:root {
  --bg: #0f1115;
  --bg-soft: #1a1d24;
  --bg-card: #1f232c;
  --fg: #e6e8ee;
  --fg-muted: #8a93a6;
  --accent: #6ea8ff;
  --accent-hover: #8cbcff;
  --danger: #ff6464;
  --border: #2a2f3a;
  --radius: 10px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
body { display: flex; }

/* ===== Sidebar ===== */
.sidebar {
  width: 240px;
  background: var(--bg-soft);
  border-right: 1px solid var(--border);
  padding: 24px 20px;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 10;
}
.brand { font-size: 22px; font-weight: 700; letter-spacing: 0.02em; margin-bottom: 32px; }
.nav { display: flex; flex-direction: column; gap: 4px; }
.nav-link { display: block; padding: 10px 12px; border-radius: 8px; color: var(--fg); background: transparent; border: none; text-align: left; font-size: 14px; cursor: pointer; }
.nav-link:hover { background: #252934; color: var(--fg); }
.logout-form { margin: 0; }
.logout-btn { width: 100%; }
.user-email { margin-top: auto; font-size: 12px; color: var(--fg-muted); word-break: break-all; }

.sidebar-toggle {
  display: none;
  position: fixed;
  top: 12px; left: 12px;
  z-index: 20;
  background: var(--bg-card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 18px;
  cursor: pointer;
}

/* ===== Main ===== */
.main {
  margin-left: 240px;
  padding: 40px 32px;
  flex: 1;
  max-width: 100%;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 780px;
}
.card-narrow { max-width: 420px; margin: 40px auto; }
h1 { margin: 0 0 8px; font-size: 24px; }
h2 { margin: 32px 0 12px; font-size: 18px; }
.muted { color: var(--fg-muted); }

/* ===== Forms ===== */
.form { display: flex; flex-direction: column; gap: 14px; }
.form-compact { margin-top: 10px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--fg-muted); }
.form input[type="text"], .form input[type="email"], .form input[type="password"] {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
}
.form input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.form-row { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

.inline-form { display: inline-block; margin: 0 0 0 6px; }

.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
}
.btn-primary { background: var(--accent); color: #0b1220; border-color: var(--accent); }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); color: #0b1220; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary { background: transparent; color: var(--fg); border-color: var(--border); }
.btn-secondary:hover { background: var(--bg-soft); }
.btn-danger { background: transparent; color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: rgba(255,100,100,0.1); }
.btn-link { background: transparent; color: var(--accent); border: none; padding: 4px 6px; cursor: pointer; font-size: 13px; }
.btn-link:hover { color: var(--accent-hover); }

/* ===== Flash ===== */
.flash { padding: 12px 14px; border-radius: 8px; margin-bottom: 16px; border: 1px solid var(--border); background: var(--bg-soft); font-size: 14px; }
.flash-error { border-color: var(--danger); color: #ffb3b3; background: rgba(255,100,100,0.08); }
.flash-success { border-color: #4caf78; color: #b9f0ce; background: rgba(76,175,120,0.08); }

/* ===== Table ===== */
.table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; font-size: 14px; vertical-align: top; }
.table th { color: var(--fg-muted); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
.badge { background: var(--accent); color: #0b1220; padding: 2px 8px; border-radius: 999px; font-size: 11px; font-weight: 600; }

.cta { margin-top: 32px; padding: 16px; background: var(--bg-soft); border-radius: 8px; border: 1px solid var(--border); }

details > summary { cursor: pointer; list-style: none; }
details > summary::-webkit-details-marker { display: none; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  body { flex-direction: column; }
  .sidebar { position: fixed; transform: translateX(-100%); transition: transform 0.2s ease; width: 80%; max-width: 280px; }
  .sidebar.open { transform: translateX(0); }
  .sidebar-toggle { display: block; }
  .main { margin-left: 0; padding: 64px 16px 32px; }
  .card { padding: 20px; }
  .card-narrow { margin: 20px auto; }
}