/* ============================================================
   One Central Saigon — spoke site
   Palette: ivory / deep ink navy / champagne gold
   ============================================================ */
:root {
  --ink: #0f141d;
  --navy: #16202e;
  --navy-2: #1d2a3b;
  --ivory: #f7f3ec;
  --cream: #efe7da;
  --white: #ffffff;
  --gold: #b48d4e;
  --gold-2: #d8b978;
  --gold-3: #f0dcae;
  --text: #2b303a;
  --muted: #6e7480;
  --line: rgba(180, 141, 78, 0.28);
  --shadow: 0 24px 60px rgba(15, 20, 29, 0.16);
  --radius: 14px;
  --font-display: 'Playfair Display', 'Times New Roman', serif;
  --font-body: 'Be Vietnam Pro', 'Segoe UI', system-ui, sans-serif;
  --header-h: 76px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--ivory);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

.container { width: min(1180px, 92vw); margin-inline: auto; }

/* ---------- preloader ---------- */
#preloader {
  position: fixed; inset: 0; z-index: 200;
  background: var(--ink);
  display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 18px;
  transition: opacity 0.7s ease, visibility 0.7s ease;
}
#preloader.done { opacity: 0; visibility: hidden; pointer-events: none; }
.preloader-mark { width: 74px; height: 74px; animation: preloaderSpin 2.6s linear infinite; }
.preloader-word {
  color: var(--gold-3); font-family: var(--font-display); letter-spacing: 0.42em; text-indent: 0.42em;
  font-size: 13px; text-transform: uppercase; opacity: 0; animation: preloaderWord 1.1s 0.15s var(--ease-out) forwards;
}
@keyframes preloaderSpin { to { transform: rotate(360deg); } }
@keyframes preloaderWord { to { opacity: 1; } }

/* ---------- header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  transition: background 0.45s ease, box-shadow 0.45s ease, height 0.45s ease;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.site-header.scrolled {
  background: rgba(15, 20, 29, 0.92);
  backdrop-filter: blur(14px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  height: 64px;
}
.brand { display: flex; flex-direction: column; line-height: 1.15; color: var(--white); }
.brand-name { font-family: var(--font-display); font-size: 20px; letter-spacing: 0.24em; }
.brand-name .o { color: var(--gold-2); }
.brand-sub { font-size: 9.5px; letter-spacing: 0.58em; text-indent: 0.06em; color: var(--gold-2); text-transform: uppercase; }

.main-nav { display: flex; align-items: center; gap: 26px; }
.main-nav a {
  color: rgba(255, 255, 255, 0.85); font-size: 13.5px; letter-spacing: 0.04em; position: relative; padding: 6px 0;
}
.main-nav a::after {
  content: ''; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%;
  background: var(--gold-2); transform: scaleX(0); transform-origin: right; transition: transform 0.35s var(--ease-out);
}
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); transform-origin: left; }
.main-nav a:hover { color: var(--white); }

.nav-cta {
  border: 1px solid var(--gold-2); color: var(--gold-3) !important; padding: 9px 18px !important; border-radius: 999px;
  font-size: 12.5px !important; letter-spacing: 0.08em; text-transform: uppercase;
  transition: background 0.3s ease, color 0.3s ease;
}
.nav-cta::after { display: none; }
.nav-cta:hover { background: var(--gold-2); color: var(--ink) !important; }

.lang-switch { display: flex; gap: 2px; border: 1px solid rgba(255,255,255,0.35); border-radius: 999px; padding: 3px; }
.lang-switch a {
  font-size: 11.5px; padding: 3px 10px; border-radius: 999px; color: rgba(255,255,255,0.75); letter-spacing: 0.06em;
}
.lang-switch a.on { background: var(--gold-2); color: var(--ink); font-weight: 600; }

.nav-toggle { display: none; background: none; border: 0; width: 40px; height: 40px; position: relative; z-index: 130; }
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--white); margin: 5px auto; transition: transform 0.35s ease, opacity 0.35s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- hero ---------- */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; overflow: hidden; color: var(--white); }
.hero-bg { position: absolute; inset: 0; overflow: hidden; }
.hero-bg img {
  width: 100%; height: 100%; object-fit: cover; object-position: center 30%;
  animation: kenburns 22s var(--ease-out) forwards;
  transform-origin: center;
}
@keyframes kenburns { from { transform: scale(1.14); } to { transform: scale(1); } }
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15,20,29,0.55) 0%, rgba(15,20,29,0.18) 40%, rgba(15,20,29,0.72) 100%);
}
.hero-crescent {
  position: absolute; right: -12vw; top: 50%; width: 58vw; max-width: 880px; aspect-ratio: 1; opacity: 0.5;
  transform: translateY(-50%); pointer-events: none;
  animation: crescentFloat 12s ease-in-out infinite alternate;
}
@keyframes crescentFloat { from { transform: translateY(-52%) rotate(-4deg); } to { transform: translateY(-48%) rotate(5deg); } }

.hero-inner { position: relative; z-index: 2; padding: calc(var(--header-h) + 40px) 0 90px; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 14px;
  font-size: 12.5px; letter-spacing: 0.34em; text-transform: uppercase; color: var(--gold-3); margin-bottom: 22px;
}
.hero-eyebrow::before { content: ''; width: 44px; height: 1px; background: var(--gold-2); }
.hero h1 {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(44px, 8vw, 96px); line-height: 1.04; letter-spacing: 0.02em; margin-bottom: 8px;
}
.hero h1 .thin { font-weight: 400; }
.hero-sub {
  font-family: var(--font-display); font-style: italic; font-size: clamp(17px, 2.4vw, 25px);
  color: var(--gold-3); margin-bottom: 30px;
}
.hero-desc { max-width: 560px; color: rgba(255,255,255,0.82); font-size: 15.5px; font-weight: 300; margin-bottom: 38px; }

/* line mask reveal */
.line-reveal { display: block; overflow: hidden; }
.line-reveal > span { display: block; transform: translateY(110%); animation: lineUp 1.1s var(--ease-out) forwards; }
.hero.armed .line-reveal:nth-child(1) > span { animation-delay: 0.15s; }
.hero.armed .line-reveal:nth-child(2) > span { animation-delay: 0.3s; }
@keyframes lineUp { to { transform: translateY(0); } }
.fade-item { opacity: 0; transform: translateY(24px); animation: fadeItem 1s var(--ease-out) forwards; }
@keyframes fadeItem { to { opacity: 1; transform: none; } }

.hero-ctas { display: flex; flex-wrap: wrap; gap: 16px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 15px 32px; border-radius: 999px; font-size: 14px; letter-spacing: 0.06em; font-weight: 500;
  border: 1px solid transparent; transition: transform 0.3s var(--ease-out), box-shadow 0.3s ease, background 0.3s ease, color 0.3s ease;
}
.btn:hover { transform: translateY(-3px); }
.btn-gold {
  background: linear-gradient(120deg, var(--gold) 0%, var(--gold-2) 55%, var(--gold) 100%);
  background-size: 200% 100%; color: var(--ink); font-weight: 600;
  box-shadow: 0 14px 34px rgba(180, 141, 78, 0.4);
  animation: goldSlide 5s ease infinite;
}
@keyframes goldSlide { 0%,100% { background-position: 0% 0; } 50% { background-position: 100% 0; } }
.btn-ghost { border-color: rgba(255,255,255,0.55); color: var(--white); }
.btn-ghost:hover { background: rgba(255,255,255,0.12); }
.btn-dark { background: var(--ink); color: var(--gold-3); }
.btn-dark:hover { background: var(--navy-2); }

.scroll-cue {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%); z-index: 3;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  color: rgba(255,255,255,0.75); font-size: 10.5px; letter-spacing: 0.34em; text-transform: uppercase;
}
.scroll-cue i { width: 1px; height: 52px; background: rgba(255,255,255,0.4); position: relative; overflow: hidden; }
.scroll-cue i::after {
  content: ''; position: absolute; top: -50%; left: 0; width: 100%; height: 50%;
  background: var(--gold-2); animation: cueDrop 2s ease-in-out infinite;
}
@keyframes cueDrop { 0% { top: -50%; } 70%, 100% { top: 110%; } }

/* ---------- stats band ---------- */
.stats { background: var(--ink); color: var(--white); padding: 58px 0; position: relative; overflow: hidden; }
.stats::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(720px 220px at 85% 0%, rgba(180,141,78,0.22), transparent 65%);
}
.stats-grid { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.stat { text-align: center; padding: 6px 10px; border-left: 1px solid rgba(216,185,120,0.22); }
.stat:first-child { border-left: 0; }
.stat-num {
  font-family: var(--font-display); font-size: clamp(30px, 4vw, 46px); color: var(--gold-2); line-height: 1.1;
}
.stat-num small { font-size: 0.5em; letter-spacing: 0.06em; }
.stat-label { font-size: 12.5px; letter-spacing: 0.14em; text-transform: uppercase; color: rgba(255,255,255,0.66); margin-top: 8px; }

/* ---------- generic sections ---------- */
.section { padding: clamp(76px, 10vw, 130px) 0; position: relative; }
.section-dark { background: var(--ink); color: rgba(255,255,255,0.88); }
.section-cream { background: var(--cream); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 14px;
  font-size: 12px; letter-spacing: 0.32em; text-transform: uppercase; color: var(--gold); margin-bottom: 16px;
}
.eyebrow::before { content: ''; width: 40px; height: 1px; background: var(--gold); }
.section-dark .eyebrow { color: var(--gold-2); }
h2.title {
  font-family: var(--font-display); font-weight: 600; color: var(--ink);
  font-size: clamp(30px, 4.6vw, 52px); line-height: 1.14; margin-bottom: 22px;
}
.section-dark h2.title { color: var(--white); }
h2.title em { font-style: italic; font-weight: 400; color: var(--gold); }
.section-dark h2.title em { color: var(--gold-2); }
.lead { font-size: 17px; font-weight: 300; color: var(--muted); max-width: 640px; }
.section-dark .lead { color: rgba(255,255,255,0.72); }

/* scroll reveal */
.reveal { opacity: 0; transform: translateY(42px); transition: opacity 1s var(--ease-out), transform 1s var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }
.reveal-left { opacity: 0; transform: translateX(-48px); transition: opacity 1.1s var(--ease-out), transform 1.1s var(--ease-out); }
.reveal-right { opacity: 0; transform: translateX(48px); transition: opacity 1.1s var(--ease-out), transform 1.1s var(--ease-out); }
.reveal-left.in, .reveal-right.in { opacity: 1; transform: none; }
.stagger > * { opacity: 0; transform: translateY(30px); transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out); }
.stagger.in > * { opacity: 1; transform: none; }
.stagger.in > *:nth-child(2) { transition-delay: 0.12s; }
.stagger.in > *:nth-child(3) { transition-delay: 0.24s; }
.stagger.in > *:nth-child(4) { transition-delay: 0.36s; }
.stagger.in > *:nth-child(5) { transition-delay: 0.48s; }
.stagger.in > *:nth-child(6) { transition-delay: 0.6s; }

/* ---------- story / overview ---------- */
.split { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(36px, 6vw, 80px); align-items: center; }
.split.flip { grid-template-columns: 0.95fr 1.05fr; }
.frame { position: relative; }
.frame img { border-radius: var(--radius); box-shadow: var(--shadow); }
.frame::before {
  content: ''; position: absolute; inset: 22px -22px -22px 22px; border: 1px solid var(--line);
  border-radius: var(--radius); z-index: -1;
}
.frame-badge {
  position: absolute; left: -26px; bottom: 30px; background: var(--ink); color: var(--gold-3);
  padding: 16px 22px; border-radius: 12px; box-shadow: var(--shadow); max-width: 240px;
}
.frame-badge strong { display: block; font-family: var(--font-display); font-size: 21px; color: var(--gold-2); }
.frame-badge span { font-size: 12px; letter-spacing: 0.08em; color: rgba(255,255,255,0.7); }

.facts { margin-top: 30px; border-top: 1px solid var(--line); }
.facts li {
  display: flex; justify-content: space-between; gap: 18px; padding: 11px 2px;
  border-bottom: 1px solid var(--line); font-size: 14.5px;
}
.facts .k { color: var(--muted); letter-spacing: 0.02em; flex: 0 0 auto; }
.facts .v { text-align: right; font-weight: 500; color: var(--ink); }

/* ---------- parallax band ---------- */
.band { position: relative; height: clamp(320px, 52vw, 560px); overflow: hidden; }
.band img {
  position: absolute; left: 0; top: -12%; width: 100%; height: 124%; object-fit: cover; will-change: transform;
}
.band::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(15,20,29,0.3), transparent 35%, rgba(15,20,29,0.35)); }
.band-caption {
  position: absolute; z-index: 2; left: 0; right: 0; bottom: 34px; text-align: center; color: var(--white);
  font-family: var(--font-display); font-style: italic; font-size: clamp(17px, 2.6vw, 26px); letter-spacing: 0.04em;
  text-shadow: 0 4px 24px rgba(0,0,0,0.5);
}

/* ---------- location ---------- */
.loc-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(34px, 5vw, 70px); align-items: start; }
.loc-list { margin-top: 26px; }
.loc-list li {
  display: flex; align-items: baseline; gap: 14px; padding: 12px 0; border-bottom: 1px dashed var(--line); font-size: 15px;
}
.loc-list .dot { flex: 0 0 8px; width: 8px; height: 8px; border-radius: 50%; background: var(--gold-2); transform: translateY(-2px); }
.loc-list .dist { margin-left: auto; color: var(--gold); font-weight: 600; white-space: nowrap; font-size: 13.5px; }
.map-embed { border: 0; width: 100%; height: 100%; min-height: 380px; border-radius: var(--radius); box-shadow: var(--shadow); filter: saturate(0.92); }

/* ---------- marquee ---------- */
.marquee { overflow: hidden; background: var(--ink); padding: 20px 0; border-block: 1px solid rgba(216,185,120,0.25); }
.marquee-track { display: flex; gap: 0; width: max-content; animation: marquee 30s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee span {
  font-family: var(--font-display); font-size: 15px; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--gold-3); padding: 0 28px; white-space: nowrap;
}
.marquee span::after { content: '◦'; color: var(--gold); margin-left: 56px; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- amenities ---------- */
.amen-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 44px; }
.amen {
  background: rgba(255,255,255,0.045); border: 1px solid rgba(216,185,120,0.2); border-radius: var(--radius);
  padding: 30px 26px; transition: transform 0.4s var(--ease-out), border-color 0.4s ease, background 0.4s ease;
}
.amen:hover { transform: translateY(-8px); border-color: var(--gold-2); background: rgba(216,185,120,0.08); }
.amen svg { width: 34px; height: 34px; stroke: var(--gold-2); margin-bottom: 16px; }
.amen h3 { font-family: var(--font-display); font-weight: 600; font-size: 19px; color: var(--white); margin-bottom: 8px; }
.amen p { font-size: 13.5px; color: rgba(255,255,255,0.62); line-height: 1.65; }

/* ---------- ritz duo images ---------- */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.duo img { border-radius: var(--radius); box-shadow: var(--shadow); }
.duo .up { transform: translateY(-26px); }

/* ---------- gallery ---------- */
.gallery-rail {
  display: flex; gap: 20px; overflow-x: auto; padding: 10px 4vw 26px; scroll-snap-type: x mandatory;
  cursor: grab; scrollbar-width: thin; scrollbar-color: var(--gold) transparent;
}
.gallery-rail.dragging { cursor: grabbing; scroll-snap-type: none; }
.g-item { flex: 0 0 auto; scroll-snap-align: center; position: relative; overflow: hidden; border-radius: var(--radius); }
.g-item img {
  height: clamp(260px, 40vw, 420px); width: auto; transition: transform 0.8s var(--ease-out); user-select: none; -webkit-user-drag: none;
}
.g-item:hover img { transform: scale(1.06); }
.g-item figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 40px 18px 14px; color: var(--white); font-size: 12.5px; letter-spacing: 0.1em;
  background: linear-gradient(180deg, transparent, rgba(15,20,29,0.8)); text-transform: uppercase;
}

/* lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 150; background: rgba(10, 13, 19, 0.94);
  display: flex; align-items: center; justify-content: center; padding: 4vh 4vw;
  opacity: 0; visibility: hidden; transition: opacity 0.4s ease, visibility 0.4s ease;
}
.lightbox.open { opacity: 1; visibility: visible; }
.lightbox img { max-width: 92vw; max-height: 86vh; border-radius: 10px; box-shadow: 0 30px 90px rgba(0,0,0,0.6); }
.lightbox-close {
  position: absolute; top: 22px; right: 26px; background: none; border: 0; color: var(--white); font-size: 34px; line-height: 1; opacity: 0.8;
}
.lightbox-close:hover { opacity: 1; }

/* ---------- pricing ---------- */
.price-card {
  background: linear-gradient(135deg, var(--navy) 0%, var(--ink) 100%);
  border: 1px solid rgba(216,185,120,0.3); border-radius: 20px; padding: clamp(30px, 5vw, 56px);
  color: var(--white); display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center;
  position: relative; overflow: hidden;
}
.price-card::after {
  content: ''; position: absolute; right: -140px; top: -140px; width: 380px; height: 380px; border-radius: 50%;
  border: 1px solid rgba(216,185,120,0.35);
}
.price-rows { margin-top: 26px; }
.price-rows li { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.12); font-size: 15px; }
.price-rows .k { color: rgba(255,255,255,0.6); }
.price-rows .v { color: var(--gold-3); font-weight: 500; text-align: right; }
.price-note { font-size: 12px; color: rgba(255,255,255,0.5); margin-top: 16px; }
.price-cta { text-align: center; }
.price-cta .big { font-family: var(--font-display); font-size: 24px; color: var(--gold-2); margin-bottom: 18px; line-height: 1.3; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 40px auto 0; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; background: none; border: 0; text-align: left; display: flex; justify-content: space-between; align-items: center; gap: 18px;
  padding: 22px 4px; font-size: 16.5px; font-weight: 500; color: var(--ink); font-family: var(--font-body);
}
.faq-q .plus { flex: 0 0 auto; width: 30px; height: 30px; border: 1px solid var(--gold); border-radius: 50%; position: relative; transition: transform 0.4s var(--ease-out), background 0.3s ease; }
.faq-q .plus::before, .faq-q .plus::after {
  content: ''; position: absolute; inset: 0; margin: auto; background: var(--gold); transition: background 0.3s ease;
}
.faq-q .plus::before { width: 12px; height: 1.5px; }
.faq-q .plus::after { width: 1.5px; height: 12px; }
.faq-item.open .plus { transform: rotate(135deg); background: var(--gold); }
.faq-item.open .plus::before, .faq-item.open .plus::after { background: var(--ink); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.55s var(--ease-out); }
.faq-a p { padding: 0 4px 24px; color: var(--muted); font-size: 15px; max-width: 720px; }

/* ---------- contact ---------- */
.contact-wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(36px, 5vw, 70px); align-items: start; }
.contact-info h3 { font-family: var(--font-display); font-size: 24px; color: var(--white); margin-bottom: 14px; }
.contact-info p { color: rgba(255,255,255,0.72); font-size: 15px; }
.contact-points { margin-top: 26px; }
.contact-points li { display: flex; gap: 14px; padding: 10px 0; color: rgba(255,255,255,0.8); font-size: 14.5px; align-items: baseline; }
.contact-points .tick { color: var(--gold-2); }
.contact-form {
  background: var(--white); border-radius: 20px; padding: clamp(26px, 4vw, 44px); box-shadow: var(--shadow);
}
.contact-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%; border: 1px solid #d9d2c4; background: var(--ivory); border-radius: 10px; padding: 13px 15px;
  font-family: inherit; font-size: 15px; color: var(--text); transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.field textarea { resize: vertical; min-height: 96px; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--gold); box-shadow: 0 0 0 4px rgba(180,141,78,0.15);
}
.form-note { font-size: 12px; color: var(--muted); margin-top: 14px; }

/* ---------- footer ---------- */
.site-footer { background: #0b0f16; color: rgba(255,255,255,0.62); padding: 64px 0 34px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 44px; margin-bottom: 40px; }
.site-footer h4 {
  color: var(--gold-2); font-family: var(--font-display); font-size: 17px; font-weight: 600; margin-bottom: 16px; letter-spacing: 0.04em;
}
.site-footer a:hover { color: var(--gold-3); }
.site-footer li { padding: 4px 0; }
.footer-disclaimer {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 22px; font-size: 12px; color: rgba(255,255,255,0.42); line-height: 1.8;
}

/* ---------- floating zalo ---------- */
.float-contact { position: fixed; right: 22px; bottom: 22px; z-index: 90; display: flex; flex-direction: column; gap: 12px; }
.float-btn {
  width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  color: var(--white); font-weight: 700; font-size: 13px; box-shadow: 0 12px 30px rgba(0,0,0,0.3);
  transition: transform 0.3s var(--ease-out);
}
.float-btn:hover { transform: scale(1.1); }
.float-zalo { background: #0068ff; position: relative; }
.float-zalo::after {
  content: ''; position: absolute; inset: -6px; border-radius: 50%; border: 2px solid rgba(0, 104, 255, 0.5);
  animation: pulse 2s ease-out infinite;
}
.float-phone { background: linear-gradient(135deg, var(--gold), var(--gold-2)); color: var(--ink); }
@keyframes pulse { 0% { transform: scale(0.85); opacity: 1; } 100% { transform: scale(1.3); opacity: 0; } }

/* back to top */
#toTop {
  position: fixed; left: 22px; bottom: 22px; z-index: 90; width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid var(--line); background: rgba(255,255,255,0.85); backdrop-filter: blur(8px); color: var(--gold);
  font-size: 18px; opacity: 0; visibility: hidden; transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.3s ease;
}
#toTop.show { opacity: 1; visibility: visible; }
#toTop:hover { transform: translateY(-4px); }

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  .main-nav a:not(.nav-cta) { display: none; }
  .nav-toggle { display: block; }
  .main-nav.mobile-open a { display: block; }
  .main-nav.mobile-open {
    position: fixed; inset: 0; background: rgba(15,20,29,0.97); backdrop-filter: blur(16px);
    flex-direction: column; justify-content: center; gap: 8px; z-index: 120;
  }
  .main-nav.mobile-open a { font-size: 22px; padding: 12px; font-family: var(--font-display); }
  .main-nav.mobile-open .nav-cta { margin-top: 18px; }
  .split, .split.flip, .loc-grid, .price-card, .contact-wrap { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 34px 18px; }
  .stat { border-left: 0; }
  .amen-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .frame::before { display: none; }
  .frame-badge { left: 12px; bottom: 14px; }
  .duo .up { transform: none; }
}
@media (max-width: 620px) {
  .amen-grid, .footer-grid, .contact-form .row { grid-template-columns: 1fr; }
  .hero-crescent { width: 96vw; right: -30vw; opacity: 0.3; }
  .lang-switch { display: none; }
  .site-header .lang-switch { display: flex; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-bg img, .hero-crescent, .marquee-track, .float-zalo::after, .btn-gold, .scroll-cue i::after, .preloader-mark { animation: none !important; }
  .line-reveal > span { transform: none; animation: none; }
  .fade-item { opacity: 1; transform: none; animation: none; }
  .reveal, .reveal-left, .reveal-right, .stagger > * { opacity: 1 !important; transform: none !important; transition: none !important; }
  #preloader { display: none; }
}