/* ============================================================
   HOJA DE RESPUESTAS – CSS
   Colegio Epullay Montessori
   ============================================================ */

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:        #1e40af;
  --primary-light:  #3b82f6;
  --primary-bg:     #eff6ff;
  --success:        #16a34a;
  --success-light:  #dcfce7;
  --danger:         #dc2626;
  --danger-light:   #fee2e2;
  --warning:        #d97706;
  --warning-light:  #fef3c7;
  --neutral:        #64748b;
  --neutral-light:  #f1f5f9;
  --border:         #e2e8f0;
  --text:           #0f172a;
  --text-muted:     #64748b;
  --card:           #ffffff;
  --shadow:         0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:      0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -2px rgba(0,0,0,.1);
  --radius:         10px;
  --radius-sm:      6px;
  --font:           'Inter', system-ui, sans-serif;
}

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--neutral-light);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ---------- Header ---------- */
.app-header {
  background: var(--primary);
  color: #fff;
  padding: 0 1.5rem;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.brand-icon { font-size: 1.8rem; }

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.2;
}

.brand-text span {
  font-size: .78rem;
  opacity: .8;
}

.header-chips {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

/* ---------- Chips ---------- */
.chip {
  padding: .25rem .75rem;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 600;
  white-space: nowrap;
}

.chip-neutral  { background: rgba(255,255,255,.15); color: #fff; }
.chip-success  { background: var(--success);        color: #fff; }
.chip-primary  { background: var(--primary-light);  color: #fff; }
.chip-warning  { background: var(--warning);         color: #fff; }
.chip-danger   { background: var(--danger);          color: #fff; }

/* ---------- Tab nav ---------- */
.tab-nav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  padding: 0 1.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  position: sticky;
  top: 64px;
  z-index: 90;
  box-shadow: var(--shadow);
}

.tab-btn {
  padding: 1rem 1.25rem;
  border: none;
  background: none;
  font-family: var(--font);
  font-size: .88rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  display: flex;
  align-items: center;
  gap: .4rem;
  transition: color .15s, border-color .15s;
}

.tab-btn:hover { color: var(--primary); }
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

/* ---------- Main content ---------- */
.app-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ---------- Section header ---------- */
.section-header {
  margin-bottom: 1.5rem;
}

.section-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: .25rem;
}

.section-header p {
  color: var(--text-muted);
  font-size: .9rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .5rem 1rem;
  border-radius: var(--radius-sm);
  border: none;
  font-family: var(--font);
  font-size: .88rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity .15s, transform .1s;
  white-space: nowrap;
}

.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn-primary   { background: var(--primary);       color: #fff; }
.btn-primary:hover:not(:disabled) { background: #1d4ed8; }
.btn-secondary { background: var(--neutral-light); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover:not(:disabled) { background: var(--border); }
.btn-success   { background: var(--success);       color: #fff; }
.btn-success:hover:not(:disabled) { background: #15803d; }
.btn-danger    { background: var(--danger);        color: #fff; }
.btn-danger:hover:not(:disabled) { background: #b91c1c; }

.btn-sm { padding: .35rem .75rem; font-size: .8rem; }
.btn-lg { padding: .7rem 1.5rem; font-size: 1rem; font-weight: 600; }

/* ---------- Upload zone ---------- */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--card);
  padding: 3rem 2rem;
  text-align: center;
  transition: border-color .2s, background .2s;
  cursor: pointer;
  margin-bottom: 1.5rem;
}

.upload-zone.drag-over,
.upload-zone:hover {
  border-color: var(--primary-light);
  background: var(--primary-bg);
}

.upload-zone-inner { pointer-events: none; }

.upload-icon { font-size: 3rem; margin-bottom: .75rem; }

.upload-headline {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: .25rem;
}

.upload-sub {
  color: var(--text-muted);
  font-size: .85rem;
  margin-bottom: 1rem;
}

/* ---------- File list ---------- */
.file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: .5rem;
}

.file-list-header > span {
  font-weight: 600;
  color: var(--text-muted);
  font-size: .9rem;
}

.file-list-actions { display: flex; gap: .5rem; }

.progress-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .875rem 1rem;
  margin-bottom: 1rem;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: .82rem;
  font-weight: 500;
  margin-bottom: .5rem;
  color: var(--text-muted);
}

.progress-bar-bg {
  height: 8px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary-light);
  border-radius: 999px;
  transition: width .3s ease;
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  max-height: 400px;
  overflow-y: auto;
  margin-bottom: 1.25rem;
}

.file-card {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .75rem 1rem;
  transition: border-color .15s;
}

.file-card.status-processing { border-left: 3px solid var(--primary-light); }
.file-card.status-success    { border-left: 3px solid var(--success); }
.file-card.status-error      { border-left: 3px solid var(--danger); }
.file-card.status-pending    { border-left: 3px solid var(--border); }

.file-icon { font-size: 1.5rem; flex-shrink: 0; }

.file-info { flex: 1; min-width: 0; }

.file-name {
  font-size: .88rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-meta {
  font-size: .78rem;
  color: var(--text-muted);
}

.file-status { display: flex; align-items: center; gap: .4rem; font-size: .78rem; }

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .2rem .55rem;
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 600;
}

.badge-pending    { background: var(--neutral-light); color: var(--neutral); }
.badge-processing { background: var(--primary-bg);    color: var(--primary); }
.badge-success    { background: var(--success-light);  color: var(--success); }
.badge-error      { background: var(--danger-light);   color: var(--danger); }

.file-result-preview {
  font-size: .78rem;
  margin-top: .3rem;
  color: var(--text-muted);
}

.file-error-msg {
  font-size: .78rem;
  margin-top: .3rem;
  color: var(--danger);
}

.file-actions-col { display: flex; flex-direction: column; gap: .25rem; align-items: flex-end; }

.btn-icon-sm {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: var(--neutral-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  transition: background .15s;
}

.btn-icon-sm:hover { background: var(--border); }

.file-cta { display: flex; justify-content: center; padding: .5rem 0; }

/* ---------- Answer Key ---------- */
.subject-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1rem;
}

.subject-tab-btn {
  padding: .4rem .9rem;
  border-radius: 999px;
  border: 1.5px solid var(--border);
  background: var(--card);
  font-family: var(--font);
  font-size: .82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
  color: var(--text-muted);
}

.subject-tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.subject-tab-btn:hover:not(.active) {
  border-color: var(--primary-light);
  color: var(--primary);
}

.key-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: .5rem;
}

.key-progress-label {
  font-size: .88rem;
  font-weight: 600;
  color: var(--text-muted);
}

.key-actions { display: flex; gap: .5rem; flex-wrap: wrap; }

.answer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .4rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

@media (max-width: 900px) {
  .answer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .answer-grid { grid-template-columns: 1fr; }
}

.question-row {
  display: flex;
  align-items: center;
  gap: .3rem;
}

.q-num {
  font-size: .75rem;
  font-weight: 600;
  color: var(--text-muted);
  width: 22px;
  text-align: right;
  flex-shrink: 0;
}

.ans-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: transparent;
  font-family: var(--font);
  font-size: .75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .12s;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.ans-btn:hover { border-color: var(--primary-light); color: var(--primary); background: var(--primary-bg); }

.ans-btn.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ---------- Results ---------- */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state p { font-size: .95rem; }

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.summary-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow);
}

.summary-card-label {
  font-size: .78rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: .25rem;
}

.summary-card-value {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
}

.value-success { color: var(--success); }
.value-danger  { color: var(--danger); }
.value-primary { color: var(--primary); }
.value-warning { color: var(--warning); }

.results-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .875rem 1rem;
}

.filter-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.filter-label {
  display: flex;
  flex-direction: column;
  font-size: .78rem;
  font-weight: 600;
  color: var(--text-muted);
  gap: .25rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.filter-select {
  font-family: var(--font);
  font-size: .88rem;
  padding: .35rem .6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}

.filter-select:focus { outline: 2px solid var(--primary-light); }

.toolbar-actions { display: flex; gap: .5rem; align-items: center; }

.table-scroll-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .82rem;
  background: var(--card);
  min-width: 900px;
}

.results-table th {
  background: var(--primary);
  color: #fff;
  padding: .6rem .75rem;
  text-align: left;
  font-weight: 600;
  font-size: .75rem;
  white-space: nowrap;
  position: sticky;
  top: 0;
}

.results-table th.sortable { cursor: pointer; user-select: none; }
.results-table th.sortable:hover { background: #1d4ed8; }

.results-table td {
  padding: .45rem .75rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.results-table tbody tr:hover { background: var(--primary-bg); }

.results-table tbody tr:last-child td { border-bottom: none; }

/* Answer cells */
.ans-cell {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: .72rem;
  font-weight: 700;
}

.ans-correct  { background: var(--success);       color: #fff; }
.ans-wrong    { background: var(--danger);         color: #fff; }
.ans-blank    { background: var(--neutral-light);  color: var(--text-muted); font-size: .6rem; }
.ans-nokey    { background: var(--primary-bg);     color: var(--primary); }

/* Nota colors */
.nota-excellent { color: #166534; font-weight: 700; }
.nota-good      { color: var(--success); font-weight: 600; }
.nota-pass      { color: var(--primary); font-weight: 600; }
.nota-fail      { color: var(--danger);  font-weight: 700; }

/* ---------- Charts ---------- */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

@media (max-width: 900px) {
  .charts-grid { grid-template-columns: 1fr; }
}

.chart-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.chart-card-wide { grid-column: 1 / -1; }

.chart-card h3 {
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text);
}

.chart-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: .5rem;
}

.chart-card-header h3 { margin-bottom: 0; }

.filter-label-inline {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .82rem;
  font-weight: 500;
  color: var(--text-muted);
}

.filter-select-sm {
  font-family: var(--font);
  font-size: .82rem;
  padding: .25rem .5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
}

.chart-wrap {
  position: relative;
  height: 280px;
}

.chart-wrap-tall {
  height: 380px;
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal {
  background: var(--card);
  border-radius: var(--radius);
  width: 100%;
  max-width: 520px;
  box-shadow: 0 20px 60px rgba(0,0,0,.25);
  overflow: hidden;
}

.modal-header {
  background: var(--primary);
  color: #fff;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 { font-size: 1rem; font-weight: 700; }

.modal-close {
  background: none;
  border: none;
  color: rgba(255,255,255,.8);
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover { color: #fff; }

.modal-body { padding: 1.25rem; }

.modal-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .875rem;
}

@media (max-width: 480px) {
  .modal-form-grid { grid-template-columns: 1fr; }
}

.form-label {
  display: flex;
  flex-direction: column;
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-muted);
  gap: .3rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.form-input {
  font-family: var(--font);
  font-size: .9rem;
  padding: .45rem .65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  background: var(--card);
  font-weight: 400;
}

.form-input:focus {
  outline: 2px solid var(--primary-light);
  border-color: var(--primary-light);
}

.modal-note {
  margin-top: .875rem;
  font-size: .78rem;
  color: var(--text-muted);
  font-style: italic;
}

.modal-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: .5rem;
}

/* ---------- Spinner ---------- */
@keyframes spin { to { transform: rotate(360deg); } }

.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: middle;
}

.spinner-dark {
  border: 2px solid rgba(0,0,0,.1);
  border-top-color: var(--primary);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: #cbd5e1; }

/* ---------- Utilities ---------- */
.hidden { display: none !important; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger  { color: var(--danger); }