:root {
  --bg: #0d1117;
  --bg-elevated: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #7ee787;
  --accent-strong: #3fb950;
}

html[data-theme="light"] {
  --bg: #ffffff;
  --bg-elevated: #f6f8fa;
  --border: #d0d7de;
  --text: #1f2328;
  --text-dim: #57606a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.2s ease, color 0.2s ease;
}

/* ---------- topbar ---------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.brand {
  font-weight: 700;
  font-size: 1.25rem;
  white-space: nowrap;
}

.brand span {
  color: var(--accent);
}

.search {
  flex: 1;
  max-width: 420px;
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
}

.search:focus {
  outline: 2px solid var(--accent-strong);
}

.topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 0.5rem 0.7rem;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

.user-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cart-button {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
  font-size: 1rem;
}

.cart-count {
  background: var(--accent);
  color: #0d1117;
  font-weight: 700;
  font-size: 0.75rem;
  border-radius: 999px;
  padding: 0.05rem 0.4rem;
  margin-left: 0.15rem;
}

/* ---------- buttons ---------- */

.btn-primary {
  background: var(--accent);
  color: #0d1117;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

/* ---------- hero + products ---------- */

main {
  flex: 1;
  padding: 2rem 1.5rem 3rem;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.hero {
  text-align: center;
  margin-bottom: 2rem;
}

.hero p {
  color: var(--text-dim);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
}

.product-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.product-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-strong);
}

.product-thumb {
  height: 110px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 2.5rem;
}

.product-name {
  font-weight: 600;
}

.product-price {
  color: var(--accent);
  font-weight: 700;
}

.product-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-dim);
  padding: 2rem 0;
}

/* ---------- cart drawer ---------- */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 20;
}

.overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.cart-drawer {
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: min(360px, 90vw);
  background: var(--bg-elevated);
  border-left: 1px solid var(--border);
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 30;
  display: flex;
  flex-direction: column;
}

.cart-drawer.open {
  transform: translateX(0);
}

.cart-drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.cart-drawer-header button {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.1rem;
  cursor: pointer;
}

.cart-items {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.cart-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cart-item-thumb {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.cart-item-info {
  flex: 1;
  min-width: 0;
}

.cart-item-name {
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cart-item-price {
  color: var(--text-dim);
  font-size: 0.8rem;
}

.qty-controls {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.qty-controls button {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

.cart-empty {
  color: var(--text-dim);
  text-align: center;
  padding: 2rem 0;
}

.cart-footer {
  border-top: 1px solid var(--border);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.cart-total {
  display: flex;
  justify-content: space-between;
  font-size: 1.05rem;
}

/* ---------- login modal ---------- */

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 20px 60px -15px rgba(0, 0, 0, 0.45);
  padding: 1.5rem;
  width: min(320px, 90vw);
  max-height: 85vh;
  overflow-y: auto;
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.modal.open {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.modal-close {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text);
}

.quick-view-modal {
  width: min(360px, 90vw);
  text-align: center;
}

.quick-view-thumb {
  height: 140px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 4rem;
  margin-bottom: 0.5rem;
}

.quick-view-modal .modal-hint {
  margin-top: 0;
}

.quick-view-modal .product-price {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.quick-view-modal .btn-primary {
  width: 100%;
}

.modal-hint {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: -0.5rem;
}

.modal form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.modal input {
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--accent);
  color: #0d1117;
  font-weight: 700;
  display: grid;
  place-items: center;
  font-size: 0.8rem;
}

/* ---------- toast ---------- */

.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translate(-50%, 20px);
  background: var(--accent);
  color: #0d1117;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 50;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.site-footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
}

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  .topbar {
    flex-wrap: wrap;
    padding: 0.85rem 1rem;
    row-gap: 0.6rem;
  }

  .brand {
    order: 1;
  }

  .topbar-actions {
    order: 2;
  }

  .search {
    order: 3;
    flex: 1 1 100%;
    max-width: none;
  }

  main {
    padding: 1.5rem 1rem 2rem;
  }

  .hero h1 {
    font-size: 1.4rem;
  }

  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.85rem;
  }

  .product-card {
    padding: 1rem;
  }

  .modal {
    width: min(340px, 92vw);
    padding: 1.25rem;
  }

  .quick-view-thumb {
    height: 110px;
    font-size: 3rem;
  }
}

@media (max-width: 380px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}