:root {
  --bg-white: #FFFFFF;
  --bg-cream: #FAF6F2;
  --bg-warm: #F3EAE0;
  --brown-light: #D4BFA8;
  --brown-muted: #9E826B;
  --brown-primary: #6F4E37;
  --brown-dark: #3E2723;
  --brown-deep: #271713;
  --gold-accent: #D99B26;
  --shadow-soft: 0 12px 32px rgba(62, 39, 35, 0.08);
  --shadow-hover: 0 20px 44px rgba(62, 39, 35, 0.15);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-cream);
  color: var(--brown-dark);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
}

/* Falling Petals Canvas */
#petals-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 99;
  overflow: hidden;
}

.petal {
  position: absolute;
  top: -40px;
  background: linear-gradient(135deg, #F5B041, #D4AC0D);
  border-radius: 150% 0 150% 0;
  opacity: 0.55;
  pointer-events: none;
  animation: fall linear forwards;
}

.petal.brown-petal {
  background: linear-gradient(135deg, #D4BFA8, #9E826B);
  opacity: 0.35;
}

@keyframes fall {
  0% {
    transform: translateY(-20px) rotate(0deg) translateX(0);
  }
  50% {
    transform: translateY(50vh) rotate(180deg) translateX(25px);
  }
  100% {
    transform: translateY(105vh) rotate(360deg) translateX(-20px);
  }
}

/* Navigation / Header */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(111, 78, 55, 0.12);
  padding: 14px 24px;
}

.nav-container {
  max-width: 1160px;
  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(--brown-dark);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-badge {
  background: var(--brown-primary);
  color: var(--bg-white);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--brown-primary);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 8px 14px;
  border-radius: 999px;
  transition: all 0.25s ease;
}

.nav-links a:hover {
  background: var(--bg-warm);
  color: var(--brown-dark);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 10px 18px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
}

.btn-primary {
  background: var(--brown-primary);
  color: var(--bg-white);
  box-shadow: 0 4px 14px rgba(111, 78, 55, 0.28);
}

.btn-primary:hover {
  background: var(--brown-dark);
  transform: translateY(-2px);
}

.btn-outline {
  background: var(--bg-white);
  color: var(--brown-primary);
  border: 1.5px solid var(--brown-light);
}

.btn-outline:hover {
  background: var(--bg-warm);
  border-color: var(--brown-primary);
}

.btn-outline.active {
  background: var(--brown-dark);
  color: var(--bg-white);
  border-color: var(--brown-dark);
}

/* Hero Section */
.hero {
  position: relative;
  padding: 64px 24px 56px;
  background: radial-gradient(circle at 80% 20%, #F3EAE0 0%, #FAF6F2 55%, #FFFFFF 100%);
  border-bottom: 1px solid rgba(111, 78, 55, 0.1);
}

.hero-container {
  max-width: 1160px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-warm);
  color: var(--brown-primary);
  padding: 6px 16px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 20px;
  border: 1px solid var(--brown-light);
}

.hero-title {
  font-size: clamp(2.1rem, 4.2vw, 3.35rem);
  font-weight: 800;
  line-height: 1.18;
  color: var(--brown-dark);
  letter-spacing: -0.025em;
  margin-bottom: 18px;
}

.hero-title span {
  color: var(--brown-primary);
  background: linear-gradient(120deg, rgba(212, 191, 168, 0.45) 0%, rgba(212, 191, 168, 0.45) 100%);
  background-repeat: no-repeat;
  background-size: 100% 36%;
  background-position: 0 85%;
}

.hero-desc {
  font-size: 1.08rem;
  color: #5C4332;
  margin-bottom: 28px;
  max-width: 560px;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.person-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-white);
  padding: 8px 16px 8px 8px;
  border-radius: 999px;
  border: 1px solid var(--brown-light);
  box-shadow: 0 4px 12px rgba(62, 39, 35, 0.05);
  text-decoration: none;
  color: var(--brown-dark);
  font-weight: 700;
  font-size: 0.92rem;
  transition: all 0.25s ease;
}

.person-pill:hover {
  transform: translateY(-3px);
  border-color: var(--brown-primary);
  box-shadow: var(--shadow-soft);
}

.person-pill img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--brown-primary);
}

/* Hero Flower Showcase */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.flower-frame {
  position: relative;
  background: var(--bg-white);
  padding: 16px 16px 22px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hover);
  border: 1px solid rgba(111, 78, 55, 0.16);
  max-width: 390px;
  width: 100%;
  transform: rotate(1.5deg);
  transition: transform 0.35s ease;
}

.flower-frame:hover {
  transform: rotate(0deg) scale(1.02);
}

.flower-img-wrap {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: var(--bg-warm);
}

.flower-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.flower-frame:hover .flower-img-wrap img {
  transform: scale(1.05);
}

.flower-caption {
  margin-top: 14px;
  text-align: center;
}

.flower-caption h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brown-dark);
  margin-bottom: 4px;
}

.flower-caption p {
  font-size: 0.86rem;
  color: var(--brown-muted);
}

.floating-badge {
  position: absolute;
  bottom: 24px;
  left: -24px;
  background: var(--brown-dark);
  color: var(--bg-white);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 600;
}

.floating-badge .icon {
  font-size: 1.4rem;
}

/* Section Common */
.section {
  padding: 72px 24px;
  max-width: 1160px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}

.section-subtitle {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brown-primary);
  background: var(--bg-warm);
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--brown-dark);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  color: #6B5344;
  font-size: 1rem;
}

/* Cards Grid for Ba, Bac, Chi */
.family-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.person-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(111, 78, 55, 0.14);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.card-image-box {
  position: relative;
  aspect-ratio: 4 / 4.2;
  overflow: hidden;
  background: var(--bg-warm);
  cursor: pointer;
}

.card-image-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}

.person-card:hover .card-image-box img {
  transform: scale(1.05);
}

.role-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(62, 39, 35, 0.85);
  backdrop-filter: blur(6px);
  color: var(--bg-white);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.flower-corner {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--bg-white);
  overflow: hidden;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.flower-corner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--brown-dark);
}

.card-traits {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.trait-chip {
  font-size: 0.76rem;
  font-weight: 600;
  background: var(--bg-cream);
  color: var(--brown-primary);
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--brown-light);
}

.card-message {
  font-size: 0.96rem;
  color: #4E3829;
  background: var(--bg-cream);
  padding: 16px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--brown-primary);
  margin-bottom: 18px;
  flex: 1;
  transition: all 0.2s ease;
}

.card-message[contenteditable="true"] {
  outline: 2px dashed var(--brown-primary);
  background: #FFFDF9;
  cursor: text;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--bg-warm);
}

.like-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-warm);
  color: var(--brown-primary);
  border: none;
  padding: 8px 14px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.like-btn:hover,
.like-btn.liked {
  background: var(--brown-primary);
  color: var(--bg-white);
}

.open-letter-btn {
  background: transparent;
  color: var(--brown-dark);
  border: 1px solid var(--brown-light);
  padding: 8px 14px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.open-letter-btn:hover {
  background: var(--brown-dark);
  color: var(--bg-white);
  border-color: var(--brown-dark);
}

/* Sunflower Special Banner */
.sunflower-banner {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid rgba(111, 78, 55, 0.16);
  box-shadow: var(--shadow-soft);
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
}

.sunflower-image-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  max-height: 420px;
  border: 6px solid var(--bg-warm);
  box-shadow: var(--shadow-soft);
}

.sunflower-image-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.sunflower-content h3 {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--brown-dark);
  margin-bottom: 14px;
  line-height: 1.25;
}

.sunflower-content p {
  color: #5C4332;
  font-size: 1.02rem;
  margin-bottom: 16px;
}

.quote-box {
  background: var(--bg-cream);
  border: 1px solid var(--brown-light);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-top: 20px;
  font-weight: 600;
  color: var(--brown-primary);
}

/* Edit Mode Banner */
.edit-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--brown-dark);
  color: var(--bg-white);
  padding: 12px 20px;
  border-radius: 999px;
  box-shadow: var(--shadow-hover);
  font-size: 0.88rem;
  font-weight: 600;
  z-index: 150;
  display: none;
  align-items: center;
  gap: 10px;
}

.edit-toast.show {
  display: flex;
}

/* Modal Letter / Lightbox */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(39, 23, 19, 0.65);
  backdrop-filter: blur(6px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

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

.modal-card {
  background: var(--bg-white);
  max-width: 560px;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  border: 2px solid var(--brown-light);
  animation: modalPop 0.28s ease;
}

@keyframes modalPop {
  from {
    opacity: 0;
    transform: scale(0.92) translateY(12px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-header {
  background: var(--bg-warm);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--brown-light);
}

.modal-header h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--brown-dark);
}

.close-modal {
  background: var(--bg-white);
  border: 1px solid var(--brown-light);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--brown-dark);
  font-weight: 700;
}

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

.modal-body img {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 18px;
  border: 3px solid var(--bg-warm);
}

.modal-body p {
  font-size: 1.02rem;
  color: var(--brown-dark);
  background: var(--bg-cream);
  padding: 16px;
  border-radius: var(--radius-md);
  text-align: left;
  line-height: 1.7;
}

/* Interactive Mailbox & Mini Letters Section */
.mailbox-section {
  padding-bottom: 32px;
}

.mailbox-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.mailbox-wrapper {
  perspective: 1000px;
  margin-bottom: 24px;
}

.mailbox-box {
  position: relative;
  width: 340px;
  height: 220px;
  background: linear-gradient(145deg, var(--brown-primary), var(--brown-dark));
  border-radius: 20px;
  box-shadow: 0 20px 45px rgba(62, 39, 35, 0.25);
  cursor: pointer;
  user-select: none;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
  border: 3px solid var(--brown-light);
}

.mailbox-box:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 26px 54px rgba(62, 39, 35, 0.32);
}

.mailbox-lid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 110px;
  z-index: 4;
  transform-origin: top center;
  transition: transform 0.65s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lid-flap {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, #8B6347 0%, #5A3D29 100%);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  border-top-left-radius: 16px;
  border-top-right-radius: 16px;
}

.wax-seal {
  position: absolute;
  bottom: -18px;
  left: 50%;
  transform: translateX(-50%);
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #E6B450, #B57C1E);
  color: var(--brown-deep);
  font-weight: 800;
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--bg-white);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.28);
  transition: transform 0.4s ease, opacity 0.4s ease;
}

.mailbox-box.opened .mailbox-lid {
  transform: rotateX(165deg);
  z-index: 1;
}

.mailbox-box.opened .wax-seal {
  opacity: 0;
  transform: translateX(-50%) scale(0.5);
}

.mailbox-inner-glow {
  position: absolute;
  inset: 12px;
  border-radius: 14px;
  background: radial-gradient(circle at 50% 20%, rgba(255, 236, 179, 0.45), transparent 70%);
  opacity: 0;
  transition: opacity 0.5s ease;
  z-index: 1;
}

.mailbox-box.opened .mailbox-inner-glow {
  opacity: 1;
}

.peek-letters {
  position: absolute;
  top: 22px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 14px;
  z-index: 2;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.4s ease;
}

.peek-env {
  font-size: 2.2rem;
  background: var(--bg-white);
  padding: 6px 12px;
  border-radius: 10px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.18);
  border: 1px solid var(--brown-light);
}

.peek-env.env-1 { transform: rotate(-10deg) translateY(6px); }
.peek-env.env-2 { transform: translateY(-6px); }
.peek-env.env-3 { transform: rotate(10deg) translateY(6px); }

.mailbox-box.opened .peek-letters {
  transform: translateX(-50%) translateY(-56px) scale(1.1);
}

.mailbox-front {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 145px;
  background: linear-gradient(180deg, var(--brown-primary) 0%, var(--brown-dark) 100%);
  border-radius: 0 0 16px 16px;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  border-top: 2px solid rgba(255, 255, 255, 0.18);
}

.mailbox-label {
  background: var(--bg-cream);
  color: var(--brown-dark);
  padding: 12px 22px;
  border-radius: 14px;
  text-align: center;
  border: 1.5px solid var(--brown-light);
  box-shadow: inset 0 2px 6px rgba(62, 39, 35, 0.08);
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 90%;
}

.mailbox-icon {
  font-size: 1.35rem;
}

.mailbox-label strong {
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: var(--brown-dark);
}

.mailbox-label small {
  font-size: 0.8rem;
  color: var(--brown-primary);
  font-weight: 600;
}

/* Khay 3 lá thư nhỏ bật ra */
.mini-letters-tray {
  width: 100%;
  max-width: 1040px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(-16px);
  transition: max-height 0.7s ease, opacity 0.5s ease, transform 0.5s ease;
}

.mini-letters-tray.visible {
  max-height: 1800px;
  opacity: 1;
  transform: translateY(0);
  margin-top: 12px;
}

.tray-instruction {
  text-align: center;
  font-weight: 700;
  color: var(--brown-primary);
  background: var(--bg-warm);
  padding: 10px 20px;
  border-radius: 999px;
  display: table;
  margin: 0 auto 28px;
  font-size: 0.92rem;
  border: 1px solid var(--brown-light);
}

.mini-envelopes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
  padding: 12px 6px 6px;
}

.mini-envelope {
  position: relative;
  background: var(--bg-white);
  border-radius: 18px;
  border: 2px solid var(--brown-light);
  box-shadow: var(--shadow-soft);
  padding-top: 38px;
  cursor: pointer;
  transition: all 0.35s ease;
  overflow: hidden;
}

.mini-envelope:hover,
.mini-envelope.active {
  transform: translateY(-8px);
  border-color: var(--brown-primary);
  box-shadow: var(--shadow-hover);
}

.mini-envelope.active {
  background: var(--bg-warm);
  border-width: 2.5px;
}

.mini-env-flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 68px;
  background: linear-gradient(180deg, #E8D8C8 0%, #D4BFA8 100%);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transition: transform 0.4s ease;
  transform-origin: top;
  z-index: 2;
}

.mini-envelope:hover .mini-env-flap,
.mini-envelope.active .mini-env-flap {
  transform: rotateX(160deg);
}

.mini-env-paper {
  position: relative;
  z-index: 1;
  background: var(--bg-white);
  width: 84%;
  margin: 0 auto;
  padding: 12px;
  border-radius: 12px 12px 0 0;
  border: 1px solid var(--brown-light);
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateY(12px);
  transition: transform 0.35s ease;
  box-shadow: 0 -4px 12px rgba(62, 39, 35, 0.06);
}

.mini-envelope:hover .mini-env-paper,
.mini-envelope.active .mini-env-paper {
  transform: translateY(-4px);
}

.mini-env-paper img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--brown-primary);
}

.mini-env-paper span {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--brown-dark);
}

.mini-env-body {
  position: relative;
  z-index: 3;
  background: linear-gradient(180deg, #FAF6F2 0%, #F3EAE0 100%);
  padding: 24px 18px 20px;
  text-align: center;
  border-top: 1.5px dashed var(--brown-light);
}

.mini-seal {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--brown-primary);
  color: var(--bg-white);
  font-weight: 800;
  font-size: 0.78rem;
  padding: 5px 14px;
  border-radius: 999px;
  border: 2px solid var(--bg-white);
  box-shadow: 0 4px 10px rgba(62, 39, 35, 0.2);
}

.mini-env-to {
  font-size: 1.02rem;
  color: var(--brown-dark);
  margin-top: 6px;
  margin-bottom: 6px;
}

.mini-env-hint {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--brown-primary);
}

/* Khung giấy viết thư mở ra khi chọn phong bì nhỏ */
.opened-letter-paper {
  display: none;
  background: #FFFDF9;
  border-radius: var(--radius-lg);
  border: 2px solid var(--brown-light);
  box-shadow: var(--shadow-hover);
  padding: 32px 36px;
  max-width: 780px;
  margin: 0 auto 16px;
  position: relative;
  animation: modalPop 0.35s ease;
}

.opened-letter-paper.show {
  display: block;
}

.paper-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  margin-bottom: 22px;
  border-bottom: 1.5px dashed var(--brown-light);
}

.paper-stamp {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-warm);
  padding: 6px 14px 6px 6px;
  border-radius: 999px;
  border: 1px solid var(--brown-light);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--brown-dark);
}

.paper-stamp img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

.close-paper-btn {
  background: var(--bg-warm);
  color: var(--brown-dark);
  border: 1px solid var(--brown-light);
  padding: 6px 14px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.close-paper-btn:hover {
  background: var(--brown-primary);
  color: var(--bg-white);
}

.letter-sheet-content {
  display: none;
}

.letter-sheet-content.active {
  display: block;
}

.sheet-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
}

.sheet-avatar {
  width: 74px;
  height: 74px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--brown-primary);
  box-shadow: 0 6px 16px rgba(62, 39, 35, 0.15);
}

.sheet-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--brown-primary);
  background: var(--bg-warm);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 6px;
}

.sheet-header h3 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--brown-dark);
}

.sheet-text {
  background: var(--bg-cream);
  padding: 22px 24px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--brown-primary);
  color: var(--brown-dark);
  font-size: 1.02rem;
  line-height: 1.8;
  margin-bottom: 18px;
}

.sheet-text p + p {
  margin-top: 12px;
}

.sheet-signature {
  text-align: right;
  color: var(--brown-primary);
  font-size: 0.98rem;
  padding-right: 8px;
}

/* Footer */
.footer {
  background: var(--brown-dark);
  color: var(--bg-cream);
  text-align: center;
  padding: 48px 24px;
  margin-top: 40px;
}

.footer h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--bg-white);
}

.footer p {
  color: var(--brown-light);
  font-size: 0.92rem;
}

/* Device Selector Overlay & Modal (White-Brown Theme) */
.device-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(39, 23, 19, 0.78);
  backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 1;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

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

.device-select-card {
  max-width: 640px;
  width: 100%;
  background: var(--bg-white);
  border: 2.5px solid var(--brown-light);
  border-radius: 28px;
  padding: 32px 30px;
  box-shadow: 0 28px 80px rgba(39, 23, 19, 0.45);
  text-align: center;
  transition: transform 0.45s ease, opacity 0.45s ease;
}

.device-overlay.hidden-overlay .device-select-card {
  transform: scale(0.92) translateY(16px);
  opacity: 0;
}

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

.device-crest {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: var(--bg-cream);
  border: 2px solid var(--brown-light);
  padding: 4px;
  box-shadow: 0 6px 14px rgba(62, 39, 35, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.device-crest img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
}

.device-crest.flag-crest {
  font-size: 1.7rem;
  background: var(--brown-dark);
  color: var(--bg-white);
}

.device-sub-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--brown-primary);
  background: var(--bg-warm);
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 10px;
  border: 1px solid var(--brown-light);
}

.device-header-text h2 {
  font-size: clamp(1.65rem, 3.2vw, 2.25rem);
  font-weight: 800;
  color: var(--brown-dark);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.device-header-text p {
  font-size: 0.92rem;
  color: #6B5344;
  max-width: 490px;
  margin: 0 auto 24px;
  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, var(--bg-cream) 0%, var(--bg-warm) 100%);
  border: 2px solid var(--brown-light);
  border-radius: 20px;
  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 8px 20px rgba(62, 39, 35, 0.08);
}

.device-option-btn:hover {
  transform: translateY(-5px) scale(1.02);
  border-color: var(--brown-primary);
  background: var(--bg-white);
  box-shadow: var(--shadow-hover);
}

.device-img-wrapper {
  width: 100%;
  height: 145px;
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 14px;
  background: var(--brown-deep);
  border: 1.5px solid var(--brown-light);
  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(--brown-dark);
}

.device-tag {
  font-size: 0.68rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 999px;
}

.desktop-tag {
  background: var(--brown-primary);
  color: var(--bg-white);
}

.mobile-tag {
  background: var(--brown-dark);
  color: var(--bg-cream);
}

.device-option-info p {
  font-size: 0.8rem;
  color: #5C4332;
  line-height: 1.45;
}

.device-footer-note {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--brown-primary);
  font-style: italic;
}

/* Chế độ hiển thị khi chọn Điện Thoại (Mobile View) ngay cả trên màn hình lớn */
body.mobile-device-view {
  background-color: #E6D7C8;
}

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: var(--bg-cream);
  box-shadow: 0 0 36px rgba(62, 39, 35, 0.12);
}

body.mobile-device-view .hero-container,
body.mobile-device-view .sunflower-banner,
body.mobile-device-view .family-grid,
body.mobile-device-view .mini-envelopes-grid {
  grid-template-columns: 1fr !important;
}

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

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

  .family-grid,
  .mini-envelopes-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
  }

  .floating-badge {
    left: 12px;
  }

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

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

  .device-options-grid {
    grid-template-columns: 1fr;
  }

  .device-select-card {
    padding: 22px 18px;
  }
}