/* ====================================================================
   LUXURY DESIGN SYSTEM: CÁCH NHIỆT HOÀNG GIA
   Palette: Royal Navy (#0B192C, #1E3E62) & Champagne Gold (#D4AF37, #F3C623)
   ==================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Playfair+Display:ital,wght@0,600;0,700;1,600&display=swap');

:root {
  /* Colors */
  --navy-dark: #071220;
  --navy-primary: #0B192C;
  --navy-light: #1E3E62;
  --navy-subtle: #2A4F79;
  
  --gold-primary: #D4AF37;
  --gold-light: #F3C623;
  --gold-dark: #AA820A;
  --gold-gradient: linear-gradient(135deg, #FFE259 0%, #D4AF37 100%);
  --gold-glow: 0 4px 20px rgba(212, 175, 55, 0.35);

  --bg-light: #F8FAFC;
  --bg-card: #FFFFFF;
  --text-main: #1E293B;
  --text-muted: #64748B;
  --border-color: #E2E8F0;

  /* Typography */
  --font-main: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;

  /* Layout & Spacing */
  --max-width: 1240px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 2px 8px rgba(11, 25, 44, 0.06);
  --shadow-md: 0 10px 30px rgba(11, 25, 44, 0.08);
  --shadow-lg: 0 20px 45px rgba(11, 25, 44, 0.12);
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-light);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Helper Text */
.text-gold {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  font-weight: 700;
}

.badge-gold {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(212, 175, 55, 0.12);
  color: #B8860B;
  border: 1px solid rgba(212, 175, 55, 0.3);
  padding: 6px 14px;
  border-radius: 99px;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-align: center;
}

.btn-gold {
  background: var(--gold-gradient);
  color: var(--navy-dark);
  box-shadow: var(--gold-glow);
  font-weight: 700;
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(212, 175, 55, 0.5);
}

.btn-navy {
  background: var(--navy-primary);
  color: #FFFFFF;
}

.btn-navy:hover {
  background: var(--navy-light);
  transform: translateY(-2px);
}

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

.btn-outline-gold:hover {
  background: var(--gold-primary);
  color: var(--navy-dark);
}

/* ====================================================================
   HEADER & NAVIGATION
   ==================================================================== */
.top-bar {
  background: var(--navy-dark);
  color: #94A3B8;
  font-size: 0.85rem;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.top-bar-contact {
  display: flex;
  gap: 20px;
  align-items: center;
}

.top-bar-contact a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #CBD5E1;
}

.top-bar-contact a:hover {
  color: var(--gold-light);
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(11, 25, 44, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  transition: var(--transition);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 44px;
  height: 44px;
  background: var(--gold-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy-dark);
  font-size: 1.4rem;
  font-weight: 800;
  box-shadow: var(--gold-glow);
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: 0.5px;
  line-height: 1.2;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--gold-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  list-style: none;
}

.nav-link {
  color: #E2E8F0;
  font-weight: 500;
  font-size: 0.98rem;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--gold-light);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gold-gradient);
  border-radius: 2px;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-hotline {
  display: flex;
  flex-direction: column;
  text-align: right;
}

.nav-hotline-label {
  font-size: 0.72rem;
  color: #94A3B8;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-hotline-number {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--gold-light);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: #FFFFFF;
  font-size: 1.8rem;
  cursor: pointer;
}

/* ====================================================================
   HERO SECTION
   ==================================================================== */
.hero {
  position: relative;
  background: linear-gradient(135deg, rgba(7, 18, 32, 0.94) 0%, rgba(11, 25, 44, 0.88) 100%),
              url('https://images.unsplash.com/photo-1600596542815-ffad4c1539a9?auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
  color: #FFFFFF;
  padding: 100px 0 120px;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60px;
  background: linear-gradient(to top, var(--bg-light), transparent);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 50px;
  align-items: center;
}

.hero-content h2 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 18px 0 20px;
  letter-spacing: -0.5px;
}

.hero-content p {
  font-size: 1.12rem;
  color: #CBD5E1;
  margin-bottom: 30px;
  line-height: 1.7;
}

.hero-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  margin-bottom: 35px;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: #E2E8F0;
}

.hero-feature-item svg {
  color: var(--gold-light);
  flex-shrink: 0;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero Quick Quote Card */
.hero-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: var(--radius-lg);
  padding: 35px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.hero-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.hero-card p {
  font-size: 0.9rem;
  color: #CBD5E1;
  margin-bottom: 22px;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: #E2E8F0;
  margin-bottom: 6px;
}

.form-input, .form-select {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  color: #FFFFFF;
  outline: none;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus {
  border-color: var(--gold-light);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.2);
}

.form-select option {
  background: var(--navy-dark);
  color: #FFFFFF;
}

/* ====================================================================
   STATS BAR
   ==================================================================== */
.stats-section {
  margin-top: -50px;
  position: relative;
  z-index: 10;
}

.stats-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 30px;
  border: 1px solid var(--border-color);
}

.stat-item {
  text-align: center;
  padding: 10px 20px;
  border-right: 1px solid var(--border-color);
}

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

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--navy-primary);
  line-height: 1.1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ====================================================================
   SECTION HEADERS
   ==================================================================== */
.section {
  padding: 90px 0;
}

.section-dark {
  background: var(--navy-primary);
  color: #FFFFFF;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 55px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--navy-primary);
  margin: 12px 0 16px;
  line-height: 1.25;
}

.section-dark .section-title {
  color: #FFFFFF;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.section-dark .section-desc {
  color: #94A3B8;
}

/* ====================================================================
   SERVICES GRID
   ==================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.service-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(212, 175, 55, 0.4);
}

.service-img {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.service-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.service-card:hover .service-img img {
  transform: scale(1.08);
}

.service-badge {
  position: absolute;
  top: 15px;
  left: 15px;
  background: var(--navy-dark);
  color: var(--gold-light);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid rgba(212, 175, 55, 0.4);
}

.service-body {
  padding: 26px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.service-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--navy-primary);
}

.service-body p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.service-specs {
  list-style: none;
  margin-bottom: 22px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
}

.service-specs li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-main);
  margin-bottom: 8px;
  font-weight: 500;
}

.service-specs li svg {
  color: var(--gold-primary);
  flex-shrink: 0;
}

.service-footer {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.service-price {
  font-size: 1.15rem;
  font-weight: 800;
  color: #B8860B;
}

.service-price span {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* ====================================================================
   INTERACTIVE COST CALCULATOR (ESTIMATOR WIDGET)
   ==================================================================== */
.calculator-box {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  border: 2px solid rgba(212, 175, 55, 0.3);
  max-width: 900px;
  margin: 0 auto;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
}

.calc-inputs h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy-primary);
  margin-bottom: 20px;
}

.range-wrap {
  margin: 20px 0;
}

.range-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}

.range-slider {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: #E2E8F0;
  outline: none;
  -webkit-appearance: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gold-gradient);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.calc-result-box {
  background: var(--navy-dark);
  color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.calc-result-title {
  font-size: 0.88rem;
  color: #94A3B8;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.calc-result-price {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--gold-light);
  margin: 10px 0 5px;
}

.calc-result-note {
  font-size: 0.82rem;
  color: #CBD5E1;
  margin-bottom: 20px;
}

/* ====================================================================
   PROJECTS / GALLERY SECTION
   ==================================================================== */
.gallery-filters {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 9px 22px;
  border-radius: 99px;
  border: 1px solid var(--border-color);
  background: #FFFFFF;
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--navy-primary);
  color: var(--gold-light);
  border-color: var(--navy-primary);
  box-shadow: 0 4px 14px rgba(11, 25, 44, 0.15);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.project-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  height: 360px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.project-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7, 18, 32, 0.95) 0%, rgba(7, 18, 32, 0.2) 60%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 26px;
  color: #FFFFFF;
  transition: var(--transition);
}

.project-card:hover img {
  transform: scale(1.1);
}

.project-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gold-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.project-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.35;
}

.project-meta {
  font-size: 0.85rem;
  color: #CBD5E1;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Lightbox Modal */
.lightbox-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(8px);
  padding: 30px;
  align-items: center;
  justify-content: center;
}

.lightbox-modal.active {
  display: flex;
}

.lightbox-content {
  max-width: 900px;
  width: 100%;
  background: var(--navy-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(212, 175, 55, 0.4);
  position: relative;
  color: #FFFFFF;
}

.lightbox-close {
  position: absolute;
  top: 15px;
  right: 15px;
  background: rgba(0, 0, 0, 0.6);
  border: none;
  color: #FFFFFF;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.lightbox-img {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
}

.lightbox-body {
  padding: 25px 30px;
}

/* ====================================================================
   PRICING TABLE SECTION
   ==================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.pricing-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 32px 24px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.pricing-card.featured {
  border: 2px solid var(--gold-primary);
  box-shadow: 0 10px 35px rgba(212, 175, 55, 0.2);
  transform: translateY(-8px);
}

.pricing-featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gold-gradient);
  color: var(--navy-dark);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.pricing-header h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy-primary);
  margin-bottom: 12px;
}

.pricing-amount {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--navy-primary);
  line-height: 1.1;
  margin-bottom: 6px;
}

.pricing-amount span {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: 25px 0;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  margin-bottom: 12px;
  color: var(--text-main);
}

.pricing-features li svg {
  color: var(--gold-primary);
  flex-shrink: 0;
}

/* ====================================================================
   SEO BLOG / GÓC CHIA SẺ
   ==================================================================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.blog-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.blog-img {
  height: 200px;
  overflow: hidden;
}

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

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

.blog-body {
  padding: 24px;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 15px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.blog-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy-primary);
  margin-bottom: 12px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-title:hover {
  color: var(--gold-primary);
}

.blog-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Table in Articles */
.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 25px 0;
  font-size: 0.92rem;
}

.article-table th, .article-table td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-table th {
  background: var(--navy-primary);
  color: #FFFFFF;
}

.article-table tr:nth-child(even) {
  background: #F1F5F9;
}

/* ====================================================================
   TESTIMONIALS (REVIEWS)
   ==================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.review-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.review-stars {
  color: #F59E0B;
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.review-comment {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.7;
  margin-bottom: 22px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy-dark);
  font-weight: 700;
  font-size: 1.1rem;
}

.review-info h5 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--navy-primary);
}

.review-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ====================================================================
   FAQ ACCORDION
   ==================================================================== */
.faq-wrap {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: #FFFFFF;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: transparent;
  border: none;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--navy-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-question svg {
  transition: transform 0.3s ease;
  color: var(--gold-primary);
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  padding-bottom: 20px;
}

/* ====================================================================
   CONTACT & MAP SECTION
   ==================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}

.contact-info-card {
  background: var(--navy-dark);
  color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 40px;
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 25px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  background: rgba(212, 175, 55, 0.15);
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold-light);
  flex-shrink: 0;
}

.contact-details h5 {
  font-size: 0.85rem;
  color: #94A3B8;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.contact-details p {
  font-size: 1rem;
  color: #F8FAFC;
  font-weight: 500;
}

.map-container {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  height: 400px;
  border: 1px solid var(--border-color);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ====================================================================
   FOOTER
   ==================================================================== */
.footer {
  background: var(--navy-dark);
  color: #94A3B8;
  padding: 80px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-col h4 {
  color: #FFFFFF;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 35px;
  height: 2px;
  background: var(--gold-gradient);
}

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

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: #CBD5E1;
  font-size: 0.92rem;
  transition: var(--transition);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
}

/* ====================================================================
   MOBILE STICKY QUICK ACTION BAR (CONVERSION BOOSTER)
   ==================================================================== */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 18, 32, 0.96);
  backdrop-filter: blur(12px);
  border-top: 1px solid rgba(212, 175, 55, 0.3);
  padding: 8px 15px;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

.mobile-bar-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.mobile-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 6px;
  border-radius: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  text-align: center;
  gap: 4px;
}

.mobile-btn svg {
  width: 20px;
  height: 20px;
}

.mobile-btn-call {
  background: #DC2626;
  color: #FFFFFF;
}

.mobile-btn-zalo {
  background: #0068FF;
  color: #FFFFFF;
}

.mobile-btn-quote {
  background: var(--gold-gradient);
  color: var(--navy-dark);
}

/* Desktop Floating Contact Bubbles */
.floating-contact {
  position: fixed;
  bottom: 30px;
  right: 30px;
  display: flex;
  flex-direction: column;
  gap: 15px;
  z-index: 900;
}

.float-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
  transition: var(--transition);
  position: relative;
}

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

.float-call {
  background: #DC2626;
}

.float-zalo {
  background: #0068FF;
}

/* Pulsing aura */
.float-btn::before {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: inherit;
  opacity: 0.4;
  animation: pulse-ring 2s infinite;
  z-index: -1;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.6; }
  100% { transform: scale(1.4); opacity: 0; }
}

/* ====================================================================
   RESPONSIVE MEDIA QUERIES (100% MOBILE-READY)
   ==================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .calc-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .top-bar {
    display: none;
  }
  .navbar-inner {
    height: 70px;
  }
  .menu-toggle {
    display: block;
  }
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--navy-dark);
    flex-direction: column;
    padding: 30px;
    gap: 20px;
    border-bottom: 2px solid var(--gold-primary);
    transform: translateY(-150%);
    transition: transform 0.4s ease;
  }
  .nav-links.active {
    transform: translateY(0);
  }
  .nav-cta {
    display: none;
  }
  .hero-content h2 {
    font-size: 2.2rem;
  }
  .hero-features {
    grid-template-columns: 1fr;
  }
  .stats-card {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
  }
  .stat-item:nth-child(3), .stat-item:nth-child(4) {
    border-bottom: none;
  }
  .services-grid, .projects-grid, .blog-grid, .reviews-grid, .contact-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.featured {
    transform: none;
  }
  .mobile-sticky-bar {
    display: block;
  }
  .floating-contact {
    display: none;
  }
  body {
    padding-bottom: 65px;
  }
}