/* ==========================================================================
   VỊ TRÍ LÔ ĐẤT - MODERN LANDING PAGE, TERMS & PRIVACY STYLESHEET
   Design System: Apple iOS / Modern Glassmorphism Clean Aesthetic
   ========================================================================== */

:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --primary-gradient: linear-gradient(135deg, #0284c7 0%, #06b6d4 50%, #3b82f6 100%);
  --accent: #10b981;
  --accent-light: #d1fae5;
  --dark-bg: #090d16;
  --dark-card: #131b2e;
  --dark-border: rgba(255, 255, 255, 0.08);
  --light-bg: #f8fafc;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 35px -5px rgba(2, 132, 199, 0.35);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  scroll-behavior: smooth;
  color: var(--text-main);
  background-color: var(--light-bg);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   NAVBAR
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.25);
  object-fit: cover;
}

.brand-text-wrap {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
  line-height: 1.2;
}

.brand-subtitle {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

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

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff !important;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main) !important;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

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

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 60px 0 80px;
  overflow: hidden;
  background: radial-gradient(circle at 50% 10%, rgba(2, 132, 199, 0.08) 0%, transparent 60%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 48px;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(2, 132, 199, 0.1);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 20px;
  border: 1px solid rgba(2, 132, 199, 0.2);
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent);
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 20px;
}

.text-gradient {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 32px;
  max-width: 560px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--card-border);
}

.stat-item h4 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-image-card {
  position: relative;
  border-radius: var(--radius-xl);
  padding: 12px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border: 1px solid rgba(255, 255, 255, 0.6);
  transition: transform 0.4s ease;
  max-width: 440px;
}

.hero-image-card:hover {
  transform: translateY(-6px) scale(1.01);
}

.hero-image-card img {
  border-radius: var(--radius-lg);
  width: 100%;
  display: block;
  object-fit: cover;
}

.floating-tag {
  position: absolute;
  background: rgba(15, 23, 42, 0.88);
  color: #ffffff;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 600;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  animation: float 4s ease-in-out infinite;
}

.tag-top-left {
  top: 40px;
  left: -20px;
}

.tag-bottom-right {
  bottom: 50px;
  right: -20px;
  animation-delay: 2s;
}

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

/* ==========================================================================
   SECTION COMMON
   ========================================================================== */
section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 16px;
}

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

/* ==========================================================================
   FEATURES GRID
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(2, 132, 199, 0.4);
}

.feature-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   SCREENSHOTS SHOWCASE
   ========================================================================== */
.screenshots-section {
  background: #f1f5f9;
}

.gallery-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 24px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
}

.tab-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.gallery-pane {
  display: none;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.gallery-pane.active {
  display: grid;
}

.screen-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.screen-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.screen-img-box {
  background: #0f172a;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

.screen-img-box img {
  border-radius: var(--radius-sm);
  transition: transform 0.4s ease;
  max-height: 480px;
  object-fit: contain;
}

.screen-card:hover .screen-img-box img {
  transform: scale(1.03);
}

.screen-info {
  padding: 20px 24px;
}

.screen-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.screen-info h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.screen-info p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ==========================================================================
   TECHNICAL STANDARD & HIGHLIGHT BANNER
   ========================================================================== */
.standard-box {
  background: #ffffff;
  border-radius: var(--radius-xl);
  border: 1px solid var(--card-border);
  padding: 44px 40px;
  box-shadow: var(--shadow-md);
  margin-top: 24px;
}

.standard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.standard-col h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.standard-list {
  list-style: none;
}

.standard-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 14px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.standard-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ==========================================================================
   FAQ ACCORDION
   ========================================================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

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

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--primary);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.faq-item.active .faq-answer {
  padding: 0 24px 20px 24px;
}

/* ==========================================================================
   CALL TO ACTION BANNER
   ========================================================================== */
.cta-banner {
  background: linear-gradient(135deg, #090d16 0%, #1e293b 100%);
  color: #ffffff;
  border-radius: var(--radius-xl);
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.cta-banner h2 {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-banner p {
  font-size: 1.1rem;
  color: #94a3b8;
  max-width: 620px;
  margin: 0 auto 32px;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ==========================================================================
   LEGAL PAGES (TERMS & PRIVACY)
   ========================================================================== */
.legal-header {
  padding: 50px 0 30px;
  background: #f1f5f9;
  border-bottom: 1px solid var(--card-border);
}

.legal-header .badge-pill {
  margin-bottom: 12px;
}

.legal-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}

.legal-meta {
  display: flex;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.legal-body {
  padding: 50px 0 80px;
}

.legal-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

.legal-sidebar {
  position: sticky;
  top: 96px;
  background: #ffffff;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.sidebar-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-list a {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: block;
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 8px;
}

.toc-list a:hover {
  color: var(--primary);
  border-left-color: var(--primary);
}

.legal-content {
  background: #ffffff;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-sm);
}

.legal-article h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 36px 0 16px;
  padding-top: 16px;
  border-top: 1px solid var(--card-border);
}

.legal-article h2:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.legal-article h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 20px 0 10px;
}

.legal-article p {
  font-size: 0.98rem;
  line-height: 1.7;
  color: #334155;
  margin-bottom: 16px;
}

.legal-article ul, .legal-article ol {
  margin: 0 0 20px 24px;
}

.legal-article li {
  font-size: 0.98rem;
  line-height: 1.65;
  color: #334155;
  margin-bottom: 8px;
}

.legal-notice {
  background: #eff6ff;
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 0.95rem;
  color: #1e3a8a;
}

.legal-warning {
  background: #fffbeb;
  border-left: 4px solid #f59e0b;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 0.95rem;
  color: #92400e;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background: #090d16;
  color: #cbd5e1;
  padding: 60px 0 30px;
  margin-top: auto;
  border-top: 1px solid #1e293b;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: #94a3b8;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 0.88rem;
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 0.9rem;
  color: #94a3b8;
}

.footer-col a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #1e293b;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #64748b;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

/* ==========================================================================
   LIGHTBOX MODAL
   ========================================================================== */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(10, 15, 29, 0.92);
  backdrop-filter: blur(12px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lightbox-modal.show {
  display: flex;
  opacity: 1;
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 82vh;
  border-radius: var(--radius-md);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  object-fit: contain;
}

.lightbox-caption {
  margin-top: 14px;
  color: #f1f5f9;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: -44px;
  right: 0;
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  border: none;
  font-size: 1.5rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    margin: 0 auto 32px;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .tag-top-left {
    left: 10px;
  }

  .tag-bottom-right {
    right: 10px;
  }

  .standard-grid {
    grid-template-columns: 1fr;
  }

  .legal-grid {
    grid-template-columns: 1fr;
  }

  .legal-sidebar {
    position: static;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .legal-content {
    padding: 24px 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* Mobile Navigation Dropdown */
.mobile-nav-panel {
  display: none;
  padding: 16px 24px 24px;
  background: #ffffff;
  border-bottom: 1px solid var(--card-border);
}

.mobile-nav-panel.open {
  display: block;
}

.mobile-nav-panel a {
  display: block;
  padding: 12px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  border-bottom: 1px solid #f1f5f9;
}