:root {
  --bg: #f3ecdf;
  --paper: rgba(255, 251, 245, 0.9);
  --paper-strong: rgba(255, 251, 245, 0.98);
  --ink: #241d15;
  --muted: #6c5e50;
  --line: rgba(36, 29, 21, 0.12);
  --accent: #1b5d49;
  --accent-soft: #dbe9e2;
  --shadow: 0 24px 72px rgba(69, 45, 16, 0.14);
  --code-bg: #171410;
  --code-fg: #f8f2e8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.72), transparent 24%),
    radial-gradient(circle at right 10% top 20%, rgba(27, 93, 73, 0.12), transparent 24%),
    linear-gradient(135deg, var(--bg), #ddd0be);
}

a {
  color: var(--accent);
}

code,
pre {
  font-family: "SFMono-Regular", "Menlo", "Monaco", monospace;
}

.viewer-shell {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 36px;
}

.viewer-topbar,
.sidebar-card,
.viewer-article {
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: 28px;
  background: var(--paper);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.viewer-topbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  padding: 24px;
}

.viewer-kicker,
.sidebar-kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
}

.viewer-topbar h1 {
  margin: 10px 0 0;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 0.98;
}

.viewer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.viewer-actions a,
.sidebar-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
  text-decoration: none;
  font-weight: 700;
}

.viewer-main {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.viewer-sidebar {
  display: grid;
  gap: 16px;
  align-content: start;
}

.sidebar-card {
  padding: 18px;
}

.sidebar-links {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.sidebar-links a {
  justify-content: flex-start;
}

.sidebar-tips {
  margin: 14px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.viewer-article {
  padding: 28px;
  background: var(--paper-strong);
}

.loading {
  margin: 0;
  color: var(--muted);
}

.rendered-markdown {
  line-height: 1.75;
}

.rendered-markdown > :first-child {
  margin-top: 0;
}

.rendered-markdown h1,
.rendered-markdown h2,
.rendered-markdown h3,
.rendered-markdown h4,
.rendered-markdown h5,
.rendered-markdown h6 {
  margin: 1.6em 0 0.55em;
  line-height: 1.15;
}

.rendered-markdown h1 {
  font-size: clamp(32px, 4vw, 48px);
}

.rendered-markdown h2 {
  font-size: clamp(24px, 3vw, 34px);
  padding-bottom: 0.28em;
  border-bottom: 1px solid var(--line);
}

.rendered-markdown h3 {
  font-size: 24px;
}

.rendered-markdown p,
.rendered-markdown li,
.rendered-markdown td,
.rendered-markdown th {
  font-size: 16px;
}

.rendered-markdown p,
.rendered-markdown ul,
.rendered-markdown ol,
.rendered-markdown pre,
.rendered-markdown table,
.rendered-markdown blockquote {
  margin: 1em 0;
}

.rendered-markdown ul,
.rendered-markdown ol {
  padding-left: 1.5em;
}

.rendered-markdown code {
  padding: 0.15em 0.38em;
  border-radius: 8px;
  background: rgba(27, 93, 73, 0.1);
  font-size: 0.92em;
}

.rendered-markdown pre {
  padding: 16px;
  border-radius: 20px;
  background: var(--code-bg);
  color: var(--code-fg);
  overflow: auto;
}

.rendered-markdown pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.rendered-markdown table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid var(--line);
}

.rendered-markdown th,
.rendered-markdown td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.rendered-markdown th {
  text-align: left;
  background: var(--accent-soft);
}

.rendered-markdown tr:last-child td {
  border-bottom: 0;
}

.rendered-markdown hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2em 0;
}

@media (max-width: 980px) {
  .viewer-main {
    grid-template-columns: 1fr;
  }

  .viewer-topbar {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .viewer-shell {
    width: min(100% - 18px, 100%);
    padding: 14px 0 24px;
  }

  .viewer-topbar,
  .sidebar-card,
  .viewer-article {
    padding: 18px;
    border-radius: 22px;
  }
}