:root {
  --bg: #eef1f4;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #617080;
  --line: #cfd7df;
  --accent: #176b5d;
  --accent-strong: #0d5549;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --shadow: 0 18px 45px rgba(31, 41, 51, 0.1);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

button,
input,
textarea {
  font: inherit;
}

.topbar {
  min-height: 92px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 28px;
  border-bottom: 1px solid var(--line);
  background: #f9fafb;
}

.topbar h1 {
  margin: 2px 0 0;
  font-size: 28px;
  line-height: 1.15;
}

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

.topbar__actions,
.editor-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 13px;
  background: #ffffff;
  color: var(--ink);
  cursor: pointer;
}

.button:hover {
  border-color: #9aa8b6;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.button--primary {
  border-color: var(--accent-strong);
  background: var(--accent);
  color: #ffffff;
}

.button--danger {
  border-color: #f0b8b2;
  background: var(--danger-bg);
  color: var(--danger);
}

.workspace {
  height: calc(100vh - 92px);
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
}

.sidebar {
  min-height: 0;
  border-right: 1px solid var(--line);
  background: #f8fafc;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.sidebar__header {
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.sidebar__header label,
.field span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #ffffff;
  color: var(--ink);
  outline: none;
}

input {
  min-height: 38px;
  padding: 8px 10px;
}

textarea {
  resize: vertical;
  padding: 10px;
}

.field-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(23, 107, 93, 0.14);
}

.article-list {
  min-height: 0;
  overflow: auto;
  padding: 10px;
}

.article-list__empty {
  padding: 18px 8px;
  color: var(--muted);
}

.article-item {
  width: 100%;
  display: block;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 10px;
  background: transparent;
  text-align: left;
}

.article-item:hover {
  background: #eef4f6;
}

.article-item[aria-selected='true'] {
  border-color: rgba(23, 107, 93, 0.38);
  background: #e5f3f0;
}

.article-item strong {
  display: block;
  line-height: 1.25;
}

.article-item span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.editor {
  min-width: 0;
  min-height: 0;
  overflow: auto;
  padding: 22px 28px 34px;
}

.status-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}

.status-line a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.article-form {
  display: grid;
  gap: 18px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.field--wide {
  grid-column: 1 / -1;
}

.editor-tools {
  justify-content: flex-start;
}

.content-layout {
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  gap: 18px;
}

.content-field,
.preview {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.content-field {
  padding: 14px;
}

.content-field__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.content-field__header > span {
  margin-bottom: 0;
}

.markdown-toolbar {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  flex-wrap: wrap;
}

.tool-button {
  min-height: 30px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 8px;
  background: #f8fafc;
  color: var(--ink);
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
}

.tool-button:hover {
  border-color: #9aa8b6;
  background: #ffffff;
}

.content-field textarea {
  flex: 1;
  min-height: 560px;
  font-family: SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.55;
}

.preview {
  overflow: hidden;
}

.preview__cover {
  min-height: 190px;
  border-bottom: 1px solid var(--line);
  background: #f8fafc;
}

.preview__cover img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.preview iframe {
  width: 100%;
  flex: 1;
  min-height: 420px;
  border: 0;
  background: #ffffff;
}

@media (max-width: 980px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .workspace {
    height: auto;
    grid-template-columns: 1fr;
  }

  .sidebar {
    max-height: 360px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .content-layout,
  .form-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .topbar,
  .editor {
    padding-left: 16px;
    padding-right: 16px;
  }

  .topbar__actions,
  .editor-tools {
    width: 100%;
  }

  .button {
    flex: 1 1 auto;
  }

  .status-line {
    align-items: flex-start;
    flex-direction: column;
  }
}