:root {
  --bg: #0b1220;
  --bg-elev: #121a2b;
  --bg-soft: #182234;
  --border: #243047;
  --text: #e8eef9;
  --muted: #8b9bb8;
  --accent: #14b8a6;
  --accent-2: #2dd4bf;
  --accent-dim: rgba(20, 184, 166, 0.15);
  --danger: #f87171;
  --radius: 14px;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(20, 184, 166, 0.12), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(56, 189, 248, 0.08), transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono { font-family: var(--mono); font-size: 0.9em; }
.muted { color: var(--muted); }
.small { font-size: 0.82rem; }
.hidden { display: none !important; }
.error { color: var(--danger); font-size: 0.9rem; }

#app {
  display: grid;
  grid-template-columns: 240px minmax(0, 720px);
  gap: 0;
  max-width: 1000px;
  margin: 0 auto;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 1.5rem 1.25rem;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 1.4rem; }

.nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.nav a {
  color: var(--text);
  text-decoration: none;
  padding: 0.7rem 0.9rem;
  border-radius: 999px;
  font-weight: 550;
}
.nav a:hover { background: var(--bg-soft); text-decoration: none; }
.nav a.active { background: var(--accent-dim); color: var(--accent-2); }

.sidebar-foot { margin-top: auto; }

.main {
  border-right: 1px solid var(--border);
  min-height: 100vh;
  background: rgba(11, 18, 32, 0.35);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  background: rgba(11, 18, 32, 0.75);
}
.topbar h1 {
  margin: 0;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.view { padding: 0 0 4rem; }

.compose {
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}
.compose textarea {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
  color: var(--text);
  padding: 0.85rem 1rem;
  font: inherit;
  outline: none;
}
.compose textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }
.compose-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.75rem;
  gap: 0.75rem;
}

.btn {
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  border-radius: 999px;
  padding: 0.55rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary {
  background: linear-gradient(135deg, #0d9488, #14b8a6);
  border-color: transparent;
  color: #042f2e;
}
.btn.ghost { background: transparent; }
.btn.danger { color: var(--danger); border-color: rgba(248, 113, 113, 0.35); }
.btn.small { padding: 0.35rem 0.75rem; font-size: 0.85rem; }

.row { display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; }

.feed { display: flex; flex-direction: column; }
.post {
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s ease;
}
.post:hover { background: rgba(24, 34, 52, 0.45); }
.post-head {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.35rem;
}
.post-head .name { font-weight: 700; color: var(--text); text-decoration: none; }
.post-head .name:hover { text-decoration: underline; color: var(--accent-2); }
.post-head .handle, .post-head .time { color: var(--muted); font-size: 0.9rem; }
.post-body {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 1.02rem;
}
.post-meta {
  margin-top: 0.65rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--muted);
  font-family: var(--mono);
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
}
.badge.ok { color: var(--accent-2); border-color: rgba(45, 212, 191, 0.35); }

.profile-card {
  padding: 1.5rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(20, 184, 166, 0.08), transparent 70%);
}
.profile-card h2 { margin: 0 0 0.25rem; font-size: 1.4rem; letter-spacing: -0.02em; }
.profile-card .handle { color: var(--muted); margin-bottom: 0.75rem; }
.profile-card .bio { margin: 0 0 1rem; white-space: pre-wrap; }
.stats { display: flex; gap: 1.25rem; color: var(--muted); font-size: 0.92rem; }
.stats strong { color: var(--text); }

.panel {
  margin: 1.25rem;
  padding: 1.25rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel h3 { margin: 0 0 0.5rem; }
.panel p { margin: 0 0 1rem; color: var(--muted); }
.panel label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.panel input, .panel textarea {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  padding: 0.7rem 0.85rem;
  font: inherit;
}
.panel input:focus, .panel textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.empty {
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--muted);
}

dialog {
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--bg-elev);
  color: var(--text);
  padding: 0;
  max-width: 420px;
  width: calc(100% - 2rem);
  box-shadow: var(--shadow);
}
dialog::backdrop { background: rgba(2, 6, 16, 0.72); backdrop-filter: blur(4px); }
.auth-form { padding: 1.4rem; display: flex; flex-direction: column; gap: 0.75rem; }
.auth-form h2 { margin: 0; }
.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.88rem;
  color: var(--muted);
}
.auth-form input {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  padding: 0.7rem 0.85rem;
  font: inherit;
}
.tabs { display: flex; gap: 0.4rem; margin: 0.25rem 0; }
.tab {
  flex: 1;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 0.45rem;
  cursor: pointer;
  font: inherit;
}
.tab.active {
  background: var(--accent-dim);
  color: var(--accent-2);
  border-color: transparent;
}

.user-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.user-row .info { min-width: 0; }
.user-row .name { font-weight: 700; }
.user-row .handle { color: var(--muted); font-size: 0.9rem; }

@media (max-width: 760px) {
  #app { grid-template-columns: 1fr; }
  .sidebar {
    position: sticky;
    top: 0;
    height: auto;
    z-index: 20;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    border-right: none;
    border-bottom: 1px solid var(--border);
    background: rgba(11, 18, 32, 0.92);
    backdrop-filter: blur(10px);
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }
  .nav { flex-direction: row; flex-wrap: wrap; }
  .sidebar-foot { display: none; }
  .main { border-right: none; }
}