/* ===== CSS Variables ===== */
:root {
  /* Colors */
  --primary-color: #FF6B9D;
  --primary-light: #FFB3D1;
  --primary-dark: #E55A8A;
  --secondary-color: #9B59B6;
  --secondary-light: #C39BD3;
  --secondary-dark: #8E44AD;
  
  --accent-color: #FF8A80;
  --success-color: #4CAF50;
  --warning-color: #FF9800;
  --error-color: #F44336;
  
  --text-primary: #2C3E50;
  --text-secondary: #7F8C8D;
  --text-light: #BDC3C7;
  --text-white: #FFFFFF;
  
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --bg-tertiary: #ECF0F1;
  --bg-dark: #2C3E50;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary-light) 100%);
  --gradient-hero: linear-gradient(135deg, #FF6B9D 0%, #9B59B6 50%, #667eea 100%);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* 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-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

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

/* ===== Utility Classes ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.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;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 107, 157, 0.1);
  transition: var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

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

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

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -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-weight: 500;
  color: var(--text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-color);
  background-color: rgba(255, 107, 157, 0.1);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: var(--transition-fast);
  transform: translateX(-50%);
}

.nav-link:hover::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.bar {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  margin: 3px 0;
  transition: var(--transition-fast);
  border-radius: var(--radius-sm);
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding-top: 80px;
  padding-bottom: var(--spacing-lg);
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  width: 100%;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xxl);
  align-items: center;
  min-height: calc(100vh - 160px);
}

.hero-text {
  z-index: 2;
}

.hero-title {
  margin-bottom: var(--spacing-lg);
}

.title-main {
  display: block;
  font-size: var(--font-size-5xl);
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: var(--spacing-xs);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.title-sub {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.hero-description {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--font-size-base);
  transition: var(--transition-normal);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--text-white);
  color: var(--primary-color);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: var(--text-white);
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
}

.btn-icon {
  font-size: var(--font-size-lg);
}

.hero-download-btn {
  min-width: 280px;
  padding: var(--spacing-lg) var(--spacing-xxl);
  font-size: var(--font-size-xl);
  font-weight: 700;
  justify-content: center;
  text-align: center;
}

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

.phone-mockup {
  position: relative;
  z-index: 2;
}

.phone-img {
  max-width: 400px;
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.2));
}

.floating-elements {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
}

.floating-heart,
.floating-star,
.floating-message {
  position: absolute;
  font-size: var(--font-size-2xl);
  animation: float 3s ease-in-out infinite;
}

.floating-heart {
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.floating-star {
  top: 60%;
  right: 15%;
  animation-delay: 1s;
}

.floating-message {
  bottom: 30%;
  left: 20%;
  animation-delay: 2s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.hero-bg-elements {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  z-index: 1;
}

.bg-circle {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  animation: pulse 4s ease-in-out infinite;
}

.bg-circle-1 {
  width: 200px;
  height: 200px;
  top: 10%;
  right: 10%;
  animation-delay: 0s;
}

.bg-circle-2 {
  width: 150px;
  height: 150px;
  bottom: 20%;
  left: 5%;
  animation-delay: 1s;
}

.bg-circle-3 {
  width: 100px;
  height: 100px;
  top: 50%;
  left: 80%;
  animation-delay: 2s;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.3;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.1;
  }
}

/* ===== Features Section ===== */
.features {
  padding: var(--spacing-xxl) 0;
  background: var(--bg-secondary);
}

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

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  margin-bottom: var(--spacing-lg);
}

.icon-wrapper {
  width: 80px;
  height: 80px;
  margin: 0 auto;
  background: var(--gradient-secondary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

.icon {
  font-size: var(--font-size-3xl);
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Download Section ===== */
.download {
  padding: var(--spacing-xxl) 0;
  background: var(--gradient-primary);
  color: var(--text-white);
}

.download-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-xxl);
  align-items: center;
}

.download-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.download-description {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
}

.download-buttons {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

.download-main-btn {
  font-size: var(--font-size-lg);
  padding: var(--spacing-lg) var(--spacing-xxl);
  background: var(--text-white);
  color: var(--primary-color);
  box-shadow: var(--shadow-xl);
  border-radius: var(--radius-full);
  font-weight: 700;
  transition: var(--transition-normal);
  text-transform: none;
  min-width: 200px;
}

.download-main-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  background: rgba(255, 255, 255, 0.95);
}

.download-main-btn .btn-icon {
  font-size: var(--font-size-xl);
  margin-left: var(--spacing-xs);
}

.download-qr {
  display: flex;
  justify-content: center;
  align-items: center;
}

.qr-code {
  text-align: center;
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

.qr-img {
  width: 200px;
  height: 200px;
  margin-bottom: var(--spacing-md);
}

.qr-text {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark);
  color: var(--text-white);
  padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

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

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.footer-logo-img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
}

.footer-logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-description {
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

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

.social-link {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.social-link:hover {
  background: var(--primary-color);
  transform: translateY(-2px);
}

.social-icon {
  font-size: var(--font-size-lg);
}

.footer-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-white);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  color: var(--text-light);
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--primary-color);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
}

.copyright {
  color: var(--text-light);
  font-size: var(--font-size-sm);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    text-align: center;
    min-height: calc(100vh - 120px);
  }
  
  .hero-image {
    order: -1;
  }
  
  .phone-img {
    max-width: 300px;
  }
  
  .download-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-primary);
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding-top: var(--spacing-xl);
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  .hero {
    min-height: 100vh;
    padding-top: 70px;
    padding-bottom: var(--spacing-md);
  }
  
  .hero-content {
    min-height: calc(100vh - 100px);
    gap: var(--spacing-lg);
  }
  
  .title-main {
    font-size: var(--font-size-4xl);
  }
  
  .title-sub {
    font-size: var(--font-size-lg);
  }
  
  .hero-description {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-lg);
  }
  
  .hero-buttons {
    justify-content: center;
    gap: var(--spacing-sm);
  }
  
  .phone-img {
    max-width: 250px;
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .download-title {
    font-size: var(--font-size-3xl);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .social-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero {
    min-height: 100vh;
    padding-top: 60px;
    padding-bottom: var(--spacing-sm);
  }
  
  .hero-container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero-content {
    min-height: calc(100vh - 80px);
    gap: var(--spacing-md);
  }
  
  .title-main {
    font-size: var(--font-size-3xl);
  }
  
  .title-sub {
    font-size: var(--font-size-base);
  }
  
  .hero-description {
    font-size: var(--font-size-sm);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
  }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
  }
  
  .phone-img {
    max-width: 200px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .feature-card {
    padding: var(--spacing-lg);
  }
  
  .download-main-btn {
    min-width: 180px;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
  }
}

@media (max-width: 360px) {
  .hero-container {
    padding: 0 var(--spacing-xs);
  }
  
  .title-main {
    font-size: var(--font-size-2xl);
  }
  
  .title-sub {
    font-size: var(--font-size-sm);
  }
  
  .hero-description {
    font-size: var(--font-size-xs);
  }
  
  .phone-img {
    max-width: 180px;
  }
  
  .btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
  }
  
  .download-main-btn {
    min-width: 160px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
}

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

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in-left {
  animation: fadeInLeft 0.6s ease-out;
}

.animate-fade-in-right {
  animation: fadeInRight 0.6s ease-out;
}

/* ===== Scroll Animations ===== */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: var(--transition-slow);
}

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

/* ===== Loading States ===== */
.loading {
  opacity: 0.7;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--primary-color);
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}