/* AlbaChat Landing Page - Main Styles */
/* Mobile-first responsive design */

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

:root {
  /* Color Palette */
  --color-sunrise-orange: #FF6B35;
  --color-sunrise-yellow: #FFB347;
  --color-dawn-purple: #7C3AED;
  --color-twilight-purple: #4C1D95;
  --color-night-dark: #0F0A1A;
  --color-text-light: #F5F5F7;
  --color-text-muted: #A1A1AA;

  /* Gradients */
  --gradient-sunrise: linear-gradient(135deg, var(--color-sunrise-orange) 0%, var(--color-sunrise-yellow) 100%);
  --gradient-sky: linear-gradient(180deg, var(--color-night-dark) 0%, var(--color-twilight-purple) 50%, var(--color-sunrise-orange) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-sunrise-orange) 0%, var(--color-dawn-purple) 100%);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: clamp(1.875rem, 4vw, 2.5rem);
  --font-size-4xl: clamp(2rem, 5vw, 3rem);
  --font-size-5xl: clamp(2.5rem, 6vw, 3.5rem);

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 1rem;
  --border-radius-xl: 1.5rem;
  --border-radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 40px rgba(255, 107, 53, 0.3);
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-light);
  background-color: var(--color-night-dark);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* ========================================
   Accessibility
   ======================================== */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 1000;
  padding: var(--space-3) var(--space-4);
  background: var(--color-sunrise-orange);
  color: var(--color-night-dark);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--border-radius-md);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-sunrise-orange);
  outline-offset: 2px;
}

/* ========================================
   Header
   ======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: linear-gradient(135deg, var(--color-sunrise-orange) 0%, var(--color-dawn-purple) 100%);
  border-bottom: none;
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.header__logo {
  display: flex;
  align-items: center;
  transition: opacity var(--transition-fast);
}

.header__logo:hover {
  opacity: 0.9;
}

.header__logo-image {
  height: 64px;
  width: auto;
}

.header__badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  background: var(--gradient-accent);
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--border-radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
  background: #FFFFFF;
}

.hero__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-10);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
  text-align: center;
}

.hero__content {
  max-width: 600px;
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-6);
  color: var(--color-night-dark);
}

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

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: #4a4a4a;
  line-height: var(--line-height-relaxed);
}

.hero__illustration {
  position: relative;
  width: 100%;
  max-width: 400px;
  aspect-ratio: 4/3;
}

.hero__families {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero__family {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.hero__family--active {
  opacity: 1;
}

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

.features {
  position: relative;
  padding: var(--space-20) var(--space-4);
  background: linear-gradient(180deg, transparent 0%, rgba(15, 10, 26, 0.95) 20%);
}

.features__container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-8);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--border-radius-xl);
  transition: transform var(--transition-normal), background var(--transition-normal);
}

.feature:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.05);
}

.feature__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  margin-bottom: var(--space-6);
  background: var(--gradient-accent);
  border-radius: var(--border-radius-lg);
  color: var(--color-text-light);
}

.feature__icon svg {
  width: 36px;
  height: 36px;
}

.feature__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-3);
}

.feature__description {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
}

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

.footer {
  padding: var(--space-12) var(--space-4);
  background: var(--color-night-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__container {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer__text {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--space-4);
}

.footer__heart {
  color: var(--color-sunrise-orange);
  display: inline-block;
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ========================================
   Responsive Breakpoints
   ======================================== */

/* Tablet (640px and up) */
@media (min-width: 640px) {
  .header__container {
    padding: 0 var(--space-6);
  }

  .hero__container {
    padding: var(--space-12) var(--space-6);
  }

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

  .hero__subtitle {
    font-size: var(--font-size-xl);
  }

  .hero__illustration {
    max-width: 500px;
  }

  .features {
    padding: var(--space-24) var(--space-6);
  }

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

  .features__grid .feature:last-child {
    grid-column: 1 / -1;
    max-width: 400px;
    margin: 0 auto;
  }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
  .header__container {
    padding: 0 var(--space-8);
  }

  .hero__container {
    flex-direction: row;
    justify-content: center;
    align-items: center;
    text-align: left;
    padding: var(--space-16) var(--space-8);
    gap: var(--space-16);
  }

  .hero__content {
    flex: 0 0 auto;
    max-width: 450px;
  }

  .hero__illustration {
    flex: 0 0 auto;
    max-width: 450px;
  }

  .features {
    padding: var(--space-24) var(--space-8);
  }

  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .features__grid .feature:last-child {
    grid-column: auto;
    max-width: none;
    margin: 0;
  }

  .footer {
    padding: var(--space-16) var(--space-8);
  }
}

/* Large desktop (1280px and up) */
@media (min-width: 1280px) {
  .hero__container {
    gap: var(--space-20);
  }

  .hero__content {
    max-width: 500px;
  }

  .hero__illustration {
    max-width: 500px;
  }
}

/* ========================================
   Reduced Motion Support
   ======================================== */

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

  .hero__family {
    transition: none;
  }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
  .header,
  .hero__background,
  .hero__orbs {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .hero {
    min-height: auto;
    padding-top: 0;
  }

  .hero__title-accent {
    -webkit-text-fill-color: var(--color-sunrise-orange);
  }
}