/* ═══════════════════════════════════════════════════════════════
   PUCSAR — Libros de Notas  v2.0
   Diseño: Sidebar oscuro institucional + contenido limpio
   Paleta: Verde oscuro (#0F1C0F) + Oro (#C9A840) + Blanco
   ═══════════════════════════════════════════════════════════════ */

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; scroll-behavior: smooth; }

/* ── Variables ───────────────────────────────────────────────── */
:root {
  --sb-bg:      #0D1B0E;
  --sb-bg2:     #162118;
  --sb-border:  #243124;
  --sb-text:    #9dbf9e;
  --sb-text-h:  #ffffff;
  --sb-active:  rgba(201,168,64,.13);
  --sb-active-b:#C9A840;
  --sb-width:   256px;

  --oro:        #C9A840;
  --oro2:       #DFC05A;
  --oro-bg:     rgba(201,168,64,.08);
  --verde:      #1B5E20;
  --verde2:     #2E7D32;
  --verde-lite: #E8F5E9;
  --rojo:       #B71C1C;
  --rojo-lite:  #FFEBEE;
  --azul:       #1565C0;

  --bg:         #F2F4F2;
  --surface:    #FFFFFF;
  --border:     #E0E5E0;
  --text:       #1A2B1A;
  --text-2:     #4A5E4A;
  --text-3:     #7A8E7A;

  --radius:     10px;
  --radius-sm:  6px;
  --shadow:     0 1px 4px rgba(0,0,0,.07), 0 4px 16px rgba(0,0,0,.05);
  --shadow-lg:  0 8px 40px rgba(0,0,0,.14);
}

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

/* ══════════════════════════════════════════════════════════════
   SIDEBAR
   ══════════════════════════════════════════════════════════════ */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sb-width);
  background: var(--sb-bg);
  display: flex;
  flex-direction: column;
  z-index: 200;
  border-right: 1px solid var(--sb-border);
  transition: transform .25s ease;
}

/* Logo / marca */
.sb-brand {
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--sb-border);
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.sb-brand img { width: 42px; height: 42px; object-fit: contain; flex-shrink: 0; }
.sb-brand-text { line-height: 1.2; }
.sb-brand-name {
  font-size: .8rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: .3px;
}
.sb-brand-sub {
  font-size: .65rem;
  color: var(--sb-text);
  margin-top: 1px;
}

/* Navegación */
.sb-nav { flex: 1; overflow-y: auto; padding: 12px 0; }
.sb-section {
  padding: 14px 18px 4px;
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--sb-border);
}
.sb-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  color: var(--sb-text);
  text-decoration: none;
  font-size: .83rem;
  font-weight: 500;
  transition: background .15s, color .15s;
  position: relative;
  border-left: 3px solid transparent;
}
.sb-link:hover {
  background: var(--sb-bg2);
  color: var(--sb-text-h);
  border-left-color: var(--sb-border);
}
.sb-link.active {
  background: var(--sb-active);
  color: var(--sb-text-h);
  border-left-color: var(--sb-active-b);
  font-weight: 600;
}
.sb-link .ico { font-size: .95rem; width: 18px; text-align: center; flex-shrink: 0; }
.sb-link .badge-count {
  margin-left: auto;
  background: var(--oro);
  color: #000;
  font-size: .6rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
}

/* Pie del sidebar */
.sb-footer {
  border-top: 1px solid var(--sb-border);
  padding: 14px 18px;
}
.sb-user {
  display: flex; align-items: center; gap: 10px;
}
.sb-avatar {
  width: 34px; height: 34px;
  background: var(--sb-active-b);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .82rem; color: #000;
  flex-shrink: 0;
}
.sb-user-info { flex: 1; min-width: 0; }
.sb-user-name {
  font-size: .8rem; font-weight: 600; color: #fff;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.sb-user-role {
  font-size: .65rem; color: var(--sb-text);
  text-transform: uppercase; letter-spacing: .5px;
}
.sb-logout {
  color: var(--sb-text);
  text-decoration: none;
  font-size: .85rem;
  padding: 4px;
  border-radius: 4px;
  transition: color .15s;
}
.sb-logout:hover { color: #fff; }

/* ══════════════════════════════════════════════════════════════
   ÁREA PRINCIPAL
   ══════════════════════════════════════════════════════════════ */
.main-wrap {
  margin-left: var(--sb-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Topbar */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  height: 58px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 0 var(--border);
}
.topbar-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  flex: 1;
}
.topbar-actions { display: flex; gap: 8px; align-items: center; }
.topbar-pin-alert {
  background: #FFF8E1;
  border: 1px solid var(--oro);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: .75rem;
  font-weight: 600;
  color: #7A5800;
  display: flex; align-items: center; gap: 6px;
}

/* Contenido */
.page-content {
  flex: 1;
  padding: 28px;
}

/* ══════════════════════════════════════════════════════════════
   COMPONENTES
   ══════════════════════════════════════════════════════════════ */

/* Cards */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.card-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.card-title {
  font-size: .88rem;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: .5px;
  display: flex; align-items: center; gap: 8px;
}
.card-title::before {
  content: '';
  display: block;
  width: 3px; height: 16px;
  background: var(--verde);
  border-radius: 2px;
}
.card-body { padding: 20px; }

/* Stats / KPIs */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  border-top: 3px solid var(--verde);
}
.stat-card.gold   { border-top-color: var(--oro); }
.stat-card.red    { border-top-color: var(--rojo); }
.stat-card.blue   { border-top-color: var(--azul); }
.stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  margin-bottom: 4px;
}
.stat-label { font-size: .75rem; color: var(--text-3); font-weight: 600; text-transform: uppercase; letter-spacing: .4px; }

/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  font-size: .82rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: all .15s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary  { background: var(--verde);  color: #fff; border-color: var(--verde); }
.btn-primary:hover { background: var(--verde2); }
.btn-gold     { background: var(--oro);    color: #1A1A00; border-color: var(--oro); }
.btn-gold:hover { background: var(--oro2); }
.btn-danger   { background: var(--rojo);   color: #fff; border-color: var(--rojo); }
.btn-danger:hover { opacity: .88; }
.btn-outline  { background: transparent; border-color: var(--border); color: var(--text-2); }
.btn-outline:hover { border-color: var(--verde); color: var(--verde); background: var(--verde-lite); }
.btn-ghost    { background: transparent; border-color: transparent; color: var(--text-2); padding: 8px 10px; }
.btn-ghost:hover { background: var(--bg); }
.btn-sm  { padding: 5px 11px; font-size: .76rem; }
.btn-xs  { padding: 3px 8px;  font-size: .7rem; }
.btn-block { width: 100%; justify-content: center; }
.btn-lg  { padding: 12px 24px; font-size: .92rem; }

/* Formularios */
.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }
.form-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-row.cols-1 { grid-template-columns: 1fr; }
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-label {
  font-size: .76rem;
  font-weight: 700;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: .4px;
}
.form-control {
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .88rem;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  transition: border-color .15s, box-shadow .15s;
  width: 100%;
}
.form-control:focus {
  border-color: var(--verde);
  outline: none;
  box-shadow: 0 0 0 3px rgba(27,94,32,.1);
}
select.form-control { cursor: pointer; }
textarea.form-control { resize: vertical; min-height: 80px; }
.form-hint { font-size: .72rem; color: var(--text-3); }
.form-full { grid-column: 1 / -1; }

/* Alertas */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  font-weight: 500;
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.alert::before { font-size: 1rem; flex-shrink: 0; }
.alert-success { background: #E8F5E9; color: #1B5E20; border-left: 4px solid #2E7D32; }
.alert-success::before { content: '✓'; }
.alert-danger  { background: var(--rojo-lite); color: var(--rojo); border-left: 4px solid var(--rojo); }
.alert-danger::before { content: '✕'; }
.alert-warning { background: #FFF8E1; color: #7A5800; border-left: 4px solid var(--oro); }
.alert-warning::before { content: '⚠'; }
.alert-info    { background: #E3F2FD; color: #1565C0; border-left: 4px solid var(--azul); }
.alert-info::before { content: 'ℹ'; }

/* Tablas */
.table-wrap { overflow-x: auto; }
table.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: .83rem;
}
table.tbl thead th {
  background: #F7F9F7;
  color: var(--text-2);
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  padding: 10px 14px;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
  position: sticky;
  top: 0;
}
table.tbl tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid #F0F4F0;
  vertical-align: middle;
}
table.tbl tbody tr:hover td { background: #F7FBF7; }
table.tbl tbody tr:last-child td { border-bottom: none; }
table.tbl.compact thead th { padding: 7px 10px; }
table.tbl.compact tbody td  { padding: 7px 10px; }

/* Tabla de notas (gradebook) */
table.gradebook thead th {
  background: var(--sb-bg);
  color: #fff;
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .4px;
  padding: 8px 6px;
  border: 1px solid var(--sb-border);
  text-align: center;
  white-space: nowrap;
}
table.gradebook thead th.col-fixed {
  background: #1B2B1E;
  text-align: left;
  padding-left: 10px;
}
table.gradebook thead th.col-eval {
  background: #1A3A1C;
}
table.gradebook thead th.col-def {
  background: #6B3A00;
}
table.gradebook tbody td {
  padding: 5px 6px;
  border: 1px solid #E8EDE8;
  vertical-align: middle;
}
table.gradebook tbody td.col-fixed {
  font-weight: 500;
  background: #FAFBFA;
  white-space: nowrap;
}
table.gradebook tbody td.pond {
  color: var(--text-3);
  font-size: .77rem;
  text-align: right;
  background: #F9FBF9;
}
table.gradebook tbody td.def {
  font-weight: 800;
  text-align: center;
  background: #FFF8E1;
  color: #5A3800;
}
table.gradebook input.nota-inp {
  width: 56px;
  text-align: right;
  padding: 4px 5px;
  border: 1.5px solid var(--border);
  border-radius: 4px;
  font-size: .83rem;
  font-family: inherit;
  background: #fff;
  transition: border-color .15s;
}
table.gradebook input.nota-inp:focus {
  border-color: var(--verde);
  outline: none;
  background: #F0FFF0;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  border-radius: 20px;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .3px;
  white-space: nowrap;
}
.badge-green  { background: #E8F5E9; color: #1B5E20; }
.badge-gold   { background: #FFF8E1; color: #7A5800; }
.badge-red    { background: var(--rojo-lite); color: var(--rojo); }
.badge-gray   { background: #F1F3F1; color: #5A6E5A; }
.badge-blue   { background: #E3F2FD; color: #1565C0; }

/* Rol badge en sidebar */
.role-chip {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 10px;
  font-size: .6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.role-admin    { background: #6C1D14; color: #FFB3A7; }
.role-decano   { background: #5A4400; color: #FFD980; }
.role-profesor { background: #143B1A; color: #7DD87D; }
.role-operador { background: #1A2B3A; color: #80B4CC; }

/* Breadcrumb */
.breadcrumb {
  display: flex; align-items: center; gap: 6px;
  font-size: .77rem; color: var(--text-3);
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--verde); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb-sep { color: var(--text-3); }

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 20px;
}
.tab-btn {
  padding: 10px 18px;
  font-size: .83rem;
  font-weight: 600;
  color: var(--text-3);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  font-family: inherit;
  transition: all .15s;
}
.tab-btn:hover { color: var(--verde); }
.tab-btn.active { color: var(--verde); border-bottom-color: var(--verde); }
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* Búsqueda */
.search-bar {
  display: flex; gap: 8px;
  margin-bottom: 16px;
}
.search-bar input {
  flex: 1;
  padding: 9px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .88rem;
  font-family: inherit;
}
.search-bar input:focus { border-color: var(--verde); outline: none; }

/* Toggle switch */
.toggle { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.toggle input { display: none; }
.toggle-track {
  width: 36px; height: 20px;
  background: #ccc; border-radius: 10px;
  position: relative; transition: background .2s;
}
.toggle input:checked + .toggle-track { background: var(--verde2); }
.toggle-track::after {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  background: #fff;
  border-radius: 50%;
  top: 2px; left: 2px;
  transition: transform .2s;
}
.toggle input:checked + .toggle-track::after { transform: translateX(16px); }
.toggle-label { font-size: .83rem; color: var(--text-2); }

/* Paginación */
.pagination { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 16px; }
.page-btn {
  padding: 5px 11px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .78rem;
  font-weight: 600;
  color: var(--text-2);
  text-decoration: none;
  transition: all .15s;
}
.page-btn:hover { border-color: var(--verde); color: var(--verde); }
.page-btn.active { background: var(--verde); color: #fff; border-color: var(--verde); }

/* Divider */
.divider { height: 1px; background: var(--border); margin: 20px 0; }

/* Spinner */
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--verde);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Toast */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast {
  background: #1A2B1A;
  color: #fff;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: .84rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--verde);
  max-width: 340px;
  transform: translateX(120%);
  transition: transform .3s ease;
}
.toast.show { transform: translateX(0); }
.toast.error { border-left-color: var(--rojo); }

/* ══════════════════════════════════════════════════════════════
   LOGIN PAGE
   ══════════════════════════════════════════════════════════════ */
.login-page {
  min-height: 100vh;
  background: linear-gradient(145deg, #0D1B0E 0%, #162118 50%, #0D1B0E 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.login-box {
  width: 100%;
  max-width: 420px;
}
.login-card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
  overflow: hidden;
}
.login-head {
  background: var(--sb-bg);
  padding: 32px 32px 24px;
  text-align: center;
  border-bottom: 3px solid var(--oro);
}
.login-head img { height: 72px; width: auto; }
.login-head h1 {
  font-size: 1.05rem; font-weight: 800; color: #fff;
  margin-top: 14px; letter-spacing: .3px;
}
.login-head p { font-size: .75rem; color: var(--sb-text); margin-top: 4px; }
.login-body { padding: 28px 32px 32px; }
.login-body .form-label { color: #444; }
.login-body .form-control { background: #F8FAF8; }
.login-body .form-control:focus { background: #fff; }
.login-footer {
  text-align: center;
  font-size: .72rem;
  color: var(--text-3);
  margin-top: 20px;
}
.lock-msg {
  background: var(--rojo-lite);
  color: var(--rojo);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: .82rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════════ */
.sb-toggle {
  display: none;
  position: fixed;
  top: 12px; left: 12px;
  z-index: 300;
  background: var(--sb-bg);
  color: #fff;
  border: none;
  border-radius: 8px;
  width: 38px; height: 38px;
  font-size: 1.1rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-wrap { margin-left: 0; }
  .sb-toggle { display: flex; }
  .sb-overlay {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 199;
  }
  .sb-overlay.show { display: block; }
  .topbar { padding-left: 60px; }
  .page-content { padding: 16px; }
  .form-row { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .login-head { padding: 24px 20px 20px; }
  .login-body { padding: 20px; }
}

/* ══════════════════════════════════════════════════════════════
   UTILIDADES
   ══════════════════════════════════════════════════════════════ */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.flex  { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.text-sm { font-size: .78rem; }
.text-xs { font-size: .7rem; }
.text-muted { color: var(--text-3); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.fw-bold { font-weight: 700; }
.d-none { display: none; }
.w-100 { width: 100%; }
code { font-family: 'SF Mono', 'Fira Code', monospace; font-size: .85em;
       background: #F0F4F0; padding: 1px 5px; border-radius: 3px; }
.empty-state {
  text-align: center; padding: 48px 20px; color: var(--text-3);
}
.empty-state .ico { font-size: 2.5rem; margin-bottom: 10px; }
.empty-state p { font-size: .88rem; }