/* ============================================================
   VETAUDULICHHALONG.COM — DESIGN SYSTEM CSS
   "Ocean Luxury" — Cream/White + Gold Accent + Navy
   Light luxury resort aesthetic (Silversea / SeaDream reference)
   Research-based: Baymard Institute + 9 competitor sites
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif:ital,wght@0,400;0,600;0,700;1,400;1,600&family=Jost:wght@300;400;500;600;700&display=swap');

/* ─── COLOR TOKENS ─── */
:root {
  /* Dark navy: USED ONLY for text/headings (never as a section background) */
  --c-midnight:    #1A2332;
  --c-navy:        #2A3F66;
  --c-ocean:       #4A6B8A;

  /* Gold — main accent (refined warm) */
  --c-gold:        #B8860B;
  --c-gold-light:  #C9A961;
  --c-gold-dark:   #8B6914;
  --c-gold-pale:   #FAF0D5;
  --c-gold-shine:  linear-gradient(135deg, #B8860B 0%, #D4A845 50%, #B8860B 100%);

  --c-burgundy:    #8B4513;
  --c-cream:       #FAF6EF;
  --c-ivory:       #FAF7F2;
  --c-sand:        #F0E6D2;

  --c-bg:          #FAF7F2;    /* Page = ivory */
  --c-surface:     #FFFFFF;
  --c-border:      #E6DFD0;
  --c-text:        #1A2332;
  --c-text-2:      #4A5568;
  --c-muted:       #6B7280;
  --c-placeholder: #9CA3AF;

  --c-success:     #10B981;
  --c-warning:     #F59E0B;
  --c-error:       #EF4444;
  --c-discount:    #DC2626;

  /* ─── TYPOGRAPHY ─── */
  --font-display:  'Noto Serif', Georgia, serif;
  --font-body:     'Jost', system-ui, -apple-system, sans-serif;

  --t-hero:  clamp(2.4rem, 5vw, 4.5rem);
  --t-h1:    clamp(1.875rem, 3.5vw, 3rem);
  --t-h2:    clamp(1.5rem, 2.5vw, 2.25rem);
  --t-h3:    clamp(1.2rem, 1.8vw, 1.625rem);
  --t-h4:    1.25rem;
  --t-body:  1rem;
  --t-sm:    0.875rem;
  --t-xs:    0.75rem;
  --t-price: clamp(1.375rem, 2vw, 1.875rem);

  /* ─── SPACING ─── */
  --sp-1: 4px;   --sp-2: 8px;   --sp-3: 12px;  --sp-4: 16px;
  --sp-5: 20px;  --sp-6: 24px;  --sp-8: 32px;  --sp-10: 40px;
  --sp-12: 48px; --sp-16: 64px; --sp-20: 80px; --sp-24: 96px;

  /* ─── LAYOUT ─── */
  --max-w:    1440px;
  --max-w-md: 1200px;
  --gutter:   clamp(1rem, 4vw, 2rem);
  --grid-gap: 1.5rem;

  /* ─── SHADOWS ─── */
  --shadow-sm:   0 1px 3px rgba(12,27,51,0.08), 0 1px 2px rgba(12,27,51,0.06);
  --shadow-md:   0 4px 16px rgba(12,27,51,0.10), 0 2px 8px rgba(12,27,51,0.06);
  --shadow-lg:   0 10px 32px rgba(12,27,51,0.14), 0 4px 16px rgba(12,27,51,0.08);
  --shadow-xl:   0 20px 60px rgba(12,27,51,0.18), 0 8px 24px rgba(12,27,51,0.10);
  --shadow-gold: 0 4px 24px rgba(202,138,4,0.35), 0 2px 8px rgba(202,138,4,0.20);

  /* ─── RADIUS ─── */
  --r-sm:   6px;
  --r-md:   12px;
  --r-lg:   16px;
  --r-xl:   20px;
  --r-full: 999px;

  /* ─── TRANSITIONS ─── */
  --ease-out:   cubic-bezier(0.0, 0.0, 0.2, 1);
  --ease-in:    cubic-bezier(0.4, 0.0, 1, 1);
  --ease-inout: cubic-bezier(0.4, 0.0, 0.2, 1);
  --dur-fast:   150ms;
  --dur-base:   250ms;
  --dur-slow:   350ms;

  /* ─── Z-INDEX ─── */
  --z-sticky: 100;
  --z-header: 200;
  --z-dropdown: 300;
  --z-modal:  1000;
  --z-toast:  1100;
}

/* ─── RESET ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; }
body {
  font-family: var(--font-body);
  font-size: var(--t-body);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;       /* prevent horizontal scroll caused by hero decoratives */
}
body > * { max-width: 100vw; }
img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
ul { list-style: none; }
input, select, textarea { font-family: inherit; font-size: 16px; }

/* ─── LAYOUT UTILITIES ─── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-width: 0;
}
.container--md { max-width: var(--max-w-md); }
.container--narrow { max-width: 900px; }

/* ─── TYPOGRAPHY ─── */
.display { font-family: var(--font-display); font-weight: 700; line-height: 1.1; letter-spacing: -0.02em; }
.serif   { font-family: var(--font-display); }
h1,h2,h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.2; }
h4,h5,h6 { font-family: var(--font-body); font-weight: 600; }

.section-label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: var(--sp-3);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--t-h2);
  font-weight: 700;
  color: var(--c-midnight);
  line-height: 1.2;
  margin-bottom: var(--sp-4);
}
.section-subtitle {
  font-size: 1.0625rem;
  color: var(--c-muted);
  max-width: 560px;
  line-height: 1.7;
}

/* ─── BUTTONS ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0 var(--sp-8);
  height: 48px;
  border-radius: var(--r-full);
  font-family: var(--font-body);
  font-size: var(--t-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all var(--dur-base) var(--ease-out);
  white-space: nowrap;
}
.btn--primary {
  background: linear-gradient(135deg, #CA8A04, #D4AF37);
  color: #0C0A09;
  box-shadow: var(--shadow-gold);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(202,138,4,0.45);
}
.btn--primary:active { transform: translateY(0); }

.btn--outline-gold {
  border: 2px solid var(--c-gold);
  color: var(--c-gold);
  background: transparent;
}
.btn--outline-gold:hover {
  background: var(--c-gold);
  color: #0C0A09;
}
.btn--outline-white {
  border: 2px solid rgba(255,255,255,0.7);
  color: white;
  background: transparent;
}
.btn--outline-white:hover {
  background: white;
  color: var(--c-midnight);
}
.btn--ghost {
  color: var(--c-gold);
  padding: 0 var(--sp-4);
  height: 40px;
}
.btn--ghost:hover { color: var(--c-gold-light); }

.btn--sm { height: 40px; padding: 0 var(--sp-6); font-size: var(--t-xs); }
.btn--lg { height: 56px; padding: 0 var(--sp-10); font-size: 1rem; }
.btn--full { width: 100%; }

/* ─── BADGE / CHIP ─── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--r-full);
  font-size: var(--t-xs);
  font-weight: 600;
}
.badge--discount {
  background: var(--c-discount);
  color: white;
}
.badge--type-nhahang {
  background: rgba(124,45,18,0.12);
  color: var(--c-burgundy);
}
.badge--type-thamvinh {
  background: rgba(12,74,110,0.12);
  color: var(--c-ocean);
}
.badge--type-quadem {
  background: rgba(12,27,51,0.12);
  color: var(--c-navy);
}
.badge--free {
  background: rgba(16,185,129,0.12);
  color: var(--c-success);
}
.badge--hot {
  background: linear-gradient(135deg, #CA8A04, #D4AF37);
  color: #0C0A09;
  animation: shimmer 2s infinite;
}

/* ─── SECTION SPACING ─── */
.section { padding: var(--sp-20) 0; }
.section--sm { padding: var(--sp-12) 0; }
.section--lg { padding: var(--sp-24) 0; }
.section--dark { background: var(--c-midnight); color: white; }
.section--navy { background: var(--c-navy); color: white; }
.section--warm { background: var(--c-cream); }
.section--teal { background: #EFF6FF; }

/* ─── GRID ─── */
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: var(--grid-gap); }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: var(--grid-gap); }
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: var(--grid-gap); }

/* ─── FORM ELEMENTS ─── */
.form-group { display: flex; flex-direction: column; gap: var(--sp-2); }
.form-label { font-size: var(--t-sm); font-weight: 500; color: var(--c-text); }
.form-input {
  height: 52px;
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 0 var(--sp-4);
  font-size: 16px;
  color: var(--c-text);
  background: white;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
  outline: none;
  width: 100%;
}
.form-input:focus {
  border-color: var(--c-gold);
  box-shadow: 0 0 0 3px rgba(202,138,4,0.15);
}
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

/* ─── DIVIDER ─── */
.divider { height: 1px; background: var(--c-border); margin: var(--sp-6) 0; }
.divider--gold { background: linear-gradient(90deg, transparent, var(--c-gold), transparent); height: 1px; margin: var(--sp-8) 0; }

/* ─── STAR RATING ─── */
.stars { color: #F59E0B; letter-spacing: 1px; }

/* ─── ANIMATIONS ─── */
@keyframes shimmer {
  0%,100% { opacity: 1; }
  50% { opacity: 0.85; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  99%  { opacity: 1; transform: translateY(0); }
  to   { opacity: 1; transform: none; }  /* Clear transform so it doesn't create containing block */
}
@keyframes pulse {
  0%,100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}
@keyframes countdown {
  from { opacity: 1; }
  to   { opacity: 0.7; }
}

.fade-up { animation: fadeUp 0.6s var(--ease-out) both; }
.fade-up--d1 { animation-delay: 0.1s; }
.fade-up--d2 { animation-delay: 0.2s; }
.fade-up--d3 { animation-delay: 0.3s; }
.fade-up--d4 { animation-delay: 0.4s; }

/* ─── SKELETON ─── */
.skeleton {
  background: linear-gradient(90deg, #E5E7EB 25%, #F3F4F6 50%, #E5E7EB 75%);
  background-size: 200% 100%;
  animation: skeletonSlide 1.5s infinite;
  border-radius: var(--r-md);
}
@keyframes skeletonSlide {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}

/* ─── RESPONSIVE ─── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2,1fr); }
  .grid-3 { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 700px) {
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .section { padding: var(--sp-12) 0; }
  .section--lg { padding: var(--sp-16) 0; }
}