/* 
   CÔNG TY TNHH TRUYỀN THÔNG VÀ THƯƠNG MẠI BẢO SƠN
   DỊCH VỤ EMAIL DOANH NGHIỆP GOOGLE WORKSPACE & MICROSOFT 365
   Premium Enterprise CSS Stylesheet
*/

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

/* --- CUSTOM PROPERTIES --- */
:root {
  /* Harmonious Color Palette */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  --text-white: #ffffff;
  
  --primary: #0f52ba;
  --primary-hover: #0a3d91;
  --primary-light: #eff6ff;
  
  --google-blue: #4285F4;
  --google-red: #EA4335;
  --google-yellow: #FBBC05;
  --google-green: #34A853;
  --google-blue-soft: #e8f0fe;
  
  --microsoft-blue: #0078D4;
  --microsoft-blue-soft: #ebf3fc;
  
  --border-color: #e2e8f0;
  --border-focus: #94a3b8;
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  /* Gradients */
  --gradient-premium: linear-gradient(135deg, #0f52ba 0%, #1e40af 50%, #1d4ed8 100%);
  --gradient-cloud: linear-gradient(135deg, #f0f7ff 0%, #e0f2fe 100%);
  --gradient-google: linear-gradient(135deg, #4285F4 0%, #357ae8 100%);
  --gradient-microsoft: linear-gradient(135deg, #0078D4 0%, #005a9e 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.4) 100%);
  --gradient-cta: linear-gradient(135deg, #1e3a8a 0%, #0f52ba 100%);
  --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #3b82f6 100%);
  
  /* Typography */
  --font-heading: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.12), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
  --shadow-premium: 0 25px 50px -12px rgba(15, 82, 186, 0.15);
  
  /* Layout */
  --max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  /* Animation speeds */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- RESET & GLOBAL STYLES --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-body);
  color: var(--text-main);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
}

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

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

/* --- REUSABLE UTILITIES & LAYOUT --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding-top: 6rem;
  padding-bottom: 6rem;
  position: relative;
}

.section-bg-gray {
  background-color: var(--bg-secondary);
}

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

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 4rem auto;
}

.section-badge {
  display: inline-block;
  padding: 0.375rem 1rem;
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 9999px;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.125rem;
}

/* --- BUTTONS --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-normal);
  gap: 0.5rem;
}

.btn-primary {
  background: var(--gradient-premium);
  color: var(--text-white);
  box-shadow: 0 4px 14px rgba(15, 82, 186, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(15, 82, 186, 0.6);
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--primary);
  transform: translateY(-2px);
}

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

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: var(--bg-secondary);
}

.btn-outline-white {
  background: transparent;
  color: var(--text-white);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-white);
  transform: translateY(-2px);
}

.btn-google {
  background: var(--gradient-google);
  color: var(--text-white);
}
.btn-google:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(66, 133, 244, 0.4);
}

.btn-microsoft {
  background: var(--gradient-microsoft);
  color: var(--text-white);
}
.btn-microsoft:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 120, 212, 0.4);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

/* --- GLASS CARD --- */
.glass-card {
  background: var(--gradient-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

/* --- HEADER & NAVIGATION --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: var(--transition-normal);
  border-bottom: 1px solid transparent;
}

.header-scrolled {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  font-family: var(--font-heading);
}

.logo img {
  height: 2.25rem;
  width: auto;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo-main {
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.logo-sub {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-top: 0.15rem;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: var(--transition-fast);
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--text-main);
  cursor: pointer;
}

/* --- MOBILE DRAWER NAVIGATION --- */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -300px;
  width: 300px;
  height: 100vh;
  background-color: var(--bg-primary);
  z-index: 1001;
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  transition: var(--transition-slow);
}

.mobile-nav.active {
  right: 0;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.mobile-nav-close {
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

.mobile-nav-menu {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mobile-nav-link {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

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

.mobile-nav-actions {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.backdrop.active {
  opacity: 1;
  visibility: visible;
}

/* --- SECTION 1: HERO SECTION --- */
.hero {
  padding-top: 9rem;
  padding-bottom: 7rem;
  background: radial-gradient(circle at top right, rgba(239, 246, 255, 0.8) 0%, rgba(255, 255, 255, 1) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(15, 82, 186, 0.05) 0%, transparent 70%);
  top: -200px;
  right: -200px;
  z-index: 0;
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 4rem;
  position: relative;
  z-index: 1;
}

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--primary-light);
  color: var(--primary);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.hero-tagline svg {
  color: var(--success);
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.5rem;
}

.hero-title span {
  display: block;
  background: var(--gradient-premium);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  max-width: 580px;
}

.hero-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

.hero-trust-item svg {
  color: var(--success);
  flex-shrink: 0;
}

.hero-mockup-wrapper {
  position: relative;
}

.hero-mockup-bg {
  position: absolute;
  width: 120%;
  height: 120%;
  background: radial-gradient(circle, rgba(15, 82, 186, 0.1) 0%, transparent 60%);
  top: -10%;
  left: -10%;
  z-index: 0;
  pointer-events: none;
}

.hero-mockup {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-premium);
  background-color: var(--bg-primary);
  border: 4px solid var(--text-main);
  overflow: hidden;
  transition: transform 0.5s ease;
}

.hero-mockup:hover {
  transform: translateY(-5px) rotate(1deg);
}

.hero-slider-container {
  position: relative;
}

.hero-slider {
  display: flex;
  width: 100%;
  height: 100%;
  position: relative;
}

.hero-slide {
  min-width: 100%;
  position: relative;
  display: none;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}

.hero-slide.active {
  display: block;
  opacity: 1;
}

.hero-slide img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.slide-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(15, 23, 42, 0.75);
  color: var(--text-white);
  padding: 0.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  z-index: 5;
}

/* Slider Controls */
.hero-slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  z-index: 10;
  transition: var(--transition-normal);
}

.hero-slider-btn:hover {
  background: var(--bg-primary);
  color: var(--primary);
  transform: translateY(-50%) scale(1.1);
}

.hero-slider-btn.prev {
  left: 1rem;
}

.hero-slider-btn.next {
  right: 1rem;
}

.hero-slider-dots {
  position: absolute;
  bottom: 3.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.5rem;
  z-index: 10;
}

.hero-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: var(--transition-normal);
}

.hero-dot.active {
  width: 1.5rem;
  border-radius: 9999px;
  background: var(--text-white);
  box-shadow: var(--shadow-sm);
}

.hero-floating-badge {
  position: absolute;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 2;
  transition: var(--transition-normal);
}

.hero-floating-badge:hover {
  transform: scale(1.05);
}

.badge-google {
  bottom: 10%;
  left: -5%;
}

.badge-microsoft {
  top: 10%;
  right: -5%;
}

.badge-logo {
  width: 1.75rem;
  height: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.badge-text {
  font-size: 0.8rem;
  line-height: 1.2;
}

.badge-text strong {
  display: block;
  font-size: 0.9rem;
  color: var(--text-main);
}

/* --- SECTION 2: WHY CHOOSE EMAIL RIÊNG --- */
.pain-benefit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: stretch;
}

.pain-column, .benefit-column {
  border-radius: var(--radius-lg);
  padding: 3rem;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.pain-column {
  background-color: #fff5f5;
  border: 1px solid #fee2e2;
}

.benefit-column {
  background-color: #f0fdf4;
  border: 1px solid #dcfce7;
  box-shadow: var(--shadow-lg);
}

.column-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.pain-column .column-title {
  color: #b91c1c;
}

.benefit-column .column-title {
  color: #15803d;
}

.cards-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card-item {
  display: flex;
  gap: 1rem;
  background-color: var(--bg-primary);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.card-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.pain-column .card-icon {
  background-color: #fee2e2;
  color: #ef4444;
}

.benefit-column .card-icon {
  background-color: #dcfce7;
  color: #22c55e;
}

.card-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.card-content p {
  font-size: 0.925rem;
  color: var(--text-muted);
}

/* --- SECTION 3: COMPARE GOOGLE VS MICROSOFT --- */
.compare-container {
  max-width: 1000px;
  margin: 0 auto;
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.compare-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.compare-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
}

.compare-card.google-card::before {
  background: var(--gradient-google);
}

.compare-card.microsoft-card::before {
  background: var(--gradient-microsoft);
}

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

.compare-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.brand-icon-wrapper {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
}

.compare-card.google-card .brand-icon-wrapper {
  background-color: var(--google-blue-soft);
}

.compare-card.microsoft-card .brand-icon-wrapper {
  background-color: var(--microsoft-blue-soft);
}

.compare-brand h3 {
  font-size: 1.5rem;
  font-weight: 800;
}

.compare-features {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.compare-feat-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--bg-tertiary);
  font-size: 1rem;
}

.compare-feat-item:last-child {
  border-bottom: none;
}

.compare-feat-item span {
  font-weight: 500;
}

.compare-feat-item strong {
  margin-left: auto;
  color: var(--text-muted);
  font-weight: 600;
}

.compare-target {
  background-color: var(--bg-secondary);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--primary);
}

.compare-cta-block {
  text-align: center;
  margin-top: 3rem;
}

.compare-cta-block p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

/* --- SECTION 4: PRICING --- */
.pricing-switcher-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 3.5rem;
}

.pricing-switcher {
  display: inline-flex;
  align-items: center;
  background-color: var(--bg-tertiary);
  padding: 0.25rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  position: relative;
}

.switch-btn {
  padding: 0.5rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 9999px;
  cursor: pointer;
  z-index: 1;
  transition: var(--transition-normal);
}

.switch-btn.active {
  background-color: var(--bg-primary);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.savings-badge {
  position: absolute;
  top: -24px;
  right: -24px;
  background-color: var(--danger);
  color: var(--text-white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transform: rotate(10deg);
  white-space: nowrap;
}

.pricing-vat-note {
  margin-top: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.pricing-grid-brand {
  margin-bottom: 4.5rem;
}

.pricing-brand-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border-color);
}

.pricing-brand-title.google-border {
  border-color: var(--google-blue);
}

.pricing-brand-title.microsoft-border {
  border-color: var(--microsoft-blue);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.pricing-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
}

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

.pricing-card.popular {
  border-color: var(--primary);
  box-shadow: var(--shadow-premium);
  background-color: #fafcfe;
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-premium);
  color: var(--text-white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.375rem 1.25rem;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 10px rgba(15, 82, 186, 0.3);
}

.pricing-header h4 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.pricing-price-block {
  margin: 1.5rem 0;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  margin-bottom: 0.35rem;
}

.price-amount {
  font-size: 2rem;
  font-weight: 800;
  font-family: var(--font-heading);
  color: var(--text-main);
  transition: var(--transition-normal);
}

.price-period {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-left: 0.25rem;
}

.price-renewal {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  background-color: var(--bg-tertiary);
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  border: 1px dashed var(--border-color);
  transition: opacity var(--transition-normal);
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
  margin-top: 1.5rem;
}

.pricing-feat-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.pricing-feat-item svg {
  color: var(--success);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.pricing-card .btn {
  width: 100%;
  margin-top: auto;
}

/* --- SECTION 5: WHY BẢO SƠN --- */
.usp-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 5rem;
}

.usp-card {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition-normal);
}

.usp-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.usp-icon {
  width: 3.25rem;
  height: 3.25rem;
  background-color: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.usp-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.usp-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.stats-bar {
  background: var(--gradient-cta);
  border-radius: var(--radius-lg);
  padding: 3rem;
  color: var(--text-white);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.stat-item:last-child {
  border-right: none;
}

.stat-number {
  font-size: 3.5rem;
  font-weight: 800;
  font-family: var(--font-heading);
  line-height: 1;
}

.stat-label {
  font-size: 1rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
}

/* --- SECTION 6: WORKFLOW --- */
.timeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  position: relative;
}

.timeline-step {
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  position: relative;
  transition: var(--transition-normal);
}

.timeline-step:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.step-num {
  position: absolute;
  top: -24px;
  left: 2rem;
  width: 3.25rem;
  height: 3.25rem;
  background: var(--gradient-premium);
  color: var(--text-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  font-family: var(--font-heading);
  box-shadow: 0 4px 10px rgba(15, 82, 186, 0.3);
}

.timeline-step h4 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 0.5rem;
  margin-bottom: 0.75rem;
}

.timeline-step p {
  font-size: 0.925rem;
  color: var(--text-muted);
}

/* --- SECTION 7: TESTIMONIALS --- */
.testimonial-container {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.testimonial-slider {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.testimonial-slide {
  min-width: 100%;
  box-sizing: border-box;
  padding: 1.5rem;
}

.testimonial-card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 1.5rem;
  left: 2rem;
  font-size: 8rem;
  color: rgba(15, 82, 186, 0.08);
  font-family: serif;
  line-height: 1;
  pointer-events: none;
}

.testimonial-stars {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  color: var(--warning);
}

.testimonial-text {
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.6;
}

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

.client-avatar {
  width: 3.5rem;
  height: 3.5rem;
  background-color: var(--primary-light);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}

.client-info h5 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.client-info p {
  font-size: 0.85rem;
  color: var(--text-light);
}

.slider-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.slider-btn {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-normal);
}

.slider-btn:hover {
  background-color: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.slider-dots {
  display: flex;
  gap: 0.5rem;
}

.dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background-color: var(--border-focus);
  cursor: pointer;
  transition: var(--transition-normal);
}

.dot.active {
  width: 1.5rem;
  border-radius: 9999px;
  background-color: var(--primary);
}

.client-logos {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 2rem;
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-color);
  opacity: 0.6;
}

.client-logos img,
.client-logos svg {
  height: 2.25rem;
  width: auto;
  filter: grayscale(1);
  opacity: 0.55;
  transition: all var(--transition-normal);
}

.client-logos img:hover,
.client-logos svg:hover {
  filter: grayscale(0);
  opacity: 1;
}

/* --- SECTION 8: FAQ --- */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--bg-primary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: var(--transition-normal);
}

.faq-item:hover {
  border-color: var(--border-focus);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  user-select: none;
}

.faq-question h4 {
  font-size: 1.05rem;
  font-weight: 600;
  padding-right: 1.5rem;
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--text-light);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) cubic-bezier(0, 1, 0, 1);
}

.faq-answer-content {
  padding: 0 1.5rem 1.5rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  border-top: 1px solid transparent;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  transition: max-height var(--transition-normal) cubic-bezier(1, 0, 1, 0);
}

.faq-item.active .faq-answer-content {
  border-top-color: var(--bg-tertiary);
}

/* --- SECTION 9: FINAL CTA --- */
.final-cta {
  padding: 5rem 0;
  background: var(--gradient-cta);
  color: var(--text-white);
  position: relative;
  overflow: hidden;
}

.final-cta::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 60%);
  bottom: -200px;
  left: -200px;
  pointer-events: none;
}

.final-cta-content {
  text-align: center;
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.final-cta h2 {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 1rem;
}

.final-cta p {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 2.5rem;
}

.final-cta-btns {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.final-cta-btns .btn {
  min-width: 180px;
}

/* --- SECTION 10: FOOTER --- */
.footer {
  background-color: var(--text-main);
  color: rgba(255, 255, 255, 0.7);
  padding-top: 5rem;
  padding-bottom: 2rem;
  font-size: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-logo {
  color: var(--text-white);
}

.footer-logo .logo-main {
  color: var(--text-white);
}

.footer-about {
  line-height: 1.6;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.footer-contact-item svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.footer-contact-item a:hover {
  color: var(--text-white);
}

.footer-title {
  color: var(--text-white);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 2rem;
  height: 2px;
  background-color: var(--primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.footer-link a::before {
  content: '→';
  font-size: 0.8rem;
  opacity: 0;
  transform: translateX(-5px);
  transition: var(--transition-fast);
}

.footer-link a:hover {
  color: var(--text-white);
  padding-left: 0.25rem;
}

.footer-link a:hover::before {
  opacity: 1;
  transform: translateX(0);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
}

/* --- CONVERSION FORM & MODAL --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
  padding: 1.5rem;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 550px;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
  overflow: hidden;
  position: relative;
  transform: translateY(30px) scale(0.95);
  transition: var(--transition-slow);
}

.modal-overlay.active .modal-box {
  transform: translateY(0) scale(1);
}

.modal-header {
  background: var(--gradient-cta);
  color: var(--text-white);
  padding: 1.75rem 2rem;
  position: relative;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-white);
}

.modal-subtitle {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 0.25rem;
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-white);
}

.modal-body {
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-family: inherit;
  transition: var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1.25rem;
  padding-right: 2.5rem;
}

.form-submit-btn {
  width: 100%;
  margin-top: 1rem;
}

/* --- TOAST NOTIFICATIONS --- */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background-color: var(--text-main);
  color: var(--text-white);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.925rem;
  font-weight: 500;
  transform: translateY(20px);
  opacity: 0;
  animation: slideIn 0.3s forwards cubic-bezier(0.4, 0, 0.2, 1);
  border-left: 4px solid var(--success);
}

@keyframes slideIn {
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.toast svg {
  color: var(--success);
  flex-shrink: 0;
}

/* --- STICKY CTA BAR --- */
.sticky-cta-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.05);
  z-index: 990;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

.sticky-cta-bar.active {
  transform: translateY(0);
}

.sticky-info {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.sticky-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.sticky-title span {
  color: var(--primary);
}

.sticky-trust {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.sticky-trust-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.sticky-trust-item svg {
  color: var(--success);
  width: 1rem;
  height: 1rem;
}

.sticky-actions {
  display: flex;
  gap: 1rem;
}

/* --- FLOATING WIDGETS --- */
.floating-widgets {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  z-index: 998;
}

.floating-btn {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-white);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  position: relative;
  transition: var(--transition-normal);
}

.floating-btn:hover {
  transform: scale(1.1);
}

.floating-btn::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  top: 0;
  left: 0;
  z-index: -1;
  opacity: 0.4;
  animation: pulseRotate 2s infinite;
}

@keyframes pulseRotate {
  0% {
    transform: scale(1);
    opacity: 0.4;
  }
  100% {
    transform: scale(1.6);
    opacity: 0;
  }
}

.btn-zalo {
  background-color: #0084FF;
}

.btn-zalo::after {
  background-color: #0084FF;
}

.btn-phone {
  background-color: #10b981;
}

.btn-phone::after {
  background-color: #10b981;
}

.scroll-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background-color: var(--bg-primary);
  color: var(--text-main);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
  z-index: 998;
}

.scroll-top-btn.active {
  opacity: 1;
  visibility: visible;
}

.scroll-top-btn:hover {
  background-color: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-3px);
}

/* --- RESPONSIVE MEDIA QUERIES --- */

/* Desktop & Laptop Big Screen */
@media (max-width: 1200px) {
  :root {
    --max-width: 960px;
  }
  
  .hero-title {
    font-size: 2.75rem;
  }
  
  .usp-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .timeline {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .timeline-step {
    padding-left: 4.5rem;
  }
  
  .step-num {
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
  }
}

/* Tablet (Portrait & Landscape) */
@media (max-width: 992px) {
  :root {
    --max-width: 720px;
  }
  
  .section {
    padding-top: 4.5rem;
    padding-bottom: 4.5rem;
  }
  
  .navbar {
    height: 4rem;
  }
  
  .nav-menu, .nav-actions .btn-sm {
    display: none;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .hero .container {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-tagline {
    justify-content: center;
  }
  
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-btns {
    justify-content: center;
  }
  
  .hero-trust-grid {
    max-width: 500px;
    margin: 0 auto;
  }
  
  .hero-mockup-wrapper {
    max-width: 600px;
    margin: 0 auto;
  }
  
  .pain-benefit-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .compare-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 450px;
    margin: 0 auto;
    gap: 2.5rem;
  }
  
  .pricing-card.popular {
    transform: none;
  }
  
  .stats-bar {
    grid-template-columns: 1fr;
    padding: 2rem;
  }
  
  .stat-item {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    padding-bottom: 1.5rem;
  }
  
  .stat-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .sticky-cta-bar {
    display: none !important; /* Hide sticky bottom bar on mobile to avoid viewport clutter */
  }
}

/* Small Screens / Mobile */
@media (max-width: 576px) {
  :root {
    --max-width: 100%;
  }
  
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .hero-title {
    font-size: 2.15rem;
  }
  
  .hero-btns .btn {
    width: 100%;
  }
  
  .hero-trust-grid {
    grid-template-columns: 1fr;
  }
  
  .pain-column, .benefit-column {
    padding: 1.5rem;
  }
  
  .column-title {
    font-size: 1.25rem;
  }
  
  .card-item {
    padding: 1rem;
  }
  
  .compare-card {
    padding: 1.5rem;
  }
  
  .usp-grid {
    grid-template-columns: 1fr;
  }
  
  .timeline-step {
    padding: 2.5rem 1.5rem 1.5rem 1.5rem;
    text-align: center;
  }
  
  .step-num {
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
  }
  
  .testimonial-card {
    padding: 2rem 1.5rem;
  }
  
  .testimonial-text {
    font-size: 1rem;
  }
  
  .final-cta h2 {
    font-size: 2rem;
  }
  
  .final-cta p {
    font-size: 1rem;
  }
  
  .final-cta-btns .btn {
    width: 100%;
  }
  
  .floating-widgets {
    bottom: 1rem;
    left: 1rem;
    gap: 0.75rem;
  }
  
  .floating-btn {
    width: 3rem;
    height: 3rem;
  }
  
  .scroll-top-btn {
    bottom: 1rem;
    right: 1rem;
    width: 2.75rem;
    height: 2.75rem;
  }
}