/* ========================================
   HiVi - Android Video Downloader Website
   Design System & Styles
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* === CSS Variables === */
:root {
  --color-bg: #0a0a1a;
  --color-bg-secondary: #111128;
  --color-surface: rgba(255, 255, 255, 0.04);
  --color-surface-hover: rgba(255, 255, 255, 0.08);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #f0f0f5;
  --color-text-secondary: #9ca3af;
  --color-text-muted: #6b7280;
  --color-primary: #7C3AED;
  --color-primary-light: #a78bfa;
  --color-secondary: #2563EB;
  --color-accent: #06b6d4;
  --gradient-primary: linear-gradient(135deg, #7C3AED, #2563EB);
  --gradient-hero: linear-gradient(135deg, #0a0a1a 0%, #1a1040 40%, #0d1a3a 70%, #0a0a1a 100%);
  --gradient-card: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(37, 99, 235, 0.1));
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(124, 58, 237, 0.3);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* === Background Decorations === */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.bg-orb-1 {
  width: 600px;
  height: 600px;
  background: var(--color-primary);
  top: -200px;
  right: -200px;
  animation: float-orb 20s ease-in-out infinite;
}

.bg-orb-2 {
  width: 500px;
  height: 500px;
  background: var(--color-secondary);
  bottom: -100px;
  left: -200px;
  animation: float-orb 25s ease-in-out infinite reverse;
}

.bg-orb-3 {
  width: 400px;
  height: 400px;
  background: var(--color-accent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: float-orb 30s ease-in-out infinite;
}

@keyframes float-orb {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  25% {
    transform: translate(30px, -30px) scale(1.05);
  }

  50% {
    transform: translate(-20px, 20px) scale(0.95);
  }

  75% {
    transform: translate(20px, 10px) scale(1.02);
  }
}

/* === Container === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* === Navigation === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: background var(--transition-normal), backdrop-filter var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text);
}

.nav-brand img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.nav-brand span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-normal);
}

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

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

.nav-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--gradient-primary);
  color: #fff !important;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-download-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  color: #fff !important;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* === Hero Section === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(124, 58, 237, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 30%, rgba(37, 99, 235, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--color-primary-light);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero h1 .highlight {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 500px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(124, 58, 237, 0.4);
  color: #fff;
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--color-text);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  transform: translateY(-3px);
  color: var(--color-text);
}

.btn-icon {
  font-size: 1.3rem;
}

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

.phone-mockup {
  width: 280px;
  height: 560px;
  background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
  border-radius: 40px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-lg), 0 0 80px rgba(124, 58, 237, 0.15);
  overflow: hidden;
  position: relative;
  animation: float-phone 6s ease-in-out infinite;
}

@keyframes float-phone {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-15px);
  }
}

.phone-notch {
  width: 120px;
  height: 28px;
  background: #0a0a1a;
  border-radius: 0 0 16px 16px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.phone-screen {
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.phone-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.phone-header .app-icon-small {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.phone-header .app-name {
  font-weight: 700;
  font-size: 1.1rem;
}

.phone-search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.phone-card {
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.phone-card-thumbnail {
  width: 100%;
  height: 120px;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.3), rgba(37, 99, 235, 0.3));
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.phone-card-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.phone-card-title {
  font-size: 0.8rem;
  font-weight: 600;
}

.phone-card-badge {
  font-size: 0.65rem;
  padding: 3px 8px;
  background: rgba(16, 185, 129, 0.2);
  color: #10b981;
  border-radius: var(--radius-full);
}

.phone-download-bar {
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  margin-top: 4px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 48px;
}

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

.stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* === Section Styles === */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* === Features Section === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(124, 58, 237, 0.3);
  box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  background: var(--gradient-card);
  border: 1px solid var(--glass-border);
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

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



/* === How It Works Section === */
.steps-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.steps-container::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 16.67%;
  right: 16.67%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent));
  opacity: 0.3;
}

.step-card {
  text-align: center;
  position: relative;
}

.step-number {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 auto 24px;
  box-shadow: 0 0 30px rgba(124, 58, 237, 0.3);
  position: relative;
  z-index: 1;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 280px;
  margin: 0 auto;
}

/* === Download CTA Section === */
.download-cta {
  background: var(--color-bg-secondary);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.download-cta::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  backdrop-filter: blur(20px);
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.cta-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  line-height: 1.6;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-google-play {
  background: #000;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 12px 28px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  transition: all var(--transition-normal);
}

.btn-google-play:hover {
  background: #222;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  color: #fff;
}

.btn-google-play .play-icon {
  font-size: 1.6rem;
}

.btn-google-play .play-text {
  text-align: left;
  line-height: 1.2;
}

.btn-google-play .play-text small {
  display: block;
  font-size: 0.7rem;
  font-weight: 400;
  opacity: 0.7;
}

.btn-google-play .play-text span {
  display: block;
  font-weight: 700;
}

/* === Footer === */
.footer {
  padding: 60px 0 30px;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand .nav-brand {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-section h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

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

/* === Animations === */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.reveal-delay-1 {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

.reveal-delay-3 {
  transition-delay: 0.3s;
}

.reveal-delay-4 {
  transition-delay: 0.4s;
}

.reveal-delay-5 {
  transition-delay: 0.5s;
}

.reveal-delay-6 {
  transition-delay: 0.6s;
}

/* === Responsive === */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero h1 {
    font-size: 2.8rem;
  }

  .hero-description {
    margin: 0 auto 36px;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

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

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

  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 26, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 40px;
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .phone-mockup {
    width: 220px;
    height: 440px;
    border-radius: 30px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 2rem;
  }

  .features-grid,
  .steps-container {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .steps-container::before {
    display: none;
  }

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

  .hero-stats {
    flex-direction: column;
    gap: 16px;
    align-items: center;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .cta-card {
    padding: 40px 24px;
  }

  .cta-title {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .platforms-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .platform-card {
    padding: 20px 14px;
  }
}