/* Style for S-LIGHT TOWER Landing Page */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* Color Palette */
  --color-primary: #0F1E36;      /* Royal Blue (Deep) */
  --color-primary-light: #1E314F;
  --color-accent-gold: #D4AF37;  /* Metallic Gold */
  --color-accent-gold-gradient: linear-gradient(135deg, #F3C68F 0%, #D4AF37 50%, #B8860B 100%);
  --color-accent-gold-hover: linear-gradient(135deg, #F8DCA3 0%, #E6C25E 50%, #D4AF37 100%);
  --color-bg-white: #FFFFFF;
  --color-bg-light: #F8FAFC;
  --color-text-dark: #1E293B;
  --color-text-gray: #64748B;
  --color-text-light: #F1F5F9;
  --color-error: #D93025;
  --color-success: #188038;

  /* Typography */
  --font-title: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Shadows & Borders */
  --shadow-light: 0 4px 6px -1px rgba(15, 30, 54, 0.05), 0 2px 4px -1px rgba(15, 30, 54, 0.03);
  --shadow-medium: 0 10px 15px -3px rgba(15, 30, 54, 0.08), 0 4px 6px -2px rgba(15, 30, 54, 0.04);
  --shadow-premium: 0 20px 25px -5px rgba(15, 30, 54, 0.1), 0 10px 10px -5px rgba(15, 30, 54, 0.04);
  --shadow-gold: 0 10px 20px -5px rgba(212, 175, 55, 0.3);
  --radius-card: 16px;
  --radius-button: 8px;

  /* Layout */
  --header-height: 80px;
  --section-padding: 100px 0;
  --section-padding-mobile: 60px 0;
}

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

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

body {
  overflow-x: hidden;
}

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

p {
  color: var(--color-text-gray);
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

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

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg-light);
}
::-webkit-scrollbar-thumb {
  background: var(--color-primary-light);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-gold);
}

/* Accessibility Focus States */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
details summary:focus-visible {
  outline: 3px solid var(--color-accent-gold);
  outline-offset: 3px;
}

/* Typography Utilities */
.text-gold {
  color: var(--color-accent-gold);
  background: var(--color-accent-gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.text-center { text-align: center; }

/* Grid / Flex Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-button);
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
}

.btn-gold {
  background: var(--color-accent-gold-gradient);
  color: #FFFFFF;
  box-shadow: var(--shadow-gold);
}

.btn-gold:hover {
  background: var(--color-accent-gold-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -5px rgba(212, 175, 55, 0.45);
}

.btn-gold:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(5px);
}

.btn-outline:hover {
  background: #FFFFFF;
  color: var(--color-primary);
  border-color: #FFFFFF;
  transform: translateY(-2px);
}

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

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

/* Glassmorphism Class */
.glass {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: var(--shadow-medium);
}

.glass-dark {
  background: rgba(15, 30, 54, 0.75);
  backdrop-filter: blur(12px) saturate(150%);
  -webkit-backdrop-filter: blur(12px) saturate(150%);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Section Common Styles */
section {
  padding: var(--section-padding);
  position: relative;
}

.section-light {
  background-color: var(--color-bg-white);
}

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

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

.section-dark h2 {
  color: #FFFFFF;
}

.section-header {
  max-width: 700px;
  margin: 0 auto 60px auto;
  text-align: center;
}

.section-badge {
  display: inline-block;
  font-family: var(--font-title);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-accent-gold);
  margin-bottom: 12px;
  border-bottom: 2px solid var(--color-accent-gold);
  padding-bottom: 4px;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

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

.section-dark .section-subtitle {
  color: rgba(255, 255, 255, 0.7);
}

/* Form Styles & Required Field Feedback */
.form-group {
  margin-bottom: 20px;
  position: relative;
  text-align: left;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
  font-family: var(--font-title);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #CBD5E1;
  border-radius: var(--radius-button);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background-color: #FFFFFF;
  color: var(--color-text-dark);
  transition: all 0.3s ease;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(15, 30, 54, 0.15);
}

/* Error feedback following modern web guidelines */
.error-msg {
  display: none;
  color: var(--color-error);
  font-size: 0.75rem;
  margin-top: 5px;
  font-weight: 500;
  align-items: center;
  gap: 4px;
}

input:user-invalid,
select:user-invalid,
textarea:user-invalid {
  border-color: var(--color-error) !important;
  background-color: #FFF5F5;
}

input:user-invalid + .error-msg,
select:user-invalid + .error-msg,
textarea:user-invalid + .error-msg {
  display: flex;
}

input:required:user-valid,
select:required:user-valid,
textarea:required:user-valid {
  border-color: var(--color-success);
}

/* 1. Header (Sticky) */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
}

header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-light);
  height: 70px;
  border-bottom: 1px solid rgba(15, 30, 54, 0.05);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-text {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: #FFFFFF;
}

header.scrolled .logo-text {
  color: var(--color-primary);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 28px;
}

nav a {
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.8);
  position: relative;
  padding: 8px 0;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-gold-gradient);
  transition: width 0.3s ease;
}

nav a:hover {
  color: #FFFFFF;
}

nav a:hover::after {
  width: 100%;
}

header.scrolled nav a {
  color: var(--color-text-dark);
}

header.scrolled nav a:hover {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-phone {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #FFFFFF;
  font-family: var(--font-title);
  font-weight: 700;
}

header.scrolled .header-phone {
  color: var(--color-primary);
}

.header-btn {
  padding: 8px 16px;
  font-size: 0.9rem;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: #FFFFFF;
  font-size: 1.5rem;
  cursor: pointer;
}

header.scrolled .menu-toggle {
  color: var(--color-primary);
}

/* 2. Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: calc(var(--header-height) + 40px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: #FFFFFF;
}

.hero-video-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(15, 30, 54, 0.75) 0%, rgba(15, 30, 54, 0.45) 50%, rgba(15, 30, 54, 0.75) 100%);
  z-index: 2;
}

.hero .container {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
  width: 100%;
}

.hero-content {
  text-align: left;
}

.hero-badge {
  display: inline-block;
  background: rgba(212, 175, 55, 0.2);
  color: var(--color-accent-gold);
  border: 1px solid var(--color-accent-gold);
  padding: 6px 16px;
  border-radius: 50px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero h1 {
  color: #FFFFFF;
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 24px;
  line-height: 1.15;
}

.hero-sub {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 40px;
  border-left: 3px solid var(--color-accent-gold);
  padding-left: 20px;
}

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

/* Hero Fast Form Panel */
.hero-form-panel {
  border-radius: var(--radius-card);
  padding: 32px;
  text-align: center;
}

.hero-form-panel h3 {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.hero-form-panel p {
  font-size: 0.9rem;
  color: var(--color-text-gray);
  margin-bottom: 24px;
}

.hero-form-panel .btn {
  width: 100%;
  margin-top: 10px;
}

.form-trust-line {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--color-accent-gold);
  margin-top: 16px;
  font-weight: 600;
  font-family: var(--font-title);
}

/* 3. Section Vị trí vàng */
.location-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.map-wrapper {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-premium);
  border: 1px solid rgba(15, 30, 54, 0.08);
}

.map-wrapper img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.map-wrapper:hover img {
  transform: scale(1.03);
}

.location-info h3 {
  font-size: 1.8rem;
  margin-bottom: 24px;
}

.location-highlights {
  list-style: none;
  margin-bottom: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.location-highlights li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: var(--color-primary);
  font-family: var(--font-title);
}

.location-highlights svg {
  color: var(--color-accent-gold);
  flex-shrink: 0;
}

.distances-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.distance-card {
  background: var(--color-bg-light);
  padding: 20px 16px;
  border-radius: 12px;
  text-align: center;
  border: 1px solid rgba(15, 30, 54, 0.05);
  transition: all 0.3s ease;
}

.distance-card:hover {
  transform: translateY(-5px);
  background: #FFFFFF;
  box-shadow: var(--shadow-medium);
  border-color: var(--color-accent-gold);
}

.distance-val {
  font-family: var(--font-title);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.distance-label {
  font-size: 0.85rem;
  color: var(--color-text-gray);
  margin-top: 6px;
  font-weight: 500;
}

/* 4. Section Tiềm năng đầu tư (Split layout) */
.investment-split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-top: 40px;
}

.investment-media {
  position: sticky;
  top: 120px;
}

.media-container-premium {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-premium);
  border: 1px solid rgba(15, 30, 54, 0.08);
}

.media-container-premium img {
  width: 100%;
  height: 520px;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.media-container-premium:hover img {
  transform: scale(1.03);
}

.premium-badge-floating {
  position: absolute;
  top: 30px;
  left: 30px;
  padding: 16px 24px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  z-index: 5;
}

.badge-num {
  font-family: var(--font-title);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 4px;
}

.badge-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.premium-stats-floating {
  position: absolute;
  bottom: 30px;
  right: 30px;
  padding: 16px 24px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 5;
}

.stat-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #FFFFFF;
}

.stat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent-gold);
}

.investment-cards-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.investment-item-premium {
  display: flex;
  gap: 24px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(15, 30, 54, 0.08);
  transition: all 0.3s ease;
}

.investment-item-premium:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.item-number-serif {
  font-family: 'Playfair Display', 'Outfit', serif;
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  opacity: 0.7;
  transition: all 0.3s ease;
}

.item-content-premium h3 {
  font-size: 1.35rem;
  margin-bottom: 10px;
  transition: color 0.3s ease;
}

.item-content-premium p {
  font-size: 0.95rem;
  line-height: 1.6;
}

.investment-item-premium:hover .item-number-serif {
  opacity: 1;
  transform: translateY(-4px);
}

.investment-item-premium:hover .item-content-premium h3 {
  color: var(--color-accent-gold);
}

/* 5. Section Thư viện hình ảnh (Filters & Premium Grid) */
.gallery-filters {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 10px 24px;
  border-radius: 50px;
  border: 1px solid rgba(15, 30, 54, 0.1);
  background: #FFFFFF;
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-gray);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.filter-btn.active {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-medium);
}

.gallery-grid-premium {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.gallery-item-premium {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-light);
  cursor: pointer;
  aspect-ratio: 4 / 3;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* For animation trigger in JS filters */
.gallery-item-premium.hidden {
  display: none;
  opacity: 0;
  transform: scale(0.9);
}

.gallery-item-premium.wide {
  grid-column: span 2;
  aspect-ratio: 16 / 9;
}

.gallery-item-premium.tall {
  grid-row: span 2;
  aspect-ratio: 3 / 4;
}

.gallery-item-premium img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.gallery-overlay-premium {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(15, 30, 54, 0) 40%, rgba(15, 30, 54, 0.9) 100%);
  opacity: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 28px;
  transition: opacity 0.4s ease;
  z-index: 2;
}

.gallery-item-premium:hover img {
  transform: scale(1.08);
}

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

.gallery-meta {
  max-width: 80%;
  transform: translateY(15px);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.gallery-item-premium:hover .gallery-meta {
  transform: translateY(0);
}

.gallery-tag-premium {
  color: var(--color-accent-gold);
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 6px;
  display: block;
}

.gallery-title-premium {
  color: #FFFFFF;
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
}

.gallery-zoom-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transform: translateY(15px) scale(0.8);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.gallery-item-premium:hover .gallery-zoom-icon {
  transform: translateY(0) scale(1);
}

.gallery-zoom-icon:hover {
  background: var(--color-accent-gold-gradient);
  border-color: var(--color-accent-gold);
  color: #FFFFFF;
}

/* Lightbox Dialog Slider Navigation */
.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(15, 30, 54, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 100;
  transition: all 0.3s ease;
}

.lightbox-nav-btn:hover {
  background: var(--color-accent-gold-gradient);
  border-color: var(--color-accent-gold);
}

.lightbox-nav-btn.prev {
  left: 20px;
}

.lightbox-nav-btn.next {
  right: 20px;
}

/* Lightbox Dialog */
.lightbox-dialog {
  margin: auto;
  border: none;
  background: transparent;
  padding: 0;
  max-width: 90vw;
  max-height: 90vh;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  border-radius: var(--radius-card);
  overflow: hidden;
  outline: none;
}

.lightbox-dialog::backdrop {
  background-color: rgba(15, 30, 54, 0.92);
  backdrop-filter: blur(8px);
}

.lightbox-content {
  position: relative;
  display: flex;
  flex-direction: column;
}

.lightbox-content img {
  max-height: 80vh;
  width: auto;
  object-fit: contain;
}

.lightbox-caption {
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 16px 24px;
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.lightbox-close-btn {
  background: transparent;
  border: none;
  color: #FFFFFF;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s ease;
}

.lightbox-close-btn:hover {
  color: var(--color-accent-gold);
}

/* 6. Section Video */
.video-container {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-premium);
  aspect-ratio: 16 / 9;
  background: #000000;
}

.video-poster-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  cursor: pointer;
}

.video-poster-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.7);
  transition: transform 0.5s ease;
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90px;
  height: 90px;
  background: var(--color-accent-gold-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-gold), 0 0 0 10px rgba(212, 175, 55, 0.2);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  color: #FFFFFF;
}

.video-poster-wrapper:hover .video-play-btn {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: var(--shadow-gold), 0 0 0 15px rgba(212, 175, 55, 0.3);
}

.video-play-btn svg {
  margin-left: 4px;
}

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

/* 7. Section Tiện ích */
.amenities-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.amenity-card {
  padding: 30px 20px;
  text-align: center;
  border-radius: var(--radius-card);
  border: 1px solid rgba(15, 30, 54, 0.05);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.amenity-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-accent-gold);
  box-shadow: var(--shadow-medium);
  background: #FFFFFF;
}

.amenity-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 16px auto;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s ease;
}

.amenity-card:hover .amenity-icon {
  color: var(--color-accent-gold);
}

.amenity-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* 8. Section Mặt bằng căn hộ */
.floorplan-tabs-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.floorplan-tabs {
  display: flex;
  background: var(--color-bg-light);
  padding: 6px;
  border-radius: 50px;
  gap: 4px;
  margin-bottom: 48px;
  border: 1px solid rgba(15, 30, 54, 0.06);
}

.tab-btn {
  padding: 10px 24px;
  border-radius: 50px;
  border: none;
  background: transparent;
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-gray);
  cursor: pointer;
  transition: all 0.3s ease;
}

.tab-btn.active {
  background: var(--color-primary);
  color: #FFFFFF;
  box-shadow: var(--shadow-light);
}

.floorplan-content {
  width: 100%;
  display: none;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.floorplan-content.active {
  display: grid;
}

.floorplan-img-wrapper {
  background: var(--color-bg-light);
  border-radius: var(--radius-card);
  padding: 24px;
  border: 1px solid rgba(15, 30, 54, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 400px;
}

.floorplan-img-wrapper svg {
  max-height: 100%;
  width: auto;
}

.floorplan-info h3 {
  font-size: 2rem;
  margin-bottom: 12px;
}

.floorplan-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0 36px 0;
  border-top: 1px solid rgba(15, 30, 54, 0.08);
  border-bottom: 1px solid rgba(15, 30, 54, 0.08);
  padding: 24px 0;
}

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

.spec-label {
  font-size: 0.8rem;
  color: var(--color-text-gray);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.spec-val {
  font-family: var(--font-title);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 4px;
}

/* 9. Section Chính sách bán hàng */
.policy-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.policy-card {
  padding: 32px 24px;
  border-radius: var(--radius-card);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  border: 1px solid rgba(15, 30, 54, 0.06);
}

.policy-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-premium);
  border-color: var(--color-accent-gold);
}

.policy-card.highlighted {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-accent-gold);
  box-shadow: var(--shadow-gold);
}

.policy-card.highlighted h3 {
  color: #FFFFFF;
}

.policy-badge {
  font-family: var(--font-title);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-accent-gold);
  margin-bottom: 16px;
  display: block;
}

.policy-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.policy-card p {
  font-size: 0.9rem;
}

.policy-card.highlighted p {
  color: rgba(255, 255, 255, 0.8);
}

/* 10. Section Lý do nên đầu tư */
.timeline-container {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 0;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  width: 2px;
  height: 100%;
  background: rgba(15, 30, 54, 0.1);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 0 40px;
  margin-bottom: 40px;
}

.timeline-item:nth-child(even) {
  left: 50%;
}

.timeline-item:nth-child(odd) {
  left: 0;
  text-align: right;
}

.timeline-item::after {
  content: '';
  position: absolute;
  top: 10px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent-gold-gradient);
  border: 4px solid #FFFFFF;
  box-shadow: var(--shadow-light);
  z-index: 1;
}

.timeline-item:nth-child(odd)::after {
  right: -8px;
}

.timeline-item:nth-child(even)::after {
  left: -8px;
}

.timeline-item h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 0.95rem;
}

/* 11. Section Cảm nhận khách hàng */
.testimonial-slider {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.slider-wrapper {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide {
  min-width: 100%;
  padding: 24px;
}

.testimonial-card {
  text-align: center;
  padding: 40px;
  border-radius: var(--radius-card);
}

.customer-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 20px auto;
  border: 3px solid var(--color-accent-gold);
  box-shadow: var(--shadow-medium);
}

.rating-stars {
  color: var(--color-accent-gold);
  margin-bottom: 20px;
}

.testimonial-text {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 24px;
  line-height: 1.5;
}

.customer-name {
  font-weight: 700;
  font-family: var(--font-title);
  color: var(--color-primary);
  margin-bottom: 4px;
}

.customer-role {
  font-size: 0.85rem;
  color: var(--color-text-gray);
  font-weight: 500;
}

.slider-ctrl-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 1px solid rgba(15, 30, 54, 0.08);
  box-shadow: var(--shadow-light);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all 0.3s ease;
  color: var(--color-primary);
}

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

.slider-ctrl-btn.prev {
  left: 0;
}

.slider-ctrl-btn.next {
  right: 0;
}

/* 12. Section FAQ (Details Accordion) */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

details {
  border-radius: 12px;
  border: 1px solid rgba(15, 30, 54, 0.06);
  background: var(--color-bg-light);
  overflow: hidden;
  transition: all 0.3s ease;
}

details[open] {
  background: #FFFFFF;
  border-color: var(--color-accent-gold);
  box-shadow: var(--shadow-medium);
}

summary {
  padding: 20px 24px;
  list-style: none;
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--color-accent-gold);
  transition: transform 0.3s ease;
}

details[open] summary::after {
  content: '−';
}

.faq-answer {
  padding: 0 24px 24px 24px;
  font-size: 0.95rem;
  color: var(--color-text-gray);
  border-top: 1px solid rgba(15, 30, 54, 0.04);
  margin-top: 0;
}

/* 13. CTA Cuối trang & Liên hệ nhanh */
.footer-cta {
  background: linear-gradient(135deg, rgba(15, 30, 54, 0.97) 0%, rgba(15, 30, 54, 0.9) 100%), url('assets/images/hero_poster.png');
  background-size: cover;
  background-position: center;
  color: #FFFFFF;
  text-align: center;
  padding: 100px 0 80px 0;
}

.footer-cta-container {
  max-width: 650px;
  margin: 0 auto;
}

.footer-cta h2 {
  color: #FFFFFF;
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.footer-cta p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 40px;
}

.footer-cta-form {
  margin-bottom: 48px;
}

.footer-cta-form .form-group label {
  color: #FFFFFF;
}

.hotline-highlight {
  font-family: var(--font-title);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-accent-gold);
  margin-bottom: 24px;
}

.contact-quick-links {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.quick-contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: 50px;
  font-family: var(--font-title);
  font-weight: 600;
  color: #FFFFFF;
  transition: all 0.3s ease;
}

.quick-contact-btn.call { background: var(--color-accent-gold); }
.quick-contact-btn.zalo { background: #0068FF; }
.quick-contact-btn.messenger { background: #0084FF; }

.quick-contact-btn:hover {
  transform: translateY(-3px);
  filter: brightness(1.1);
}

/* 14. Footer */
footer {
  background: #0A1424;
  padding: 60px 0 30px 0;
  color: rgba(255, 255, 255, 0.6);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-info h3 {
  color: #FFFFFF;
  font-size: 1.25rem;
  margin-bottom: 20px;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a:hover {
  color: var(--color-accent-gold);
}

.social-links {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.social-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
}

.social-btn:hover {
  background: var(--color-accent-gold);
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
}

/* Floating Widgets */
.floating-widgets {
  position: fixed;
  bottom: 32px;
  right: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  z-index: 999;
}

.floating-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  box-shadow: var(--shadow-premium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.floating-btn:hover {
  transform: scale(1.1) translateY(-2px);
}

.floating-btn.hotline {
  background: var(--color-accent-gold);
  box-shadow: 0 0 0 0 rgba(212, 175, 55, 0.6);
  animation: pulseGold 2s infinite;
}

.floating-btn.zalo {
  background: #0068FF;
}

.floating-btn.messenger {
  background: #0084FF;
}

.floating-tooltip {
  position: absolute;
  right: 72px;
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-title);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  box-shadow: var(--shadow-light);
}

.floating-btn:hover .floating-tooltip {
  opacity: 1;
}

@keyframes pulseGold {
  0% {
    box-shadow: 0 0 0 0 rgba(212, 175, 55, 0.7);
  }
  70% {
    box-shadow: 0 0 0 15px rgba(212, 175, 55, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(212, 175, 55, 0);
  }
}

/* Scroll-Sticky Bottom Mobile CTA */
.sticky-mobile-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  padding: 12px 24px;
  box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.05);
  z-index: 998;
  border-top: 1px solid rgba(15, 30, 54, 0.06);
}

.sticky-mobile-cta .btn {
  width: 100%;
}

/* Animations Scroll Reveal */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-up.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
    padding-top: 40px;
  }
  
  .hero-content {
    text-align: center;
  }
  
  .hero-sub {
    border-left: none;
    border-top: 2px solid var(--color-accent-gold);
    padding-left: 0;
    padding-top: 16px;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .location-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .investment-split-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .investment-media {
    position: relative;
    top: 0;
  }
  
  .media-container-premium img {
    height: 400px;
  }
  
  .gallery-grid-premium {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .amenities-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .policy-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: var(--section-padding-mobile);
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  header {
    height: 70px;
    background: rgba(15, 30, 54, 0.95);
  }
  
  header.scrolled {
    height: 60px;
  }
  
  .logo-text {
    font-size: 1.25rem;
  }
  
  nav {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: var(--color-primary);
    transition: left 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 999;
    padding: 40px 24px;
    overflow-y: auto;
  }
  
  nav.active {
    left: 0;
  }
  
  nav ul {
    flex-direction: column;
    gap: 24px;
    align-items: center;
  }
  
  nav a {
    font-size: 1.2rem;
    color: #FFFFFF;
  }
  
  .header-actions {
    display: none;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .distances-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .investment-split-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .investment-media {
    position: relative;
    top: 0;
  }
  
  .media-container-premium img {
    height: 300px;
  }
  
  .gallery-grid-premium {
    grid-template-columns: 1fr;
  }
  
  .gallery-item-premium.wide {
    grid-column: span 1;
    aspect-ratio: 4 / 3;
  }
  
  .gallery-item-premium.tall {
    grid-row: span 1;
    aspect-ratio: 4 / 3;
  }
  
  .amenities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .floorplan-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .floorplan-img-wrapper {
    height: 280px;
  }
  
  .policy-grid {
    grid-template-columns: 1fr;
  }
  
  .timeline-line {
    left: 16px;
  }
  
  .timeline-item {
    width: 100%;
    padding-left: 36px;
    padding-right: 0;
    text-align: left !important;
  }
  
  .timeline-item:nth-child(even) {
    left: 0;
  }
  
  .timeline-item::after {
    left: 8px !important;
    right: auto !important;
  }
  
  .footer-cta h2 {
    font-size: 1.8rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .floating-widgets {
    bottom: 84px; /* Offset for sticky mobile CTA */
    right: 16px;
  }
  
  .sticky-mobile-cta {
    display: block;
  }
}