:root {
  --bg: #0f1419;
  --card: #1a2332;
  --text: #e7ecf3;
  --muted: #8b9cb3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #2d3a4f;
  --ok: #22c55e;
  --err: #ef4444;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a { color: var(--accent); }
.muted { color: var(--muted); font-size: 0.9rem; }

.landing .hero {
  text-align: center;
  padding: 3rem 1.5rem;
  background: linear-gradient(180deg, #1a2744 0%, var(--bg) 100%);
}
.landing h1 { font-size: 2rem; margin: 0 0 0.5rem; }
.landing .subtitle { color: var(--muted); max-width: 32rem; margin: 0 auto 1.5rem; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  padding: 2rem 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}
.features article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.login-block {
  max-width: 420px;
  margin: 0 auto 3rem;
  text-align: center;
  padding: 0 1rem;
}

.login-block .btn.primary {
  margin: 1rem 0;
}

.oauth-fallback {
  margin-top: 1.5rem;
  text-align: left;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
}

.oauth-fallback summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.9rem;
}

.oauth-fallback #telegram-login {
  margin-top: 1rem;
  text-align: center;
}

footer { text-align: center; padding: 2rem; color: var(--muted); font-size: 0.85rem; }

.btn {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--card);
  cursor: pointer;
  font-size: 1rem;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-hover); }
.btn.small { padding: 0.4rem 0.75rem; font-size: 0.85rem; }
.btn.danger { border-color: var(--err); color: var(--err); }

/* App */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  position: sticky;
  top: 0;
  z-index: 10;
}
.app-header h1 { font-size: 1.1rem; margin: 0; }

.tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  overflow-x: auto;
  border-bottom: 1px solid var(--border);
}
.tabs button {
  flex: 1;
  min-width: 4rem;
  padding: 0.5rem;
  border: none;
  background: transparent;
  color: var(--muted);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.8rem;
}
.tabs button.active { background: var(--accent); color: #fff; }

.panel { padding: 1rem 1.25rem; max-width: 520px; margin: 0 auto; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.card h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.status-ok { color: var(--ok); }
.status-off { color: var(--err); }

.tariff-list { display: flex; flex-direction: column; gap: 0.5rem; }
.tariff-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.device-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}
.device-row:last-child { border: none; }

input[type="text"] {
  width: 100%;
  padding: 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  margin-bottom: 0.5rem;
}

.help-html b { display: block; margin-top: 1rem; }

.hidden { display: none !important; }

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 1rem;
  padding-bottom: max(1rem, env(safe-area-inset-bottom));
}

.modal-box {
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px 16px 0 0;
  padding: 1rem;
}

.modal-box h3 { margin: 0 0 0.75rem; font-size: 1.1rem; }

#config-modal-text {
  width: 100%;
  min-height: 140px;
  max-height: 35vh;
  font-family: ui-monospace, monospace;
  font-size: 0.7rem;
  line-height: 1.35;
  padding: 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  margin-bottom: 0.75rem;
}

.config-qr {
  text-align: center;
  margin-bottom: 0.75rem;
}

.config-qr img {
  max-width: 220px;
  width: 100%;
  border-radius: 8px;
  background: #fff;
  padding: 8px;
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.modal-actions .btn { flex: 1 1 auto; min-width: 5rem; }