:root {
  --bg: #0f172a;
  --panel: #111827;
  --card: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #0ea5e9;
  --ok: #22c55e;
  --err: #ef4444;
  --border: #1f2a3d;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

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

.muted { color: var(--muted); }
.ok    { color: var(--ok); font-weight: 600; }
.err   { color: var(--err); font-weight: 600; }

button {
  background: var(--accent);
  color: #0f172a;
  border: 0;
  padding: 0.6rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
}
button:hover { filter: brightness(1.1); }
button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--muted);
}

pre {
  background: #0b1220;
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------- Centered card (used by signed-out + callback) ---------- */
.center {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; padding: 1rem;
}
.card {
  background: var(--card);
  border-radius: 12px;
  padding: 2rem 2.5rem;
  width: 100%;
  max-width: 560px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}

/* ---------- App shell with sidebar ---------- */
.app {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.25rem 0;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0 1.25rem 1rem;
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--border);
}

.nav {
  list-style: none;
  margin: 0; padding: 0.5rem 0;
  flex: 1;
}
.nav li {
  display: block;
}
.nav button {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--text);
  border: 0;
  padding: 0.7rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-left: 3px solid transparent;
  border-radius: 0;
  cursor: pointer;
}
.nav button:hover { background: rgba(255,255,255,0.04); }
.nav button.active {
  background: rgba(56, 189, 248, 0.08);
  color: var(--accent);
  border-left-color: var(--accent);
}

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}
.sidebar-footer .who { display: block; color: var(--text); margin-bottom: 0.5rem; word-break: break-all; }

.content {
  padding: 2rem 2.5rem;
  overflow-y: auto;
}

.view { display: none; }
.view.active { display: block; }

.view h2 {
  margin: 0 0 1rem;
  font-size: 1.4rem;
}

/* ---------- Profile ---------- */
.kv {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0.4rem 1rem;
  background: var(--card);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}
.kv dt { color: var(--muted); }
.kv dd { margin: 0; word-break: break-all; }

/* ---------- Inbox ---------- */
.inbox {
  background: var(--card);
  border-radius: 10px;
  overflow: hidden;
}
.inbox-list { list-style: none; margin: 0; padding: 0; }
.inbox-list li {
  border-bottom: 1px solid var(--border);
}
.inbox-list li:last-child { border-bottom: 0; }
.inbox-list button {
  width: 100%;
  background: transparent;
  border: 0;
  text-align: left;
  padding: 0.9rem 1.25rem;
  color: var(--text);
  cursor: pointer;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.25rem 1rem;
  align-items: baseline;
  border-radius: 0;
}
.inbox-list button:hover { background: rgba(255,255,255,0.03); }
.inbox-list .subj { font-weight: 600; }
.inbox-list .from { color: var(--muted); font-size: 0.85rem; }
.inbox-list .when { color: var(--muted); font-size: 0.8rem; white-space: nowrap; }

.message-detail {
  background: var(--card);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}
.message-detail header { margin-bottom: 1rem; }
.message-detail h3 { margin: 0 0 0.5rem; }

@media (max-width: 720px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
  .content { padding: 1.25rem; }
  .kv { grid-template-columns: 1fr; }
}