:root {
  --primary: #0A3A4A;
  --primary-dark: #072A36;
  --primary-light: #D6E9F0;
  --secondary: #F5A623;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --navbar-height: 70px;
  --shadow-sm: 0 1px 2px rgba(10, 58, 74, 0.06);
  --shadow-md: 0 4px 12px rgba(10, 58, 74, 0.08);
  --shadow-lg: 0 12px 28px rgba(10, 58, 74, 0.12);
  --radius: 1rem;
  --radius-lg: 1.25rem;
  --transition: 0.2s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.65;
  padding-top: var(--navbar-height);
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  background-color: var(--bg-primary);
  padding-bottom: 5rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ----- Hero ----- */
.about-hero {
  background: linear-gradient(165deg, var(--bg-secondary) 0%, var(--primary-light) 28%, var(--bg-secondary) 100%);
  border-bottom: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: 40%;
  max-width: 400px;
  height: 140%;
  background: radial-gradient(ellipse, rgba(245, 166, 35, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.about-hero-inner {
  padding: 3.5rem 0 3rem;
  position: relative;
  z-index: 1;
}

.about-hero-tag {
  display: inline-block;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  background-color: var(--primary-dark);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.about-hero-title {
  font-size: 2.25rem;
  line-height: 1.2;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 1.25rem;
  max-width: 20ch;
  letter-spacing: -0.02em;
}

.about-hero-subtitle {
  font-size: 1.08rem;
  color: var(--text-primary);
  max-width: 42rem;
  margin-bottom: 0.85rem;
  line-height: 1.7;
}

.about-hero-subtitle:last-of-type {
  margin-bottom: 0;
}

.about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-top: 2rem;
}

.about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.about-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.about-btn-primary {
  background-color: var(--primary-dark);
  color: #fff;
  border: 2px solid var(--primary-dark);
}

.about-btn-primary:hover {
  background-color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.about-btn-secondary {
  background-color: transparent;
  color: var(--primary-dark);
  border: 2px solid var(--primary-dark);
}

.about-btn-secondary:hover {
  background-color: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
}

/* ----- Apply journey (reduce anxiety, increase completion) ----- */
.about-apply-journey {
  background-color: var(--bg-secondary);
}

.about-steps {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.about-step {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.about-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.about-step-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 0.35rem;
}

.about-step-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin: 0;
}

/* ----- Key stat highlight (compensation) ----- */
.about-key-stat {
  font-weight: 600;
  color: var(--primary-dark);
}

/* ----- Section common ----- */
.about-section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.about-section:last-of-type {
  border-bottom: none;
}

.about-section-title {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 0.35rem;
  letter-spacing: -0.02em;
}

.about-section-title::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 3px;
  background: linear-gradient(90deg, var(--secondary), var(--primary));
  border-radius: 2px;
  margin-top: 0.5rem;
}

.about-section-tagline {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.03em;
  margin-bottom: 0.85rem;
  margin-top: 0.25rem;
}

.about-section-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 42rem;
  margin-bottom: 1rem;
  line-height: 1.7;
}

.about-section-lead:last-of-type {
  margin-bottom: 0;
}

/* ----- Vision & Mission ----- */
.about-vision-mission {
  background-color: var(--bg-primary);
}

.about-vm-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.75rem;
  margin-top: 1.25rem;
}

.about-vm-block {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

.about-vm-block::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--secondary), var(--primary));
  border-radius: 4px 0 0 4px;
}

.about-vm-block:hover {
  box-shadow: var(--shadow-md);
}

.about-vm-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--secondary);
  margin-bottom: 0.6rem;
}

.about-vm-text {
  font-size: 1.05rem;
  color: var(--primary-dark);
  font-weight: 600;
  line-height: 1.55;
}

.about-vm-block:first-child .about-vm-text {
  font-size: 1rem;
  letter-spacing: 0.01em;
}

/* ----- Philosophy: PLAY / LEARN / SUCCEED ----- */
.about-philosophy {
  background-color: var(--bg-tertiary);
}

.about-philosophy .about-section-title::after {
  background: linear-gradient(90deg, var(--secondary), var(--primary-light));
}

.about-philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.about-philosophy-card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.about-philosophy-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

.about-philosophy-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 0.85rem;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.about-philosophy-name::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--secondary);
}

.about-philosophy-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ----- Culture ----- */
.about-culture {
  background-color: var(--bg-primary);
}

.about-culture-list {
  list-style: none;
  margin: 1.25rem 0;
  padding: 0;
}

.about-culture-list li {
  font-size: 1.02rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.6;
}

.about-culture-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--secondary);
}

.about-culture-note {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 1.25rem;
  max-width: 42rem;
  line-height: 1.7;
}

/* ----- What We Value Most ----- */
.about-value-most {
  background-color: var(--bg-secondary);
}

.about-value-most .about-section-tagline {
  color: var(--primary-dark);
}

/* ----- Why Teachers Choose Us ----- */
.about-why-choose {
  background-color: var(--bg-primary);
}

.about-reasons-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: reason;
}

.about-reason-item {
  counter-increment: reason;
  margin-bottom: 2.25rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--border-color);
}

.about-reason-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.about-reason-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.about-reason-title::before {
  content: counter(reason) ")";
  flex-shrink: 0;
  color: var(--secondary);
  font-weight: 700;
}

.about-reason-lead {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.about-reason-item .about-list {
  list-style: none;
  padding-left: 0;
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.about-reason-item .about-list li {
  font-size: 0.98rem;
  color: var(--text-secondary);
  padding-left: 1.25rem;
  position: relative;
  line-height: 1.5;
}

.about-reason-item .about-list li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 600;
}

/* ----- What You'll Be Teaching ----- */
.about-teaching {
  background-color: var(--bg-tertiary);
}

/* ----- What Excellence Looks Like ----- */
.about-excellence {
  background-color: var(--bg-primary);
}

.about-excellence-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.about-excellence-list li {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
  padding-left: 2rem;
  position: relative;
  line-height: 1.55;
}

.about-excellence-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0.05em;
  width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
}

/* ----- Our Core Values ----- */
.about-core-values {
  background-color: var(--bg-secondary);
}

.about-core-values-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.about-core-values-list li {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  background-color: var(--bg-primary);
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--primary-dark);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition), color var(--transition);
}

.about-core-values-list li:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
  color: var(--primary);
}

/* ----- Join CTA ----- */
.about-join-cta {
  background: linear-gradient(165deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: #fff;
  text-align: center;
  padding: 4rem 1.5rem;
  border-bottom: none;
}

.about-join-cta .about-section-title {
  color: #fff;
}

.about-join-cta .about-section-title::after {
  background: rgba(255, 255, 255, 0.5);
  margin-left: auto;
  margin-right: auto;
}

.about-join-lead,
.about-join-cta .about-section-lead {
  color: rgba(255, 255, 255, 0.92);
  max-width: 32rem;
  margin-left: auto;
  margin-right: auto;
}

.about-join-tagline {
  font-size: 1.2rem;
  font-weight: 600;
  color: #fff;
  margin: 1.25rem 0 1.75rem;
  letter-spacing: 0.01em;
}

.about-cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
}

.about-cta-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  border-radius: 999px;
  background-color: #fff;
  color: var(--primary-dark);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition), transform var(--transition);
  box-shadow: var(--shadow-md);
}

.about-cta-primary:hover {
  background-color: var(--primary-light);
  color: var(--primary-dark);
  transform: translateY(-1px);
}

.about-cta-secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  border-radius: 999px;
  border: 2px solid rgba(255, 255, 255, 0.9);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.about-cta-secondary-btn:hover {
  background-color: #fff;
  color: var(--primary-dark);
  border-color: #fff;
  transform: translateY(-1px);
}

.about-cta-primary:focus-visible,
.about-cta-secondary-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* ----- Sticky CTA bar ----- */
.about-sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-color);
  box-shadow: 0 -4px 20px rgba(10, 58, 74, 0.08);
  padding: 0.75rem 0;
  transform: translateY(100%);
  transition: transform 0.25s ease;
}

.about-sticky-cta.is-visible {
  transform: translateY(0);
}

.about-sticky-cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem 1.25rem;
}

.about-sticky-cta-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-right: 0.25rem;
}

.about-sticky-cta-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  transition: background-color var(--transition), color var(--transition);
}

.about-sticky-cta-link:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.about-sticky-cta-link:hover {
  background-color: var(--bg-secondary);
  color: var(--primary-dark);
}

.about-sticky-cta-link-primary {
  background-color: var(--primary-dark);
  color: #fff;
  padding: 0.5rem 1.25rem;
}

.about-sticky-cta-link-primary:hover {
  background-color: var(--primary);
  color: #fff;
}

/* ----- Responsive ----- */
@media (max-width: 992px) {
  .about-philosophy-grid {
    grid-template-columns: 1fr;
  }

  .about-vm-grid {
    grid-template-columns: 1fr;
  }

  .about-steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  body {
    padding-top: 72px;
  }

  .container {
    padding: 0 1.25rem;
  }

  .about-hero-inner {
    padding: 2.5rem 0 2.5rem;
  }

  .about-hero-title {
    font-size: 1.75rem;
    max-width: none;
  }

  .about-hero-subtitle {
    font-size: 1rem;
  }

  .about-section {
    padding: 2.5rem 0;
  }

  .about-section-title {
    font-size: 1.4rem;
  }

  .about-section-tagline {
    font-size: 1.05rem;
  }

  .about-vm-block {
    padding: 1.5rem 1.25rem;
  }

  .about-philosophy-card {
    padding: 1.5rem 1.25rem;
  }

  .about-cta-buttons {
    flex-direction: column;
  }

  .about-cta-primary,
  .about-cta-secondary-btn {
    width: 100%;
    max-width: 280px;
  }

  .about-join-cta {
    padding: 3rem 1.25rem;
  }

  .about-hero-cta {
    flex-direction: column;
    align-items: stretch;
    margin-top: 1.5rem;
  }

  .about-btn {
    width: 100%;
  }

  .about-sticky-cta-inner {
    flex-direction: column;
  }

  .about-sticky-cta-text {
    margin-right: 0;
  }
}