/* ============================================================================
   Mynavi TechTus Vietnam — v2 home page styles
   Ported from 05-mockups/v2/{vi,jp}/index.html <style> + inline styles.
   Token-only: colours/sizes/spacing/radius/duration use design-system tokens.
   Raw values allowed: rgba() overlays + structural dimensions with no token.
   ============================================================================ */

/* ---------------------------------------------------------------------------
   1. CLIENT MARQUEE
   --------------------------------------------------------------------------- */
.client-marquee { overflow: hidden; }
.client-marquee__label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-eyebrow-lg);
  text-align: center;
  color: var(--c-ink-4);
}
.client-marquee__mask {
  margin-top: var(--sp-8);
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, rgba(0, 0, 0, 1) 8%, rgba(0, 0, 0, 1) 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, rgba(0, 0, 0, 1) 8%, rgba(0, 0, 0, 1) 92%, transparent);
}
.client-track {
  display: flex;
  align-items: center;
  gap: var(--sp-18);
  width: max-content;
  padding-right: var(--sp-18);
  animation: client-scroll 45s linear infinite;
}
@keyframes client-scroll {
  to { transform: translateX(-50%); }
}
.client-logo {
  height: var(--sp-10);
  width: auto;
  max-width: 160px;
  object-fit: contain;
  flex: none;
  filter: grayscale(1);
  opacity: .65;
  transition: filter var(--dur-4) var(--ease), opacity var(--dur-4) var(--ease);
}
.client-logo:hover { filter: grayscale(0); opacity: 1; }
.client-track:has(.client-logo:hover) { animation-play-state: paused; }

@media (prefers-reduced-motion: reduce) {
  .client-track { animation: none; flex-wrap: wrap; width: auto; justify-content: center; }
}

/* ---------------------------------------------------------------------------
   2. BRAND LOCKUP (philosophy statement + Tech × AucTus)
   --------------------------------------------------------------------------- */
.brand-lockup {
  flex: 1 1 610px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-10);
}
.brand-lockup__media-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-8);
  align-items: flex-end;
}
.techtus-lockup {
  --p: 0;
  --mix: min(var(--p) / .45, 1);
  --fade: min(max((var(--p) - .45) / .55, 0), 1);
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  max-width: 100%;
  overflow: hidden;
  font-size: clamp(64px, 7vw, 80px);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-none);
  letter-spacing: var(--ls-tight);
  color: color-mix(in srgb, var(--c-cyan) calc(var(--mix) * 100%), var(--c-ink));
}
.techtus-mid {
  min-width: 0;
  max-width: calc(4em * (1 - var(--fade)));
  overflow: hidden;
  white-space: nowrap;
  opacity: calc(1 - var(--fade));
  transform: scale(calc(1 - var(--fade) * .999));
  color: color-mix(in srgb, var(--c-line-strong) calc(var(--mix) * 100%), var(--c-ink));
}
.brand-lockup__statement {
  margin: 0;
  font-size: var(--fs-3xl);
  font-weight: var(--fw-medium);
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-tight);
}
.brand-lockup__img {
  flex: 1 1 320px;
  min-width: 0;
  width: 100%;
  max-width: 380px;
  height: 230px;
  object-fit: cover;
  border-radius: var(--r-lg);
}
.brand-lockup__note {
  flex: 1 1 220px;
  margin: 0;
  padding-bottom: var(--sp-5);
  border-bottom: var(--border-hairline);
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
  color: var(--c-ink-3);
}

/* ---------------------------------------------------------------------------
   3. STATS
   --------------------------------------------------------------------------- */
.stats-grid {
  flex: 1 1 380px;
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.stat-item:nth-child(1) {
  border-left: var(--border-hairline);
  padding: 0 0 var(--sp-9) var(--sp-7);
}
.stat-item:nth-child(n+2) {
  border-bottom: var(--border-hairline);
  padding: var(--sp-9) 0 var(--sp-6);
}
.stat-item:nth-child(3) { margin-left: clamp(0px, 12vw, 160px); }
.stat-item:nth-child(4) { border-bottom: 0; padding: var(--sp-9) 0 0; }

/* ---------------------------------------------------------------------------
   4. SOLUTIONS
   --------------------------------------------------------------------------- */
.solutions { display: flex; flex-direction: column; }
.solution-row {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--sp-8);
  padding: var(--sp-10) 0;
  border-top: 1px solid var(--c-line-strong);
}
.solution-number {
  font-size: 96px;
  font-weight: var(--fw-light);
  letter-spacing: var(--ls-tight);
  line-height: var(--lh-none);
  color: var(--c-muted);
}
.solution-row__label {
  display: block;
  font-size: var(--fs-2xs);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-eyebrow);
}
.solution-row__task .solution-row__label { color: var(--c-danger); }
.solution-row__solution .solution-row__label { color: var(--c-cyan); }
.solution-row h3 {
  margin: var(--sp-3) 0 var(--sp-2);
  font-size: var(--fs-2xl);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-normal);
}
.solution-row p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
  color: var(--c-ink-3);
}
.solution-row__task-note {
  margin-top: var(--sp-4);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--c-ink-4);
}
.solution-row__solution.is-highlight {
  background: var(--c-cyan);
  color: var(--c-on-dark);
  border-radius: var(--r-xl);
  padding: var(--sp-8);
}
.solution-row__solution.is-highlight .solution-row__label { color: var(--c-on-dark-2); }
.solution-row__solution.is-highlight p { color: var(--c-on-dark); }

/* ---------------------------------------------------------------------------
   5. AI COLUMNS
   --------------------------------------------------------------------------- */
.ai-columns {
  display: flex;
  flex-wrap: wrap;
  border-top: 1px solid var(--c-ink);
}
.ai-column {
  flex: 1 1 440px;
  min-width: 0;
  padding: var(--sp-10) var(--sp-12) 0 0;
  box-sizing: border-box;
}
.ai-column + .ai-column {
  padding: var(--sp-10) 0 0 var(--sp-12);
  border-left: var(--border-hairline);
}
.ai-column__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.ai-column__head h3 {
  margin: 0;
  font-size: var(--fs-3xl);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-normal);
}
.ai-column__head span { font-size: var(--fs-xs); color: var(--c-ink-4); }
.ai-column__items {
  margin-top: var(--sp-8);
  display: flex;
  flex-direction: column;
}
.ai-item {
  display: flex;
  gap: var(--sp-5);
  padding: var(--sp-5) 0;
  border-top: var(--border-hairline);
}
.ai-item__no {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--c-cyan);
  width: var(--sp-6);
  flex: none;
}
.ai-item h4 { font-size: var(--fs-lg); font-weight: var(--fw-medium); }
.ai-item p { margin: var(--sp-2) 0 0; font-size: var(--fs-sm); line-height: 1.8; color: var(--c-ink-3); }
.ai-column__foot {
  display: flex;
  align-items: flex-end;
  gap: var(--sp-5);
  padding: var(--sp-8) 0 var(--sp-2);
  border-top: var(--border-hairline);
}
.ai-column__metric {
  font-size: clamp(64px, 7vw, 92px);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-tighter);
  line-height: .9;
  color: var(--c-ink);
}
.ai-column:first-child .ai-column__metric { color: var(--c-cyan); }
.ai-column__foot > span:last-child {
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--c-ink-3);
  padding-bottom: var(--sp-1);
}

/* ---------------------------------------------------------------------------
   6. EXPERTISE
   --------------------------------------------------------------------------- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0 var(--sp-8);
}
.expertise-item {
  position: relative;
  border-top: 1px solid var(--c-ink);
  padding: var(--sp-6) 0 var(--sp-8);
}
.expertise-item::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 350ms var(--ease);
}
.expertise-item:hover::after { transform: scaleX(1); }
.expertise-item__num { font-size: var(--fs-xs); font-weight: var(--fw-semibold); color: var(--c-cyan); }
.expertise-item h3 {
  margin: var(--sp-9) 0 var(--sp-3);
  font-size: var(--fs-2xl);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-normal);
}
.expertise-item p { margin: 0; font-size: var(--fs-sm); line-height: var(--lh-relaxed); color: var(--c-ink-3); }
.expertise .expertise__footnote {
  margin: var(--sp-6) 0 0;
  padding-top: var(--sp-5);
  border-top: var(--border-hairline);
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--c-ink-3);
}

/* ---------------------------------------------------------------------------
   7. STANDARDS
   --------------------------------------------------------------------------- */
.sec-standards { padding: 0 var(--gutter) var(--sec-y-lg); }
.standards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  border-top: 1px solid var(--c-ink);
  border-bottom: var(--border-hairline);
}
.standard-item { padding: var(--sp-7) var(--sp-5) var(--sp-7) 0; }
.standard-item + .standard-item { padding-left: var(--sp-5); border-left: var(--border-hairline); }
.standard-item__code {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-normal);
}
.standard-item__sub { margin-top: 6px; font-size: var(--fs-xs); color: var(--c-ink-4); }

/* ---------------------------------------------------------------------------
   8. VOICE
   --------------------------------------------------------------------------- */
.voice-section { padding: 0 var(--gutter) var(--sec-y-lg); }
.voice {
  max-width: var(--container);
  margin: 0 auto;
  background: var(--c-cyan);
  color: var(--c-on-dark);
  border-radius: var(--r-2xl);
  padding: clamp(32px, 6vw, 72px);
  box-sizing: border-box;
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-14);
}
.voice .eyebrow { color: var(--c-cyan-line); }
.voice__intro {
  flex: 1 1 300px;
  min-width: 0;
  align-self: flex-start;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--sp-8);
}
.voice__intro h2 {
  margin: var(--sp-5) 0 var(--sp-4);
  font-size: var(--fs-5xl);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
}
.voice__intro p { margin: 0; font-size: var(--fs-base); line-height: var(--lh-relaxed); color: var(--c-on-dark); }
.voice__nav { display: flex; gap: var(--sp-3); }
.voice__btn {
  width: var(--control-md);
  height: var(--control-md);
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .45);
  background: transparent;
  color: var(--c-on-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.voice__btn:last-child { border: none; background: var(--c-on-dark); color: var(--c-cyan); }
.voice__panel {
  flex: 1.6 1 460px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-10);
}
.voice__mark {
  font-size: 96px;
  line-height: .6;
  font-weight: var(--fw-medium);
  height: var(--sp-10);
}
.voice__quote {
  margin: 0;
  font-size: clamp(22px, 2.5vw, 30px);
  font-weight: var(--fw-regular);
  line-height: 1.65;
  letter-spacing: var(--ls-normal);
  text-align: justify;
}
.voice__who {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding-top: var(--sp-7);
  border-top: 1px solid rgba(255, 255, 255, .2);
}
.voice__avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--c-on-dark);
  color: var(--c-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
}
.voice__who > div > div:first-child { font-size: var(--fs-lg); font-weight: var(--fw-semibold); }
.voice__who > div > div:last-child { margin-top: var(--sp-1); font-size: var(--fs-xs); color: var(--c-on-dark-2); }

/* ---------------------------------------------------------------------------
   9. OFFICES (text grid)
   --------------------------------------------------------------------------- */
.offices { padding: var(--sec-y-lg) var(--gutter); }
.offices .section-head__leadwrap {
  flex-basis: 570px;
}
.office-text-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0 var(--sp-8);
}
.office-cell {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--c-ink);
  padding-top: var(--sp-6);
}
.office-cell__pill {
  align-self: flex-start;
  background: var(--c-cyan);
  color: var(--c-on-dark);
  border-radius: var(--r-pill);
  padding: var(--sp-1) var(--sp-3);
  font-size: var(--fs-2xs);
  font-weight: var(--fw-semibold);
}
.office-cell h3 {
  margin: var(--sp-6) 0 10px;
  font-size: var(--fs-3xl);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-normal);
}
.office-cell p { margin: 0; flex: 1; font-size: var(--fs-sm); line-height: 1.8; color: var(--c-ink-3); }
.office-cell__note { margin-top: var(--sp-5); font-size: var(--fs-sm); color: var(--c-ink-4); }

/* ---------------------------------------------------------------------------
   9b. SECTION LAYOUT WRAPPERS (brand-lockup + stats / faq intro + list)
   --------------------------------------------------------------------------- */
.about-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-14);
}
.faq-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-14);
}
.faq-grid__intro { flex: 1 1 360px; min-width: 0; }
.faq-grid__list { flex: 1.6 1 520px; min-width: 0; }
.faq-grid__intro .section-title { margin: var(--sp-5) 0 var(--sp-4); }
.faq-grid__intro .section-head__lead { flex: none; }

.section-head__aside {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  align-items: flex-end;
}
.section-head__aside .section-head__lead { flex: none; }

.section-head__leadwrap {
  flex: 0 1 520px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--sp-4);
}
.section-head__leadwrap .section-head__lead { flex: none; }
.section-head__pill {
  align-self: flex-end;
  border: var(--border-strong);
  border-radius: var(--r-pill);
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
}

/* ---------------------------------------------------------------------------
   10. RESPONSIVE (640 / 768 / 1024)
   --------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 var(--sp-6);
    flex-basis: 100%;
  }
  .stat-item:nth-child(n) { border: 0; padding: 0; margin-left: 0; }
}

@media (max-width: 900px) {
  .ai-column { padding: var(--sp-7) 0; }
  .ai-column + .ai-column { padding: var(--sp-7) 0; border-left: 0; }
  .solution-row { grid-template-columns: 96px minmax(0, 1fr); }
  .solution-row > .solution-number { grid-row: span 2; font-size: 80px; }
  .solution-row > .solution-row__solution { grid-column: 2; }
}

@media (max-width: 768px) {
  .voice { gap: var(--sp-8); }
}

@media (max-width: 640px) {
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-7) var(--sp-5); }
  .standard-item { border-left: 0; padding: var(--sp-5) 0; }
  .standard-item + .standard-item { border-top: var(--border-hairline); }
  .solution-row { grid-template-columns: minmax(0, 1fr); gap: var(--sp-6); }
  .solution-row > .solution-number { grid-row: auto; }
  .solution-row > .solution-row__solution { grid-column: auto; }
  .techtus-lockup { font-size: clamp(40px, 11vw, 56px); }
}