/* 
   SYSTEM DESIGN CSS - CÔNG TY MÔI TRƯỜNG PHƯƠNG LINH 
   Designed with premium aesthetics & high conversion focus
*/

:root {
  --primary-color: #059669; /* Emerald Green */
  --primary-hover: #047857;
  --primary-light: #ecfdf5;
  --secondary-color: #0284c7; /* Ocean Blue */
  --secondary-hover: #0369a1;
  --secondary-light: #f0f9ff;
  --zalo-color: #0068ff;
  --zalo-hover: #0056d6;
  --emergency-color: #e11d48; /* Red for Call Button */
  --emergency-hover: #be123c;
  --accent-color: #f59e0b; /* Amber */
  --accent-hover: #d97706;
  
  --dark-text: #0f172a; /* Slate 900 */
  --muted-text: #475569; /* Slate 600 */
  --light-bg: #f8fafc; /* Slate 50 */
  --white: #ffffff;
  --border-color: #e2e8f0; /* Slate 200 */
  
  --font-heading: 'Be Vietnam Pro', 'Inter', sans-serif;
  --font-body: 'Be Vietnam Pro', 'Inter', sans-serif;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --radius-full: 9999px;
  
  --transition-smooth: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* 1. RESET & BASICS */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  color: var(--dark-text);
  background-color: var(--light-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Section Common Styling */
section {
  padding: 6rem 0;
  position: relative;
}

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

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
  padding-bottom: 0.75rem;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-full);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 2.25rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1.1rem;
  font-family: var(--font-heading);
  box-shadow: var(--shadow-md);
  transition: var(--transition-bounce);
  border: 2px solid transparent;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn:active {
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background: var(--primary-hover);
}

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

.btn-secondary:hover {
  background: var(--secondary-hover);
}

.btn-emergency {
  background: var(--emergency-color);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(225, 29, 72, 0.4);
}

.btn-emergency:hover {
  background: var(--emergency-hover);
}

.btn-zalo {
  background: var(--zalo-color);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(0, 104, 255, 0.3);
}

.btn-zalo:hover {
  background: var(--zalo-hover);
}

.btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--dark-text);
}

.btn-outline:hover {
  background: var(--white);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* 2. HEADER & NAVIGATION */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: var(--transition-smooth);
}

.announcement-bar {
  background: linear-gradient(135deg, var(--primary-hover), var(--secondary-hover));
  color: var(--white);
  padding: 0.5rem 0;
  font-size: 0.875rem;
  font-weight: 500;
}

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

.bar-hotline a {
  color: var(--white);
  font-weight: 700;
  border-bottom: 1px dashed var(--white);
}

.navbar-wrapper {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
  transition: var(--transition-smooth);
}

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

/* Logo Design */
.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-img {
  height: 54px;
  width: auto;
  border-radius: var(--radius-sm);
}

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

.logo-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--primary-color);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.logo-sub {
  font-size: 1rem;
  font-weight: 800;
  color: var(--secondary-color);
  letter-spacing: 2px;
}

/* Navigation Links */
.nav-menu ul {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-menu ul li a {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  color: var(--dark-text);
  padding: 0.5rem 0;
  position: relative;
}

.nav-menu ul li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2.5px;
  background: var(--primary-color);
  border-radius: var(--radius-full);
  transition: var(--transition-smooth);
}

.nav-menu ul li a:hover::after,
.nav-menu ul li a.active::after {
  width: 100%;
}

.nav-menu ul li a:hover,
.nav-menu ul li a.active {
  color: var(--primary-color);
}

/* Dropdown Menu */
.dropdown {
  position: relative;
}

.dropdown > a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.dropdown .arrow {
  font-size: 0.7rem;
  transition: var(--transition-smooth);
}

.dropdown:hover .arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(15px);
  background: var(--white);
  min-width: 240px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
  opacity: 0;
  visibility: hidden;
  display: flex;
  flex-direction: column;
  padding: 0.75rem 0;
  transition: var(--transition-smooth);
  z-index: 1010;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(5px);
}

.dropdown-menu li {
  width: 100%;
}

.dropdown-menu li a {
  display: block;
  padding: 0.7rem 1.5rem;
  font-weight: 500;
  color: var(--dark-text) !important;
  font-size: 0.95rem;
}

.dropdown-menu li a::after {
  display: none !important;
}

.dropdown-menu li a:hover {
  background-color: var(--light-bg);
  color: var(--primary-color) !important;
  padding-left: 1.75rem;
}

/* Custom Navigation Call Button */
.btn-nav-call {
  background: linear-gradient(135deg, var(--emergency-color), #f43f5e);
  color: var(--white) !important;
  padding: 0.65rem 1.5rem !important;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 10px rgba(225, 29, 72, 0.2);
  animation: pulse-border 2s infinite;
}

.btn-nav-call::after {
  display: none !important;
}

.btn-nav-call:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 15px rgba(225, 29, 72, 0.3);
}

/* Mobile Navigation Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
}

.hamburger-bar {
  width: 100%;
  height: 3px;
  background-color: var(--dark-text);
  border-radius: var(--radius-full);
  transition: var(--transition-smooth);
}

/* Header scrolled state */
.main-header.scrolled .navbar-wrapper {
  padding: 0.4rem 0;
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.98);
}

.main-header.scrolled .logo-img {
  height: 44px;
}

/* 3. HERO SECTION */
.hero-section {
  padding-top: 180px;
  padding-bottom: 8rem;
  background: radial-gradient(circle at top right, rgba(5, 150, 105, 0.08), transparent 45%),
              radial-gradient(circle at bottom left, rgba(2, 132, 199, 0.05), transparent 45%);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 5;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--primary-light);
  color: #065f46;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(5, 150, 105, 0.15);
  animation: float-slow 4s ease-in-out infinite;
}

.hero-content h1 {
  font-size: clamp(2.5rem, 4.5vw, 3.75rem);
  margin-bottom: 1.5rem;
  font-weight: 800;
}

.hero-content h1 span {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--muted-text);
  margin-bottom: 2.5rem;
  max-width: 600px;
}

.hero-ctas {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-ctas .btn {
  min-width: 220px;
}

.hero-trust-bar {
  display: flex;
  gap: 2.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.trust-item {
  display: flex;
  flex-direction: column;
}

.trust-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary-color);
  font-family: var(--font-heading);
}

.trust-text {
  font-size: 0.875rem;
  color: var(--muted-text);
  font-weight: 500;
}

/* Hero Media */
.hero-media {
  position: relative;
  z-index: 5;
}

.hero-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 6px solid var(--white);
  transform: rotate(1deg);
  transition: var(--transition-smooth);
}

.hero-image-wrapper:hover {
  transform: rotate(0) scale(1.02);
}

.hero-image-wrapper img {
  width: 100%;
  height: 480px;
  object-fit: cover;
}

/* Subtle decorative shapes */
.hero-shape-1 {
  position: absolute;
  top: 10%;
  right: -5%;
  width: 300px;
  height: 300px;
  background: rgba(5, 150, 105, 0.05);
  border-radius: 50%;
  filter: blur(80px);
  z-index: 1;
}

.hero-shape-2 {
  position: absolute;
  bottom: 5%;
  left: -5%;
  width: 250px;
  height: 250px;
  background: rgba(2, 132, 199, 0.04);
  border-radius: 50%;
  filter: blur(80px);
  z-index: 1;
}

/* 4. SERVICES SECTION */
.services-section {
  background-color: var(--white);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2.25rem;
}

.service-card {
  background: var(--light-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition-bounce);
  display: flex;
  flex-direction: column;
  height: 100%;
}

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

.service-img-wrapper {
  position: relative;
  padding-top: 60%;
  overflow: hidden;
}

.service-img-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.service-card:hover .service-img-wrapper img {
  transform: scale(1.06);
}

.service-badge {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(4px);
  color: var(--white);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.service-card-content {
  padding: 2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.service-card-content h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.service-card-content p {
  color: var(--muted-text);
  font-size: 0.975rem;
  margin-bottom: 1.75rem;
  flex-grow: 1;
}

.service-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 1.25rem;
  margin-top: auto;
}

.service-link {
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.service-link:hover {
  color: var(--secondary-color);
}

.service-link::after {
  content: '→';
  transition: var(--transition-bounce);
}

.service-card:hover .service-link::after {
  transform: translateX(5px);
}

.service-quick-book {
  background: var(--zalo-color);
  color: var(--white);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  box-shadow: 0 2px 8px rgba(0, 104, 255, 0.2);
}

.service-quick-book:hover {
  background: var(--zalo-hover);
  transform: scale(1.05);
}

.service-quick-book svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* 5. PROCESS SECTION */
.process-section {
  background-color: var(--light-bg);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  position: relative;
}

.process-card {
  background: var(--white);
  padding: 2.5rem 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  text-align: center;
  position: relative;
  transition: var(--transition-smooth);
  z-index: 5;
}

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

.process-number {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
  color: var(--primary-color);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.75rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  box-shadow: 0 4px 10px rgba(5, 150, 105, 0.1);
  transition: var(--transition-smooth);
}

.process-card:hover .process-number {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
}

.process-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.process-card p {
  color: var(--muted-text);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* 6. PRICE ESTIMATOR */
.price-section {
  background: linear-gradient(135deg, #059669, #0284c7);
  color: var(--white);
  position: relative;
}

.price-container {
  max-width: 800px;
  margin: 0 auto;
  background: var(--white);
  color: var(--dark-text);
  padding: 3.5rem 3rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  text-align: center;
  position: relative;
  z-index: 5;
}

.price-container h2 {
  color: var(--primary-color);
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.price-container p {
  color: var(--muted-text);
  margin-bottom: 2.5rem;
}

.estimator-select-wrapper {
  position: relative;
  max-width: 500px;
  margin: 0 auto 2rem;
}

.estimator-select {
  width: 100%;
  padding: 1.25rem 1.5rem;
  font-size: 1.1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  appearance: none;
  background-color: var(--light-bg);
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.estimator-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(5, 150, 105, 0.1);
}

.estimator-select-wrapper::after {
  content: '▼';
  font-size: 0.8rem;
  color: var(--muted-text);
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

.price-result-box {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.price-result {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--emergency-color);
  font-family: var(--font-heading);
}

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

.price-cta-group .btn {
  min-width: 240px;
}

/* 7. WHY CHOOSE US (USP) */
.usp-section {
  background-color: var(--white);
}

.usp-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: center;
}

.usp-image-wrapper {
  position: relative;
}

.usp-image-wrapper img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}

.usp-years-badge {
  position: absolute;
  bottom: -2rem;
  right: -2rem;
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  text-align: center;
  border: 1px solid var(--border-color);
}

.usp-years-badge .years {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary-color);
  display: block;
  line-height: 1;
}

.usp-years-badge .years-text {
  font-size: 0.9rem;
  color: var(--muted-text);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.usp-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.usp-item {
  display: flex;
  gap: 1.25rem;
}

.usp-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.usp-info h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.usp-info p {
  color: var(--muted-text);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* 8. TESTIMONIALS SECTION */
.testimonials-section {
  background-color: var(--light-bg);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2.5rem;
}

.testimonial-card {
  background: var(--white);
  padding: 3rem 2.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  position: relative;
  transition: var(--transition-smooth);
}

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

.testimonial-quote-icon {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  font-size: 4rem;
  color: rgba(5, 150, 105, 0.08);
  font-family: Georgia, serif;
  line-height: 1;
  user-select: none;
}

.testi-stars {
  color: var(--accent-color);
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  letter-spacing: 2px;
}

.testimonial-card p {
  color: var(--muted-text);
  font-style: italic;
  font-size: 1rem;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.testi-author {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.testi-avatar-img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--primary-light);
}

.testi-author-info {
  display: flex;
  flex-direction: column;
}

.testi-author-name {
  font-weight: 700;
  font-size: 1.05rem;
}

.testi-author-location {
  font-size: 0.85rem;
  color: var(--muted-text);
}

/* 9. SERVING AREAS */
.areas-section {
  background-color: var(--white);
}

.areas-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.area-card {
  background: var(--light-bg);
  padding: 3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.area-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.area-card-title {
  color: var(--primary-color);
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.75rem;
  font-family: var(--font-heading);
}

.area-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.area-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted-text);
  font-weight: 500;
}

.area-list li::before {
  content: '✓';
  color: var(--primary-color);
  font-weight: 900;
}

/* 10. FAQ SECTION */
.faq-section {
  background-color: var(--light-bg);
}

.faq-container {
  max-width: 850px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-trigger {
  width: 100%;
  text-align: left;
  padding: 1.5rem 2rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--dark-text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.faq-trigger:hover {
  color: var(--primary-color);
}

.faq-icon {
  font-size: 1.5rem;
  color: var(--primary-color);
  transition: var(--transition-smooth);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  background-color: rgba(248, 250, 252, 0.5);
}

.faq-content-inner {
  padding: 0 2rem 1.5rem;
  color: var(--muted-text);
  font-size: 1rem;
  line-height: 1.7;
}

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

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* 11. FOOTER SECTION */
.main-footer-section {
  background-color: var(--dark-text);
  color: #94a3b8;
  padding: 0;
}

/* Footer Form */
.footer-form-wrapper {
  background: #1e293b;
  padding: 5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.form-card {
  max-width: 900px;
  margin: 0 auto;
  background: var(--white);
  color: var(--dark-text);
  padding: 3rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.form-header {
  text-align: center;
  margin-bottom: 2rem;
}

.form-header h3 {
  font-size: 1.75rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.form-header p {
  color: var(--muted-text);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.form-group {
  width: 100%;
}

.form-group.submit-group {
  grid-column: 1 / -1;
  text-align: center;
}

.form-input {
  width: 100%;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border-color);
  background-color: var(--light-bg);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: var(--transition-smooth);
}

.form-input:focus {
  border-color: var(--primary-color);
  background-color: var(--white);
}

.btn-form-submit {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  font-weight: 700;
  padding: 1rem 3rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  transition: var(--transition-bounce);
}

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

.form-response-msg {
  text-align: center;
  margin-top: 1rem;
  font-weight: 600;
}

.form-response-msg.success {
  color: var(--primary-color);
}

.form-response-msg.error {
  color: var(--emergency-color);
}

/* Footer Info Grid */
.footer-info-wrapper {
  padding: 5rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1.2fr 0.8fr;
  gap: 3.5rem;
}

.footer-col-title {
  color: var(--white);
  font-size: 1.2rem;
  margin-bottom: 1.75rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-col-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2.5px;
  background-color: var(--primary-color);
  border-radius: var(--radius-full);
}

.company-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.company-tax {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  color: var(--white);
}

.company-slogan {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary-color);
  font-style: italic;
}

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

.footer-links li {
  margin-bottom: 0.85rem;
}

.footer-links li a {
  font-size: 0.9rem;
  transition: var(--transition-smooth);
}

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

.footer-contact-list {
  list-style: none;
}

.footer-contact-list li {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
}

.contact-icon {
  font-size: 1.1rem;
}

.contact-text strong {
  color: var(--white);
}

.contact-text a {
  color: var(--white);
  font-weight: 700;
}

.contact-text a:hover {
  color: var(--primary-color);
}

.license-img-wrapper {
  background: var(--white);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.license-img {
  width: 120px;
  height: auto;
}

/* Footer Bottom */
.footer-bottom-bar {
  background-color: #0f172a;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.bottom-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.social-links {
  display: flex;
  gap: 1.5rem;
}

.social-link {
  font-weight: 600;
  transition: var(--transition-smooth);
}

.social-link:hover {
  color: var(--white);
}

/* 12. FLOATING BUTTONS & CTAs */
.floating-ctas {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  z-index: 999;
}

.floating-btn {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 56px;
  background: var(--white);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  color: var(--white);
  width: 56px;
  transition: width 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), background 0.3s;
}

.float-btn-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition-smooth);
}

.float-btn-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.float-btn-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  padding-right: 1.5rem;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s;
}

.floating-btn:hover {
  width: 220px;
}

.floating-btn:hover .float-btn-text {
  opacity: 1;
}

.float-call {
  background-color: var(--emergency-color);
  box-shadow: 0 4px 15px rgba(225, 29, 72, 0.4);
}

.float-call:hover {
  background-color: var(--emergency-hover);
}

.float-zalo {
  background-color: var(--zalo-color);
  box-shadow: 0 4px 15px rgba(0, 104, 255, 0.4);
}

.float-zalo:hover {
  background-color: var(--zalo-hover);
}

.float-zalo .float-btn-icon svg {
  width: 28px;
  height: 28px;
}

.float-messenger {
  background-color: #a855f7; /* Purple */
  width: 46px; /* Smaller than call and zalo */
  height: 46px;
  align-self: flex-end;
  box-shadow: 0 4px 10px rgba(168, 85, 247, 0.3);
}

.float-messenger .float-btn-icon {
  width: 46px;
  height: 46px;
}

.float-messenger .float-btn-icon svg {
  width: 20px;
  height: 20px;
}

.float-messenger:hover {
  width: 46px; /* Do not expand messenger */
}

/* Back to Top */
.back-to-top-btn {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  width: 46px;
  height: 46px;
  background-color: var(--white);
  border: 1px solid var(--border-color);
  color: var(--muted-text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
}

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

/* 13. PAGE HEADERS FOR SUBPAGES */
.page-header-section {
  background: linear-gradient(135deg, var(--primary-hover), var(--secondary-hover));
  color: var(--white);
  padding: 10rem 0 5rem;
  text-align: center;
  position: relative;
}

.page-header-section h1 {
  font-size: 3rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.page-header-section p {
  font-size: 1.15rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 1.5rem;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.breadcrumb a {
  opacity: 0.8;
}

.breadcrumb a:hover {
  opacity: 1;
}

.breadcrumb span {
  opacity: 0.5;
}

/* 14. SERVICE DETAIL LAYOUT */
.subpage-container {
  padding: 5rem 0;
}

.subpage-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr;
  gap: 3.5rem;
}

.service-main-content {
  background-color: var(--white);
  padding: 3.5rem 3rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.service-main-content h2 {
  font-size: 1.85rem;
  margin: 2.25rem 0 1.25rem;
  color: var(--primary-color);
}

.service-main-content h2:first-of-type {
  margin-top: 0;
}

.service-main-content h3 {
  font-size: 1.35rem;
  margin: 1.75rem 0 1rem;
}

.service-main-content p {
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
  color: var(--muted-text);
  line-height: 1.8;
}

.service-main-content ul, .service-main-content ol {
  margin-bottom: 1.75rem;
  padding-left: 1.5rem;
  color: var(--muted-text);
  font-size: 1.05rem;
}

.service-main-content li {
  margin-bottom: 0.5rem;
}

.service-main-content figure {
  margin: 2.5rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 4px solid var(--light-bg);
}

.service-main-content figcaption {
  background: var(--light-bg);
  padding: 0.75rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted-text);
  font-style: italic;
  border-top: 1px solid var(--border-color);
}

/* Sidebar styling */
.sidebar-col {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.widget {
  background: var(--white);
  padding: 2.25rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.widget-title {
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
  border-bottom: 2.5px solid var(--primary-color);
  padding-bottom: 0.5rem;
  display: inline-block;
}

.widget-links {
  list-style: none;
}

.widget-links li {
  border-bottom: 1px dashed var(--border-color);
}

.widget-links li:last-child {
  border-bottom: none;
}

.widget-links li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  font-weight: 600;
  color: var(--muted-text);
}

.widget-links li a:hover {
  color: var(--primary-color);
  padding-left: 5px;
}

.widget-contact-card {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  text-align: center;
  padding: 3rem 2rem;
}

.widget-contact-card .widget-title {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.4);
}

.widget-contact-card p {
  margin-bottom: 2rem;
  opacity: 0.95;
  font-size: 1rem;
}

.widget-contact-card .btn {
  width: 100%;
}

/* Zalo Booking Banner at end of services */
.zalo-booking-banner {
  background: linear-gradient(135deg, var(--zalo-color), #0099ff);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  margin: 3.5rem 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  box-shadow: 0 10px 25px rgba(0, 104, 255, 0.25);
  position: relative;
  overflow: hidden;
}

.zalo-banner-content {
  flex-grow: 1;
}

.zalo-banner-content h4 {
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.zalo-banner-content p {
  color: rgba(255, 255, 255, 0.95) !important;
  margin-bottom: 0 !important;
  font-size: 1rem !important;
}

.zalo-banner-btn {
  background: var(--white);
  color: var(--zalo-color);
  padding: 0.85rem 2rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-bounce);
}

.zalo-banner-btn:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
  background: var(--light-bg);
}

/* 15. NEWS/BLOG GRID & LATEST POSTS */
.news-filter-wrapper {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.6rem 1.5rem;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-family: var(--font-heading);
  transition: var(--transition-smooth);
}

.filter-btn.active, .filter-btn:hover {
  background: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.news-grid-layout {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2.5rem;
}

.news-card-item {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition-bounce);
}

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

.news-img-holder {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
}

.news-img-holder img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-card-details {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.news-meta-info {
  display: flex;
  gap: 1rem;
  color: var(--muted-text);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.news-card-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.news-card-excerpt {
  color: var(--muted-text);
  font-size: 0.925rem;
  margin-bottom: 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-read-more-btn {
  color: var(--primary-color);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: auto;
}

.news-read-more-btn::after {
  content: '→';
  transition: var(--transition-smooth);
}

.news-card-item:hover .news-read-more-btn::after {
  transform: translateX(4px);
}

/* Blog post details layout inline */
.blog-details-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 2rem;
}

/* 16. GALLERY MASONRY LIGHTBOX */
.gallery-section {
  background-color: var(--white);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  aspect-ratio: 4 / 3;
  border: 3px solid var(--white);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.gallery-item:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-xl);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(15, 23, 42, 0.8), transparent);
  opacity: 0;
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
  transition: var(--transition-smooth);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-info h4 {
  color: var(--white);
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.gallery-info span {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.8rem;
  font-weight: 500;
}

/* Lightbox Modal CSS */
.lightbox-modal {
  display: none;
  position: fixed;
  z-index: 2000;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(5px);
}

.lightbox-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 800px;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border: 4px solid var(--white);
  animation: zoom-in-ani 0.3s ease-out;
}

.lightbox-caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 800px;
  text-align: center;
  color: var(--white);
  padding: 1.25rem 0;
  font-weight: 600;
  font-family: var(--font-heading);
}

.lightbox-close {
  position: absolute;
  top: 40px;
  right: 40px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
  cursor: pointer;
}

.lightbox-close:hover {
  color: var(--emergency-color);
}

/* 17. ANIMATIONS */
@keyframes pulse-border {
  0% { box-shadow: 0 0 0 0 rgba(225, 29, 72, 0.4); }
  70% { box-shadow: 0 0 0 10px rgba(225, 29, 72, 0); }
  100% { box-shadow: 0 0 0 0 rgba(225, 29, 72, 0); }
}

@keyframes pulse-zalo {
  0% { box-shadow: 0 0 0 0 rgba(0, 104, 255, 0.5); }
  70% { box-shadow: 0 0 0 12px rgba(0, 104, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 104, 255, 0); }
}

.pulse-animation {
  animation: pulse-border 2.5s infinite;
}

.float-zalo.pulse-animation {
  animation: pulse-zalo 2.5s infinite;
}

@keyframes float-slow {
  0% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
  100% { transform: translateY(0); }
}

@keyframes zoom-in-ani {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* Scroll Fade In */
.scroll-fade {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.75s ease-out, transform 0.75s ease-out;
}

.scroll-fade.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 18. RESPONSIVE MEDIA QUERIES */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
  
  .hero-grid {
    gap: 2rem;
  }
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  
  .hero-ctas {
    justify-content: center;
  }
  
  .hero-trust-bar {
    justify-content: center;
  }
  
  .hero-image-wrapper img {
    height: 380px;
  }
  
  .subpage-grid {
    grid-template-columns: 1fr;
  }
  
  .areas-grid {
    grid-template-columns: 1fr;
  }
  
  .zalo-booking-banner {
    flex-direction: column;
    text-align: center;
    padding: 2.5rem 2rem;
  }
  
  .zalo-banner-btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  section {
    padding: 4rem 0;
  }
  
  .section-header {
    margin-bottom: 2.5rem;
  }
  
  .section-header h2 {
    font-size: 2rem;
  }
  
  .announcement-bar {
    display: none; /* Hide top bar on mobile to save space */
  }
  
  .mobile-toggle {
    display: flex;
    z-index: 1050;
  }
  
  /* Mobile Nav Menu drawer style */
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--white);
    box-shadow: var(--shadow-xl);
    padding: 5rem 2rem 2rem;
    transition: var(--transition-bounce);
    z-index: 1040;
  }
  
  .nav-menu.open {
    right: 0;
  }
  
  .nav-menu ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }
  
  .nav-menu ul li {
    width: 100%;
  }
  
  .nav-menu ul li a {
    display: block;
    width: 100%;
    font-size: 1.15rem;
    padding: 0.5rem 0;
  }
  
  .dropdown-menu {
    position: static;
    transform: none !important;
    opacity: 1;
    visibility: visible;
    display: none;
    box-shadow: none;
    border: none;
    background-color: var(--light-bg);
    margin-top: 0.5rem;
    border-radius: var(--radius-sm);
  }
  
  .dropdown.open .dropdown-menu {
    display: flex;
  }
  
  .btn-nav-call {
    text-align: center;
    width: 100%;
    display: block !important;
  }
  
  .mobile-toggle.active .hamburger-bar:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }
  
  .mobile-toggle.active .hamburger-bar:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-toggle.active .hamburger-bar:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .usp-grid {
    grid-template-columns: 1fr;
  }
  
  .usp-image-wrapper {
    max-width: 400px;
    margin: 0 auto;
  }
  
  .usp-years-badge {
    padding: 1.25rem;
    right: -1rem;
    bottom: -1rem;
  }
  
  .usp-years-badge .years {
    font-size: 2.25rem;
  }
  
  .price-container {
    padding: 2.5rem 1.5rem;
  }
  
  .estimator-select {
    padding: 1rem;
    font-size: 1rem;
  }
  
  .price-result {
    text-align: center;
  }
  
  .floating-ctas {
    display: none !important;
  }
  
  .back-to-top-btn {
    bottom: 5.5rem;
  }
  
  .mobile-sticky-bar {
    display: flex;
  }
  
  body {
    padding-bottom: 60px;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .area-list {
    grid-template-columns: 1fr;
  }
  
  .bottom-content {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .logo-img {
    height: 40px;
  }
  
  .logo-title {
    font-size: 0.95rem;
  }
  
  .logo-sub {
    font-size: 0.8rem;
  }
}

/* Nav Overlay Backdrop */
.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1030;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.nav-overlay.open {
  opacity: 1;
  visibility: visible;
}

/* Mobile Sticky Bottom Bar (Conversion Focus) */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-color);
  z-index: 1020;
  box-shadow: 0 -4px 20px rgba(15, 23, 42, 0.08);
}

.sticky-bar-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 100%;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--white);
  transition: all 0.3s ease;
  text-decoration: none;
}

.sticky-call {
  background-color: var(--emergency-color);
}

.sticky-call:hover {
  background-color: var(--emergency-hover);
}

.sticky-zalo {
  background-color: var(--zalo-color);
}

.sticky-zalo:hover {
  background-color: var(--zalo-hover);
}

.sticky-bar-btn .btn-icon {
  font-size: 1.15rem;
}