/* ==========================================================================
   Scrivo About Page Stylesheet
   Follows Scrivo Design Specification (Design.md)
   Inter typography, high-contrast, sub-10ms UI execution, full Dark/Light support
   ========================================================================== */

:root {
  --spec-green: #10b981;
  --spec-green-glow: rgba(16, 185, 129, 0.4);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.about-hero {
  width: 100%;
  padding-top: 64px;
  padding-bottom: 72px;
}

.hero-text-block {
  max-width: 780px;
  text-align: left;
}

.hero-tag {
  font-size: 14px;
  font-weight: 450;
  color: var(--text-tag);
  margin-bottom: 12px;
  display: block;
  letter-spacing: -0.01em;
  transition: color 0.25s ease;
}

h1.hero-title {
  font-size: 46px;
  line-height: 1.15;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin: 0 0 14px 0;
  text-wrap: balance;
  transition: color 0.25s ease;
}

p.hero-subtitle {
  font-size: 19px;
  line-height: 1.55;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  margin-top: 0;
  margin-bottom: 34px;
  max-width: 680px;
  transition: color 0.25s ease;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.hero-cta-btn {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  padding: 12px 22px;
  font-size: 14.5px;
  font-weight: 500;
  border-radius: 9999px;
  border: 1px solid transparent;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background-color 0.18s ease, transform 0.1s ease;
}

.hero-cta-btn:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-1px);
}

.hero-secondary-btn {
  background: transparent;
  color: var(--btn-secondary-text);
  border: 1px solid var(--btn-secondary-border);
  padding: 12px 22px;
  font-size: 14.5px;
  font-weight: 450;
  border-radius: 9999px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.18s ease;
}

.hero-secondary-btn:hover {
  background: var(--btn-secondary-hover-bg);
  border-color: var(--btn-secondary-hover-border);
}

/* Hero Telemetry Card Strip */
.hero-telemetry-card {
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.telemetry-col {
  border-right: 1px solid var(--card-inner-border);
  padding-right: 16px;
}

.telemetry-col:last-child {
  border-right: none;
  padding-right: 0;
}

.telemetry-tag {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.telemetry-value {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.15;
}

.telemetry-desc {
  font-size: 12.5px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ==========================================================================
   Content & Editorial Sections
   ========================================================================== */
.content-section {
  padding: 88px 0;
  border-top: 1px solid var(--header-border);
  background: var(--bg-body);
  transition: background-color 0.25s ease;
}

.section-header {
  max-width: 820px;
  margin-bottom: 40px;
}

.section-tag {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 36px;
  line-height: 1.2;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin-bottom: 10px;
  text-wrap: balance;
}

.section-subtitle {
  font-size: 18px;
  line-height: 1.55;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  max-width: 680px;
}

/* Two-Column Comparison Cards */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.editorial-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 32px 28px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
  transition: background-color 0.25s ease, border-color 0.25s ease, transform 0.2s ease;
}

.editorial-card:hover {
  transform: translateY(-2px);
}

.editorial-card-badge {
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: inline-block;
  margin-bottom: 12px;
}

.badge-problem {
  color: var(--accent-orange);
}

.badge-solution {
  color: var(--spec-green);
}

.editorial-card h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.editorial-card p {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.editorial-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.editorial-card li {
  font-size: 13.5px;
  color: var(--text-primary);
  padding: 8px 0;
  border-top: 1px solid var(--card-inner-border);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.45;
}

.editorial-card li span.bullet {
  color: var(--text-muted);
  font-weight: 700;
  font-size: 12px;
  margin-top: 1px;
}

/* 3-Column Pillar System Cards */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 28px;
}

.pillar-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
  transition: background-color 0.25s ease, border-color 0.25s ease, transform 0.2s ease;
}

.pillar-card:hover {
  transform: translateY(-2px);
}

.pillar-card-num {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.pillar-card h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.pillar-card p {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: 16px;
  flex-grow: 1;
}

.pillar-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.pillar-pill {
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-tag);
  background: var(--card-inner-bg);
  border: 1px solid var(--card-inner-border);
  padding: 3px 9px;
  border-radius: 9999px;
}

/* ==========================================================================
   Security Box (Zero-Knowledge & DPDP)
   ========================================================================== */
.security-box {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 56px 44px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 56px;
  align-items: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.security-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 20px;
  padding: 6px 14px;
  background: var(--card-inner-bg);
  border: 1px solid var(--card-inner-border);
  border-radius: 9999px;
}

.security-eyebrow svg {
  width: 13px;
  height: 13px;
  stroke: currentColor;
  stroke-width: 2.4;
  fill: none;
}

.security-box h3 {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.security-box p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.security-specs-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-left: 1px solid var(--card-inner-border);
  padding-left: 36px;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--card-inner-bg);
  border: 1px solid var(--card-inner-border);
  border-radius: 9999px;
  font-size: 13px;
  font-weight: 450;
  color: var(--text-secondary);
}

.spec-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--spec-green);
  box-shadow: 0 0 6px var(--spec-green-glow);
  flex-shrink: 0;
}

/* ==========================================================================
   FAQ Section (Two-Column Desktop + Smooth CSS Grid Accordion)
   ========================================================================== */
.about-faq-section {
  padding-top: 110px;
  padding-bottom: 130px;
  border-top: 1px solid var(--header-border);
  background: var(--bg-body);
  transition: background-color 0.25s ease;
}

.faq-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 72px;
  align-items: flex-start;
}

.faq-sticky-sidebar {
  position: sticky;
  top: 96px;
}

.faq-tag {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: block;
}

.faq-title {
  font-size: 34px;
  line-height: 1.2;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin-bottom: 14px;
  text-wrap: balance;
}

.faq-subtitle {
  font-size: 16px;
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.faq-contact-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 20px;
}

.faq-contact-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 14px;
}

.faq-contact-btn {
  width: 100%;
  font-size: 13.5px;
  font-weight: 500;
}

/* Accordion Item & Grid Expansion Animation */
.faq-list {
  display: flex;
  flex-direction: column;
}

.faq-item {
  border-bottom: 1px solid var(--card-border);
}

.faq-item:first-child {
  border-top: 1px solid var(--card-border);
}

.faq-trigger {
  width: 100%;
  background: transparent;
  border: none;
  padding: 22px 0;
  font-size: 17px;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.015em;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.18s ease;
}

.faq-trigger:hover {
  opacity: 0.85;
}

.faq-trigger-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-left: 16px;
  transition: transform 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              background-color 0.2s ease,
              color 0.2s ease,
              border-color 0.2s ease;
}

.faq-trigger-icon svg {
  width: 12px;
  height: 12px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.faq-item.is-open .faq-trigger-icon {
  transform: rotate(45deg);
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-color: transparent;
}

.faq-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-item.is-open .faq-body {
  grid-template-rows: 1fr;
}

.faq-body-inner {
  overflow: hidden;
}

.faq-content {
  padding-bottom: 22px;
  font-size: 15px;
  line-height: 1.62;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  font-weight: 400;
  text-wrap: pretty;
}

.faq-content strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* ==========================================================================
   Final CTA Banner
   ========================================================================== */
.final-cta-section {
  padding: 80px 0 100px;
  background: var(--bg-body);
}

.final-cta-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 64px 40px;
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.cta-tag {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tag);
  margin-bottom: 14px;
  display: block;
}

.cta-title {
  font-size: 38px;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 16px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  text-wrap: balance;
}

.cta-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 32px auto;
  line-height: 1.55;
}

.cta-btn-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.cta-btn-main {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 9999px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, transform 0.2s ease;
}

.cta-btn-main:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-1px);
}

.cta-btn-sub {
  border: 1px solid var(--btn-secondary-border);
  background: transparent;
  color: var(--btn-secondary-text);
  padding: 12px 26px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 9999px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: all 0.2s ease;
}

.cta-btn-sub:hover {
  background: var(--btn-secondary-hover-bg);
  border-color: var(--btn-secondary-hover-border);
}

.cta-guarantee-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.cta-guarantee-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.cta-guarantee-item svg {
  width: 14px;
  height: 14px;
  stroke: var(--spec-green);
  stroke-width: 2.2;
  fill: none;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  .about-hero {
    padding-top: 52px;
    padding-bottom: 60px;
  }
  h1.hero-title {
    font-size: clamp(34px, 4.5vw, 40px);
  }
  p.hero-subtitle {
    font-size: 17.5px;
    line-height: 1.5;
    margin-bottom: 28px;
  }
  .hero-cta-group {
    margin-bottom: 44px;
  }

  .hero-telemetry-card {
    grid-template-columns: repeat(2, 1fr);
  }
  .telemetry-col:nth-child(2) {
    border-right: none;
  }
  .telemetry-col:nth-child(-n+2) {
    border-bottom: 1px solid var(--card-inner-border);
    padding-bottom: 16px;
  }

  .comparison-grid,
  .pillar-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .security-box {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 32px;
  }
  .security-specs-container {
    border-left: none;
    border-top: 1px solid var(--card-inner-border);
    padding-left: 0;
    padding-top: 24px;
  }

  .about-faq-section {
    padding-top: 60px;
    padding-bottom: 68px;
  }
  .faq-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .faq-sticky-sidebar {
    position: static;
  }
  .faq-title {
    font-size: 30px;
  }

  .final-cta-card {
    padding: 48px 28px;
  }
  .cta-title {
    font-size: 32px;
  }
}

@media (max-width: 768px) {
  .about-hero {
    padding-top: 44px;
    padding-bottom: 52px;
  }
  h1.hero-title {
    font-size: clamp(30px, 5.5vw, 36px);
  }
  p.hero-subtitle {
    font-size: 16.5px;
  }

  .faq-trigger {
    font-size: 16px;
    padding: 16px 0;
  }
  .faq-content {
    font-size: 14px;
  }

  .final-cta-card {
    padding: 40px 22px;
    border-radius: 18px;
  }
  .cta-title {
    font-size: 28px;
  }
  .cta-subtitle {
    font-size: 15.5px;
  }
}

@media (max-width: 640px) {
  .about-hero {
    padding-top: 28px;
    padding-bottom: 32px;
  }
  .hero-tag {
    font-size: 13px;
    margin-bottom: 10px;
  }
  h1.hero-title {
    font-size: clamp(26px, 7.5vw, 32px);
    line-height: 1.2;
    margin-bottom: 12px;
  }
  p.hero-subtitle {
    font-size: 15.5px;
    margin-bottom: 24px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-bottom: 32px;
  }
  .hero-cta-btn,
  .hero-secondary-btn {
    width: 100%;
    justify-content: center;
    padding: 13px 20px;
    font-size: 14.5px;
  }

  .hero-telemetry-card {
    grid-template-columns: 1fr;
  }
  .telemetry-col {
    border-right: none;
    border-bottom: 1px solid var(--card-inner-border);
    padding-bottom: 14px;
  }
  .telemetry-col:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .content-section {
    padding: 56px 0;
  }
  .section-title {
    font-size: 28px;
  }
  .editorial-card {
    padding: 24px 20px;
  }
  .pillar-card {
    padding: 22px 18px;
  }

  .security-box {
    padding: 32px 20px;
  }
  .security-box h3 {
    font-size: 25px;
  }

  .final-cta-card {
    padding: 32px 18px;
    border-radius: 16px;
  }
  .cta-title {
    font-size: clamp(28px, 7.5vw, 32px);
    line-height: 1.25;
  }
  .cta-subtitle {
    font-size: 14.5px;
    margin-bottom: 22px;
  }
  .cta-btn-group {
    flex-direction: column;
    align-items: stretch;
  }
  .cta-btn-main,
  .cta-btn-sub {
    width: 100%;
    justify-content: center;
  }
  .cta-guarantee-group {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }
}