/* ═══════════════════════════════════════════════════════
   About Us Page Styles: Phượng Hoàng V2
   Extracted from about-us.html inline <style> block
   ═══════════════════════════════════════════════════════ */

/* ── Hero Split Layout ── */
/* First section: clears the fixed header (top bar is in flow, NOT double-counted) */
main > section:first-child.bp-section.ph-about-hero {
  padding-top: calc(var(--ph-header-h) + clamp(2rem, 3.5vw, 3rem));
}

.ph-about-hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.ph-about-hero-text {
  max-width: 580px;
}
.ph-about-hero-text .bp-section-title {
  text-align: left;
  margin-bottom: .75rem;
}
/* Open letter: tighter header gap so H1 flows into the letter subject */
.ph-about-hero-text .bp-section-header {
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
  text-align: left;
}
.ph-about-hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.ph-about-hero-visual img {
  width: 100%;
  height: auto;
  border-radius: var(--ph-radius-lg);
  object-fit: cover;
  aspect-ratio: 3/2;
}

/* ── About Page Cards ── */
.ph-about-card {
  padding: 2rem;
  background: var(--ph-surface-primary);
  border: 1px solid var(--ph-border-default);
  border-radius: var(--ph-radius-lg);
  transition: border-color .3s var(--ph-ease-out), transform .3s var(--ph-ease-out), box-shadow .3s var(--ph-ease-out);
}
.ph-about-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(11,25,41,.08);
  border-color: var(--ph-accent-subtle);
}
.ph-about-card:focus-visible {
  outline: 2px solid var(--ph-accent);
  outline-offset: 2px;
}
.ph-about-card:active {
  transform: scale(.985);
}
.ph-about-card-title {
  color: var(--ph-accent);
  font: var(--ph-text-h4);
  margin: 0 0 .75rem;
}
.ph-about-card-text {
  color: var(--ph-text-secondary);
  line-height: 1.75;
  font-size: .9375rem;
  margin: 0;
}

/* ── Values Grid ── */
.ph-value-icon-svg {
  width: 40px;
  height: 40px;
  color: var(--ph-accent);
  margin-bottom: .75rem;
  flex-shrink: 0;
}

/* ── Hero Visual ── */
/* (inherited by split hero) */

/* ── Open Letter Body ── */
.ph-about-letter-body p {
  color: var(--ph-text-secondary);
  font-size: .9375rem;
  line-height: 1.75;
  margin: 0 0 .85rem;
}
.ph-about-letter-body .ph-about-letter-salutation {
  margin-bottom: 1rem;
  color: var(--ph-text-primary);
  font-weight: 600;
}
.ph-about-letter-body .ph-about-letter-lead {
  color: var(--ph-text-primary);
  font-size: 1.0625rem;
  font-weight: 500;
}
/* Mission statement: prominent brand message closing the letter.
   Mirrors the site's eyebrow-tag convention (ph-section-tag):
   accent label on a subtle tint, display-font quote. */
.ph-about-letter-body .ph-about-letter-mission {
  margin-top: 1.1rem;
  padding: .9rem 1rem;
  border-left: 3px solid var(--ph-accent);
  background: var(--ph-accent-subtle);
  border-radius: var(--ph-radius-sm);
}
.ph-about-letter-body .ph-about-letter-mission-label {
  margin: 0 0 .3rem;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ph-accent);
}
.ph-about-letter-body .ph-about-letter-mission-quote {
  margin: 0;
  font-family: var(--ph-font-display);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ph-text-primary);
}
.ph-about-letter-sign {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ph-border-subtle);
}
.ph-about-letter-sign p {
  margin: 0;
  color: var(--ph-text-muted);
  font-size: .875rem;
  line-height: 1.6;
}
.ph-about-letter-sign .ph-about-letter-name {
  margin-top: .35rem;
  color: var(--ph-text-primary);
  font-weight: 600;
}

/* ── Certification Showcase ── */
.ph-about-cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}
.ph-about-cert-item {
  background: var(--ph-surface-primary);
  border: 1px solid var(--ph-border-default);
  border-radius: var(--ph-radius-md);
  padding: 1.25rem;
  text-align: center;
  transition: border-color .3s var(--ph-ease-out), transform .3s var(--ph-ease-out);
}
.ph-about-cert-item:hover {
  transform: translateY(-3px);
  border-color: var(--ph-accent);
  box-shadow: 0 8px 28px rgba(11,25,41,.08);
}
.ph-about-cert-item img {
  width: 100%;
  height: auto;
  max-height: 180px;
  object-fit: contain;
  margin-bottom: .75rem;
}
.ph-about-cert-item h3 {
  font: var(--ph-text-h5);
  color: var(--ph-text-primary);
  margin-bottom: .25rem;
  font-size: .875rem;
}
.ph-about-cert-item p {
  font-size: .75rem;
  color: var(--ph-text-secondary);
  line-height: 1.5;
}

/* ── Product Showcase Strip ── */
.ph-about-products-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}
.ph-about-prod-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--ph-surface-primary);
  border: 1px solid var(--ph-border-default);
  border-radius: var(--ph-radius-md);
  padding: 1.25rem;
  transition: border-color .3s var(--ph-ease-out), transform .3s var(--ph-ease-out);
  text-decoration: none;
}
.ph-about-prod-item:hover {
  transform: translateY(-3px);
  border-color: var(--ph-accent);
  box-shadow: 0 8px 28px rgba(11,25,41,.08);
}
.ph-about-prod-img {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  background: var(--ph-accent-subtle);
}
.ph-about-prod-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ph-about-prod-info h3 {
  font: var(--ph-text-h5);
  color: var(--ph-text-primary);
  margin-bottom: .25rem;
  font-size: .875rem;
}
.ph-about-prod-info p {
  font-size: .75rem;
  color: var(--ph-text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ── Why Choose Us: Editorial Numbered Rows ── */
.ph-about-why-list {
  /* container-wide handles external alignment; no inner max-width constraint */
}
.ph-about-why-row {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 2rem;
  align-items: start;
  padding: 2rem 0;
  border-bottom: 1px solid var(--ph-border-subtle);
}
.ph-about-why-row:first-child {
  border-top: 1px solid var(--ph-border-subtle);
}
.ph-about-why-num {
  font: var(--ph-text-mono-value);
  color: var(--ph-accent);
  opacity: .2;
  line-height: 1;
  text-align: center;
}
.ph-about-why-body h3 {
  font: var(--ph-text-h3);
  color: var(--ph-text-primary);
  margin: 0 0 .5rem;
}
.ph-about-why-body p {
  color: var(--ph-text-secondary);
  font-size: .9375rem;
  line-height: 1.7;
  margin: 0;
  max-width: 520px;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .ph-about-cert-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .ph-about-hero-split {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .ph-about-hero-text {
    max-width: 100%;
  }
  .ph-about-hero-visual {
    max-width: 400px;
    margin: 0 auto;
  }
  .ph-about-hero-visual img {
    aspect-ratio: 16/10;
  }
  .ph-about-products-strip {
    grid-template-columns: 1fr;
  }
  .ph-about-why-row {
    grid-template-columns: 48px 1fr;
    gap: 1.25rem;
    padding: 1.5rem 0;
  }
}
@media (max-width: 480px) {
  .ph-about-cert-grid { grid-template-columns: 1fr; }
  .ph-about-why-row {
    grid-template-columns: 1fr;
  }
  .ph-about-why-num {
    text-align: left;
    font-size: .875rem;
  }
}

@media (prefers-reduced-motion:reduce) {
  .ph-about-card,
  .ph-about-cert-item,
  .ph-about-prod-item { transition:none; }
  .ph-about-card:hover,
  .ph-about-card:active,
  .ph-about-cert-item:hover,
  .ph-about-prod-item:hover { transform:none; }
}