/* ============================================================
   Tasks — IBM Carbon Design System Theme (Gray 100 Dark)
   ============================================================ */

/* IBM Plex Sans — IBM's official typeface */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap');

/* ==================== CSS Variables ==================== */
:root {
  /* ---- Carbon Gray 100 Dark Theme Tokens ---- */

  /* Background layers (Carbon: $background → $layer-01 → $layer-02 → $layer-03) */
--bg-primary:     #0d0d0d;   /* near-black background */
--bg-secondary:   #161616;   /* subtle elevation */
--bg-tertiary:    #1f1f1f;   /* higher layer */
--bg-card:        #161616;
--bg-card-hover:  #202020;
--bg-glass:       rgba(255, 255, 255, 0.03);
--bg-glass-hover: rgba(255, 255, 255, 0.06);
--bg-input:       #141414;
--bg-input-focus: #1a1a1a;

  /* Borders (Carbon: $border-subtle, $border-strong, $focus) */
  --border-color:       #393939;  /* border-subtle-01 */
  --border-color-hover: #525252;  /* border-strong-01 */
  --border-color-focus: #0f62fe;  /* focus */

  /* Text tokens */
  --text-primary:   #f4f4f4;  /* text-primary */
  --text-secondary: #c6c6c6;  /* text-secondary */
  --text-tertiary:  #8d8d8d;  /* text-placeholder */
  --text-inverse:   #161616;  /* text-inverse */

  /* Carbon Blue accent (Interactive / $interactive) */
  --accent:          #0f62fe;  /* interactive */
  --accent-hover:    #0353e9;  /* interactive-hover (Blue 70) */
  --accent-glow:     rgba(15, 98, 254, 0.16);
  --accent-gradient: linear-gradient(135deg, #0f62fe 0%, #0043ce 100%);

  /* Priority / Severity — Carbon uses semantic alert colors */
  --priority-urgent:    #fa4d56;   /* $support-error */
  --priority-urgent-bg: rgba(250, 77, 86, 0.10);
  --priority-high:      #f1c21b;   /* $support-warning */
  --priority-high-bg:   rgba(241, 194, 27, 0.10);
  --priority-normal:    #0f62fe;

  /* Status */
  --success:    #42be65;  /* $support-success */
  --success-bg: rgba(66, 190, 101, 0.10);
  --warning:    #f1c21b;  /* $support-warning */
  --danger:     #fa4d56;  /* $support-error */
  --danger-bg:  rgba(250, 77, 86, 0.10);

  /* Carbon 8px base unit spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;

  /* Carbon uses SHARP corners (0 or 2px max) — no rounded pills */
  --radius-sm:   0px;
  --radius-md:   0px;
  --radius-lg:   0px;
  --radius-xl:   0px;
  --radius-full: 0px;   /* Carbon uses square chips, not pill-shaped */

  /* Shadows: Carbon uses very subtle, directional drop shadows */
  --shadow-sm:  0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md:  0 2px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg:  0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-glow:0 0 0 3px var(--accent-glow);

  /* Transitions: Carbon keeps motion purposeful and fast */
  --transition-fast:   70ms  cubic-bezier(0.2, 0, 0.38, 0.9);
  --transition-normal: 150ms cubic-bezier(0.2, 0, 0.38, 0.9);
  --transition-slow:   240ms cubic-bezier(0.2, 0, 0.38, 0.9);

  /* Layout */
  --sidebar-width:      256px;   /* Carbon standard side-nav width */
  --header-height:      48px;    /* Carbon shell header height */
  --max-content-width:  900px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 400;
  font-size: 0.875rem;       /* Carbon body-short-01: 14px */
  line-height: 1.428571429;  /* Carbon: 20px / 14px */
  letter-spacing: 0.16px;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Carbon uses no ambient decorative backgrounds — just flat surfaces */
body::before { display: none; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
  color: inherit;
  letter-spacing: 0.16px;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  outline: none;
  border: none;
  background: none;
  letter-spacing: 0.16px;
}

/* Scrollbar — thin, Carbon-style */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: #525252; }
::-webkit-scrollbar-thumb:hover { background: #6f6f6f; }

/* ==================== Animations ==================== */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-16px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.98); }
  to   { opacity: 1; transform: scale(1); }
}

/* Carbon checkbox uses a simple fill, no bounce */
@keyframes checkBounce {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.1); }
  100% { transform: scale(1); }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* No pulsing FAB — Carbon keeps animation purposeful */
@keyframes fabPulse {
  0%, 100% { box-shadow: 0 4px 12px rgba(15, 98, 254, 0.3); }
}

.animate-fade-in  { animation: fadeIn  var(--transition-normal) ease forwards; }
.animate-slide-up { animation: slideUp var(--transition-slow)   ease forwards; }
.animate-slide-down { animation: slideDown var(--transition-normal) ease forwards; }
.animate-scale-in { animation: scaleIn var(--transition-normal) ease forwards; }

/* ==================== Layout ==================== */
#app {
  display: flex;
  min-height: 100vh;
  position: relative;
  /* z-index: 1; <-- This was creating a stacking context that blocked sidebar interaction on mobile */
}

/* ==================== Login Page ==================== */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-primary);
}

.login-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0;               /* Carbon: square */
  padding: var(--space-2xl) var(--space-xl);
  width: 100%;
  max-width: 400px;
  animation: scaleIn var(--transition-slow) ease;
  /* Carbon: subtle shadow instead of glass blur */
  box-shadow: var(--shadow-lg);
}

.login-logo {
  text-align: left;              /* Carbon: left-aligned by default */
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.login-logo h1 {
  font-size: 1.25rem;           /* Carbon: productive-heading-03 */
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0;
  /* Carbon doesn't use gradient text — flat color */
  background: none;
  -webkit-text-fill-color: unset;
}

.login-logo p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: var(--space-xs);
  letter-spacing: 0.16px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.login-error {
  background: var(--danger-bg);
  color: var(--danger);
  padding: var(--space-sm) var(--space-md);
  border-radius: 0;
  border-left: 3px solid var(--danger);  /* Carbon: notification border */
  font-size: 0.875rem;
  display: none;
}

.login-error.visible {
  display: block;
  animation: slideDown var(--transition-fast) ease;
}

/* ==================== Sidebar (Carbon: Side Navigation) ==================== */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);    /* Carbon: $layer-01 */
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  height: var(--header-height);       /* Matches the top shell bar */
  display: flex;
  align-items: center;
  padding: 0 var(--space-md);
  border-bottom: 1px solid var(--border-color);
  background: #161616;               /* Carbon: shell header is darkest */
}

.sidebar-header h1 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.1px;
  /* Carbon logo/wordmark: flat, no gradient */
  background: none;
  -webkit-text-fill-color: unset;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm) 0;         /* Carbon: no horizontal padding on nav */
}

.nav-section {
  margin-bottom: var(--space-md);
}

.nav-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.1px;
  color: var(--text-tertiary);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: 0;
}

/* Carbon side-nav items: full-width, 32px tall, no radius */
.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0 var(--space-md);
  height: 32px;
  border-radius: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 400;
  transition: all var(--transition-fast);
  cursor: pointer;
  width: 100%;
  text-align: left;
  border-left: 4px solid transparent;   /* Carbon active indicator */
}

.nav-item:hover {
  background: #353535;                  /* layer-01-hover */
  color: var(--text-primary);
}

.nav-item.active {
  background: #e0e0e0;                  /* Carbon: selected side-nav item */
  color: #161616;
  border-left-color: var(--accent);
  font-weight: 600;
}

.nav-item .nav-icon {
  width: 16px;
  text-align: center;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.nav-item .nav-badge {
  margin-left: auto;
  background: transparent;
  padding: 0 var(--space-xs);
  border-radius: 0;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
  font-family: 'IBM Plex Mono', monospace;
}

.nav-group-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0 var(--space-md) 0 36px;   /* Carbon: nested nav indent */
  height: 32px;
  border-radius: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
  text-align: left;
}

.nav-group-item:hover {
  background: #353535;
  color: var(--text-primary);
}

.nav-group-item .group-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: var(--space-sm) 0;
  border-top: 1px solid var(--border-color);
}

.sidebar-footer button {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0 var(--space-md);
  height: 48px;                        /* Carbon: larger footer actions */
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-radius: 0;
  transition: all var(--transition-fast);
  width: 100%;
}

.sidebar-footer button:hover {
  background: var(--danger-bg);
  color: var(--danger);
}

/* ==================== Main Content ==================== */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Carbon Shell Header — 48px, sharp, dark */
.content-header {
  height: var(--header-height);
  padding: 0 var(--space-md);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
  /* Carbon: no blur on shell — solid surface */
  backdrop-filter: none;
  position: sticky;
  top: 0;
  z-index: 50;
}

.content-header h2 {
  font-size: 0.875rem;               /* Carbon shell title: body weight */
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: 0.16px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0 var(--space-md);
  height: 32px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.16px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.mobile-menu-btn:active {
  background: var(--bg-input);
}

/* Carbon Search (bx--search) */
.search-bar {
  position: relative;
  width: 240px;
}

.search-bar input {
  width: 100%;
  padding: 0 var(--space-md) 0 40px;
  height: 32px;
  background: var(--bg-tertiary);         /* Carbon: field slightly lighter in dark */
  border: none;
  border-bottom: 1px solid var(--border-color-hover);
  border-radius: 0;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.search-bar input::placeholder { color: var(--text-tertiary); }

.search-bar input:focus {
  background: var(--bg-tertiary);
  border-bottom-color: var(--accent);
  outline: none;
  box-shadow: none;
}

.search-bar .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 0.875rem;
  pointer-events: none;
}

/* Carbon Content Switcher / Filter tabs */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0;                                /* Carbon: content switcher has no gap */
  padding: var(--space-sm) var(--space-md);
  overflow-x: auto;
  flex-wrap: wrap;
  gap: var(--space-xs);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 var(--space-sm);
  height: 32px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 0;                      /* Carbon: square tags */
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.32px;
}

.filter-chip:hover {
  background: #454545;
  border-color: var(--border-color-hover);
  color: var(--text-primary);
}

.filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  font-weight: 500;
}

/* Content Body */
.content-body {
  flex: 1;
  padding: var(--space-lg) var(--space-xl);
  max-width: var(--max-content-width);
  width: 100%;
  margin: 0 auto;
}

/* ==================== Task Cards (Carbon: Tile / ClickableTile) ==================== */
.task-group-section {
  margin-bottom: var(--space-xl);
}

.task-group-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-sm);
}

.task-group-header .group-indicator {
  width: 3px;
  height: 16px;
  border-radius: 0;                     /* Carbon: sharp edges */
}

.task-group-header h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.16px;
}

.task-group-header .group-count {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-left: var(--space-xs);
  font-family: 'IBM Plex Mono', monospace;
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 1px;                             /* Carbon: tile rows share borders */
}

/* Carbon Tile — flat, bordered, no shadow at rest */
.task-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0;
  padding: var(--space-md);
  transition: background var(--transition-fast), border-color var(--transition-fast);
  cursor: pointer;
  position: relative;
  overflow: visible;
  animation: slideUp var(--transition-slow) ease forwards;
}

/* Carbon: left border accent for priority — sharp stroke, no pseudo-radius */
.task-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  transition: background var(--transition-fast);
}

.task-card.priority-0::before { background: transparent; }
.task-card.priority-1::before { background: var(--priority-high); }
.task-card.priority-2::before { background: var(--priority-urgent); }

.task-card.priority-1 { border-left-color: transparent; }
.task-card.priority-2 { border-left-color: transparent; }

/* Carbon ClickableTile hover */
.task-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: none;                      /* Carbon: no lift effect */
  box-shadow: none;
}

.task-card.completed { opacity: 0.45; }
.task-card.completed .task-title {
  text-decoration: line-through;
  color: var(--text-tertiary);
}

.task-card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

/* Carbon Checkbox */
.task-checkbox {
  position: relative;
  width: 18px;
  height: 18px;
  min-width: 18px;
  margin-top: 1px;
}

.task-checkbox input {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
  z-index: 2;
}

.task-checkbox .checkmark {
  position: absolute;
  top: 0;
  left: 0;
  width: 18px;
  height: 18px;
  border: 2px solid var(--text-secondary);    /* Carbon: checkbox border */
  border-radius: 0;                           /* Carbon: square checkbox */
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
}

.task-checkbox input:checked + .checkmark {
  background: var(--accent);
  border-color: var(--accent);
  animation: checkBounce 0.15s ease;
}

.task-checkbox .checkmark::after {
  content: '';
  width: 5px;
  height: 9px;
  border: 2px solid white;
  border-top: none;
  border-left: none;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.task-checkbox input:checked + .checkmark::after {
  opacity: 1;
}

.task-card-body {
  flex: 1;
  min-width: 0;
}

.task-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  word-wrap: break-word;
  letter-spacing: 0.16px;
}

.task-details {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
  line-height: 1.5;
  letter-spacing: 0.32px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  flex-wrap: wrap;
}

/* .task-date {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: 0;
} */

/* .task-date {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(---text-tertiary);
  background: var(--priority-normal);
  padding: 2px 6px;
  border-radius: 0;                   /* Carbon: square tag 
  font-family: 'IBM Plex Mono', monospace;
} */

.task-date {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;

  color: var(#ffffff, #ffffff);        /* text color */
  background: transparent;               /* remove fill */
  /*border: 1px solid var(--primary, #0f62fe); /* chip border */

  padding: 2px 6px;
  border-radius: 0px;                    /* or 0 if you want strict Carbon */
  font-family: 'IBM Plex Mono', monospace;
}

.task-date.overdue { color: var(--danger); }
.task-date.today   { color: var(--accent); }

/* .task-deadline {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--warning);
  background: var(--priority-normal);
  padding: 2px 6px;
  border-radius: 0;                   /* Carbon: square tag 
  font-family: 'IBM Plex Mono', monospace;
} */

.task-deadline {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;

  color: var(--primary, #ffffff);        /* text color */
  background: transparent;               /* remove fill */
  border: 1px solid var(--primary, #ffffff); /* chip border */

  padding: 2px 6px;
  border-radius: 0px;                    /* or 0 if you want strict Carbon */
  font-family: 'IBM Plex Mono', monospace;
}

/* Carbon Tag */
.priority-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.32px;
  padding: 0 var(--space-xs);
  height: 18px;
  border-radius: 0;
}

.priority-badge.urgent {
  background: var(--priority-urgent-bg);
  color: var(--priority-urgent);
  outline: 1px solid var(--priority-urgent);
}

.priority-badge.high {
  background: var(--priority-high-bg);
  color: var(--priority-high);
  outline: 1px solid var(--priority-high);
}

/* Carbon Tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: var(--space-sm);
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 var(--space-sm);
  height: 24px;                        /* Carbon: $spacing-06 tag height */
  border-radius: 0;
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.32px;
  border: 1px solid rgba(255,255,255,0.12);
  transition: all var(--transition-fast);
}

.tag-chip .tag-type-label {
  font-weight: 600;
  opacity: 0.65;
}

/* Subtasks */
.subtask-preview {
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-color);
}

.subtask-progress {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

/* Carbon ProgressBar */
.subtask-progress-bar {
  flex: 1;
  height: 4px;                         /* Carbon: default progress bar height */
  background: var(--bg-tertiary);
  border-radius: 0;
  overflow: hidden;
}

.subtask-progress-fill {
  height: 100%;
  background: var(--accent);           /* Carbon: no gradient, flat color */
  border-radius: 0;
  transition: width var(--transition-normal);
}

.subtask-progress-text {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  font-family: 'IBM Plex Mono', monospace;
}

.subtask-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: 4px 0;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.subtask-item.completed .subtask-title {
  text-decoration: line-through;
  color: var(--text-tertiary);
}

.subtask-title { flex: 1; }

.subtask-tags {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-top: 2px;
  margin-left: 28px;
}

.task-card-actions {
  display: flex;
  gap: var(--space-xs);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.task-card:hover .task-card-actions { opacity: 1; }

.task-action-btn {
  padding: 6px;
  border-radius: 0;
  color: var(--text-tertiary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.task-action-btn:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

.task-action-btn.delete:hover {
  background: var(--danger-bg);
  color: var(--danger);
}

/* ==================== FAB → Carbon Primary Button ==================== */
/* Carbon doesn't use FABs — nearest equivalent is a prominent primary btn */
.fab {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  height: 48px;
  padding: 0 var(--space-lg);
  border-radius: 0;
  background: var(--accent);          /* Carbon: $interactive, flat fill */
  color: white;
  font-size: 0.875rem;
  font-weight: 400;
  font-family: inherit;
  letter-spacing: 0.16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  box-shadow: var(--shadow-md);
  transition: background var(--transition-fast);
  z-index: 90;
  animation: none;
  min-width: 56px;
}

.fab:hover {
  background: var(--accent-hover);
  transform: none;                    /* Carbon: no scale/rotate on hover */
  box-shadow: var(--shadow-md);
}

/* ==================== Modal (Carbon: Modal) ==================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.65);   /* Carbon: $overlay */
  backdrop-filter: none;              /* Carbon: no blur on overlay */
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  animation: fadeIn var(--transition-fast) ease;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0;
  width: 100%;
  max-width: 608px;                   /* Carbon: default modal width */
  max-height: 85vh;
  overflow-y: auto;
  animation: slideUp var(--transition-normal) ease;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl) var(--space-md);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
  z-index: 10;
}

.modal-header h3 {
  font-size: 1.25rem;                /* Carbon: productive-heading-04 */
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: 0;
}

.modal-close {
  padding: var(--space-sm);
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  border-radius: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: calc(-1 * var(--space-sm));
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
}

.modal-body {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Carbon: modal actions in a dedicated footer bar */
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0;                             /* Carbon: button group — no gap, shared border */
  padding: var(--space-lg) var(--space-xl);
  border-top: 1px solid var(--border-color);
}

/* ==================== Form Controls (Carbon: TextInput, Select) ==================== */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-group label {
  font-size: 0.75rem;                 /* Carbon: label-01 */
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.32px;
  line-height: 1.333;
}

/* Carbon TextInput: underline-only on focus, flat rectangle body */
.form-input {
  padding: 0 var(--space-md);
  height: 40px;                       /* Carbon: text-input default height */
  background: var(--bg-input);
  border: none;
  border-bottom: 1px solid var(--border-color-hover);
  border-radius: 0;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
  width: 100%;
  display: block;
}

.form-input:focus {
  outline: 2px solid var(--accent);  /* Carbon: $focus ring */
  outline-offset: -2px;
  border-bottom-color: transparent;
  background: var(--bg-input);
  box-shadow: none;
}

.form-input::placeholder { color: var(--text-tertiary); }

textarea.form-input {
  padding: var(--space-sm) var(--space-md);
  height: auto;
  min-height: 80px;
  resize: vertical;
  line-height: 1.5;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-select {
  padding: 0 var(--space-md);
  height: 40px;
  background: var(--bg-input);
  border: none;
  border-bottom: 1px solid var(--border-color-hover);
  border-radius: 0;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 32 32'%3E%3Cpath fill='%238d8d8d' d='M16 22L6 12l1.4-1.4 8.6 8.6 8.6-8.6L26 12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  border-bottom-color: transparent;
  background-color: var(--bg-input);
}

.form-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ==================== Buttons (Carbon: Button) ==================== */
/* Carbon: all buttons are 0 radius, fixed heights, letter-spacing 0.16px */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0 var(--space-md);
  height: 40px;                       /* Carbon: default button height */
  border-radius: 0;
  font-size: 0.875rem;
  font-weight: 400;
  font-family: inherit;
  letter-spacing: 0.16px;
  transition: all var(--transition-fast);
  white-space: nowrap;
  border: 1px solid transparent;
}

/* Carbon: Primary Button */
.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: none;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: none;
  transform: none;
}

/* Carbon: Secondary Button */
.btn-secondary {
  background: transparent;
  border: 1px solid var(--text-secondary);
  color: var(--text-primary);
}

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

/* Carbon: Danger Button */
.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.btn-danger:hover {
  background: #b81922;
  border-color: #b81922;
}

/* Carbon: Ghost Button */
.btn-ghost {
  padding: 0 var(--space-sm);
  color: var(--accent);
  font-size: 0.875rem;
  height: 32px;
  border: none;
  background: transparent;
}

.btn-ghost:hover {
  color: var(--accent-hover);
  background: var(--accent-glow);
}

/* Carbon: Small button */
.btn-sm {
  height: 32px;
  padding: 0 var(--space-sm);
  font-size: 0.875rem;
}

/* ==================== Subtask Editor ==================== */
.subtask-editor {
  display: flex;
  flex-direction: column;
  gap: 1px;                           /* Carbon: list with hairline separators */
}

.subtask-editor-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border-radius: 0;
  border-bottom: 1px solid var(--border-color);
  animation: slideUp var(--transition-fast) ease;
}

.subtask-editor-item input {
  flex: 1;
  padding: 0;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
}

.subtask-editor-item .remove-subtask {
  padding: 4px;
  color: var(--text-tertiary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
  border-radius: 0;
}

.subtask-editor-item .remove-subtask:hover { color: var(--danger); }

.add-subtask-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--accent);
  font-size: 0.875rem;
  font-family: inherit;
  border-radius: 0;
  border: 1px dashed var(--border-color-hover);
  background: transparent;
  transition: all var(--transition-fast);
  letter-spacing: 0.16px;
}

.add-subtask-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent);
}

/* ==================== Tag Selector ==================== */
.tag-selector {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.tag-selector-group { margin-bottom: var(--space-sm); }

.tag-selector-group-title {
  font-size: 0.6875rem;               /* Carbon: helper-text-01 */
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.32px;
  color: var(--text-tertiary);
  margin-bottom: var(--space-xs);
}

.tag-selector-options {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.tag-option {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 var(--space-sm);
  height: 24px;
  border-radius: 0;
  font-size: 0.75rem;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  letter-spacing: 0.32px;
}

.tag-option:hover {
  border-color: var(--border-color-hover);
  color: var(--text-primary);
  background: var(--bg-glass-hover);
}

.tag-option.selected {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent);
}

/* ==================== Tag Manager ==================== */
.tag-manager {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.tag-type-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0;
  overflow: hidden;
  animation: slideUp var(--transition-slow) ease forwards;
}

.tag-type-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-color);
  height: 40px;
  background: var(--bg-tertiary);
}

.tag-type-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.tag-type-header .type-icon  { font-size: 0.875rem; }
.tag-type-header .type-name  { font-weight: 600; font-size: 0.875rem; }

.tag-type-header .type-color {
  width: 10px;
  height: 10px;
  border-radius: 0;
}

.tag-type-body {
  padding: var(--space-md);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag-type-body .tag-chip { cursor: default; }

.tag-type-body .tag-chip .tag-remove {
  cursor: pointer;
  opacity: 0.5;
  font-size: 0.75rem;
  transition: opacity var(--transition-fast);
}

.tag-type-body .tag-chip .tag-remove:hover {
  opacity: 1;
  color: var(--danger);
}

.add-tag-inline {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 var(--space-sm);
  height: 24px;
  border: 1px dashed var(--border-color-hover);
  border-radius: 0;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.add-tag-inline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

/* ==================== Toast (Carbon: Notification - inline) ==================== */
.toast-container {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  pointer-events: none;
  min-width: 320px;
}

.toast {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0;
  color: var(--text-primary);
  font-size: 0.875rem;
  box-shadow: var(--shadow-lg);
  animation: slideUp var(--transition-normal) ease;
  pointer-events: auto;
  backdrop-filter: none;
  letter-spacing: 0.16px;
}

/* Carbon: Notification type — left border accent */
.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--danger);  }
.toast.info    { border-left: 3px solid var(--accent);  }

/* ==================== Empty State ==================== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  animation: fadeIn var(--transition-slow) ease;
}

.empty-state .empty-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
  opacity: 0.25;
}

.empty-state h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
  letter-spacing: 0;
}

.empty-state p {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  max-width: 300px;
  line-height: 1.5;
  letter-spacing: 0.16px;
}

/* ==================== Loading Skeleton ==================== */
.skeleton {
  background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.2s infinite;
  border-radius: 0;
}

.skeleton-task {
  height: 64px;
  margin-bottom: 1px;
  border-radius: 0;
}

/* ==================== Confirm Dialog ==================== */
.confirm-dialog { text-align: left; }

.confirm-dialog p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
  line-height: 1.5;
  letter-spacing: 0.16px;
}

.confirm-dialog .confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0;
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  :root { --sidebar-width: 0px; }

  .sidebar {
    transform: translateX(-100%);
    width: 256px;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open { transform: translateX(0); }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.65);
    z-index: 99;                /* Ensure this is lower than .sidebar (100) */
  }

  .sidebar-backdrop.visible { display: block; }

  .main-content { margin-left: 0; }
  .mobile-menu-btn { display: flex; }

  .content-header {
    height: auto;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
  }

  .header-actions { 
    flex-wrap: wrap; 
    width: 100%;
    justify-content: space-between;
    gap: var(--space-sm);
  }

  .tag-filter-select {
    width: 100% !important; /* Override inline styles for mobile */
    max-width: 130px;
    flex-shrink: 0;
  }

  .search-bar {
    width: 100%;
    order: 10;
  }

  .form-row { grid-template-columns: 1fr; }

  .fab {
    bottom: var(--space-md);
    right: var(--space-md);
  }

  .modal { max-height: 90vh; }
}

/* ==================== Utility ==================== */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}