/* ===================================
   Gem Spin: Match Spark - Main Styles
   Mobile-First Approach
   =================================== */

/* CSS Variables - Dopamine Bright Color Scheme */
:root {
  /* Primary Colors - Vibrant gem-like palette */
  --color-primary: #FF1493; /* Deep pink */
  --color-secondary: #00CED1; /* Dark turquoise */
  --color-accent: #FFD700; /* Gold */
  --color-purple: #9370DB; /* Medium purple */
  --color-orange: #FF6347; /* Tomato */
  --color-green: #32CD32; /* Lime green */
  
  /* Background & Text */
  --color-bg: #FEFEFE; /* Almost white */
  --color-bg-alt: #FFF5F7; /* Light pink tint */
  --color-text: #1A1A2E; /* Dark navy */
  --color-text-light: #4A4A5E; /* Medium gray */
  
  /* UI Elements */
  --color-border: #E8E8F0;
  --color-shadow: rgba(26, 26, 46, 0.1);
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  
  /* Border Radius - Geometric with soft corners */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 4px 16px var(--color-shadow);
  --shadow-lg: 0 8px 32px var(--color-shadow);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
}

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

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

a {
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ===================================
   1. Sticky Header (Mobile-First)
   =================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: rgba(254, 254, 254, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  padding: 0 env(safe-area-inset-right, 0) 0 env(safe-area-inset-left, 0);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-sm);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.header-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.header-name {
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.header-nav {
  display: none;
}

.header-cta {
  display: none;
}

.header-cta-mobile {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.header-cta-mobile:active {
  background-color: var(--color-bg-alt);
  transform: scale(0.95);
}

/* Desktop Header */
@media (min-width: 768px) {
  .header {
    height: 64px;
  }
  
  .header-icon {
    width: 40px;
    height: 40px;
  }
  
  .header-name {
    font-size: 18px;
  }
  
  .header-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
  }
  
  .nav-link {
    font-size: 15px;
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
  }
  
  .nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-alt);
  }
  
  .header-cta {
    display: block;
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    color: white;
    font-weight: var(--font-weight-bold);
    border-radius: var(--radius-md);
    font-size: 15px;
    transition: all var(--transition-normal);
  }
  
  .header-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(255, 20, 147, 0.3);
  }
  
  .header-cta-mobile {
    display: none;
  }
}

/* ===================================
   2. Hero Section
   =================================== */

.hero {
  padding: calc(56px + var(--spacing-xl)) var(--spacing-sm) var(--spacing-xl);
  background: linear-gradient(135deg, #FFF5F7 0%, #F0F8FF 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.hero-content {
  margin-bottom: var(--spacing-xl);
}

.hero-icon {
  width: 96px;
  height: 96px;
  margin: 0 auto var(--spacing-md);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

.hero-title {
  font-size: 32px;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 20px;
  font-weight: var(--font-weight-medium);
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
}

.hero-description {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

.download-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-width: 320px;
  margin: 0 auto;
}

.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-bold);
  min-height: 56px;
  transition: all var(--transition-normal);
}

.download-btn.google-play {
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  color: white;
  box-shadow: var(--shadow-md);
}

.download-btn.google-play:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(255, 20, 147, 0.35);
}

.download-btn.google-play:active {
  transform: translateY(-1px);
}

.download-btn.app-store {
  position: relative;
  background: #2a2a2a;
  color: rgba(255, 255, 255, 0.7);
  opacity: 0.55;
  filter: grayscale(0.6);
  cursor: not-allowed;
  box-shadow: none;
}

.download-btn.app-store:hover {
  transform: none;
  box-shadow: none;
}

.store-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.store-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.store-label {
  font-size: 11px;
  font-weight: var(--font-weight-normal);
  text-transform: uppercase;
  opacity: 0.9;
}

.store-name {
  font-size: 16px;
  font-weight: var(--font-weight-bold);
}

.coming-soon-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  background: var(--color-orange);
  color: white;
  font-size: 10px;
  font-weight: var(--font-weight-bold);
  padding: 3px 8px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-visual {
  margin-top: var(--spacing-lg);
}

.hero-banner {
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Desktop Hero */
@media (min-width: 768px) {
  .hero {
    padding: calc(64px + var(--spacing-2xl)) var(--spacing-md) var(--spacing-2xl);
  }
  
  .hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    text-align: left;
  }
  
  .hero-content {
    margin-bottom: 0;
  }
  
  .hero-icon {
    margin: 0 0 var(--spacing-md) 0;
  }
  
  .hero-title {
    font-size: 48px;
  }
  
  .hero-subtitle {
    font-size: 24px;
  }
  
  .hero-description {
    margin: 0 0 var(--spacing-lg) 0;
  }
  
  .download-buttons {
    flex-direction: row;
    max-width: none;
    margin: 0;
  }
  
  .hero-visual {
    margin-top: 0;
  }
  
  .hero-banner {
    max-width: 100%;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 56px;
  }
  
  .hero-subtitle {
    font-size: 28px;
  }
  
  .hero-description {
    font-size: 18px;
  }
}

/* ===================================
   3. Features Section
   =================================== */

.features {
  padding: var(--spacing-2xl) var(--spacing-sm);
  background-color: var(--color-bg);
}

.features-container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 32px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-text-light);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.feature-card {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

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

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

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

.feature-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-sm);
  display: block;
}

.feature-title {
  font-size: 20px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.feature-description {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-light);
}

/* Desktop Features */
@media (min-width: 768px) {
  .features {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  .section-title {
    font-size: 40px;
  }
  
  .section-subtitle {
    font-size: 20px;
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===================================
   4. Screenshots Section
   =================================== */

.screenshots {
  padding: var(--spacing-2xl) var(--spacing-sm);
  background: linear-gradient(135deg, #F0F8FF 0%, #FFF5F7 100%);
}

.screenshots-container {
  max-width: 1200px;
  margin: 0 auto;
}

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

.screenshot-card {
  background: white;
  padding: var(--spacing-sm);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.screenshot-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.screenshot-image {
  width: 100%;
  border-radius: var(--radius-md);
}

/* Desktop Screenshots */
@media (min-width: 768px) {
  .screenshots {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .screenshots-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===================================
   5. Download CTA Section
   =================================== */

.download-cta {
  padding: var(--spacing-2xl) var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 50%, var(--color-secondary) 100%);
  color: white;
  text-align: center;
}

.download-cta-container {
  max-width: 800px;
  margin: 0 auto;
}

.download-cta-title {
  font-size: 32px;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

.download-cta-subtitle {
  font-size: 18px;
  margin-bottom: var(--spacing-xl);
  opacity: 0.95;
}

.download-buttons-large {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-width: 320px;
  margin: 0 auto;
}

.download-btn-large {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px 28px;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-bold);
  min-height: 64px;
  transition: all var(--transition-normal);
}

.download-btn-large.google-play {
  background: white;
  color: var(--color-text);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.download-btn-large.google-play .store-icon {
  color: var(--color-primary);
}

.download-btn-large.google-play:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.download-btn-large.google-play:active {
  transform: translateY(-2px) scale(1.01);
}

.download-btn-large.app-store {
  position: relative;
  background: #2a2a2a;
  color: rgba(255, 255, 255, 0.7);
  opacity: 0.55;
  filter: grayscale(0.6);
  cursor: not-allowed;
  box-shadow: none;
}

.download-btn-large.app-store:hover {
  transform: none;
  box-shadow: none;
}

/* Desktop Download CTA */
@media (min-width: 768px) {
  .download-cta {
    padding: calc(var(--spacing-2xl) * 1.5) var(--spacing-md);
  }
  
  .download-cta-title {
    font-size: 48px;
  }
  
  .download-cta-subtitle {
    font-size: 22px;
  }
  
  .download-buttons-large {
    flex-direction: row;
    max-width: none;
    justify-content: center;
  }
}

/* ===================================
   6. Floating CTA (Mobile Only)
   =================================== */

.floating-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-sm);
  background: rgba(254, 254, 254, 0.98);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -4px 16px var(--color-shadow);
  z-index: 999;
  padding-bottom: calc(var(--spacing-sm) + env(safe-area-inset-bottom, 0));
  opacity: 0;
  transform: translateY(100%);
  transition: all var(--transition-normal);
}

.floating-cta.visible {
  opacity: 1;
  transform: translateY(0);
}

.floating-cta-button {
  display: block;
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  color: white;
  font-weight: var(--font-weight-bold);
  font-size: 16px;
  border-radius: var(--radius-md);
  text-align: center;
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.floating-cta-button:active {
  transform: scale(0.98);
}

@media (min-width: 768px) {
  .floating-cta {
    display: none;
  }
}

/* ===================================
   7. About Section
   =================================== */

.about {
  padding: var(--spacing-2xl) var(--spacing-sm);
  background-color: var(--color-bg);
}

.about-container {
  max-width: 800px;
  margin: 0 auto;
}

.about-text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.about-contact {
  font-size: 16px;
  color: var(--color-text-light);
  margin-top: var(--spacing-lg);
}

.contact-link {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.contact-link:hover {
  color: var(--color-purple);
}

/* Desktop About */
@media (min-width: 768px) {
  .about {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .about-text {
    font-size: 17px;
  }
}

/* ===================================
   8. Footer
   =================================== */

.footer {
  padding: var(--spacing-xl) var(--spacing-sm) calc(var(--spacing-xl) + env(safe-area-inset-bottom, 0));
  background: linear-gradient(135deg, #1A1A2E 0%, #2D2D4A 100%);
  color: white;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.footer-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
}

.footer-name {
  font-size: 18px;
  font-weight: var(--font-weight-bold);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.footer-link {
  font-size: 14px;
  opacity: 0.9;
  transition: opacity var(--transition-fast);
}

.footer-link:hover {
  opacity: 1;
  text-decoration: underline;
}

.footer-contact {
  font-size: 14px;
  opacity: 0.8;
  margin-bottom: var(--spacing-md);
}

.footer-contact .contact-link {
  color: white;
  opacity: 1;
}

.footer-copyright {
  font-size: 13px;
  opacity: 0.7;
}

/* Desktop Footer */
@media (min-width: 768px) {
  .footer {
    padding: calc(var(--spacing-xl) * 1.5) var(--spacing-md) calc(var(--spacing-xl) + env(safe-area-inset-bottom, 0));
  }
}

/* ===================================
   Accessibility & Touch Targets
   =================================== */

@media (hover: none) and (pointer: coarse) {
  /* Ensure all interactive elements are at least 44x44px on touch devices */
  .download-btn,
  .download-btn-large,
  .floating-cta-button,
  .header-cta-mobile {
    min-height: 44px;
    min-width: 44px;
  }
}

/* Focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* 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;
  }
}