:root {
  color-scheme: light dark;
  --bg: #0f1420;
  --panel: #1a2233;
  --border: #2c3750;
  --text: #e6ebf5;
  --muted: #8b96ac;
  --accent: #4f7cff;
  --danger: #e5484d;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --border: #dde3ee;
    --text: #16202f;
    --muted: #5b6576;
    --accent: #2f5fe0;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.hidden { display: none !important; }
.view { min-height: 100vh; }

.login-card {
  max-width: 340px;
  margin: 12vh auto;
  padding: 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.login-card h1 { font-size: 18px; margin: 0 0 8px; }

input, select, button {
  font: inherit;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
button {
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
}
button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
button:disabled { opacity: 0.5; cursor: default; }

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}
header h1 { font-size: 16px; margin: 0; }
.header-right { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; }

nav {
  display: flex;
  gap: 4px;
  padding: 12px 24px 0;
  border-bottom: 1px solid var(--border);
}
.tab-btn {
  background: transparent;
  color: var(--muted);
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 8px 14px;
}
.tab-btn.active { color: var(--text); border-bottom-color: var(--accent); }

.tab-panel { padding: 20px 24px; max-width: 900px; }
.tab-panel h2 { font-size: 15px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }

.inline-form { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }

table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }

.status { color: var(--muted); font-size: 13px; min-height: 1.2em; }
.status.error { color: var(--danger); }

#supportSessionResult {
  margin-top: 12px;
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: Consolas, monospace;
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-all;
}