:root {
  --bg: #0f1419;
  --panel: #1a2029;
  --panel-2: #232b36;
  --border: #2d3744;
  --text: #e6edf3;
  --muted: #8b97a7;
  --accent: #25d366;      /* WhatsApp green */
  --accent-dark: #1da851;
  --danger: #f0506e;
  --danger-dark: #c93b56;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

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

/* Top bar */
.topbar {
  display: flex; align-items: center; gap: 24px;
  padding: 0 24px; height: 60px;
  background: var(--panel); border-bottom: 1px solid var(--border);
}
.topbar .brand a { color: var(--text); font-weight: 700; font-size: 18px; }
.topbar nav { display: flex; gap: 6px; flex: 1; }
.topbar nav a { color: var(--muted); padding: 8px 14px; border-radius: 8px; }
.topbar nav a:hover { background: var(--panel-2); text-decoration: none; color: var(--text); }
.topbar nav a.active { color: var(--text); background: var(--panel-2); }
.account { display: flex; align-items: center; gap: 12px; }
.account .who { color: var(--muted); font-size: 14px; }
.account form { margin: 0; }

main { max-width: 1080px; margin: 0 auto; padding: 28px 24px 60px; }
main.centered { display: flex; min-height: 90vh; align-items: center; justify-content: center; }

h1 { font-size: 24px; margin: 0 0 6px; }
h2 { font-size: 18px; margin: 28px 0 12px; }
.subtitle { color: var(--muted); margin: 0 0 24px; }

/* Flash messages */
.flashes { margin-bottom: 18px; display: flex; flex-direction: column; gap: 8px; }
.flash { padding: 12px 16px; border-radius: 8px; border: 1px solid var(--border); }
.flash-success { background: rgba(37,211,102,.12); border-color: var(--accent-dark); }
.flash-error { background: rgba(240,80,110,.12); border-color: var(--danger-dark); }

/* Buttons */
.btn {
  display: inline-block; cursor: pointer; font-size: 14px; font-weight: 600;
  padding: 9px 16px; border-radius: 8px; border: 1px solid transparent;
  background: var(--accent); color: #08130c;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; }
.btn-secondary { background: var(--panel-2); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-dark); }
.btn-ghost { background: transparent; color: var(--muted); border-color: var(--border); padding: 7px 12px; }
.btn-ghost:hover { color: var(--text); background: var(--panel-2); }
.btn-sm { padding: 5px 10px; font-size: 13px; }

/* Cards / panels */
.panel {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin-bottom: 20px;
}
.row-between { display: flex; align-items: center; justify-content: space-between; gap: 16px; }

/* Tables */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: none; }
td.num { font-variant-numeric: tabular-nums; }

.badge { display: inline-block; font-size: 12px; padding: 3px 9px; border-radius: 999px; font-weight: 600; }
.badge-on { background: rgba(37,211,102,.15); color: var(--accent); }
.badge-off { background: rgba(139,151,167,.15); color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }

/* Forms */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 13px; font-weight: 600; color: var(--text); }
.field .hint { font-size: 12px; color: var(--muted); }
input[type=text], input[type=password], input[type=email], input[type=number], select, textarea {
  width: 100%; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  font-size: 14px; font-family: inherit;
}
textarea { resize: vertical; }
textarea.code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); }
.checkbox { flex-direction: row; align-items: center; gap: 8px; }
.checkbox input { width: auto; }

fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; margin: 0 0 20px; }
legend { padding: 0 8px; color: var(--muted); font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }

.actions { display: flex; gap: 10px; margin-top: 8px; }
.errors { margin-bottom: 16px; }

/* Login */
.login-card { width: 360px; max-width: 90vw; }
.login-card h1 { text-align: center; }
.login-logo { text-align: center; font-size: 40px; margin-bottom: 8px; }

/* Chat transcript */
.chat { display: flex; flex-direction: column; gap: 10px; }
.bubble { max-width: 70%; padding: 10px 14px; border-radius: 14px; font-size: 14px; white-space: pre-wrap; }
.bubble.user { align-self: flex-start; background: var(--panel-2); border: 1px solid var(--border); }
.bubble.assistant { align-self: flex-end; background: var(--accent-dark); color: #f3fff8; }
.bubble.system { align-self: center; background: transparent; color: var(--muted); font-size: 12px; }
.bubble .meta { display: block; font-size: 11px; color: var(--muted); margin-top: 4px; }

.empty { color: var(--muted); padding: 20px; text-align: center; }
.inline-form { display: inline; margin: 0; }
.muted { color: var(--muted); }
.tag { font-size: 12px; color: var(--muted); }