display); font-weight: 800; text-transform: uppercase; line-height: 1.22; text-wrap: balance; }
.h1 { font-size: clamp(40px, 5.4vw, 72px); }
.h2 { font-size: clamp(28px, 3.2vw, 40px); }
.h3 { font-size: 20px; line-height: 1.25; }
.lead { margin: 0; font-size: clamp(17px, 1.5vw, 19px); line-height: 1.6; color: var(--ink); max-width: 56ch; }
.muted { color: var(--ink-muted); }

/* buttons: the design system's .vs-btn, plus a link version */
a.vs-btn { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.note { margin: 0; font-size: 14px; color: var(--ink-muted); }

/* top bar, same as the app */
.bar { background: var(--xanh-dem); color: var(--trang-le-phuc); position: sticky; top: 0; z-index: 20; }
.bar-in { display: flex; align-items: center; gap: 12px 28px; min-height: 62px; }
.bar-logo img { height: 30px; width: auto; }
.bar nav { display: flex; gap: 24px; margin-left: auto; font-size: 14px; font-weight: 500; }
.bar nav a { color: #D6D9E6; text-decoration: none; }
.bar nav a:hover, .bar nav a[aria-current="page"] { color: var(--trang-le-phuc); text-decoration: underline; text-underline-offset: 5px; }
.bar .vs-btn { height: 38px; padding: 0 16px; font-size: 14px; border-color: var(--trang-le-phuc); color: var(--trang-le-phuc); }
.bar :focus-visible { outline-color: var(--vang-sao); }

/* hero: white page, the real silk on the conductor's stepped diagonal (top right) */
.hero { position: relative; overflow: hidden; isolation: isolate; border-bottom: 1px solid var(--line); }
.hero-silk, .hero-grain { position: absolute; inset: 0; clip-path: polygon(40.00% 0.00%, 47.50% 0.00%, 47.50% 9.00%, 55.00% 9.00%, 55.00% 18.00%, 62.50% 18.00%, 62.50% 27.00%, 70.00% 27.00%, 70.00% 36.00%, 77.50% 36.00%, 77.50% 45.00%, 85.00% 45.00%, 85.00% 54.00%, 92.50% 54.00%, 92.50% 63.00%, 100.00% 63.00%, 100.00% 72.00%, 100.00% 0.00%); }
.hero-silk { background: var(--do-co) url("/ds/assets/Silk/silk-dai-le.webp") 70% 40% / cover no-repeat; z-index: -2; }
.hero-grain { background: url("/ds/assets/Silk/grain.png") 0 0 / 180px repeat; mix-blend-mode: overlay; opacity: var(--grain-day); z-index: -1; pointer-events: none; }
.hero-in { min-height: min(720px, 86vh); display: grid; align-content: end; padding: 120px 0 72px; }
.hero-copy { max-width: 560px; display: grid; gap: 22px; }
.hero-copy .h1 .hl { display: block; color: var(--do-co); }
.hero-copy .rule { width: 72px; height: 6px; background: var(--vang-sao); }
.for-whom { margin: 0; font-size: 15px; color: var(--ink-muted); max-width: 52ch; }

/* sections */
.sec { padding: 96px 0; }
.sec + .sec { border-top: 1px solid var(--line); }
.sec-head { display: grid; gap: 14px; max-width: 760px; margin-bottom: 48px; }
.sec-raised { background: var(--surface-raised); }
section[id] { scroll-margin-top: 62px; }

/* three steps */
.steps3 { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 2px solid var(--ink); }
.steps3 li { padding: 28px 28px 8px 0; display: grid; gap: 12px; align-content: start; }
.steps3 li + li { padding-left: 28px; border-left: 1px solid var(--line); }
.steps3 .num { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; border: 2px solid var(--ink); font: 800 16px/1 var(--font-display); }
.steps3 li:first-child .num { background: var(--ink); color: var(--surface); }
.steps3 p { margin: 0; color: var(--ink-muted); font-size: 15.5px; }
.steps3 .tag { font: 500 12.5px/1.5 var(--font-mono); color: var(--ink); }

/* illustrative case screen */
.demo-wrap { display: grid; gap: 14px; }
.demo-cap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; align-items: baseline; }
.minh-hoa { display: inline-flex; align-items: center; gap: 6px; font: 700 11px/1 var(--font-label); letter-spacing: .16em; text-transform: uppercase; padding: 6px 8px; border: 1.5px solid var(--ink); border-radius: var(--radius-sm); background: #FFFFFF; }
.screen { border: 1.5px solid var(--ink); border-radius: var(--radius-md); overflow: hidden; background: #FFFFFF; }
.screen-bar { display: flex; align-items: center; gap: 14px; padding: 10px 16px; background: var(--xanh-dem); color: #D6D9E6; font-size: 13px; }
.screen-bar img { height: 20px; width: auto; }
.screen-bar .co { background: var(--xanh-dem-2); color: var(--trang-le-phuc); padding: 4px 10px; border-radius: var(--radius-sm); font-weight: 600; }
.screen-body { display: grid; grid-template-columns: 320px minmax(0, 1fr); }
.s-list { border-right: 1px solid var(--line); }
.s-head { padding: 14px 16px; border-bottom: 1px solid var(--line); display: grid; gap: 8px; }
.s-head b { font: 800 16px/1.25 var(--font-display); text-transform: uppercase; }
.s-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.s-chip { font: 600 12px/1 var(--font-sans); padding: 7px 9px; border: 1.5px solid var(--ink); border-radius: var(--radius-md); }
.s-chip.on { background: var(--ink); color: #FFFFFF; }
.s-row { padding: 12px 16px; border-bottom: 1px solid var(--line); display: grid; gap: 6px; }
.s-row.on { background: var(--trang-le-phuc); }
.s-row-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.s-row-t { font-size: 14px; line-height: 1.4; font-weight: 500; }
.s-row.on .s-row-t { font-weight: 600; }
.s-row-s { font-size: 12px; color: var(--ink-muted); }
.s-when { font: 500 11.5px/1 var(--font-mono); color: var(--ink-muted); }
.s-detail { padding: 22px 26px 26px; display: grid; gap: 18px; align-content: start; }
.s-meta { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; font-size: 13px; color: var(--ink-muted); }
.s-title { margin: 0; font: 600 22px/1.35 var(--font-sans); max-width: 30ch; }
.s-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 26px; }
.s-col { display: grid; gap: 10px; align-content: start; }
.s-col p { margin: 0; font-size: 14px; }
.s-col p.kicker { font-size: 11px; }
.s-ev { margin: 0; border-top: 1px solid var(--line); }
.s-ev div { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--line); }
.s-ev dt { font-size: 12.5px; color: var(--ink-muted); flex: none; }
.s-ev dd { margin: 0; font: 500 12.5px/1.5 var(--font-mono); text-align: right; overflow-wrap: anywhere; min-width: 0; }
.vs-steps { max-width: none; }
.vs-step { padding-bottom: 16px; }
.vs-step-title { font-size: 14.5px; }
.vs-step-detail { font-size: 13px; }
.s-who { margin: 2px 0 0; font: 500 11.5px/1.4 var(--font-mono); color: var(--ink-muted); }
.vs-step-done .vs-step-title { text-decoration: line-through; text-decoration-color: var(--ink-muted); }
.vs-sev { height: 24px; font-size: 12px; }
.vs-sev-info { background: transparent; color: var(--ink-muted); border-color: var(--line); }
.demo-points { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.demo-points li { display: grid; gap: 4px; font-size: 15px; color: var(--ink-muted); }
.demo-points b { color: var(--ink); font-weight: 600; }

/* what it checks */
.checks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 2px solid var(--ink); }
.check { padding: 24px 22px 26px 0; display: grid; gap: 8px; align-content: start; border-bottom: 1px solid var(--line); }
.check:not(:nth-child(3n+1)) { padding-left: 22px; border-left: 1px solid var(--line); }
.check p { margin: 0; font-size: 15px; color: var(--ink-muted); }
.check .src { font: 500 12px/1.5 var(--font-mono); color: var(--ink); }

/* commitment band (night) */
.band { background: var(--xanh-dem); color: var(--trang-le-phuc); position: relative; overflow: hidden; }
.band .kicker { color: #B9BED3; }
.band .h2 .hl { color: var(--vang-sao); }
.band-in { padding: 88px 0; display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 48px; align-items: start; }
.band ul { list-style: none; margin: 0; padding: 0; display: grid; border-top: 1px solid #2C375E; }
.band li { padding: 16px 0; border-bottom: 1px solid #2C375E; display: grid; grid-template-columns: 28px 1fr; gap: 12px; font-size: 16px; }
.band li svg { width: 18px; height: 18px; margin-top: 4px; color: var(--vang-sao); }
.band a.more { color: var(--trang-le-phuc); font-weight: 600; text-underline-offset: 4px; }
.band :focus-visible { outline-color: var(--vang-sao); }

/* closing call */
.cta { padding: 96px 0; }
.cta-in { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 32px; align-items: end; border-top: 2px solid var(--ink); padding-top: 36px; }

/* footer */
.foot { border-top: 1px solid var(--line); padding: 28px 0 36px; font-size: 13.5px; color: var(--ink-muted); }
.foot-in { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 32px; align-items: center; }
.foot img { height: 26px; width: auto; }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }

/* cam kết page */
.doc { padding: 64px 0 88px; }
.doc-in { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 56px; align-items: start; }
.doc-side { position: sticky; top: 100px; display: grid; gap: 16px; }
.doc-side .rule { width: 72px; height: 6px; background: var(--vang-sao); }
.doc-list { list-style: none; margin: 0; padding: 0; counter-reset: c; border-top: 2px solid var(--ink); }
.doc-list > li { counter-increment: c; display: grid; grid-template-columns: 44px 1fr; gap: 6px 16px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.doc-list > li::before { content: counter(c, decimal-leading-zero); font: 800 18px/1.45 var(--font-display); color: var(--ink); }
.doc-list h2 { margin: 0; font: 600 18px/1.45 var(--font-sans); grid-column: 2; }
.doc-list p, .doc-list ul { margin: 0; grid-column: 2; color: var(--ink-muted); font-size: 15.5px; }
.doc-list ul { padding-left: 18px; display: grid; gap: 4px; }
.doc-foot { margin: 22px 0 0; font-size: 13.5px; color: var(--ink-muted); }

/* tablet */
@media (max-width: 1080px) {
  .checks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .check:not(:nth-child(3n+1)) { padding-left: 0; border-left: 0; }
  .check:nth-child(2n) { padding-left: 22px; border-left: 1px solid var(--line); }
  .screen-body { grid-template-columns: 270px minmax(0, 1fr); }
  .s-grid { grid-template-columns: 1fr; }
}
/* phone */
@media (max-width: 760px) {
  .bar nav { display: none; }
  .bar .vs-btn { margin-left: auto; }
  .hero-silk, .hero-grain { inset: 0 0 auto 0; height: 230px; clip-path: polygon(0.00% 100.00%, 16.67% 100.00%, 16.67% 88.33%, 33.33% 88.33%, 33.33% 76.67%, 50.00% 76.67%, 50.00% 65.00%, 66.67% 65.00%, 66.67% 53.33%, 83.33% 53.33%, 83.33% 41.67%, 100.00% 41.67%, 100.00% 30.00%, 100.00% 0.00%, 0.00% 0.00%); }
  .hero-silk { background-position: 60% 50%; }
  .hero-in { min-height: 0; padding: 262px 0 56px; }
  .sec, .cta { padding: 64px 0; }
  .sec-head { margin-bottom: 32px; }
  .steps3 { grid-template-columns: 1fr; }
  .steps3 li, .steps3 li + li { padding: 22px 0; border-left: 0; }
  .steps3 li + li { border-top: 1px solid var(--line); }
  .checks { grid-template-columns: 1fr; }
  .check:nth-child(2n) { padding-left: 0; border-left: 0; }
  .screen-body { grid-template-columns: 1fr; }
  .s-list { border-right: 0; border-bottom: 1.5px solid var(--ink); }
  .s-row.hide-sm { display: none; }
  .s-detail { padding: 18px 16px 20px; }
  .s-title { font-size: 19px; }
  .demo-points { grid-template-columns: 1fr; gap: 14px; }
  .band-in { grid-template-columns: 1fr; gap: 28px; padding: 64px 0; }
  .cta-in { grid-template-columns: 1fr; }
  .doc { padding: 40px 0 64px; }
  .doc-in { grid-template-columns: 1fr; gap: 28px; }
  .doc-side { position: static; }
  .doc-list > li { grid-template-columns: 34px 1fr; }
}