:root,
[data-theme="dark"] {
  color-scheme: dark;
  /* 参考百度类深色页采样炭黑 #232429，纯色底（无星空图） */
  --bg-0: #232429;
  --bg-1: #2c2d34;
  --bg-2: #34353c;
  --bg-bottom: #1f2025;
  --starmap-veil: rgba(35, 36, 41, 0.52);
  --line: rgba(56, 189, 248, 0.18);
  --line-strong: rgba(56, 189, 248, 0.35);
  --text: #d7e6f5;
  --muted: #7f95ad;
  --cyan: #38bdf8;
  --cyan-bright: #7dd3fc;
  --cyan-dim: #0ea5e9;
  --danger: #fb7185;
  --ok: #34d399;
  --glow: rgba(14, 165, 233, 0.22);
  --body-radial: rgba(14, 165, 233, 0.08);
  --grid-line: rgba(56, 189, 248, 0.035);
  --header-bg: rgba(35, 36, 41, 0.78);
  --panel-bg: linear-gradient(180deg, rgba(44, 45, 52, 0.88), rgba(32, 33, 38, 0.84));
  --card-bg: linear-gradient(160deg, rgba(48, 49, 56, 0.82), rgba(35, 36, 41, 0.88));
  --article-bg: linear-gradient(165deg, rgba(42, 43, 49, 0.82), rgba(35, 36, 41, 0.88));
  --surface: rgba(42, 43, 50, 0.72);
  --code-bg: #1a1b1f;
  --input-bg: rgba(28, 29, 34, 0.9);
  --preview-bg: rgba(40, 41, 47, 0.75);
  --comment-form-bg: rgba(40, 41, 47, 0.55);
  --comment-item-bg: rgba(28, 29, 34, 0.55);
  --nav-menu-bg: rgba(40, 41, 47, 0.96);
  --tint: rgba(14, 165, 233, 0.1);
  --tint-soft: rgba(14, 165, 233, 0.08);
  --link-hover: #fff;
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.28), 0 0 24px rgba(14, 165, 233, 0.08);
  --hero-glow: rgba(56, 189, 248, 0.25);
  --radius: 10px;
  --font-display: "Orbitron", "Noto Sans SC", sans-serif;
  --font-body: "IBM Plex Sans", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --content: 960px;
  --rail: 248px;
  --rail-gap: 1.75rem;
  /* Prefer max-width over width:min(...,100%-2rem): % in custom props can
     expand with overflowing children and eat the right margin. */
  --shell-max: var(--content);
  /* 暗色同明亮：纯色底，不要星空图盖住 #232429 */
  --body-bg-image: none;
}

body.has-rail {
  --shell-max: calc(var(--content) + var(--rail) + var(--rail-gap));
}

/* Admin list/edit: wider shell so side-by-side editor is usable */
body.is-admin {
  --shell-max: 1280px;
}

[data-theme="light"] {
  color-scheme: light;
  --bg-0: #f2f7fc;
  --bg-1: #e8f1f9;
  --bg-2: #d9e7f4;
  --bg-bottom: #dce8f3;
  --starmap-veil: rgba(246, 250, 255, 0.78);
  --line: rgba(2, 132, 199, 0.2);
  --line-strong: rgba(2, 132, 199, 0.38);
  --text: #152536;
  --muted: #5a7188;
  --cyan: #0284c7;
  --cyan-bright: #0369a1;
  --cyan-dim: #0ea5e9;
  --danger: #e11d48;
  --ok: #059669;
  --glow: rgba(14, 165, 233, 0.12);
  --body-radial: rgba(14, 165, 233, 0.06);
  --grid-line: rgba(2, 132, 199, 0.05);
  --header-bg: rgba(242, 247, 252, 0.9);
  --panel-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(236, 244, 252, 0.88));
  --card-bg: linear-gradient(160deg, rgba(255, 255, 255, 0.9), rgba(232, 241, 250, 0.9));
  --article-bg: linear-gradient(165deg, rgba(255, 255, 255, 0.9), rgba(236, 244, 252, 0.88));
  --surface: rgba(255, 255, 255, 0.86);
  --code-bg: #e6eef6;
  --input-bg: rgba(255, 255, 255, 0.96);
  --preview-bg: rgba(255, 255, 255, 0.88);
  --comment-form-bg: rgba(255, 255, 255, 0.82);
  --comment-item-bg: rgba(255, 255, 255, 0.78);
  --nav-menu-bg: rgba(248, 251, 255, 0.98);
  --tint: rgba(14, 165, 233, 0.12);
  --tint-soft: rgba(14, 165, 233, 0.08);
  --link-hover: #0c4a6e;
  --card-shadow: 0 10px 28px rgba(15, 40, 70, 0.1), 0 0 18px rgba(14, 165, 233, 0.06);
  --hero-glow: rgba(2, 132, 199, 0.18);
  /* data-theme 挂在 <html>；明亮主题用浅色纯底，不要星空图 */
  --body-bg-image: none;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-body);
  background-color: var(--bg-0);
  background-image: var(--body-bg-image);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  line-height: 1.65;
  position: relative;
}

@media (max-width: 768px) {
  body {
    background-attachment: scroll;
  }
}

a {
  color: var(--cyan-bright);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.bg-glow {
  position: fixed;
  width: 420px;
  height: 420px;
  right: -80px;
  top: 10%;
  border-radius: 50%;
  background: var(--glow);
  filter: blur(80px);
  pointer-events: none;
  z-index: -1;
  animation: pulse-glow 8s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.45; transform: scale(1); }
  50% { opacity: 0.75; transform: scale(1.08); }
}

.shell {
  /* padding sits outside --shell-max so the reading column stays ≈960px */
  width: 100%;
  max-width: calc(var(--shell-max) + 2rem);
  margin-inline: auto;
  padding-inline: 1rem;
  box-sizing: border-box;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.85rem;
  position: relative;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--cyan);
  cursor: pointer;
  padding: 0;
  transition: border-color 0.2s, color 0.2s, box-shadow 0.2s, background 0.2s;
}

.theme-toggle:hover {
  color: var(--cyan-bright);
  border-color: var(--line-strong);
  background: var(--tint-soft);
  box-shadow: 0 0 14px var(--glow);
}

.theme-icon {
  width: 1.15rem;
  height: 1.15rem;
  display: block;
}

[data-theme="dark"] .theme-icon-moon,
[data-theme="light"] .theme-icon-sun {
  display: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
}

.brand-mark {
  color: var(--cyan);
  font-size: 1.35rem;
  text-shadow: 0 0 12px var(--glow);
  animation: mark-flicker 5s ease-in-out infinite;
}

@keyframes mark-flicker {
  0%, 100% { opacity: 1; }
  48% { opacity: 1; }
  50% { opacity: 0.55; }
  52% { opacity: 1; }
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: 1.05rem;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.site-nav a,
.link-btn {
  color: var(--muted);
  font-size: 0.92rem;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  font-family: inherit;
}

.site-nav a:hover,
.link-btn:hover {
  color: var(--cyan-bright);
}

.inline-form {
  display: inline;
  margin: 0;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  padding: 8px;
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--cyan);
}

.main-shell {
  padding-block: 2rem 4rem;
  min-height: calc(100vh - 140px);
}

.main-shell.has-rail {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: var(--rail-gap);
  align-items: start;
}

.main-col {
  min-width: 0;
  overflow-x: clip;
}

.site-rail {
  position: sticky;
  top: 4.6rem;
  display: grid;
  gap: 0.85rem;
}

.rail-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-bg);
  padding: 0.85rem 0.9rem 0.95rem;
  box-shadow: inset 2px 0 0 var(--cyan-dim);
}

.rail-title {
  margin: 0 0 0.7rem;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  font-weight: 500;
}

.rail-empty {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.rail-stat {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.rail-stat-label {
  color: var(--muted);
  font-size: 0.82rem;
}

.rail-stat-value {
  color: var(--cyan-bright);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.rail-stat-unit {
  color: var(--muted);
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.rail-toc {
  display: grid;
  gap: 0.15rem;
}

.toc-link {
  display: block;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.84rem;
  line-height: 1.4;
  padding: 0.28rem 0.4rem;
  border-radius: 6px;
  border-left: 2px solid transparent;
}

.toc-link:hover,
.toc-link.is-active {
  color: var(--cyan-bright);
  background: var(--tint);
  border-left-color: var(--cyan);
}

.toc-l3 {
  padding-left: 0.95rem;
  font-size: 0.8rem;
}

.rail-cats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.2rem;
}

.rail-cat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.86rem;
  padding: 0.32rem 0.45rem;
  border-radius: 6px;
}

.rail-cat:hover,
.rail-cat.is-active {
  color: var(--cyan-bright);
  background: var(--tint);
}

.rail-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan-dim);
}

.rail-comments {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.rail-comment {
  display: grid;
  gap: 0.15rem;
  color: inherit;
  padding: 0.35rem 0.2rem;
  border-radius: 6px;
}

.rail-comment:hover {
  background: var(--tint-soft);
}

.rail-comment-meta {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--muted);
}

.rail-comment-author {
  color: var(--cyan-bright);
}

.rail-comment-body {
  font-size: 0.84rem;
  line-height: 1.4;
}

.rail-comment-post {
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hero {
  padding: 1.5rem 0 2rem;
  animation: rise-in 0.7s ease-out both;
}

@keyframes rise-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.eyebrow {
  margin: 0 0 0.6rem;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
}

.hero-brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.2rem);
  letter-spacing: 0.04em;
  line-height: 1.15;
  text-shadow: 0 0 28px var(--hero-glow);
}

.hero-lead {
  margin: 0.85rem 0 0;
  color: var(--muted);
  max-width: 36rem;
  font-size: 1.05rem;
}

.tag-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.82rem;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.tag:hover,
.tag.is-active {
  color: var(--cyan-bright);
  border-color: var(--line-strong);
  background: var(--tint);
}

.tag.sm {
  font-size: 0.75rem;
  padding: 0.15rem 0.55rem;
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.post-item {
  min-width: 0;
  max-width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card-bg);
  padding: 1.15rem 1.25rem 1rem;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  animation: rise-in 0.55s ease-out both;
  overflow-wrap: anywhere;
}

.post-item:nth-child(2) { animation-delay: 0.05s; }
.post-item:nth-child(3) { animation-delay: 0.1s; }
.post-item:nth-child(4) { animation-delay: 0.15s; }

.post-item:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  box-shadow: var(--card-shadow);
}

.post-link {
  color: inherit;
  display: block;
  min-width: 0;
  max-width: 100%;
}

.post-link time {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--cyan-dim);
}

.post-link h2 {
  margin: 0.35rem 0 0.4rem;
  font-size: 1.25rem;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.post-link p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.post-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-top: 0.75rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.post-stats {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.post-stats a {
  color: var(--muted);
}

.post-stats a:hover {
  color: var(--cyan);
}

.empty-state,
.auth-panel {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  background: var(--surface);
}

.empty-state h2,
.auth-panel h1,
.admin-header h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  letter-spacing: 0.03em;
}

/* 文章阅读页标题用正文字体，英文不再走 Orbitron */
.article-header h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.25;
}

.muted {
  color: var(--muted);
}

.article {
  animation: rise-in 0.55s ease-out both;
  background: var(--article-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem 1.4rem;
  box-shadow: var(--card-shadow);
}

.back-link {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.article-meta {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin: 0.75rem 0;
}

.article-views {
  color: var(--cyan);
}

.article-summary {
  color: var(--muted);
  border-left: 2px solid var(--cyan-dim);
  padding-left: 0.85rem;
  margin: 1rem 0 1.5rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  border: 1px solid var(--line);
}

.badge.draft {
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.35);
}

.badge.live {
  color: var(--ok);
  border-color: rgba(52, 211, 153, 0.35);
}

.markdown-body {
  font-size: 1.02rem;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0;
  margin-top: 1.6em;
  line-height: 1.3;
  scroll-margin-top: 5rem;
}

.markdown-body h1 { font-size: 1.6rem; }
.markdown-body h2 { font-size: 1.3rem; border-bottom: 1px solid var(--line); padding-bottom: 0.35rem; }
.markdown-body h3 { font-size: 1.1rem; }

.markdown-body p,
.markdown-body ul,
.markdown-body ol {
  margin: 0.9em 0;
}

.markdown-body a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.markdown-body blockquote {
  margin: 1.2em 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--cyan-dim);
  color: var(--muted);
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

.markdown-body pre {
  overflow-x: auto;
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--code-bg);
}

.markdown-body pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 0.88rem;
}

/* Block + auto margins: center images and prevent text wrapping beside them.
   CSDN-migrated md often packs text + img into one <p>; keep img as block
   (float:none; clear:both) so copy does not wrap beside it.
   Do NOT use display:flex; flex-direction:column on that <p> — each child
   (text, span.math, img) becomes a flex item and inline math like $R_o$
   breaks onto its own line. Prefer blank lines around images in source md. */
.markdown-body img {
  display: block;
  float: none;
  clear: both;
  max-width: 100%;
  height: auto;
  margin-block: 1rem;
  margin-inline: auto;
  border-radius: 6px;
}

/* Linked images: center the anchor itself (no flex parent needed). */
.markdown-body p > a:has(> img) {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin-inline: auto;
}

.markdown-body p > a:has(> img) > img {
  margin-inline: 0;
}

.markdown-body .katex {
  color: inherit;
}

.markdown-body div.math,
.markdown-body .katex-display {
  margin: 1.1rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.92rem;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--line);
  padding: 0.45rem 0.65rem;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--text);
  padding: 0.55rem 1rem;
  font-family: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
}

.btn:hover {
  color: var(--link-hover);
  border-color: var(--line-strong);
}

.btn.primary {
  background: linear-gradient(135deg, var(--tint), var(--tint-soft));
  border-color: var(--line-strong);
  color: var(--cyan-bright);
  box-shadow: 0 0 18px var(--glow);
}

.btn.ghost {
  background: transparent;
}

.btn.danger {
  color: var(--danger);
  border-color: rgba(251, 113, 133, 0.35);
  background: rgba(251, 113, 133, 0.08);
}

.btn.sm {
  padding: 0.3rem 0.65rem;
  font-size: 0.8rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.flash {
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid rgba(52, 211, 153, 0.35);
  background: rgba(52, 211, 153, 0.08);
  border-radius: 8px;
  color: var(--ok);
}

.admin-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

.admin-table th,
.admin-table td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.admin-table th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-family: var(--font-mono);
}

.admin-table tr:last-child td {
  border-bottom: 0;
}

.slug-hint {
  color: var(--muted);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  margin-top: 0.2rem;
}

.actions {
  display: flex;
  gap: 0.45rem;
  align-items: center;
}

.actions form {
  margin: 0;
}

.form-stack {
  display: grid;
  gap: 1rem;
}

.form-stack label {
  display: grid;
  gap: 0.35rem;
}

.form-stack label > span:first-child {
  color: var(--muted);
  font-size: 0.85rem;
}

.form-stack input[type="text"],
.form-stack input[type="email"],
.form-stack input[type="password"],
.form-stack textarea,
.form-stack input:not([type]) {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  padding: 0.65rem 0.8rem;
  font: inherit;
}

.form-stack textarea {
  resize: vertical;
  min-height: 80px;
}

.md-editor {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.55;
  min-height: 360px;
}

.form-stack input:focus,
.form-stack textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px var(--tint);
}

.checkbox {
  display: flex !important;
  align-items: center;
  gap: 0.55rem;
  grid-template-columns: none;
}

.checkbox input {
  width: auto;
}

.field-error,
.form-error {
  color: var(--danger);
  font-size: 0.85rem;
}

.form-error ul {
  margin: 0;
  padding-left: 1.1rem;
}

.auth-panel {
  max-width: 420px;
  margin: 1rem auto;
}

.editor-layout {
  display: grid;
  /* minmax(0, 1fr) lets tracks shrink; plain 1fr is minmax(auto, 1fr)
     and wide preview content would steal width from the form column */
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
}

.editor-fields {
  min-width: min(100%, 20rem);
}

.preview-pane {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  background: var(--preview-bg);
  min-height: 320px;
  min-width: 0;
  overflow-x: auto;
  position: sticky;
  top: 5rem;
}

.preview-pane h2 {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.comments {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.comments-title {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}

.comments-note {
  margin: 0 0 1rem;
  font-size: 0.9rem;
}

.flash-error {
  border-color: rgba(251, 113, 133, 0.4);
  background: rgba(251, 113, 133, 0.08);
  color: var(--danger);
}

.comment-form {
  margin-bottom: 1.75rem;
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--comment-form-bg);
}

.comment-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.comment-form em {
  color: var(--cyan);
  font-style: normal;
}

.comment-hint,
.comments-empty {
  margin: 0.35rem 0 0;
  font-size: 0.82rem;
}

.hp-field {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.comment-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.comment-item {
  padding: 0.95rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--comment-item-bg);
}

.comment-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.65rem 1rem;
  margin-bottom: 0.55rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.comment-author {
  font-family: var(--font-display);
  color: var(--cyan-bright);
  letter-spacing: 0.03em;
}

.comment-delete {
  margin-left: auto;
}

.comment-body {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.65;
  color: var(--text);
}

@media (max-width: 720px) {
  .comment-form-row {
    grid-template-columns: 1fr;
  }
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 0.4rem 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.35;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
}

.footer-inner {
  display: flex;
  align-items: center;
}

.footer-meta {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 0.85rem;
}

.footer-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}

@media (max-width: 900px) {
  .main-shell.has-rail {
    grid-template-columns: 1fr;
  }

  .site-rail {
    position: static;
    order: 2;
  }

  .main-col {
    order: 1;
  }
}

@media (max-width: 860px) {
  .editor-layout {
    grid-template-columns: 1fr;
  }

  .preview-pane {
    position: static;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    right: 1rem;
    top: 64px;
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 0.9rem 1rem;
    background: var(--nav-menu-bg);
    border: 1px solid var(--line);
    border-radius: 10px;
    min-width: 160px;
  }

  .site-nav.is-open {
    display: flex;
  }

  .admin-header {
    flex-direction: column;
  }

  .hero {
    padding-top: 0.75rem;
  }

  .site-footer {
    padding: 0.35rem 0;
  }

  .footer-meta {
    gap: 0.1rem 0.6rem;
  }
}
