/* ============================================================
   Vietnam Open Tour – Refined Visual System
   ============================================================ */

:root {
  --brand-50: #f0f9ff;
  --brand-100: #e0f2fe;
  --brand-500: #0ea5e9;
  --brand-600: #0284c7;
  --brand-700: #0369a1;
  --brand-800: #075985;
  --brand-900: #0c4a6e;
  --accent-400: #fbbf24;
  --accent-500: #f59e0b;
  --accent-600: #d97706;
  --surface: #ffffff;
  --surface-muted: #f8fafc;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --radius: 1rem;
  --radius-lg: 1.25rem;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.04);
  --shadow: 0 4px 20px -4px rgb(15 23 42 / 0.08);
  --shadow-lg: 0 12px 40px -12px rgb(15 23 42 / 0.14);
  --shadow-xl: 0 24px 48px -16px rgb(15 23 42 / 0.18);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Base polish ---------- */
body {
  background-color: #f1f5f9;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgb(14 165 233 / 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgb(245 158 11 / 0.05), transparent);
  min-height: 100vh;
}

::selection {
  background: rgb(14 165 233 / 0.25);
  color: var(--brand-900);
}

/* Smooth focus rings */
input:focus, textarea:focus, select:focus, button:focus-visible {
  outline: none;
}

/* ---------- Hero ---------- */
.hero-gradient {
  background:
    linear-gradient(145deg, #0a3d5c 0%, #0c4a6e 25%, #0369a1 55%, #0ea5e9 100%);
  position: relative;
}

.hero-gradient::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 20% 80%, rgb(245 158 11 / 0.15), transparent 50%),
    radial-gradient(ellipse 50% 40% at 90% 20%, rgb(255 255 255 / 0.08), transparent);
  pointer-events: none;
}

.hero-mesh {
  background-image:
    linear-gradient(145deg, rgb(12 74 110 / 0.92) 0%, rgb(3 105 161 / 0.88) 50%, rgb(14 165 233 / 0.85) 100%),
    url('https://images.unsplash.com/photo-1528127269322-539801943592?w=1600&q=80');
  background-size: cover;
  background-position: center;
}

/* ---------- Cards ---------- */
.card-hover {
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.25s ease;
  border: 1px solid rgb(226 232 240 / 0.8);
  box-shadow: var(--shadow-sm);
}

.card-hover:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: rgb(14 165 233 / 0.25);
}

.tour-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

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

.tour-card .card-img-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.tour-card .card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

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

.tour-card .card-img-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgb(15 23 42 / 0.45) 0%, transparent 50%);
  opacity: 0.6;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.tour-card:hover .card-img-wrap::after {
  opacity: 0.35;
}

/* ---------- Badges ---------- */
.price-badge {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  box-shadow: 0 4px 14px -2px rgb(217 119 6 / 0.45);
  letter-spacing: 0.01em;
}

.badge-glass {
  background: rgb(255 255 255 / 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px rgb(0 0 0 / 0.08);
}

.badge-duration {
  background: rgb(255 255 255 / 0.95);
  backdrop-filter: blur(6px);
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #334155;
  padding: 0.35rem 0.65rem;
  border-radius: 0.5rem;
  box-shadow: 0 2px 6px rgb(0 0 0 / 0.1);
}

/* ---------- Buttons ---------- */
.btn-primary {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: white;
  font-weight: 600;
  border-radius: 0.75rem;
  padding: 0.75rem 1.5rem;
  box-shadow: 0 4px 16px -2px rgb(217 119 6 / 0.4);
  transition: all 0.25s var(--ease);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -4px rgb(217 119 6 / 0.5);
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
}

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

.btn-brand {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: white;
  font-weight: 600;
  border-radius: 0.75rem;
  padding: 0.75rem 1.5rem;
  box-shadow: 0 4px 16px -2px rgb(3 105 161 / 0.35);
  transition: all 0.25s var(--ease);
}

.btn-brand:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -4px rgb(3 105 161 / 0.45);
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
}

.btn-ghost {
  background: rgb(255 255 255 / 0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgb(255 255 255 / 0.25);
  color: white;
  font-weight: 600;
  border-radius: 0.75rem;
  padding: 0.75rem 1.5rem;
  transition: all 0.25s var(--ease);
}

.btn-ghost:hover {
  background: rgb(255 255 255 / 0.22);
  border-color: rgb(255 255 255 / 0.4);
}

.btn-outline {
  background: white;
  border: 1.5px solid var(--border);
  color: var(--brand-700);
  font-weight: 600;
  border-radius: 0.75rem;
  padding: 0.5rem 1rem;
  transition: all 0.2s ease;
}

.btn-outline:hover {
  border-color: var(--brand-400);
  background: var(--brand-50);
  color: var(--brand-800);
}

/* ---------- Nav ---------- */
.nav-link {
  position: relative;
  padding: 0.5rem 1rem;
  border-radius: 0.625rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #475569;
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover {
  color: var(--brand-700);
  background: var(--brand-50);
}

.nav-link.active {
  color: var(--brand-700);
  background: var(--brand-50);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1.25rem;
  height: 2px;
  background: var(--brand-500);
  border-radius: 1px;
}

/* Logo mark — brand emblem */
.logo-mark {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: transparent;
  flex-shrink: 0;
  box-shadow: 0 2px 10px -2px rgb(185 28 28 / 0.35);
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
}
.logo-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.logo-mark--sm {
  width: 2.25rem;
  height: 2.25rem;
}
.logo-mark:hover,
a:hover .logo-mark {
  transform: scale(1.06);
  box-shadow: 0 4px 14px -2px rgb(185 28 28 / 0.45);
}

/* ---------- Category icon cards (homepage) ---------- */
.cat-icon-card {
  background: white;
  border-radius: var(--radius);
  padding: 1.25rem;
  border: 1px solid rgb(226 232 240 / 0.9);
  box-shadow: var(--shadow);
  transition: all 0.3s var(--ease);
}

.cat-icon-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgb(14 165 233 / 0.3);
}

.cat-icon-card .icon-wrap {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.75rem;
  background: linear-gradient(145deg, #e0f2fe, #bae6fd);
  color: var(--brand-600);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s var(--ease);
}

.cat-icon-card:hover .icon-wrap {
  background: linear-gradient(145deg, #0ea5e9, #0284c7);
  color: white;
  transform: scale(1.08);
}

/* ---------- Booking sticky card ---------- */
.booking-card {
  background: white;
  border-radius: 1.25rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.booking-card-header {
  background: linear-gradient(145deg, #0c4a6e 0%, #0369a1 100%);
  color: white;
  padding: 1.25rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.booking-card-header::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgb(255 255 255 / 0.1), transparent 70%);
  pointer-events: none;
}

/* Option radio cards */
.option-card {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border-radius: 0.875rem;
  border: 2px solid #e2e8f0;
  cursor: pointer;
  transition: all 0.2s ease;
  background: white;
}

.option-card:hover {
  border-color: #7dd3fc;
  background: #f0f9ff;
}

.option-card.selected,
.option-card:has(input:checked) {
  border-color: #0ea5e9;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  box-shadow: 0 0 0 3px rgb(14 165 233 / 0.15);
}

/* ---------- Forms ---------- */
.form-input {
  width: 100%;
  padding: 0.7rem 1rem;
  border-radius: 0.75rem;
  border: 1.5px solid #e2e8f0;
  background: #f8fafc;
  font-size: 0.9375rem;
  transition: all 0.2s ease;
}

.form-input:hover {
  border-color: #cbd5e1;
  background: white;
}

.form-input:focus {
  border-color: #0ea5e9;
  background: white;
  box-shadow: 0 0 0 3px rgb(14 165 233 / 0.15);
}

/* ---------- Prose / content ---------- */
.prose-tour {
  line-height: 1.75;
  color: #475569;
}

.prose-tour h2,
.prose-tour h3 {
  color: #0c4a6e;
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 700;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.prose-tour p {
  margin-bottom: 0.85em;
}

.prose-tour ul {
  list-style: none;
  padding-left: 0;
}

.prose-tour ul li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.4rem;
}

.prose-tour ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--brand-500);
}

.prose-tour strong {
  color: #1e293b;
}

.prose-tour a {
  color: var(--brand-600);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose-tour a:hover {
  color: var(--brand-800);
}

/* Content sections */
.content-block {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow-sm);
}

.content-block h2 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--brand-900);
  margin-bottom: 1rem;
}

/* ---------- Page headers ---------- */
.page-hero {
  background: linear-gradient(145deg, #0c4a6e 0%, #0369a1 60%, #0ea5e9 100%);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 80% at 0% 50%, rgb(245 158 11 / 0.12), transparent),
    radial-gradient(ellipse 40% 60% at 100% 0%, rgb(255 255 255 / 0.08), transparent);
  pointer-events: none;
}

/* ---------- Why-us icons ---------- */
.feature-icon {
  width: 3.5rem;
  height: 3.5rem;
  margin: 0 auto 1rem;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  transition: transform 0.3s var(--ease);
}

.feature-icon:hover,
.group:hover .feature-icon {
  transform: scale(1.1) rotate(-4deg);
}

/* ---------- Footer ---------- */
.footer-link {
  color: #94a3b8;
  transition: color 0.2s ease, transform 0.2s;
  display: inline-block;
}

.footer-link:hover {
  color: white;
  transform: translateX(3px);
}

.social-btn {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.625rem;
  background: rgb(255 255 255 / 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s var(--ease);
}

.social-btn:hover {
  background: var(--brand-500);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgb(14 165 233 / 0.35);
}

/* ---------- Cart badge ---------- */
#cart-count {
  transition: transform 0.2s var(--ease);
  box-shadow: 0 2px 6px rgb(217 119 6 / 0.4);
}

#cart-count.bump {
  transform: scale(1.35);
}

/* ---------- Toast ---------- */
#vot-toast {
  backdrop-filter: blur(8px);
  box-shadow: 0 10px 40px -8px rgb(0 0 0 / 0.25);
}

/* ---------- Qty controls ---------- */
.qty-control {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: #f8fafc;
  border: 1.5px solid #e2e8f0;
  border-radius: 0.75rem;
  padding: 0.15rem;
}

.qty-control button {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  border: none;
  background: white;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.05);
}

.qty-control button:hover {
  background: var(--brand-50);
  color: var(--brand-700);
}

.qty-control input,
.qty-control span {
  width: 2rem;
  text-align: center;
  font-weight: 600;
  font-size: 0.875rem;
  border: none;
  background: transparent;
}

/* ---------- Section titles ---------- */
.section-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 700;
  color: var(--brand-900);
  letter-spacing: -0.02em;
}

/* ---------- Divider glow ---------- */
.divider-glow {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgb(14 165 233 / 0.3), transparent);
  border: none;
}

/* ---------- Line clamp helper ---------- */
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- Scrollbar (webkit) ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* ---------- Subtle entrance animation ---------- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-up {
  animation: fadeUp 0.5s var(--ease) both;
}

.animate-delay-1 { animation-delay: 0.08s; }
.animate-delay-2 { animation-delay: 0.16s; }
.animate-delay-3 { animation-delay: 0.24s; }
.animate-delay-4 { animation-delay: 0.32s; }