/* ============================================================
   RESET Y VARIABLES
   Paleta basada en el logo: azul marino + blanco
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Paleta principal — derivada del logo */
  --navy:        #27448c;
  --navy-deep:   #1d3470;
  --navy-soft:   #3d5dae;
  --navy-tint:   #eef1f9;
  --navy-tint-2: #dde3f1;

  /* Neutrales (papel editorial) */
  --bg:        #f6f7fb;
  --paper:     #ffffff;
  --ink:       #1a2440;
  --ink-soft:  #3b4566;
  --muted:     #6b7591;
  --line:      #e1e5ef;
  --line-soft: #f0f2f8;

  /* Acentos funcionales */
  --accent:    var(--navy);
  --danger:    #b91c1c;
  --warn:      #b45309;
  --success:   #047857;

  /* Tipografías */
  --serif: 'Cormorant Garamond', Georgia, serif;
  --mono:  'JetBrains Mono', ui-monospace, monospace;
}

html, body { height: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; }

.hidden { display: none !important; }

/* ============================================================
   LOGIN
   ============================================================ */
.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 0%, rgba(39,68,140,0.08), transparent 50%),
    radial-gradient(circle at 80% 100%, rgba(39,68,140,0.06), transparent 50%),
    var(--bg);
}
.login-screen::before {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, var(--navy) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.04;
  pointer-events: none;
}

.login-wrap { position: relative; width: 100%; max-width: 440px; }

.login-mark {
  text-align: center;
  margin-bottom: 40px;
}
.login-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 96px;
  height: 96px;
  background: var(--navy);
  border-radius: 18px;
  padding: 14px;
  margin-bottom: 24px;
  box-shadow:
    0 10px 30px -10px rgba(39,68,140,0.45),
    0 4px 6px -2px rgba(39,68,140,0.15);
}
.login-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.login-mark-tag {
  display: inline-block;
  border-top: 2px solid var(--navy);
  border-bottom: 2px solid var(--navy);
  padding: 10px 22px;
  margin-bottom: 22px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--navy);
  text-transform: uppercase;
  font-weight: 500;
}
.login-mark h1 {
  font-family: var(--serif);
  font-size: 52px;
  font-weight: 500;
  line-height: 1;
  color: var(--ink);
  margin-bottom: 8px;
}
.login-mark h1 em {
  font-style: italic;
  display: block;
  font-weight: 400;
  color: var(--navy);
}
.login-sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.2em;
  margin-top: 16px;
}

.login-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy);
  padding: 32px;
  box-shadow:
    0 10px 25px -5px rgba(26,36,64,0.06),
    0 1px 2px rgba(0,0,0,0.03);
}
.login-card h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 26px;
  margin-bottom: 4px;
}
.login-card .login-help {
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 32px;
}

.field { margin-bottom: 20px; }
.field-label {
  display: block;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
  font-weight: 500;
}
.field-label .opt {
  color: var(--muted);
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
}
.field-required { color: var(--danger); }

.input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid #c9d1e3;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink);
  transition: all 0.15s ease;
}
.input:focus {
  outline: none;
  border-color: var(--navy);
  background: var(--paper);
  box-shadow: 0 0 0 3px rgba(39,68,140,0.12);
}
.input.error { border-color: var(--danger); }
.field-error {
  font-size: 11px;
  color: var(--danger);
  margin-top: 4px;
}

.input-with-icon { position: relative; }
.input-with-icon .toggle-pass {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  display: flex;
  padding: 4px;
}
.input-with-icon .toggle-pass:hover { color: var(--navy); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  font-weight: 500;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--navy);
  color: var(--paper);
}
.btn-primary:hover {
  background: var(--navy-deep);
  box-shadow: 0 6px 16px -6px rgba(39,68,140,0.5);
}
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background: var(--paper);
  color: var(--navy);
  border-color: #c9d1e3;
}
.btn-secondary:hover {
  background: var(--navy-tint);
  border-color: var(--navy);
}

.btn-danger {
  background: var(--danger);
  color: var(--paper);
}
.btn-danger:hover { background: #991b1b; }

.btn-block { width: 100%; justify-content: center; padding-block: 14px; margin-top: 32px; }

.login-demo {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 10px;
  color: #8a93ad;
  text-align: center;
  letter-spacing: 0.05em;
}
.login-demo b { color: var(--navy); font-weight: 500; }

/* ============================================================
   DASHBOARD - HEADER
   ============================================================ */
.app-header {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: var(--paper);
  border-bottom: 4px solid var(--navy-soft);
  box-shadow: 0 2px 8px rgba(29,52,112,0.12);
}
.app-header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.app-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}
.app-logo {
  width: 44px;
  height: 44px;
  background: var(--paper);
  border-radius: 10px;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.app-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.app-header-titles { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0 14px; }
.app-header h1 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  line-height: 1;
  color: var(--paper);
}
.app-header h1 em {
  color: #b8c7ed;
  font-weight: 400;
}
.app-header .header-tag {
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: #b8c7ed;
}
.btn-logout {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  border: 1px solid rgba(255,255,255,0.25);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper);
  border-radius: 4px;
  transition: all 0.15s;
}
.btn-logout:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.5);
}

/* ============================================================
   DASHBOARD - LAYOUT
   ============================================================ */
main.app-main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}
.section-head .eyebrow {
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.section-head h2 {
  font-family: var(--serif);
  font-size: 52px;
  font-weight: 500;
  line-height: 1;
  color: var(--ink);
}
.section-head h2 em {
  font-style: italic;
  font-weight: 400;
  color: var(--navy);
}
.section-head .total-amount-label {
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: right;
}
.section-head .total-amount {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 500;
  text-align: right;
  color: var(--navy);
}

/* Stat cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}
.stat-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--navy);
  padding: 24px;
  transition: transform 0.15s, box-shadow 0.15s;
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -8px rgba(29,52,112,0.15);
}
.stat-card.warn    { border-left-color: var(--warn); }
.stat-card.danger  { border-left-color: var(--danger); }
.stat-card.success { border-left-color: var(--success); }

.stat-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}
.stat-label {
  font-size: 10px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.stat-icon { display: flex; }
.stat-icon.neutral { color: var(--navy); }
.stat-icon.warn    { color: var(--warn); }
.stat-icon.danger  { color: var(--danger); }
.stat-icon.success { color: var(--success); }
.stat-value {
  font-family: var(--serif);
  font-size: 52px;
  font-weight: 500;
  line-height: 1;
  color: var(--ink);
}
.stat-sub {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.05em;
  margin-top: 8px;
}

/* Action bar */
.action-bar {
  background: var(--paper);
  border: 1px solid var(--line);
  border-bottom: none;
  padding: 20px;
}
.action-bar-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
}
.search-box { position: relative; flex: 1; max-width: 420px; min-width: 240px; }
.search-box svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
}
.search-box input {
  width: 100%;
  padding: 10px 16px 10px 40px;
  background: var(--bg);
  border: 1px solid #c9d1e3;
  font-family: var(--mono);
  font-size: 13px;
}
.search-box input:focus {
  outline: none;
  border-color: var(--navy);
  background: var(--paper);
  box-shadow: 0 0 0 3px rgba(39,68,140,0.12);
}
.action-buttons { display: flex; gap: 8px; flex-wrap: wrap; }

.filter-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.filter-chip {
  padding: 6px 12px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  background: var(--paper);
  color: var(--ink-soft);
  border: 1px solid #c9d1e3;
  transition: all 0.15s;
}
.filter-chip:hover { border-color: var(--navy); color: var(--navy); }
.filter-chip.active {
  background: var(--navy);
  color: var(--paper);
  border-color: var(--navy);
}
.filter-chip .count { opacity: 0.7; margin-left: 4px; }

/* Table */
.table-wrap {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: none;
  overflow-x: auto;
}
.alumnos-table { width: 100%; border-collapse: collapse; }
.alumnos-table thead tr { border-bottom: 2px solid var(--navy); }
.alumnos-table th {
  text-align: left;
  padding: 12px 20px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--navy);
  font-weight: 600;
  background: var(--navy-tint);
}
.alumnos-table th.text-right { text-align: right; }
.alumnos-table tbody tr {
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.1s;
}
.alumnos-table tbody tr:nth-child(even) { background: rgba(238,241,249,0.4); }
.alumnos-table tbody tr:hover { background: var(--navy-tint); }
.alumnos-table td {
  padding: 16px 20px;
  vertical-align: middle;
}
.td-id { font-size: 12px; color: var(--muted); width: 64px; font-weight: 500; }
.td-name {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 500;
  line-height: 1.2;
  color: var(--ink);
}
.td-cedula { font-size: 13px; color: var(--ink-soft); }
.td-cedula.empty { color: #c9d1e3; }
.td-monto { text-align: right; font-size: 13px; font-weight: 600; color: var(--navy); }
.td-fecha { font-size: 13px; color: var(--ink-soft); }

.row-actions {
  display: flex;
  justify-content: flex-end;
  gap: 4px;
}
.icon-btn {
  padding: 8px;
  color: var(--muted);
  display: flex;
  border-radius: 4px;
  transition: all 0.15s;
}
.icon-btn:hover { color: var(--navy); background: var(--navy-tint); }
.icon-btn.danger:hover { color: var(--danger); background: #fef2f2; }

.empty-state {
  padding: 80px 20px;
  text-align: center;
}
.empty-state .empty-title {
  font-family: var(--serif);
  font-size: 26px;
  font-style: italic;
  color: var(--muted);
  margin-bottom: 8px;
}
.empty-state .empty-sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.05em;
}

/* Estado badge */
.estado-wrap { display: inline-flex; flex-direction: column; gap: 2px; }
.estado-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border: 1px solid;
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
  width: fit-content;
}
.estado-badge.vencido { background: #fef2f2; color: #991b1b; border-color: #fecaca; }
.estado-badge.proximo { background: #fffbeb; color: #92400e; border-color: #fde68a; }
.estado-badge.al-dia  { background: #ecfdf5; color: #065f46; border-color: #a7f3d0; }
.estado-sub {
  font-size: 10px;
  color: var(--muted);
  margin-left: 4px;
}

/* Footer info */
.results-footer {
  margin-top: 24px;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-align: center;
}

/* ============================================================
   MODALES
   ============================================================ */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(26, 36, 64, 0.65);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow-y: auto;
  backdrop-filter: blur(2px);
}
.modal {
  background: var(--paper);
  width: 100%;
  max-width: 540px;
  border-top: 4px solid var(--navy);
  box-shadow: 0 25px 50px -12px rgba(26,36,64,0.4);
  margin: 32px 0;
}
.modal.confirm-modal { max-width: 440px; border-top-color: var(--danger); }

.modal-head {
  padding: 24px 32px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.modal-head .eyebrow {
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 4px;
  font-weight: 500;
}
.modal-head h3 {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
}
.modal-close {
  color: var(--muted);
  display: flex;
  padding: 4px;
}
.modal-close:hover { color: var(--navy); }

.modal-body { padding: 32px; }

.modal-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.modal-foot {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  margin-top: 24px;
}

.confirm-modal .modal-body { padding: 32px; }
.confirm-modal h3 {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 500;
  margin-bottom: 12px;
}
.confirm-modal p {
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 32px;
  line-height: 1.6;
}
.confirm-modal .modal-foot { border: none; padding: 0; margin: 0; }

/* ============================================================
   TOAST
   ============================================================ */
#toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 360px;
}
.toast {
  padding: 12px 20px;
  border-left: 4px solid;
  background: var(--paper);
  box-shadow: 0 10px 25px -5px rgba(26,36,64,0.2);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  animation: toast-in 0.25s ease-out;
}
.toast.success { background: #ecfdf5; border-color: var(--success); color: #064e3b; }
.toast.error   { background: #fef2f2; border-color: var(--danger);  color: #7f1d1d; }
.toast p { font-size: 13px; line-height: 1.5; flex: 1; }
.toast .toast-close { opacity: 0.6; padding: 2px; display: flex; }
.toast .toast-close:hover { opacity: 1; }

@keyframes toast-in {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 640px) {
  .login-mark h1 { font-size: 40px; }
  .login-logo { width: 80px; height: 80px; }
  .section-head h2 { font-size: 38px; }
  .stat-value { font-size: 42px; }
  .modal-grid-2 { grid-template-columns: 1fr; }
  .app-header .header-tag { display: none; }
  .app-logo { width: 38px; height: 38px; }
  .app-header h1 { font-size: 24px; }
  .alumnos-table { min-width: 720px; }
}