/* ==========================================================================
   PERSONAL CODING OS — DESIGN SYSTEM (Linear + GitHub + Notion + LeetCode)
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-base: #07090e;
  --bg-surface: #0c1017;
  --bg-elevated: #121824;
  --bg-highlight: #192233;
  --bg-active: #202b40;
  
  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-bright: rgba(255, 255, 255, 0.22);
  
  /* Accents */
  --color-primary: #10b981; /* Electric Emerald */
  --color-primary-glow: rgba(16, 185, 129, 0.22);
  --color-secondary: #06b6d4; /* Electric Cyan */
  --color-accent: #8b5cf6; /* Tech Purple */
  --color-warning: #f59e0b; /* Amber */
  --color-danger: #ef4444; /* Rose Red */
  --color-info: #3b82f6; /* Blue */
  --color-leetcode: #ffa116; /* LeetCode Orange */

  /* Text */
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #05080e;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;

  /* Layout */
  --sidebar-width: 260px;
  --header-height: 64px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  height: 100%;
  width: 100%;
  background-color: var(--bg-base);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Code & Mono Elements */
code, pre, .font-mono, .mono-badge, .stat-number {
  font-family: var(--font-mono);
}

/* App Shell Layout */
#app {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

/* Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 30;
  transition: transform var(--transition-smooth);
}

.sidebar-header {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(16,185,129,0.2), rgba(6,182,212,0.2));
  border: 1px solid rgba(16,185,129,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.brand-pill {
  font-size: 10px;
  font-family: var(--font-mono);
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-primary);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-weight: 600;
}

/* Quick Search Trigger */
.sidebar-search-btn {
  margin: 14px 16px 8px;
  padding: 8px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.sidebar-search-btn:hover {
  border-color: var(--border-medium);
  color: var(--text-main);
  background: var(--bg-highlight);
}

.kbd-badge {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

/* Nav Links */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-section-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  padding: 12px 10px 4px;
  font-weight: 600;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
}

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

.nav-item.active {
  background: rgba(16, 185, 129, 0.12);
  color: var(--color-primary);
  font-weight: 600;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--color-primary);
  border-radius: 0 3px 3px 0;
}

.nav-badge {
  margin-left: auto;
  font-size: 10px;
  font-family: var(--font-mono);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--bg-highlight);
  color: var(--text-muted);
}

.nav-badge.danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Sidebar Footer / User Profile */
.sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.2);
}

.user-snippet {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--bg-highlight);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.user-details {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.2;
}

.user-subtext {
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* Main Content Area */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-base);
}

/* Top App Header */
.top-header {
  height: var(--header-height);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(12, 16, 23, 0.85);
  backdrop-filter: blur(12px);
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  z-index: 20;
}

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

.header-title-wrap {
  display: flex;
  flex-direction: column;
}

.header-page-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.header-breadcrumb {
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

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

.header-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  border-radius: var(--radius-md);
  padding: 7px 12px;
  font-size: 12px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.header-btn:hover {
  background: var(--bg-highlight);
  color: var(--text-main);
  border-color: var(--border-medium);
}

.header-btn.primary {
  background: var(--color-primary);
  color: var(--text-inverse);
  border-color: var(--color-primary);
  font-weight: 600;
}

.header-btn.primary:hover {
  opacity: 0.92;
  box-shadow: 0 0 16px var(--color-primary-glow);
}

/* Page Scroll Container */
.page-content-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 28px;
}

.page-container {
  max-width: 1340px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Card System */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: relative;
  transition: var(--transition-smooth);
}

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

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.card-subtitle {
  font-size: 12px;
  color: var(--text-dim);
}

/* Grid Utilities */
.grid-cols-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.grid-cols-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.grid-cols-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.grid-cols-5 {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 500;
  font-family: var(--font-mono);
  border: 1px solid transparent;
}

.badge-emerald {
  background: rgba(16, 185, 129, 0.12);
  color: var(--color-primary);
  border-color: rgba(16, 185, 129, 0.3);
}

.badge-cyan {
  background: rgba(6, 182, 212, 0.12);
  color: var(--color-secondary);
  border-color: rgba(6, 182, 212, 0.3);
}

.badge-purple {
  background: rgba(139, 92, 246, 0.12);
  color: var(--color-accent);
  border-color: rgba(139, 92, 246, 0.3);
}

.badge-amber {
  background: rgba(245, 158, 11, 0.12);
  color: var(--color-warning);
  border-color: rgba(245, 158, 11, 0.3);
}

.badge-red {
  background: rgba(239, 68, 68, 0.12);
  color: var(--color-danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.badge-gray {
  background: var(--bg-highlight);
  color: var(--text-muted);
  border-color: var(--border-subtle);
}

/* Progress Bar Component */
.progress-bar-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
}

.progress-track {
  width: 100%;
  height: 7px;
  background: var(--bg-highlight);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  transition: width 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-fill.cyan { background: var(--color-secondary); }
.progress-fill.purple { background: var(--color-accent); }
.progress-fill.amber { background: var(--color-warning); }
.progress-fill.gradient-emerald {
  background: linear-gradient(90deg, #10b981, #06b6d4);
}

/* Status Indicator Dots */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.status-dot.completed { background: var(--color-primary); box-shadow: 0 0 8px var(--color-primary-glow); }
.status-dot.in_progress { background: var(--color-secondary); box-shadow: 0 0 8px rgba(6,182,212,0.3); }
.status-dot.not_started { background: var(--text-dim); }

/* Quick Stat Cards */
.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-dim);
  font-size: 12px;
  font-weight: 500;
}

.stat-value-group {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.stat-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
}

.stat-subtext {
  font-size: 11px;
  color: var(--text-dim);
}

/* Today's Plan Session Cards */
.session-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
}

.session-card.active-session {
  border-color: rgba(16, 185, 129, 0.4);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.04) 0%, var(--bg-surface) 100%);
}

.session-card.completed-session {
  border-color: rgba(16, 185, 129, 0.2);
  background: rgba(16, 185, 129, 0.02);
}

.session-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

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

.session-time {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.session-topic-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
}

.session-topic-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

.session-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
}

/* Topic Item Checklist Card */
.topic-item-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  transition: var(--transition-fast);
}

.topic-item-card:hover {
  background: var(--bg-highlight);
  border-color: var(--border-medium);
}

.topic-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.topic-checkbox {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1.5px solid var(--border-medium);
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: transparent;
  transition: var(--transition-fast);
  flex-shrink: 0;
}

.topic-checkbox.checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--text-inverse);
}

.topic-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-main);
}

.topic-title.completed {
  text-decoration: line-through;
  color: var(--text-dim);
}

.topic-sub {
  font-size: 11.5px;
  color: var(--text-dim);
}

/* 3-State Status Selector Pill */
.status-pill-select {
  display: flex;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 2px;
}

.status-pill-opt {
  padding: 3px 9px;
  font-size: 11px;
  border-radius: var(--radius-full);
  color: var(--text-dim);
  cursor: pointer;
  transition: var(--transition-fast);
  font-weight: 500;
}

.status-pill-opt.active {
  background: var(--bg-highlight);
  color: var(--text-main);
  font-weight: 600;
}

.status-pill-opt.active.completed {
  background: rgba(16, 185, 129, 0.2);
  color: var(--color-primary);
}

.status-pill-opt.active.in_progress {
  background: rgba(6, 182, 212, 0.2);
  color: var(--color-secondary);
}

/* LeetCode Tracker Component */
.leetcode-month-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.lc-counter-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.lc-btn-inc {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

.lc-btn-inc:hover {
  background: var(--color-primary);
  color: var(--text-inverse);
  border-color: var(--color-primary);
}

.lc-input-num {
  width: 58px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  padding: 4px;
}

/* Timeline & Expandable Months (Roadmap Page) */
.timeline-phase-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
}

.phase-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
}

.month-accordion-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.month-accordion-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  background: var(--bg-surface);
  transition: var(--transition-fast);
}

.month-accordion-header:hover {
  background: var(--bg-elevated);
}

.month-accordion-content {
  padding: 0 20px 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Contribution Heatmap (GitHub Style) */
.heatmap-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.heatmap-grid {
  display: grid;
  grid-template-rows: repeat(7, 12px);
  grid-auto-flow: column;
  grid-auto-columns: 12px;
  gap: 4px;
}

.heatmap-cell {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--bg-elevated);
  border: 1px solid rgba(255, 255, 255, 0.03);
  cursor: pointer;
  transition: var(--transition-fast);
}

.heatmap-cell:hover {
  outline: 1.5px solid var(--color-primary);
  z-index: 5;
}

.heatmap-cell.level-1 { background: #064e3b; border-color: #065f46; }
.heatmap-cell.level-2 { background: #047857; border-color: #059669; }
.heatmap-cell.level-3 { background: #10b981; border-color: #34d399; }
.heatmap-cell.level-4 { background: #34d399; border-color: #6ee7b7; box-shadow: 0 0 6px rgba(52, 211, 153, 0.4); }

/* Modal & Command Palette */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(3, 5, 8, 0.82);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.7);
  width: 100%;
  max-width: 640px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.96);
  transition: transform var(--transition-smooth);
}

.modal-backdrop.open .modal-card {
  transform: scale(1);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

/* Command Search Modal Special Styling */
.search-modal-box {
  max-width: 580px;
}

.search-input-wrap {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 15px;
  outline: none;
}

.search-results-list {
  max-height: 380px;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.search-result-item {
  padding: 10px 14px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: var(--transition-fast);
}

.search-result-item:hover, .search-result-item.selected {
  background: var(--bg-elevated);
  border: 1px solid var(--border-medium);
}

/* Form Controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.form-input, .form-textarea, .form-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
  transition: var(--transition-fast);
}

.form-textarea {
  font-family: var(--font-mono);
  min-height: 120px;
  resize: vertical;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-glow);
}

/* 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: var(--bg-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  color: var(--text-main);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.5);
  animation: slideInUp 250ms ease;
}

.toast.success { border-color: rgba(16, 185, 129, 0.4); }
.toast.error { border-color: rgba(239, 68, 68, 0.4); }

@keyframes slideInUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Mobile Bottom Navigation (Hidden on desktop) */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(12, 16, 23, 0.95);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-subtle);
  z-index: 50;
  justify-content: space-around;
  align-items: center;
  padding: 0 12px;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 10px;
  font-weight: 500;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.mobile-nav-item.active {
  color: var(--color-primary);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .grid-cols-4, .grid-cols-5 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .app-sidebar {
    display: none;
  }
  .mobile-bottom-nav {
    display: flex;
  }
  .top-header {
    padding: 0 16px;
  }
  .page-content-wrapper {
    padding: 16px 16px 80px;
  }
  .grid-cols-2, .grid-cols-3, .grid-cols-4, .grid-cols-5 {
    grid-template-columns: 1fr;
  }
}