/* ============================================
   PETRO ON THE GO — Official Design System
   Tokens sourced from: Petro Design Concept v2
   ============================================ */

/* 1. Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  color: var(--text-primary);
  background: var(--bg-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; }

/* 2. Official Design Tokens */
:root {
  /* Brand core */
  --petro-blue:       #0072BC;
  --petro-gold:       #FCC92C;
  --petro-ink:        #1B1B1B;

  /* Blue ramp */
  --blue-300:         #7AC6F4;
  --blue-400:         #4FB0EC;
  --blue-500:         #2E9BE0;  /* interactive text / links */
  --blue-600:         #1A86CF;
  --blue-700:         #0072BC;  /* primary button fill */

  /* Gold ramp */
  --gold-400:         #FFD659;
  --gold-500:         #FCC92C;  /* brand accent */
  --gold-600:         #E0AC12;

  /* Surfaces */
  --bg-base:          #0A0E14;
  --surface:          #121821;
  --elevated:         #1A222E;
  --glass-fill:       rgba(255, 255, 255, 0.06);
  --glass-blue:       rgba(0, 114, 188, 0.14);
  --hairline:         rgba(255, 255, 255, 0.10);

  /* Text */
  --text-primary:     #F4F7FB;
  --text-secondary:   #AEB9C7;
  --text-tertiary:    #6E7A89;
  --text-disabled:    #4A5462;

  /* Semantic */
  --success:          #34D399;
  --warning:          #FBBF24;
  --error:            #F87171;
  --info:             #4FB0EC;

  /* Layout */
  --font-family:      'Inter', sans-serif;
  --font-size-hero:   clamp(2.8rem, 7vw, 5.5rem);
  --font-size-h2:     clamp(1.8rem, 4vw, 3rem);
  --border-radius:    12px;
  --transition:       0.2s ease;
  --max-width:        1100px;
}

/* 3. Shared utilities */
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--petro-gold);
  margin-bottom: 0.9rem;
}

h2 {
  font-size: var(--font-size-h2);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 3rem;
}

/* 4. CTA Button */
.cta-btn {
  display: inline-block;
  background: var(--petro-blue);
  color: #fff;
  padding: 0.8rem 1.75rem;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  transition: opacity var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}
.cta-btn:hover { opacity: 0.88; transform: translateY(-1px); }

.cta-btn--hero {
  background: var(--petro-gold);
  color: var(--petro-ink);
  padding: 1rem 2.5rem;
  font-size: 1rem;
  font-weight: 700;
}
.cta-btn--hero:hover { background: var(--gold-400); }

.cta-btn--dark {
  background: var(--petro-ink);
  color: #fff;
}

/* 5. NAV */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 2.5rem;
  background: var(--bg-base);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#nav.scrolled {
  border-bottom-color: var(--hairline);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.4);
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo-petro {
  font-size: 1.2rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
}

.logo-sub {
  font-size: 0.52rem;
  font-weight: 600;
  color: var(--text-tertiary);
  letter-spacing: 0.18em;
  margin-top: 2px;
}

/* 6. HERO */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--bg-base);
  padding: 8rem 2rem 5rem;
  position: relative;
  overflow: hidden;
}

/* Subtle radial glow behind hero content */
#hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(0, 114, 188, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  max-width: 780px;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--petro-gold);
  margin-bottom: 1.4rem;
}

#hero h1 {
  font-size: var(--font-size-hero);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.03;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 2.5rem;
  font-weight: 400;
  line-height: 1.7;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-disabled);
  animation: bounce 2s infinite;
  z-index: 1;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.4; }
  50%       { transform: translateX(-50%) translateY(6px); opacity: 0.8; }
}

/* 7. HOW IT WORKS */
#how-it-works {
  background: var(--surface);
  padding: 7rem 2rem;
  border-top: 1px solid var(--hairline);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.step-card {
  background: var(--elevated);
  border: 1px solid var(--hairline);
  border-radius: var(--border-radius);
  padding: 2.5rem 2rem;
  transition: transform var(--transition), border-color var(--transition);
}

.step-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 114, 188, 0.4);
}

.step-icon {
  width: 2.25rem;
  height: 2.25rem;
  color: var(--blue-400);
  margin-bottom: 1rem;
}

.step-icon svg { width: 100%; height: 100%; }

.step-num {
  display: block;
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--petro-gold);
  line-height: 1;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
}

.step-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.step-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* 8. WHY PETRO */
#why-petro {
  background: var(--bg-base);
  padding: 7rem 2rem;
  border-top: 1px solid var(--hairline);
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.pillar-card {
  background: var(--glass-blue);
  border: 1px solid rgba(0, 114, 188, 0.25);
  border-radius: var(--border-radius);
  padding: 2.5rem 2rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: transform var(--transition), border-color var(--transition);
}

.pillar-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 114, 188, 0.5);
}

.pillar-icon {
  width: 2.25rem;
  height: 2.25rem;
  color: var(--petro-gold);
  margin-bottom: 1.25rem;
}

.pillar-icon svg { width: 100%; height: 100%; }

.pillar-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
}

.pillar-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* 9. TESTIMONIALS */
#testimonials {
  background: var(--surface);
  padding: 7rem 2rem;
  text-align: center;
  border-top: 1px solid var(--hairline);
}

.review-card {
  max-width: 680px;
  margin: 0 auto 2rem;
  background: var(--elevated);
  border: 1px solid var(--hairline);
  border-radius: var(--border-radius);
  padding: 3rem 2.5rem;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.review-stars {
  font-size: 1.2rem;
  color: var(--petro-gold);
  margin-bottom: 1.25rem;
  letter-spacing: 0.05em;
}

.review-quote {
  font-size: 1.1rem;
  font-weight: 500;
  font-style: italic;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.review-meta { margin-top: auto; }

.review-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.review-location {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  margin-top: 0.2rem;
}

.review-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.5rem;
}

.review-controls button {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  background: var(--elevated);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.review-controls button:hover {
  background: var(--petro-blue);
  color: #fff;
  border-color: var(--petro-blue);
}

.review-dots {
  display: flex;
  gap: 0.4rem;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-disabled);
  transition: background var(--transition), transform var(--transition);
  cursor: pointer;
}

.dot.active {
  background: var(--petro-blue);
  transform: scale(1.3);
}

/* 10. CTA BANNER */
#cta-banner {
  background: var(--petro-gold);
  padding: 6rem 2rem;
  text-align: center;
}

#cta-banner h2 {
  font-size: var(--font-size-h2);
  font-weight: 900;
  color: var(--petro-ink);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

#cta-banner p {
  font-size: 1.05rem;
  color: var(--petro-ink);
  opacity: 0.7;
  margin-bottom: 2.25rem;
  font-weight: 500;
}

/* 11. FOOTER */
#footer {
  background: var(--bg-base);
  border-top: 1px solid var(--hairline);
  padding: 2.25rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-slogan {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
}

.footer-nav a {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  transition: color var(--transition);
}

.footer-nav a:hover { color: var(--text-primary); }

/* 12. RESPONSIVE */
@media (max-width: 768px) {
  #nav { padding: 1rem 1.25rem; }

  #hero { padding: 7rem 1.5rem 4rem; }

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

  #how-it-works,
  #why-petro,
  #testimonials { padding: 5rem 1.25rem; }

  #cta-banner { padding: 4.5rem 1.25rem; }

  .review-card { padding: 2rem 1.5rem; }

  #footer {
    flex-direction: column;
    text-align: center;
    padding: 2rem 1.25rem;
  }

  .footer-nav { justify-content: center; }
}

@media (max-width: 480px) {
  #hero h1 { letter-spacing: -0.02em; }
  .hero-sub { font-size: 1rem; }
  .review-quote { font-size: 1rem; }
}