:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #e63946;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-hover: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --radius: 16px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 20px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary);
  display: inline-block;
}

.search-wrapper {
  position: relative;
  flex: 1;
}

#search {
  width: 100%;
  padding: 15px 20px 15px 50px;
  font-size: 16px;
  border: 2px solid var(--border);
  border-radius: 50px;
  background: var(--card-bg);
  outline: none;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
}

#search:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  color: #94a3b8;
  pointer-events: none;
}

.product {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  display: flex;
  gap: 20px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  align-items: center;
}

.product:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.product img {
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: 12px;
  background: #f1f5f9;
  flex-shrink: 0;
}

.info {
  flex: 1;
}

.name {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.price {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--danger);
  margin-bottom: 10px;
}

.spec, .channel, .feature {
  color: var(--text-light);
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.channel span {
  display: inline-block;
  background: #eff6ff;
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-right: 5px;
}

.feature {
  margin-top: 6px;
  line-height: 1.5;
}

.login-box {
  max-width: 400px;
  margin: 80px auto;
  background: var(--card-bg);
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
}

.login-box h2 {
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.login-box input[type="password"] {
  width: 100%;
  padding: 14px 20px;
  font-size: 16px;
  border: 2px solid var(--border);
  border-radius: 50px;
  margin: 10px 0;
  outline: none;
  transition: border 0.3s;
}

.login-box input[type="password"]:focus {
  border-color: var(--primary);
}

.login-box button,
.admin-form button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.login-box button:hover,
.admin-form button:hover {
  background: var(--primary-dark);
}

.admin-form {
  background: var(--card-bg);
  padding: 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 30px;
}

.admin-form label {
  display: block;
  margin-top: 20px;
  font-weight: 600;
  color: var(--text);
}

.admin-form input,
.admin-form textarea {
  width: 100%;
  padding: 12px 15px;
  margin-top: 8px;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 15px;
  outline: none;
  transition: border 0.3s;
}

.admin-form input:focus,
.admin-form textarea:focus {
  border-color: var(--primary);
}

.admin-form textarea {
  resize: vertical;
}

a.button {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 8px 18px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 500;
  margin-right: 10px;
}

a.button:hover {
  background: var(--primary-dark);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-top: 20px;
}

th {
  background: #f8fafc;
  font-weight: 600;
  color: var(--text);
  padding: 14px 16px;
  text-align: left;
}

td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-light);
}

tr:last-child td {
  border-bottom: none;
}

a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  body {
    padding: 15px;
  }
  h1 {
    font-size: 1.5rem;
  }
  .product {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .product img {
    width: 100%;
    max-width: 300px;
    height: auto;
    aspect-ratio: 1/1;
    margin-bottom: 15px;
  }
  .info {
    width: 100%;
  }
  .admin-form {
    padding: 20px;
  }
}
/* 覆盖全局 body 的 padding，适应新布局 */
body { padding: 0; }
#search { border-radius: 20px; padding: 10px 15px; border: 1px solid #e0e0e0; }