@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,600;0,700;1,600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ═══════════════════════════════════════════════════════════
   VARIABLES
═══════════════════════════════════════════════════════════ */
:root {
  --c-primary-950: #0f0e2a;
  --c-primary-900: #1e1b4b;
  --c-primary-800: #2d2a6e;
  --c-primary-700: #312e81;
  --c-primary-600: #4338ca;
  --c-primary-500: #6366f1;
  --c-primary-400: #818cf8;
  --c-primary-300: #a5b4fc;
  --c-primary-200: #c7d2fe;
  --c-primary-100: #e0e7ff;
  --c-primary-50:  #eef2ff;

  --c-accent:       #d97706;
  --c-accent-hover: #b45309;
  --c-accent-light: #fef3c7;
  --c-accent-pale:  #fffbeb;

  --c-success:       #059669;
  --c-success-light: #d1fae5;
  --c-success-bg:    #ecfdf5;
  --c-danger:        #dc2626;
  --c-danger-light:  #fee2e2;
  --c-danger-bg:     #fef2f2;
  --c-warning:       #d97706;
  --c-warning-light: #fef3c7;
  --c-warning-bg:    #fffbeb;
  --c-info:          #0284c7;
  --c-info-light:    #e0f2fe;
  --c-info-bg:       #f0f9ff;

  --c-surface: #ffffff;
  --c-bg:      #f4f3fb;
  --c-bg-2:    #eceafb;

  --c-text:   #1e1b4b;
  --c-text-2: #4b5563;
  --c-text-3: #9ca3af;
  --c-text-4: #d1d5db;

  --c-border:   #e5e7eb;
  --c-border-2: #d1d5db;

  --font-body:    'Outfit', sans-serif;
  --font-display: 'Playfair Display', serif;
  --font-mono:    'JetBrains Mono', monospace;

  --sidebar-w: 244px;
  --radius-xs:   4px;
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   22px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 4px rgba(30,27,75,.08), 0 1px 2px rgba(30,27,75,.05);
  --shadow-md: 0 4px 12px rgba(30,27,75,.10), 0 2px 4px rgba(30,27,75,.06);
  --shadow-lg: 0 10px 30px rgba(30,27,75,.12), 0 4px 8px rgba(30,27,75,.07);
  --shadow-xl: 0 20px 50px rgba(30,27,75,.15), 0 8px 16px rgba(30,27,75,.08);

  --t-fast: 0.12s ease;
  --t-base: 0.18s ease;
  --t-slow: 0.28s ease;
}

/* ═══════════════════════════════════════════════════════════
   RESET
═══════════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-body); color: var(--c-text); background: var(--c-bg); line-height: 1.6; min-height: 100vh; }
img  { max-width: 100%; display: block; }
a    { color: inherit; text-decoration: none; }
button, input, select, textarea { font-family: inherit; }
button { cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }

/* ═══════════════════════════════════════════════════════════
   TYPOGRAPHY
═══════════════════════════════════════════════════════════ */
h1  { font-family: var(--font-display); font-size: 1.8rem; font-weight: 700; line-height: 1.25; }
h2  { font-family: var(--font-display); font-size: 1.4rem; font-weight: 600; line-height: 1.3; }
h3  { font-size: 1.05rem; font-weight: 600; }
h4  { font-size: .92rem;  font-weight: 600; }
h5  { font-size: .78rem;  font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--c-text-3); }
p   { color: var(--c-text-2); line-height: 1.65; }
small { font-size: .78rem; color: var(--c-text-3); }
code { font-family: var(--font-mono); font-size: .84em; background: var(--c-bg-2); padding: 2px 6px; border-radius: var(--radius-xs); color: var(--c-primary-700); }

/* ═══════════════════════════════════════════════════════════
   BUTTONS
═══════════════════════════════════════════════════════════ */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px; border-radius: var(--radius-md);
  font-size: .88rem; font-weight: 500; line-height: 1;
  white-space: nowrap;
  transition: background var(--t-fast), border-color var(--t-fast),
              box-shadow var(--t-fast), transform var(--t-fast);
  border: 1.5px solid transparent;
}
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .5; pointer-events: none; }

.btn-primary { background: var(--c-primary-600); color: #fff; box-shadow: 0 2px 8px rgba(67,56,202,.28); }
.btn-primary:hover { background: var(--c-primary-700); box-shadow: 0 4px 14px rgba(67,56,202,.38); }
.btn-accent  { background: var(--c-accent); color: #fff; }
.btn-accent:hover { background: var(--c-accent-hover); }
.btn-success { background: var(--c-success); color: #fff; }
.btn-danger  { background: var(--c-danger);  color: #fff; }
.btn-danger:hover  { background: #b91c1c; }
.btn-warning { background: var(--c-warning); color: #fff; }
.btn-outline { background: transparent; color: var(--c-primary-600); border-color: var(--c-primary-400); }
.btn-outline:hover { background: var(--c-primary-50); border-color: var(--c-primary-600); }
.btn-ghost   { background: transparent; color: var(--c-text-2); border-color: var(--c-border-2); }
.btn-ghost:hover   { background: var(--c-bg); }
.btn-white   { background: rgba(255,255,255,.13); color: #fff; border-color: rgba(255,255,255,.22); }
.btn-white:hover   { background: rgba(255,255,255,.22); }

.btn-xs   { padding: 4px 10px; font-size: .74rem; border-radius: var(--radius-sm); }
.btn-sm   { padding: 6px 13px; font-size: .82rem; border-radius: var(--radius-sm); }
.btn-lg   { padding: 13px 28px; font-size: .98rem; }
.btn-xl   { padding: 16px 36px; font-size: 1.05rem; }
.btn-full { width: 100%; justify-content: center; }
.btn-icon { padding: 8px; aspect-ratio: 1; border-radius: var(--radius-md); }
.btn-icon.btn-sm { padding: 6px; border-radius: var(--radius-sm); }

/* ═══════════════════════════════════════════════════════════
   CARDS
═══════════════════════════════════════════════════════════ */
.card {
  background: var(--c-surface); border-radius: var(--radius-lg);
  border: 1px solid var(--c-border); box-shadow: var(--shadow-sm);
  padding: 1.25rem 1.5rem;
}
.card-sm    { padding: .9rem 1.1rem; }
.card-flush { padding: 0; overflow: hidden; }
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.1rem; gap: .5rem;
}
.card-title    { font-size: .95rem; font-weight: 600; color: var(--c-text); }
.card-subtitle { font-size: .76rem; color: var(--c-text-3); margin-top: 2px; }
.card-footer {
  border-top: 1px solid var(--c-border); padding-top: .9rem; margin-top: 1rem;
  display: flex; align-items: center; justify-content: flex-end; gap: .5rem;
}
.card-hover { transition: box-shadow var(--t-base), transform var(--t-base); cursor: pointer; }
.card-hover:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

/* ═══════════════════════════════════════════════════════════
   FORMS
═══════════════════════════════════════════════════════════ */
.form-group { display: flex; flex-direction: column; gap: 5px; margin-bottom: 1rem; }
.form-group:last-child { margin-bottom: 0; }
.form-label { font-size: .82rem; font-weight: 600; color: var(--c-text); display: flex; align-items: center; gap: 4px; }
.form-label .req { color: var(--c-danger); }

.form-input, .form-select, .form-textarea {
  width: 100%; padding: 9px 12px;
  border: 1.5px solid var(--c-border-2); border-radius: var(--radius-md);
  font-size: .88rem; font-family: var(--font-body);
  color: var(--c-text); background: var(--c-surface);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  outline: none; -webkit-appearance: none;
}
.form-input::placeholder { color: var(--c-text-3); }
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--c-primary-500);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
}
.form-input.is-valid   { border-color: var(--c-success); }
.form-input.is-invalid { border-color: var(--c-danger); }
.form-input.is-invalid:focus { box-shadow: 0 0 0 3px rgba(220,38,38,.12); }
.form-textarea { resize: vertical; min-height: 80px; line-height: 1.6; }
.form-hint  { font-size: .75rem; color: var(--c-text-3); line-height: 1.4; }
.form-error { font-size: .75rem; color: var(--c-danger); }
.form-success { font-size: .75rem; color: var(--c-success); }
.form-row   { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: .75rem; }

/* RUT input feedback */
.rut-wrap { position: relative; }
.rut-status {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  font-size: .8rem; font-weight: 600; pointer-events: none;
}
.rut-status.ok  { color: var(--c-success); }
.rut-status.err { color: var(--c-danger); }

/* Checkbox pills */
.checkbox-group { display: flex; flex-wrap: wrap; gap: 6px; }
.checkbox-pill {
  display: flex; align-items: center; gap: 6px; padding: 6px 13px;
  border-radius: var(--radius-full); border: 1.5px solid var(--c-border-2);
  font-size: .82rem; font-weight: 500; color: var(--c-text-2);
  cursor: pointer; user-select: none; transition: all var(--t-fast);
}
.checkbox-pill input { display: none; }
.checkbox-pill:hover { border-color: var(--c-primary-400); }
.checkbox-pill:has(input:checked) {
  background: var(--c-primary-100); border-color: var(--c-primary-500);
  color: var(--c-primary-700); font-weight: 600;
}

/* Multi-select chips (para Resultados Generales) */
.multiselect-wrap { position: relative; }
.multiselect-display {
  min-height: 40px; padding: 6px 10px;
  border: 1.5px solid var(--c-border-2); border-radius: var(--radius-md);
  cursor: pointer; display: flex; flex-wrap: wrap; gap: 5px; align-items: center;
  background: var(--c-surface);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.multiselect-display:focus-within,
.multiselect-display.open {
  border-color: var(--c-primary-500);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
}
.ms-chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: var(--radius-full);
  background: var(--c-primary-100); color: var(--c-primary-700);
  font-size: .76rem; font-weight: 600;
}
.ms-chip-x { cursor: pointer; font-size: .65rem; opacity: .6; }
.ms-chip-x:hover { opacity: 1; }
.ms-placeholder { color: var(--c-text-3); font-size: .86rem; }
.multiselect-dropdown {
  position: absolute; top: calc(100% + 4px); left: 0; right: 0; z-index: 200;
  background: var(--c-surface); border: 1.5px solid var(--c-border-2);
  border-radius: var(--radius-md); box-shadow: var(--shadow-md);
  max-height: 220px; overflow-y: auto; display: none;
}
.multiselect-dropdown.open { display: block; }
.ms-option {
  padding: 8px 12px; font-size: .86rem; cursor: pointer;
  display: flex; align-items: center; gap: 8px;
  transition: background var(--t-fast);
}
.ms-option:hover { background: var(--c-primary-50); }
.ms-option.selected { background: var(--c-primary-50); color: var(--c-primary-700); font-weight: 500; }
.ms-option-check { width: 16px; height: 16px; border-radius: 4px; border: 1.5px solid var(--c-border-2); display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: .7rem; }
.ms-option.selected .ms-option-check { background: var(--c-primary-600); border-color: var(--c-primary-600); color: #fff; }

/* Toggle */
.toggle-wrap { display: flex; align-items: center; gap: 9px; }
.toggle {
  position: relative; width: 40px; height: 22px; flex-shrink: 0;
  background: var(--c-border-2); border-radius: var(--radius-full);
  cursor: pointer; transition: background var(--t-fast);
}
.toggle input { display: none; }
.toggle-thumb {
  position: absolute; top: 3px; left: 3px;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; transition: transform var(--t-base);
  box-shadow: 0 1px 3px rgba(0,0,0,.22);
}
.toggle:has(input:checked) { background: var(--c-primary-600); }
.toggle:has(input:checked) .toggle-thumb { transform: translateX(18px); }
.toggle-label { font-size: .85rem; color: var(--c-text-2); font-weight: 500; }

/* Color swatches */
.color-picker { display: flex; flex-wrap: wrap; gap: 7px; }
.color-swatch {
  width: 26px; height: 26px; border-radius: 50%;
  border: 2.5px solid transparent; cursor: pointer;
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}
.color-swatch:hover { transform: scale(1.1); }
.color-swatch.selected {
  border-color: var(--c-primary-900);
  box-shadow: 0 0 0 2px var(--c-surface), 0 0 0 4px var(--c-primary-600);
  transform: scale(1.15);
}

/* Number inputs with label (para parámetros de operaciones) */
.param-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.param-field { display: flex; flex-direction: column; gap: 3px; }
.param-field label { font-size: .72rem; font-weight: 600; color: var(--c-text-3); text-transform: uppercase; letter-spacing: .04em; }
.param-field input { width: 80px; padding: 6px 8px; font-size: .84rem; font-family: var(--font-mono); border: 1.5px solid var(--c-border-2); border-radius: var(--radius-sm); text-align: center; outline: none; }
.param-field input:focus { border-color: var(--c-primary-500); box-shadow: 0 0 0 2px rgba(99,102,241,.12); }
.param-sep { color: var(--c-text-3); font-size: .8rem; margin-top: 16px; }

/* ═══════════════════════════════════════════════════════════
   BADGES
═══════════════════════════════════════════════════════════ */
.badge {
  display: inline-flex; align-items: center; gap: 5px; padding: 3px 9px;
  border-radius: var(--radius-full); font-size: .72rem; font-weight: 600;
  line-height: 1.5; white-space: nowrap;
}
.badge-primary { background: var(--c-primary-100); color: var(--c-primary-800); }
.badge-accent  { background: var(--c-accent-light); color: #92400e; }
.badge-success { background: var(--c-success-light); color: #065f46; }
.badge-danger  { background: var(--c-danger-light);  color: #991b1b; }
.badge-warning { background: var(--c-warning-light); color: #92400e; }
.badge-info    { background: var(--c-info-light);    color: #0c4a6e; }
.badge-gray    { background: #f3f4f6; color: var(--c-text-2); }
.badge-dot::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex-shrink: 0; }

@keyframes pulse-dot { 0%,100%{opacity:1} 50%{opacity:.4} }
.live-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-success); animation: pulse-dot 1.4s ease-in-out infinite; }
.live-indicator { display: flex; align-items: center; gap: 6px; font-size: .75rem; font-weight: 600; color: var(--c-success); }

/* Inconsistency alert badges */
.alert-badge {
  display: flex; align-items: flex-start; gap: 10px; padding: .85rem 1rem;
  border-radius: var(--radius-md); margin-bottom: .5rem; font-size: .85rem;
}
.alert-badge-error   { background: var(--c-danger-bg);  border: 1px solid #fecaca; }
.alert-badge-warning { background: var(--c-warning-bg); border: 1px solid #fde68a; }
.alert-badge-info    { background: var(--c-info-bg);    border: 1px solid #bae6fd; }
.alert-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }
.alert-body { flex: 1; }
.alert-msg  { font-weight: 500; color: var(--c-text); line-height: 1.4; }
.alert-detail { font-size: .76rem; color: var(--c-text-3); margin-top: 2px; }
.alert-actions { display: flex; gap: .4rem; margin-top: .5rem; }

/* ═══════════════════════════════════════════════════════════
   METRIC CARDS
═══════════════════════════════════════════════════════════ */
.metrics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .85rem; }
.metric-card {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-lg); padding: 1rem 1.2rem;
  display: flex; flex-direction: column; gap: 3px;
}
.metric-label { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--c-text-3); }
.metric-value { font-size: 2rem; font-weight: 700; color: var(--c-text); line-height: 1.1; }
.metric-sub   { font-size: .76rem; color: var(--c-text-3); }
.metric-card.m-primary .metric-value { color: var(--c-primary-600); }
.metric-card.m-success .metric-value { color: var(--c-success); }
.metric-card.m-accent  .metric-value { color: var(--c-accent); }
.metric-card.m-danger  .metric-value { color: var(--c-danger); }

/* ═══════════════════════════════════════════════════════════
   TABLES
═══════════════════════════════════════════════════════════ */
.table-wrap { overflow-x: auto; border-radius: var(--radius-md); border: 1px solid var(--c-border); }
table { width: 100%; border-collapse: collapse; font-size: .85rem; }
thead { background: var(--c-bg); }
thead th {
  padding: 10px 14px; text-align: left;
  font-size: .72rem; font-weight: 700; color: var(--c-text-3);
  text-transform: uppercase; letter-spacing: .05em;
  border-bottom: 1px solid var(--c-border); white-space: nowrap;
}
tbody td { padding: 11px 14px; border-top: 1px solid var(--c-border); color: var(--c-text-2); vertical-align: middle; }
tbody tr:hover td { background: var(--c-primary-50); }
.td-mono { font-family: var(--font-mono); font-size: .8rem; }

/* Nota cell coloring */
.nota-cell { font-weight: 700; font-family: var(--font-mono); }
.nota-7    { color: #065f46; }
.nota-alta { color: var(--c-success); }
.nota-med  { color: var(--c-accent); }
.nota-baja { color: var(--c-danger); }

/* ═══════════════════════════════════════════════════════════
   MODAL
═══════════════════════════════════════════════════════════ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(15,10,40,.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; padding: 1rem;
  opacity: 0; pointer-events: none; transition: opacity .22s ease;
  backdrop-filter: blur(4px);
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--c-surface); border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl); padding: 2rem; width: 100%; max-width: 600px;
  max-height: 90vh; overflow-y: auto; border: 1px solid var(--c-border);
  transform: translateY(18px) scale(.96);
  transition: transform .24s cubic-bezier(.34,1.56,.64,1);
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }
.modal-xl  { max-width: 820px; }
.modal-xxl { max-width: 1000px; }
.modal-sm  { max-width: 420px; }
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 1px solid var(--c-border);
}
.modal-title { font-size: 1.1rem; font-weight: 700; }
.modal-close { width: 30px; height: 30px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: var(--c-text-3); font-size: .9rem; transition: background var(--t-fast); }
.modal-close:hover { background: var(--c-bg); color: var(--c-text); }
.modal-footer { display: flex; gap: 8px; justify-content: flex-end; margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--c-border); }

/* ═══════════════════════════════════════════════════════════
   SLIDE-IN PANEL LATERAL  v2.0
   (para lista de estudiantes de un curso)
═══════════════════════════════════════════════════════════ */
.side-panel-overlay {
  position: fixed; inset: 0; background: rgba(15,10,40,.45);
  z-index: 900; opacity: 0; pointer-events: none; transition: opacity .25s ease;
  backdrop-filter: blur(2px);
}
.side-panel-overlay.open { opacity: 1; pointer-events: all; }

.side-panel {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: 480px; max-width: 95vw;
  background: var(--c-surface); border-left: 1px solid var(--c-border);
  box-shadow: var(--shadow-xl); z-index: 901;
  display: flex; flex-direction: column;
  transform: translateX(100%); transition: transform .28s cubic-bezier(.34,1.26,.64,1);
}
.side-panel-overlay.open .side-panel { transform: translateX(0); }

.side-panel-header {
  padding: 1.2rem 1.5rem; border-bottom: 1px solid var(--c-border);
  display: flex; align-items: center; justify-content: space-between; flex-shrink: 0;
}
.side-panel-title { font-size: 1rem; font-weight: 700; }
.side-panel-body  { flex: 1; overflow-y: auto; padding: 1.2rem 1.5rem; }
.side-panel-footer {
  padding: 1rem 1.5rem; border-top: 1px solid var(--c-border);
  display: flex; gap: .5rem; justify-content: flex-end; flex-shrink: 0;
}

/* Student list item */
.est-item {
  display: flex; align-items: center; gap: 10px; padding: .7rem .8rem;
  border-radius: var(--radius-md); transition: background var(--t-fast);
}
.est-item:hover { background: var(--c-bg); }
.est-avatar {
  width: 34px; height: 34px; border-radius: 50%; flex-shrink: 0;
  background: var(--c-primary-100); color: var(--c-primary-700);
  display: flex; align-items: center; justify-content: center;
  font-size: .78rem; font-weight: 700;
}
.est-info { flex: 1; min-width: 0; }
.est-nombre { font-size: .88rem; font-weight: 600; color: var(--c-text); }
.est-rut    { font-size: .74rem; color: var(--c-text-3); font-family: var(--font-mono); }
.est-actions { display: flex; gap: .3rem; opacity: 0; transition: opacity var(--t-fast); }
.est-item:hover .est-actions { opacity: 1; }

/* ═══════════════════════════════════════════════════════════
   TABS
═══════════════════════════════════════════════════════════ */
.tab-list { display: flex; gap: 2px; border-bottom: 2px solid var(--c-border); margin-bottom: 1.5rem; overflow-x: auto; scrollbar-width: none; }
.tab-list::-webkit-scrollbar { display: none; }
.tab-btn {
  padding: 9px 16px; font-size: .84rem; font-weight: 500; color: var(--c-text-3);
  border-bottom: 2px solid transparent; margin-bottom: -2px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0; white-space: nowrap;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
  display: flex; align-items: center; gap: 6px;
}
.tab-btn:hover { color: var(--c-primary-600); background: var(--c-primary-50); }
.tab-btn.active { color: var(--c-primary-600); border-color: var(--c-primary-600); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn .2s ease; }

/* Mode selector tabs (para Progresión por Curso / por Estudiante) */
.mode-tabs { display: flex; gap: .5rem; margin-bottom: 1.5rem; }
.mode-tab {
  flex: 1; padding: .85rem 1rem; border-radius: var(--radius-lg);
  border: 2px solid var(--c-border); cursor: pointer; text-align: center;
  transition: all var(--t-base); background: var(--c-surface);
}
.mode-tab:hover { border-color: var(--c-primary-400); background: var(--c-primary-50); }
.mode-tab.active { border-color: var(--c-primary-600); background: var(--c-primary-50); }
.mode-tab-icon  { font-size: 1.4rem; margin-bottom: .3rem; }
.mode-tab-label { font-size: .88rem; font-weight: 600; color: var(--c-text-2); }
.mode-tab.active .mode-tab-label { color: var(--c-primary-700); }

/* ═══════════════════════════════════════════════════════════
   TOAST
═══════════════════════════════════════════════════════════ */
#toast-container { position: fixed; top: 20px; right: 20px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; pointer-events: none; }
.toast {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px; border-radius: var(--radius-md);
  font-size: .86rem; font-weight: 500; color: #fff;
  max-width: 340px; box-shadow: var(--shadow-lg); pointer-events: all;
  animation: slideInRight .25s cubic-bezier(.34,1.56,.64,1);
}
.toast-success { background: var(--c-success); }
.toast-error   { background: var(--c-danger); }
.toast-info    { background: var(--c-primary-600); }
.toast-warning { background: var(--c-accent); }
@keyframes slideInRight { from { transform: translateX(110%); opacity:0; } to { transform: translateX(0); opacity:1; } }

/* ═══════════════════════════════════════════════════════════
   LOADING / EMPTY
═══════════════════════════════════════════════════════════ */
.spinner { width: 32px; height: 32px; border: 3px solid var(--c-border); border-top-color: var(--c-primary-600); border-radius: 50%; animation: spin .65s linear infinite; }
.spinner-sm { width: 18px; height: 18px; border-width: 2px; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-wrap { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 200px; gap: 1rem; color: var(--c-text-3); font-size: .88rem; }

.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 3rem 1rem; text-align: center; gap: .5rem; }
.empty-icon  { font-size: 2.6rem; line-height: 1; margin-bottom: .5rem; }
.empty-state h4 { color: var(--c-text-2); font-size: .98rem; }
.empty-state p  { color: var(--c-text-3); font-size: .86rem; max-width: 280px; }

/* ═══════════════════════════════════════════════════════════
   ESCALA DE NOTAS  v2.0
═══════════════════════════════════════════════════════════ */
.escala-card {
  background: var(--c-bg); border: 1px solid var(--c-border);
  border-radius: var(--radius-md); padding: 1rem 1.2rem;
}
.escala-title { font-size: .82rem; font-weight: 700; color: var(--c-text-3); text-transform: uppercase; letter-spacing: .05em; margin-bottom: .75rem; }
.escala-grid  { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.escala-field { display: flex; flex-direction: column; gap: 3px; }
.escala-field label { font-size: .74rem; font-weight: 600; color: var(--c-text-3); }
.escala-field input { padding: 6px 9px; border: 1.5px solid var(--c-border-2); border-radius: var(--radius-sm); font-size: .88rem; font-family: var(--font-mono); width: 100%; outline: none; text-align: center; }
.escala-field input:focus { border-color: var(--c-primary-500); box-shadow: 0 0 0 2px rgba(99,102,241,.12); }
.escala-preview {
  margin-top: .75rem; padding: .6rem .8rem;
  background: var(--c-surface); border-radius: var(--radius-sm);
  font-size: .8rem; color: var(--c-text-3);
  border: 1px solid var(--c-border);
}

/* ═══════════════════════════════════════════════════════════
   CONSTRUCTOR VISUAL DE EJERCICIOS  v2.0
═══════════════════════════════════════════════════════════ */
.visual-builder {
  background: var(--c-bg); border: 1px solid var(--c-border);
  border-radius: var(--radius-lg); padding: 1.2rem;
}
.vb-tabs { display: flex; gap: 4px; margin-bottom: 1rem; background: var(--c-border); border-radius: var(--radius-md); padding: 3px; }
.vb-tab {
  flex: 1; padding: 6px 8px; border-radius: var(--radius-sm); text-align: center;
  font-size: .78rem; font-weight: 500; cursor: pointer; color: var(--c-text-3);
  transition: all var(--t-fast);
}
.vb-tab.active { background: var(--c-surface); color: var(--c-primary-700); box-shadow: var(--shadow-sm); }

.vb-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: .75rem; }
.vb-operand {
  display: flex; flex-direction: column; gap: 3px; align-items: center;
}
.vb-operand label { font-size: .68rem; font-weight: 600; color: var(--c-text-3); text-transform: uppercase; }
.vb-operand input {
  width: 72px; padding: 7px; border: 1.5px solid var(--c-border-2);
  border-radius: var(--radius-sm); font-size: .95rem; font-family: var(--font-mono);
  text-align: center; outline: none;
}
.vb-operand input:focus { border-color: var(--c-primary-500); }
.vb-op-sym {
  font-size: 1.4rem; color: var(--c-primary-600); font-weight: 700;
  margin-top: 14px; min-width: 20px; text-align: center;
}
.vb-frac {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
}
.vb-frac-line { width: 60px; height: 2px; background: var(--c-text); }

.vb-preview {
  min-height: 54px; display: flex; align-items: center; justify-content: center;
  background: var(--c-surface); border-radius: var(--radius-md); padding: .5rem 1rem;
  border: 1px solid var(--c-border); font-size: 1.4rem; margin-bottom: .75rem;
}

/* Previsualización de ejercicios generados */
.preview-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: .6rem; margin-top: .75rem; }
.preview-item {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-md); padding: .75rem 1rem;
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
}
.preview-item .katex-display { margin: 0; }
.preview-ans { font-family: var(--font-mono); font-size: .76rem; color: var(--c-text-3); }

/* Params accordion (parámetros por operación) */
.params-accordion { border: 1px solid var(--c-border); border-radius: var(--radius-md); overflow: hidden; }
.params-op-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: .7rem 1rem; background: var(--c-bg); cursor: pointer;
  font-size: .86rem; font-weight: 600; color: var(--c-text);
  transition: background var(--t-fast); border-bottom: 1px solid var(--c-border);
  user-select: none;
}
.params-op-header:last-child { border-bottom: none; }
.params-op-header:hover { background: var(--c-primary-50); }
.params-op-header.open { background: var(--c-primary-50); color: var(--c-primary-700); }
.params-op-chevron { transition: transform var(--t-base); font-size: .75rem; }
.params-op-header.open .params-op-chevron { transform: rotate(90deg); }
.params-op-body { padding: .85rem 1rem; border-bottom: 1px solid var(--c-border); display: none; }
.params-op-body.open { display: block; }

/* ═══════════════════════════════════════════════════════════
   CHART & HEATMAP
═══════════════════════════════════════════════════════════ */
.chart-wrap { position: relative; }
.chart-wrap canvas { max-height: 300px; }
.heatmap-legend { display: flex; align-items: center; gap: 8px; margin-top: .75rem; font-size: .75rem; color: var(--c-text-3); }
.heatmap-gradient { width: 120px; height: 10px; border-radius: var(--radius-full); background: linear-gradient(to right, #fca5a5, #fcd34d, #6ee7b7); flex-shrink: 0; }
.heatmap-outer { overflow: auto; }

/* Chips de habilidades */
.skill-chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.skill-chip { border-radius: var(--radius-md); padding: .6rem .9rem; min-width: 68px; text-align: center; }
.skill-chip .sc-pct   { font-size: 1.3rem; font-weight: 700; }
.skill-chip .sc-label { font-size: .68rem; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; margin-top: 1px; }

/* En riesgo */
.riesgo-list { display: flex; flex-direction: column; gap: .4rem; }
.riesgo-item {
  display: flex; align-items: center; gap: 8px; padding: .6rem .8rem;
  background: var(--c-danger-bg); border: 1px solid #fecaca; border-radius: var(--radius-md);
  font-size: .84rem; color: #991b1b;
}

/* ═══════════════════════════════════════════════════════════
   DIVIDER
═══════════════════════════════════════════════════════════ */
.divider { height: 1px; background: var(--c-border); margin: 1.25rem 0; }
.divider-label { display: flex; align-items: center; gap: .75rem; font-size: .78rem; color: var(--c-text-3); margin: 1rem 0; }
.divider-label::before, .divider-label::after { content: ''; flex: 1; height: 1px; background: var(--c-border); }

/* ═══════════════════════════════════════════════════════════
   UTILITIES
═══════════════════════════════════════════════════════════ */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start  { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center  { justify-content: center; }
.justify-end     { justify-content: flex-end; }
.gap-xs { gap: .25rem; }
.gap-sm { gap: .5rem; }
.gap-md { gap: 1rem; }
.gap-lg { gap: 1.5rem; }
.flex-1  { flex: 1 1 0; min-width: 0; }
.shrink-0 { flex-shrink: 0; }
.mt-sm { margin-top: .5rem; }
.mt-md { margin-top: 1rem; }
.mt-lg { margin-top: 1.5rem; }
.mb-sm { margin-bottom: .5rem; }
.mb-md { margin-bottom: 1rem; }
.mb-lg { margin-bottom: 1.5rem; }
.w-full   { width: 100%; }
.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-muted  { color: var(--c-text-3); }
.text-sm     { font-size: .82rem; }
.text-xs     { font-size: .72rem; }
.font-mono   { font-family: var(--font-mono); }
.font-bold   { font-weight: 700; }
.font-medium { font-weight: 500; }
.truncate    { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.uppercase   { text-transform: uppercase; letter-spacing: .06em; }
.cursor-pointer { cursor: pointer; }
.overflow-hidden { overflow: hidden; }

/* ═══════════════════════════════════════════════════════════
   ANIMATIONS
═══════════════════════════════════════════════════════════ */
@keyframes fadeIn  { from { opacity: 0; }                          to { opacity: 1; } }
@keyframes fadeUp  { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scaleIn { from { opacity: 0; transform: scale(.94); }    to { opacity: 1; transform: scale(1); } }

.anim-fade-up  { animation: fadeUp  .35s ease both; }
.anim-fade-in  { animation: fadeIn  .25s ease both; }
.anim-scale-in { animation: scaleIn .3s  ease both; }
.anim-d1 { animation-delay: .06s; }
.anim-d2 { animation-delay: .12s; }
.anim-d3 { animation-delay: .18s; }
.anim-d4 { animation-delay: .24s; }

/* ═══════════════════════════════════════════════════════════
   PRINT STYLES  v2.0
═══════════════════════════════════════════════════════════ */
@media print {
  /* Ocultar toda la UI de navegación */
  .sidebar, .main-header, #toast-container,
  .modal-overlay, .side-panel-overlay,
  .btn, .no-print { display: none !important; }

  /* Resetear layout */
  body { background: #fff !important; color: #000 !important; font-size: 11pt; }
  #app { display: block !important; }
  .main-col { height: auto !important; overflow: visible !important; }
  .main-body { padding: 0 !important; overflow: visible !important; }

  /* Hacer visible solo el panel activo */
  .panel { display: none !important; }
  .panel.print-active { display: block !important; }

  /* Encabezado de impresión */
  .print-header {
    display: flex !important;
    justify-content: space-between; align-items: center;
    border-bottom: 2px solid #1e1b4b; padding-bottom: .5rem; margin-bottom: 1rem;
  }
  .print-header .print-logo { font-family: Georgia, serif; font-size: 14pt; font-weight: bold; color: #1e1b4b; }
  .print-header .print-meta { font-size: 9pt; color: #666; text-align: right; }

  /* Cards y tablas */
  .card { box-shadow: none !important; border: 1px solid #ccc !important; break-inside: avoid; }
  .table-wrap { border: 1px solid #ccc !important; border-radius: 0 !important; }
  thead { background: #1e1b4b !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  thead th { color: #fff !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  tbody tr:hover td { background: transparent !important; }

  /* Charts: forzar visibilidad */
  canvas { max-height: 250px !important; }

  /* Métricas */
  .metrics-grid { grid-template-columns: repeat(4, 1fr) !important; }
  .metric-value { font-size: 1.4rem !important; }

  /* Ocultar elementos no relevantes en impresión */
  .empty-state, .loading-wrap, .heatmap-outer { display: none; }

  /* Saltos de página */
  .page-break { page-break-before: always; }
  .no-break   { break-inside: avoid; }
}

/* ═══════════════════════════════════════════════════════════
   SCROLLBAR
═══════════════════════════════════════════════════════════ */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--c-border-2); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-text-3); }
* { scrollbar-width: thin; scrollbar-color: var(--c-border-2) transparent; }

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .modal { padding: 1.25rem; }
  .side-panel { width: 100%; }
  .mode-tabs { flex-direction: column; }
}
@media (max-width: 480px) {
  .metrics-grid { grid-template-columns: 1fr; }
  .charts-grid  { grid-template-columns: 1fr; }
}