:root {
  /* Bảng màu chủ đạo: Cam pha với Vàng (Warm Orange & Golden Yellow) */
  --bg-ivory: #FFFDF7;
  --bg-soft-yellow: #FFF8DB;
  --bg-warm-amber: #FFECB3;
  --yellow-bright: #FFD166;
  --yellow-gold: #F59E0B;
  --orange-soft: #FB923C;
  --orange-primary: #F97316;
  --orange-deep: #EA580C;
  --orange-rich: #C2410C;
  --text-dark: #431407;
  --text-muted: #7C2D12;
  --border-gold: #FCD34D;
  --border-orange: #FDBA74;

  --gradient-orange-yellow: linear-gradient(135deg, #EA580C 0%, #F97316 48%, #FBBF24 100%);
  --gradient-yellow-orange: linear-gradient(135deg, #FDE047 0%, #F59E0B 50%, #EA580C 100%);
  --gradient-card-bg: linear-gradient(180deg, #FFFFFF 0%, #FFFBEB 100%);
  --gradient-stage: linear-gradient(180deg, #FFF7ED 0%, #FEF3C7 52%, #FFEDD5 100%);

  --shadow-soft: 0 12px 32px rgba(234, 88, 12, 0.12);
  --shadow-hover: 0 20px 44px rgba(234, 88, 12, 0.22);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: linear-gradient(180deg, #FFFDF5 0%, #FFF7ED 50%, #FFFBEB 100%);
  color: var(--text-dark);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
}

/* Lớp cánh hoa vàng cam rơi & bóng bay toàn trang */
#petals-container,
#floating-balloons-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 90;
  overflow: hidden;
}

#floating-balloons-layer .balloon-item {
  pointer-events: auto;
}

.petal {
  position: absolute;
  top: -40px;
  background: linear-gradient(135deg, #FBBF24, #F97316);
  border-radius: 150% 0 150% 0;
  opacity: 0.65;
  pointer-events: none;
  animation: fallPetal linear forwards;
  box-shadow: 0 2px 6px rgba(249, 115, 22, 0.25);
}

.petal.yellow-petal {
  background: linear-gradient(135deg, #FEF08A, #F59E0B);
}

@keyframes fallPetal {
  0% {
    transform: translateY(-20px) rotate(0deg) translateX(0);
  }
  50% {
    transform: translateY(50vh) rotate(180deg) translateX(28px);
  }
  100% {
    transform: translateY(105vh) rotate(360deg) translateX(-22px);
  }
}

/* ================= MÀN HÌNH CHỌN THIẾT BỊ ================= */
.device-overlay {
  position: fixed;
  inset: 0;
  z-index: 400;
  background: radial-gradient(circle at center, rgba(124, 45, 18, 0.82), rgba(67, 20, 7, 0.92));
  backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 1;
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.device-overlay.hidden-overlay {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.device-select-card {
  max-width: 660px;
  width: 100%;
  background: linear-gradient(180deg, #FFFFFF 0%, #FFFBEB 100%);
  border: 3px solid var(--border-gold);
  border-radius: 30px;
  padding: 32px 30px;
  box-shadow: 0 28px 80px rgba(67, 20, 7, 0.55), 0 0 0 6px rgba(251, 191, 36, 0.2);
  text-align: center;
  transition: transform 0.45s ease, opacity 0.45s ease;
}

.device-overlay.hidden-overlay .device-select-card {
  transform: scale(0.92) translateY(18px);
  opacity: 0;
}

.device-top-badges {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.device-crest {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: #FFF7ED;
  border: 2px solid var(--orange-soft);
  padding: 3px;
  box-shadow: 0 6px 16px rgba(234, 88, 12, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.device-crest img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 11px;
}

.device-crest.flag-crest {
  font-size: 1.4rem;
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  border-color: #FDE047;
}

.device-sub-badge {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  color: var(--orange-deep);
  background: linear-gradient(90deg, #FEF3C7, #FFEDD5);
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 10px;
  border: 1.5px solid var(--border-gold);
}

.device-header-text h2 {
  font-size: clamp(1.65rem, 3.2vw, 2.2rem);
  font-weight: 800;
  background: var(--gradient-orange-yellow);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.device-header-text p {
  font-size: 0.94rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 22px;
  line-height: 1.55;
}

.device-options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 20px;
}

.device-option-btn {
  background: linear-gradient(180deg, #FFFDF7 0%, #FEF3C7 100%);
  border: 2.5px solid var(--border-gold);
  border-radius: 22px;
  padding: 16px;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 10px 24px rgba(234, 88, 12, 0.1);
}

.device-option-btn:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: var(--orange-primary);
  background: linear-gradient(180deg, #FFFFFF 0%, #FFEDD5 100%);
  box-shadow: var(--shadow-hover);
}

.device-img-wrapper {
  width: 100%;
  height: 148px;
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 14px;
  background: linear-gradient(135deg, #431407, #7C2D12);
  border: 2px solid var(--border-gold);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.device-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
  transition: transform 0.45s ease;
}

.device-img-wrapper.mobile-img-wrap img {
  object-fit: contain;
}

.device-option-btn:hover .device-img-wrapper img {
  transform: scale(1.06);
}

.device-option-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.device-option-title-row h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-dark);
}

.device-tag {
  font-size: 0.68rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 999px;
}

.desktop-tag {
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
}

.mobile-tag {
  background: var(--yellow-gold);
  color: #431407;
}

.device-option-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.device-footer-note {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--orange-deep);
}

/* ================= THANH ĐIỀU HƯỚNG ================= */
.navbar {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(255, 251, 235, 0.9);
  backdrop-filter: blur(14px);
  border-bottom: 2px solid rgba(251, 191, 36, 0.45);
  padding: 12px 24px;
  box-shadow: 0 4px 20px rgba(234, 88, 12, 0.08);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text-dark);
  text-decoration: none;
}

.brand-badge {
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 800;
  box-shadow: 0 3px 10px rgba(234, 88, 12, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: 999px;
  transition: all 0.25s ease;
}

.nav-links a:hover {
  background: #FEF3C7;
  color: var(--orange-deep);
}

.nav-links a.nav-highlight {
  background: linear-gradient(90deg, #FEF3C7, #FFEDD5);
  color: var(--orange-deep);
  border: 1.5px solid var(--border-gold);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.88rem;
  padding: 10px 18px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
}

.btn-lg {
  font-size: 0.96rem;
  padding: 13px 24px;
}

.btn-sm {
  font-size: 0.8rem;
  padding: 7px 14px;
}

.btn-primary {
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  box-shadow: 0 6px 18px rgba(234, 88, 12, 0.32);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(234, 88, 12, 0.42);
}

.btn-golden {
  background: linear-gradient(135deg, #FDE047 0%, #F59E0B 100%);
  color: #431407;
  box-shadow: 0 6px 16px rgba(245, 158, 11, 0.35);
}

.btn-golden:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
}

.btn-outline {
  background: #FFFFFF;
  color: var(--orange-deep);
  border: 2px solid var(--border-gold);
}

.btn-outline:hover,
.btn-outline.active {
  background: #FEF3C7;
  border-color: var(--orange-primary);
}

/* ================= HERO SECTION ================= */
.hero {
  position: relative;
  padding: 56px 24px 64px;
  background: radial-gradient(circle at 80% 20%, #FEF08A 0%, #FFEDD5 45%, #FFFBEB 100%);
  border-bottom: 2px solid rgba(251, 191, 36, 0.4);
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.45;
  pointer-events: none;
}

.glow-orange {
  width: 340px;
  height: 340px;
  background: #FB923C;
  top: -60px;
  left: -80px;
}

.glow-yellow {
  width: 380px;
  height: 380px;
  background: #FDE047;
  bottom: -80px;
  right: 5%;
}

.hero-container {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 44px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(90deg, #FEF3C7, #FFEDD5);
  color: var(--orange-deep);
  padding: 7px 18px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 18px;
  border: 1.5px solid var(--border-gold);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.15);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 4.3vw, 3.4rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--text-dark);
  margin-bottom: 18px;
}

.gradient-name {
  background: linear-gradient(135deg, #C2410C 0%, #EA580C 45%, #D97706 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-desc {
  font-size: 1.06rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  max-width: 580px;
}

.mom-info-badges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
  max-width: 560px;
}

.info-pill {
  background: rgba(255, 255, 255, 0.92);
  border: 2px solid var(--border-gold);
  border-radius: 16px;
  padding: 10px 14px;
  box-shadow: 0 6px 16px rgba(234, 88, 12, 0.08);
}

.pill-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--orange-deep);
  margin-bottom: 2px;
}

.info-pill strong {
  font-size: 0.92rem;
  color: var(--text-dark);
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Khung 2 ảnh Hero */
.hero-photo-showcase {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.main-photo-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: #FFFFFF;
  border-radius: 26px;
  padding: 14px;
  border: 3px solid var(--border-gold);
  box-shadow: var(--shadow-hover);
  cursor: pointer;
  transition: transform 0.35s ease;
}

.main-photo-card:hover {
  transform: translateY(-5px) rotate(-0.5deg);
}

.photo-badge {
  position: absolute;
  top: 24px;
  left: 24px;
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.78rem;
  padding: 6px 14px;
  border-radius: 999px;
  z-index: 3;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.main-photo-card img {
  width: 100%;
  height: 330px;
  object-fit: cover;
  border-radius: 18px;
  display: block;
}

.photo-card-caption {
  padding: 12px 8px 4px;
  text-align: center;
}

.photo-card-caption h3 {
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--text-dark);
}

.photo-card-caption p {
  font-size: 0.85rem;
  color: var(--orange-deep);
  font-weight: 600;
}

.secondary-photo-card {
  position: relative;
  margin-top: -38px;
  margin-right: -36px;
  align-self: flex-end;
  width: 230px;
  background: linear-gradient(135deg, #FFFBEB, #FFEDD5);
  border: 3px solid var(--orange-primary);
  border-radius: 22px;
  padding: 10px;
  box-shadow: 0 16px 36px rgba(67, 20, 7, 0.24);
  cursor: pointer;
  transition: transform 0.35s ease;
  z-index: 4;
}

.secondary-photo-card:hover {
  transform: scale(1.05) rotate(2deg);
}

.secondary-photo-card img {
  width: 100%;
  height: 175px;
  object-fit: cover;
  border-radius: 14px;
  display: block;
}

.secondary-caption {
  text-align: center;
  padding-top: 8px;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--orange-deep);
}

/* ================= CÁC SECTION CHUNG ================= */
.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 68px 24px;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 44px;
}

.section-subtitle {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--orange-deep);
  background: linear-gradient(90deg, #FEF3C7, #FFEDD5);
  padding: 5px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--border-gold);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  font-weight: 900;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
}

/* ================= 2 BỨC ẢNH KỶ NIỆM NỔI BẬT ================= */
.featured-duo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.duo-card {
  background: var(--gradient-card-bg);
  border: 2.5px solid var(--border-gold);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: all 0.35s ease;
  display: flex;
  flex-direction: column;
}

.duo-card:hover {
  transform: translateY(-6px);
  border-color: var(--orange-primary);
  box-shadow: var(--shadow-hover);
}

.duo-img-box {
  position: relative;
  height: 380px;
  background: linear-gradient(135deg, #FFF7ED, #FEF3C7);
  padding: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.duo-img-box img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 18px;
  transition: transform 0.45s ease;
}

.duo-card:hover .duo-img-box img {
  transform: scale(1.03);
}

.duo-tag {
  position: absolute;
  top: 24px;
  left: 24px;
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 6px 14px;
  border-radius: 999px;
  box-shadow: 0 4px 12px rgba(234, 88, 12, 0.3);
}

.duo-body {
  padding: 24px 26px 26px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.duo-body h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.duo-body p {
  font-size: 0.96rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  background: rgba(254, 243, 199, 0.55);
  padding: 14px 16px;
  border-radius: 14px;
  border-left: 4px solid var(--orange-primary);
}

.duo-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.love-react-btn,
.view-full-btn {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.86rem;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.25s ease;
}

.love-react-btn {
  background: linear-gradient(90deg, #FEF3C7, #FFEDD5);
  color: var(--orange-deep);
  border: 1.5px solid var(--border-gold);
}

.love-react-btn:hover {
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  border-color: transparent;
}

.view-full-btn {
  background: #FFFFFF;
  color: var(--text-dark);
  border: 1.5px solid var(--border-orange);
}

.view-full-btn:hover {
  background: #FFF7ED;
  border-color: var(--orange-deep);
}

/* ================= MINI GAME ĐẬP BÓNG BAY NỔ SÔ CÔ LA & TRÁI TIM ================= */
.game-section {
  padding-top: 24px;
}

.game-container-card {
  background: linear-gradient(145deg, #FFFBEB 0%, #FFF7ED 55%, #FEF3C7 100%);
  border: 3px solid var(--orange-soft);
  border-radius: 32px;
  padding: 36px 28px;
  box-shadow: 0 24px 60px rgba(234, 88, 12, 0.16);
  position: relative;
  overflow: hidden;
}

.game-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 28px;
}

.game-badge {
  display: inline-block;
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.8rem;
  padding: 6px 18px;
  border-radius: 999px;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.3);
}

.game-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.35rem);
  color: var(--text-dark);
  margin-bottom: 10px;
}

.game-header p {
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* Bảng điểm */
.game-scoreboard {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.score-box {
  background: #FFFFFF;
  border: 2px solid var(--border-gold);
  border-radius: 20px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 8px 20px rgba(234, 88, 12, 0.08);
}

.score-icon {
  font-size: 2.1rem;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(135deg, #FEF3C7, #FFEDD5);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.score-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
}

.score-box strong {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--orange-deep);
}

/* Thanh tiến trình mở quà */
.milestone-bar-wrap {
  background: #FFFFFF;
  border: 2px solid var(--border-gold);
  border-radius: 18px;
  padding: 12px 18px;
  margin-bottom: 20px;
}

.milestone-bar-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
  gap: 8px;
}

.milestone-track {
  width: 100%;
  height: 14px;
  background: #FEF3C7;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border-gold);
}

.milestone-fill {
  width: 0%;
  height: 100%;
  background: var(--gradient-orange-yellow);
  border-radius: 999px;
  transition: width 0.35s ease;
}

/* Điều khiển game */
.game-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 20px;
}

.mode-selector {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  background: #FFFFFF;
  padding: 8px 12px;
  border-radius: 999px;
  border: 2px solid var(--border-gold);
}

.mode-selector span {
  font-size: 0.84rem;
  font-weight: 800;
  color: var(--text-muted);
  padding-left: 6px;
}

.mode-btn {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 7px 14px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--text-dark);
  cursor: pointer;
  transition: all 0.2s ease;
}

.mode-btn.active {
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  box-shadow: 0 3px 10px rgba(234, 88, 12, 0.25);
}

.action-buttons {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Sân chơi bóng bay */
.balloon-stage {
  position: relative;
  width: 100%;
  height: 490px;
  background: radial-gradient(circle at 50% 25%, #FFFBEB 0%, #FEF08A 48%, #FDBA74 100%);
  border-radius: 26px;
  border: 3px solid var(--orange-primary);
  overflow: hidden;
  box-shadow: inset 0 8px 28px rgba(234, 88, 12, 0.14);
  user-select: none;
}

.stage-bg-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.stage-sun {
  position: absolute;
  top: -50px;
  right: -50px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, #FDE047 0%, rgba(251, 146, 60, 0) 70%);
  opacity: 0.8;
}

.stage-wish-banner {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.92);
  border: 2px solid var(--orange-primary);
  color: var(--text-dark);
  padding: 8px 20px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.9rem;
  text-align: center;
  box-shadow: 0 6px 18px rgba(234, 88, 12, 0.16);
  max-width: 92%;
  z-index: 15;
  transition: transform 0.25s ease;
}

.balloon-arena {
  position: absolute;
  inset: 0;
  z-index: 5;
  overflow: hidden;
}

/* Quả bóng bay */
.balloon-item {
  position: absolute;
  bottom: -120px;
  width: 76px;
  height: 92px;
  border-radius: 50% 50% 50% 50% / 45% 45% 55% 55%;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: inset -10px -10px 20px rgba(0, 0, 0, 0.16), 0 10px 22px rgba(234, 88, 12, 0.25);
  animation: floatUpBalloon linear forwards;
  transition: transform 0.15s ease, filter 0.15s ease;
  user-select: none;
  z-index: 10;
}

.balloon-item:hover {
  filter: brightness(1.1);
  transform: scale(1.1);
}

/* Ánh sáng bóng trên quả bóng bay */
.balloon-item::before {
  content: '';
  position: absolute;
  top: 14px;
  left: 16px;
  width: 16px;
  height: 26px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  transform: rotate(-28deg);
  pointer-events: none;
}

/* Dây bóng bay */
.balloon-item::after {
  content: '';
  position: absolute;
  bottom: -34px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 34px;
  background: rgba(124, 45, 18, 0.45);
  pointer-events: none;
}

.balloon-knot {
  position: absolute;
  bottom: -6px;
  width: 12px;
  height: 8px;
  background: inherit;
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

.balloon-label {
  font-size: 1.4rem;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
  pointer-events: none;
}

.balloon-subtext {
  font-size: 0.65rem;
  font-weight: 800;
  color: #FFFFFF;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
  pointer-events: none;
  margin-top: 2px;
}

@keyframes floatUpBalloon {
  0% {
    transform: translateY(0) translateX(0) rotate(-3deg);
  }
  25% {
    transform: translateY(-160px) translateX(14px) rotate(3deg);
  }
  50% {
    transform: translateY(-320px) translateX(-14px) rotate(-3deg);
  }
  75% {
    transform: translateY(-480px) translateX(10px) rotate(3deg);
  }
  100% {
    transform: translateY(-680px) translateX(-8px) rotate(-2deg);
  }
}

/* Hiệu ứng Vật phẩm Nổ Ra: Sô-cô-la hoặc Trái tim */
.burst-reward-item {
  position: absolute;
  font-size: 2.1rem;
  pointer-events: none;
  z-index: 25;
  filter: drop-shadow(0 6px 12px rgba(67, 20, 7, 0.28));
  animation: burstOutAndFloat 1.55s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes burstOutAndFloat {
  0% {
    transform: translate(0, 0) scale(0.3) rotate(0deg);
    opacity: 1;
  }
  35% {
    transform: translate(var(--tx), var(--ty)) scale(1.35) rotate(var(--rot));
    opacity: 1;
  }
  100% {
    transform: translate(var(--tx-end), calc(var(--ty) - 90px)) scale(0.95) rotate(calc(var(--rot) * 1.5));
    opacity: 0;
  }
}

/* Lời chúc nhỏ bay lên khi nổ bóng */
.pop-floating-text {
  position: absolute;
  z-index: 30;
  background: linear-gradient(90deg, #EA580C, #F59E0B);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.82rem;
  padding: 5px 12px;
  border-radius: 999px;
  border: 2px solid #FFFBEB;
  box-shadow: 0 6px 16px rgba(67, 20, 7, 0.25);
  pointer-events: none;
  white-space: nowrap;
  animation: popTextRise 1.6s ease-out forwards;
}

@keyframes popTextRise {
  0% {
    transform: translate(-50%, 0) scale(0.6);
    opacity: 1;
  }
  25% {
    transform: translate(-50%, -18px) scale(1.08);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -70px) scale(0.95);
    opacity: 0;
  }
}

/* Vòng sóng xung kích khi bóng nổ */
.pop-shockwave {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 3px solid #F59E0B;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 20;
  animation: shockwaveExpand 0.45s ease-out forwards;
}

@keyframes shockwaveExpand {
  0% {
    width: 16px;
    height: 16px;
    opacity: 1;
  }
  100% {
    width: 130px;
    height: 130px;
    opacity: 0;
  }
}

/* Khay hứng Sô-cô-la & Trái tim dưới đáy sân chơi */
.collected-tray {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 251, 235, 0.94);
  border-top: 2px solid var(--border-gold);
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 18;
  min-height: 54px;
}

.tray-title {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--orange-deep);
  white-space: nowrap;
}

.collected-items-list {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  flex: 1;
  padding: 2px 0;
}

.empty-tray-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
}

.tray-badge-item {
  font-size: 1.25rem;
  background: #FFF7ED;
  border: 1.5px solid var(--border-gold);
  border-radius: 10px;
  padding: 2px 7px;
  animation: trayPopIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes trayPopIn {
  0% { transform: scale(0); }
  100% { transform: scale(1); }
}

/* ================= BỨC THƯ 20/10 GỬI MẸ LƯU PHƯƠNG LOAN ================= */
.letter-showcase {
  max-width: 840px;
  margin: 0 auto;
}

.envelope-card {
  position: relative;
  background: linear-gradient(135deg, #F97316 0%, #F59E0B 55%, #FBBF24 100%);
  border-radius: 26px;
  padding: 36px 24px 28px;
  text-align: center;
  color: #FFFFFF;
  cursor: pointer;
  box-shadow: 0 18px 44px rgba(234, 88, 12, 0.28);
  border: 3px solid #FEF08A;
  margin-bottom: 24px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.envelope-card:hover {
  transform: translateY(-4px);
}

.envelope-seal {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #FFFBEB;
  color: var(--orange-deep);
  font-weight: 900;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  border: 3px solid var(--border-gold);
  box-shadow: 0 6px 16px rgba(67, 20, 7, 0.25);
}

.envelope-avatar {
  width: 78px;
  height: 78px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #FFFFFF;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.22);
  margin-bottom: 10px;
}

.envelope-to-label {
  display: block;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: #FEF9C3;
  margin-bottom: 4px;
}

.envelope-front-content h3 {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  margin-bottom: 6px;
}

.envelope-front-content p {
  font-size: 0.88rem;
  font-weight: 700;
  color: #FFFBEB;
}

.letter-paper-card {
  display: none;
  background: #FFFDF9;
  border: 3px solid var(--border-gold);
  border-radius: 28px;
  padding: 32px 36px;
  box-shadow: var(--shadow-hover);
  animation: modalPop 0.35s ease;
}

.letter-paper-card.open {
  display: block;
}

.letter-paper-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  padding-bottom: 18px;
  margin-bottom: 24px;
  border-bottom: 2px dashed var(--border-gold);
}

.letter-stamp {
  display: flex;
  align-items: center;
  gap: 12px;
}

.letter-stamp img {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  object-fit: cover;
  border: 2px solid var(--orange-primary);
}

.letter-stamp strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-dark);
}

.letter-stamp span {
  font-size: 0.8rem;
  color: var(--orange-deep);
  font-weight: 600;
}

.letter-paper-body h3 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  color: var(--orange-deep);
  margin-bottom: 16px;
}

.letter-paragraphs {
  background: linear-gradient(180deg, #FFFBEB 0%, #FFF7ED 100%);
  padding: 24px;
  border-radius: 18px;
  border-left: 5px solid var(--orange-primary);
  font-size: 1.02rem;
  color: var(--text-dark);
  line-height: 1.8;
  margin-bottom: 18px;
}

.letter-paragraphs p + p {
  margin-top: 14px;
}

.letter-signature {
  text-align: right;
  font-size: 1rem;
  color: var(--orange-deep);
}

/* ================= ALBUM KỶ NIỆM ================= */
.album-filter-bar {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.filter-chip {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.88rem;
  padding: 9px 18px;
  border-radius: 999px;
  border: 2px solid var(--border-gold);
  background: #FFFFFF;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.25s ease;
}

.filter-chip.active,
.filter-chip:hover {
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 6px 16px rgba(234, 88, 12, 0.25);
}

.album-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.album-item {
  background: #FFFFFF;
  border: 2px solid var(--border-gold);
  border-radius: 24px;
  padding: 12px;
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.album-item:hover {
  transform: translateY(-6px);
  border-color: var(--orange-primary);
  box-shadow: var(--shadow-hover);
}

.album-img-wrap {
  position: relative;
  height: 270px;
  border-radius: 16px;
  background: linear-gradient(180deg, #FFFBEB, #FFEDD5);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 6px;
}

.album-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 12px;
  transition: transform 0.45s ease;
}

.album-item:hover .album-img-wrap img {
  transform: scale(1.04);
}

.album-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 999px;
}

.album-caption {
  padding: 12px 8px 6px;
  text-align: center;
}

.album-caption h4 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 4px;
}

.album-caption p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ================= MODAL & LIGHTBOX ================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(67, 20, 7, 0.75);
  backdrop-filter: blur(8px);
  z-index: 350;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
}

.modal-card {
  background: #FFFDF9;
  border: 3px solid var(--border-gold);
  border-radius: 28px;
  max-width: 620px;
  width: 100%;
  overflow: hidden;
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.45);
  animation: modalPop 0.35s ease;
}

@keyframes modalPop {
  0% {
    transform: scale(0.9) translateY(14px);
    opacity: 0;
  }
  100% {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

.modal-header {
  background: linear-gradient(90deg, #FEF3C7, #FFEDD5);
  padding: 16px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid var(--border-gold);
}

.modal-header h4 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--orange-deep);
}

.close-modal {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1.5px solid var(--orange-primary);
  background: #FFFFFF;
  color: var(--orange-deep);
  font-weight: 800;
  cursor: pointer;
}

.modal-body {
  padding: 24px;
  text-align: center;
}

.reward-icons-burst {
  font-size: 2rem;
  margin-bottom: 14px;
  letter-spacing: 6px;
}

.reward-photos-pair {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

.reward-photos-pair img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  border-radius: 16px;
  border: 2.5px solid var(--orange-primary);
}

.reward-modal-card h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--orange-deep);
  margin-bottom: 10px;
}

.lightbox-card {
  max-width: 760px;
}

.lightbox-card #lightbox-img {
  width: 100%;
  max-height: 68vh;
  object-fit: contain;
  background: #271206;
  border-radius: 18px;
  margin-bottom: 14px;
}

/* Chế độ chỉnh sửa trực tiếp */
[contenteditable="true"] {
  outline: 2px dashed var(--orange-primary);
  outline-offset: 6px;
  background: rgba(254, 243, 199, 0.7);
  border-radius: 8px;
}

.edit-toast {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--gradient-orange-yellow);
  color: #FFFFFF;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.88rem;
  box-shadow: 0 12px 30px rgba(234, 88, 12, 0.35);
  z-index: 250;
  transition: transform 0.35s ease;
}

.edit-toast.show {
  transform: translateX(-50%) translateY(0);
}

/* Footer */
.footer {
  background: linear-gradient(135deg, #7C2D12 0%, #9A3412 50%, #B45309 100%);
  color: #FFFBEB;
  text-align: center;
  padding: 48px 24px;
  border-top: 4px solid var(--border-gold);
}

.footer-badge {
  display: inline-block;
  background: rgba(254, 243, 199, 0.2);
  border: 1px solid #FDE047;
  color: #FDE047;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.footer h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: #FEF08A;
  margin-bottom: 6px;
}

.footer p {
  color: #FFEDD5;
  font-size: 0.92rem;
}

/* ================= CHẾ ĐỘ MOBILE VIEW KHI CHỌN ĐIỆN THOẠI ================= */
body.mobile-device-view {
  background: #FDE68A;
}

body.mobile-device-view .navbar,
body.mobile-device-view .hero,
body.mobile-device-view .section,
body.mobile-device-view .footer {
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

body.mobile-device-view .hero,
body.mobile-device-view .section {
  background-color: #FFFDF7;
  box-shadow: 0 0 36px rgba(234, 88, 12, 0.15);
}

body.mobile-device-view .hero-container,
body.mobile-device-view .featured-duo-grid,
body.mobile-device-view .game-scoreboard,
body.mobile-device-view .album-grid {
  grid-template-columns: 1fr !important;
}

body.mobile-device-view .nav-links {
  display: none;
}

body.mobile-device-view .secondary-photo-card {
  margin-top: 14px;
  margin-right: 0;
  align-self: center;
  width: 100%;
  max-width: 320px;
}

/* Responsive */
@media (max-width: 960px) {
  .hero-container,
  .featured-duo-grid {
    grid-template-columns: 1fr;
  }

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

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

  .secondary-photo-card {
    margin-right: 0;
  }
}

@media (max-width: 600px) {
  .nav-links {
    display: none;
  }

  .device-options-grid,
  .game-scoreboard,
  .album-grid,
  .mom-info-badges,
  .reward-photos-pair {
    grid-template-columns: 1fr;
  }

  .letter-paper-card {
    padding: 22px 18px;
  }

  .balloon-stage {
    height: 440px;
  }
}