/**
 * Aira Antivirus — Stage 6: Get Started / Download Onboarding & Conversion
 * Visual Direction: Premium Cybersecurity × AI Infrastructure
 * Strictly adhering to:
 * - frontend-design (distinctive visual identity, restrained purposeful motion)
 * - frontend-ui-engineering (fluid scales, 44px touch targets, responsive stacking)
 * - better-colors (semantic token hierarchy, WCAG AA contrast)
 * - better-accessibility (visible focus rings, prefers-reduced-motion)
 */

/* ==========================================================================
   1. Section Structure & Ambient Lighting
   ========================================================================== */

.onboarding-section {
  position: relative;
  padding-block: clamp(3.5rem, 7vw, 6.5rem);
  background-color: var(--surface-canvas);
  border-top: 1px solid var(--border-subtle);
  overflow: hidden;
}

.onboarding__glow {
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translateX(-50%);
  width: min(800px, 90vw);
  height: 400px;
  background: radial-gradient(
    ellipse at center,
    rgba(59, 102, 255, 0.07) 0%,
    rgba(6, 182, 212, 0.03) 40%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

.onboarding__container {
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   2. Section Header
   ========================================================================== */

.onboarding__header {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
}

.onboarding__header .section-label {
  margin-bottom: var(--space-2);
}

.onboarding__title {
  font-family: var(--font-sans);
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  text-wrap: balance;
}

.onboarding__subtitle {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  max-width: 52ch;
  margin-inline: auto;
  text-wrap: balance;
}

/* ==========================================================================
   3. Three-Step Connected Flow
   Desktop: Connected horizontal flow with traveling data pulse
   Mobile: Dedicated timeline column to the left, nodes vertically connected
   ========================================================================== */

.onboarding-flow {
  position: relative;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

/* --- Desktop Horizontal Route Track & Animated Pulse (>= 1024px) --- */
.onboarding-route {
  display: none;
}

@media (min-width: 1024px) {
  .onboarding-route {
    display: block;
    position: absolute;
    top: 24px;
    left: calc(16.666% - 10px);
    right: calc(16.666% - 10px);
    height: 2px;
    pointer-events: none;
    z-index: 1;
  }

  .onboarding-route__track {
    width: 100%;
    height: 100%;
    background: linear-gradient(
      90deg,
      rgba(59, 102, 255, 0.15) 0%,
      rgba(6, 182, 212, 0.45) 50%,
      rgba(59, 102, 255, 0.15) 100%
    );
    border-radius: 1px;
    box-shadow: 0 0 8px rgba(6, 182, 212, 0.2);
  }

  .onboarding-route__pulse {
    position: absolute;
    top: -4px;
    left: 0;
    width: 150px;
    height: 10px;
    border-radius: 5px;
    background: radial-gradient(
      ellipse 65% 50% at center,
      rgba(56, 189, 248, 0.45) 0%,
      rgba(59, 102, 255, 0.22) 50%,
      transparent 80%
    );
    filter: blur(4px);
    box-shadow: 0 0 14px rgba(56, 189, 248, 0.25);
    animation: route-data-flow 3.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  }
}

@keyframes route-data-flow {
  0% {
    left: 0%;
    opacity: 0;
    transform: scaleX(0.7);
  }
  15% {
    opacity: 0.85;
    transform: scaleX(1);
  }
  85% {
    opacity: 0.85;
    transform: scaleX(1);
  }
  100% {
    left: calc(100% - 150px);
    opacity: 0;
    transform: scaleX(0.7);
  }
}

/* --- Steps List Container --- */
.onboarding-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-4); /* compact gap on mobile */
  position: relative;
  z-index: 2;
}

/* --- Mobile / Tablet Step Structure (< 1024px) --- */
/* Dedicated 44px timeline column on the left; cards completely on the right */
.onboarding-step {
  display: grid;
  grid-template-columns: 44px 1fr;
  column-gap: var(--space-4);
  align-items: start;
  position: relative;
}

/* Node circle in left column */
.onboarding-step__node {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0;
  padding-top: var(--space-2); /* aligned with upper area of card */
  position: relative;
  z-index: 3;
}

.onboarding-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background-color: var(--surface-card);
  border: 2px solid var(--border-default);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wider);
  color: var(--text-accent-bright);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.onboarding-step:hover .onboarding-step__num,
.onboarding-step:focus-within .onboarding-step__num {
  border-color: var(--color-accent-400);
  background-color: var(--surface-interactive);
  box-shadow: 0 0 14px rgba(59, 102, 255, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

.onboarding-step.is-step-active .onboarding-step__num {
  border-color: var(--color-accent-500);
  box-shadow: 0 0 14px rgba(59, 102, 255, 0.35);
}

/* Vertical line strictly connecting nodes in the 44px column — does NOT intersect cards */
.onboarding-step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: calc(var(--space-2) + 42px); /* starts directly beneath node circle */
  left: 21px; /* perfectly centered in 44px column */
  width: 2px;
  bottom: calc(-1 * var(--space-4)); /* connects to top of next step */
  background: linear-gradient(
    180deg,
    rgba(59, 102, 255, 0.4) 0%,
    rgba(6, 182, 212, 0.6) 50%,
    rgba(59, 102, 255, 0.4) 100%
  );
  box-shadow: 0 0 6px rgba(6, 182, 212, 0.25);
  z-index: 1;
}

/* Mobile vertical animated route pulse */
.onboarding-step:not(:last-child)::before {
  content: '';
  position: absolute;
  top: calc(var(--space-2) + 42px);
  left: 19px;
  width: 6px;
  height: 22px;
  border-radius: 3px;
  background: radial-gradient(
    ellipse at center,
    var(--color-cyan-400) 0%,
    rgba(59, 102, 255, 0.8) 60%,
    transparent 100%
  );
  filter: blur(1px);
  box-shadow: 0 0 8px var(--color-cyan-400);
  z-index: 2;
  animation: mobile-route-pulse 2.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  pointer-events: none;
}

.onboarding-step:nth-child(2)::before {
  animation-delay: 1.4s;
}

@keyframes mobile-route-pulse {
  0% {
    top: calc(var(--space-2) + 42px);
    opacity: 0;
    transform: scaleY(0.6);
  }
  20% {
    opacity: 1;
    transform: scaleY(1);
  }
  80% {
    opacity: 1;
    transform: scaleY(1);
  }
  100% {
    top: calc(100% + var(--space-4));
    opacity: 0;
    transform: scaleY(0.6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .onboarding-route__pulse,
  .onboarding-step::before {
    animation: none !important;
    display: none !important;
  }
}

/* --- Desktop Layout Overrides (>= 1024px) --- */
@media (min-width: 1024px) {
  .onboarding-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }

  .onboarding-step {
    display: flex;
    flex-direction: column;
    grid-template-columns: none;
    column-gap: 0;
    align-items: stretch;
  }

  .onboarding-step__node {
    margin-bottom: var(--space-4);
    padding-top: 0;
    justify-content: center;
  }

  .onboarding-step__num {
    width: 48px;
    height: 48px;
    font-size: var(--text-sm);
  }

  .onboarding-step::before,
  .onboarding-step::after {
    display: none !important;
  }
}

/* ==========================================================================
   4. Step Card Styling (Consistent Blue/Cyan Design System)
   ========================================================================== */

.onboarding-step__card {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: clamp(1.25rem, 2.5vw, 1.5rem); /* compact, proportional padding */
  border-radius: var(--radius-lg);
  background-color: var(--surface-card);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.onboarding-step__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(59, 102, 255, 0.35) 50%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.onboarding-step:hover .onboarding-step__card,
.onboarding-step:focus-within .onboarding-step__card {
  border-color: var(--border-strong);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 12px rgba(59, 102, 255, 0.1);
}

.onboarding-step:hover .onboarding-step__card::before,
.onboarding-step:focus-within .onboarding-step__card::before {
  opacity: 1;
}

/* Card Header */
.onboarding-step__card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

/* Card Title */
.onboarding-step__title {
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-2);
}

/* Card Description */
.onboarding-step__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
  flex-grow: 1;
}

/* Card Footer / Tag */
.onboarding-step__footer {
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-subtle);
}

.onboarding-step__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  letter-spacing: var(--tracking-wide);
}

.onboarding-step__tag-icon {
  width: 14px;
  height: 14px;
  color: var(--color-cyan-400);
  flex-shrink: 0;
}

@media (min-width: 1024px) {
  .onboarding-step:nth-child(2) .onboarding-step__tag {
    white-space: nowrap;
    font-size: clamp(0.68rem, 0.78vw, 0.75rem);
    letter-spacing: 0.02em;
  }
}

/* Step 3 subtle green readiness dot */
.onboarding-step__tag--secure .badge__dot {
  background-color: var(--status-secure);
  width: 6px;
  height: 6px;
}

#download,
.onboarding-cta {
  scroll-margin-top: calc(72px + 24px);
}

@media (max-width: 768px) {
  #download,
  .onboarding-cta {
    scroll-margin-top: calc(64px + 16px);
  }
}

.onboarding-cta {
  position: relative;
  max-width: 760px;
  margin-inline: auto;
  border-radius: var(--radius-xl);
  border: 1px solid transparent;
  /* Dual-box background: dark layered radial gradients clipped to padding-box,
     and a subtle cyber blue/cyan/silver gradient clipped to border-box */
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(30, 64, 175, 0.16) 0%, rgba(6, 182, 212, 0.04) 40%, transparent 75%) padding-box,
    linear-gradient(180deg, rgba(20, 27, 38, 0.96) 0%, rgba(11, 15, 22, 0.98) 100%) padding-box,
    linear-gradient(
      155deg,
      rgba(96, 133, 255, 0.40) 0%,
      rgba(255, 255, 255, 0.12) 30%,
      rgba(6, 182, 212, 0.28) 65%,
      rgba(255, 255, 255, 0.05) 100%
    ) border-box;
  box-shadow:
    var(--shadow-lg),
    0 20px 48px -12px rgba(0, 0, 0, 0.8),
    0 0 36px -8px rgba(59, 102, 255, 0.12);
  overflow: hidden;
  text-align: center;
  padding: clamp(2.25rem, 4.5vw, 3rem) clamp(1.25rem, 3.5vw, 2.5rem) clamp(1.5rem, 3vw, 2rem);
}

/* Restrained Cyan/Blue Ambient Glow centered near upper-middle area */
.onboarding-cta__glow {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 440px;
  height: 220px;
  max-width: 85%;
  background: radial-gradient(
    ellipse at center,
    rgba(59, 102, 255, 0.18) 0%,
    rgba(6, 182, 212, 0.08) 40%,
    transparent 70%
  );
  filter: blur(28px);
  pointer-events: none;
  z-index: 0;
}

/* Subtle Technical Grid Texture (almost invisible, masked to center) */
.onboarding-cta__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse 65% 55% at 50% 30%, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 65% 55% at 50% 30%, black 20%, transparent 80%);
  pointer-events: none;
  z-index: 0;
  opacity: 0.8;
}

/* Vertical Content Stacking */
.onboarding-cta__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* CTA Eyebrow Badge — Refined Subtle Liquid-Sweep (No hard pulse, static dot) */
.onboarding-cta__badge {
  position: relative;
  margin-bottom: var(--space-4);
  border: 1px solid rgba(56, 189, 248, 0.22);
  animation: pillSoftResonance 6s ease-in-out infinite;
  overflow: hidden;
}

.onboarding-cta__badge .badge__dot {
  position: relative;
  animation: none !important;
}

.onboarding-cta__badge .badge__dot::after {
  display: none !important;
}

.onboarding-cta__badge::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    105deg,
    transparent 20%,
    rgba(56, 189, 248, 0.08) 38%,
    rgba(147, 197, 253, 0.22) 50%,
    rgba(56, 189, 248, 0.08) 62%,
    transparent 80%
  );
  background-size: 260% 100%;
  background-position: 180% 0;
  animation: pillLightSweep 6s ease-in-out infinite;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .onboarding-cta__badge,
  .onboarding-cta__badge::before {
    animation: none !important;
  }
}

.onboarding-cta__title {
  font-family: var(--font-sans);
  font-size: clamp(1.5rem, 2.2vw + 0.5rem, 2rem);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  text-wrap: balance;
}

.onboarding-cta__desc {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  max-width: 48ch;
  margin-inline: auto;
  margin-bottom: var(--space-6);
  text-wrap: balance;
}

.onboarding-cta__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/* Primary Download Button: Visually dominant with refined, non-neon premium glow */
.onboarding-cta__btn {
  min-height: 48px;
  padding: var(--space-3) var(--space-8);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  background: linear-gradient(180deg, var(--color-accent-500) 0%, var(--color-accent-600) 100%);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-md);
  box-shadow:
    0 2px 6px rgba(0, 0, 0, 0.45),
    0 0 16px rgba(59, 102, 255, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.onboarding-cta__btn:hover {
  background: linear-gradient(180deg, var(--color-accent-400) 0%, var(--color-accent-500) 100%);
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow:
    0 4px 14px rgba(0, 0, 0, 0.55),
    0 0 24px rgba(59, 102, 255, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.onboarding-cta__btn:active {
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.5),
    0 0 10px rgba(59, 102, 255, 0.18);
}

/* Defined Lower Zone: Subtle Horizontal Separator + Trust Indicators */
.onboarding-cta__footer {
  width: 100%;
  max-width: 580px;
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.onboarding-cta__footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 20%;
  right: 20%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(59, 102, 255, 0.5) 50%,
    transparent 100%
  );
}

.onboarding-cta__meta {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  letter-spacing: var(--tracking-wide);
}

.onboarding-cta__meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  white-space: nowrap;
}

.onboarding-cta__meta-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--status-secure);
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.5);
  flex-shrink: 0;
}

/* Mobile Responsiveness */
@media (max-width: 640px) {
  .onboarding-cta {
    padding: var(--space-6) var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
  }

  .onboarding-cta__desc {
    font-size: var(--text-sm);
    margin-bottom: var(--space-5);
  }

  .onboarding-cta__btn {
    width: 100%;
    max-width: 320px;
  }

  .onboarding-cta__footer {
    margin-top: var(--space-5);
    padding-top: var(--space-3);
  }

  .onboarding-cta__footer::before {
    left: 10%;
    right: 10%;
  }

  .onboarding-cta__meta {
    flex-direction: column;
    gap: var(--space-2);
  }
}