/* ==========================================================================
   LINUX LEARNING HUB – DEVELOPER DASHBOARD STYLESHEET
   Vanilla CSS3 - Zero Frameworks - High Performance - Dark Theme Default
   ========================================================================== */

:root {
  /* Dark Theme Palette (Default) */
  --bg-base: #090d16;
  --bg-sidebar: #0c1220;
  --bg-surface: #0f172a;
  --bg-card: #131d31;
  --bg-card-hover: #192640;
  --bg-card-subtle: #162035;
  --border-color: #223049;
  --border-subtle: #192438;
  --border-focus: #38bdf8;

  /* Typography Colors */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #090d16;

  /* Brand and Accent Colors */
  --accent-primary: #0284c7;
  --accent-light: #38bdf8;
  --accent-hover: #0369a1;
  --accent-bg: rgba(56, 189, 248, 0.1);
  --accent-glow: rgba(56, 189, 248, 0.2);

  /* Status Colors */
  --color-completed: #10b981;
  --color-completed-bg: rgba(16, 185, 129, 0.12);
  --color-inprogress: #0284c7;
  --color-inprogress-bg: rgba(2, 132, 199, 0.15);
  --color-notstarted: #64748b;
  --color-notstarted-bg: rgba(100, 116, 139, 0.12);

  /* Track Colors */
  --track-kernel: #38bdf8;
  --track-kernel-bg: rgba(56, 189, 248, 0.12);
  --track-app: #a855f7;
  --track-app-bg: rgba(168, 85, 247, 0.12);

  /* Feedback Colors */
  --color-danger: #ef4444;
  --color-danger-bg: rgba(239, 68, 68, 0.12);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.12);

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);

  /* Dimensions */
  --sidebar-width: 260px;
  --topbar-height: 64px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Typography Font Stack */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-base: #f4f6fa;
  --bg-sidebar: #ffffff;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-card-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-subtle: #cbd5e1;
  --border-focus: #0284c7;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --accent-primary: #0284c7;
  --accent-light: #0284c7;
  --accent-hover: #0369a1;
  --accent-bg: rgba(2, 132, 199, 0.08);

  --color-completed: #059669;
  --color-completed-bg: rgba(5, 150, 105, 0.1);
  --color-inprogress: #0284c7;
  --color-inprogress-bg: rgba(2, 132, 199, 0.1);
  --color-notstarted: #64748b;
  --color-notstarted-bg: rgba(100, 116, 139, 0.1);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* App Shell Layout */
.app-container {
  display: flex;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ==========================================================================
   SIDEBAR
   ========================================================================== */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 40;
  transition: transform 0.25s ease;
}

.sidebar-header {
  height: var(--topbar-height);
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-muted);
}

.sidebar-close-btn {
  display: none;
}

/* Learner Profile Badge in Sidebar */
.sidebar-badge {
  margin: 14px 16px 8px;
  padding: 10px 12px;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.badge-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.badge-dot.pulse {
  animation: pulse-green 2s infinite ease-in-out;
}

@keyframes pulse-green {
  0%, 100% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.2); opacity: 1; }
}

.badge-target {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-light);
}

.badge-details {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Nav Menu */
.sidebar-nav {
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: background-color 0.15s ease, color 0.15s ease;
  position: relative;
}

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

.nav-item.active {
  background-color: var(--accent-bg);
  color: var(--accent-light);
  font-weight: 600;
}

.nav-item.active .nav-icon {
  stroke: var(--accent-light);
}

.nav-label {
  flex: 1;
}

.nav-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 10px;
  background-color: var(--bg-card-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.nav-item.active .nav-badge {
  background-color: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mini-progress-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mini-progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 12px;
  transition: all 0.15s ease;
}

.theme-toggle-btn:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

/* ==========================================================================
   MAIN WRAPPER & TOPBAR
   ========================================================================== */
.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  height: var(--topbar-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 30;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.view-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

.view-desc {
  font-size: 12px;
  color: var(--text-muted);
}

.mobile-menu-btn {
  display: none;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.quick-stat-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 12px;
}

.stat-pill-label {
  color: var(--text-muted);
}

.stat-pill-val {
  color: var(--accent-light);
  font-weight: 600;
}

/* ==========================================================================
   CONTENT CONTAINER & VIEWS
   ========================================================================== */
.content-container {
  padding: 24px 28px 48px;
  flex: 1;
  max-width: 1440px;
  width: 100%;
}

.view-panel {
  display: none;
}

.view-panel.active {
  display: block;
}

/* ==========================================================================
   CARDS & GRIDS
   ========================================================================== */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.2px;
}

.card-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.stat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
}

.stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.stat-label {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-muted);
}

.stat-icon-wrap {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-cyan { background-color: var(--accent-bg); color: var(--accent-light); }
.icon-emerald { background-color: var(--color-completed-bg); color: var(--color-completed); }
.icon-indigo { background-color: rgba(99, 102, 241, 0.12); color: #818cf8; }
.icon-purple { background-color: var(--track-app-bg); color: var(--track-app); }

.stat-main {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.stat-value {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.stat-sub {
  font-size: 12px;
  color: var(--text-muted);
}

.stat-footer-text {
  font-size: 11.5px;
  color: var(--text-secondary);
  margin-top: 10px;
}

/* Status count badges inside stat card */
.topic-status-counts {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
}

.status-count-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-bottom: 2px;
}

.status-dot.completed { background-color: var(--color-completed); }
.status-dot.in-progress { background-color: var(--accent-light); }
.status-dot.not-started { background-color: var(--color-notstarted); }

.count-num {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.count-label {
  font-size: 11px;
  color: var(--text-muted);
}

/* Dashboard Two Columns Row */
.dash-row-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 1024px) {
  .dash-row-grid {
    grid-template-columns: 1fr;
  }
}

/* Current Learning Card */
.card-current-learning {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-left: 4px solid var(--accent-light);
}

.summary-text {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 10px 0 16px;
}

.meta-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 11.5px;
  color: var(--text-secondary);
}

.meta-pill svg {
  color: var(--accent-light);
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

/* Study Stats & Chart Card */
.card-study-stats {
  display: flex;
  flex-direction: column;
}

.week-goal-badge {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--accent-light);
  background-color: var(--accent-bg);
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.weekly-chart-wrapper {
  min-height: 180px;
  display: flex;
  align-items: flex-end;
  gap: 12px;
  padding: 16px 8px 8px;
}

.chart-bar-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  height: 160px;
  justify-content: flex-end;
}

.chart-bar-val {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-muted);
}

.chart-bar-pillar {
  width: 100%;
  max-width: 32px;
  background-color: var(--bg-card-subtle);
  border-radius: 4px 4px 0 0;
  min-height: 6px;
  transition: height 0.3s ease, background-color 0.2s ease;
  position: relative;
}

.chart-bar-pillar.has-study {
  background: linear-gradient(180deg, var(--accent-light), var(--accent-primary));
}

.chart-bar-pillar.today-bar {
  border: 1px solid var(--accent-light);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.3);
}

.chart-bar-day {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}

.chart-bar-day.is-today {
  color: var(--accent-light);
  font-weight: 700;
}

.chart-summary-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
}

.chart-stat-item .label {
  color: var(--text-muted);
  margin-right: 4px;
}

.chart-stat-item .val {
  color: var(--text-primary);
}

/* Section Blocks */
.section-block {
  margin-top: 24px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.section-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.2px;
}

.section-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Next Topics Grid */
.next-topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}

.next-topic-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.next-topic-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
}

.next-topic-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.next-topic-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.next-topic-meta {
  font-size: 11.5px;
  color: var(--text-muted);
}

/* Phases Overview Grid (Dashboard 22 Phases) */
.phases-overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.phase-overview-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.phase-overview-card:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--border-focus);
}

.phase-ov-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.phase-ov-code {
  font-size: 11.5px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-light);
}

.phase-ov-name {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.35;
}

.phase-ov-footer {
  margin-top: 10px;
}

.phase-ov-stats {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

/* ==========================================================================
   ROADMAP VIEW & ACCORDIONS
   ========================================================================== */
.toolbar-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  margin-bottom: 20px;
}

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

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1;
  min-width: 260px;
}

.search-box svg {
  position: absolute;
  left: 12px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: 9px 36px 9px 38px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s ease;
}

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

.clear-search-btn {
  position: absolute;
  right: 10px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  display: none;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toolbar-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filter-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  padding: 5px 11px;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.chip:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

.chip.active {
  background-color: var(--accent-bg);
  border-color: var(--accent-light);
  color: var(--accent-light);
  font-weight: 600;
}

/* Roadmap Accordion */
.roadmap-accordion-container {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.track-group-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0 6px;
}

.track-group-title {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-light);
}

.track-group-title.advanced {
  color: var(--track-app);
}

.track-group-line {
  flex: 1;
  height: 1px;
  background-color: var(--border-color);
}

/* Phase Accordion Card */
.phase-accordion-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.phase-accordion-card.open {
  border-color: var(--border-subtle);
}

.phase-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  user-select: none;
  background-color: var(--bg-card);
  transition: background-color 0.15s ease;
}

.phase-header:hover {
  background-color: var(--bg-card-hover);
}

.phase-header-left {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
}

.phase-chevron {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.phase-accordion-card.open .phase-chevron {
  transform: rotate(90deg);
  color: var(--accent-light);
}

.phase-title-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.phase-code-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.phase-code-text {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--accent-light);
}

.phase-title-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.phase-header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.phase-progress-summary {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  width: 140px;
}

.phase-progress-labels {
  display: flex;
  justify-content: space-between;
  width: 100%;
  font-size: 11px;
  color: var(--text-muted);
}

/* Phase Body & Topics Grid */
.phase-body {
  display: none;
  padding: 0 20px 20px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-base);
}

.phase-accordion-card.open .phase-body {
  display: block;
}

.phase-goal-note {
  font-size: 12.5px;
  color: var(--text-secondary);
  padding: 12px 14px;
  margin: 14px 0;
  background-color: var(--bg-card-subtle);
  border-left: 3px solid var(--accent-light);
  border-radius: var(--radius-sm);
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}

/* Topic Card */
.topic-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  position: relative;
}

.topic-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.topic-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.topic-id-tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  background-color: var(--bg-card-subtle);
  color: var(--accent-light);
  border: 1px solid var(--border-color);
}

.topic-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  margin-top: 4px;
}

.topic-card-summary {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topic-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
}

.topic-card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border-subtle);
}

.topic-status-select {
  padding: 4px 8px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
}

.topic-status-select:focus {
  border-color: var(--border-focus);
}

/* ==========================================================================
   VIDEO COURSES VIEW
   ========================================================================== */
.video-header-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  background: linear-gradient(135deg, var(--bg-card), var(--bg-card-subtle));
}

.video-header-info {
  flex: 1;
  min-width: 280px;
}

.video-stats-summary {
  display: flex;
  gap: 14px;
}

.video-stat-box {
  padding: 10px 16px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  text-align: center;
}

.video-stat-box .label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
}

.video-stat-box .val {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
}

.video-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  transition: border-color 0.15s ease;
}

.video-card:hover {
  border-color: var(--border-focus);
}

.video-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.video-stt-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 4px;
  background-color: var(--track-app-bg);
  color: var(--track-app);
}

.video-duration-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-secondary);
}

.video-title {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
}

.video-full-title {
  font-size: 11.5px;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 2px;
}

.video-topics-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.video-url-section {
  display: flex;
  gap: 8px;
}

.video-url-input {
  flex: 1;
  padding: 6px 10px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--text-primary);
}

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

.video-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   STUDY HISTORY VIEW
   ========================================================================== */
.history-filters-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.form-group-inline {
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-group-inline label {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}

.data-table th {
  padding: 12px 16px;
  background-color: var(--bg-card-subtle);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.data-table tbody tr:hover td {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

.data-table td strong {
  color: var(--text-primary);
}

.table-responsive {
  overflow-x: auto;
}

.empty-state {
  padding: 48px 24px;
  text-align: center;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

/* ==========================================================================
   SETTINGS VIEW
   ========================================================================== */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}

.settings-grid .span-full {
  grid-column: 1 / -1;
}

.profile-info-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.profile-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.profile-item .p-label {
  font-size: 11.5px;
  color: var(--text-muted);
}

.profile-item .p-val {
  font-size: 13.5px;
  color: var(--text-primary);
}

.data-mgmt-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.mgmt-action-card {
  padding: 18px;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.mgmt-action-card h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.mgmt-action-card p {
  font-size: 12px;
  color: var(--text-muted);
  flex: 1;
}

.mgmt-action-card.danger-card {
  border-color: rgba(239, 68, 68, 0.3);
  background-color: rgba(239, 68, 68, 0.05);
}

/* ==========================================================================
   FORM CONTROLS & BUTTONS
   ========================================================================== */
.form-group {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-control {
  width: 100%;
  padding: 9px 12px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s ease;
}

.form-control:focus {
  border-color: var(--border-focus);
}

.form-hint {
  font-size: 11px;
  color: var(--text-muted);
}

.select-sm, .input-sm {
  padding: 6px 10px;
  font-size: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-sm {
  padding: 5px 12px;
  font-size: 12px;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background-color: var(--color-completed);
  color: #fff;
  border-color: var(--color-completed);
}

.btn-secondary:hover {
  background-color: #059669;
}

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

.btn-outline:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.btn-danger {
  background-color: var(--color-danger);
  color: #fff;
}

.btn-danger:hover {
  background-color: #dc2626;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}

.badge-cyan { background-color: var(--track-kernel-bg); color: var(--track-kernel); }
.badge-purple { background-color: var(--track-app-bg); color: var(--track-app); }
.badge-accent { background-color: var(--accent-bg); color: var(--accent-light); }
.badge-completed { background-color: var(--color-completed-bg); color: var(--color-completed); }
.badge-inprogress { background-color: var(--color-inprogress-bg); color: var(--color-inprogress); }
.badge-notstarted { background-color: var(--color-notstarted-bg); color: var(--color-notstarted); }
.badge-outline { border: 1px solid var(--border-color); color: var(--text-muted); }

/* Progress Bars */
.progress-bar-track {
  width: 100%;
  height: 6px;
  background-color: var(--bg-card-subtle);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #0284c7, #38bdf8);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.progress-bar-fill.bg-cyan { background: linear-gradient(90deg, #0284c7, #38bdf8); }
.progress-bar-fill.bg-emerald { background: linear-gradient(90deg, #059669, #10b981); }
.progress-bar-fill.bg-purple { background: linear-gradient(90deg, #7c3aed, #a855f7); }

/* ==========================================================================
   MODALS & DRAWERS
   ========================================================================= */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(9, 13, 22, 0.88);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: translateY(12px);
  transition: transform 0.2s ease;
  overflow: hidden;
}

.modal-overlay.active .modal-container {
  transform: translateY(0);
}

.modal-lg { max-width: 760px; }
.modal-sm { max-width: 440px; }

.modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.modal-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 4px;
}

.modal-meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-topic-id {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  background-color: var(--bg-card-subtle);
}

.modal-close-btn {
  font-size: 22px;
  line-height: 1;
}

/* Topic Detail Modal Styles */
.status-edit-card {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.status-edit-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.status-btn-group {
  display: flex;
  gap: 6px;
}

.btn-status-toggle {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.btn-status-toggle.active[data-status="not-started"] {
  background-color: var(--color-notstarted-bg);
  border-color: var(--color-notstarted);
  color: var(--text-primary);
  font-weight: 600;
}

.btn-status-toggle.active[data-status="in-progress"] {
  background-color: var(--color-inprogress-bg);
  border-color: var(--accent-light);
  color: var(--accent-light);
  font-weight: 600;
}

.btn-status-toggle.active[data-status="completed"] {
  background-color: var(--color-completed-bg);
  border-color: var(--color-completed);
  color: var(--color-completed);
  font-weight: 600;
}

.date-inputs-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.topic-summary-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.detail-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.topic-objectives-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topic-objectives-list li {
  position: relative;
  padding-left: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.45;
}

.topic-objectives-list li::before {
  content: "•";
  position: absolute;
  left: 6px;
  color: var(--accent-light);
  font-weight: bold;
}

.topic-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.detail-mini-box {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.detail-mini-box .label {
  font-size: 11px;
  color: var(--text-muted);
}

.detail-mini-box .val {
  font-size: 12.5px;
  color: var(--text-primary);
}

.section-title-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.note-auto-save-text {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
}

.quick-duration-chips {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.quick-dur-chip {
  padding: 3px 8px;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 11.5px;
  color: var(--text-secondary);
  cursor: pointer;
}

.quick-dur-chip:hover {
  background-color: var(--accent-bg);
  border-color: var(--accent-light);
  color: var(--accent-light);
}

/* ==========================================================================
   TOAST NOTIFICATIONS
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-light);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 260px;
  transform: translateX(100%);
  opacity: 0;
  animation: toast-in 0.3s forwards ease;
}

.toast.toast-success { border-left-color: var(--color-completed); }
.toast.toast-error { border-left-color: var(--color-danger); }
.toast.toast-warning { border-left-color: var(--color-warning); }

@keyframes toast-in {
  to { transform: translateX(0); opacity: 1; }
}

@keyframes toast-out {
  to { transform: translateX(100%); opacity: 0; }
}

/* Helper Utilities */
.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-14 { margin-top: 14px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.text-right { text-align: right; }
.font-semibold { font-weight: 600; }
.text-cyan { color: var(--accent-light); }
.text-purple { color: var(--track-app); }
.text-danger { color: var(--color-danger); }
.text-secondary { color: var(--text-secondary); }

/* ==========================================================================
   GLOBAL STUDY TIMER & POMODORO STYLES
   ========================================================================== */

/* Topbar Global Timer Widget */
.global-timer-widget {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
  user-select: none;
}

.global-timer-widget.active {
  border-color: var(--accent-light);
  background-color: var(--bg-card);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.global-timer-widget.paused {
  border-color: var(--color-warning);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.2);
}

.global-timer-widget.break-mode {
  border-color: var(--color-completed);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.2);
}

.timer-pulse-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--accent-light);
  box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.7);
  animation: pulse-timer 1.8s infinite;
}

.global-timer-widget.paused .timer-pulse-dot {
  background-color: var(--color-warning);
  animation: none;
}

.global-timer-widget.break-mode .timer-pulse-dot {
  background-color: var(--color-completed);
  animation: pulse-green 1.8s infinite ease-in-out;
}

@keyframes pulse-timer {
  0%, 100% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.2); opacity: 1; }
}

.timer-info-col {
  display: flex;
  flex-direction: column;
  cursor: pointer;
  max-width: 170px;
}

.timer-topic-title {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.timer-status-badge {
  font-size: 10px;
  color: var(--accent-light);
  font-weight: 500;
}

.global-timer-widget.paused .timer-status-badge {
  color: var(--color-warning);
}

.global-timer-widget.break-mode .timer-status-badge {
  color: var(--color-completed);
}

.timer-digits {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
}

.timer-digits:hover {
  background-color: var(--bg-card-hover);
  color: var(--accent-light);
}

.timer-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.timer-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Topic Card Quick Start Button */
.btn-start-topic {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 11.5px;
  font-weight: 600;
  background-color: var(--accent-bg);
  border: 1px solid var(--accent-light);
  color: var(--accent-light);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-start-topic:hover {
  background-color: var(--accent-primary);
  color: #fff;
}

.btn-start-topic.is-current {
  background-color: var(--color-completed-bg);
  border-color: var(--color-completed);
  color: var(--color-completed);
}

/* Today's Summary Card */
.today-summary-card {
  border-left: 4px solid var(--color-completed);
}

.today-stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 12px;
}

.today-stat-item {
  display: flex;
  flex-direction: column;
}

.today-stat-item .label {
  font-size: 11.5px;
  color: var(--text-muted);
}

.today-stat-item .val {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.today-topics-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 140px;
  overflow-y: auto;
}

.today-topic-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 12px;
}

.today-topic-item .t-name {
  color: var(--text-primary);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
}

.today-topic-item .t-dur {
  font-family: var(--font-mono);
  color: var(--accent-light);
  font-weight: 600;
}

/* ==========================================================================
   FOCUS MODE MODAL
   ========================================================================== */
.focus-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(6, 10, 18, 0.97);
  z-index: 250;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.focus-modal-overlay.active {
  display: flex;
}

.focus-modal-container {
  width: 100%;
  max-width: 680px;
  background: linear-gradient(180deg, #131d31 0%, #0c1220 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px 32px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  position: relative;
  overflow: hidden;
}

.focus-modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  font-size: 24px;
  color: var(--text-muted);
}

.focus-topic-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.focus-topic-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  line-height: 1.35;
  margin-bottom: 8px;
  max-width: 580px;
}

.focus-pomodoro-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.pomodoro-cycles-row {
  display: flex;
  gap: 6px;
  margin-left: 6px;
}

.pomodoro-cycle-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  background-color: transparent;
}

.pomodoro-cycle-dot.completed {
  background-color: #ef4444;
  border-color: #ef4444;
  box-shadow: 0 0 6px rgba(239, 68, 68, 0.5);
}

.pomodoro-cycle-dot.active {
  border-color: var(--accent-light);
  animation: pulse-timer 1.5s infinite;
}

/* Big Glowing Digital Clock */
.focus-timer-clock {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 2px;
  line-height: 1;
  margin: 16px 0 28px;
  text-shadow: 0 0 30px rgba(56, 189, 248, 0.25);
  user-select: none;
}

.focus-timer-clock.break-time {
  color: var(--color-completed);
  text-shadow: 0 0 30px rgba(16, 185, 129, 0.3);
}

.focus-timer-clock.paused {
  color: var(--color-warning);
  text-shadow: 0 0 30px rgba(245, 158, 11, 0.25);
}

.focus-timer-progress-wrap {
  width: 100%;
  max-width: 440px;
  margin-bottom: 32px;
}

.focus-actions-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.focus-btn-lg {
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-lg);
}

/* Pomodoro Setting Toggles */
.settings-toggle-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.toggle-label-wrap {
  display: flex;
  flex-direction: column;
}

.toggle-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
}

.toggle-desc {
  font-size: 11px;
  color: var(--text-muted);
}

.switch {
  position: relative;
  display: inline-block;
  width: 42px;
  height: 24px;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  transition: .2s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-muted);
  transition: .2s;
  border-radius: 50%;
}

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

input:checked + .slider:before {
  transform: translateX(18px);
  background-color: #ffffff;
}

.undo-toast-btn {
  background-color: var(--accent-light);
  color: #090d16;
  border: none;
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  margin-left: 8px;
}

.undo-toast-btn:hover {
  background-color: #fff;
}

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .sidebar-close-btn {
    display: flex;
  }

  .main-wrapper {
    margin-left: 0;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .topbar {
    padding: 0 16px;
  }

  .content-container {
    padding: 16px 16px 40px;
  }

  .topic-detail-grid {
    grid-template-columns: 1fr;
  }
}