:root {
  --max-w: 1100px;
  --accent: #0b72ff;
  --accent-dark: #095a9d;
  --bg-light: #f7f7f8;
  --border-light: #eee;
  --text-dark: #222;
  --radius: 8px;
  --shadow-light: 0 8px 30px rgba(0, 0, 0, 0.08);
  --font-base: 'Inter', Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-base);
  margin: 0;
  color: var(--text-dark);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1rem 1rem 3rem;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 20;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.8rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.logo {
  font-weight: 700;
  text-decoration: none;
  color: var(--accent);
  font-size: 1.5rem;
  letter-spacing: 0.03em;
}

.nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #444;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav a:hover,
.nav a:focus {
  color: var(--accent);
}

.cart-btn {
  background: transparent;
  border: 1.5px solid #ccc;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  color: #555;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.cart-btn:hover,
.cart-btn:focus {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.hero {
  text-align: center;
  padding: 3rem 1rem 4rem;
  font-size: 1.25rem;
  color: #555;
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.5;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.2rem;
}

.card {
  background: #fff;
  border: 1px solid var(--border-light);
  padding: 1rem;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
  transition: box-shadow 0.3s ease;
  cursor: pointer;
}

.card:hover,
.card:focus-within {
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: calc(var(--radius) - 2px);
  margin-bottom: 1rem;
  transition: transform 0.3s ease;
}

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

.price {
  font-weight: 700;
  margin: 0.4rem 0 1rem;
  font-size: 1.1rem;
  color: var(--accent-dark);
}

.card-actions {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.buyBtn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.55rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 700;
  font-size: 1rem;
  transition: background-color 0.3s ease;
  flex-grow: 1;
  text-align: center;
}

.buyBtn:hover,
.buyBtn:focus {
  background: var(--accent-dark);
  box-shadow: 0 0 10px var(--accent-dark);
  outline: none;
}

.detail {
  text-decoration: none;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  align-self: center;
}

.detail:hover,
.detail:focus {
  text-decoration: underline;
}

.cart-panel {
  position: fixed;
  right: 12px;
  top: 70px;
  width: 340px;
  max-height: 85vh;
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-light);
  z-index: 200;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.cart-panel.hidden {
  display: none;
}

.cart-panel-inner {
  padding: 1rem 1.2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.cart-row {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.cart-row img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: calc(var(--radius) - 2px);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.cart-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  font-weight: 700;
  font-size: 1.15rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-light);
}

.order-confirm {
  padding: 2rem;
  text-align: center;
  font-size: 1.1rem;
  color: var(--accent-dark);
  font-weight: 600;
}

/* admin styles */
.admin-form label,
.admin-form input,
.admin-form textarea {
  display: block;
  margin-bottom: 10px;
  width: 100%;
  font-size: 1rem;
  font-weight: 500;
}

.admin-form input,
.admin-form textarea {
  padding: 0.6rem 0.8rem;
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius);
  transition: border-color 0.3s ease;
}

.admin-form input:focus,
.admin-form textarea:focus {
  border-color: var(--accent);
  outline: none;
}

.admin-list table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.9rem;
}

.admin-list th,
.admin-list td {
  border: 1px solid var(--border-light);
  padding: 10px 12px;
  text-align: left;
  vertical-align: middle;
}

.admin-list th {
  background: #f0f4ff;
  font-weight: 700;
  color: var(--accent-dark);
}

/* responsive */
@media (max-width: 900px) {
  .grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
  .cart-panel {
    right: 8px;
    width: 300px;
    top: 70px;
  }
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .header-inner {
    flex-direction: column;
    gap: 10px;
    padding: 1rem;
  }
  .cart-panel {
    left: 8px;
    right: 8px;
    top: 100px;
    width: auto;
    max-height: 60vh;
  }
  .cart-btn {
    width: 100%;
    justify-content: center;
    padding: 0.6rem 0;
  }
}

/* Search form */
.search-form {
  margin: 15px 0 30px;
  display: flex;
  max-width: 400px;
  width: 100%;
  box-shadow: 0 2px 8px rgba(11,114,255,0.2);
  border-radius: var(--radius);
  overflow: hidden;
}

.search-form input[type="search"] {
  flex-grow: 1;
  padding: 10px 16px;
  font-size: 1.1rem;
  border: none;
  outline: none;
  color: var(--text-dark);
  background: #fff;
}

.search-form input[type="search"]::placeholder {
  color: #aaa;
}

.search-form button {
  padding: 0 18px;
  background-color: var(--accent);
  border: none;
  color: white;
  font-size: 1.3rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-form button:hover,
.search-form button:focus {
  background-color: var(--accent-dark);
  outline: none;
}