* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, "Microsoft YaHei", sans-serif; background: #eef2f5; color: #1f2933; }
a { color: inherit; text-decoration: none; }
.login-page { min-height: 100vh; display: grid; place-items: center; background: linear-gradient(135deg, #eef2f5, #ffffff); }
.login-card { width: min(420px, calc(100vw - 32px)); background: #fff; padding: 32px; border-radius: 8px; box-shadow: 0 20px 45px rgba(31,41,51,.14); }
.login-card h1 { margin: 0 0 24px; }
.admin-header { position: sticky; top: 0; z-index: 10; height: 58px; display: flex; align-items: center; justify-content: space-between; padding: 0 28px; background: #243238; color: #fff; box-shadow: 0 8px 24px rgba(0,0,0,.12); }
.admin-header strong { font-size: 18px; }
.admin-header nav { display: flex; gap: 18px; font-size: 14px; }
.admin-main { max-width: 1120px; margin: 26px auto; padding: 0 20px 48px; }
form { margin: 0; }
section { background: #fff; border: 1px solid #dfe7e5; border-radius: 8px; padding: 22px; margin-bottom: 20px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 18px; border-bottom: 1px solid #eef2f2; padding-bottom: 14px; }
.section-head h2 { margin: 0; font-size: 20px; }
.section-head p, section > p, .hint { margin: 0; color: #687782; font-size: 13px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
label { display: block; margin: 0 0 16px; font-weight: 700; color: #2f3a43; }
label span { display: block; margin-bottom: 7px; font-size: 13px; }
input, textarea, select { width: 100%; padding: 10px 12px; border: 1px solid #cdd8d6; border-radius: 4px; font: inherit; background: #fff; }
input[type="color"] { height: 42px; padding: 4px; }
input[type="file"] { padding: 9px; background: #f8faf9; }
textarea { min-height: 72px; resize: vertical; line-height: 1.55; }
button, .save { border: 0; border-radius: 4px; background: #ac121d; color: #fff; padding: 12px 22px; font-size: 16px; cursor: pointer; }
.save { position: sticky; bottom: 18px; box-shadow: 0 10px 24px rgba(172,18,29,.22); }
.error { color: #b42318; background: #fff0ed; padding: 10px 12px; border-radius: 4px; }
.admin-products { display: grid; gap: 18px; }
.admin-product { display: grid; grid-template-columns: 210px 1fr; gap: 18px; padding: 16px; border: 1px solid #e5ecea; border-radius: 6px; background: #fbfcfc; }
.product-preview { height: 168px; display: grid; place-items: center; background: #fff; border: 1px solid #e8eeee; overflow: hidden; }
.product-preview img { width: 100%; height: 100%; object-fit: contain; }
.product-preview span { color: #87949d; font-size: 13px; }
.product-fields label:last-child { margin-bottom: 0; }
.admin-news { display: grid; gap: 16px; }
.news-edit { padding: 16px; border: 1px solid #e5ecea; border-radius: 6px; background: #fbfcfc; }
@media (max-width: 760px) {
  .admin-header { padding: 0 16px; }
  .admin-main { padding: 0 14px 42px; }
  .section-head { display: block; }
  .section-head p { margin-top: 6px; }
  .form-grid, .admin-product { grid-template-columns: 1fr; }
  .product-preview { height: 220px; }
}