/* ============================================
   CSS Custom Properties (Design System)
   ============================================ */

:root {
  /* Colors */
  --color-bg: #0a0e1a;
  --color-text: #FFFFFF;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-tertiary: rgba(255, 255, 255, 0.5);
  --color-accent: #00D4E8;
  --color-accent-hover: #00B8D4;
  --color-glass: rgba(255, 255, 255, 0.05);
  --color-glass-hover: rgba(255, 255, 255, 0.08);
  --color-border: rgba(255, 255, 255, 0.1);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-secondary: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;

  --font-size-xs: 0.875rem;     /* 14px */
  --font-size-sm: 1rem;          /* 16px */
  --font-size-base: 1.125rem;    /* 18px */
  --font-size-lg: 1.25rem;       /* 20px */
  --font-size-xl: 1.5rem;        /* 24px */
  --font-size-2xl: 2rem;         /* 32px */
  --font-size-3xl: 3rem;         /* 48px */
  --font-size-4xl: 4.5rem;       /* 72px */

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing - Balanced and intelligent */
  --space-xs: 0.5rem;    /* 8px */
  --space-sm: 1rem;      /* 16px */
  --space-md: 1.5rem;    /* 24px */
  --space-lg: 2rem;      /* 32px */
  --space-xl: 3rem;      /* 48px */
  --space-2xl: 4rem;     /* 64px */
  --space-3xl: 6rem;     /* 96px */
  --space-4xl: 8rem;     /* 128px */

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 17px;
  --radius-lg: 24px;
  --radius-full: 100px;

  /* Effects */
  --blur-sm: 10px;
  --blur-md: 15px;
  --blur-lg: 25px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-glow: 0 0 20px rgba(0, 204, 255, 0.3);
  --shadow-glow-hover: 0 0 30px rgba(0, 204, 255, 0.5);

  /* Container */
  --container-max-width: 1280px;
  --container-padding: 1.5rem;
}

/* ============================================
   Base Styles
   ============================================ */

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

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
}

@media (min-width: 810px) {
  h1 {
    font-size: 3.5rem;
    margin-bottom: var(--space-lg);
  }

  h2 {
    font-size: 2.5rem;
    margin-bottom: var(--space-lg);
  }
}

p {
  line-height: var(--line-height-relaxed);
}

/* ============================================
   Layout
   ============================================ */

.container {
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

@media (min-width: 810px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

@media (min-width: 1200px) {
  .container {
    padding-left: 3rem;
    padding-right: 3rem;
  }
}

/* ============================================
   Navigation
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-md) 0;
}

.nav.scrolled {
  background-color: rgba(10, 14, 26, 0.8);
  backdrop-filter: blur(20px);
}

.nav__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

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

.nav__logo img {
  border-radius: 12px;
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-xl);
  flex: 1;
  justify-content: center;
}

@media (min-width: 810px) {
  .nav__links {
    display: flex;
  }
}

.nav__links a {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.2s var(--ease-smooth);
  position: relative;
}

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

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s var(--ease-out-expo);
}

.nav__links a:hover::after {
  width: 100%;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.875rem 1.75rem;
  font-family: var(--font-secondary);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 0 0 rgba(0, 204, 255, 0);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 20px rgba(0, 204, 255, 0.4);
  transform: translateY(-1px);
}

.btn--large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn--nav {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 6rem;
  padding-bottom: var(--space-3xl);
}

.hero__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

@media (min-width: 810px) {
  .hero__content {
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-3xl);
  }
}

.hero__eyebrow {
  font-family: var(--font-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
}

.hero__headline {
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, #FFFFFF 0%, rgba(255, 255, 255, 0.9) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.hero__subheadline {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 540px;
}

@media (min-width: 810px) {
  .hero__subheadline {
    font-size: 1.25rem;
  }
}

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

.hero__image {
  width: 100%;
  max-width: 240px;
  height: auto;
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-accent);
  box-shadow: 0 0 30px rgba(0, 204, 255, 0.4),
              0 30px 80px rgba(0, 204, 255, 0.15);
}

@media (min-width: 810px) {
  .hero__image {
    max-width: 260px;
  }
}

@media (min-width: 1200px) {
  .hero__image {
    max-width: 280px;
  }
}

/* ============================================
   Hook Section
   ============================================ */

.hook {
  padding: var(--space-4xl) 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 204, 255, 0.02) 50%, transparent 100%);
}

.hook__content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.hook__headline {
  margin-bottom: var(--space-lg);
  color: var(--color-text);
  font-size: 2rem;
}

.hook__text {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

@media (min-width: 810px) {
  .hook__headline {
    font-size: 2.25rem;
  }

  .hook__text {
    font-size: 1.25rem;
  }
}

/* ============================================
   Features Section
   ============================================ */

.features {
  padding: var(--space-4xl) 0;
}

.section__title {
  text-align: center;
  margin-bottom: var(--space-3xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 810px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }
}

@media (min-width: 1200px) {
  .features__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
  }
}

.feature-card {
  padding: 0;
  transition: all var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-2px);
}

.feature-card:hover .feature-card__icon img {
  filter: drop-shadow(0 0 12px rgba(0, 204, 255, 0.6));
}

.feature-card__icon {
  margin-bottom: var(--space-lg);
  width: 56px;
  height: 56px;
}

.feature-card__icon img {
  filter: drop-shadow(0 0 8px rgba(0, 204, 255, 0.4));
  transition: filter 0.3s ease;
}

.feature-card__title {
  margin-bottom: var(--space-md);
  color: var(--color-text);
  font-size: 1.25rem;
}

.feature-card__description {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ============================================
   How It Works Section
   ============================================ */

.how-it-works {
  padding: var(--space-4xl) 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 204, 255, 0.015) 50%, transparent 100%);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 6rem;
  max-width: 1200px;
  margin: 0 auto;
}

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

@media (min-width: 810px) {
  .step {
    grid-template-columns: 1fr auto;
    gap: var(--space-3xl);
  }
}

.step__content {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-lg);
  align-items: start;
}

@media (max-width: 809px) {
  .step__content {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}

.step__number {
  font-family: var(--font-secondary);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-accent);
  opacity: 0.6;
  min-width: 80px;
  letter-spacing: -0.02em;
  line-height: 1;
}

.step__text {
  flex: 1;
}

.step__title {
  margin-bottom: var(--space-md);
  font-size: 1.75rem;
  font-weight: 700;
}

.step__description {
  color: var(--color-text-secondary);
  max-width: 500px;
  line-height: 1.7;
  font-size: 1rem;
}

.step__image {
  display: flex;
  justify-content: center;
  align-items: center;
  order: 2;
}

@media (max-width: 809px) {
  .step__image {
    order: 1;
  }
}

.step__image img {
  max-width: 220px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-accent);
  box-shadow: 0 0 20px rgba(0, 204, 255, 0.3);
  object-fit: contain;
}

@media (min-width: 810px) {
  .step__image img {
    max-width: 280px;
  }
}

/* ============================================
   Showcase Section
   ============================================ */

.showcase {
  padding: var(--space-4xl) 0;
}

.showcase__gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  max-width: 1100px;
  margin: 0 auto;
  justify-items: center;
}

@media (min-width: 810px) {
  .showcase__gallery {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
  }
}

.showcase__item {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.showcase__item:hover {
  transform: translateY(-6px) scale(1.02);
}

.showcase__item img {
  max-width: 180px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-accent);
  box-shadow: 0 0 20px rgba(0, 204, 255, 0.3);
  object-fit: contain;
  transition: all 0.5s var(--ease-out-expo);
}

@media (min-width: 810px) {
  .showcase__item img {
    max-width: 200px;
  }
}

.showcase__item:hover img {
  box-shadow: 0 0 30px rgba(0, 204, 255, 0.5),
              0 20px 60px rgba(0, 204, 255, 0.2);
}

/* ============================================
   Final CTA Section
   ============================================ */

.final-cta {
  padding: var(--space-4xl) 0;
  margin-top: var(--space-2xl);
  background: radial-gradient(ellipse at center, rgba(0, 204, 255, 0.05) 0%, transparent 70%);
}

.final-cta__content {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.final-cta__headline {
  margin-bottom: var(--space-lg);
  font-size: 2rem;
}

@media (min-width: 810px) {
  .final-cta__headline {
    font-size: 2.5rem;
  }
}

.final-cta__text {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.final-cta__note {
  margin-top: var(--space-md);
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

/* ============================================
   Footer
   ============================================ */

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

.footer__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  align-items: center;
  text-align: center;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-secondary);
  font-size: 1.125rem;
  font-weight: 700;
}

.footer__brand img {
  border-radius: 12px;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  justify-content: center;
}

.footer__links a {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

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

.footer__copyright {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
  margin-top: var(--space-sm);
}

/* ============================================
   Utility Classes
   ============================================ */

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

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