/* HubSync - Enterprise Internal OS Design System */

:root {
  /* Neutral Base Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --bg-hover: #f0f0f0;
  --bg-active: #e8e8e8;
  
  /* Text Colors */
  --text-primary: #0a0a0a;
  --text-secondary: #525252;
  --text-tertiary: #737373;
  --text-disabled: #a3a3a3;
  
  /* Single Accent Color */
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --accent-dark: #1e40af;
  
  /* Semantic Colors */
  --success: #059669;
  --success-light: #d1fae5;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  
  /* Borders */
  --border: #e5e5e5;
  --border-strong: #d4d4d4;
  
  /* Shadows - Minimal */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 8px 0 rgba(0, 0, 0, 0.08);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: ui-monospace, 'SF Mono', Consolas, monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  height: 100vh;
  overflow: hidden;
}

/* Layout */
.app-container {
  display: flex;
  height: 100vh;
  background: var(--bg-primary);
}

/* Sidebar */
.sidebar {
  width: 240px;
  background: var(--bg-primary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.logo-icon {
  width: 24px;
  height: 24px;
  color: var(--accent);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.nav-section {
  margin-bottom: 16px;
}

.nav-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-tertiary);
  padding: 8px 16px 4px;
  letter-spacing: 0.05em;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
  margin: 1px 8px;
  border-radius: 6px;
}

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

.nav-item.active {
  background: var(--accent-light);
  color: var(--accent-dark);
  font-weight: 500;
}

.nav-item svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
  flex-shrink: 0;
}

.nav-badge {
  margin-left: auto;
  background: var(--accent);
  color: white;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 10px;
  font-weight: 600;
  min-width: 20px;
  text-align: center;
}

.nav-badge.unread {
  background: var(--danger);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Top Header */
.top-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  height: 56px;
}

.page-title-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

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

.page-breadcrumb {
  font-size: 13px;
  color: var(--text-tertiary);
}

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

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  width: 240px;
  transition: all 0.15s ease;
}

.search-box:focus-within {
  border-color: var(--accent);
  background: var(--bg-primary);
}

.search-box svg {
  width: 16px;
  height: 16px;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.search-box input {
  border: none;
  background: none;
  outline: none;
  flex: 1;
  font-size: 13px;
  color: var(--text-primary);
  min-width: 0;
}

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

.user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 6px 10px 6px 6px;
  border-radius: 6px;
  transition: background 0.15s ease;
  border: 1px solid transparent;
}

.user-menu:hover {
  background: var(--bg-hover);
  border-color: var(--border);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 12px;
  flex-shrink: 0;
}

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

.user-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  border: 2px solid var(--bg-primary);
  position: absolute;
  bottom: -2px;
  right: -2px;
}

/* Content Area */
.content-area {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

/* Buttons */
.btn {
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  background: var(--bg-primary);
  color: var(--text-primary);
}

.btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

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

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

.btn svg {
  width: 16px;
  height: 16px;
  stroke-width: 2;
}

/* Cards & Sections */
.section {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 16px;
}

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

.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.section-content {
  padding: 16px;
}

/* Project Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.project-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.project-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.project-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.project-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.project-icon svg {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
}

.project-info {
  flex: 1;
  min-width: 0;
}

.project-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  letter-spacing: -0.01em;
}

.project-description {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-meta {
  display: flex;
  gap: 16px;
  padding-top: 12px;
  margin-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-tertiary);
}

.project-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.project-meta-item svg {
  width: 14px;
  height: 14px;
}

/* Task List */
.task-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.15s ease;
  cursor: pointer;
}

.task-item:hover {
  border-color: var(--border-strong);
  background: var(--bg-secondary);
}

.task-checkbox {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--border-strong);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
  margin-top: 2px;
}

.task-checkbox:hover {
  border-color: var(--accent);
}

.task-checkbox.checked {
  background: var(--accent);
  border-color: var(--accent);
  position: relative;
}

.task-checkbox.checked::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

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

.task-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-tertiary);
}

.task-tag {
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
}

.priority-badge {
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.priority-urgent { background: var(--danger-light); color: var(--danger); }
.priority-high { background: var(--warning-light); color: var(--warning); }
.priority-medium { background: var(--accent-light); color: var(--accent-dark); }
.priority-low { background: var(--bg-tertiary); color: var(--text-tertiary); }

/* Status Badge */
.status-badge {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  border: 1px solid;
}

.status-online { background: var(--success-light); color: var(--success); border-color: var(--success); }
.status-away { background: var(--warning-light); color: var(--warning); border-color: var(--warning); }
.status-offline { background: var(--bg-tertiary); color: var(--text-tertiary); border-color: var(--border); }

/* Communication Tabs */
.comm-tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
  background: var(--bg-primary);
}

.comm-tab {
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.comm-tab:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.comm-tab.active {
  color: var(--accent-dark);
  border-bottom-color: var(--accent);
}

.comm-tab svg {
  width: 16px;
  height: 16px;
}

/* Chat List */
.chat-list {
  display: flex;
  flex-direction: column;
}

.chat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  transition: background 0.15s ease;
  border-left: 2px solid transparent;
}

.chat-item:hover {
  background: var(--bg-hover);
}

.chat-item.active {
  background: var(--accent-light);
  border-left-color: var(--accent);
}

.chat-item.unread {
  background: var(--bg-secondary);
}

.chat-avatar {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  color: var(--text-secondary);
  flex-shrink: 0;
  position: relative;
}

.chat-info {
  flex: 1;
  min-width: 0;
}

.chat-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.chat-preview {
  font-size: 12px;
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-item.unread .chat-preview {
  color: var(--text-primary);
  font-weight: 500;
}

.chat-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  flex-shrink: 0;
}

.chat-time {
  font-size: 11px;
  color: var(--text-tertiary);
}

.chat-unread-count {
  background: var(--accent);
  color: white;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-tertiary);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--text-disabled);
  stroke-width: 1.5;
}

.empty-state h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.empty-state p {
  font-size: 13px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-disabled);
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    width: 200px;
  }
}