/* Subject Preparation Matrix, Dedicated View & Activity Logs Styling */

/* Dedicated Subject Detail Topbar */
.subject-detail-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  gap: 16px;
  flex-wrap: wrap;
}

.back-to-subjects-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card-bg);
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 10px 18px;
  border-radius: 99px;
  font: 600 13.5px 'DM Sans', sans-serif;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.back-to-subjects-btn:hover {
  background: var(--purple-soft);
  color: var(--purple);
  border-color: var(--purple);
  transform: translateX(-3px);
}

.subject-switcher-select {
  background: var(--card-bg);
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 9px 16px;
  border-radius: 99px;
  font: 600 13px 'DM Sans', sans-serif;
  cursor: pointer;
  box-shadow: var(--shadow);
  outline: none;
  transition: border-color 0.2s ease;
}

.subject-switcher-select:focus {
  border-color: var(--purple);
}

/* Matrix Card & Sticky Table */
.matrix-card {
  background: var(--card-bg);
  border-radius: 20px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 35px;
  transition: all 0.25s ease;
}

.matrix-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 30px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--card-bg), var(--paper));
}

.matrix-card-title-group {
  display: flex;
  align-items: center;
  gap: 16px;
}

.matrix-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 24px;
  border: 1px solid var(--line);
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.matrix-header-eyebrow-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 3px;
}

.matrix-tag {
  font-size: 9.5px;
  letter-spacing: 1.4px;
  font-weight: 700;
  color: var(--eyebrow);
}

.matrix-subject-code {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--purple-soft);
  color: var(--purple);
}

.matrix-subject-title {
  font: 700 23px 'Playfair Display', serif;
  margin: 0 0 3px;
  color: var(--ink);
}

.matrix-subject-meta {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}

.matrix-progress-widget {
  min-width: 240px;
}

.matrix-progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.progress-kicker {
  font-size: 10px;
  letter-spacing: 1.5px;
  font-weight: 700;
  color: var(--eyebrow);
}

.progress-value {
  font-size: 14px;
  font-weight: 800;
  color: var(--purple);
}

.matrix-progress-bar-track {
  height: 7px;
  border-radius: 99px;
  background: var(--line);
  overflow: hidden;
}

.matrix-progress-bar-fill {
  height: 100%;
  border-radius: 99px;
  transition: width 0.4s ease;
}

/* Matrix Table & Ultra-Smooth Hardware-Accelerated Horizontal Scroll */
.matrix-table-wrap {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding: 0 0 10px;
  position: relative;
  border-radius: 12px;
  will-change: scroll-position;
  transform: translateZ(0);
  contain: layout paint;
  overscroll-behavior-x: contain;
  touch-action: pan-x pan-y;
}

.matrix-table-wrap::-webkit-scrollbar {
  height: 6px;
}

.matrix-table-wrap::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 99px;
}

.matrix-table-wrap::-webkit-scrollbar-thumb:hover {
  background: var(--purple-soft);
}

.matrix-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  min-width: 900px;
  transform: translateZ(0);
}

.matrix-table thead tr th {
  padding: 16px 14px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  color: var(--eyebrow);
  text-align: center;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
  vertical-align: middle;
  background: var(--card-bg);
}

/* Sticky Chapter Header & Cells with Solid Background */
.th-chapter {
  min-width: 210px;
  padding-left: 24px !important;
  text-align: left !important;
  position: sticky !important;
  left: 0;
  background: var(--card-bg) !important;
  z-index: 12 !important;
  border-right: 2px solid var(--line);
}

.td-chapter {
  min-width: 210px;
  padding-left: 24px !important;
  position: sticky !important;
  left: 0;
  background: var(--card-bg) !important;
  z-index: 10 !important;
  border-right: 2px solid var(--line);
}

.th-progress {
  min-width: 120px;
  text-align: left !important;
  padding-left: 18px !important;
}

.td-progress {
  min-width: 120px;
  padding-left: 18px !important;
}

.th-task {
  min-width: 140px;
}

.th-task-content {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.col-menu-btn {
  border: 0;
  background: transparent;
  color: var(--subtle);
  font-size: 15px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
  padding: 0 4px;
  line-height: 1;
}

.th-task:hover .col-menu-btn {
  opacity: 1;
}

.col-menu-btn:hover {
  color: #ef4444;
}

.th-add-col {
  padding-right: 28px !important;
  text-align: right !important;
}

.add-column-btn {
  border: 0;
  background: var(--purple);
  color: #fff;
  padding: 8px 16px;
  border-radius: 99px;
  font: 600 12px 'DM Sans', sans-serif;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(101, 88, 182, 0.25);
  transition: all 0.2s ease;
}

.add-column-btn:hover {
  background: var(--purple-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(101, 88, 182, 0.35);
}

/* Rows & Cells */
.matrix-row {
  transition: background 0.15s ease;
}

.matrix-row:hover td {
  background: var(--purple-soft) !important;
}

.matrix-row td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
  background: var(--card-bg);
}

.chapter-cell {
  display: grid;
  gap: 2px;
}

.chapter-bn {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
}

.chapter-en {
  font-size: 11.5px;
  color: var(--muted);
}

.progress-cell {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mini-prog-track {
  flex: 1;
  height: 6px;
  border-radius: 99px;
  background: var(--line);
  overflow: hidden;
  max-width: 60px;
}

.mini-prog-fill {
  height: 100%;
  border-radius: 99px;
  transition: width 0.3s ease;
}

.prog-pct {
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  min-width: 28px;
}

.td-cell {
  text-align: center;
  padding: 8px 10px !important;
}

/* Matrix Pill Button */
.matrix-pill-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-width: 90px;
  max-width: 140px;
  height: 42px;
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  margin: 0 auto;
  border: 1.5px solid transparent;
}

/* 1. Todo State */
.matrix-pill-btn.state-todo {
  border: 1.5px dashed var(--line);
  background: transparent;
}

.matrix-pill-btn.state-todo:hover {
  border-color: var(--purple);
  background: var(--purple-soft);
  transform: scale(1.03);
}

.pill-badge.pill-todo {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  color: var(--subtle);
  opacity: 0.5;
}

.pill-badge.pill-todo .badge-icon {
  font-size: 16px;
  line-height: 1;
}

/* 2. Doing State (In Progress) */
.matrix-pill-btn.state-doing {
  background: rgba(245, 158, 11, 0.12);
  border: 1.5px solid #f59e0b;
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.2);
}

.matrix-pill-btn.state-doing:hover {
  background: rgba(245, 158, 11, 0.2);
  transform: scale(1.03);
}

.pill-badge.pill-doing {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1.5px solid #f59e0b;
  color: #f59e0b;
}

.pill-badge.pill-doing .badge-icon {
  font-size: 13px;
  line-height: 1;
}

/* 3. Done State (Completed) */
.matrix-pill-btn.state-done {
  background: rgba(16, 185, 129, 0.14);
  border: 1.5px solid #10b981;
  box-shadow: 0 0 14px rgba(16, 185, 129, 0.25);
}

.matrix-pill-btn.state-done:hover {
  background: rgba(16, 185, 129, 0.22);
  transform: scale(1.03);
}

.pill-badge.pill-done {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1.5px solid #10b981;
  color: #10b981;
}

.pill-badge.pill-done .badge-icon {
  font-size: 14px;
  font-weight: 900;
  line-height: 1;
}

/* Subject Detail Analytics Section */
.subject-detail-analytics {
  margin-top: 40px;
}

/* ============================================================
   Activity Logs View Styling
   ============================================================ */
.logs-page {
  display: grid;
  gap: 25px;
}

.logs-header-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card-bg);
  padding: 24px 28px;
  border-radius: 20px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  flex-wrap: wrap;
  gap: 16px;
}

.logs-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.log-filter-tabs {
  display: flex;
  gap: 8px;
  background: var(--card-bg);
  padding: 5px;
  border-radius: 99px;
  border: 1px solid var(--line);
}

.log-filter-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 600 12.5px 'DM Sans', sans-serif;
  padding: 7px 16px;
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.log-filter-btn.active {
  background: var(--purple);
  color: #fff;
  box-shadow: 0 2px 8px rgba(101, 88, 182, 0.3);
}

.log-search-wrap {
  position: relative;
  min-width: 260px;
}

.log-search-input {
  width: 100%;
  padding: 10px 16px;
  border-radius: 99px;
  border: 1px solid var(--line);
  background: var(--card-bg);
  color: var(--ink);
  font: 500 13px 'DM Sans', sans-serif;
  outline: none;
  transition: border-color 0.2s ease;
}

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

.clear-logs-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font: 600 12px 'DM Sans', sans-serif;
  padding: 8px 14px;
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.clear-logs-btn:hover {
  color: #ef4444;
  border-color: #ef4444;
}

.activity-log-list {
  display: grid;
  gap: 12px;
}

.log-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--card-bg);
  padding: 16px 20px;
  border-radius: 14px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.log-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-hover);
}

.log-icon-badge {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--purple-soft);
  display: grid;
  place-items: center;
  font-size: 18px;
  flex-shrink: 0;
}

.log-content {
  flex: 1;
  display: grid;
  gap: 3px;
}

.log-header-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.log-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
}

.log-time {
  font-size: 11.5px;
  color: var(--subtle);
  font-weight: 500;
}

.log-detail {
  font-size: 12.5px;
  color: var(--muted);
  margin: 0;
}

.log-tag {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--tag-bg);
  color: var(--purple);
  width: fit-content;
  margin-top: 4px;
}

.empty-log-state {
  text-align: center;
  padding: 60px 20px;
  background: var(--card-bg);
  border-radius: 16px;
  border: 1px solid var(--line);
}

.empty-log-icon {
  font-size: 42px;
  margin-bottom: 12px;
  display: block;
}

.empty-log-state h3 {
  font-size: 18px;
  color: var(--ink);
  margin: 0 0 6px;
}

.empty-log-state p {
  font-size: 13.5px;
  color: var(--muted);
  margin: 0;
}

/* ============================================================
   Transitions & Animations
   ============================================================ */
[data-page] {
  animation: pageFadeIn 0.28s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes pageFadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-hidden {
  display: none !important;
}

.subject {
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.2s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.2s ease;
}

.subject:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--purple);
}

.modal-backdrop {
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.date-modal, .profile-modal {
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.28s ease;
}