/* ==========================================================================
   AImHigh Landing Page — Main Stylesheet
   ========================================================================== */

/* ---------- CSS Variables ---------- */
:root {
  --color-bg-dark: #0a0a1a;
  --color-bg-dark-2: #1a1a2e;
  --color-bg-dark-3: #16213e;
  --color-accent: #0f3460;
  --color-primary: #e94560;
  --color-primary-hover: #d63851;
  --color-secondary: #533483;
  --color-gradient-start: #e94560;
  --color-gradient-end: #533483;
  --color-text-light: #ffffff;
  --color-text-dark: #1a1a2e;
  --color-text-muted: #a0a0b0;
  --color-text-muted-dark: #6b7280;
  --color-bg-light: #f8f9fa;
  --color-bg-white: #ffffff;
  --color-card-shadow: rgba(0, 0, 0, 0.08);
  --color-card-shadow-dark: rgba(0, 0, 0, 0.3);
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --nav-height: 72px;
  --border-radius: 12px;
  --container-max: 1200px;
  --transition-speed: 0.3s;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-dark);
  background: var(--color-bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

/* ---------- Skip Link (Accessibility) ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: 8px 16px;
  border-radius: 4px;
  z-index: 10000;
  font-weight: 600;
}

.skip-link:focus {
  top: 8px;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Section Spacing ---------- */
.section {
  padding: 96px 0;
}

.section-dark {
  background: var(--color-bg-dark-2);
  color: var(--color-text-light);
}

.section-light {
  background: var(--color-bg-light);
}

.section-white {
  background: var(--color-bg-white);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
  opacity: 0.85;
  line-height: 1.7;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  z-index: 1000;
  transition: background var(--transition-speed), box-shadow var(--transition-speed);
}

.navbar.scrolled {
  background: rgba(10, 10, 26, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.3);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text-light);
  letter-spacing: -0.02em;
}

.nav-logo span {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  font-weight: 500;
  opacity: 0.85;
  transition: opacity var(--transition-speed);
}

.nav-links a:hover,
.nav-links a.active {
  opacity: 1;
}

.nav-links .nav-cta {
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  opacity: 1;
  transition: background var(--transition-speed), transform var(--transition-speed);
}

.nav-links .nav-cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-light);
  border-radius: 2px;
  transition: transform var(--transition-speed), opacity var(--transition-speed);
}

.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(160deg, var(--color-bg-dark) 0%, var(--color-bg-dark-2) 40%, var(--color-bg-dark-3) 70%, var(--color-accent) 100%);
  color: var(--color-text-light);
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-content {
  max-width: 560px;
}

.hero-badge {
  display: inline-block;
  background: rgba(233, 69, 96, 0.15);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 24px;
  margin-bottom: 24px;
  border: 1px solid rgba(233, 69, 96, 0.3);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.85;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-light);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.35);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-light);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

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

.hero-trust {
  font-size: 0.875rem;
  opacity: 0.6;
}

/* Hero Phone Mockup Placeholder */
.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  width: 300px;
  height: 600px;
  background: linear-gradient(160deg, var(--color-bg-dark-3), var(--color-secondary));
  border-radius: 36px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0;
  text-align: center;
  position: relative;
  box-shadow: 0 32px 64px rgba(0, 0, 0, 0.4);
  overflow: hidden;
}

.phone-mockup::before {
  content: '';
  position: absolute;
  top: 12px;
  width: 80px;
  height: 6px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
  z-index: 2;
}

.phone-mockup .placeholder-label {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.5;
  padding: 16px;
}

.phone-screenshot {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 33px;
}

/* ---------- Social Proof Bar ---------- */
.social-proof {
  padding: 48px 0;
  background: var(--color-bg-white);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.stats-row {
  display: flex;
  justify-content: center;
  gap: 64px;
  flex-wrap: wrap;
}

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

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.9375rem;
  color: var(--color-text-muted-dark);
  margin-top: 4px;
}

/* ---------- Features ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--color-bg-white);
  border-radius: var(--border-radius);
  padding: 36px 28px;
  box-shadow: 0 4px 24px var(--color-card-shadow);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

.feature-icon.icon-slicer { background: rgba(233, 69, 96, 0.1); color: var(--color-primary); }
.feature-icon.icon-gamification { background: rgba(83, 52, 131, 0.1); color: var(--color-secondary); }
.feature-icon.icon-chat { background: rgba(15, 52, 96, 0.1); color: var(--color-accent); }
.feature-icon.icon-journal { background: rgba(16, 185, 129, 0.1); color: #10b981; }
.feature-icon.icon-notifications { background: rgba(245, 158, 11, 0.1); color: #f59e0b; }
.feature-icon.icon-analytics { background: rgba(59, 130, 246, 0.1); color: #3b82f6; }

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text-dark);
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted-dark);
  line-height: 1.65;
}

/* Feature image placeholder */
.feature-img-placeholder {
  width: 100%;
  height: 220px;
  background: linear-gradient(135deg, var(--color-bg-dark-3), var(--color-bg-dark-2));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  overflow: hidden;
}

.feature-img-placeholder .placeholder-label {
  font-size: 0.75rem;
  color: var(--color-text-muted-dark);
  text-align: center;
  padding: 12px;
  line-height: 1.4;
}

.feature-screenshot {
  height: 100%;
  width: auto;
  object-fit: contain;
}

/* ---------- How It Works ---------- */
.steps-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  position: relative;
}

.steps-container::before {
  content: '';
  position: absolute;
  top: 40px;
  left: calc(16.66% + 24px);
  right: calc(16.66% + 24px);
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  opacity: 0.4;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: var(--color-text-light);
  font-size: 1.75rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  position: relative;
  z-index: 1;
}

.step h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step p {
  font-size: 0.9375rem;
  opacity: 0.8;
  line-height: 1.65;
  max-width: 320px;
  margin: 0 auto;
}

.step-img-placeholder {
  width: 200px;
  height: 380px;
  background: linear-gradient(160deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
  border-radius: 28px;
  border: 2px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 24px auto 0;
  overflow: hidden;
}

.step-img-placeholder .placeholder-label {
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.35);
  text-align: center;
  padding: 16px;
  line-height: 1.4;
}

.step-screenshot {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 26px;
}

/* ---------- Pricing ---------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 960px;
  margin: 0 auto;
}

.pricing-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: 40px 32px;
  text-align: center;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.pricing-card:hover {
  transform: translateY(-6px);
}

.pricing-card.popular {
  background: rgba(233, 69, 96, 0.08);
  border-color: var(--color-primary);
  position: relative;
}

.pricing-card.popular::before {
  content: 'Most Popular';
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: var(--color-text-light);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 20px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 800;
  margin: 16px 0 4px;
}

.pricing-period {
  font-size: 0.875rem;
  opacity: 0.6;
  margin-bottom: 8px;
}

.pricing-save {
  display: inline-block;
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 16px;
  margin-bottom: 24px;
}

.pricing-features {
  text-align: left;
  margin-bottom: 32px;
}

.pricing-features li {
  font-size: 0.9375rem;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0.85;
}

.pricing-features li::before {
  content: '\2713';
  color: #10b981;
  font-weight: 700;
}

/* Elite (gold accent) card */
.pricing-card.elite {
  background: rgba(212, 175, 55, 0.06);
  border-color: #d4af37;
  position: relative;
}

.pricing-card.elite::before {
  content: 'Best Value';
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #d4af37, #b8860b);
  color: #0a0a1a;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 20px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card.elite:hover {
  box-shadow: 0 12px 40px rgba(212, 175, 55, 0.15);
}

/* Pro card: pricing options (multi-price layout) */
.pricing-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 16px 0 24px;
}

.pricing-option {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.pricing-option-price {
  font-size: 1.5rem;
  font-weight: 800;
}

.pricing-option-period {
  font-size: 0.875rem;
  opacity: 0.6;
}

/* AI tier tag */
.pricing-ai-tag {
  display: inline-block;
  background: rgba(233, 69, 96, 0.12);
  color: var(--color-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 16px;
  margin-bottom: 20px;
}

.pricing-ai-tag-gold {
  background: rgba(212, 175, 55, 0.15);
  color: #d4af37;
}

/* Gold CTA button */
.btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  background: linear-gradient(135deg, #d4af37, #b8860b);
  color: #0a0a1a;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(212, 175, 55, 0.3);
}

.pricing-note {
  text-align: center;
  margin-top: 40px;
  font-size: 0.875rem;
  opacity: 0.6;
}

/* ---------- Final CTA ---------- */
.cta-section {
  padding: 96px 0;
  background: linear-gradient(160deg, var(--color-bg-dark) 0%, var(--color-bg-dark-2) 40%, var(--color-accent) 100%);
  color: var(--color-text-light);
  text-align: center;
}

.cta-section h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-section p {
  font-size: 1.125rem;
  opacity: 0.8;
  margin-bottom: 40px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cta-section .btn-primary {
  font-size: 1.125rem;
  padding: 16px 40px;
}

.cta-note {
  margin-top: 16px;
  font-size: 0.8125rem;
  opacity: 0.5;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  margin-top: 12px;
  font-size: 0.9375rem;
  opacity: 0.6;
  max-width: 320px;
  line-height: 1.6;
}

.footer h4 {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.5;
  margin-bottom: 20px;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 0.9375rem;
  opacity: 0.7;
  transition: opacity var(--transition-speed);
}

.footer-links a:hover {
  opacity: 1;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  font-size: 0.8125rem;
  opacity: 0.4;
}

.footer-bottom a {
  font-size: 0.8125rem;
  opacity: 0.5;
  transition: opacity var(--transition-speed);
}

.footer-bottom a:hover {
  opacity: 0.8;
}

/* ---------- Scroll Animations ---------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive: Tablet (768px) ---------- */
@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .section-title {
    font-size: 1.875rem;
  }

  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 10, 26, 0.98);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

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

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

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-ctas {
    justify-content: center;
  }

  .hero-image {
    display: none;
  }

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

  .steps-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .steps-container::before {
    display: none;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .stats-row {
    gap: 32px;
  }
}

/* ---------- Responsive: Mobile (480px) ---------- */
@media (max-width: 480px) {
  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 56px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1.0625rem;
  }

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

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

  .hero-ctas {
    flex-direction: column;
  }

  .pricing-price {
    font-size: 2rem;
  }

  .cta-section h2 {
    font-size: 1.875rem;
  }
}