:root {
  --bg: #161821;
  --bg-panel: #1e202c;
  --bg-card: #232634;
  --border: #2e3142;
  --text: #e4e6f0;
  --text-muted: #8a8da3;
  --accent: #5b8cff;
  --accent-hover: #4779f0;
  --positive: #4fd17a;
  --negative: #ff6b6b;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

a { color: var(--accent); }
.hidden { display: none !important; }

/* Pantalla de inicio */
.start-screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  padding: 24px 16px;
}
.start-buttons { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; justify-content: center; }

.muted { color: var(--text-muted); }

button, .btn-primary, .btn-secondary {
  cursor: pointer;
  border: none;
  border-radius: 6px;
  padding: 10px 16px;
  font-size: 14px;
  font-family: inherit;
  min-height: 40px;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg-card); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-link { background: none; color: var(--accent); padding: 6px 8px; text-decoration: underline; font-size: 13px; border: none; cursor: pointer; font-family: inherit; min-height: auto; }

input, select {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 10px;
  font-size: 16px; /* 16px+ evita el zoom automático de iOS al enfocar un input */
  font-family: inherit;
  min-height: 40px;
}

/* Botón hamburguesa (solo visible en móvil) */
.menu-toggle {
  display: none;
  position: fixed;
  top: calc(10px + var(--safe-top));
  left: 10px;
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 20px;
}

/* App shell */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 200px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px 0;
  padding-top: calc(16px + var(--safe-top));
  padding-bottom: calc(16px + var(--safe-bottom));
  position: sticky;
  top: 0;
  height: 100vh;
}
.sidebar-title { font-weight: 700; font-size: 16px; padding: 0 20px 16px; }
.nav-section { padding: 16px 20px 4px; font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); opacity: 0.6; }
.nav-item { display: block; padding: 12px 20px; cursor: pointer; color: var(--text-muted); text-decoration: none; }
.nav-item:hover { background: var(--bg-card); color: var(--text); }
.nav-item.active { background: var(--bg-card); color: var(--accent); border-left: 3px solid var(--accent); }
.sidebar-spacer { flex: 1; }
.save-indicator { padding: 0 20px; color: var(--positive); font-size: 12px; height: 16px; display: block; }
.btn-save { margin: 8px 20px 0; }

.main-content {
  flex: 1;
  min-width: 0;
  padding: 24px 32px;
  padding-top: calc(24px + var(--safe-top));
  overflow-y: auto;
  overflow-x: hidden;
}

h1 { margin-top: 0; font-size: 22px; }
h2 { font-size: 15px; color: var(--text-muted); margin-bottom: 10px; }

/* Cards */
.cards-row { display: flex; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; min-width: 140px; flex: 1 1 140px; }
.card-label { color: var(--text-muted); font-size: 12px; margin-bottom: 6px; }
.card-value { font-size: 20px; font-weight: 600; }
.positive { color: var(--positive); }
.negative { color: var(--negative); }

.panels-row { display: flex; gap: 16px; flex-wrap: wrap; }
.panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; flex: 1; min-width: 320px; margin-bottom: 16px; }

table { width: 100%; border-collapse: collapse; font-size: 13px; }
table td, table th { padding: 8px; border-bottom: 1px solid var(--border); text-align: left; }
table th { color: var(--text-muted); font-weight: 500; }

/* Formularios */
.form-row { display: flex; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; align-items: center; }
.form-grid { display: grid; grid-template-columns: 140px 1fr; gap: 10px 14px; align-items: center; max-width: 500px; margin-bottom: 16px; }
.form-grid label { color: var(--text-muted); }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.tab-btn { background: var(--bg-card); color: var(--text-muted); border: 1px solid var(--border); text-decoration: none; display: inline-block; padding: 10px 14px; }
.tab-btn.active { color: var(--accent); border-color: var(--accent); }

.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; }
.alert-success { background: rgba(79,209,122,0.15); color: var(--positive); }
.alert-error { background: rgba(255,107,107,0.15); color: var(--negative); }

/* ---------- Móvil ---------- */
@media (max-width: 820px) {
  .menu-toggle { display: block; }

  .app-shell { position: relative; }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 240px;
    max-width: 80vw;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 90;
    box-shadow: 2px 0 16px rgba(0,0,0,0.4);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-title { padding-top: 44px; }

  .main-content {
    padding: 16px;
    padding-top: calc(64px + var(--safe-top));
    width: 100%;
  }

  .cards-row { gap: 10px; }
  .card { min-width: 0; flex: 1 1 45%; padding: 12px 14px; }
  .card-value { font-size: 17px; }

  .panel { min-width: 0; padding: 14px; }

  .form-grid { grid-template-columns: 1fr; max-width: 100%; }
  .form-grid label { margin-top: 6px; }
  .form-row { flex-direction: column; align-items: stretch; }
  .form-row > * { width: 100%; }
  .form-row > label { width: auto; }

  input, select, button, .btn-primary, .btn-secondary { width: 100%; }
  .btn-link { width: auto; display: inline-block; }
  .form-row .btn-link, .form-row form { width: auto; }

  /* Tablas: scroll horizontal en vez de romper el layout */
  table { display: block; overflow-x: auto; white-space: nowrap; -webkit-overflow-scrolling: touch; }
  table thead, table tbody, table tr { display: table; width: 100%; table-layout: auto; }

  .tabs { gap: 6px; }
  .tab-btn { flex: 1 1 auto; text-align: center; padding: 10px 8px; font-size: 13px; }
}

@media (max-width: 420px) {
  .card { flex: 1 1 100%; }
}