:root {
  --background-color: #fffaf0; /* Floral White - warmer */
  --primary-color: #ffffff;
  --secondary-color: #fdf5e6; /* Old Lace - warm beige */
  --accent-color: #c85a19; /* Terracotta/Burnt Orange */
  --accent-color-light: #f9a825; /* Sunny Yellow */
  --success-color: #2e7d32; /* Warmer Green */
  --text-primary: #4e342e; /* Dark Brown */
  --text-secondary: #795548; /* Mid-tone Brown */
  --border-color: #d7ccc8; /* Brownish Gray */
  --shadow-color: rgba(121, 85, 72, 0.1); /* Brown-based shadow */
  --font-family: 'Noto Serif SC', serif;
  --danger-color: #d32f2f; /* Deeper Red */
  --kanban-todo: #bcaaa4; /* Warm Gray/Taupe */
  --kanban-inprogress: #ffb74d; /* Warm Orange */
  --kanban-completed: var(--success-color);
  --priority-high-color: var(--danger-color);
  --priority-medium-color: #ffa726; /* Bright Orange */
  --priority-low-color: #66bb6a; /* Soft Green */
  --workload-low: #ffe0b2; /* Light Warm Orange */
  --workload-medium: var(--priority-medium-color);
  --workload-high: var(--priority-high-color);
  --critical-path-color: #ab47bc; /* Warm Purple/Magenta */

  /* Diff colors */
  --diff-added-bg: #e6ffed;
  --diff-added-border: #28a745;
  --diff-modified-bg: #fffbe6;
  --diff-modified-border: #ffc107;
  --diff-deleted-bg: #fff1f0;
  --diff-deleted-border: #ff4d4f;
  --diff-field-highlight: #fff3cd;
}

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

html, body {
  height: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem;
  overflow-y: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--secondary-color);
}
::-webkit-scrollbar-thumb {
  background-color: var(--accent-color-light);
  border-radius: 10px;
  border: 2px solid var(--secondary-color);
}
::-webkit-scrollbar-thumb:hover {
  background-color: #e49b20;
}


#app-container {
  width: 100%;
  max-width: 1600px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.app-header {
  text-align: center;
}

.app-header h1 {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  text-shadow: 1px 1px 0 var(--secondary-color);
}

.app-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

#auth-section,
#input-section {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  transition: opacity 0.3s ease, transform 0.3s ease;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

/* --- Auth Section --- */
#auth-section {
    max-width: 450px;
}
.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}
.auth-tab-btn {
    flex: 1;
    padding: 1rem;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    transition: all 0.2s ease;
}
.auth-tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}
#login-form, #register-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
#login-form .form-group,
#register-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
#login-form label,
#register-form label {
    font-weight: 600;
}
#login-form input,
#register-form input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--background-color);
    transition: all 0.2s ease;
}
#login-form input:focus,
#register-form input:focus {
    outline: none;
    border-color: var(--accent-color-light);
    box-shadow: 0 0 0 3px rgba(249, 168, 37, 0.3);
}

.error-message {
    color: var(--danger-color);
    font-size: 0.9rem;
    text-align: center;
}


.input-card {
    background-color: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 25px -5px var(--shadow-color), 0 8px 10px -6px var(--shadow-color);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    transition: border-style 0.2s ease, border-color 0.2s, background-color 0.2s;
}

.input-card.dragover {
  border-style: dashed;
  border-color: var(--accent-color);
  background-color: var(--secondary-color);
}
.input-card.dragover::after {
  content: '松手即可上传文件';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-color);
  background: rgba(253, 245, 230, 0.8);
  border-radius: 12px;
  pointer-events: none;
  z-index: 1;
}


.input-card h3 {
    font-size: 1.5rem;
    text-align: center;
    color: var(--text-primary);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    position: relative;
}
.input-card h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: var(--accent-color-light);
}

.file-preview-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: -0.5rem; /* Pull up to reduce space with textarea */
  width: 100%;
}
.file-preview-item {
  position: relative;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--secondary-color);
  aspect-ratio: 1 / 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 0.5rem;
  text-align: center;
}
.file-preview-item .preview-image {
  width: 100%;
  height: 60%;
  object-fit: cover;
}
.file-preview-item .file-icon {
  width: 48px;
  height: 48px;
  color: var(--text-secondary);
}
.file-preview-item .file-info {
  font-size: 0.8rem;
  color: var(--text-primary);
  margin-top: 0.5rem;
  width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-preview-item .remove-file-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  line-height: 20px;
  opacity: 0;
  transition: opacity 0.2s;
}
.file-preview-item:hover .remove-file-btn {
  opacity: 1;
}

textarea#project-input,
textarea#quick-add-input {
  background-color: var(--secondary-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 1rem;
  resize: vertical;
  min-height: 120px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

textarea#project-input:focus,
textarea#quick-add-input:focus {
  outline: none;
  border-color: var(--accent-color-light);
  box-shadow: 0 0 0 4px rgba(249, 168, 37, 0.3);
}

.button-group {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.primary-btn, .secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  border: 2px solid transparent;
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}

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

.primary-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  background-color: #af4d15;
  box-shadow: 0 7px 14px rgba(50,50,93,.1), 0 3px 6px rgba(0,0,0,.08);
}

.primary-btn:active:not(:disabled) {
    transform: translateY(1px);
}

.primary-btn:disabled {
  background-color: #bcaaa4;
  cursor: not-allowed;
}

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

.secondary-btn:hover:not(:disabled) {
    color: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}
.secondary-btn:active:not(:disabled) {
    transform: translateY(0px);
    background-color: var(--secondary-color);
}
.secondary-btn:disabled {
  color: var(--text-secondary);
  background-color: var(--secondary-color);
  border-color: var(--border-color);
  cursor: not-allowed;
  opacity: 0.6;
}

.secondary-btn.danger {
    color: var(--danger-color);
    border-color: var(--danger-color);
}
.secondary-btn.danger:hover {
    background-color: var(--diff-deleted-bg);
}

#refine-btn {
  color: var(--critical-path-color);
  border-color: var(--critical-path-color);
}
#refine-btn:hover:not(:disabled) {
  background-color: rgba(171, 71, 188, 0.1);
}

.icon {
  width: 20px;
  height: 20px;
}

.hidden {
  display: none !important;
}

/* --- History and Quick Add --- */
#history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 0.5rem;
}
.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--secondary-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}
.history-item:hover {
    border-color: var(--accent-color-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}
.history-item-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.history-item-name {
    font-weight: 600;
    color: var(--text-primary);
}
.role-badge {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    background-color: var(--accent-color-light);
    color: var(--text-primary);
}
.history-item-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.history-item-actions .load-btn {
    padding: 0.4rem 1rem;
    font-size: 0.9rem;
}
#quick-add-form {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
#quick-add-form h4 {
    font-size: 1.1rem;
    color: var(--text-primary);
}
#quick-add-form p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: -0.5rem;
}
#quick-add-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
#quick-add-form label {
    font-weight: 600;
    font-size: 0.9rem;
}
#quick-add-form select,
#quick-add-form textarea,
#quick-add-form input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font-family);
    background-color: var(--background-color);
    transition: all 0.2s ease;
}
#quick-add-form select:focus,
#quick-add-form textarea:focus,
#quick-add-form input:focus {
    outline: none;
    border-color: var(--accent-color-light);
    box-shadow: 0 0 0 3px rgba(249, 168, 37, 0.3);
}

#quick-add-form #quick-add-btn {
    align-self: flex-end;
}
.optional-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    margin-top: 1rem;
}
.optional-fields-header {
    grid-column: 1 / -1;
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: -0.5rem;
}


/* Timeline Section */
#timeline-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
    position: relative; /* For positioning the confirm bar */
}

#timeline-section.visible {
    opacity: 1;
    transform: translateY(0);
}

#app-top-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 1rem;
  margin-bottom: -1.5rem; /* Adjust to pull it up */
  position: relative;
  z-index: 5; /* Ensure it's above other content if needed */
}

#timeline-header {
  display: grid;
  grid-template-areas:
    "name name name name"
    "switcher specific filters actions";
  grid-template-columns: auto auto 1fr auto;
  align-items: center;
  margin-bottom: 2rem;
  gap: 1rem;
}
#project-name {
    grid-area: name;
    font-size: 2.2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 1rem;
}
.readonly-badge {
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    background-color: var(--secondary-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
/* Save Status Indicator */
#save-status-indicator {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}
#save-status-indicator .spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-color);
}

/* User Display & Avatar */
#user-display {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9rem;
}
.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.user-actions .secondary-btn {
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
}
.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    border: 2px solid var(--primary-color);
    box-shadow: 0 0 0 2px var(--accent-color-light);
}


.view-switcher {
    grid-area: switcher;
    display: flex;
    gap: 0.5rem;
    background-color: var(--secondary-color);
    padding: 0.5rem;
    border-radius: 8px;
    flex-wrap: wrap;
    border: 1px solid var(--border-color);
}
#view-specific-controls {
    grid-area: specific;
}
.button-group.timeline-actions {
    grid-area: actions;
}

.view-switcher button, .gantt-view-controls button {
    padding: 0.5rem 1rem;
    font-family: var(--font-family);
    font-size: 0.9rem;
    background-color: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
    font-weight: 600;
}
.view-switcher button:hover, .gantt-view-controls button:hover {
    background-color: var(--primary-color);
    color: var(--text-primary);
}
.view-switcher button.active, .gantt-view-controls button.active {
    background-color: var(--primary-color);
    color: var(--accent-color);
    font-weight: 700;
    box-shadow: 0 2px 5px var(--shadow-color);
}
.gantt-view-controls {
    display: flex;
    gap: 0.5rem;
    background-color: var(--secondary-color);
    padding: 0.5rem;
    border-radius: 8px;
    flex-wrap: wrap;
    border: 1px solid var(--border-color);
}

/* --- Filter and Sort --- */
#filter-sort-controls {
    grid-area: filters;
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}
.filter-group, .sort-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.sort-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.sort-group select {
    font-family: var(--font-family);
    font-size: 0.9rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--primary-color);
    cursor: pointer;
}

/* Multi-select Filter Styles */
.multi-select-filter {
    position: relative;
}
.multi-select-button {
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--primary-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}
.multi-select-button:hover {
    border-color: var(--text-secondary);
}
.multi-select-button.active {
    color: var(--accent-color);
    border-color: var(--accent-color);
}
.multi-select-button span {
    background: var(--accent-color);
    color: white;
    font-size: 0.75rem;
    padding: 0.1rem 0.4rem;
    border-radius: 10px;
}
.multi-select-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 0.5rem;
    background: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 5px 15px var(--shadow-color);
    z-index: 10;
    padding: 0.5rem;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    max-height: 300px;
    overflow-y: auto;
}
.multi-select-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}
.multi-select-option:hover {
    background: var(--secondary-color);
}
.multi-select-option input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--accent-color);
}
.multi-select-clear {
    background: none;
    border: none;
    text-align: right;
    color: var(--accent-color);
    cursor: pointer;
    padding: 0.5rem;
    font-weight: 600;
    font-size: 0.8rem;
    margin-top: 0.5rem;
    border-top: 1px solid var(--border-color);
}
.multi-select-empty {
    padding: 1rem;
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.9rem;
}


/* --- Report Dropdown --- */
.dropdown-container {
    position: relative;
    display: inline-block;
}
  
#report-btn-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
  
.dropdown-content {
    display: flex;
    flex-direction: column;
    position: absolute;
    background-color: var(--primary-color);
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px var(--shadow-color);
    z-index: 10;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    margin-top: 0.5rem;
    animation: fade-in 0.2s ease;
    right: 0; /* Align to the right of the button */
}
  
.dropdown-content button {
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    text-decoration: none;
    display: block;
    text-align: left;
    background: none;
    border: none;
    width: 100%;
    cursor: pointer;
    border-radius: 6px;
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 600;
}
  
.dropdown-content button:hover {
    background-color: var(--secondary-color);
}


/* Vertical Timeline View */
#timeline-container.vertical-view {
  position: relative;
  padding-left: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

#timeline-container.vertical-view::before {
  content: '';
  position: absolute;
  left: 0;
  top: 15px;
  bottom: 15px;
  width: 3px;
  background-color: var(--border-color);
  border-radius: 2px;
}

.phase {
  margin-bottom: 2.5rem;
  position: relative;
}

.phase-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  position: relative;
}
.phase-header h3 {
    font-size: 1.6rem;
    flex-grow: 1;
}
.phase-header .toggle-collapse {
    color: var(--text-secondary);
    padding: 0.2rem;
    transition: transform 0.3s ease;
}
.phase-header .toggle-collapse.collapsed {
    transform: rotate(-90deg);
}

.phase-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background-color: var(--accent-color);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  position: absolute;
  left: -2rem;
  top: 50%;
  transform: translate(-50%, -50%);
  border: 4px solid var(--background-color);
  z-index: 1;
}
.phase-content {
    overflow: hidden;
    transition: max-height 0.4s ease-in-out, opacity 0.4s ease-in-out;
    max-height: 40000px; /* Large value to allow content to expand */
    opacity: 1;
}
.phase-content.collapsed {
    max-height: 0;
    opacity: 0;
}


.nested-project {
    background: var(--secondary-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}
.nested-project h4.editable {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}
.nested-project-notes {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-style: italic;
}

.tasks-list {
  list-style: none;
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.nested-project .tasks-list {
    padding-left: 0;
}

.tasks-list .tasks-list {
  padding-left: 1.5rem;
  margin-top: 1rem;
  border-left: 2px solid var(--border-color);
}


.task-item {
  background-color: var(--primary-color);
  padding: 1rem;
  border-radius: 8px;
  border-left: 4px solid var(--priority-medium-color);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px -2px var(--shadow-color);
  animation: fade-in 0.5s ease-out;
  cursor: grab;
}

.task-item[data-priority="高"] {
  border-left-color: var(--priority-high-color);
}
.task-item[data-priority="低"] {
  border-left-color: var(--priority-low-color);
}

/* Drag and Drop Styles */
.task-item.dragging {
    opacity: 0.5;
    background: var(--secondary-color);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    cursor: grabbing;
}
.task-item.drag-over-top {
    border-top: 3px solid var(--accent-color);
}
.task-item.drag-over-bottom {
    border-bottom: 3px solid var(--accent-color);
}

/* AI Diff Styles */
.task-item.diff-added {
  background-color: var(--diff-added-bg);
  border-left-color: var(--diff-added-border) !important;
  box-shadow: 0 0 0 1px var(--diff-added-border);
}
.task-item.diff-modified {
  background-color: var(--diff-modified-bg);
  box-shadow: 0 0 0 1px var(--diff-modified-border);
}
.task-item-deleted {
  padding: 0.5rem 1rem;
  background-color: var(--diff-deleted-bg);
  border-left: 4px solid var(--diff-deleted-border);
  color: var(--text-secondary);
  border-radius: 8px;
  font-style: italic;
}
.task-item-deleted span {
  text-decoration: line-through;
}
.field-changed {
    background-color: var(--diff-field-highlight);
    padding: 1px 4px;
    border-radius: 4px;
    box-shadow: 0 0 0 1px var(--diff-modified-border);
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.task-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px -2px var(--shadow-color);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.task-main {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-grow: 1;
}

.task-main label {
  flex-grow: 1;
  color: var(--text-primary);
  font-weight: 600;
  transition: color 0.3s ease;
  position: relative;
}

.task-main label::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  height: 2px;
  background-color: var(--text-secondary);
  width: 0;
  transition: width 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.task-main input[type="checkbox"] {
  appearance: none;
  width: 1.5rem;
  height: 1.5rem;
  border: 2px solid var(--text-secondary);
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.task-main input[type="checkbox"]:checked {
  background-color: var(--text-primary);
  border-color: var(--text-primary);
}

.task-main input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  color: var(--primary-color);
  font-size: 1rem;
  font-weight: bold;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.task-item.completed > .task-header .task-main label {
  color: var(--text-secondary);
  font-weight: 400;
}

.task-item.completed > .task-header .task-main label::after {
  width: 100%;
}

.task-item.completed {
    border-left-color: var(--success-color);
    background-color: #fcfcfc;
    opacity: 0.8;
}

.task-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: #bcaaa4;
    padding: 0.2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}
.icon-btn:hover {
    color: var(--text-primary);
    background: #e2e8f0;
    transform: scale(1.1);
}
.icon-btn.delete-btn:hover {
    color: var(--danger-color);
}

.task-body {
    padding-left: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.task-details, .task-meta, .task-notes {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.task-notes {
    font-style: italic;
    background: var(--secondary-color);
    padding: 0.5rem;
    border-radius: 6px;
}

.task-meta {
    display: flex;
    gap: 1.2rem;
    align-items: center;
    flex-wrap: wrap;
}
.assignee-avatars {
    display: flex;
}
.assignee-avatars .avatar {
    width: 28px;
    height: 28px;
    margin-left: -10px;
    font-size: 0.8rem;
    box-shadow: 0 0 0 2px var(--primary-color);
}
.assignee-avatars .avatar:first-child {
    margin-left: 0;
}

.task-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.editable {
    cursor: pointer;
    position: relative;
    padding: 2px 4px;
    border-radius: 4px;
    font-weight: 700;
}
.editable:hover {
    background: var(--secondary-color);
}
.editable:hover::after {
    content: '✎';
    font-size: 0.8em;
    margin-left: 8px;
    color: var(--text-secondary);
}
input.inline-edit {
    font-family: var(--font-family);
    padding: 2px 4px;
    border: 1px solid var(--accent-color-light);
    border-radius: 4px;
    background: #fff;
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
}
input.inline-edit:focus {
    outline: 2px solid var(--accent-color-light);
}

.status-tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    color: white;
}
.status-todo { background-color: var(--kanban-todo); }
.status-inprogress { background-color: var(--kanban-inprogress); }
.status-completed { background-color: var(--kanban-completed); }


.add-task-btn {
    background: none;
    border: 2px dashed var(--border-color);
    color: var(--text-secondary);
    width: 100%;
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 1rem;
    transition: all 0.2s ease;
    font-weight: 600;
}
.add-task-btn:hover {
    background: var(--secondary-color);
    border-color: var(--accent-color-light);
    color: var(--text-primary);
}


/* --- Completion Animation --- */
.confetti-container {
  position: absolute;
  top: 1.75rem;
  left: 1.75rem;
  width: 0;
  height: 0;
  transform: translate(-50%, -50%);
  pointer-events: none;
  overflow: visible;
  z-index: 10;
}

.confetti {
  position: absolute;
  width: 8px;
  height: 8px;
  opacity: 0;
  animation: confetti-burst 1s ease-out forwards;
}

@keyframes confetti-burst {
  0% {
    opacity: 1;
    transform: translate(0, 0) rotate(var(--rotation-start));
  }
  100% {
    opacity: 0;
    transform: translate(var(--x-end), var(--y-end)) rotate(var(--rotation-end));
  }
}

/* --- Task Discussion --- */
.task-discussion {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}
.task-discussion-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    transition: background-color 0.2s;
}
.task-discussion-toggle:hover, .task-discussion-toggle.active {
    background-color: var(--secondary-color);
    color: var(--text-primary);
}
.task-discussion-toggle svg {
    width: 16px;
    height: 16px;
}
.task-discussion-area {
    padding: 1rem 0 0 1rem;
    animation: fade-in 0.3s ease;
}
.comments-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    margin-bottom: 1.5rem;
}
.comment-item {
    font-size: 0.95rem;
}
.comment-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
    position: relative;
}
.comment-author {
    font-weight: 700;
}
.comment-timestamp {
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.comment-body {
    padding-left: 46px; /* Align with author text */
}
.comment-content {
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
}
.mention {
    font-weight: 600;
    color: var(--accent-color);
    background-color: var(--secondary-color);
    padding: 1px 4px;
    border-radius: 4px;
}
.comment-attachments {
    margin-top: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}
.attachment-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease;
    max-width: 200px;
}
.attachment-item span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.attachment-item:hover {
    border-color: var(--accent-color);
    box-shadow: 0 2px 5px var(--shadow-color);
}
.attachment-item.image-attachment img {
    width: 32px;
    height: 32px;
    object-fit: cover;
    border-radius: 4px;
}
.attachment-item .file-icon {
    width: 24px;
    height: 24px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.comment-actions {
    position: absolute;
    top: -4px;
    right: 0;
    display: flex;
    gap: 0.25rem;
    background-color: var(--primary-color);
    border-radius: 16px;
    padding: 4px;
    border: 1px solid var(--border-color);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}
.comment-item:hover .comment-actions {
    opacity: 1;
    visibility: visible;
}
.comment-actions .icon-btn {
    color: var(--text-secondary);
}
.comment-actions .icon-btn:hover {
    background-color: var(--secondary-color);
}
.comment-actions .delete-comment-btn:hover {
    color: var(--danger-color);
}

.comment-edit-form {
    margin-top: 0.5rem;
}
.comment-edit-form textarea {
    width: 100%;
    min-height: 60px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem;
    font-family: var(--font-family);
    font-size: 0.9rem;
    resize: vertical;
}
.comment-edit-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.5rem;
}
.comment-edit-actions .secondary-btn, .comment-edit-actions .primary-btn {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.new-comment-form {
    display: flex;
    gap: 0.5rem;
    align-items: flex-start;
}
.comment-input-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.comment-input-wrapper textarea {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
    font-family: var(--font-family);
    font-size: 0.9rem;
    resize: vertical;
    min-height: 42px;
    background: var(--secondary-color);
}
.comment-input-wrapper textarea:focus {
    outline: none;
    border-color: var(--accent-color-light);
    box-shadow: 0 0 0 2px rgba(249, 168, 37, 0.3);
}
.comment-form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.comment-form-actions .primary-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    flex-shrink: 0;
}
.comment-attachments-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem;
    background-color: var(--background-color);
    border-radius: 6px;
}
.attachment-preview-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--secondary-color);
    font-size: 0.8rem;
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}
.remove-preview-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1;
    padding: 0;
}
.remove-preview-btn:hover {
    color: var(--danger-color);
}


/* Loading Overlay */
#loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 250, 240, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 100;
  backdrop-filter: blur(5px);
}

#loading-overlay p {
    margin-top: 1rem;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.app-footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 2rem;
}

/* Modal styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(78, 52, 46, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  backdrop-filter: blur(4px);
}
.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}
.modal-content {
  background: var(--primary-color);
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  width: 90%;
  max-width: 600px;
  transform: scale(0.95);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
  max-height: 90vh;
}
.modal-overlay.visible .modal-content {
  transform: scale(1);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}
.modal-header h2 {
  font-size: 1.5rem;
  color: var(--text-primary);
}
.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text-secondary);
  line-height: 1;
}
.modal-close-btn:hover {
  color: var(--text-primary);
}
.modal-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  overflow-y: auto;
  padding: 5px;
}
.modal-form .form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.modal-form .full-width {
  grid-column: 1 / -1;
}
.modal-form label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}
.modal-form input,
.modal-form textarea,
.modal-form select,
.modal-textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  font-family: var(--font-family);
  background-color: var(--background-color);
}
.modal-form input:focus,
.modal-form textarea:focus,
.modal-form select:focus,
.modal-textarea:focus {
  outline: none;
  border-color: var(--accent-color-light);
  box-shadow: 0 0 0 3px rgba(249, 168, 37, 0.3);
}
.modal-form textarea,
.modal-textarea {
  resize: vertical;
  min-height: 80px;
}
.modal-form select[multiple] {
    height: 120px;
    padding: 0;
}
.modal-form select[multiple] option {
    padding: 0.5rem 0.75rem;
}
.modal-form select[multiple] option:checked {
    background: var(--accent-color-light);
    color: var(--text-primary);
}
.modal-footer {
  grid-column: 1 / -1;
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}

/* Members Modal Specifics */
.modal-body {
    overflow-y: auto;
    flex-grow: 1;
}
.members-list, .members-checklist {
    list-style: none;
    max-height: 250px;
    overflow-y: auto;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.members-checklist {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    max-height: 300px;
}
.members-checklist .multi-select-option {
    padding: 0.75rem;
}
.member-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border-radius: 6px;
}
.member-item:nth-child(odd) {
    background-color: var(--secondary-color);
}
.member-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
}
.member-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.member-actions select {
    font-size: 0.9rem;
    padding: 0.25rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--primary-color);
}
.invite-section {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.invite-section h5 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}
.form-group-inline {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}
.form-group-inline select, .form-group-inline input {
    flex-grow: 1;
}

/* Report Modal Specifics */
.report-modal {
    max-width: 700px;
}
.report-modal .modal-body {
    overflow-y: auto;
    flex-grow: 1;
    margin-bottom: 1.5rem;
}
.report-modal .modal-body.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    gap: 1rem;
}
.report-content {
    white-space: pre-wrap;
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--secondary-color);
    padding: 1rem;
    border-radius: 8px;
}

/* Report History Modal */
.report-history-modal {
    max-width: 90vw;
    width: 1200px;
    height: 80vh;
}
.report-history-body {
    display: flex;
    gap: 1.5rem;
    overflow: hidden;
    flex-grow: 1;
    padding-bottom: 1rem;
}
.report-history-list {
    width: 350px;
    flex-shrink: 0;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
    padding-right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.report-list-item {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.report-list-item:hover, .report-list-item.active {
    background-color: var(--secondary-color);
    border-color: var(--accent-color-light);
}
.report-item-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.report-item-title {
    font-weight: 600;
}
.report-item-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.report-item-actions .icon-btn:hover {
    color: var(--danger-color);
}
.report-history-content {
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}
.report-content-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    font-style: italic;
    font-size: 1.2rem;
}
.report-content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}
.report-content-header h3 {
    font-size: 1.3rem;
    margin: 0;
}
.report-content-body {
    flex-grow: 1;
    line-height: 1.7;
    padding-right: 0.5rem;
}
.report-content-body h3 { font-size: 1.2rem; margin-top: 1rem; margin-bottom: 0.5rem; }
.report-content-body h4 { font-size: 1.1rem; margin-top: 0.75rem; margin-bottom: 0.5rem; }
.report-content-body p { margin-bottom: 1rem; }
.report-content-body ul { list-style-position: inside; padding-left: 1rem; margin-bottom: 1rem; }


/* --- Kanban Board --- */
.kanban-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  align-items: flex-start;
}
.kanban-column {
  background: var(--secondary-color);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
}
.kanban-column-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid;
}
.kanban-column-header h3 {
  font-size: 1.1rem;
}
.kanban-column-header .task-count {
  font-size: 0.9rem;
  background: var(--primary-color);
  padding: 0.1rem 0.5rem;
  border-radius: 10px;
  color: var(--text-secondary);
}
.kanban-column[data-status="待办"] .kanban-column-header { border-color: var(--kanban-todo); }
.kanban-column[data-status="进行中"] .kanban-column-header { border-color: var(--kanban-inprogress); }
.kanban-column[data-status="已完成"] .kanban-column-header { border-color: var(--kanban-completed); }

.kanban-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 100px;
}
.kanban-card {
  background: var(--primary-color);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 4px 10px var(--shadow-color);
  cursor: pointer;
  transition: all 0.2s ease;
}
.kanban-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.08);
}
.kanban-card h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}
.kanban-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.75rem;
}
.kanban-card-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.kanban-card-path {
  font-size: 0.75rem;
  color: var(--accent-color);
  font-style: italic;
  margin-bottom: 0.5rem;
}
.kanban-card.completed {
  opacity: 0.7;
}
.kanban-card.completed h4 {
  text-decoration: line-through;
}

/* --- Calendar View --- */
.calendar-view {
  background: var(--primary-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
}
.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}
.calendar-header h3 {
  font-size: 1.5rem;
}
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background-color: var(--border-color);
  border: 1px solid var(--border-color);
}
.calendar-weekday {
  text-align: center;
  padding: 0.5rem;
  background: var(--secondary-color);
  font-weight: 600;
  font-size: 0.9rem;
}
.calendar-day {
  background: var(--primary-color);
  min-height: 120px;
  padding: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: background-color 0.2s;
}
.calendar-day.other-month {
  background: var(--secondary-color);
  opacity: 0.7;
}
.calendar-day.today .day-number {
  background: var(--accent-color);
  color: var(--primary-color);
  border-radius: 50%;
  width: 1.8em;
  height: 1.8em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.calendar-events {
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.calendar-event {
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}
.calendar-event-start { background-color: var(--kanban-inprogress); color: white; }
.calendar-event-end { background-color: var(--kanban-completed); color: white; }

/* --- Dependency Map View --- */
.dependency-map-modal {
    max-width: 95vw;
    width: 95vw;
    height: 90vh;
    padding: 0;
}
.dependency-map-modal .modal-header {
    padding: 1rem 1.5rem;
    margin-bottom: 0;
}
.dependency-map-viewport {
    flex-grow: 1;
    overflow: hidden;
    cursor: grab;
    background-color: var(--secondary-color);
}
.dependency-map-container {
    position: relative;
    transform-origin: 0 0;
}
.dep-graph-svg {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 0;
    overflow: visible;
    width: 100%;
    height: 100%;
}
.dep-edge {
    stroke: var(--text-secondary);
    stroke-width: 2;
    marker-end: url(#arrowhead);
    opacity: 0.6;
}
.dep-edge.critical-path {
    stroke: var(--critical-path-color);
    stroke-width: 3;
    opacity: 1;
}
.dep-node {
    position: absolute;
    background-color: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    width: 200px;
    box-shadow: 0 4px 10px var(--shadow-color);
    z-index: 1;
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 5px solid;
}
.dep-node:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 15px rgba(0,0,0,0.1);
}
.dep-node[data-status="待办"] { border-left-color: var(--kanban-todo); }
.dep-node[data-status="进行中"] { border-left-color: var(--kanban-inprogress); }
.dep-node[data-status="已完成"] { border-left-color: var(--kanban-completed); }
.dep-node.critical-path {
    border-color: var(--critical-path-color);
    box-shadow: 0 0 0 3px var(--critical-path-color);
}
.dep-node strong {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.dep-node span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* --- Mind Map View --- */
.mindmap-view {
    position: relative;
    width: 100%;
    height: 70vh;
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
}
.mindmap-viewport {
    width: 100%;
    height: 100%;
    cursor: grab;
}
.mindmap-container {
    position: relative;
    transform-origin: 0 0;
    transition: transform 0.3s ease;
}
.mindmap-connectors {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: visible;
}
.mindmap-connector {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 2px;
    transition: d 0.3s ease;
}
.mindmap-node {
    position: absolute;
    display: flex;
    align-items: center;
    background-color: var(--primary-color);
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--shadow-color);
    width: 220px;
    height: 50px;
    padding: 0 1rem;
    transition: all 0.3s ease;
}
.mindmap-node[data-type="task"] {
    cursor: pointer;
}
.mindmap-node[data-type="task"]:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 15px rgba(0,0,0,0.1);
}
.mindmap-node-name {
    font-weight: 600;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-grow: 1;
}
.mindmap-node[data-type="project"] {
    background-color: var(--accent-color);
    color: white;
    font-size: 1.2rem;
    height: 60px;
}
.mindmap-node[data-type="phase"],
.mindmap-node[data-type="nested-project"] {
    background-color: var(--accent-color-light);
    color: var(--text-primary);
}
.mindmap-node[data-status="待办"] { border-left: 5px solid var(--kanban-todo); }
.mindmap-node[data-status="进行中"] { border-left: 5px solid var(--kanban-inprogress); }
.mindmap-node[data-status="已完成"] { border-left: 5px solid var(--kanban-completed); opacity: 0.7; }

.node-toggle {
    background-color: rgba(0,0,0,0.1);
    color: inherit;
    border: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    line-height: 18px;
    text-align: center;
    position: absolute;
    right: -10px;
    z-index: 1;
    transition: transform 0.2s;
}
.node-toggle:hover {
    transform: scale(1.2);
}
.mindmap-node.collapsed .node-toggle {
    background-color: var(--success-color);
    color: white;
}
.mindmap-controls {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 5;
}
.mindmap-controls button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--primary-color);
    box-shadow: 0 2px 8px var(--shadow-color);
    cursor: pointer;
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
}
.mindmap-controls button:hover {
    background: var(--secondary-color);
}
.mindmap-controls svg {
    width: 20px;
    height: 20px;
    fill: var(--text-secondary);
}


/* --- Chat Panel --- */
.chat-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 400px;
  height: 100%;
  background-color: var(--primary-color);
  box-shadow: -10px 0 30px rgba(0,0,0,0.1);
  z-index: 1100;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}
.chat-panel.open {
  transform: translateX(0);
}
.chat-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.4);
  z-index: 1099;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.chat-backdrop:not(.hidden) {
    opacity: 1;
}
.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}
.chat-header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}
#chat-model-selector {
    font-family: var(--font-family);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--secondary-color);
    color: var(--text-secondary);
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23795548' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.25em;
    padding-right: 2rem;
}
#chat-model-selector:focus {
    outline: none;
    border-color: var(--accent-color-light);
    box-shadow: 0 0 0 2px rgba(249, 168, 37, 0.3);
}
.chat-header h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin: 0;
}
.chat-header .icon-btn {
    font-size: 1.8rem;
    color: var(--text-secondary);
    line-height: 1;
}
.chat-history {
  flex-grow: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.chat-message-container {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 90%;
}
.chat-message {
  display: flex;
  gap: 0.75rem;
  width: 100%;
  align-items: flex-start;
}
.chat-message .message-content {
  background-color: var(--secondary-color);
  padding: 0.75rem 1rem;
  border-radius: 12px;
  font-size: 0.95rem;
  line-height: 1.5;
  word-break: break-word;
}
.chat-message-container:has(.user-message) {
  align-self: flex-end;
}
.chat-message.user-message {
  flex-direction: row-reverse;
}
.chat-message.user-message .message-content {
  background-color: var(--accent-color);
  color: white;
}
.chat-message-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin: 0.5rem 0;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.chat-message-container:hover .chat-message-actions {
    opacity: 1;
}
.chat-message-container:has(.user-message) .chat-message-actions {
    justify-content: flex-end;
    margin-right: 44px; /* Align with avatar */
}
.chat-message-container:has(.model-message) .chat-message-actions {
    margin-left: 44px; /* Align with avatar */
}
.chat-message-container.editing .chat-message,
.chat-message-container.editing .chat-message-actions:not(.edit-mode) {
    display: none;
}
.chat-edit-form {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.chat-edit-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: var(--font-family);
    resize: vertical;
    background: var(--background-color);
}
.chat-edit-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

.chat-action-btn {
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.2rem 0.6rem;
    font-size: 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-left: 0.5rem;
    font-weight: 600;
}
.chat-action-btn:hover {
    background-color: #e2e8f0;
    color: var(--text-primary);
}


.chat-message-sources {
    font-size: 0.8rem;
    margin: 0.5rem 0 0.5rem 40px; /* Align with message content */
    padding: 0.5rem 0.75rem;
    background-color: var(--secondary-color);
    border-radius: 8px;
}
.chat-message-sources h5 {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.chat-message-sources ul {
    list-style: decimal inside;
    padding-left: 0;
    margin: 0;
}
.chat-message-sources li {
    margin-bottom: 0.25rem;
}
.chat-message-sources a {
    color: var(--accent-color);
    text-decoration: none;
}
.chat-message-sources a:hover {
    text-decoration: underline;
}

.chat-form-container {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}
.chat-form {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

#chat-attachment-preview {
    margin-bottom: 0.75rem;
    display: flex;
    gap: 0.5rem;
    align-items: center;
    padding: 0.5rem;
    background-color: var(--secondary-color);
    border-radius: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}
#chat-attachment-preview img {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 4px;
}
#chat-attachment-preview .file-info {
    flex-grow: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
#chat-attachment-preview .remove-attachment-btn {
    font-size: 1.2rem;
    line-height: 1;
    padding: 0.25rem;
}

.message-attachment {
    max-width: 150px;
    margin-top: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
}
.user-message .message-content .message-attachment {
    align-self: flex-end;
}

#chat-input {
  flex-grow: 1;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  font-family: var(--font-family);
  resize: none;
  background: var(--background-color);
}
#chat-attachment-btn,
#chat-send-btn {
    padding: 0.75rem;
    min-width: 46px;
    flex-shrink: 0;
}
#chat-attachment-btn {
    background: var(--primary-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
#chat-attachment-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.chat-form-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
#chat-form-model-selector {
    font-family: var(--font-family);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.4rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--primary-color);
    color: var(--text-secondary);
    cursor: pointer;
}

.chat-message.thinking .message-content {
  display: flex;
  align-items: center;
  gap: 8px;
}
.chat-message.thinking .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-secondary);
  animation: typing-bounce 1.2s infinite ease-in-out;
}
.chat-message.thinking .dot:nth-child(2) { animation-delay: 0.15s; }
.chat-message.thinking .dot:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing-bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1.0); }
}

/* AI Changes Confirmation Bar */
#ai-changes-confirm-bar {
  position: sticky;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  width: fit-content;
  max-width: 90%;
  background-color: var(--text-primary);
  color: var(--primary-color);
  padding: 1rem 1.5rem;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  z-index: 1050;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  animation: fade-in 0.3s ease;
}
#ai-changes-confirm-bar p {
  font-weight: 600;
  margin: 0;
}
#ai-changes-confirm-bar .button-group {
  gap: 0.75rem;
}


@media (max-width: 1200px) {
    #timeline-header {
      grid-template-areas:
        "name name name"
        "switcher specific actions"
        "filters filters filters";
      grid-template-columns: auto auto 1fr;
    }
}
@media (max-width: 900px) {
    .kanban-board {
      grid-template-columns: 1fr;
    }
}


@media (max-width: 700px) {
    body {
        padding: 1rem;
    }
    .app-header h1 {
        font-size: 2rem;
    }
    #timeline-header {
      grid-template-areas:
        "name name"
        "actions actions"
        "switcher switcher"
        "specific specific"
        "filters filters";
      grid-template-columns: 1fr 1fr;
    }
    #user-display {
        margin-top: -1rem;
        margin-bottom: 0.5rem;
    }
    .button-group.timeline-actions {
        justify-content: flex-start;
    }
    .modal-form {
      grid-template-columns: 1fr;
    }
    .chat-panel {
        max-width: 100%;
    }
    .optional-fields {
        grid-template-columns: 1fr;
    }
}

/* About Modal Content Styles */
.about-content {
    font-family: var(--font-family);
    line-height: 1.7;
    color: var(--text-primary);
    max-height: 70vh;
    overflow-y: auto;
    padding-right: 1rem; /* for scrollbar */
}
.about-content h1 { font-size: 1.8rem; margin-bottom: 1rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; }
.about-content h2 { font-size: 1.5rem; margin-top: 1.5rem; margin-bottom: 1rem; }
.about-content h3 { font-size: 1.2rem; margin-top: 1rem; margin-bottom: 0.5rem; }
.about-content p { margin-bottom: 1rem; }
.about-content ul { list-style-position: inside; padding-left: 1rem; margin-bottom: 1rem; }
.about-content li { margin-bottom: 0.5rem; }
.about-content code { background-color: var(--secondary-color); border: 1px solid var(--border-color); padding: 0.2rem 0.4rem; border-radius: 4px; font-family: monospace; }
.about-content strong { font-weight: 700; }
.about-content hr { border: none; border-top: 1px solid var(--border-color); margin: 1rem 0;}