/* ===== ROOT VARIABLES ===== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #ec4899;
  --success: #10b981;
  --facebook: #1877f2;
  --tiktok-cyan: #25f4ee;
  --tiktok-pink: #fe2c55;
  --dark: #0f172a;
  --dark-light: #1e293b;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-400: #94a3b8;
  --gray-600: #475569;
  --white: #ffffff;
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
}

/* ===== BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--dark);
  color: var(--dark);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== BRAND LOGO ===== */
.brand-logo {
  width: 80px;
  height: 80px;
  background: var(--gradient-primary);
  border-radius: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: white;
  box-shadow: 0 20px 40px rgba(99, 102, 241, 0.4);
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(5deg); }
}

/* ===== COPYRIGHT ===== */
.copyright-text {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.85rem;
  margin: 0;
}

/* ===== NAVBAR ===== */
.navbar-custom {
  background: var(--gradient-dark);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-brand {
  font-weight: 800;
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-brand .brand-icon {
  width: 45px;
  height: 45px;
  background: var(--gradient-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: white;
  box-shadow: var(--shadow);
}

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

.nav-link {
  color: rgba(255, 255, 255, 0.7) !important;
  font-weight: 500;
  padding: 0.6rem 1.2rem !important;
  border-radius: 10px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.nav-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
  border-radius: 10px;
  z-index: -1;
}

.nav-link:hover {
  color: white !important;
  transform: translateY(-2px);
}

.nav-link:hover::before {
  opacity: 0.2;
}

.nav-link i {
  font-size: 1.1rem;
}

/* ===== HERO SECTION ===== */
.hero-section {
  min-height: 100vh;
  background: var(--gradient-dark);
  position: relative;
  display: flex;
  align-items: center;
  padding: 2rem 0;
  overflow: hidden;
}

/* Animated background */
.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(139, 92, 246, 0.2) 0%, transparent 40%);
  animation: aurora 15s ease-in-out infinite;
}

@keyframes aurora {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(2%, 2%) rotate(1deg); }
  50% { transform: translate(-1%, 3%) rotate(-1deg); }
  75% { transform: translate(3%, -2%) rotate(2deg); }
}

/* Floating particles */
.particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 6px;
  height: 6px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: float 20s infinite;
}

.particle:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 20s; }
.particle:nth-child(2) { left: 20%; animation-delay: 2s; animation-duration: 25s; }
.particle:nth-child(3) { left: 30%; animation-delay: 4s; animation-duration: 18s; }
.particle:nth-child(4) { left: 40%; animation-delay: 6s; animation-duration: 22s; }
.particle:nth-child(5) { left: 50%; animation-delay: 8s; animation-duration: 24s; }
.particle:nth-child(6) { left: 60%; animation-delay: 10s; animation-duration: 19s; }
.particle:nth-child(7) { left: 70%; animation-delay: 12s; animation-duration: 21s; }
.particle:nth-child(8) { left: 80%; animation-delay: 14s; animation-duration: 23s; }
.particle:nth-child(9) { left: 90%; animation-delay: 16s; animation-duration: 17s; }

@keyframes float {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-100vh) scale(1); opacity: 0; }
}

/* Hero Card */
.hero-card {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 32px;
  padding: 3rem;
  position: relative;
  overflow: hidden;
  animation: cardFloat 6s ease-in-out infinite;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: 0.5s;
}

.hero-card:hover::before {
  left: 100%;
}

@keyframes cardFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Title Styling */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.3); }
  50% { box-shadow: 0 0 40px rgba(99, 102, 241, 0.5); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 0%, #a5b4fc 50%, #f0abfc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 2rem;
}

/* Input Styling */
.input-wrapper {
  position: relative;
  margin-bottom: 1.5rem;
}

.input-wrapper i {
  position: absolute;
  left: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  font-size: 1.3rem;
  transition: all 0.3s ease;
}

.input-custom {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 1.2rem 1.5rem 1.2rem 3.5rem;
  font-size: 1.1rem;
  color: white;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.input-custom::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.input-custom:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2), var(--shadow-glow);
}

.input-custom:focus + i,
.input-wrapper:focus-within i {
  color: var(--primary);
}

/* Buttons */
.btn-group-custom {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.btn-custom {
  flex: 1;
  padding: 1rem 2rem;
  border: none;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.btn-custom::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: 0.5s;
}

.btn-custom:hover::before {
  left: 100%;
}

.btn-convert {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
  padding: 1.2rem 2.5rem;
  font-size: 1.1rem;
}

.btn-convert:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.5);
}

.btn-convert i {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.btn-convert:hover i {
  transform: rotate(180deg);
}

.btn-facebook {
  background: linear-gradient(135deg, #1877f2 0%, #0d65d9 100%);
  color: white;
  box-shadow: 0 8px 30px rgba(24, 119, 242, 0.4);
}

.btn-facebook:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px rgba(24, 119, 242, 0.5);
}

.btn-tiktok {
  background: linear-gradient(135deg, #010101 0%, #1a1a1a 100%);
  color: white;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  position: relative;
}

.btn-tiktok::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(135deg, var(--tiktok-cyan), var(--tiktok-pink));
  border-radius: 16px;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn-tiktok:hover {
  transform: translateY(-3px) scale(1.02);
}

.btn-tiktok:hover::after {
  opacity: 1;
}

/* Result Box */
.result-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(5, 150, 105, 0.2) 100%);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 16px;
  padding: 1.5rem;
  animation: resultSlide 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes resultSlide {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.result-box .result-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  margin-right: 1rem;
  animation: checkPop 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55) 0.2s both;
}

@keyframes checkPop {
  from { transform: scale(0); }
  to { transform: scale(1); }
}

.result-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0.25rem;
}

.result-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--success);
  font-family: 'Fira Code', monospace;
  letter-spacing: 1px;
}

.copy-btn {
  background: rgba(16, 185, 129, 0.2);
  border: 2px solid var(--success);
  color: var(--success);
  padding: 0.7rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.copy-btn:hover {
  background: var(--success);
  color: white;
  transform: scale(1.05);
}

/* ===== FEATURES SECTION ===== */
.features-section {
  padding: 6rem 0;
  background: var(--white);
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--primary);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--gray-600);
  max-width: 500px;
  margin: 0 auto;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 24px;
  padding: 2.5rem;
  text-align: center;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  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: transform 0.4s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

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

.feature-icon {
  width: 90px;
  height: 90px;
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 2.5rem;
  position: relative;
  transition: all 0.4s ease;
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}

.feature-icon.facebook {
  background: linear-gradient(135deg, rgba(24, 119, 242, 0.1) 0%, rgba(24, 119, 242, 0.2) 100%);
  color: var(--facebook);
}

.feature-icon.tiktok {
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.05) 0%, rgba(0, 0, 0, 0.1) 100%);
  color: var(--dark);
}

.feature-icon.fast {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(245, 158, 11, 0.2) 100%);
  color: #f59e0b;
}

.feature-icon.secure {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.2) 100%);
  color: var(--success);
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.75rem;
}

.feature-desc {
  color: var(--gray-600);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== STATS SECTION ===== */
.stats-section {
  padding: 5rem 0;
  background: var(--gradient-dark);
  position: relative;
}

.stat-card {
  text-align: center;
  padding: 2rem;
}

.stat-number {
  font-size: 3.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: rgba(255, 255, 255, 0.6);
  font-size: 1rem;
  font-weight: 500;
}

/* ===== FOOTER ===== */
.footer-custom {
  background: var(--dark);
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  display: inline-block;
}

.footer-desc {
  color: rgba(255, 255, 255, 0.5);
  max-width: 300px;
  line-height: 1.7;
}

.footer-title {
  color: white;
  font-weight: 700;
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links a:hover {
  color: white;
  transform: translateX(5px);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  width: 45px;
  height: 45px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.2rem;
  transition: all 0.3s ease;
  text-decoration: none;
}

.social-link:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-3px);
  border-color: transparent;
}

.footer-bottom {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.9rem;
}

/* ===== LOADING ===== */
#loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loader {
  width: 60px;
  height: 60px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  border-top-color: var(--primary);
  animation: spin 1s linear infinite;
}

.loader-text {
  color: rgba(255, 255, 255, 0.6);
  margin-top: 1.5rem;
  font-size: 0.9rem;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-card {
    padding: 2rem;
    border-radius: 24px;
  }
  
  .btn-group-custom {
    flex-direction: column;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .stat-number {
    font-size: 2.5rem;
  }
}

/* ===== UTILITIES ===== */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-glow {
  text-shadow: 0 0 40px rgba(99, 102, 241, 0.5);
}

/* Focus styles */
.btn:focus, .form-control:focus {
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
}