/* ========================================
   Recall Flow — Design System
   Apple-inspired, dark-mode-first
   ======================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* --- Custom Properties --- */
:root {
  /* Colors */
  --color-bg:           #000000;
  --color-bg-elevated:  #0d0d0d;
  --color-bg-card:      rgba(28, 28, 30, 0.65);
  --color-surface:      #1c1c1e;
  --color-border:       rgba(255, 255, 255, 0.08);
  --color-text-primary: #f5f5f7;
  --color-text-secondary: rgba(245, 245, 247, 0.6);
  --color-text-tertiary: rgba(245, 245, 247, 0.35);
  --color-accent-start: #5E5CE6;
  --color-accent-end:   #BF5AF2;
  --color-accent:       #5E5CE6;
  --color-accent-hover: #7D7AFF;
  --gradient-accent:    linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
  --gradient-glow:      radial-gradient(ellipse at 50% 0%, rgba(94,92,230,0.15) 0%, transparent 60%);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  --font-size-xs:   0.75rem;   /* 12px */
  --font-size-sm:   0.875rem;  /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg:   1.125rem;  /* 18px */
  --font-size-xl:   1.25rem;   /* 20px */
  --font-size-2xl:  1.5rem;    /* 24px */
  --font-size-3xl:  2rem;      /* 32px */
  --font-size-4xl:  2.75rem;   /* 44px */
  --font-size-5xl:  3.5rem;    /* 56px */
  --font-size-6xl:  4.5rem;    /* 72px */

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --border-radius-xl: 28px;
  --border-radius-full: 9999px;

  /* Effects */
  --glass-blur: 20px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 64px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 40px rgba(94,92,230,0.3);

  /* Transitions */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s var(--ease-out-expo);
  --transition-base: 0.4s var(--ease-out-expo);
  --transition-slow: 0.8s var(--ease-out-expo);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* --- Utility Classes --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  position: relative;
  padding: var(--space-5xl) 0;
  overflow: hidden;
}

.section-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.text-center {
  text-align: center;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: background var(--transition-base), backdrop-filter var(--transition-base);
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: saturate(180%) blur(var(--glass-blur));
  -webkit-backdrop-filter: saturate(180%) blur(var(--glass-blur));
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--border-radius-sm);
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.nav-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  font-weight: 500;
}

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

.nav-cta {
  padding: 8px 20px;
  border-radius: var(--border-radius-full);
  background: var(--gradient-accent);
  color: white !important;
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-cta:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-mobile-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(94, 92, 230, 0.12) 0%, rgba(191, 90, 242, 0.06) 40%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-2xl);
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px 6px 8px;
  border-radius: var(--border-radius-full);
  background: rgba(94, 92, 230, 0.12);
  border: 1px solid rgba(94, 92, 230, 0.25);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-accent-hover);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero h1 {
  font-size: var(--font-size-6xl);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  max-width: 800px;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  max-width: 540px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  border-radius: var(--border-radius-full);
  background: var(--gradient-accent);
  color: white;
  font-weight: 600;
  font-size: var(--font-size-base);
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  text-decoration: none;
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: var(--shadow-glow);
}

.btn-primary svg {
  width: 20px;
  height: 20px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  border-radius: var(--border-radius-full);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.hero-mockup {
  position: relative;
  margin-top: var(--space-xl);
}

.hero-mockup img {
  width: 340px;
  height: auto;
  filter: drop-shadow(0 30px 80px rgba(94, 92, 230, 0.25));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

.hero-mockup::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: 50%;
  transform: translateX(-50%);
  width: 260px;
  height: 60px;
  background: radial-gradient(ellipse, rgba(94, 92, 230, 0.2) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(20px);
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* --- Divider Glow --- */
.section-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(94, 92, 230, 0.3), transparent);
}

/* --- Features Section --- */
.features {
  background: var(--gradient-glow);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.feature-card {
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  background: var(--color-bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--border-radius-lg);
  background: linear-gradient(180deg, rgba(94, 92, 230, 0.06) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(94, 92, 230, 0.2);
  box-shadow: var(--shadow-md);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-md);
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  font-size: 22px;
  position: relative;
  z-index: 1;
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  position: relative;
  z-index: 1;
}

.feature-card p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* --- How It Works --- */
.how-it-works {
  position: relative;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-4xl);
  margin-top: var(--space-3xl);
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  left: 39px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent-start), var(--color-accent-end), transparent);
}

.step {
  display: flex;
  gap: var(--space-2xl);
  align-items: flex-start;
}

.step-number {
  width: 80px;
  height: 80px;
  min-width: 80px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent-start);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  z-index: 1;
}

.step-content {
  padding-top: var(--space-md);
}

.step-content h3 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.step-content p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 500px;
}

/* --- AI Section --- */
.ai-section {
  position: relative;
}

.ai-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 900px;
  height: 900px;
  background: radial-gradient(circle, rgba(191, 90, 242, 0.08) 0%, rgba(94, 92, 230, 0.04) 40%, transparent 70%);
  pointer-events: none;
}

.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  margin-top: var(--space-3xl);
}

.ai-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-orb {
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--color-accent-start), var(--color-accent-end), #FF375F, var(--color-accent-start));
  filter: blur(60px);
  opacity: 0.4;
  animation: orb-rotate 8s linear infinite;
}

@keyframes orb-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.ai-orb-inner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-orb-inner svg {
  width: 80px;
  height: 80px;
  color: var(--color-text-primary);
  opacity: 0.9;
}

.ai-capabilities {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.ai-capability {
  padding: var(--space-xl);
  border-radius: var(--border-radius-lg);
  background: var(--color-bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.ai-capability:hover {
  border-color: rgba(191, 90, 242, 0.3);
  transform: translateX(8px);
}

.ai-capability h4 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.ai-capability p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.6;
}

/* --- Testimonials --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.testimonial-card {
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  background: var(--color-bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: rgba(94, 92, 230, 0.2);
}

.testimonial-stars {
  display: flex;
  gap: 2px;
  margin-bottom: var(--space-md);
  color: #FFD60A;
  font-size: var(--font-size-sm);
}

.testimonial-card blockquote {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-sm);
}

.testimonial-author-info .name {
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.testimonial-author-info .role {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

/* --- CTA Section --- */
.cta-section {
  position: relative;
  text-align: center;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, transparent, rgba(94, 92, 230, 0.06) 40%, rgba(191, 90, 242, 0.04) 60%, transparent);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-content h2 {
  font-size: var(--font-size-5xl);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.cta-content p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}

/* --- Footer --- */
.footer {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.footer-logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: var(--space-2xl);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

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

.footer-copy {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .section-title {
    font-size: var(--font-size-3xl);
  }

  .hero h1 {
    font-size: var(--font-size-5xl);
  }

  .features-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .ai-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .ai-visual {
    order: -1;
  }

  .ai-orb {
    width: 240px;
    height: 240px;
  }

  .ai-capabilities {
    align-items: center;
  }

  .ai-capability {
    max-width: 500px;
    width: 100%;
  }
}

@media (max-width: 768px) {
  :root {
    --space-5xl: 5rem;
  }

  .hero h1 {
    font-size: var(--font-size-4xl);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .cta-content h2 {
    font-size: var(--font-size-3xl);
  }

  .hero-mockup img {
    width: 280px;
  }

  .features-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
    z-index: 998;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: var(--font-size-2xl);
  }

  .nav-mobile-toggle {
    display: flex;
    z-index: 999;
    position: relative;
  }

  .nav-mobile-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-mobile-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .nav-mobile-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary, .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .steps::before {
    left: 19px;
  }

  .step-number {
    width: 40px;
    height: 40px;
    min-width: 40px;
    font-size: var(--font-size-base);
  }

  .step {
    gap: var(--space-lg);
  }

  .step-content h3 {
    font-size: var(--font-size-xl);
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-xl);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: var(--font-size-3xl);
  }

  .container {
    padding: 0 var(--space-md);
  }
}