:root {
  --bg: #07111f;
  --bg-soft: #0e1b2d;
  --surface: #10213a;
  --surface-2: #162b47;
  --text: #f4f7ff;
  --muted: #aebdd6;
  --accent: #66a6ff;
  --accent-2: #38d1b1;
  --border: rgba(255, 255, 255, 0.14);
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.24);
}

body.theme-light {
  --bg: #f4f7ff;
  --bg-soft: #eef4ff;
  --surface: #ffffff;
  --surface-2: #f7faff;
  --text: #122033;
  --muted: #506174;
  --accent: #3a74e8;
  --accent-2: #1fb48f;
  --border: rgba(16, 33, 58, 0.12);
  --shadow: 0 16px 40px rgba(17, 40, 75, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top left, var(--bg-soft) 0%, var(--bg) 60%);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.25s ease, color 0.25s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 1rem 1rem;
  position: sticky;
  top: 0;
  backdrop-filter: blur(16px);
  background: rgba(7, 17, 31, 0.86);
  border-bottom: 1px solid var(--border);
  z-index: 20;
  transition: transform 0.28s ease, opacity 0.28s ease;
}

.topbar.hidden {
  transform: translateY(-120%);
  opacity: 0;
}

body.theme-light .topbar {
  background: rgba(244, 247, 255, 0.88);
}

.topbar-left,
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.brand {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  gap: 1.1rem;
  color: var(--muted);
}

.nav-links a:hover,
.text-link:hover,
.mobile-menu a:hover {
  color: var(--accent-2);
}

.menu-toggle,
.icon-button,
.lang-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 0.55rem 0.7rem;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.menu-toggle:hover,
.icon-button:hover,
.lang-btn:hover {
  transform: translateY(-1px);
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 3px 0;
  background: currentColor;
  border-radius: 999px;
}

.lang-switch {
  display: flex;
  gap: 0.35rem;
}

.lang-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06101d;
  font-weight: 700;
}

.mobile-menu {
  display: none;
  position: absolute;
  top: calc(100% + 0.6rem);
  left: 1rem;
  right: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 0.75rem;
  box-shadow: var(--shadow);
}

.mobile-menu.open {
  display: grid;
  gap: 0.4rem;
}

main {
  width: min(1120px, calc(100% - 2rem));
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.4rem;
  padding: 3rem 0 2rem;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(2rem, 4vw, 3.1rem);
  margin: 0.2rem 0 0.8rem;
  line-height: 1.15;
}

.hero-copy p {
  color: var(--muted);
  font-size: 1.04rem;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.8rem 1.1rem;
  font-weight: 700;
  transition: transform 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #07111c;
}

.button-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid var(--border);
}

.hero-card,
.card,
.detail-card,
.steps article {
  background: linear-gradient(145deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 1.25rem;
}

.hero-card-top {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.8rem;
}

.pill {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-size: 0.82rem;
  background: rgba(102, 166, 255, 0.16);
  color: #cfe2ff;
}

.pill.accent {
  background: rgba(56, 209, 177, 0.16);
  color: #cffff0;
}

.section {
  padding: 1.4rem 0 0.2rem;
}

.section-sticky {
  position: sticky;
  top: 0;
  z-index: 15;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  padding: 0.55rem 0 0.7rem;
  margin-top: 0;
  border-bottom: 1px solid var(--border);
  transform: translateZ(0);
}

.slim-chip-list {
  padding-left: 0.5rem;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 1rem;
}

.eyebrow {
  text-transform: uppercase;
  color: var(--accent-2);
  letter-spacing: 0.22em;
  font-size: 0.8rem;
  margin: 0 0 0.2rem;
}

.section-heading h2 {
  margin: 0;
  font-size: 1.35rem;
}

.chip-list {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.45rem;
  margin-bottom: 0;
  overflow-x: auto;
  padding: 0.1rem 0.2rem 0.15rem;
  -webkit-overflow-scrolling: touch;
}

.chip-list::-webkit-scrollbar {
  height: 8px;
}

.chip-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.18);
  border-radius: 999px;
}

.chip-list::-webkit-scrollbar-track {
  background: transparent;
}

.chip-list a,
.chip-list button {
  flex: 0 0 auto;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border-radius: 999px;
  padding: 0.42rem 0.72rem;
  font-size: 0.9rem;
  cursor: pointer;
}

.chip-list a.active,
.chip-list button.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #07111c;
  font-weight: 700;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

@media (max-width: 900px) {
  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .product-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  padding: 0.85rem;
  overflow: hidden;
}

.card-media {
  margin-bottom: 0.7rem;
}

.product-image,
.detail-main-image {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 1rem;
  display: block;
}

.card h3 {
  margin: 0.2rem 0 0.35rem;
  font-size: 1rem;
}

.card p {
  margin: 0.2rem 0;
}

.price {
  font-size: 0.95rem;
}

@media (max-width: 900px) {
  .card {
    padding: 0.85rem;
  }

  .card h3 {
    font-size: 0.98rem;
  }

  .card p {
    font-size: 0.92rem;
  }
}

.card {
  cursor: pointer;
}

.card-actions a {
  cursor: pointer;
}

.detail-main-image {
  height: 320px;
}

.card-emoji {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.card h3 {
  margin: 0.2rem 0 0.4rem;
}

.price {
  color: var(--accent-2);
  font-weight: 700;
  margin: 0.4rem 0 0.8rem;
}

.card p,
.detail-card p,
.steps p {
  color: var(--muted);
}

.card-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 0.8rem;
}

.detail-card {
  padding: 1.3rem;
  margin-top: 1rem;
}

.detail-media-card {
  padding: 0.8rem;
}

.detail-media {
  display: grid;
  gap: 0.7rem;
}

.gallery-thumbs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.thumb-btn {
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  overflow: hidden;
  cursor: pointer;
  background: transparent;
}

.thumb-btn.active {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 2px rgba(56, 209, 177, 0.18);
}

.thumb-btn img {
  display: block;
  width: 100%;
  height: 70px;
  object-fit: cover;
}

.detail-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.detail-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 1rem;
  margin-top: 1rem;
}

.detail-list {
  padding-left: 1rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.steps article {
  padding: 1rem;
}

.footer {
  text-align: center;
  color: var(--muted);
  padding: 2rem 1rem 2.5rem;
}

@media (max-width: 900px) {
  .hero,
  .detail-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .nav-links,
  .topbar-actions .button {
    display: none;
  }

  .topbar {
    position: sticky;
  }
}

@media (max-width: 700px) {
  .product-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 1.4rem;
  }

  .topbar {
    padding: 0.9rem 1rem;
  }

  .topbar-left,
  .topbar-actions {
    width: 100%;
    justify-content: space-between;
  }

  .mobile-menu {
    left: 0.8rem;
    right: 0.8rem;
  }
}