/* ────────────────────────────────────────────────────────────────────────────
   Marslogin Blog — Minimal CSS
   Font stack: System UI with good Chinese fallbacks
   ──────────────────────────────────────────────────────────────────────────── */

:root {
  --bg:        #ffffff;
  --bg2:       #f8f8f8;
  --border:    #e8e8e8;
  --text:      #333333;
  --text-mild: #666666;
  --text-faint:#999999;
  --accent:    #2c5eba;
  --accent-h:  #1a3f8f;
  --danger:    #c0392b;
  --success:   #27ae60;
  --warn:      #e67e22;
  --radius:    4px;
  --max-w:     780px;
  --sidebar-w: 200px;
  --gap:       2rem;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
          "WenQuanYi Micro Hei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; color: var(--accent-h); }

img { max-width: 100%; height: auto; display: block; }

/* ── Layout ─────────────────────────────────────────────────────────────────── */

.container {
  width: 100%;
  max-width: calc(var(--max-w) + var(--sidebar-w) + var(--gap) + 2rem);
  margin: 0 auto;
  padding: 0 1rem;
}

main.container { padding-top: 2rem; padding-bottom: 3rem; flex: 1; }

.page-layout {
  display: flex;
  gap: var(--gap);
  align-items: flex-start;
}

.main-col { flex: 1; min-width: 0; }

.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
}

/* ── Header ─────────────────────────────────────────────────────────────────── */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .02em;
}
.site-logo:hover { text-decoration: none; color: var(--accent); }

.site-nav { display: flex; gap: 1.25rem; align-items: center; }
.site-nav a {
  color: var(--text-mild);
  font-size: .95rem;
}
.site-nav a:hover { color: var(--accent); text-decoration: none; }

.lang-menu {
  position: relative;
}
.lang-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-mild);
  cursor: pointer;
  list-style: none;
}
.lang-trigger::-webkit-details-marker { display: none; }
.lang-trigger::marker { content: ""; }
.lang-trigger svg {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}
.lang-trigger:hover,
.lang-menu[open] .lang-trigger {
  border-color: var(--accent);
  color: var(--accent);
}
.lang-options {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + .4rem);
  min-width: 8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 20px rgba(0,0,0,.08);
  padding: .35rem 0;
  z-index: 20;
}
.lang-menu[open] .lang-options {
  display: block;
}
.lang-options a {
  display: block;
  padding: .35rem .75rem;
  color: var(--text-mild);
  white-space: nowrap;
}
.lang-options a:hover,
.lang-options a.active {
  background: var(--bg2);
  color: var(--accent);
  text-decoration: none;
}

/* ── Footer ─────────────────────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  text-align: center;
  font-size: .85rem;
  color: var(--text-faint);
}

/* ── Post list ──────────────────────────────────────────────────────────────── */

.post-list { list-style: none; }

.post-item {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.post-date {
  font-size: .85rem;
  color: var(--text-faint);
  white-space: nowrap;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.post-link {
  font-size: 1rem;
  color: var(--text);
  flex: 1;
}
.post-link:hover { color: var(--accent); text-decoration: none; }

.post-cats { display: flex; gap: .35rem; flex-wrap: wrap; }

/* ── Category tag ───────────────────────────────────────────────────────────── */

.cat-tag {
  font-size: .75rem;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: .1rem .45rem;
  color: var(--text-mild);
}
.cat-tag:hover { background: var(--accent); color: #fff; border-color: var(--accent); text-decoration: none; }

/* ── Sidebar widget ─────────────────────────────────────────────────────────── */

.widget { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; }
.widget h3 { font-size: .9rem; margin-bottom: .75rem; color: var(--text-mild); text-transform: uppercase; letter-spacing: .05em; }

.cat-list { list-style: none; }
.cat-list li { padding: .25rem 0; border-bottom: 1px solid var(--border); }
.cat-list li:last-child { border-bottom: none; }
.cat-list a { color: var(--text-mild); font-size: .9rem; }
.cat-list a:hover { color: var(--accent); text-decoration: none; }

/* ── Pagination ─────────────────────────────────────────────────────────────── */

.pagination {
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  margin-top: 2rem;
  font-size: .9rem;
  color: var(--text-mild);
}

/* ── Full post ──────────────────────────────────────────────────────────────── */

.post-full { max-width: var(--max-w); }

.post-header { margin-bottom: 1.75rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border); }

.post-title { font-size: 1.75rem; font-weight: 700; line-height: 1.35; color: var(--text); }

.post-meta {
  margin-top: .5rem;
  font-size: .875rem;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
}

/* ── Post content / Markdown ─────────────────────────────────────────────────── */

.post-content { font-size: 1.0rem; line-height: 1.9; }

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  margin: 1.8rem 0 .6rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
}
.post-content h2 { font-size: 1.35rem; }
.post-content h3 { font-size: 1.15rem; }
.post-content h4 { font-size: 1.0rem; }

.post-content p { margin: .9rem 0; }

.post-content ul,
.post-content ol { margin: .8rem 0 .8rem 1.5rem; }
.post-content li { margin: .3rem 0; }

.post-content a { color: var(--accent); }

.post-content blockquote {
  margin: 1rem 0;
  padding: .75rem 1rem;
  border-left: 4px solid var(--accent);
  background: var(--bg2);
  color: var(--text-mild);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.post-content code {
  font-family: var(--mono);
  font-size: .875em;
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: .1em .35em;
  border-radius: 3px;
}

.post-content pre {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1rem 0;
  font-size: .875rem;
  line-height: 1.6;
}
.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: .9rem;
}
.post-content th,
.post-content td {
  border: 1px solid var(--border);
  padding: .4rem .75rem;
  text-align: left;
}
.post-content th { background: var(--bg2); font-weight: 600; }
.post-content tr:nth-child(even) td { background: var(--bg2); }

.post-content hr { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }

.post-content img { border-radius: var(--radius); margin: 1rem auto; }

.post-footer { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--border); font-size: .9rem; }

/* ── Page heading ────────────────────────────────────────────────────────────── */

.page-heading {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-mild);
  font-weight: 600;
}

.empty-tip { color: var(--text-faint); padding: 2rem 0; }

/* ── Comments ─────────────────────────────────────────────────────────────────── */

.comments-section {
  max-width: var(--max-w);
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.comments-title {
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  color: var(--text-mild);
}

.comment-list { list-style: none; }

.comment-item {
  padding: .9rem 0;
  border-bottom: 1px solid var(--border);
}
.comment-item:last-child { border-bottom: none; }

.comment-meta {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: .35rem;
}

.comment-author { font-weight: 600; font-size: .9rem; }
.comment-date   { font-size: .8rem; color: var(--text-faint); }

.comment-body { font-size: .95rem; line-height: 1.7; white-space: pre-wrap; word-break: break-word; }

.comment-form-wrap {
  margin-top: 2rem;
}
.comment-form-wrap h3 { font-size: 1rem; margin-bottom: 1rem; color: var(--text-mild); }

.comment-form .form-row {
  display: flex;
  gap: .75rem;
  margin-bottom: .75rem;
}
.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form textarea {
  flex: 1;
  padding: .55rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: .95rem;
  background: var(--bg);
}
.comment-form input:focus,
.comment-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(44,94,186,.1);
}
.comment-form textarea { resize: vertical; width: 100%; }
.form-hint { font-size: .8rem; color: var(--text-faint); align-self: center; }

/* Admin comment preview */
.comment-preview {
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: .875rem;
}

.ban-form-wrap { margin-bottom: 1rem; }
.inline-form { display: flex; gap: .5rem; align-items: center; }
.inline-form input[type="text"] {
  padding: .4rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: .875rem;
  width: 200px;
}
.btn-danger-outline {
  border-color: var(--danger);
  color: var(--danger);
}
.btn-danger-outline:hover { background: var(--danger); color: #fff; }

/* ════════════════════════════════════════════════════════════════════════════
   Admin styles
   ════════════════════════════════════════════════════════════════════════════ */

.admin-body { background: #f4f5f7; }

.admin-header {
  background: #1a1a2e;
  border-bottom: none;
  position: sticky;
  top: 0;
  z-index: 10;
}
.admin-header .site-logo { color: #e0e0e0; }
.admin-header .site-logo:hover { color: #fff; }
.admin-header .site-nav a { color: #b0b8d0; }
.admin-header .site-nav a:hover { color: #fff; }

.admin-page {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.admin-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.admin-toolbar h2 { font-size: 1.1rem; }

/* ── Admin table ─────────────────────────────────────────────────────────────── */

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
.admin-table th {
  background: var(--bg2);
  text-align: left;
  padding: .5rem .75rem;
  border-bottom: 2px solid var(--border);
  font-weight: 600;
  color: var(--text-mild);
  font-size: .8rem;
  text-transform: uppercase;
}
.admin-table td {
  padding: .5rem .75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.admin-table tr:hover td { background: var(--bg2); }

.actions { display: flex; gap: .5rem; align-items: center; }

.tag-pub  { color: var(--success); font-size: .8rem; font-weight: 600; }
.tag-draft{ color: var(--warn);    font-size: .8rem; font-weight: 600; }

/* ── Editor form ─────────────────────────────────────────────────────────────── */

.editor-form { max-width: 860px; }

.form-row { margin-bottom: 1rem; }
.form-row label {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  margin-bottom: .35rem;
  color: var(--text-mild);
}
.form-row label small { font-weight: 400; color: var(--text-faint); }

.form-row input[type="text"],
.form-row input[type="datetime-local"],
.form-row textarea {
  width: 100%;
  padding: .55rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: .95rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color .15s;
}
.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(44,94,186,.1);
}

.content-editor {
  font-family: var(--mono) !important;
  font-size: .875rem !important;
  line-height: 1.6;
  resize: vertical;
}

.form-row-half {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}
.form-row-half > div { flex: 1; }

.form-checks { display: flex; flex-direction: column; gap: .4rem; padding-top: 1.6rem; }
.check-label { display: flex; align-items: center; gap: .4rem; font-size: .9rem; cursor: pointer; font-weight: 400 !important; color: var(--text) !important; }
.check-label input { width: auto; }

.form-actions { display: flex; gap: .75rem; margin-top: 1.25rem; }

/* ── Buttons ─────────────────────────────────────────────────────────────────── */

.btn {
  display: inline-block;
  padding: .45rem .9rem;
  border-radius: var(--radius);
  font-size: .875rem;
  font-family: var(--font);
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  text-decoration: none;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: var(--bg2); text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-h); border-color: var(--accent-h); color: #fff; }
.btn-ghost { background: transparent; }
.btn-link { background: none; border: none; padding: 0; font-size: .875rem; font-family: var(--font); cursor: pointer; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { text-decoration: underline; }

/* ── Login page ──────────────────────────────────────────────────────────────── */

.login-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #f4f5f7;
}

.login-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem 2.5rem;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
}

.login-box h1 { font-size: 1.3rem; margin-bottom: 1.25rem; text-align: center; }

.login-box label {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  margin-bottom: .3rem;
  color: var(--text-mild);
}

.login-box input[type="password"] {
  width: 100%;
  padding: .6rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  margin-bottom: 1rem;
}
.login-box input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(44,94,186,.1); }

.login-box button {
  width: 100%;
  padding: .65rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
.login-box button:hover { background: var(--accent-h); }

/* ── Flash / error messages ──────────────────────────────────────────────────── */

.flash-msg {
  padding: .55rem 1rem;
  border-radius: var(--radius);
  font-size: .875rem;
  margin-bottom: 1rem;
}
.flash-ok   { background: #eafaf1; color: var(--success); border: 1px solid #a9dfbf; }
.flash-warn { background: #fef9e7; color: var(--warn);    border: 1px solid #f9e79f; }
.error-msg  { background: #fdedec; color: var(--danger);  border: 1px solid #f5b7b1; border-radius: var(--radius); padding: .55rem 1rem; font-size: .875rem; margin-bottom: 1rem; }

/* ── Responsive ──────────────────────────────────────────────────────────────── */

@media (max-width: 680px) {
  .page-layout { flex-direction: column; }
  .sidebar { width: 100%; }
  .post-title { font-size: 1.4rem; }
  .admin-table th:nth-child(2),
  .admin-table td:nth-child(2) { display: none; }
  .form-row-half { flex-direction: column; }
}