:root {
  --bg-primary: #0b1014;
  --bg-secondary: #111b21;
  --bg-tertiary: #1f2c33;
  --bg-card: #1a262e;
  --bg-input: #2a3942;
  --text-primary: #e9edef;
  --text-secondary: #8696a0;
  --text-muted: #667781;
  --green: #00a884;
  --green-dark: #008f72;
  --green-light: #25d366;
  --red: #ea4335;
  --yellow: #f59e0b;
  --blue: #53bdeb;
  --border: #233138;
  --shadow: 0 1px 3px rgba(0,0,0,.3);
  --radius: 8px;
  --radius-lg: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

#app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
#sidebar {
  width: 240px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px 0;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px 20px;
  color: var(--green);
  font-size: 18px;
  font-weight: 600;
}

.logo svg { color: var(--green); }

.nav-link {
  display: block;
  padding: 10px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: all .15s;
  border-left: 3px solid transparent;
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.nav-link.active { color: var(--green); border-left-color: var(--green); background: rgba(0,168,132,.08); }

.nav-spacer { flex: 1; }

#ws-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 12px;
  color: var(--text-muted);
}
.ws-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--red);
}
.ws-connected .ws-dot { background: var(--green); }
.ws-connected .ws-text { color: var(--green); }

/* Main content */
#content {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
  max-height: 100vh;
}

h1 { font-size: 24px; font-weight: 600; margin-bottom: 24px; }
h2 { font-size: 18px; font-weight: 600; margin-bottom: 16px; }

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 12px;
  transition: border-color .15s;
}
.card:hover { border-color: var(--green-dark); }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.card-title { font-weight: 600; font-size: 15px; }

/* Status badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}
.badge-connected { background: rgba(0,168,132,.15); color: var(--green); }
.badge-disconnected { background: rgba(134,150,160,.15); color: var(--text-secondary); }
.badge-connecting { background: rgba(245,158,11,.15); color: var(--yellow); }
.badge-logged_out { background: rgba(234,67,53,.15); color: var(--red); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
}
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-dark); }
.btn-secondary { background: var(--bg-input); color: var(--text-primary); }
.btn-secondary:hover { background: var(--bg-tertiary); }
.btn-danger { background: rgba(234,67,53,.15); color: var(--red); }
.btn-danger:hover { background: rgba(234,67,53,.25); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; }
.form-input, .form-select {
  width: 100%;
  padding: 9px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color .15s;
}
.form-input:focus, .form-select:focus { border-color: var(--green); }
textarea.form-input { resize: vertical; min-height: 60px; font-family: inherit; }

/* Session cards grid */
.sessions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.session-card {
  cursor: pointer;
}
.session-card .session-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 8px;
}
.session-card .session-phone { font-family: 'SF Mono', monospace; }

/* QR display */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}
.qr-code {
  background: #fff;
  padding: 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}
.qr-code canvas { display: block; }
.qr-instructions { color: var(--text-secondary); font-size: 13px; text-align: center; }

/* Message log */
.msg-list {
  max-height: 400px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-primary);
}
.msg-item {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.msg-item:last-child { border-bottom: none; }
.msg-from { color: var(--green); font-weight: 600; margin-right: 8px; }
.msg-text { color: var(--text-primary); }
.msg-time { color: var(--text-muted); font-size: 11px; float: right; }
.msg-empty { padding: 32px; text-align: center; color: var(--text-muted); }

/* Two-column layout for detail */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.detail-grid .full-width { grid-column: 1 / -1; }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 90%;
  max-width: 480px;
}
.modal h2 { margin-bottom: 20px; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 20px; }

/* Send mode tabs */
.send-mode-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  background: var(--bg);
  border-radius: var(--radius);
  padding: 3px;
}
.send-mode-tab {
  flex: 1;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border-radius: calc(var(--radius) - 2px);
  transition: all .15s;
}
.send-mode-tab.active {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,.12);
}

/* Send result */
.send-result {
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-top: 12px;
  font-size: 13px;
  display: none;
}
.send-result.show { display: block; }
.send-result.success { background: rgba(0,168,132,.12); color: var(--green); }
.send-result.error { background: rgba(234,67,53,.12); color: var(--red); }
.send-result.queued { background: rgba(245,158,11,.12); color: var(--yellow); }

/* Config form */
.config-section { margin-bottom: 24px; }

/* Stats bar */
.stats-bar {
  display: flex;
  gap: 24px;
  margin-bottom: 16px;
}
.stat-item {
  text-align: center;
}
.stat-value { font-size: 24px; font-weight: 700; color: var(--green); }
.stat-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; }

/* Loading spinner */
.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin .6s linear infinite;
  margin: 32px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Toast notifications */
#toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  animation: slideIn .2s ease;
  max-width: 360px;
}
.toast-error { border-color: var(--red); color: var(--red); }
.toast-success { border-color: var(--green); color: var(--green); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 64px 32px;
  color: var(--text-muted);
}
.empty-state h2 { color: var(--text-secondary); margin-bottom: 8px; }

/* Responsive */
@media (max-width: 768px) {
  #sidebar { width: 56px; padding: 8px 0; }
  .logo span, .nav-link, .ws-text { display: none; }
  .nav-link { padding: 12px; text-align: center; border-left: none; border-bottom: 3px solid transparent; }
  .nav-link.active { border-bottom-color: var(--green); border-left-color: transparent; }
  #content { padding: 16px; }
  .detail-grid { grid-template-columns: 1fr; }
  .sessions-grid { grid-template-columns: 1fr; }
}