:root {
  --bg: #f3efe6;
  --paper: #fffaf2;
  --ink: #1c2430;
  --muted: #5c6675;
  --line: #d7d0c3;
  --accent: #0f6a5a;
  --accent-soft: #d8efe9;
  --sidebar: #1f2a36;
  --sidebar-text: #e8eef5;
  --sidebar-muted: #9aa8b8;
  --shadow: 0 12px 40px rgba(28, 36, 48, 0.08);
  --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: Georgia, "Songti SC", "SimSun", serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(15, 106, 90, 0.08), transparent 28%),
    linear-gradient(180deg, #efe8db 0%, var(--bg) 45%, #e7e1d5 100%);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #0a4f43;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  min-height: 100vh;
}

.main {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 2rem 2.1rem 2.4rem;
}

.sidebar {
  background: var(--sidebar);
  color: var(--sidebar-text);
  border-radius: 18px;
  padding: 1.4rem 1.1rem;
  box-shadow: var(--shadow);
  height: fit-content;
  position: sticky;
  top: 1.25rem;
}

.brand {
  display: block;
  padding: 0.35rem 0.75rem 1rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.02em;
  color: var(--sidebar-text);
  text-decoration: none;
}

.brand span {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--sidebar-muted);
  letter-spacing: 0;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.nav a {
  display: block;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  color: var(--sidebar-text);
  text-decoration: none;
  background: transparent;
  border: 1px solid transparent;
}

.nav a:hover,
.nav a.active {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.eyebrow {
  margin: 0 0 0.6rem;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  line-height: 1.25;
}

h2 {
  margin: 2rem 0 0.8rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
}

.lead {
  margin: 0 0 1.4rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.meta {
  margin: 0 0 0.55rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 0.75rem;
}

.tag {
  display: inline-block;
  padding: 0.18rem 0.55rem;
  border-radius: 6px;
  background: var(--accent-soft);
  border: 1px solid #b7ddd4;
  color: #0a4f43;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
}

a.tag:hover {
  background: #c7e8e0;
  color: #063c33;
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.post-list li {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  background: rgba(255, 255, 255, 0.55);
}

.post-list a.title {
  display: inline-block;
  margin-bottom: 0.35rem;
  font-size: 1.15rem;
  font-weight: 650;
  color: var(--ink);
  text-decoration: none;
}

.post-list a.title:hover {
  color: var(--accent);
}

.post-list .summary {
  margin: 0.4rem 0 0;
  color: var(--muted);
}

.panel {
  margin-top: 1.75rem;
  padding: 1.1rem 1.2rem;
  border-radius: 14px;
  background: var(--accent-soft);
  border: 1px solid #b7ddd4;
}

.panel h2 {
  margin-top: 0;
}

.panel ol {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
}

.panel code,
.prose code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92em;
  background: rgba(28, 36, 48, 0.06);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.prose p,
.prose ul,
.prose ol {
  margin: 0 0 1rem;
}

.prose ul,
.prose ol {
  padding-left: 1.3rem;
}

.prose h1:first-child {
  display: none;
}

.md-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.2rem;
  font-size: 0.95rem;
}

.md-table th,
.md-table td {
  border: 1px solid var(--line);
  padding: 0.55rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

.md-table th {
  background: rgba(15, 106, 90, 0.08);
  font-weight: 650;
  white-space: nowrap;
}

.md-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.45);
}

.ai-brief {
  margin: 2rem 0 1.5rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: linear-gradient(180deg, #f7fbf9 0%, #fffaf2 100%);
}

.ai-brief-head {
  padding: 0.9rem 1.1rem 0.7rem;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 106, 90, 0.06);
}

.ai-label {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
}

.ai-sub {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.ai-table {
  width: 100%;
  border-collapse: collapse;
}

.ai-table th,
.ai-table td {
  padding: 0.85rem 1.1rem;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.ai-table tr:last-child th,
.ai-table tr:last-child td {
  border-bottom: none;
}

.ai-table th {
  width: 5.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 650;
  white-space: nowrap;
}

.ai-points {
  margin: 0;
  padding-left: 1.15rem;
}

.ai-points li {
  margin: 0.2rem 0;
}

.footer-note {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 1rem;
  }

  .sidebar {
    position: static;
    order: -1;
  }

  .nav {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .main {
    padding: 1.4rem 1.2rem 1.8rem;
  }
}