/* =========================================================================
   Apricob Biomedicals Co., Ltd. — one-pager
   Implementation of the Claude Design prototype (project/Apricob Website.dc.html).
   Desktop values are pixel-exact to the prototype; responsive behaviour below
   1080px is additive (the prototype was desktop-only).
   ========================================================================= */

:root {
  /* Surfaces */
  --paper:        #f2f4f3;  /* page background                       */
  --paper-card:   #ffffff;  /* raised card on paper                  */
  --ink:          #141a17;  /* primary text, dark sections           */
  --ink-soft:     #181f1b;  /* raised card inside a dark section     */

  /* Text on paper */
  --text-body:    #38423e;
  --text-muted:   #4a5551;
  --text-mono:    #5d6764;
  --text-faint:   #7c8985;
  --text-label:   #9aa5a0;

  /* Text on ink */
  --on-ink:            #e6ebe8;
  --on-ink-bright:     #f2f4f3;
  --on-ink-body:       #b9c4bf;
  --on-ink-muted:      #98a49e;
  --on-ink-label:      #7f8d87;
  --on-ink-code:       #dfe6e2;

  /* Accent */
  --accent:       #2f6248;  /* forest green, on paper                */
  --accent-mint:  #8fbfa4;  /* accent on ink                         */
  --selection:    #cfe0d6;

  /* Rules */
  --rule:         #d5dbd8;
  --rule-light:   #e4e9e7;
  --rule-strong:  #b9c2be;
  --rule-ink:     #2a332e;

  /* Type */
  --serif: Spectral, Georgia, 'Times New Roman', serif;
  --mono:  'Space Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Layout */
  --gutter: 48px;
  --measure: 1180px;
  --header-h: 62px;
}

/* ── Base ───────────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

::selection { background: var(--selection); }

h1, h2, h3 { text-wrap: pretty; }

figure, dl, dd { margin: 0; }
ol { margin: 0; padding: 0; list-style: none; }
address { font-style: normal; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 12px 20px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.skip-link:focus {
  left: 0;
  color: var(--paper);
  text-decoration: none;
}

/* ── Header ─────────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 32px;
  padding: 18px var(--gutter);
  background: rgba(242, 244, 243, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.brand {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  color: var(--ink);
  white-space: nowrap;
}

/* Both words carry equal weight — no mono-uppercase suffix. */
.brand__name {
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  gap: 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-nav a { color: var(--text-mono); }
.site-nav a.site-nav__contact { color: var(--accent); }
.site-nav a:hover,
.site-nav a.site-nav__contact:hover { color: var(--ink); }

/* ── Section scaffolding ────────────────────────────────────────────────── */

.section {
  padding: 96px var(--gutter);
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: var(--header-h);
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
}

.split {
  display: grid;
  gap: 80px;
}

.split--verification,
.split--analysis { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); }
.split--analysis  { align-items: start; }
.split--contact   { grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); align-items: end; }

/* Small monospace label above a block. */
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 22px;
}
.eyebrow--accent { color: var(--accent); }
.eyebrow--mint   { color: var(--accent-mint); }

/* A section heading that reads as a label rather than a title. */
.section__kicker {
  margin: 0 0 48px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-mono);
}

.section__title {
  margin: 0 0 26px;
  font-size: 42px;
  line-height: 1.15;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.section__title--onDark { color: var(--on-ink-bright); }

.prose {
  margin: 0 0 20px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-body);
}
.prose--last   { margin-bottom: 0; }
.prose--onDark { color: var(--on-ink-body); }

/* Uppercase label inside a bordered card. */
.card__label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-label);
  margin-bottom: 24px;
}

/* ── Hero ───────────────────────────────────────────────────────────────── */

.hero { padding: 120px var(--gutter) 96px; }

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 72px;
  align-items: end;
}

.hero__eyebrow { margin: 0 0 36px; }

.hero__title {
  margin: 0;
  font-size: 68px;
  line-height: 1.06;
  font-weight: 400;
  letter-spacing: -0.015em;
}

.hero__lead {
  margin: 32px 0 0;
  max-width: 40em;
  font-size: 19px;
  line-height: 1.65;
  color: var(--text-body);
  text-wrap: pretty;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

.btn {
  display: inline-block;
  padding: 13px 26px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background-color 120ms ease, border-color 120ms ease;
}
.btn:hover { text-decoration: none; }

.btn--solid {
  background: var(--ink);
  color: var(--paper);
}
.btn--solid:hover {
  background: var(--accent);
  color: var(--paper);
}

.btn--outline {
  border: 1px solid var(--rule-strong);
  color: var(--ink);
}
.btn--outline:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* Hairline-ruled column of company facts beside the hero. */
.factbox {
  border-left: 1px solid var(--rule);
  padding-left: 32px;
  display: flex;
  flex-direction: column;
  gap: 26px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.75;
  color: var(--text-mono);
}

.factbox__label {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-label);
  margin-bottom: 8px;
}

.factbox__value { color: var(--ink); }

/* ── Practice areas ─────────────────────────────────────────────────────── */

.practice { padding: 88px var(--gutter); }

/* 1px gap over a rule-coloured background draws the hairline grid. */
.practice__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.practice__cell {
  background: var(--paper);
  padding: 30px 26px 34px;
}

.practice__num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 20px;
}

.practice__heading {
  margin: 0 0 12px;
  font-size: 21px;
  font-weight: 500;
  line-height: 1.25;
}

.practice__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-muted);
}

/* ── Formal verification ────────────────────────────────────────────────── */

.verification__aside {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.method {
  border: 1px solid var(--rule);
  background: var(--paper-card);
  padding: 30px 32px 34px;
}

.method__row {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 18px;
  padding: 14px 0;
  border-top: 1px solid var(--rule-light);
}

.method__mark {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
}

.method__title {
  font-size: 16px;
  font-weight: 500;
}

.method__desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-mono);
  margin-top: 4px;
}

/* Dark specification card. */
.obligation {
  border: 1px solid var(--rule);
  background: var(--ink);
  color: var(--on-ink-code);
  padding: 26px 32px 30px;
  font-family: var(--mono);
}

.obligation__label {
  color: var(--on-ink-label);
  margin-bottom: 16px;
}

.obligation__body {
  font-size: 13px;
  line-height: 1.9;
}

.obligation__kw     { color: var(--on-ink-label); }
.obligation__indent { padding-left: 22px; }
.obligation__gap    { margin-top: 12px; }

.obligation__status {
  margin-top: 16px;
  color: var(--accent-mint);
}

/* ── AI-assisted symbolic analysis (dark) ───────────────────────────────── */

.analysis {
  background: var(--ink);
  color: var(--on-ink);
  border-bottom: 0;
}

/* Same 1px-gap hairline technique, inverted. */
.pipeline {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--rule-ink);
  border: 1px solid var(--rule-ink);
}

.pipeline__step {
  background: var(--ink-soft);
  padding: 24px 30px;
}

.pipeline__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.pipeline__num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-mint);
}

.pipeline__title {
  font-size: 17px;
  font-weight: 500;
  color: var(--on-ink-bright);
}

.pipeline__body {
  margin: 8px 0 0 27px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--on-ink-muted);
}

/* ── Team ───────────────────────────────────────────────────────────────── */

.team__kicker { margin-bottom: 44px; }

.bio { padding-top: 0; }

.bio__name {
  margin: 0;
  font-size: 34px;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.bio__nameZh {
  font-size: 20px;
  color: var(--text-mono);
  margin-left: 14px;
}

.bio__role {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 12px;
}

.bio__prose {
  max-width: 44em;
  margin-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-body);
}
.bio__prose p { margin: 0; }

.bio__facts {
  margin-top: 32px;
  border-top: 1px solid var(--rule);
  padding-top: 20px;
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 14px 24px;
  font-size: 16px;
}

.bio__factLabel {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-label);
  padding-top: 4px;
}

.bio__factValue { color: var(--text-body); }

/* Every member gets the same entry — no portraits, no lead-and-subordinates
   hierarchy. A rule separates equals; it does not rank them. */
.team__roster {
  list-style: none;
  margin: 0;
  padding: 0;
}

.bio + .bio {
  border-top: 1px solid var(--rule);
  margin-top: 48px;
  padding-top: 48px;
}

/* ── Contact ────────────────────────────────────────────────────────────── */

.contact {
  padding: 96px var(--gutter) 40px;
  border-bottom: 0;
}

.contact__title {
  margin: 0 0 22px;
  font-size: 40px;
  line-height: 1.15;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.contact__lead {
  margin: 0;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-body);
}

.contact__details {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.9;
  color: var(--text-body);
}

.contact__label { margin-bottom: 12px; }

.contact__address {
  margin-top: 18px;
  color: var(--text-mono);
}

/* ── Footer ─────────────────────────────────────────────────────────────── */

.site-footer {
  padding: 32px var(--gutter) 44px;
  border-top: 1px solid var(--rule);
  margin: 48px var(--gutter) 0;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

/* =========================================================================
   Responsive — additive; the prototype defined desktop only.
   ========================================================================= */

@media (max-width: 1080px) {
  .hero__title    { font-size: 54px; }
  .section__title { font-size: 36px; }
  .contact__title { font-size: 34px; }

  .hero__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  /* The rail's left rule becomes a top rule once it stacks. */
  .factbox {
    border-left: 0;
    border-top: 1px solid var(--rule);
    padding-left: 0;
    padding-top: 28px;
  }

  .practice__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .split--verification,
  .split--analysis,
  .split--contact {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

@media (max-width: 960px) {
  .site-nav { gap: 18px; }
}

@media (max-width: 720px) {
  :root { --gutter: 24px; }

  .site-header {
    gap: 16px;
    padding: 14px var(--gutter);
  }

  /* Keep the sticky bar one line tall; overflow scrolls instead of wrapping. */
  .site-nav {
    flex: 1 1 auto;
    justify-content: flex-start;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .site-nav::-webkit-scrollbar { display: none; }
  .site-nav a { white-space: nowrap; }

  .section   { padding: 64px var(--gutter); }
  .hero      { padding: 72px var(--gutter) 64px; }
  .practice  { padding: 64px var(--gutter); }
  .contact   { padding: 64px var(--gutter) 32px; }

  .hero__title    { font-size: 40px; }
  .hero__lead     { font-size: 17px; }
  .section__title { font-size: 30px; }
  .contact__title { font-size: 28px; }
  .section__kicker { margin-bottom: 32px; }
  .team__kicker    { margin-bottom: 32px; }

  .practice__grid { grid-template-columns: minmax(0, 1fr); }

  .method     { padding: 24px 22px 28px; }
  .obligation { padding: 22px 22px 26px; }

  .method__row {
    grid-template-columns: 28px 1fr;
    gap: 12px;
  }

  .pipeline__step { padding: 20px 22px; }

  .bio__facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .site-footer {
    margin: 32px var(--gutter) 0;
    padding: 24px 0 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}