/* =====================================================================
   Landing surface — Vietnamese clinical print.

   The `--p-*` tokens and the dark-scheme overrides used to be defined here,
   scoped under `.landing`, so that /kham-song-ngu/ would keep rendering in
   the old teal system. That scoping was right for one demo and is debt now:
   the two surfaces are one product. The tokens live in styles.css `:root`
   and this file only composes with them.

   Kept local because they are about this surface's composition, not the
   world: the document figure, the committed field, the results table.
   ===================================================================== */

.landing {
  background: var(--p-paper);
  color: var(--p-ink);
  font-feature-settings: "tnum" 0;
}

/* --- type ------------------------------------------------------------ */

.landing h1,
.landing h2,
.landing h3 {
  margin: 0;
}

/* Sized to the column it actually sits in, not to the viewport. The headline is
   66 Vietnamese characters; at the old 5.75rem it ran to seven lines in a
   580px column, which is not display type, it is a paragraph in disguise. */
/* Leading is set by Vietnamese ink, not by Latin display-type habit. Measured in
   Be Vietnam Pro 800: the worst descender in this headline is `ệ` at 10px below
   the baseline, and the worst stacked ascender is `ấ` at 35px above it. Two
   lines therefore need 45px of advance, which is 1.172 at any size.
   `line-height: 0.94` gave 36px and overlapped by 8.9px — on a six-line
   Vietnamese headline that is a collision, not tight tracking. 1.18 clears it
   with a little to spare and still reads as display type. Do not lower this
   without re-measuring: a value that looks fine in English breaks here. */
.landing h1 {
  font-size: clamp(2.4rem, 4.6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.18;
}

.landing h2 {
  font-size: clamp(1.85rem, 3.6vw, 3.1rem);
  font-weight: 800;
  letter-spacing: -0.028em;
  line-height: 1.18;
  max-width: 22ch;
}

.landing h3 {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.landing p {
  margin: 0;
}

/* The form label: every official Vietnamese document has these. */
.p-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--p-ink-faint);
}

.p-lede {
  max-width: var(--p-measure);
  font-size: clamp(1.02rem, 1.5vw, 1.2rem);
  line-height: 1.62;
  color: var(--p-ink-soft);
}

.landing section {
  scroll-margin-top: 4.5rem;
}

.p-wrap {
  width: min(100% - 2.5rem, 78rem);
  margin-inline: auto;
}

/* --- nav ------------------------------------------------------------- */

.p-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem max(1.25rem, calc((100vw - 78rem) / 2));
  background: var(--p-blue);
  color: var(--p-on-blue);
  border-bottom: 3px solid var(--p-seal);
}

.p-nav__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: inherit;
  text-decoration: none;
}

.p-nav__brand img {
  width: 1.6rem;
  height: 1.6rem;
  filter: brightness(0) invert(1);
}

.p-nav__links {
  display: flex;
  gap: 1.25rem;
  margin-left: 1.5rem;
}

.p-nav__links a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--p-on-blue-soft);
  text-decoration: none;
  padding-block: 0.25rem;
  border-bottom: 2px solid transparent;
}

.p-nav__links a:hover {
  color: var(--p-on-blue);
  border-bottom-color: var(--p-seal);
}

.p-nav__end {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-left: auto;
}

.p-lang {
  padding: 0.3rem 0.6rem;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--p-on-blue);
  background: transparent;
  border: 1px solid var(--p-on-blue-soft);
  cursor: pointer;
}

.p-lang:hover {
  border-color: var(--p-on-blue);
}

.p-cta {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.55rem 1.15rem;
  font-weight: 700;
  font-size: 0.92rem;
  text-decoration: none;
  color: var(--p-paper);
  background: var(--p-seal);
  border: 2px solid var(--p-seal);
}

.p-cta:hover {
  background: var(--p-seal-ink);
  border-color: var(--p-seal-ink);
}

.p-cta--ghost {
  color: var(--p-ink);
  background: transparent;
  border-color: var(--p-ink);
}

.p-cta--ghost:hover {
  color: var(--p-paper);
  background: var(--p-ink);
}

.p-nav .p-cta {
  min-height: 2.25rem;
  padding-block: 0.35rem;
}

/* No hamburger: the links wrap to their own scrollable row. A JS menu for four
   anchors is more code and one more thing to get wrong on a phone. */
@media (max-width: 60rem) {
  .p-nav {
    flex-wrap: wrap;
    row-gap: 0.5rem;
  }

  .p-nav__links {
    order: 3;
    width: 100%;
    margin-left: 0;
    gap: 1rem;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .p-nav__links::-webkit-scrollbar {
    display: none;
  }

  .p-nav__links a {
    white-space: nowrap;
  }
}

/* --- the document: the first viewport -------------------------------- */

.p-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: var(--p-gutter);
  align-items: start;
  /* Held down deliberately: the whole hero, document included, has to fit a
     1440x800 laptop so the primary action never needs a scroll. */
  padding-block: clamp(1.75rem, 3.2vw, 2.75rem);
}

@media (max-width: 64rem) {
  .p-hero {
    grid-template-columns: 1fr;
  }
}

/* Sticky only where there is a second column to stay beside. In one column it
   would pin the headline over the document the visitor is trying to read. */
@media (min-width: 64.0625rem) {
  .p-hero__claim {
    position: sticky;
    top: 5.5rem;
  }
}

.p-hero h1 em {
  font-style: normal;
  color: var(--p-seal);
}

.p-hero__body {
  margin-top: 1.4rem;
  max-width: 46ch;
  font-size: clamp(1rem, 1.4vw, 1.14rem);
  line-height: 1.6;
  color: var(--p-ink-soft);
}

.p-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.8rem;
}

.p-hero__doc {
  display: grid;
  gap: 0.65rem;
}

/* The prescription itself, rendered as the object it is. */
.p-doc {
  --doc-pad: clamp(1rem, 2.2vw, 1.75rem);
  /* figure's UA margin is 1em 40px, which indented the document by 80px. */
  margin: 0;
  background: var(--p-paper);
  border: var(--p-rule-strong);
  box-shadow: 0.45rem 0.45rem 0 var(--p-blue-tint);
}

.p-doc__head {
  padding: var(--doc-pad) var(--doc-pad) 0.85rem;
  border-bottom: var(--p-rule-strong);
  text-align: center;
}

.p-doc__org {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--p-ink-faint);
}

.p-doc__title {
  display: block;
  margin-top: 0.3rem;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.p-doc__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem 1.1rem;
  margin-top: 0.45rem;
  font-size: 0.78rem;
  color: var(--p-ink-faint);
}

.p-doc__rows {
  margin: 0;
  padding: 0;
  list-style: none;
}

.p-row {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0 0.75rem;
  padding: 0.72rem var(--doc-pad);
  border-bottom: var(--p-rule);
}

.p-row:last-child {
  border-bottom: 0;
}

.p-row__no {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--p-ink-faint);
  padding-top: 0.1rem;
}

.p-row__vi {
  /* 700, not 600: font-synthesis is none and 600 is not among the loaded
     weights, so it silently resolved to something else. */
  font-weight: 700;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

/* The mechanism, performed: English resolves beneath the Vietnamese. */
.p-row__en {
  display: block;
  margin-top: 0.3rem;
  padding-left: 0.7rem;
  border-left: 2px solid var(--p-blue);
  font-size: 0.94rem;
  line-height: 1.45;
  color: var(--p-blue);
  overflow-wrap: anywhere;
}

@media (prefers-color-scheme: dark) {
  .p-row__en {
    color: #9cc0ee;
    border-left-color: #9cc0ee;
  }
}

/* The one authored motion moment: the English resolves under each Vietnamese
   line, in reading order, once. It is the product's mechanism performed — not
   decoration, and not repeated anywhere else on the page. */
/* Deliberately no opacity: the text is at its final colour on every frame, so
   the wipe cannot produce a half-blended foreground. axe samples whenever it
   samples, and a fading string reads as a contrast failure while it fades. */
@keyframes p-resolve {
  from {
    translate: 0 -0.4rem;
    clip-path: inset(0 100% 0 0);
  }
  to {
    translate: 0 0;
    clip-path: inset(0 0 0 0);
  }
}

.p-row__en {
  animation: p-resolve 620ms cubic-bezier(0.2, 0.7, 0.3, 1) both;
  animation-delay: calc(240ms + var(--i, 0) * 190ms);
}

@media (prefers-reduced-motion: reduce) {
  /* Not a faster animation — none. The shared reduce block only collapses
     duration, and a 0.01ms animation still reports as running until the first
     frame ticks. Reduced motion should mean the line is simply already there. */
  .p-row__en {
    animation: none !important;
  }
}

.p-doc__foot {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem var(--doc-pad);
  border-top: var(--p-rule-strong);
  background: var(--p-paper-2);
  font-size: 0.82rem;
  color: var(--p-ink-soft);
}

/* The seal. Every Vietnamese official document carries one. */
.p-seal {
  flex: none;
  display: grid;
  place-items: center;
  width: 4.1rem;
  height: 4.1rem;
  padding: 0.3rem;
  border: 2px solid var(--p-seal);
  border-radius: 50%;
  color: var(--p-seal);
  font-size: 0.52rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.04em;
  text-align: center;
  text-transform: uppercase;
  rotate: -8deg;
}

/* --- a field the page commits to ------------------------------------- */

.p-field {
  background: var(--p-blue);
  color: var(--p-on-blue);
}

.p-field h2 {
  color: var(--p-on-blue);
}

.p-field .p-lede {
  color: var(--p-on-blue-soft);
}

.p-field .p-label {
  color: var(--p-on-blue-soft);
}

.p-section {
  padding-block: clamp(2.5rem, 4.5vw, 4.25rem);
}

.p-section__head {
  display: grid;
  gap: 0.9rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

/* --- the comparison: two figures, not three equal cards -------------- */

.p-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 2px solid var(--p-on-blue-soft);
}

@media (max-width: 44rem) {
  .p-compare {
    grid-template-columns: 1fr;
  }
}

.p-compare__side {
  padding: 1.5rem 1.5rem 1.75rem 0;
}

.p-compare__side + .p-compare__side {
  padding-left: 1.5rem;
  border-left: 1px solid var(--p-on-blue-soft);
}

@media (max-width: 44rem) {
  .p-compare__side + .p-compare__side {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--p-on-blue-soft);
  }
}

.p-compare__fig {
  display: block;
  /* Large, but never larger than the headline — the h1 stays the biggest type
     on the page, and an e2e assertion holds that. */
  font-size: clamp(2.8rem, 7vw, 3.6rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.045em;
  font-variant-numeric: tabular-nums;
}

.p-compare__side--base .p-compare__fig {
  color: var(--p-on-blue-soft);
}

/* The seal colour, on the number that is the reason the product exists. */
.p-compare__side--risk .p-compare__fig {
  color: #ff9a86;
}

.p-compare__cap {
  display: block;
  margin-top: 0.6rem;
  max-width: 30ch;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--p-on-blue-soft);
}

.p-note {
  margin-top: 1.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--p-on-blue-soft);
  max-width: var(--p-measure);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--p-on-blue-soft);
}

.p-note b {
  color: var(--p-on-blue);
  font-weight: 700;
}

/* The citation for the comparison above. Journal convention: hanging indent,
   quieter than the notes, and it never wraps into the figure it credits. */
.p-cite {
  margin-top: 1.25rem;
  max-width: var(--p-measure);
  padding-left: 1.5rem;
  text-indent: -1.5rem;
  font-size: 0.78rem;
  line-height: 1.55;
  letter-spacing: 0.005em;
  color: var(--p-on-blue-soft);
}

/* --- the three moments: a timeline, ruled like a form ----------------- */

.p-moments {
  counter-reset: p-moment;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  border-top: var(--p-rule-strong);
}

.p-moments li {
  counter-increment: p-moment;
  padding: 1.35rem 1.25rem 1.5rem 0;
  border-bottom: var(--p-rule);
}

.p-moments li + li {
  padding-left: 1.25rem;
  border-left: var(--p-rule);
}

/* The ordinal carries the sequence; the heading carries the moment. */
.p-moments h3::before {
  content: counter(p-moment);
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--p-seal-ink);
}

.p-moments h3 {
  margin: 0 0 0.5rem;
}

.p-moments p {
  max-width: 34ch;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--p-ink-soft);
}

.p-moments__note {
  margin-top: 1.25rem;
  padding-left: 0.9rem;
  border-left: 3px solid var(--p-seal);
  max-width: var(--p-measure);
  font-weight: 600;
  line-height: 1.6;
}

/* --- try it: three doors into the demo, on the committed field -------- */

.p-try {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  border-top: 2px solid var(--p-on-blue-soft);
}

.p-try li {
  padding: 1.25rem 1.25rem 1.4rem 0;
  border-bottom: 1px solid var(--p-on-blue-soft);
}

.p-try li + li {
  padding-left: 1.25rem;
  border-left: 1px solid var(--p-on-blue-soft);
}

.p-try h3 {
  margin: 0 0 0.45rem;
  color: var(--p-on-blue);
}

.p-try p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--p-on-blue-soft);
}

.p-try__cta {
  margin-top: 1.75rem;
}

@media (max-width: 40rem) {
  .p-moments li + li,
  .p-try li + li {
    padding-left: 0;
    border-left: 0;
  }
}

/* --- mechanism: numbered like a procedure ---------------------------- */

.p-steps {
  counter-reset: p-step;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 0;
  border-top: var(--p-rule-strong);
}

.p-steps li {
  counter-increment: p-step;
  padding: 1.15rem 1.25rem 1.5rem 0;
  border-right: var(--p-rule);
  list-style: none;
}

.p-steps li:last-child {
  border-right: 0;
}

@media (max-width: 52rem) {
  .p-steps li {
    padding-right: 0;
    border-right: 0;
    border-bottom: var(--p-rule);
  }
  .p-steps li:last-child {
    border-bottom: 0;
  }
}

.p-steps li::before {
  content: counter(p-step, decimal-leading-zero);
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--p-seal);
}

.p-steps p {
  margin-top: 0.4rem;
  max-width: 34ch;
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--p-ink-soft);
}

/* --- evidence: a results table, not cards ---------------------------- */

.p-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.p-table caption {
  caption-side: top;
  padding-bottom: 0.7rem;
  text-align: left;
  font-size: 0.8rem;
  color: var(--p-ink-faint);
}

.p-table th,
.p-table td {
  padding: 0.7rem 0.9rem 0.7rem 0;
  text-align: left;
  border-bottom: var(--p-rule);
  vertical-align: baseline;
}

.p-table thead th {
  border-bottom: var(--p-rule-strong);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--p-ink-faint);
}

.p-table tbody th {
  font-weight: 600;
}

.p-table td:last-child {
  padding-right: 0;
  color: var(--p-ink-soft);
  font-size: 0.92rem;
  line-height: 1.5;
}

.p-figure {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.p-limits {
  margin-top: 2rem;
  padding: 1.1rem 1.25rem;
  border: var(--p-rule);
  border-left: 4px solid var(--p-seal);
  background: var(--p-seal-tint);
  max-width: var(--p-measure);
}

.p-limits h3 {
  color: var(--p-seal-ink);
}

.p-limits ul {
  margin: 0.6rem 0 0;
  padding-left: 1.1rem;
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--p-ink-soft);
}

/* --- boundaries ------------------------------------------------------ */

.p-refuse {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--p-rule-strong);
}

.p-refuse li {
  padding: 1.1rem 1.25rem 1.4rem 0;
  border-right: var(--p-rule);
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--p-ink-soft);
}

.p-refuse li:last-child {
  border-right: 0;
}

.p-refuse li::before {
  content: "✕";
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--p-seal);
}

@media (max-width: 52rem) {
  .p-refuse li {
    padding-right: 0;
    border-right: 0;
    border-bottom: var(--p-rule);
  }
  .p-refuse li:last-child {
    border-bottom: 0;
  }
}

/* --- start ----------------------------------------------------------- */

.p-start {
  display: grid;
  gap: 1.4rem;
  justify-items: start;
}

.p-start__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.p-field .p-cta--ghost {
  color: var(--p-on-blue);
  border-color: var(--p-on-blue-soft);
}

.p-field .p-cta--ghost:hover {
  color: var(--p-blue);
  background: var(--p-on-blue);
}

.p-pilot {
  width: 100%;
  margin-top: 0.5rem;
}

.p-pilot > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.94rem;
  color: var(--p-on-blue);
}

.p-pilot > div {
  margin-top: 1rem;
  padding: 1.25rem;
  background: var(--p-paper);
  color: var(--p-ink);
  border: var(--p-rule-strong);
}

/* --- footer ---------------------------------------------------------- */

.p-foot {
  padding: 2.25rem max(1.25rem, calc((100vw - 78rem) / 2));
  border-top: 3px solid var(--p-seal);
  background: var(--p-blue-deep);
  color: var(--p-on-blue);
  display: grid;
  gap: 0.75rem;
}

.p-foot strong {
  font-size: 1.02rem;
  font-weight: 700;
}

.p-foot p {
  max-width: var(--p-measure);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--p-on-blue-soft);
}

.p-foot a {
  color: var(--p-on-blue);
  text-underline-offset: 0.2em;
}

.p-foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.88rem;
}

/* --- focus: the base sheet enumerates selectors, so name ours -------- */

.landing a:focus-visible,
.landing button:focus-visible,
.landing summary:focus-visible,
.landing input:focus-visible,
.landing textarea:focus-visible,
.landing select:focus-visible {
  outline: 3px solid var(--p-seal);
  outline-offset: 2px;
}

.p-nav a:focus-visible,
.p-nav button:focus-visible {
  outline-color: var(--p-on-blue);
}