:root {
  --bg-color: #0E0F12;
  --surface-color: #1A1C21;
  --border-color: #2C2E33;
  --text-main: #F2F2F0;
  --text-muted: #A8A9A4;
  --accent: #FF6B1A;
  --accent-hover: #FF8A45;
  --code-bg: #090A0C;
  --table-border: #2C2E33;
  --table-zebra: #15171B;
  --warning-bg: #2A2118;
  --warning-border: #FF6B1A;
  --warning-text: #F2F2F0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 36px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.brand-text h1,
.brand-text .brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
}

.brand-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}

nav {
  display: flex;
  gap: 16px;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

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

h1, h2, h3, h4 {
  color: var(--text-main);
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: 2rem; margin-top: 0.5em; }
h2 { font-size: 1.4rem; border-bottom: 1px solid var(--border-color); padding-bottom: 8px; }
h3 { font-size: 1.15rem; }

p, ul, ol {
  margin-bottom: 1.2em;
}

ul, ol {
  padding-left: 24px;
}

li {
  margin-bottom: 6px;
}

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

a:hover {
  text-decoration: underline;
}

.notice-box {
  background: var(--surface-color);
  border-left: 4px solid var(--accent);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  font-size: 0.95rem;
}

.caveat-box {
  background: var(--warning-bg);
  border-left: 4px solid var(--warning-border);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  font-size: 0.95rem;
  color: var(--warning-text);
}

.table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

th, td {
  padding: 12px 14px;
  border: 1px solid var(--table-border);
}

th {
  background-color: var(--surface-color);
  color: var(--text-main);
  font-weight: 600;
}

tr:nth-child(even) {
  background-color: var(--table-zebra);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--accent);
  border: 1px solid var(--border-color);
}

.post-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 20px;
  transition: transform 0.2s, border-color 0.2s;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.post-card h2 {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
}

.post-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

footer {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer .footer-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}

footer p {
  margin-bottom: 0;
}

.video-frame {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  margin: 24px 0 28px;
}

.video-frame iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

@media (max-width: 640px) {
  .container { padding: 20px 16px; }
  header { flex-direction: column; align-items: flex-start; gap: 16px; }
  nav { flex-wrap: wrap; }
}