/* ===== VARIABLES CSS ===== */
:root {
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --error-color: #dc3545;
  --info-color: #17a2b8;
  --light-color: #f8f9fa;
  --dark-color: #343a40;
  --white: #ffffff;
  --black: #000000;
  
  --primary-gradient: linear-gradient(135deg, #667eea, #764ba2);
  --bg-gradient: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  --gradient-light: linear-gradient(135deg, #f8f9fa, #e9ecef);
  --gradient-dark: linear-gradient(135deg, #343a40, #495057);
  
  --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
  
  --border-radius: 0.375rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  
  --font-family-sans-serif: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-family-sans-serif);
  line-height: 1.6;
  color: var(--dark-color);
  background-color: var(--white);
  scroll-behavior: smooth;
}

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

.bg-gradient-primary {
  background: var(--gradient-primary);
}

.glass-effect {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.floating-animation {
  animation: floating 3s ease-in-out infinite;
}

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

/* ===== NAVIGATION ===== */
.navbar {
  transition: var(--transition-base);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95) !important;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--dark-color) !important;
  transition: var(--transition-base);
}

.navbar-brand:hover {
  transform: scale(1.05);
}

.nav-link {
  font-weight: 500;
  color: var(--dark-color) !important;
  transition: var(--transition-base);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-color) !important;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: var(--transition-base);
  transform: translateX(-50%);
}

.nav-link:hover::after {
  width: 80%;
}

/* ===== BUTTONS ===== */
.btn {
  border-radius: var(--border-radius-lg);
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea, #764ba2);
  border: none;
  color: var(--white);
}

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

.btn-outline-primary {
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  background: transparent;
}

.btn-outline-primary:hover {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

/* ===== HERO SECTION ===== */
.hero-section {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
  padding-top: 80px;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: #6c757d;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.hero-features .feature-item {
  display: flex;
  align-items: center;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
  color: var(--dark-color);
}

.hero-actions {
  margin-top: 2rem;
}

/* ===== QR SHOWCASE ===== */
.hero-image {
  position: relative;
  height: 500px;
}

.qr-showcase {
  position: relative;
  width: 100%;
  height: 100%;
}

.floating-qr {
  position: absolute;
  background: var(--white);
  padding: 1rem;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-base);
}

.floating-qr:hover {
  transform: translateY(-10px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

.qr-1 {
  top: 10%;
  left: 10%;
  animation: floating 3s ease-in-out infinite;
}

.qr-2 {
  top: 30%;
  right: 15%;
  animation: floating 3s ease-in-out infinite 0.5s;
}

.qr-3 {
  bottom: 30%;
  left: 15%;
  animation: floating 3s ease-in-out infinite 1s;
}

.qr-4 {
  bottom: 10%;
  right: 20%;
  animation: floating 3s ease-in-out infinite 1.5s;
}

.qr-code {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--border-radius);
  position: relative;
  overflow: hidden;
}

.qr-code::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  background: var(--white);
  border-radius: 2px;
  transform: translate(-50%, -50%);
}

.qr-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--dark-color);
}

/* ===== SECTIONS ===== */
.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--dark-color);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.2rem;
  color: #6c757d;
  margin-bottom: 2rem;
}

/* ===== FEATURE CARDS ===== */
.feature-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition-base);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 2rem;
  color: var(--white);
}

.feature-card h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.feature-card p {
  color: #6c757d;
  line-height: 1.6;
}

/* ===== QR TYPE CARDS ===== */
.qr-type-card {
  background: var(--white);
  padding: 1.5rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition-base);
  border: 1px solid rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  height: 100px;
}

.qr-type-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--primary-color);
}

.qr-type-card i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.qr-type-card span {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dark-color);
}

/* ===== TESTIMONIALS ===== */
.testimonial-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow);
  transition: var(--transition-base);
  height: 100%;
}

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

.testimonial-card p {
  font-style: italic;
  margin-bottom: 1.5rem;
  color: var(--dark-color);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.testimonial-author img {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-author h6 {
  margin-bottom: 0.25rem;
  font-weight: 600;
  color: var(--dark-color);
}

/* ===== CTA SECTION ===== */
.cta-section {
  background: var(--gradient-primary);
  padding: 5rem 0;
  color: var(--white);
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
  line-height: 1.6;
}

.cta-actions .btn {
  margin: 0.5rem;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--dark-color);
  color: var(--white);
}

.footer-brand {
  margin-bottom: 2rem;
}

.footer-brand .navbar-brand {
  color: var(--white) !important;
}

.footer-title {
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--white);
}

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

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #adb5bd;
  text-decoration: none;
  transition: var(--transition-base);
}

.footer-links a:hover {
  color: var(--white);
  padding-left: 5px;
}

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

.social-links a:hover {
  background: var(--primary-color);
  color: var(--white) !important;
  transform: translateY(-2px);
}

/* ===== FORMS ===== */
.form-control {
  border: 2px solid #e9ecef;
  border-radius: var(--border-radius-lg);
  padding: 0.75rem 1rem;
  font-size: 1rem;
  transition: var(--transition-base);
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-label {
  font-weight: 600;
  color: var(--dark-color);
  margin-bottom: 0.5rem;
}

/* ===== CARDS ===== */
.card {
  border: none;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow);
  transition: var(--transition-base);
}

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

.card-header {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0 !important;
  padding: 1.5rem;
}

.card-body {
  padding: 2rem;
}

/* ===== ALERTS ===== */
.alert {
  border: none;
  border-radius: var(--border-radius-lg);
  padding: 1rem 1.5rem;
  margin-bottom: 1.5rem;
}

.alert-success {
  background: linear-gradient(135deg, #d4edda, #c3e6cb);
  color: #155724;
}

.alert-danger {
  background: linear-gradient(135deg, #f8d7da, #f5c6cb);
  color: #721c24;
}

.alert-warning {
  background: linear-gradient(135deg, #fff3cd, #ffeaa7);
  color: #856404;
}

.alert-info {
  background: linear-gradient(135deg, #d1ecf1, #bee5eb);
  color: #0c5460;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .section-subtitle {
    font-size: 1.1rem;
  }
  
  .hero-actions .btn {
    display: block;
    width: 100%;
    margin-bottom: 1rem;
  }
  
  .floating-qr {
    position: relative;
    display: inline-flex;
    margin: 1rem;
  }
  
  .qr-showcase {
    text-align: center;
    height: auto;
  }
  
  .cta-title {
    font-size: 2rem;
  }
  
  .cta-subtitle {
    font-size: 1.1rem;
  }
  
  .cta-actions .btn {
    display: block;
    width: 100%;
    margin-bottom: 1rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .feature-card,
  .testimonial-card {
    padding: 1.5rem;
  }
  
  .btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
  }
}

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

@keyframes fadeInDown {
  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-fadeInUp {
  animation: fadeInUp 0.6s ease-out;
}

.animate-fadeInDown {
  animation: fadeInDown 0.6s ease-out;
}

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

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

/* ===== LOADING STATES ===== */
.loading {
  position: relative;
  color: transparent !important;
}

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

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: var(--gradient-primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}