:root {
  --bg: #0f1312;
  --panel: #171c1b;
  --panel-strong: #202725;
  --line: #2b3432;
  --text: #e0e5e2;
  --muted: #8e9996;
  --accent: #ff624d;
  --accent-dark: #b51f12;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

.admin-shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 42px 0;
}

.brand-dot {
  width: 46px;
  height: 46px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  background: linear-gradient(135deg, #ff7b55, #d72514);
  color: #fff;
  font-size: 22px;
  font-weight: 900;
}

.login-panel {
  width: min(520px, 100%);
  margin: 9vh auto 0;
  padding: 34px;
  border: 1px solid var(--line);
  background: var(--panel);
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 8px;
  font-size: 30px;
}

h2 {
  margin-bottom: 0;
  font-size: 22px;
}

p {
  color: var(--muted);
}

.admin-form {
  display: grid;
  gap: 16px;
}

.admin-form label {
  display: grid;
  gap: 8px;
  color: #c8d0ce;
  font-weight: 800;
}

.admin-form .checkbox-row {
  grid-template-columns: auto 1fr;
  align-items: center;
  color: #aeb8b5;
  font-size: 14px;
}

.admin-form .checkbox-row input {
  width: auto;
}

.admin-form input,
.admin-form select,
.admin-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  outline: 0;
  background: #111615;
  color: var(--text);
  padding: 12px 13px;
  transition: border-color 300ms var(--ease), box-shadow 300ms var(--ease);
}

.admin-form textarea {
  resize: vertical;
}

.admin-form input:focus,
.admin-form select:focus,
.admin-form textarea:focus {
  border-color: rgba(255, 98, 77, 0.7);
  box-shadow: 0 0 0 3px rgba(255, 98, 77, 0.13);
}

button,
.header-actions a {
  border: 0;
  background: var(--accent-dark);
  color: #fff;
  padding: 12px 16px;
  font-weight: 900;
  text-decoration: none;
  cursor: pointer;
  transition: transform 300ms var(--ease), background-color 300ms var(--ease);
}

button:hover,
.header-actions a:hover {
  transform: translateY(-1px);
  background: #d62b19;
}

.hint,
.status {
  margin: 0;
  font-size: 13px;
}

.is-hidden {
  display: none !important;
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
}

.admin-header > div:first-child {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 14px;
  align-items: center;
}

.admin-header p {
  grid-column: 2;
  margin-bottom: 0;
}

.header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.editor-layout {
  display: grid;
  grid-template-columns: minmax(320px, 430px) 1fr;
  gap: 24px;
  align-items: start;
}

.material-form,
.material-list {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 22px;
}

.form-title,
.list-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.form-title button,
.list-head button,
.header-actions button {
  background: #2a3230;
}

.two-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.cover-preview {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
  background: #111615;
}

.list {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.material-item {
  display: grid;
  grid-template-columns: 148px 1fr auto;
  gap: 16px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.025);
}

.material-item img {
  width: 148px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.material-item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.35;
}

.material-item p {
  margin-bottom: 8px;
  font-size: 13px;
  line-height: 1.5;
}

.tag {
  display: inline-flex;
  padding: 3px 8px;
  background: rgba(255, 98, 77, 0.12);
  color: #ffd5cf;
  font-size: 12px;
  font-weight: 900;
}

.item-actions {
  display: grid;
  align-content: start;
  gap: 8px;
}

.item-actions button {
  min-width: 72px;
  padding: 9px 11px;
}

.item-actions .delete {
  background: #3b2020;
}

@media (max-width: 860px) {
  .admin-header,
  .editor-layout {
    grid-template-columns: 1fr;
  }

  .admin-header {
    display: grid;
  }

  .header-actions {
    justify-content: flex-start;
  }

  .material-item {
    grid-template-columns: 1fr;
  }

  .material-item img {
    width: 100%;
  }
}