:root {
  --bg: #0f172a;
  --bg-soft: #111827;
  --surface: #1e293b;
  --surface-2: #273449;
  --border: #334155;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --primary: #22c55e;
  --primary-dark: #16a34a;
  --danger: #f87171;
  --danger-bg: rgba(248,113,113,0.12);
  --income-bg: rgba(34,197,94,0.12);
  --expense-bg: rgba(248,113,113,0.12);
  --radius: 14px;
  --shadow: 0 4px 16px rgba(0,0,0,0.25);
  font-size: 16px;
}

* { box-sizing: border-box; }

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

a { color: inherit; text-decoration: none; }
.hidden { display: none !important; }

/* Topbar */
.topbar {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { font-weight: 700; font-size: 1.1rem; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.user-name { color: var(--text-dim); font-size: 0.9rem; }
.finanza-select {
  width: auto;
  max-width: 160px;
  padding: 7px 10px;
  font-size: 0.85rem;
  background: var(--surface-2);
}
@media (max-width: 480px) {
  .finanza-select { max-width: 110px; font-size: 0.78rem; }
  .user-name { display: none; }
}

/* Layout */
.layout {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
}
.app-content {
  flex: 1;
  min-width: 0;
  padding: 16px;
  padding-bottom: 90px; /* espacio para bottomnav en movil */
}

/* Sidenav (escritorio) */
.sidenav {
  width: 220px;
  flex-shrink: 0;
  padding: 24px 12px;
  position: sticky;
  top: 57px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.nav-item:hover { background: var(--surface); color: var(--text); }
.nav-item.active { background: var(--surface-2); color: var(--text); font-weight: 600; }

/* Bottomnav (movil) */
.bottomnav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 30;
  padding-bottom: env(safe-area-inset-bottom);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox */
}
.bottomnav::-webkit-scrollbar { display: none; } /* Chrome/Safari */
.bn-item {
  flex: 0 0 auto;
  scroll-snap-align: start;
  width: 76px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 0 10px;
  font-size: 1.1rem;
  color: var(--text-dim);
}
.bottomnav { scroll-snap-type: x proximity; }
.bn-item span { font-size: 0.68rem; white-space: nowrap; }
.bn-item.active { color: var(--primary); }

@media (min-width: 768px) {
  .bottomnav { display: none !important; }
  .sidenav { display: flex !important; }
}
@media (max-width: 767px) {
  .sidenav { display: none !important; }
}
/* La clase .hidden (controlada por JS segun sesion) siempre debe ganar a las reglas de arriba,
   independientemente del ancho de pantalla; por eso usamos un selector mas especifico. */
nav.hidden, header.hidden { display: none !important; }

/* Genericos */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
h1 { font-size: 1.4rem; margin: 0 0 16px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }
p { color: var(--text-dim); line-height: 1.5; }

.btn {
  background: var(--primary);
  color: #05230f;
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
}
.btn:hover { background: var(--primary-dark); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-block { width: 100%; }
.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.85rem;
}
.btn-ghost:hover { color: var(--text); border-color: var(--text-dim); }
.btn-danger { background: var(--danger); color: #2a0a0a; }

.field { margin-bottom: 14px; display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 0.85rem; color: var(--text-dim); }
input, select, textarea {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 11px 12px;
  font-size: 0.95rem;
  font-family: inherit;
  width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; }

.error-msg { color: var(--danger); font-size: 0.85rem; margin-top: 6px; min-height: 1em; }

/* Auth */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.auth-card { width: 100%; max-width: 380px; }
.auth-title { text-align: center; font-size: 1.6rem; margin-bottom: 4px; }
.auth-sub { text-align: center; margin-bottom: 24px; }
.auth-switch { text-align: center; margin-top: 14px; font-size: 0.9rem; }
.auth-switch a { color: var(--primary); font-weight: 600; }

/* Chat */
.chat-wrap { display: flex; flex-direction: column; height: calc(100vh - 170px); }
.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 4px 2px 12px;
}
.msg {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: 16px;
  line-height: 1.4;
  font-size: 0.95rem;
  white-space: pre-wrap;
}
.msg.user { align-self: flex-end; background: var(--primary); color: #05230f; border-bottom-right-radius: 4px; }
.msg.assistant { align-self: flex-start; background: var(--surface); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg.system-note { align-self: center; color: var(--text-dim); font-size: 0.8rem; }
.chat-tx-card {
  align-self: flex-start;
  max-width: 82%;
  background: var(--income-bg);
  border: 1px solid var(--primary);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 0.85rem;
}
.chat-tx-card.expense { background: var(--expense-bg); border-color: var(--danger); }
.chat-input-row { display: flex; gap: 8px; padding-top: 8px; border-top: 1px solid var(--border); }
.chat-input-row input { flex: 1; }
.typing { color: var(--text-dim); font-size: 0.85rem; align-self: flex-start; }

/* KPIs / dashboard */
.kpi-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-bottom: 16px; }
@media (min-width: 640px) { .kpi-grid { grid-template-columns: repeat(4, 1fr); } }
.kpi { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.kpi-label { color: var(--text-dim); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; }
.kpi-value { font-size: 1.35rem; font-weight: 700; margin-top: 4px; }
.kpi-delta { font-size: 0.78rem; margin-top: 4px; }
.kpi-delta.up { color: var(--primary); }
.kpi-delta.down { color: var(--danger); }
.kpi-value.income { color: var(--primary); }
.kpi-value.expense { color: var(--danger); }

.month-selector { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.month-selector select { width: auto; }

.chart-card canvas { max-height: 280px; }

/* Tabla movimientos */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--text-dim); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; }
.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge.income { background: var(--income-bg); color: var(--primary); }
.badge.expense { background: var(--expense-bg); color: var(--danger); }
.row-actions button { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 0.9rem; padding: 4px 6px; }
.row-actions button:hover { color: var(--text); }

/* Filtros */
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.filters select, .filters input { width: auto; min-width: 140px; }

/* Categorias */
.cat-grid { display: grid; grid-template-columns: 1fr; gap: 10px; }
@media (min-width: 640px) { .cat-grid { grid-template-columns: 1fr 1fr; } }
.cat-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.cat-list li { display: flex; justify-content: space-between; align-items: center; background: var(--surface-2); padding: 9px 12px; border-radius: 10px; font-size: 0.9rem; }
.cat-list .default-tag { color: var(--text-dim); font-size: 0.72rem; }

.form-inline { display: flex; gap: 8px; margin-top: 10px; }
.form-inline input, .form-inline select { flex: 1; }

.loading-center { display: flex; justify-content: center; padding: 40px 0; color: var(--text-dim); }
.empty-state { text-align: center; padding: 30px 10px; color: var(--text-dim); }