/* ============================================
   LT LUXURY — Design System
   Cinematic · Minimal · Elevated
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500&family=Didact+Gothic&family=Montserrat:wght@200;300;400;500;600&display=swap');

:root {
  --black: #0a0a0a;
  --deep: #111111;
  --charcoal: #1a1a1a;
  --gold: #c9a84c;
  --gold-light: #e2c27d;
  --gold-muted: #9a7a3a;
  --white: #f5f0e8;
  --white-pure: #ffffff;
  --grey: #666666;
  --grey-light: #999999;
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Montserrat', sans-serif;
  --font-display: 'Didact Gothic', sans-serif;
  --ease-luxury: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-cinematic: cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  background-color: var(--black);
  color: var(--white);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
  cursor: none;
}

/* ---- Custom Cursor ---- */
.cursor {
  width: 10px;
  height: 10px;
  background: var(--gold);
  border-radius: 50%;
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: width 0.3s var(--ease-luxury), height 0.3s var(--ease-luxury), background 0.3s;
  mix-blend-mode: difference;
}

.cursor-follower {
  width: 36px;
  height: 36px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  transition: transform 0.12s var(--ease-luxury), width 0.3s, height 0.3s, border-color 0.3s;
  opacity: 0.6;
}

.cursor.expanded { width: 20px; height: 20px; }
.cursor-follower.expanded { width: 64px; height: 64px; opacity: 0.3; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--gold-muted); }

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 300;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.label-text {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
}

/* ---- Gold Divider ---- */
.gold-line {
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent);
  display: block;
}

/* ============================================
   HEADER
   ============================================ */
#main-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 28px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: padding 0.5s var(--ease-luxury), background 0.5s var(--ease-luxury), backdrop-filter 0.5s;
}

#main-header.scrolled {
  padding: 18px 60px;
  background: rgba(10, 10, 10, 0.75);
  backdrop-filter: blur(24px) saturate(1.5);
  -webkit-backdrop-filter: blur(24px) saturate(1.5);
  border-bottom: 1px solid rgba(201, 168, 76, 0.12);
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--white);
  text-decoration: none;
  text-transform: uppercase;
}

.logo span {
  color: var(--gold);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 48px;
  align-items: center;
}

nav ul li a {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.7);
  text-decoration: none;
  position: relative;
  transition: color 0.3s;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width 0.4s var(--ease-luxury);
}

nav ul li a:hover {
  color: var(--gold-light);
}

nav ul li a:hover::after {
  width: 100%;
}

.nav-cta {
  border: 1px solid rgba(201, 168, 76, 0.5) !important;
  padding: 8px 20px !important;
  color: var(--gold-light) !important;
  transition: background 0.3s, border-color 0.3s !important;
}

.nav-cta:hover {
  background: rgba(201, 168, 76, 0.1) !important;
  border-color: var(--gold) !important;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--white);
  transition: all 0.3s;
}

/* ============================================
   HERO SECTION
   ============================================ */
#hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-video-wrapper {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-video-wrapper video,
.hero-video-wrapper .video-placeholder {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-placeholder {
  background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 40%, #111111 70%, #0d0d0d 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.video-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 80% at 20% 80%, rgba(201, 168, 76, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 60% at 80% 20%, rgba(201, 168, 76, 0.04) 0%, transparent 50%);
}

.video-placeholder::after {
  content: 'VIDEO CINEMATIC';
  font-family: var(--font-sans);
  font-size: 0.6rem;
  letter-spacing: 0.4em;
  color: rgba(201, 168, 76, 0.2);
  font-weight: 500;
}

/* Grain overlay */
.hero-grain {
  position: absolute;
  inset: 0;
  z-index: 1;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(
    to bottom,
    rgba(10,10,10,0.3) 0%,
    rgba(10,10,10,0.15) 40%,
    rgba(10,10,10,0.5) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 0 24px;
  max-width: 1000px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
  opacity: 0;
}

.hero-eyebrow::before,
.hero-eyebrow::after {
  content: '';
  width: 40px;
  height: 1px;
  background: var(--gold);
}

.hero-heading {
  font-family: var(--font-serif);
  font-size: clamp(4rem, 12vw, 10rem);
  font-weight: 300;
  letter-spacing: 0.08em;
  line-height: 0.95;
  color: var(--white);
  text-transform: uppercase;
  opacity: 0;
  transform: translateY(40px);
}

.hero-heading .accent {
  font-style: italic;
  color: var(--gold-light);
  font-weight: 300;
}

.hero-subheading {
  font-family: var(--font-sans);
  font-size: clamp(0.75rem, 1.5vw, 0.9rem);
  font-weight: 300;
  letter-spacing: 0.08em;
  color: rgba(245, 240, 232, 0.75);
  max-width: 580px;
  margin: 28px auto 0;
  line-height: 1.9;
  opacity: 0;
  transform: translateY(20px);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  opacity: 0;
}

.hero-scroll-indicator span {
  font-size: 0.55rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(201, 168, 76, 0.6);
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--gold), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(0.7); }
}

/* ============================================
   SECTION BASE
   ============================================ */
section {
  position: relative;
}

.section-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 60px;
}

/* ============================================
   SECTION 2: TẦM VỊ THẾ
   ============================================ */
#tam-vi-the {
  padding: 160px 0;
  background: var(--deep);
  overflow: hidden;
}

#tam-vi-the .section-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 100px;
  align-items: center;
}

.section-label-group {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 32px;
}

.vi-the-heading {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  color: var(--white);
  margin-bottom: 40px;
}

.vi-the-heading em {
  color: var(--gold-light);
  font-style: italic;
}

.vi-the-paragraph {
  font-size: 0.95rem;
  line-height: 2;
  color: rgba(245, 240, 232, 0.65);
  font-weight: 300;
  max-width: 520px;
}

.vi-the-visual {
  position: relative;
}

.vi-the-img-frame {
  aspect-ratio: 3/4;
  background: var(--charcoal);
  position: relative;
  overflow: hidden;
}

.vi-the-img-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(201,168,76,0.05), transparent);
}

.img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(201,168,76,0.15);
  font-size: 0.55rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  background: linear-gradient(160deg, #1a1a1a 0%, #111 100%);
}

.vi-the-stats {
  position: absolute;
  bottom: -30px;
  left: -30px;
  background: var(--black);
  border: 1px solid rgba(201,168,76,0.2);
  padding: 32px 40px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px 40px;
}

.stat-item .stat-num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--gold-light);
  line-height: 1;
}

.stat-item .stat-label {
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey);
  margin-top: 6px;
}

/* ============================================
   SECTION 3: KIỆT TÁC
   ============================================ */
#kiet-tac {
  padding: 160px 0;
  background: var(--black);
  overflow: hidden;
}

#kiet-tac .section-header {
  text-align: center;
  margin-bottom: 80px;
}

#kiet-tac .section-header h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  color: var(--white);
}

/* Horizontal scroll wrapper */
.projects-track-wrapper {
  overflow: hidden;
  padding: 0 60px;
}

.projects-track {
  display: flex;
  gap: 28px;
}

.project-card {
  flex: 0 0 360px;
  position: relative;
  cursor: pointer;
  overflow: hidden;
}

.project-card-img {
  aspect-ratio: 3/4;
  background: var(--charcoal);
  overflow: hidden;
  position: relative;
}

.project-card-img .img-placeholder {
  transition: transform 0.8s var(--ease-luxury);
  background: linear-gradient(160deg, #1e1e1e 0%, #141414 100%);
  position: relative;
}

.project-card-img .img-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(201,168,76,0.06));
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,10,10,0.95) 0%, rgba(10,10,10,0.2) 60%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 32px;
  transform: translateY(0);
  transition: background 0.5s;
}

.project-card:hover .project-overlay {
  background: linear-gradient(to top, rgba(10,10,10,0.98) 0%, rgba(10,10,10,0.5) 60%, rgba(10,10,10,0.1) 100%);
}

.project-card:hover .project-card-img .img-placeholder {
  transform: scale(1.05);
}

.project-num {
  font-family: var(--font-serif);
  font-size: 4rem;
  font-weight: 300;
  color: rgba(201,168,76,0.1);
  line-height: 1;
  position: absolute;
  top: 24px;
  right: 24px;
}

.project-location {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
}

.project-name {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 14px;
}

.project-tagline {
  font-size: 0.75rem;
  color: rgba(245,240,232,0.5);
  line-height: 1.7;
  font-weight: 300;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s var(--ease-luxury), opacity 0.5s;
  opacity: 0;
}

.project-card:hover .project-tagline {
  max-height: 100px;
  opacity: 1;
}

.project-arrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-top: 20px;
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.4s 0.1s, transform 0.4s 0.1s var(--ease-luxury);
}

.project-arrow::after {
  content: '→';
  font-size: 1rem;
}

.project-card:hover .project-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ============================================
   SECTION 4: DẤU ẤN
   ============================================ */
#dau-an {
  padding: 160px 0;
  background: var(--deep);
  overflow: hidden;
}

#dau-an .section-inner > .section-header {
  max-width: 700px;
  margin-bottom: 80px;
}

.dau-an-heading {
  font-size: clamp(2.5rem, 4.5vw, 4rem);
  color: var(--white);
  margin-bottom: 24px;
}

.dau-an-para {
  font-size: 0.9rem;
  color: rgba(245,240,232,0.55);
  line-height: 2;
  max-width: 520px;
}

/* Masonry Grid */
.masonry-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto;
  gap: 16px;
  margin-bottom: 80px;
}

.masonry-item {
  background: var(--charcoal);
  overflow: hidden;
  position: relative;
}

.masonry-item .img-placeholder {
  background: linear-gradient(160deg, #1e1e1e, #141414);
}

.masonry-item:nth-child(1) { grid-column: 1 / 6; grid-row: 1; aspect-ratio: 4/3; }
.masonry-item:nth-child(2) { grid-column: 6 / 9; grid-row: 1; aspect-ratio: 2/3; }
.masonry-item:nth-child(3) { grid-column: 9 / 13; grid-row: 1 / 3; aspect-ratio: 3/5; }
.masonry-item:nth-child(4) { grid-column: 1 / 4; grid-row: 2; aspect-ratio: 1; }
.masonry-item:nth-child(5) { grid-column: 4 / 9; grid-row: 2; aspect-ratio: 16/9; }

.masonry-item::after {
  content: attr(data-label);
  position: absolute;
  bottom: 16px;
  left: 16px;
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(201,168,76,0.6);
  background: rgba(10,10,10,0.7);
  padding: 4px 10px;
}

.masonry-item:hover .img-placeholder {
  transform: scale(1.04);
}

.masonry-item .img-placeholder {
  width: 100%; height: 100%;
  transition: transform 0.7s var(--ease-luxury);
}

/* Marquee Partners */
.partners-strip {
  overflow: hidden;
  border-top: 1px solid rgba(201,168,76,0.12);
  border-bottom: 1px solid rgba(201,168,76,0.12);
  padding: 28px 0;
}

.marquee-track {
  display: flex;
  gap: 80px;
  width: max-content;
  animation: marqueeScroll 30s linear infinite;
  align-items: center;
}

.marquee-track:hover {
  animation-play-state: paused;
}

@keyframes marqueeScroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.partner-logo {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: rgba(201,168,76,0.35);
  white-space: nowrap;
  text-transform: uppercase;
  transition: color 0.3s;
}

.partner-logo:hover {
  color: var(--gold);
}

.partner-sep {
  width: 4px;
  height: 4px;
  background: rgba(201,168,76,0.3);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============================================
   SECTION 5: LĂNG KÍNH
   ============================================ */
#lang-kinh {
  padding: 160px 0;
  background: var(--black);
}

#lang-kinh .section-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.lang-kinh-text .section-label-group {
  margin-bottom: 24px;
}

.lang-kinh-heading {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  color: var(--white);
  margin-bottom: 28px;
}

.lang-kinh-heading em {
  color: var(--gold-light);
  font-style: italic;
}

.lang-kinh-para {
  font-size: 0.9rem;
  color: rgba(245,240,232,0.55);
  line-height: 2;
}

.video-showcase {
  position: relative;
  aspect-ratio: 16/9;
  background: var(--charcoal);
  overflow: hidden;
}

.video-showcase .img-placeholder {
  background: linear-gradient(160deg, #1a1a1a, #0f0f0f);
}

.video-showcase::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(201,168,76,0.03));
  z-index: 1;
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  width: 80px;
  height: 80px;
  border: 1px solid rgba(201,168,76,0.5);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.3s, background 0.3s;
}

.play-btn::before,
.play-btn::after {
  content: '';
  position: absolute;
  width: 100%; height: 100%;
  border-radius: 50%;
  border: 1px solid rgba(201,168,76,0.3);
  animation: pulsePing 2s ease-out infinite;
}

.play-btn::after {
  animation-delay: 1s;
}

@keyframes pulsePing {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(2.2); opacity: 0; }
}

.play-icon {
  width: 0;
  height: 0;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  border-left: 20px solid var(--gold);
  margin-left: 4px;
}

.play-btn:hover {
  background: rgba(201,168,76,0.1);
  border-color: var(--gold);
}

.video-caption {
  position: absolute;
  bottom: 24px;
  left: 24px;
  z-index: 2;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(201,168,76,0.6);
}

/* ============================================
   FOOTER
   ============================================ */
#footer {
  padding: 100px 60px;
  background: var(--deep);
  border-top: 1px solid rgba(201,168,76,0.1);
  text-align: center;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 40px;
  display: block;
}

.footer-logo span { color: var(--gold); }

.footer-divider {
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-muted), transparent);
  margin: 0 auto 40px;
}

.footer-info {
  display: flex;
  justify-content: center;
  gap: 60px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.footer-info-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-info-item .fi-label {
  font-size: 0.55rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold-muted);
}

.footer-info-item .fi-value {
  font-size: 0.85rem;
  color: rgba(245,240,232,0.65);
  font-weight: 300;
}

.footer-bottom {
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: rgba(245,240,232,0.2);
  text-transform: uppercase;
}

/* ============================================
   ANIMATIONS — Initial States
   ============================================ */
.reveal-up {
  opacity: 0;
  transform: translateY(50px);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
}

.reveal-fade {
  opacity: 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1200px) {
  #tam-vi-the .section-inner { grid-template-columns: 1fr; gap: 60px; }
  .vi-the-stats { position: relative; bottom: auto; left: auto; margin-top: 24px; }
  #lang-kinh .section-inner { grid-template-columns: 1fr; }
  .masonry-item:nth-child(3) { grid-row: 1; grid-column: 9 / 13; }
}

@media (max-width: 768px) {
  #main-header { padding: 20px 24px; }
  #main-header.scrolled { padding: 14px 24px; }
  nav { display: none; }
  .hamburger { display: flex; }
  .section-inner { padding: 0 24px; }
  .projects-track-wrapper { padding: 0 24px; }
  .project-card { flex: 0 0 280px; }
  .masonry-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
  }
  .masonry-item:nth-child(1) { grid-column: 1 / 3; grid-row: 1; }
  .masonry-item:nth-child(2) { grid-column: 1 / 2; grid-row: 2; }
  .masonry-item:nth-child(3) { grid-column: 2 / 3; grid-row: 2; }
  .masonry-item:nth-child(4) { grid-column: 1 / 2; grid-row: 3; }
  .masonry-item:nth-child(5) { grid-column: 1 / 3; grid-row: 4; }
  #footer { padding: 80px 24px; }
  .footer-info { gap: 36px; }
}