/* ============================================
   S1: CSS Variables + Reset + Base Typography
   ============================================ */
:root {
  --color-primary: #6C5CE7;
  --color-primary-dark: #5A4BD1;
  --color-accent: #00D2FF;
  --color-cta: #FF6B6B;
  --color-cta-dark: #E55A5A;
  --color-bg-start: #0F0F1A;
  --color-bg-end: #1A1A2E;
  --color-text: #FFFFFF;
  --color-text-muted: rgba(255, 255, 255, 0.65);
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-glass-bg: rgba(255, 255, 255, 0.05);
  --color-glass-border: rgba(255, 255, 255, 0.1);
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  --spacing-3xl: 96px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: linear-gradient(135deg, var(--color-bg-start), var(--color-bg-end));
  background-attachment: fixed;
  color: var(--color-text);
  font-family: var(--font-stack);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}
/* ============================================
   S2: Utility Classes + Container + Glass Card + Buttons
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  width: 100%;
}

.glass-card {
  background: var(--color-glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-stack);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  line-height: 1.4;
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 0 30px rgba(108, 92, 231, 0.4);
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-glass-border);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  background: rgba(108, 92, 231, 0.1);
}
.btn--lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.btn--sm {
  padding: 8px 20px;
  font-size: 0.875rem;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, #FFFFFF, rgba(255, 255, 255, 0.8));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================
   S3: Header / Nav
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: var(--spacing-md) 0;
  transition: background var(--transition-base), backdrop-filter var(--transition-base);
}

.header.scrolled {
  background: rgba(15, 15, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-glass-border);
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav__logo {
  display: flex;
  align-items: center;
}

.logo-gamma {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav__link {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link:hover {
  color: var(--color-text);
}

.nav__link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.nav__link:hover::after {
  width: 100%;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 12px;
}
.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-fast);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ============================================
   S4: Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at 50% 50%, rgba(108, 92, 231, 0.15), transparent 70%);
  pointer-events: none;
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  pointer-events: none;
  animation: float 8s ease-in-out infinite;
}

.hero__orb--1 {
  width: 400px;
  height: 400px;
  background: var(--color-primary);
  top: 10%;
  left: 15%;
  animation-delay: 0s;
}

.hero__orb--2 {
  width: 300px;
  height: 300px;
  background: var(--color-accent);
  top: 50%;
  right: 10%;
  animation-delay: -3s;
}
.hero__orb--3 {
  width: 250px;
  height: 250px;
  background: var(--color-cta);
  bottom: 15%;
  left: 50%;
  animation-delay: -5s;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 var(--spacing-lg);
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, #FFFFFF, rgba(255, 255, 255, 0.7));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.hero__note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ============================================
   S5: Features Grid
   ============================================ */
.features {
  padding: var(--spacing-3xl) 0;
}
.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  padding: 32px;
  transition: transform var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
}

.feature-card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.feature-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.feature-card__before {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.feature-card__after {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ============================================
   S6: How It Works Steps
   ============================================ */
.how-it-works {
  padding: var(--spacing-3xl) 0;
}

.steps__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.step-card {
  text-align: center;
  padding: 40px;
}

.step-card__number {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 auto var(--spacing-md);
  color: var(--color-text);
}

.step-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.step-card__desc {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ============================================
   S7: Use Cases
   ============================================ */
.use-cases {
  padding: var(--spacing-3xl) 0;
}

.use-cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.use-case-card {
  padding: 32px;
}

.use-case-card__emoji {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.use-case-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.use-case-card__story {
  line-height: 1.7;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}
/* ============================================
   S8: Testimonials
   ============================================ */
.testimonials {
  padding: var(--spacing-3xl) 0;
}

.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.testimonial-card {
  padding: 32px;
}

.testimonial-card__quote {
  font-size: 1.05rem;
  font-style: italic;
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-top: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.testimonial-card__quote::before {
  content: "\201C";
  position: absolute;
  top: -8px;
  left: 0;
  font-size: 3.5rem;
  color: var(--color-primary);
  font-style: normal;
  line-height: 1;
  opacity: 0.5;
}

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

.testimonial-card__avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.testimonial-card__name {
  font-weight: 600;
  font-size: 0.95rem;
}

.testimonial-card__role {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ============================================
   S9: Comparison Table
   ============================================ */
.comparison {
  padding: var(--spacing-3xl) 0;
}

.comparison__table-wrap {
  overflow-x: auto;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  background: var(--color-glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
}

.comparison__table {
  width: 100%;
  border-collapse: collapse;
}

.comparison__table th {
  padding: 16px;
  text-align: left;
  border-bottom: 2px solid var(--color-glass-border);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

.comparison__table td {
  padding: 16px;
  border-bottom: 1px solid var(--color-glass-border);
  font-size: 0.95rem;
}

.comparison__table tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.comparison__table .highlight {
  color: var(--color-primary);
  font-weight: 600;
  background: rgba(108, 92, 231, 0.05);
}
/* ============================================
   S10: FAQ
   ============================================ */
.faq {
  padding: var(--spacing-3xl) 0;
}

.faq__list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.faq__item {
  padding: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
}

.faq__question {
  padding: 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.1rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color var(--transition-fast);
}

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__question::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-text-muted);
  transition: transform var(--transition-base);
  flex-shrink: 0;
  margin-left: var(--spacing-md);
}

details[open] .faq__question::after {
  transform: rotate(45deg);
}

.faq__answer {
  padding: 0 24px 24px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}
/* ============================================
   S11: CTA Banner + Footer
   ============================================ */
.cta-banner {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.cta-banner__content {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
}

.cta-banner__title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

.cta-banner__subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--spacing-lg);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.cta-banner__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
}

.footer {
  padding: var(--spacing-2xl) 0 32px;
  border-top: 1px solid var(--color-glass-border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer__logo {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer__tagline {
  color: var(--color-text-muted);
  margin-top: var(--spacing-sm);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer__heading {
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.footer__links li {
  margin-bottom: var(--spacing-sm);
}

.footer__links li a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  font-size: 0.9rem;
}

.footer__links li a:hover {
  color: var(--color-text);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  margin-top: var(--spacing-xl);
  border-top: 1px solid var(--color-glass-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer__social {
  display: flex;
  gap: var(--spacing-md);
}

.footer__social a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  font-size: 1.1rem;
}

.footer__social a:hover {
  color: var(--color-text);
}
/* ============================================
   S12: Keyframe Animations
   ============================================ */
@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-30px);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.btn--cta-pulse {
  animation: pulse 2.5s ease-in-out infinite;
}

/* ── Back to top button ── */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-text);
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-fast);
  z-index: 900;
  box-shadow: 0 4px 20px rgba(108, 92, 231, 0.4);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
}

/* ── Table scroll hint for mobile ── */
.comparison__table-wrap {
  position: relative;
}

.comparison__table-wrap::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 100%;
  background: linear-gradient(to left, var(--color-bg-end), transparent);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-base);
}

/* ============================================
   S13: Responsive Breakpoints
   ============================================ */
@media (max-width: 1024px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

@media (max-width: 768px) {
  .nav__menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(15, 15, 26, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
  }

  .nav__menu.active {
    opacity: 1;
    visibility: visible;
  }

  .nav__menu .nav__link {
    font-size: 1.25rem;
  }

  .nav__toggle {
    display: flex;
    z-index: 1001;
  }
  .features__grid {
    grid-template-columns: 1fr;
  }

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

  .use-cases__grid {
    grid-template-columns: 1fr;
  }

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

  .hero__title {
    font-size: clamp(2rem, 5vw, 3rem);
  }

  .hero__subtitle {
    font-size: 1.1rem;
  }

  .comparison__table {
    font-size: 0.85rem;
  }

  .comparison__table th,
  .comparison__table td {
    padding: 12px;
  }

  .comparison__table-wrap::after {
    opacity: 1;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .cta-banner__content {
    padding: var(--spacing-xl) var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .hero__cta {
    flex-direction: column;
  }

  .hero__cta .btn {
    width: 100%;
  }

  .hero__title {
    font-size: 1.75rem;
  }
  .hero__subtitle {
    font-size: 1rem;
  }

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

  .section-subtitle {
    font-size: 1rem;
  }

  .feature-card,
  .step-card,
  .use-case-card,
  .testimonial-card {
    padding: 24px;
  }

  .cta-banner__title {
    font-size: 1.5rem;
  }

  .cta-banner__content {
    padding: var(--spacing-lg);
  }

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .hero__orb {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn--cta-pulse {
    animation: none;
  }
}