/* ============================================================================
   EMAdvertise Frontend — Intro Page Styles
   Scrollable content with fixed bottom CTA. Logo, welcome text, explanation
   sections, and language selector scroll; Get Started button is always visible.
   ============================================================================ */

.intro-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: radial-gradient(
    ellipse 60% 50% at 50% 40%,
    rgba(79, 195, 247, 0.08) 0%,
    transparent 100%
  ), var(--color-bg-primary);
}

/* Scrollable content area (everything except the fixed bottom CTA) */
.intro-scroll {
  flex: 1;
  width: 100%;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-6);
  padding-top: calc(var(--space-12) + var(--safe-area-top));
  padding-bottom: calc(100px + var(--safe-area-bottom));
}

/* Logo area */
.intro-logo {
  margin-bottom: var(--space-8);
  animation: fadeInUp 300ms ease forwards;
}

.intro-logo svg,
.intro-logo img {
  width: 100px;
  height: 100px;
  margin: 0 auto;
  filter: drop-shadow(0 4px 16px rgba(79, 195, 247, 0.4));
}

@media (min-width: 768px) {
  .intro-logo svg,
  .intro-logo img {
    width: 120px;
    height: 120px;
  }
}

/* Welcome text */
.intro-content {
  max-width: 400px;
  animation: fadeInUp 300ms ease 100ms forwards;
  opacity: 0;
}

.intro-content h1 {
  margin-bottom: var(--space-3);
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.intro-content p {
  margin-bottom: var(--space-8);
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
}

/* Language selector (centered, pill style) */
.intro-lang {
  margin-bottom: var(--space-6);
  animation: fadeInUp 300ms ease 200ms forwards;
  opacity: 0;
}

/* Fixed bottom CTA — always visible */
.intro-start {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: var(--space-4) var(--space-6);
  padding-bottom: calc(var(--space-4) + var(--safe-area-bottom));
  background: linear-gradient(to top, var(--color-bg-primary) 60%, transparent 100%);
  animation: fadeInUp 300ms ease 300ms forwards;
  opacity: 0;
}

.intro-start .btn {
  padding: var(--space-4) var(--space-10);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-glow);
  transition: all var(--transition-fast);
  width: 100%;
  max-width: 340px;
}

.intro-start .btn:hover {
  box-shadow: 0 0 40px rgba(79, 195, 247, 0.5);
  transform: scale(1.02);
}

.intro-start .btn:active {
  transform: scale(0.97);
}

/* Footer note */
.intro-footer {
  position: absolute;
  bottom: calc(var(--space-6) + var(--safe-area-bottom));
  text-align: center;
  opacity: 0;
  animation: fadeIn 300ms ease 400ms forwards;
}

/* Landscape phone optimization */
@media (orientation: landscape) and (max-height: 500px) {
  .intro-scroll {
    padding-top: var(--space-4);
    padding-bottom: calc(80px + var(--safe-area-bottom));
  }

  .intro-logo {
    margin-bottom: var(--space-4);
  }

  .intro-logo svg,
  .intro-logo img {
    width: 60px;
    height: 60px;
  }

  .intro-content {
    max-width: 480px;
  }

  .intro-content h1 {
    font-size: clamp(1.25rem, 1rem + 1vw, 1.75rem);
    margin-bottom: var(--space-2);
  }

  .intro-content p {
    margin-bottom: var(--space-4);
    font-size: var(--font-size-sm);
  }

  .intro-start {
    padding: var(--space-2) var(--space-4);
    padding-bottom: calc(var(--space-2) + var(--safe-area-bottom));
  }

  .intro-start .btn {
    padding: var(--space-2) var(--space-6);
    font-size: var(--font-size-base);
  }
}

/* ============================================================================
   "What is EMAdvertise?" section
   ============================================================================ */

.intro-what {
  max-width: 520px;
  margin: 0 auto var(--space-6);
  animation: fadeInUp 300ms ease 150ms forwards;
  opacity: 0;
}

.intro-what h2 {
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.intro-what p {
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

/* ============================================================================
   "How It Works" steps grid
   ============================================================================ */

.intro-how {
  max-width: 600px;
  margin: 0 auto var(--space-8);
  animation: fadeInUp 300ms ease 200ms forwards;
  opacity: 0;
}

.intro-how h2 {
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.steps-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 480px) {
  .steps-grid {
    grid-template-columns: 1fr;
  }
}

.step-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: var(--space-4);
  text-align: center;
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
  cursor: default;
}

.step-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.step-icon {
  font-size: 2rem;
  margin-bottom: var(--space-2);
  display: block;
}

.step-card h3 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
  color: var(--color-text-primary);
}

.step-card p {
  font-size: var(--font-size-xs);
  line-height: var(--line-height-normal);
  color: var(--color-text-muted);
  margin: 0;
}