:root {
  --bg: #0b0f14;
  --panel: #111824;
  --panel2: #0f1520;
  --text: #e7eef7;
  --muted: #9fb0c5;
  --line: rgba(255, 255, 255, 0.08);
  --accent: #ff7a18; /* Helix-ish orange vibe */
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --mono:
    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Arial,
    "Apple Color Emoji",
    "Segoe UI Emoji";
  background:
    radial-gradient(
      1200px 600px at 15% 0%,
      rgba(255, 122, 24, 0.12),
      transparent 60%
    ),
    radial-gradient(
      900px 500px at 90% 10%,
      rgba(80, 120, 255, 0.12),
      transparent 55%
    ),
    var(--bg);
  color: var(--text);
}

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(11, 15, 20, 0.65);
  border-bottom: 1px solid var(--line);
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: 0.2px;
}
.brand__dot {
  color: var(--accent);
  margin: 0 2px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 14px;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
}
.nav a:hover {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.03);
}
.nav a.active {
  color: var(--text);
  border-color: rgba(255, 122, 24, 0.35);
  background: rgba(255, 122, 24, 0.07);
}

.layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 18px;
  padding: 18px 0 26px;
}

.sidebar,
.viewer {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.03),
    rgba(255, 255, 255, 0.01)
  );
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.sidebar {
  padding: 18px;
  position: sticky;
  top: 72px; /* topbar height-ish */
  align-self: start;
}
.sidebar__head h1 {
  margin: 0 0 6px;
  font-size: 26px;
}
.muted {
  color: var(--muted);
}
.sidebar__head p {
  margin: 0 0 14px;
}

.search input {
  width: 100%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  outline: none;
}
.search input:focus {
  border-color: rgba(255, 122, 24, 0.45);
  box-shadow: 0 0 0 4px rgba(255, 122, 24, 0.12);
}

.postlist {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 62vh;
  overflow: auto;
}
.postlist li {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.18);
  padding: 12px;
  cursor: pointer;
  transition:
    transform 0.08s ease,
    border-color 0.15s ease;
}
.postlist li:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.14);
}
.postlist li.active {
  border-color: rgba(255, 122, 24, 0.55);
  background: rgba(255, 122, 24, 0.09);
}

.post-title {
  font-weight: 700;
  margin: 0 0 6px;
}
.post-sub {
  font-size: 13px;
  color: var(--muted);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.tag {
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.sidebar__foot {
  margin-top: 14px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  font-size: 13px;
}
code {
  font-family: var(--mono);
  font-size: 0.95em;
}

.viewer {
  padding: 18px;
  min-height: 70vh;
}
.postmeta {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
  margin-bottom: 12px;
}
.postmeta h2 {
  margin: 0;
  font-size: 26px;
}
.postmeta .meta {
  color: var(--muted);
  font-size: 13px;
  text-align: right;
}

.content {
  line-height: 1.65;
  font-size: 16px;
}
.content img {
  max-width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.18);
}
.content h1,
.content h2,
.content h3 {
  line-height: 1.25;
}
.content h2 {
  margin-top: 28px;
}
.content hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 18px 0;
}
.content blockquote {
  margin: 14px 0;
  padding: 12px 14px;
  border-left: 3px solid rgba(255, 122, 24, 0.65);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 12px;
}
.content pre {
  overflow: auto;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.35);
}
.content a {
  color: #9cc2ff;
}

.empty {
  padding: 24px;
  border: 1px dashed rgba(255, 255, 255, 0.16);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.02);
}

.footer {
  border-top: 1px solid var(--line);
  padding: 18px 0;
  margin-top: 10px;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: relative;
    top: 0;
  }
  .postlist {
    max-height: 40vh;
  }
}