:root {
  --bg: #0e1621;
  --panel: #17212b;
  --panel2: #232e3c;
  --ink: #f5f5f5;
  --muted: #6d7883;
  --line: #0e1621;
  --accent: #2aabee;
  --accent-dim: #229ed9;
  --mine: #2b5278;
  --font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --sidebar-w: 280px;
  --radius: 12px;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; color: var(--ink); font-family: var(--font);
  background: var(--bg); display: flex; flex-direction: column; min-height: 100%;
}
a { color: var(--accent); text-decoration: none; }
.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.55rem 1rem; background: var(--panel); border-bottom: 1px solid #0b1219;
  flex-shrink: 0; z-index: 5;
}
.brand { color: var(--ink); font-weight: 700; letter-spacing: 0.02em; font-size: 1.1rem; }
.brand span { color: var(--accent); }
nav { display: flex; gap: 0.65rem; align-items: center; flex-wrap: wrap; }
nav a { color: var(--muted); font-size: 0.9rem; }
nav a:hover, nav a.active { color: var(--ink); }
.who { color: var(--muted); font-size: 0.85rem; }
.badge {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 1.1rem; height: 1.1rem; padding: 0 0.3rem;
  background: var(--accent); color: #fff; border-radius: 999px; font-size: 0.7rem; font-weight: 700;
}
.inline { display: inline; margin: 0; }
button, .btn {
  background: var(--accent); color: #fff; border: none; padding: 0.55rem 0.9rem;
  font: inherit; font-weight: 600; cursor: pointer; border-radius: 8px;
}
button:hover, .btn:hover { background: var(--accent-dim); }
.btn.ghost, button.ghost {
  background: transparent; color: var(--ink); border: 1px solid var(--panel2);
}
.app {
  flex: 1; display: grid; grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 0; max-width: 1200px; width: 100%; margin: 0 auto;
}
.sidebar {
  background: var(--panel); border-right: 1px solid #0b1219;
  display: flex; flex-direction: column; min-height: 0; overflow: hidden;
}
.sidebar-head { padding: 0.85rem 1rem; border-bottom: 1px solid #0b1219; }
.sidebar-head h2 { margin: 0; font-size: 1rem; }
.side-nav { list-style: none; margin: 0; padding: 0.4rem 0; overflow: auto; flex: 1; }
.side-nav a {
  display: flex; align-items: center; gap: 0.55rem;
  padding: 0.55rem 1rem; color: var(--ink); font-size: 0.95rem;
}
.side-nav a:hover { background: var(--panel2); }
.side-nav li.active a { background: var(--panel2); }
.side-nav .ico { width: 1.5rem; text-align: center; opacity: 0.7; }
.main { display: flex; flex-direction: column; min-height: 0; background: var(--bg);
  background-image: radial-gradient(ellipse at top, #1a2733 0%, transparent 55%);
}
.layout-pad { padding: 1.25rem; overflow: auto; flex: 1; }
.hero h1 { font-size: 1.75rem; margin: 0 0 0.35rem; }
.lead { color: var(--muted); margin: 0 0 1rem; }
.chat {
  flex: 1; display: flex; flex-direction: column; min-height: 0;
}
.chat-head {
  padding: 0.75rem 1rem; background: var(--panel); border-bottom: 1px solid #0b1219;
}
.chat-head h1 { margin: 0; font-size: 1.05rem; }
.messages {
  flex: 1; overflow: auto; padding: 1rem; display: flex; flex-direction: column; gap: 0.45rem;
}
.bubble {
  max-width: min(75%, 520px); padding: 0.5rem 0.75rem;
  background: var(--panel); border-radius: var(--radius); align-self: flex-start;
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}
.bubble.mine { align-self: flex-end; background: var(--mine); }
.meta { color: var(--accent); font-size: 0.75rem; margin-bottom: 0.15rem; font-weight: 600; }
.bubble img.media {
  display: block; max-width: 100%; max-height: 280px; border-radius: 8px; margin-top: 0.35rem;
}
.composer {
  display: flex; gap: 0.4rem; align-items: center;
  padding: 0.65rem 0.85rem; background: var(--panel); border-top: 1px solid #0b1219;
}
.composer input[type="text"], .composer input[type="search"], .composer textarea, select,
.stack input, .stack textarea {
  flex: 1; background: var(--panel2); border: none; color: var(--ink);
  padding: 0.7rem 0.85rem; font: inherit; border-radius: 10px;
}
.composer input[type="file"] { max-width: 8rem; color: var(--muted); font-size: 0.8rem; }
.muted { color: var(--muted); }
.ok { color: #4fae4e; }
.error { color: #e53935; }
.small { font-size: 0.85rem; }
.panel {
  background: var(--panel); border-radius: var(--radius); padding: 1.25rem;
  max-width: 640px;
}
.box { margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--panel2); }
.row { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
.stack { display: flex; flex-direction: column; gap: 0.55rem; }
.flashes { list-style: none; padding: 0.5rem 1rem; margin: 0; }
.flashes .error { color: #e53935; }
.card-list { list-style: none; padding: 0; margin: 0; }
.card-list li {
  padding: 0.75rem; border-bottom: 1px solid var(--panel2);
  display: flex; justify-content: space-between; gap: 0.75rem; align-items: center;
}
.feed-post {
  background: var(--panel); border-radius: var(--radius); padding: 1rem; margin-bottom: 0.75rem;
}
.feed-post .meta { margin-bottom: 0.4rem; }
.feed-post img { max-width: 100%; border-radius: 8px; margin-top: 0.5rem; }
.search-results li { padding: 0.55rem 0; border-bottom: 1px solid var(--panel2); }
.mobile-toggle {
  display: none; background: transparent; border: none; color: var(--ink);
  font-size: 1.4rem; padding: 0.25rem 0.5rem; cursor: pointer;
}
@media (max-width: 800px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; inset: 0 auto 0 0; width: min(86vw, var(--sidebar-w));
    transform: translateX(-105%); transition: transform 0.2s; z-index: 20;
    box-shadow: 8px 0 24px rgba(0,0,0,0.4);
  }
  .sidebar.open { transform: translateX(0); }
  .mobile-toggle { display: inline-block; }
  .backdrop {
    display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.45); z-index: 15;
  }
  .backdrop.show { display: block; }
}