:root {
  --bg: #0f0e17;
  --surface: #1a1a2e;
  --surface-2: #222244;
  --text: #e8e8f0;
  --text-sub: #8888aa;
  --border: #2a2a4a;
  --purple: #8B5CF6;
  --pink: #E040FB;
  --green: #10B981;
  --yellow: #F59E0B;
  --red: #EF4444;
  --blue: #3B82F6;
  --gradient: linear-gradient(135deg, #8B5CF6, #E040FB);
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 0 24px 40px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.header-left h1 {
  font-size: 24px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-sub { color: var(--text-sub); font-size: 14px; }

.header-right { display: flex; gap: 12px; align-items: center; }

.header-right select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
}

.btn-refresh {
  background: var(--gradient);
  color: #fff;
  border: none;
  padding: 8px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
}

.btn-refresh:hover { filter: brightness(1.1); }

/* Alerts */
.alerts { margin-bottom: 16px; }
.alert {
  padding: 12px 20px;
  border-radius: var(--radius);
  margin-bottom: 8px;
  font-weight: 500;
  font-size: 14px;
}
.alert.warning { background: rgba(245,158,11,0.15); color: var(--yellow); border: 1px solid rgba(245,158,11,0.3); }
.alert.danger { background: rgba(239,68,68,0.15); color: var(--red); border: 1px solid rgba(239,68,68,0.3); }

/* Sections */
.section { margin-bottom: 32px; }
.section h2 {
  font-size: 18px;
  color: var(--text-sub);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

/* Balance Cards */
.balance-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.balance-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
  overflow: hidden;
}

.balance-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.balance-card.anthropic::before { background: linear-gradient(90deg, #D97706, #F59E0B); }
.balance-card.serper::before { background: linear-gradient(90deg, #3B82F6, #60A5FA); }
.balance-card.fal::before { background: linear-gradient(90deg, #8B5CF6, #A78BFA); }

.balance-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 20px;
  flex-shrink: 0;
}

.anthropic .balance-icon { background: rgba(217,119,6,0.2); color: var(--yellow); }
.serper .balance-icon { background: rgba(59,130,246,0.2); color: var(--blue); }
.fal .balance-icon { background: rgba(139,92,246,0.2); color: var(--purple); }

.balance-info { flex: 1; }
.balance-name { font-size: 14px; color: var(--text-sub); margin-bottom: 4px; }
.balance-value { font-size: 28px; font-weight: 700; }
.balance-detail { font-size: 12px; color: var(--text-sub); margin-top: 2px; }

.balance-status {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  position: absolute;
  top: 16px;
  right: 16px;
}
.balance-status.green { background: var(--green); box-shadow: 0 0 8px var(--green); }
.balance-status.yellow { background: var(--yellow); box-shadow: 0 0 8px var(--yellow); }
.balance-status.red { background: var(--red); box-shadow: 0 0 8px var(--red); }

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--purple);
}

.stat-label {
  font-size: 12px;
  color: var(--text-sub);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Charts */
.charts-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
}

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.chart-card h3 {
  font-size: 15px;
  color: var(--text-sub);
  margin-bottom: 16px;
}

/* Edit Balance Button */
.btn-edit-balance {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-edit-balance:hover { color: var(--text); border-color: var(--purple); }

.balance-remaining {
  font-size: 12px;
  margin-top: 4px;
}
.balance-remaining.ok { color: var(--green); }
.balance-remaining.low { color: var(--yellow); }
.balance-remaining.critical { color: var(--red); }

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 100;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  width: 380px;
  max-width: 90vw;
}

.modal h3 {
  font-size: 16px;
  margin-bottom: 20px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.modal label {
  display: block;
  font-size: 12px;
  color: var(--text-sub);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.modal input, .modal textarea {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 16px;
  outline: none;
}
.modal input:focus, .modal textarea:focus { border-color: var(--purple); }

.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 4px; }

.btn-save {
  background: var(--gradient);
  color: #fff;
  border: none;
  padding: 8px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
}
.btn-cancel {
  background: transparent;
  color: var(--text-sub);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
}
.btn-cancel:hover { color: var(--text); }

/* Footer */
footer {
  text-align: center;
  color: var(--text-sub);
  font-size: 13px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 768px) {
  .balance-grid { grid-template-columns: 1fr; }
  .charts-grid { grid-template-columns: 1fr; }
  header { flex-direction: column; gap: 12px; }
}