/* ============================================
   Tình Trạng Sài Gòn Hôm Nay
   Static site styles
   ============================================ */

/* --- CSS Variables --- */
:root {
  --color-primary: #c0392b;
  --color-primary-dark: #962d22;
  --color-secondary: #f39c12;
  --color-accent: #2c3e50;
  --color-text: #333;
  --color-text-light: #666;
  --color-text-muted: #999;
  --color-bg: #fff;
  --color-bg-alt: #faf8f5;
  --color-bg-dark: #1a1a2e;
  --color-border: #e8e0d8;
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1200px;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
  --transition: 0.3s ease;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

img, svg {
  max-width: 100%;
  display: block;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  padding: 20px 0;
  transition: all var(--transition);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.97);
  padding: 12px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(10px);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color var(--transition);
}

.navbar.scrolled .nav-logo {
  color: var(--color-primary);
}

.logo-icon {
  font-size: 1.2em;
  color: var(--color-secondary);
}

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

.nav-link {
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-radius: 6px;
  transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.15);
}

.navbar.scrolled .nav-link {
  color: var(--color-text-light);
}

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
  color: var(--color-primary);
  background: rgba(192, 57, 43, 0.08);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  transition: all var(--transition);
}

.navbar.scrolled .nav-toggle span {
  background: var(--color-text);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(26, 26, 46, 0.7), rgba(192, 57, 43, 0.4)),
    linear-gradient(45deg, #1a1a2e 0%, #c0392b 50%, #f39c12 100%);
  background-size: cover;
  color: #fff;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(243, 156, 18, 0.15) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 50%, rgba(192, 57, 43, 0.1) 0%, transparent 50%);
  animation: heroFloat 20s ease-in-out infinite;
}

@keyframes heroFloat {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(2%, -2%) rotate(1deg); }
  66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: url('images/hero-pattern.svg') repeat;
  opacity: 0.05;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 0 24px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero-subtitle {
  display: block;
  font-size: 0.3em;
  font-family: var(--font-body);
  font-weight: 300;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  opacity: 0.8;
  margin: 8px 0;
}

.hero-description {
  font-size: 1.15rem;
  line-height: 1.8;
  opacity: 0.9;
  margin-bottom: 40px;
  max-width: 550px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btn {
  display: inline-block;
  padding: 16px 40px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  border-radius: 50px;
  transition: all var(--transition);
  border: 2px solid transparent;
}

.hero-btn:hover {
  background: transparent;
  border-color: #fff;
  transform: translateY(-2px);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  z-index: 2;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid rgba(255, 255, 255, 0.5);
  border-bottom: 2px solid rgba(255, 255, 255, 0.5);
  transform: rotate(45deg);
  margin: 10px auto 0;
  animation: scrollBounce 2s ease infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 0.5; }
  50% { transform: rotate(45deg) translate(5px, 5px); opacity: 1; }
}

/* --- Sections --- */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 20px;
  background: rgba(192, 57, 43, 0.08);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 50px;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-description {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* --- About Section --- */
.about {
  background: var(--color-bg-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--color-bg);
  padding: 40px 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: all var(--transition);
}

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

.about-icon {
  color: var(--color-primary);
  margin-bottom: 20px;
}

.about-card h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--color-accent);
}

.about-card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* --- Landmarks Section --- */
.landmarks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 30px;
}

.landmark-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

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

.landmark-featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.landmark-image {
  height: 220px;
  background: linear-gradient(135deg, #e8d5b7, #d4a574);
  background-size: cover;
  background-position: center;
  position: relative;
}

.landmark-featured .landmark-image {
  height: 100%;
  min-height: 300px;
}

.landmark-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 4px 14px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 50px;
}

.landmark-content {
  padding: 24px;
}

.landmark-content h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.landmark-content p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.landmark-meta {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* --- Cuisine Section --- */
.cuisine {
  background: var(--color-bg-alt);
}

.cuisine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.cuisine-card {
  background: var(--color-bg);
  padding: 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.cuisine-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transition: transform var(--transition);
}

.cuisine-card:hover::before {
  transform: scaleX(1);
}

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

.cuisine-emoji {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.cuisine-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.cuisine-card p {
  color: var(--color-text-light);
  font-size: 0.93rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.cuisine-price {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(192, 57, 43, 0.08);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 50px;
}

/* --- Culture Section --- */
.culture-timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto 60px;
  padding-left: 40px;
}

.culture-timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary));
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -33px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 3px var(--color-primary);
}

.timeline-content {
  background: var(--color-bg-alt);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.timeline-content h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.timeline-content p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Facts */
.culture-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  text-align: center;
}

.fact-card {
  padding: 32px 20px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.fact-number {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.fact-label {
  color: var(--color-text-light);
  font-size: 0.95rem;
  font-weight: 500;
}

/* --- Gallery Section --- */
.gallery {
  background: var(--color-bg-alt);
}

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

.filter-btn {
  padding: 10px 24px;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--color-bg);
}

.gallery-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.gallery-item.hidden {
  display: none;
}

.gallery-placeholder {
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.placeholder-svg {
  width: 100%;
  height: 100%;
}

.gallery-caption {
  padding: 16px 20px;
  font-weight: 500;
  color: var(--color-accent);
  font-size: 0.95rem;
  border-top: 1px solid var(--color-border);
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 40px;
  align-items: start;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 28px;
}

.contact-icon {
  font-size: 1.5rem;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(192, 57, 43, 0.08);
  border-radius: 12px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 1rem;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.contact-item p {
  color: var(--color-text-light);
  font-size: 0.93rem;
}

.contact-form {
  background: var(--color-bg-alt);
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.submit-btn {
  width: 100%;
  padding: 16px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--transition);
}

.submit-btn:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(192, 57, 43, 0.3);
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 30px;
}

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

.footer-about h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 12px;
}

.footer-about p {
  font-size: 0.93rem;
  line-height: 1.7;
}

.footer-links h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 16px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 0.93rem;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.3rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(192, 57, 43, 0.3);
  z-index: 999;
}

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

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

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* --- Responsive --- */
@media (max-width: 968px) {
  .landmark-featured {
    grid-template-columns: 1fr;
  }

  .landmark-featured .landmark-image {
    min-height: 220px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-bg);
    flex-direction: column;
    padding: 80px 30px 30px;
    gap: 4px;
    transition: right var(--transition);
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.1);
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-menu .nav-link {
    color: var(--color-text);
    padding: 12px 16px;
    width: 100%;
    font-size: 1rem;
  }

  .nav-menu .nav-link:hover,
  .nav-menu .nav-link.active {
    color: var(--color-primary);
    background: rgba(192, 57, 43, 0.08);
  }

  .section {
    padding: 60px 0;
  }

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

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

  .culture-facts {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-title {
    font-size: 3rem;
  }
}

@media (max-width: 480px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

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

  .culture-facts {
    grid-template-columns: 1fr;
  }

  .gallery-filter {
    gap: 8px;
  }

  .filter-btn {
    padding: 8px 16px;
    font-size: 0.85rem;
  }
}