/* ===================================== */
/* XUÂN PHẠM MAKEUP - ULTRA MODERN UI  */
/* Revolutionary Lightweight Design     */
/* ===================================== */

/* Optimized CSS Variables */
:root {
  --primary: #e91e63;
  --primary-light: #f8bbd0; 
  --primary-dark: #c2185b;
  --accent: #f06292;
  --accent-light: #fce4ec;
  --gold: #d4a574;
  --success: #4CAF50;
  --warning: #ff4081;
  
  /* Neutral Colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Typography */
  --font-display: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  
  /* Shadows - Optimized */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Modern Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  line-height: 1.6;
  color: var(--gray-700);
  background: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container { padding: 0 var(--space-6); }
}

@media (min-width: 1024px) {
  .container { padding: 0 var(--space-8); }
}

/* ===================================== */
/* MODERN HEADER                        */
/* ===================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  transition: var(--transition);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.logo-container img {
  height: 2.5rem;
  width: auto;
  transition: var(--transition);
}

.logo-container:hover img {
  transform: scale(1.05);
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: var(--primary-light);
  background: color-mix(in srgb, var(--primary) 10%, transparent);
}

.nav-links a.cta-button {
  background: var(--primary);
  color: white;
  font-weight: 600;
}

.nav-links a.cta-button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.mobile-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  background: var(--gray-100);
  border-radius: var(--radius-md);
  color: var(--gray-600);
  cursor: pointer;
  transition: var(--transition);
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.mobile-menu-toggle:hover {
  background: var(--gray-200);
  color: var(--gray-800);
}

/* Breadcrumb */
.breadcrumb-nav {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  padding: var(--space-3) 0;
  margin-top: 4rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb a {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.breadcrumb a:hover {
  color: var(--primary-dark);
}

.breadcrumb-separator {
  color: var(--gray-400);
}

/* ===================================== */
/* HERO SECTION - ULTRA MODERN         */
/* ===================================== */

.hero-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  padding: var(--space-20) 0 var(--space-16);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(255,255,255,0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 0%, transparent 50%);
}

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

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, white 0%, rgba(255,255,255,0.8) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.6;
  opacity: 0.9;
  max-width: 800px;
  margin: 0 auto;
}

/* ===================================== */
/* MODERN SECTIONS                      */
/* ===================================== */

.section {
  padding: var(--space-16) 0;
}

.section:nth-child(even) {
  background: white;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-description {
  font-size: 1.125rem;
  color: var(--gray-600);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===================================== */
/* ULTRA MODERN PRICE CARDS            */
/* ===================================== */

.price-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-16);
  padding-top: var(--space-4);
}

@media (min-width: 640px) {
  .price-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.price-card {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  transition: var(--transition-slow);
  position: relative;
  overflow: visible;
  margin-top: var(--space-4);
}

.price-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms ease;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  z-index: 1;
}

.price-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-light);
}

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

.price-card.featured {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  transform: scale(1.05);
  border: none;
}

.price-card.featured::before {
  background: rgba(255,255,255,0.2);
  transform: scaleX(1);
}

.price-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
}

.service-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--gray-900);
  position: relative;
  z-index: 2;
}

.price-card.featured .service-name {
  color: white;
}

.service-price {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-4);
  position: relative;
  z-index: 2;
}

.price-card.featured .service-price {
  color: white;
}

.service-description {
  color: var(--gray-600);
  margin-bottom: var(--space-6);
  line-height: 1.6;
  position: relative;
  z-index: 2;
}

.price-card.featured .service-description {
  color: rgba(255,255,255,0.9);
}

.service-features {
  list-style: none;
  space-y: var(--space-3);
  position: relative;
  z-index: 2;
}

.service-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  font-size: 0.875rem;
  line-height: 1.5;
}

.service-features li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.price-card.featured .service-features li::before {
  color: rgba(255,255,255,0.8);
}

.service-features li.negative::before {
  content: '✗';
  color: var(--warning);
}

.service-features li.negative {
  opacity: 0.7;
}

/* Popular Badge */
.popular-badge {
  position: absolute;
  top: -8px;
  right: 16px;
  background: var(--gold);
  color: white;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-md);
  z-index: 10;
}

/* ===================================== */
/* COURSE DETAILS - MODERN LAYOUT      */
/* ===================================== */

.course-details {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-200);
}

.course-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.course-info-item {
  text-align: center;
  padding: var(--space-6);
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
}

.course-info-item h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
}

.course-info-item p {
  color: var(--primary);
  font-weight: 600;
}

.course-info-item small {
  display: block;
  color: var(--gray-500);
  font-size: 0.875rem;
  margin-top: var(--space-1);
}

.course-session {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
  border-left: 4px solid var(--primary);
  transition: var(--transition);
}

.course-session:hover {
  background: white;
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.session-title {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--space-3);
  font-size: 1.125rem;
}

.session-content {
  color: var(--gray-600);
  line-height: 1.6;
}

/* ===================================== */
/* SPECIAL OFFERS & BENEFITS           */
/* ===================================== */

.special-offer {
  background: linear-gradient(135deg, var(--gold) 0%, #f97316 100%);
  color: white;
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  margin: var(--space-10) 0;
  position: relative;
  overflow: hidden;
}

.special-offer::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% { transform: translateX(0) rotate(0deg); }
  50% { transform: translateX(10px) rotate(5deg); }
}

.special-offer-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.special-offer p {
  line-height: 1.6;
  opacity: 0.95;
}

.why-choose-us {
  background: var(--gray-50);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  margin: var(--space-10) 0;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.benefit-item {
  background: white;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

.benefit-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--primary-light);
}

.benefit-item h5 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
}

.benefit-item p {
  color: var(--gray-600);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* ===================================== */
/* CONTACT SECTION - MODERN CTAs       */
/* ===================================== */

.contact-section {
  background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
  color: var(--gray-800);
  padding: var(--space-20) 0;
  text-align: center;
  border-top: 1px solid var(--gray-200);
}

.contact-highlight {
  max-width: 600px;
  margin: 0 auto;
}

.contact-highlight h2 {
  font-family: var(--font-display);
  margin-bottom: var(--space-4);
}

.contact-highlight p {
  margin-bottom: var(--space-6);
  opacity: 0.9;
}

.hotline {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin: var(--space-4) 0 var(--space-8);
}

.contact-buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background: var(--primary);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

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

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

.contact-btn.secondary:hover {
  background: var(--primary);
  color: white;
}

/* ===================================== */
/* RESPONSIVE DESIGN                    */
/* ===================================== */

@media (max-width: 767px) {
  /* Mobile Menu Toggle - FIXED */
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    gap: 0;
    padding: var(--space-4) 0;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    z-index: 40;
  }
  
  .nav-links.open {
    display: flex;
  }
  
  .nav-links a {
    padding: var(--space-4) var(--space-6);
    border-radius: 0;
    border-bottom: 1px solid var(--gray-100);
    justify-content: flex-start;
    font-size: 1rem;
  }
  
  .nav-links a:last-child {
    border-bottom: none;
  }
  
  .nav-links a.cta-button {
    margin: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    border-bottom: none;
  }
  
  .mobile-menu-toggle.active {
    background: var(--primary-light);
    color: var(--primary);
  }

  .hero-section {
    padding: var(--space-16) 0 var(--space-12);
  }
  
  .section {
    padding: var(--space-12) 0;
  }
  
  .section-header {
    margin-bottom: var(--space-12);
  }
  
  .price-card {
    padding: var(--space-6);
  }
  
  .course-details {
    padding: var(--space-6);
  }
  
  .contact-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .contact-btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}

/* ===================================== */
/* PERFORMANCE OPTIMIZATIONS           */
/* ===================================== */

/* Reduce layout shifts */
img {
  height: auto;
  max-width: 100%;
}

/* GPU acceleration for smooth animations */
.price-card,
.benefit-item,
.course-session,
.contact-btn {
  will-change: transform;
}

/* Optimize for 60fps */
@media (prefers-reduced-motion: no-preference) {
  .price-card:hover,
  .benefit-item:hover,
  .course-session:hover,
  .contact-btn:hover {
    transform: translateY(-8px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Critical CSS loaded inline, rest lazy-loaded */
.lazy-load {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
}

.lazy-load.loaded {
  opacity: 1;
  transform: translateY(0);
}

/* Print styles */
@media print {
  .site-header,
  .contact-section,
  .special-offer {
    display: none !important;
  }
  
  .price-card {
    break-inside: avoid;
    margin-bottom: var(--space-4);
  }
}