/* ============================================
   Folde OS — App-Specific Styles
   ============================================ */

/* ========================
   READER APP
   ======================== */
.reader-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--gray-7);
  background: var(--gray-9);
}

.reader-font-size {
  font-size: 12px;
  color: var(--gray-4);
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.reader-library {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.book-list-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--gray-8);
  cursor: pointer;
}

.book-list-item:hover {
  background: var(--gray-9);
}

.book-cover {
  width: 44px;
  height: 60px;
  border: 1.5px solid var(--gray-7);
  border-radius: 3px;
  background: var(--gray-8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.book-meta {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.book-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--black);
}

.book-author {
  font-size: 12px;
  color: var(--gray-5);
}

.book-progress-bar {
  height: 3px;
  background: var(--gray-8);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 4px;
}

.book-progress-fill {
  height: 100%;
  background: var(--black);
  border-radius: 2px;
}

.book-pct {
  font-size: 11px;
  color: var(--gray-5);
}

/* Reading view */
.reading-view {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.reading-view h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.reading-view .chapter-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gray-5);
  margin-bottom: 24px;
}

.reading-view p {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--gray-1);
  margin-bottom: 20px;
  text-align: justify;
  hyphens: auto;
}

.reading-nav {
  display: flex;
  justify-content: space-between;
  padding: 12px 24px;
  border-top: 1px solid var(--gray-7);
  position: sticky;
  bottom: 0;
  background: var(--white);
}


/* ========================
   NOTES APP
   ======================== */
.notes-layout {
  display: flex;
  height: 100%;
}

.notes-sidebar {
  width: 240px;
  border-right: 1.5px solid var(--gray-7);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.notes-sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--gray-7);
  display: flex;
  align-items: center;
  gap: 8px;
}

.notes-sidebar-header input {
  flex: 1;
  font-size: 13px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}

.notes-list {
  flex: 1;
  overflow-y: auto;
}

.note-list-item {
  padding: 12px 14px;
  border-bottom: 1px solid var(--gray-8);
  cursor: pointer;
}

.note-list-item:hover {
  background: var(--gray-9);
}

.note-list-item.active {
  background: var(--black);
  color: var(--white);
}

.note-list-item.active .note-list-date {
  color: var(--gray-6);
}

.note-list-title {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 3px;
}

.note-list-preview {
  font-size: 12px;
  color: var(--gray-4);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.note-list-item.active .note-list-preview {
  color: var(--gray-5);
}

.note-list-date {
  font-size: 11px;
  color: var(--gray-5);
  margin-top: 4px;
}

.notes-editor {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.notes-editor-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--gray-7);
  flex-wrap: wrap;
}

.tool-btn {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-7);
  font-size: 13px;
  cursor: pointer;
  background: var(--white);
  color: var(--gray-2);
}

.tool-btn:hover {
  background: var(--gray-9);
}

.tool-separator {
  width: 1px;
  height: 20px;
  background: var(--gray-7);
  margin: 0 4px;
}

#note-title-input {
  border: none;
  border-radius: 0;
  border-bottom: 1px solid var(--gray-8);
  padding: 14px 18px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--black);
}

#note-title-input:focus {
  border-color: var(--gray-5);
  outline: none;
}

#note-body-input {
  flex: 1;
  border: none;
  border-radius: 0;
  padding: 16px 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray-1);
  resize: none;
  font-family: var(--font-sans);
  overflow-y: auto;
}

#note-body-input:focus {
  outline: none;
}

.notes-status {
  padding: 6px 18px;
  font-size: 11px;
  color: var(--gray-5);
  border-top: 1px solid var(--gray-8);
  display: flex;
  justify-content: space-between;
}


/* ========================
   CALCULATOR APP
   ======================== */
.calc-wrapper {
  max-width: 320px;
  margin: 24px auto;
  display: flex;
  flex-direction: column;
  border: 1.5px solid var(--gray-7);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.calc-display {
  background: var(--black);
  color: var(--white);
  padding: 20px 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-end;
}

.calc-expression {
  font-size: 14px;
  color: var(--gray-5);
  min-height: 20px;
  font-family: var(--font-mono);
}

.calc-result {
  font-size: 42px;
  font-weight: 300;
  letter-spacing: -2px;
  font-family: var(--font-mono);
  line-height: 1;
  word-break: break-all;
}

.calc-keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--gray-7);
}

.calc-key {
  background: var(--white);
  border: none;
  padding: 0;
  height: 64px;
  font-size: 18px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  color: var(--black);
}

.calc-key:active {
  background: var(--gray-8);
}

.calc-key.op {
  background: var(--gray-9);
  color: var(--gray-2);
  font-size: 20px;
}

.calc-key.fn {
  background: var(--gray-8);
  font-size: 14px;
  color: var(--gray-3);
}

.calc-key.equals {
  background: var(--black);
  color: var(--white);
}

.calc-key.equals:active {
  background: var(--gray-2);
}

.calc-history {
  padding: 12px 16px;
  border-top: 1px solid var(--gray-7);
  max-height: 120px;
  overflow-y: auto;
}

.calc-hist-row {
  font-size: 12px;
  color: var(--gray-4);
  font-family: var(--font-mono);
  padding: 3px 0;
  text-align: right;
  border-bottom: 1px solid var(--gray-9);
}


/* ========================
   ASSIGNMENTS / TASKS APP
   ======================== */
.tasks-layout {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.tasks-header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--gray-7);
  display: flex;
  align-items: center;
  gap: 12px;
}

.tasks-header input {
  flex: 1;
  font-size: 14px;
}

.tasks-tabs {
  display: flex;
  border-bottom: 1.5px solid var(--gray-7);
}

.tasks-tab {
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-4);
  border-bottom: 2px solid transparent;
  margin-bottom: -1.5px;
}

.tasks-tab.active {
  color: var(--black);
  border-bottom-color: var(--black);
}

.tasks-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--gray-9);
  cursor: pointer;
}

.task-item:hover {
  background: var(--gray-9);
}

.task-check {
  width: 20px;
  height: 20px;
  border: 2px solid var(--gray-5);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 1px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  cursor: pointer;
}

.task-check.done {
  background: var(--black);
  border-color: var(--black);
  color: var(--white);
}

.task-body {
  flex: 1;
}

.task-name {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 3px;
}

.task-name.done {
  text-decoration: line-through;
  color: var(--gray-5);
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--gray-5);
}

.task-tag {
  padding: 2px 7px;
  border: 1px solid var(--gray-6);
  border-radius: 20px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.task-tag.math    { border-color: var(--gray-3); color: var(--gray-2); }
.task-tag.science { border-color: var(--gray-3); color: var(--gray-2); }
.task-tag.english { border-color: var(--gray-3); color: var(--gray-2); }

.task-due.overdue { color: var(--gray-2); font-weight: 600; }


/* ========================
   BROWSER / LEARN APP
   ======================== */
.browser-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--gray-7);
  background: var(--gray-9);
}

.browser-bar input {
  flex: 1;
  font-size: 13px;
  padding: 7px 12px;
  border-radius: 20px;
  border: 1.5px solid var(--gray-6);
}

.browser-content {
  padding: 24px;
  overflow-y: auto;
  height: 100%;
}

.learn-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.learn-card {
  border: 1.5px solid var(--gray-7);
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.learn-card:hover {
  background: var(--gray-9);
}

.learn-card-icon {
  font-size: 28px;
}

.learn-card-title {
  font-size: 14px;
  font-weight: 700;
}

.learn-card-sub {
  font-size: 12px;
  color: var(--gray-4);
}

.learn-section-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gray-5);
  font-weight: 600;
  margin-bottom: 12px;
}

.lesson-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--gray-8);
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-bottom: 8px;
}

.lesson-row:hover {
  background: var(--gray-9);
}

.lesson-icon {
  width: 36px;
  height: 36px;
  border: 1.5px solid var(--gray-7);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.lesson-meta {
  flex: 1;
}

.lesson-title {
  font-size: 13px;
  font-weight: 600;
}

.lesson-sub {
  font-size: 11px;
  color: var(--gray-5);
}

.lesson-badge {
  font-size: 11px;
  padding: 3px 8px;
  border: 1px solid var(--gray-6);
  border-radius: 20px;
  color: var(--gray-4);
}

.lesson-badge.new {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}


/* ========================
   SETTINGS APP
   ======================== */
.settings-layout {
  display: flex;
  height: 100%;
}

.settings-sidebar {
  width: 200px;
  border-right: 1.5px solid var(--gray-7);
  padding: 12px 0;
}

.settings-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  font-size: 13px;
  cursor: pointer;
  color: var(--gray-2);
}

.settings-nav-item:hover {
  background: var(--gray-9);
}

.settings-nav-item.active {
  background: var(--black);
  color: var(--white);
}

.settings-nav-icon {
  font-size: 16px;
}

.settings-content {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.settings-section {
  margin-bottom: 32px;
}

.settings-section-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--gray-7);
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-9);
}

.setting-row:last-child {
  border-bottom: none;
}

.setting-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.setting-name {
  font-size: 14px;
  font-weight: 500;
}

.setting-desc {
  font-size: 12px;
  color: var(--gray-5);
}

/* Toggle switch */
.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

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

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--gray-7);
  border-radius: 12px;
  cursor: pointer;
  border: 1.5px solid var(--gray-5);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--white);
  border: 1px solid var(--gray-5);
  top: 2px;
  left: 2px;
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--black);
  border-color: var(--black);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
  border-color: var(--gray-4);
}

.select-input {
  padding: 6px 10px;
  border: 1.5px solid var(--gray-6);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--black);
  cursor: pointer;
}


/* ========================
   SOLAR STATUS PANEL
   ======================== */
.solar-panel-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.solar-big-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px;
  border: 1.5px solid var(--gray-7);
  border-radius: var(--radius-lg);
}

.solar-big-pct {
  font-size: 64px;
  font-weight: 200;
  letter-spacing: -4px;
  line-height: 1;
}

.solar-big-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gray-5);
}

.solar-cells-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.solar-cell {
  height: 24px;
  border: 1.5px solid var(--gray-6);
  border-radius: 2px;
  background: var(--gray-8);
}

.solar-cell.active {
  background: var(--black);
  border-color: var(--black);
}

.solar-stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.solar-stat {
  border: 1px solid var(--gray-7);
  border-radius: var(--radius-md);
  padding: 14px;
}

.solar-stat-val {
  font-size: 22px;
  font-weight: 700;
  font-family: var(--font-mono);
}

.solar-stat-lbl {
  font-size: 11px;
  color: var(--gray-5);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 3px;
}