/* ==========================================================================
   GRADEFLOW — GEIST / VERCEL MINIMALIST DESIGN SYSTEM
   Aesthetics: Strict Grayscale, Subtle Borders, Tabular Numbers, Generous Space
   ========================================================================== */

:root,
[data-theme="light"] {
  /* Light Theme Default (Minimalista Blanco) */
  --bg-page: #ffffff;
  --bg-sidebar: #fbfbfb;
  --bg-card: #ffffff;
  --bg-card-hover: #f9f9f9;
  --bg-subtle: #f4f4f5;
  --bg-input: #f9f9fa;

  --border-subtle: #e5e7eb;
  --border-strong: #d1d5db;
  --border-focus: #9ca3af;

  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;

  --accent-button-bg: #111827;
  --accent-button-text: #ffffff;

  --status-pass-text: #15803d;
  --status-pass-bg: rgba(21, 128, 61, 0.08);
  --status-pass-border: rgba(21, 128, 61, 0.2);

  --status-fail-text: #b91c1c;
  --status-fail-bg: rgba(185, 28, 28, 0.08);
  --status-fail-border: rgba(185, 28, 28, 0.2);

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --trans-fast: 0.15s ease;
  --trans-normal: 0.2s ease;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color var(--trans-normal), color var(--trans-normal);
}

.font-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.hidden {
  display: none !important;
}

.text-success { color: var(--status-pass-text) !important; }
.text-danger { color: var(--status-fail-text) !important; }
.text-muted { color: var(--text-tertiary) !important; }

/* ==========================================================================
   Application Master Layout (Sidebar + Main)
   ========================================================================== */
.app-layout {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* ==========================================================================
   Sidebar: Multi-Group Navigation
   ========================================================================== */
.sidebar {
  width: 270px;
  flex-shrink: 0;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 30;
  transition: all var(--trans-normal);
}

.sidebar-header {
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.brand-logo {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-name {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-xs);
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.sidebar-section {
  flex: 1;
  padding: 1rem 0.75rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.sidebar-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.25rem 0.6rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
}

.sidebar-header-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.btn-clear-header {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.15rem 0.4rem;
  font-size: 0.68rem;
  font-family: inherit;
  font-weight: 500;
  color: var(--text-tertiary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--trans-fast);
}

.btn-clear-header:hover {
  color: var(--status-fail-text);
  background-color: var(--status-fail-bg);
  border-color: var(--status-fail-border);
}

.badge-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.groups-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-group-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.5rem 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.825rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--trans-fast);
  user-select: none;
  gap: 0.4rem;
}

.nav-group-item:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
}

.nav-group-item.active {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--border-subtle);
  font-weight: 600;
}

.nav-group-item-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  min-width: 0;
  gap: 0.4rem;
}

.btn-group-item-delete {
  display: none;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  padding: 0;
  border-radius: var(--radius-xs);
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--trans-fast);
  flex-shrink: 0;
}

.nav-group-item:hover .btn-group-item-delete {
  display: inline-flex;
}

.btn-group-item-delete:hover {
  background-color: var(--status-fail-bg);
  color: var(--status-fail-text);
}

.group-item-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 155px;
}

.group-item-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.sidebar-actions {
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  border-top: 1px solid var(--border-subtle);
}

.sidebar-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.storage-indicator {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--status-pass-text);
}

/* ==========================================================================
   Buttons & Minimalist Interactive Controls
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--trans-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--accent-button-bg);
  color: var(--accent-button-text);
  border-color: transparent;
  font-weight: 600;
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--border-strong);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
}

.btn-ghost-danger {
  background-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost-danger:hover {
  background-color: var(--status-fail-bg);
  color: var(--status-fail-text);
  border-color: var(--status-fail-border);
}

.btn-full {
  width: 100%;
}

.btn:disabled,
button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.775rem;
}

.btn-icon-subtle {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.35rem;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--trans-fast);
}

.btn-icon-subtle:hover {
  color: var(--text-primary);
}



/* Geist Toggle Switch */
.switch-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.775rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 32px;
  height: 18px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  transition: 0.2s;
  border-radius: var(--radius-pill);
}

.slider:before {
  position: absolute;
  content: "";
  height: 12px;
  width: 12px;
  left: 2px;
  bottom: 2px;
  background-color: var(--text-secondary);
  transition: 0.2s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--text-primary);
  border-color: var(--text-primary);
}

input:checked + .slider:before {
  transform: translateX(14px);
  background-color: var(--text-inverse);
}

/* ==========================================================================
   Main Container Area
   ========================================================================== */
.main-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background-color: var(--bg-page);
}

/* Top Navigation Bar */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: var(--bg-page);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1.15rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  backdrop-filter: blur(12px);
}

.group-title-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.group-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-primary);
}

.active-group-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.active-group-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.top-nav-controls {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.setting-toggle-box {
  display: flex;
  align-items: center;
}

.passing-grade-input-box {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.775rem;
  color: var(--text-secondary);
}

.input-compact {
  width: 54px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.775rem;
  padding: 0.25rem 0.4rem;
  text-align: center;
  outline: none;
}

.input-compact:focus {
  border-color: var(--border-focus);
}

.top-nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ==========================================================================
   Empty State View
   ========================================================================== */
.empty-state-view {
  padding: 4rem 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty-drop-card {
  position: relative;
  max-width: 580px;
  width: 100%;
  background-color: var(--bg-card);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--trans-normal);
}

.empty-drop-card:hover, .empty-drop-card.dragover {
  border-color: var(--text-secondary);
  background-color: var(--bg-card-hover);
}

.hidden-file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 5;
}

.empty-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  color: var(--text-primary);
}

.empty-drop-card h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.empty-drop-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.empty-cta-buttons {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.empty-hints {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.725rem;
  color: var(--text-tertiary);
}

/* ==========================================================================
   Group Workspace (Metrics, Toolbar, Table)
   ========================================================================== */
.group-workspace {
  padding: 1.75rem 2rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Metrics Grid (Geist KPI Cards) */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(185px, 1fr));
  gap: 1rem;
}

.metric-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--trans-fast);
}

.metric-card:hover {
  border-color: var(--border-strong);
}

.metric-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.metric-title {
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.metric-badge {
  font-size: 0.675rem;
  font-family: var(--font-mono);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
}

.metric-badge.badge-success {
  background-color: var(--status-pass-bg);
  color: var(--status-pass-text);
  border-color: var(--status-pass-border);
}

.metric-badge.badge-danger {
  background-color: var(--status-fail-bg);
  color: var(--status-fail-text);
  border-color: var(--status-fail-border);
}

.metric-tag {
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

.metric-body {
  margin: 0.2rem 0;
}

.metric-number {
  font-size: 1.85rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
}

.pass-split-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.metric-footer {
  font-size: 0.725rem;
  color: var(--text-tertiary);
  margin-top: 0.6rem;
}

.metric-progress-track {
  width: 100%;
  height: 4px;
  background-color: var(--bg-subtle);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.metric-progress-fill {
  height: 100%;
  background-color: var(--text-primary);
  border-radius: var(--radius-pill);
  transition: width 0.4s ease;
}

.metric-subtext {
  margin-top: 0.35rem;
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

/* ==========================================================================
   Toolbar Section
   ========================================================================== */
.toolbar-section {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
}

.search-input-wrapper {
  position: relative;
  width: 280px;
}

.search-input-wrapper svg {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-input-wrapper input {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.8125rem;
  padding: 0.45rem 2rem 0.45rem 2.1rem;
  outline: none;
  transition: border-color var(--trans-fast);
}

.search-input-wrapper input:focus {
  border-color: var(--border-focus);
}

.search-kbd {
  position: absolute;
  right: 0.65rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-tertiary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-xs);
  pointer-events: none;
}

.sort-controls-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.toolbar-caption {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-right: 0.2rem;
}

.btn-pill {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--trans-fast);
}

.btn-pill:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
}

.btn-pill.active {
  background-color: var(--text-primary);
  color: var(--text-inverse);
  border-color: var(--text-primary);
  font-weight: 500;
}

.filter-tabs-group {
  display: flex;
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.15rem;
}

.filter-tab {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.75rem;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--trans-fast);
}

.filter-tab:hover {
  color: var(--text-primary);
}

.filter-tab.active {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  font-weight: 500;
}

.rounding-controls-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* ==========================================================================
   Grades Table (Sticky Columns & Responsive Scroll)
   ========================================================================== */
.table-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.table-scroll-wrapper {
  overflow-x: auto;
  max-width: 100%;
}

.grades-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.8125rem;
  text-align: left;
}

/* Row 1: Dates */
.header-dates-row th {
  background-color: var(--bg-card);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.675rem;
  font-weight: 400;
  padding: 0.45rem 0.65rem;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

/* Row 2: Task Titles */
.header-tasks-row th {
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.775rem;
  font-weight: 600;
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.header-tasks-row th.sortable {
  cursor: pointer;
  user-select: none;
}

.header-tasks-row th.sortable:hover {
  background-color: var(--bg-subtle);
}

.sort-indicator {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  margin-left: 0.3rem;
}

/* Task Header Containers & Inline Edit */
.task-header-th {
  min-width: 105px;
  position: relative;
}

.task-date-container, .task-name-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  position: relative;
}

.task-date-text {
  cursor: pointer;
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-xs);
  transition: all var(--trans-fast);
  color: var(--text-secondary);
}

.task-date-text:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  text-decoration: underline dotted;
}

.task-name-text {
  cursor: pointer;
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-xs);
  transition: all var(--trans-fast);
  max-width: 130px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: inline-block;
}

.task-name-text:hover {
  background-color: var(--bg-subtle);
  text-decoration: underline dotted;
}

.task-header-input {
  width: 100%;
  max-width: 120px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-focus);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.75rem;
  padding: 0.2rem 0.35rem;
  text-align: center;
  outline: none;
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.05);
}

.task-header-input:focus {
  border-color: var(--text-primary);
}

.btn-delete-task {
  opacity: 0;
  visibility: hidden;
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 0.15rem;
  border-radius: var(--radius-xs);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--trans-fast);
}

.task-name-th:hover .btn-delete-task {
  opacity: 1;
  visibility: visible;
}

.btn-delete-task:hover {
  color: var(--color-danger);
  background-color: rgba(239, 68, 68, 0.12);
}

/* Add Task Column in Header */
.col-add-task-th {
  text-align: center;
  vertical-align: middle;
  padding: 0.35rem 0.5rem;
  width: 90px;
  min-width: 90px;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-card);
}

.btn-add-task-col {
  background-color: var(--bg-subtle);
  border: 1px dashed var(--border-strong);
  color: var(--text-secondary);
  font-size: 0.725rem;
  font-weight: 500;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-xs);
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: all var(--trans-fast);
}

.btn-add-task-col:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
  background-color: var(--bg-card-hover);
}

.col-add-task-empty {
  border-bottom: 1px solid var(--border-subtle);
  width: 90px;
  min-width: 90px;
}

/* Row 3: Class Task Average Summary */
.header-summary-row th {
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  font-size: 0.725rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border-bottom: 1px solid var(--border-strong);
  white-space: nowrap;
}

/* Pinned Columns for Easy Horizontal Reading */
.col-pinned {
  position: sticky;
  left: 0;
  z-index: 10;
  background-color: inherit;
}

.col-idx {
  width: 36px;
  text-align: center;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.725rem;
  left: 0;
}

.col-student {
  left: 36px;
  min-width: 240px;
  max-width: 320px;
  border-right: 1px solid var(--border-subtle);
}

.col-pinned-right {
  position: sticky;
  right: 0;
  z-index: 10;
  background-color: inherit;
}

.col-avg {
  right: 110px;
  width: 96px;
  text-align: center;
  border-left: 1px solid var(--border-subtle);
}

.avg-header-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
}

.avg-header-top {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.badge-avg-mode {
  display: inline-block;
  font-size: 0.575rem;
  font-weight: 600;
  padding: 0.08rem 0.35rem;
  border-radius: var(--radius-xs);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.1;
  pointer-events: none;
}

.col-status {
  right: 0;
  width: 110px;
  text-align: center;
}

/* Table Body Rows */
.grades-table tbody tr {
  background-color: var(--bg-card);
  transition: background-color var(--trans-fast);
}

.grades-table tbody tr:hover {
  background-color: var(--bg-card-hover);
}

.grades-table tbody td {
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
  white-space: nowrap;
}

.student-row-name {
  font-weight: 500;
  color: var(--text-primary);
}

.grade-cell {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-primary);
  min-width: 80px;
  padding: 0.35rem 0.4rem !important;
  position: relative;
}

.grade-cell-input {
  width: 100%;
  max-width: 70px;
  margin: 0 auto;
  display: block;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-xs);
  padding: 0.25rem 0.2rem;
  outline: none;
  cursor: pointer;
  transition: all var(--trans-fast);
}

.grade-cell-input:hover {
  background-color: var(--bg-subtle);
  border-color: var(--border-subtle);
}

.grade-cell-input:focus {
  background-color: var(--bg-card);
  border-color: var(--text-primary);
  box-shadow: 0 0 0 1px var(--text-primary);
  cursor: text;
}

.grade-cell-input.grade-zero {
  color: var(--text-tertiary);
  font-weight: 400;
}

.grade-cell-input.grade-unsubmitted {
  color: var(--text-tertiary);
  font-style: italic;
  font-weight: 400;
}

.grade-cell-input.just-updated {
  animation: cellFlash 0.7s ease;
}

@keyframes cellFlash {
  0% {
    background-color: rgba(16, 185, 129, 0.25);
    border-color: #10b981;
  }
  100% {
    background-color: transparent;
    border-color: transparent;
  }
}

.student-avg-cell {
  text-align: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.45rem 0.5rem !important;
}

.avg-cell-val {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.15;
}

.avg-cell-sub {
  font-size: 0.65rem;
  color: var(--text-tertiary);
  font-weight: 400;
  margin-top: 0.15rem;
  line-height: 1;
}

/* Minimalist Status Badges */
.badge-status {
  display: inline-block;
  font-size: 0.675rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-xs);
  border: 1px solid transparent;
}

.badge-status-pass {
  background-color: var(--status-pass-bg);
  color: var(--status-pass-text);
  border-color: var(--status-pass-border);
}

.badge-status-fail {
  background-color: var(--status-fail-bg);
  color: var(--status-fail-text);
  border-color: var(--status-fail-border);
}

.table-search-empty {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* ==========================================================================
   Upload Modal Dialog
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  overflow-y: auto;
}

.modal-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  max-height: calc(100vh - 2.5rem);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  margin: auto;
}

.modal-head {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.btn-close-modal {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 0.9rem;
}

.btn-close-modal:hover {
  color: var(--text-primary);
}

.modal-content {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.modal-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.modal-field label {
  font-size: 0.775rem;
  color: var(--text-secondary);
}

.input-text {
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.8125rem;
  padding: 0.5rem 0.75rem;
  outline: none;
}

.input-text:focus {
  border-color: var(--border-focus);
}

.field-hint {
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

.modal-drop-zone {
  position: relative;
  background-color: var(--bg-subtle);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 2rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  transition: all var(--trans-fast);
}

.modal-drop-zone:hover, .modal-drop-zone.dragover {
  border-color: var(--text-secondary);
  background-color: var(--bg-card-hover);
}

.modal-drop-zone svg {
  color: var(--text-secondary);
}

.modal-drop-zone p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.modal-foot {
  padding: 0.85rem 1.25rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
  background-color: var(--bg-subtle);
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */
.toast-stack {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 120;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  color: var(--text-primary);
  font-size: 0.8125rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

/* ==========================================================================
   Word Report (Docx Modal & Controls)
   ========================================================================== */
.btn-docx-trigger {
  border-color: #2b579a;
  color: #2b579a;
  background-color: rgba(43, 87, 154, 0.04);
  transition: all var(--trans-fast);
}

.btn-docx-trigger:hover {
  background-color: #2b579a;
  color: #ffffff;
  border-color: #2b579a;
}

.modal-box-wide {
  max-width: 640px;
  width: 100%;
  max-height: min(88vh, 700px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.45);
}

.modal-box-wide .modal-head {
  flex-shrink: 0;
  padding: 0.9rem 1.25rem;
}

.modal-box-wide .modal-content {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 1.15rem 1.25rem;
  gap: 0.95rem;
}

.modal-box-wide .modal-foot {
  flex-shrink: 0;
  padding: 0.85rem 1.25rem;
}

/* Custom sleek scrollbar for modal content */
.modal-box-wide .modal-content::-webkit-scrollbar {
  width: 6px;
}

.modal-box-wide .modal-content::-webkit-scrollbar-track {
  background: var(--bg-subtle);
  border-radius: 9999px;
  margin: 4px 0;
}

.modal-box-wide .modal-content::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 9999px;
}

.modal-box-wide .modal-content::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

.modal-subtitle {
  font-size: 0.775rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
  font-weight: 400;
}

.docx-group-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.docx-banner-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.docx-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.docx-group-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
}

.docx-group-meta {
  font-size: 0.725rem;
  color: var(--text-secondary);
  display: block;
}

.docx-pill-format {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: #1e40af;
  background-color: #dbeafe;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
}

.field-label-bold {
  font-weight: 600 !important;
  color: var(--text-primary) !important;
}

.column-pill-selector {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.column-pill {
  position: relative;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.65rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
  cursor: pointer;
  transition: all var(--trans-fast);
  user-select: none;
}

.column-pill input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.pill-radio-dot {
  width: 16px;
  height: 16px;
  min-width: 16px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  background-color: var(--bg-card);
  transition: all var(--trans-fast);
  display: inline-block;
  box-sizing: border-box;
}

.column-pill:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-card-hover);
}

.column-pill.active {
  border-color: #2563eb;
  background-color: rgba(37, 99, 235, 0.04);
  box-shadow: 0 0 0 1px #2563eb;
}

.column-pill.active .pill-radio-dot {
  border-color: #2563eb;
  background-color: #2563eb;
  box-shadow: inset 0 0 0 3px #ffffff;
}

.pill-content {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.pill-title {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}

.pill-desc {
  font-size: 0.675rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.column-pill.active .pill-title {
  color: #1d4ed8;
}

.docx-section-card {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  background-color: var(--bg-card);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.docx-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.5rem;
}

.docx-section-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-auto-calc {
  font-size: 0.675rem;
  font-weight: 600;
  color: #15803d;
  background-color: rgba(21, 128, 61, 0.09);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
}

.modal-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.input-with-badge {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-badge .input-text {
  width: 100%;
  padding-right: 5rem;
}

.input-highlight {
  font-weight: 600;
  font-size: 0.9rem !important;
  color: #111827 !important;
  background-color: #fbfbfb !important;
}

.field-tag-badge {
  position: absolute;
  right: 0.5rem;
  font-size: 0.675rem;
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--bg-subtle);
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-xs);
  pointer-events: none;
}

.docx-details-section {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.85rem;
  background-color: var(--bg-subtle);
}

.docx-details-summary {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

.docx-details-summary::-webkit-details-marker {
  display: none;
}

.summary-arrow {
  transition: transform var(--trans-fast);
}

.docx-details-section[open] .summary-arrow {
  transform: rotate(180deg);
}

.docx-details-body {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   Multi-Period (Parcial 1, 2, 3 & Concentrado Semestral) Bar & Views
   ========================================================================== */
.periods-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.55rem 0.85rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

.periods-tabs {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  background-color: var(--bg-subtle);
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.periods-tab-divider {
  width: 1px;
  height: 20px;
  background-color: var(--border-strong);
  margin: 0 0.2rem;
}

.period-tab {
  appearance: none;
  -webkit-appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-xs);
  border: 1px solid transparent;
  background-color: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  transition: all var(--trans-fast);
  user-select: none;
  white-space: nowrap;
}

.period-tab:hover {
  background-color: rgba(255, 255, 255, 0.65);
  color: var(--text-primary);
}

.period-tab.active {
  background-color: var(--text-primary);
  color: var(--text-inverse);
  border-color: var(--text-primary);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.period-tab-summary.active {
  background-color: #1e3a8a;
  border-color: #1e3a8a;
  color: #ffffff;
}

.period-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--border-strong);
  flex-shrink: 0;
  transition: background-color var(--trans-fast);
}

.period-status-dot.loaded {
  background-color: #16a34a;
}

.period-tab.active .period-status-dot.loaded {
  background-color: #4ade80;
}

.period-tab-badge {
  font-size: 0.675rem;
  font-weight: 600;
  padding: 0.12rem 0.42rem;
  border-radius: var(--radius-pill);
  background-color: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  line-height: 1.1;
}

.period-tab.active .period-tab-badge {
  background-color: rgba(255, 255, 255, 0.18);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.28);
}

.period-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.period-source-info {
  display: inline-flex;
  align-items: center;
  font-size: 0.725rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  padding: 0.28rem 0.6rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Empty Period View */
.empty-period-view {
  padding: 1.5rem 0;
  display: flex;
  justify-content: center;
}

.empty-period-card {
  position: relative;
  max-width: 560px;
  width: 100%;
  background-color: var(--bg-card);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: all var(--trans-normal);
}

.empty-period-card:hover,
.empty-period-card.dragover {
  border-color: var(--text-secondary);
  background-color: var(--bg-card-hover);
}

.empty-period-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

.empty-period-card p {
  font-size: 0.825rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.35rem;
}

.empty-period-card .empty-cta-buttons {
  position: relative;
  z-index: 10;
  margin-bottom: 0;
}

/* Upload Modal Period Selector */
.upload-period-selector {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.upload-period-pill {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  padding: 0.55rem 0.5rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: var(--bg-card);
  cursor: pointer;
  transition: all var(--trans-fast);
  user-select: none;
  text-align: center;
}

.upload-period-pill input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.upload-period-pill:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-subtle);
}

.upload-period-pill.active {
  border-color: var(--text-primary);
  background-color: var(--text-primary);
  color: var(--text-inverse);
}

.upload-pill-title {
  font-size: 0.8rem;
  font-weight: 600;
}

.upload-pill-status {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  color: var(--text-tertiary);
}

.upload-period-pill.active .upload-pill-status {
  color: rgba(255, 255, 255, 0.75);
}

/* Docx Modal Source Select */
.docx-source-selector-wrap {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.docx-source-label {
  font-size: 0.725rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.input-compact-select {
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  outline: none;
  cursor: pointer;
}

/* Concentrado Semestral Table Styles */
.semestral-period-th {
  text-align: center !important;
  min-width: 120px;
}

.semestral-period-cell {
  text-align: center;
  font-family: var(--font-mono);
  min-width: 120px;
}

.semestral-period-empty {
  color: var(--text-tertiary);
  font-style: italic;
  font-size: 0.75rem;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 900px) {
  .app-layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .top-nav {
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem;
  }

  .top-nav-controls {
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .group-workspace {
    padding: 1.25rem;
  }
}