:root {
  --bg: #0f0f13;
  --bg-card: #1a1a24;
  --bg-card-hover: #22222f;
  --text: #f4f4f5;
  --text-muted: #a1a1aa;
  --primary: #8b5cf6;       /* violeta */
  --primary-hover: #7c3aed;
  --accent: #f97316;        /* coral/naranja */
  --accent-hover: #ea580c;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: #2e2e3a;
  --radius: 14px;
  --shadow: 0 4px 20px rgba(0,0,0,0.35);
}

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

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

/* ========== LOGIN & PIN ========== */
#login-screen,
#role-screen,
#pin-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: radial-gradient(ellipse at top, #1e1b4b 0%, #0f0f13 60%);
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow);
}

.login-card h1 {
  font-size: 1.8rem;
  margin-bottom: 6px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-card .subtitle {
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #6d28d9);
  color: white;
  width: 100%;
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #c2410c);
  color: white;
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--bg-card-hover);
  color: var(--text);
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-sm {
  padding: 7px 12px;
  font-size: 0.85rem;
}

.error-msg {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  display: none;
}

/* ========== APP LAYOUT ========== */
#app {
  display: none;
  min-height: 100vh;
  padding-bottom: 80px;
}

.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-logo {
  font-weight: 700;
  font-size: 1.25rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.user-badge {
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ========== NAVIGATION ========== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-around;
  padding: 8px 0 calc(8px + env(safe-area-inset-bottom));
  z-index: 100;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.7rem;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 10px;
  transition: color 0.2s;
}

.nav-item.active {
  color: var(--primary);
}

.nav-item svg {
  width: 22px;
  height: 22px;
}

/* ========== PAGES ========== */
.page {
  display: none;
  padding: 20px 16px;
  max-width: 900px;
  margin: 0 auto;
}

.page.active {
  display: block;
}

.page-title {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

/* ========== CARDS & LISTS ========== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  transition: background 0.2s;
}

.card:hover {
  background: var(--bg-card-hover);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.card-title {
  font-weight: 600;
  font-size: 1.05rem;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.amount {
  font-weight: 700;
  font-size: 1.15rem;
}

.amount.pending { color: var(--accent); }
.amount.paid { color: var(--success); }
.amount.overdue { color: var(--danger); }

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.badge-pending {
  background: rgba(249, 115, 22, 0.2);
  color: #fdba74;
}

.badge-partial {
  background: rgba(245, 158, 11, 0.2);
  color: #fcd34d;
}

.badge-paid {
  background: rgba(34, 197, 94, 0.2);
  color: #86efac;
}

.badge-overdue {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

/* ========== DASHBOARD ========== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.section-title {
  font-size: 1.1rem;
  margin: 24px 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--primary);
  border-radius: 2px;
}

/* ========== EMPTY STATE ========== */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  opacity: 0.5;
}

/* ========== MODAL ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: none;
  align-items: flex-end;
  justify-content: center;
  z-index: 200;
  padding: 16px;
}

.modal-overlay.open {
  display: flex;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px 20px 12px 12px;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px 20px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-header h3 {
  font-size: 1.2rem;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}

.modal-actions .btn {
  flex: 1;
}

/* ========== FAB ========== */
.fab {
  position: fixed;
  bottom: 90px;
  right: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  border: none;
  font-size: 1.8rem;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
  cursor: pointer;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s;
}

.fab:hover {
  transform: scale(1.08);
}

/* ========== FILTERS ========== */
.filters {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.filter-btn {
  padding: 7px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ========== CALENDAR SIMPLE ========== */
.calendar-list .card {
  display: flex;
  gap: 14px;
  align-items: center;
}

.cal-date {
  min-width: 52px;
  text-align: center;
  background: var(--bg);
  border-radius: 10px;
  padding: 8px 4px;
}

.cal-date .day {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1;
}

.cal-date .month {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* ========== UTILITIES ========== */
.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mb-2 { margin-bottom: 8px; }
.text-muted { color: var(--text-muted); }
.text-sm { font-size: 0.85rem; }
.hidden { display: none !important; }

/* Loading spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Responsive */
@media (min-width: 640px) {
  .page {
    padding: 28px 24px;
  }
  
  .modal-overlay {
    align-items: center;
  }
  
  .modal {
    border-radius: 16px;
  }
}