:root {
  --bg: #f4f6fb;
  --card-bg: #ffffff;
  --text: #1f2430;
  --text-muted: #6b7280;
  --primary: #6c5ce7;
  --primary-dark: #5a4fd1;
  --accent: #00b894;
  --border: #e5e7eb;
  --danger: #e74c3c;
  --radius: 14px;
  --shadow: 0 4px 20px rgba(31, 36, 48, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #6c5ce7 0%, #00b894 100%);
  padding: 20px;
}
.login-card {
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  padding: 40px 32px;
  width: 100%;
  max-width: 360px;
  text-align: center;
}
.login-emoji { font-size: 42px; margin-bottom: 8px; }
.login-card h1 { margin: 0 0 4px; font-size: 22px; }
.login-sub { color: var(--text-muted); margin: 0 0 20px; font-size: 14px; }
.login-error {
  background: #fdecea; color: var(--danger);
  border-radius: 8px; padding: 10px; margin-bottom: 14px; font-size: 14px;
}
.login-form input {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--border); font-size: 15px; margin-bottom: 14px;
}
.login-form button[type="submit"] {
  width: 100%; padding: 12px; border: none; border-radius: 10px;
  background: var(--primary); color: #fff; font-size: 15px; font-weight: 600; cursor: pointer;
}
.login-form button[type="submit"]:hover { background: var(--primary-dark); }

.user-switch { display: flex; gap: 10px; }
.user-btn {
  flex: 1; padding: 16px 10px; border-radius: 12px; border: 1px solid var(--border);
  background: #fff; font-size: 15px; font-weight: 600; cursor: pointer; color: var(--text);
}
.user-btn:hover { border-color: var(--primary); color: var(--primary); }
.login-as { font-size: 13px; color: var(--text-muted); margin: 0 0 12px; text-align: center; }
.login-back {
  width: 100%; margin-top: 8px; background: none; border: none; color: var(--text-muted);
  font-size: 13px; cursor: pointer; padding: 6px;
}
.login-back:hover { color: var(--primary); }

.topbar {
  background: linear-gradient(135deg, #6c5ce7 0%, #00b894 100%);
  color: #fff;
}
.topbar-inner {
  max-width: 960px; margin: 0 auto; padding: 18px 20px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { font-size: 18px; font-weight: 700; }
.topbar-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.hi-user { font-size: 13px; opacity: 0.9; }
.btn-ghost-topbar {
  background: rgba(255,255,255,0.18); border: none; color: #fff; border-radius: 20px;
  padding: 7px 12px; font-size: 12px; cursor: pointer;
}
.btn-ghost-topbar:hover { background: rgba(255,255,255,0.3); }
.logout-link {
  color: #fff; text-decoration: none; font-size: 14px;
  background: rgba(255,255,255,0.18); padding: 8px 14px; border-radius: 20px;
}
.logout-link:hover { background: rgba(255,255,255,0.3); }

.tabs {
  max-width: 960px; margin: 0 auto; padding: 0 20px 14px; display: flex; gap: 8px;
}
.tab-btn {
  background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.3); color: #fff;
  border-radius: 20px; padding: 7px 16px; font-size: 13px; font-weight: 600; cursor: pointer;
}
.tab-btn.active { background: #fff; color: var(--primary); border-color: #fff; }
.tab-panel.hidden { display: none; }

@media (max-width: 480px) {
  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 14px 16px 12px;
  }
  .brand { font-size: 16px; }
  .topbar-right {
    width: 100%;
    justify-content: space-between;
    gap: 8px;
  }
  .hi-user {
    flex: 1 1 100%;
    font-size: 12px;
  }
  .tabs { padding: 0 16px 12px; }
  .tab-btn { flex: 1; text-align: center; padding: 7px 10px; }
}

.container { max-width: 960px; margin: 0 auto; padding: 24px 20px 60px; }

.summary { margin-bottom: 28px; }
.summary-card {
  background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 20px 24px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px;
}
.summary-label { font-size: 14px; color: var(--text-muted); font-weight: 600; }
.summary-totals { display: flex; gap: 18px; flex-wrap: wrap; }
.summary-amount { font-size: 22px; font-weight: 700; color: var(--primary); }

.shared-balance { margin-bottom: 20px; }
.balance-owe .summary-amount { color: var(--danger); }
.balance-even .summary-amount { color: var(--accent); font-size: 18px; }

.split-options { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }
.split-option {
  position: relative; flex: 1 1 30%; min-width: 90px; display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: 3px; padding: 14px 8px; border: 2px solid var(--border);
  border-radius: 12px; cursor: pointer; transition: border-color .12s ease, background .12s ease;
}
.split-option:hover { border-color: var(--primary); }
.split-option:focus-within { outline: 2px solid var(--primary); outline-offset: 2px; }
.split-radio {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.split-title { font-size: 14px; font-weight: 700; color: var(--text); }
.split-sub { font-size: 12px; color: var(--text-muted); }
.split-option.selected { border-color: var(--primary); background: #f2effe; }
.split-option.selected .split-title { color: var(--primary); }
.modal-hint { font-size: 13px; color: var(--text-muted); margin: -6px 0 10px; }
.modal-hint-inline { font-size: 11px; font-weight: 500; color: var(--text-muted); text-transform: none; }

.shared-toggle {
  position: relative; display: flex !important; align-items: center; gap: 10px;
  margin: 16px 0 0 !important; padding: 12px 14px; border: 2px solid var(--border);
  border-radius: 12px; cursor: pointer; transition: border-color .12s ease, background .12s ease;
}
.shared-toggle:hover { border-color: var(--primary); }
.shared-toggle:focus-within { outline: 2px solid var(--primary); outline-offset: 2px; }
.shared-toggle-input {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.shared-toggle-icon { font-size: 18px; }
.shared-toggle-text { font-size: 14px; font-weight: 600; color: var(--text); }
.shared-toggle.selected { border-color: var(--primary); background: #f2effe; }
.shared-toggle.selected .shared-toggle-text { color: var(--primary); }

.shared-fields {
  margin-top: 10px; padding: 12px; background: var(--bg); border-radius: 10px;
}
.shared-fields .modal-hint { margin: 0 0 10px; }
.shared-fields .split-options { margin-top: 0; }

.section-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 14px; flex-wrap: wrap; gap: 10px;
}
.section-head h2 { margin: 0; font-size: 18px; }

.btn-ghost {
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 9px 14px; font-size: 14px; cursor: pointer; color: var(--text);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

.btn-primary {
  background: var(--primary); color: #fff; border: none; border-radius: 10px;
  padding: 10px 18px; font-size: 14px; font-weight: 600; cursor: pointer;
}
.btn-primary:hover { background: var(--primary-dark); }

.btn-danger {
  background: var(--danger); color: #fff; border: none; border-radius: 10px;
  padding: 9px 14px; font-size: 14px; font-weight: 600; cursor: pointer;
}
.btn-danger:hover { background: #c0392b; }
.btn-danger:disabled { background: #f1a9a1; cursor: not-allowed; }
.modal-hint-danger {
  background: #fdecea; color: var(--danger); padding: 12px; border-radius: 10px;
  font-size: 13px; line-height: 1.5; margin: 0 0 14px;
}

.categories-section { margin-bottom: 34px; }
.category-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 12px;
}
.category-card {
  position: relative;
  background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 10px 16px; cursor: pointer; display: flex; flex-direction: column; align-items: center;
  gap: 8px; box-shadow: var(--shadow); transition: transform .12s ease, box-shadow .12s ease;
}
.category-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(31,36,48,0.12); border-color: var(--primary); }
.cat-icon { font-size: 26px; }
.cat-name { font-size: 13px; text-align: center; font-weight: 600; color: var(--text); }

.cat-actions {
  position: absolute; top: 6px; right: 6px; display: flex; gap: 2px;
}
.cat-action-btn {
  background: rgba(255,255,255,0.9); border: 1px solid var(--border); border-radius: 6px;
  width: 22px; height: 22px; font-size: 11px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center; padding: 0; opacity: 0.6;
}
.cat-action-btn:hover { background: var(--bg); opacity: 1; }

.filters { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.registro-section select {
  padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); font-size: 13px; background: #fff;
}
.table-wrap {
  background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); overflow-x: auto;
}
table { width: 100%; border-collapse: collapse; min-width: 520px; }
th, td { padding: 12px 16px; text-align: left; font-size: 14px; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
tr:last-child td { border-bottom: none; }
.amount-cell { font-weight: 700; white-space: nowrap; }
.note-cell { color: var(--text-muted); }
.actions-cell { white-space: nowrap; text-align: right; }
.icon-btn {
  background: none; border: none; cursor: pointer; font-size: 15px; padding: 4px 6px; border-radius: 6px;
}
.icon-btn:hover { background: var(--bg); }
.empty-state { text-align: center; color: var(--text-muted); padding: 30px 20px; font-size: 14px; }

/* Registro agrupado por categoria */
.registro-groups { }
.registro-group { border-bottom: 1px solid var(--border); }
.registro-group:last-child { border-bottom: none; }
.registro-group-header {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 10px;
  background: none; border: none; cursor: pointer; padding: 14px 16px; text-align: left;
  font-size: 14px; font-family: inherit;
}
.registro-group-header:hover { background: var(--bg); }
.registro-group-name { font-weight: 700; color: var(--text); flex: 1; }
.registro-group-totals { font-weight: 700; color: var(--primary); white-space: nowrap; font-size: 13px; }
.registro-group-chevron { color: var(--text-muted); transition: transform .15s ease; margin-left: 2px; }
.registro-group.expanded .registro-group-chevron { transform: rotate(180deg); }
.registro-group-body { display: none; padding: 0 16px 12px; }
.registro-group.expanded .registro-group-body { display: block; }
.registro-item {
  display: flex; align-items: center; gap: 10px; padding: 8px 0; border-top: 1px solid var(--bg);
  font-size: 13px;
}
.registro-item:first-child { border-top: none; }
.registro-item-date { color: var(--text-muted); white-space: nowrap; width: 84px; flex-shrink: 0; }
.registro-item-note { flex: 1; color: var(--text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.registro-item-amount { font-weight: 600; white-space: nowrap; }
.registro-item-actions { display: flex; gap: 2px; flex-shrink: 0; }

@media (max-width: 480px) {
  .registro-item-date { width: 62px; font-size: 12px; }
  .registro-group-totals { font-size: 12px; }
}

.modal-overlay {
  position: fixed; inset: 0; background: rgba(15,17,23,0.5);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity .15s ease; padding: 16px; z-index: 50;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal {
  background: #fff; border-radius: 16px; padding: 26px; width: 100%; max-width: 380px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
}
.modal h3 { margin: 0 0 16px; font-size: 18px; }
.modal label { display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin: 12px 0 6px; }
.modal input, .modal select {
  width: 100%; padding: 10px 12px; border-radius: 9px; border: 1px solid var(--border); font-size: 14px;
}
.amount-row { display: flex; gap: 8px; }
.amount-row input { flex: 1; }
.amount-row select { width: 110px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }

@media (max-width: 480px) {
  .summary-card { flex-direction: column; align-items: flex-start; }
  .category-grid { grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); }
}