:root {
  color-scheme: light;
  --bg: #f6f7f8;
  --surface: #ffffff;
  --surface-soft: #eef2f0;
  --line: #d9dfdc;
  --text: #17201c;
  --muted: #69736f;
  --accent: #d36f27;
  --green: #1d8a5a;
  --green-soft: #e3f4ec;
  --danger: #b74343;
  --shadow: 0 12px 30px rgba(25, 35, 31, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}

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

button {
  border: 0;
  cursor: pointer;
}

button[disabled] {
  cursor: not-allowed;
  opacity: 0.58;
}

.topbar {
  min-height: 92px;
  padding: 22px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 0;
  font-size: 28px;
}

h2 {
  margin-bottom: 18px;
  font-size: 20px;
}

.top-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.operator {
  color: var(--muted);
  font-size: 14px;
}

.primary,
.ghost {
  min-height: 38px;
  padding: 0 16px;
  border-radius: 8px;
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.primary {
  background: var(--text);
  color: #fff;
}

.ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line);
}

.primary:hover,
.ghost:hover {
  transform: translateY(-1px);
}

.tabs {
  display: flex;
  gap: 6px;
  padding: 12px 32px 0;
  overflow-x: auto;
}

.tabs button {
  flex: 0 0 auto;
  padding: 10px 14px;
  border-radius: 8px 8px 0 0;
  background: transparent;
  color: var(--muted);
}

.tabs button.active {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line);
  border-bottom-color: var(--surface);
}

main {
  padding: 28px 32px 44px;
}

.notice {
  margin: 16px 32px 0;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--surface-soft);
  color: var(--text);
}

.notice.danger {
  color: var(--danger);
  background: #fff1f1;
}

.login-band {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 34px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.login-band h2 {
  max-width: 720px;
  margin-bottom: 10px;
  font-size: 30px;
}

.login-band p:last-child {
  max-width: 780px;
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.8;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 22px;
}

.metric {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.metric strong {
  display: block;
  margin-top: 12px;
  font-size: 28px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.44fr);
  gap: 18px;
  align-items: start;
}

.split > div,
.panel,
section:not(.split):not(.metric-grid):not(.login-band) {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

.wide-left {
  grid-template-columns: minmax(0, 1fr) 360px;
}

.section-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.section-toolbar h2 {
  margin-bottom: 0;
}

.course-list {
  display: grid;
  gap: 12px;
}

.course-list article,
.course-row {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  min-height: 92px;
  padding: 12px;
  background: #fbfcfb;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.course-list.compact article {
  grid-template-columns: 76px minmax(0, 1fr) auto;
}

.course-list img,
.course-row img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 6px;
  background: var(--surface-soft);
}

.course-row p,
.course-list p {
  margin: 6px 0;
  color: var(--muted);
  line-height: 1.5;
}

.course-row small {
  color: var(--muted);
}

.row-title,
.row-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.row-title {
  flex-wrap: wrap;
}

.row-actions {
  justify-content: flex-end;
}

.price {
  color: var(--accent);
  font-weight: 800;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface-soft);
  font-size: 12px;
  font-style: normal;
}

.pill.published,
.pill.paid {
  color: var(--green);
  background: var(--green-soft);
}

.pill.pending {
  color: var(--accent);
  background: #fff3e8;
}

.pill.refunded {
  color: var(--danger);
  background: #fff1f1;
}

form {
  display: grid;
  gap: 12px;
}

.login-form {
  width: min(360px, 100%);
  grid-template-columns: 1fr auto;
  align-items: center;
}

.editor-panel {
  position: sticky;
  top: 18px;
}

.form-grid.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  background: #fff;
  color: var(--text);
  outline: none;
}

textarea {
  resize: vertical;
}

.form-help {
  margin: -2px 0 2px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--green);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

th,
td {
  padding: 13px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

th {
  color: var(--muted);
  font-size: 13px;
}

.question-list,
.rule-list,
.release-note,
.checklist,
.code-list {
  display: grid;
  gap: 12px;
}

.question-list article,
.rule-list p,
.release-note p,
.checklist p,
.code-row,
.empty {
  margin: 0;
  padding: 14px;
  background: #fbfcfb;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.code-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
}

.code-row p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.checkbox-list {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfb;
}

.checkbox-list > span {
  color: var(--muted);
  font-size: 13px;
}

.checkbox-list label {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--text);
}

.checkbox-list input {
  width: auto;
}

.question-list p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.8;
}

.checklist p {
  display: grid;
  grid-template-columns: 14px 130px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.checklist span {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--green);
}

.checklist strong {
  font-size: 14px;
}

.checklist em {
  color: var(--muted);
  font-style: normal;
}

@media (max-width: 880px) {
  .topbar,
  .login-band,
  .split,
  .wide-left {
    grid-template-columns: 1fr;
  }

  .login-form,
  .form-grid.two {
    grid-template-columns: 1fr;
  }

  .editor-panel {
    position: static;
  }

  .topbar {
    display: grid;
    gap: 14px;
    padding: 18px;
  }

  .tabs {
    padding-left: 18px;
    padding-right: 18px;
  }

  main {
    padding: 20px 18px 34px;
  }

  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .course-list article,
  .course-row {
    grid-template-columns: 88px minmax(0, 1fr);
  }

  .row-actions {
    grid-column: 1 / -1;
    justify-content: space-between;
  }
}

@media (max-width: 520px) {
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .login-band h2 {
    font-size: 24px;
  }

  .course-list article,
  .course-row {
    grid-template-columns: 1fr;
  }

  .checklist p {
    grid-template-columns: 14px minmax(0, 1fr);
  }

  .checklist em {
    grid-column: 2;
  }
}