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

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* App Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* Shortcuts Sidebar */
.shortcuts-sidebar {
    width: 140px;
    flex-shrink: 0;
    padding: var(--spacing-lg) var(--spacing-md);
    display: flex;
    flex-direction: column;
    opacity: 1;
}

.shortcuts-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    position: sticky;
    top: var(--spacing-lg);
}

.shortcut-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 10px;
    color: var(--color-text-secondary);
}

.shortcut-item span {
    font-weight: 500;
    letter-spacing: 0.2px;
    text-transform: uppercase;
    font-size: 11px;
}

.shortcut-item .keys {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
}

.shortcut-item kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 4px;
    font-size: 9px;
    font-family: inherit;
    font-weight: 500;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 3px;
}

/* Container */
.container {
    flex: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-md);
}

.title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

/* Input Section */
.input-section {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-md);
    position: relative;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
}

.task-input {
    flex: 1;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.task-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.task-input::placeholder {
    color: var(--color-text-muted);
}

.add-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--color-primary);
    color: white;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

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

.add-btn:active {
    background-color: var(--color-primary);
}

.bulk-add-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.bulk-add-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.bulk-add-btn:active {
    background-color: var(--color-border-light);
}

/* Filter Section */
.filter-section {
    margin-bottom: var(--spacing-md);
}

.filter-row-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.filter-row-bottom {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.filter-toggles {
    display: flex;
    gap: var(--spacing-xs);
}

.filter-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.category-filter-chip {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.category-filter-chip:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.category-filter-chip.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.sort-wrapper {
    display: flex;
    gap: var(--spacing-xs);
}

.sort-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-family: inherit;
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.sort-select:hover {
    border-color: var(--color-primary);
}

.sort-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.sort-direction-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sort-direction-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.sort-direction-btn:active {
    background-color: var(--color-border-light);
}

/* Task List */
.task-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    overflow-y: auto;
    padding-right: 4px;
    min-height: 120px;
    position: relative;
    scrollbar-gutter: stable;
}

.task-list::-webkit-scrollbar {
    width: 8px;
}

.task-list::-webkit-scrollbar-track {
    background: transparent;
}

.task-list::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

.task-list::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

/* Task Card */
.task-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

.task-card.keyboard-selected {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.task-card:hover {
    box-shadow: var(--shadow-md);
}

.task-card:active {
    box-shadow: var(--shadow-sm);
}

.task-card.completed {
    opacity: 0.6;
    background-color: var(--color-bg);
    border-color: var(--color-border);
    box-shadow: none;
}

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

.task-card.completed .task-meta {
    opacity: 0.5;
    pointer-events: none;
}

.task-card.completed .meta-clickable {
    opacity: 0.4;
    pointer-events: none;
}

.task-card.completed .task-actions {
    pointer-events: none;
    opacity: 0.4;
}

.task-title {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-primary);
    word-break: break-word;
}

.task-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
}

.inline-title-input {
    width: 100%;
    font-size: var(--font-size-base);
    font-weight: 500;
    font-family: inherit;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    outline: none;
}

.inline-title-input:focus {
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

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

.priority-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.priority-badge.low {
    background-color: var(--priority-low-bg);
    color: var(--priority-low);
}

.priority-badge.medium {
    background-color: var(--priority-medium-bg);
    color: var(--priority-medium);
}

.priority-badge.high {
    background-color: var(--priority-high-bg);
    color: var(--priority-high);
}

.priority-badge.none {
    background-color: var(--color-border-light);
    color: var(--color-text-muted);
    border: 1px dashed var(--color-border);
}

.category-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--spacing-sm);
    border-radius: var(--radius-full);
    background-color: var(--color-border-light);
    color: var(--color-text-secondary);
    font-size: 11px;
    font-weight: 500;
}

.due-date-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--color-text-secondary);
}

.due-date-badge.overdue {
    color: var(--color-danger);
    font-weight: 500;
}

.due-date-badge svg {
    width: 12px;
    height: 12px;
}

/* Clickable Meta Elements */
.meta-clickable {
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
}

.meta-clickable.keyboard-focused {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px var(--color-focus-ring);
}

.meta-clickable:hover {
    filter: brightness(0.9);
    background-color: var(--color-border-light);
}

.meta-clickable:active {
    filter: brightness(0.85);
}

.meta-clickable.add-meta {
    opacity: 0.5;
}

.meta-clickable.add-meta:hover {
    opacity: 1;
    background-color: var(--color-border-light);
}

/* Inline Edit Popup */
.inline-edit-popup {
    position: fixed;
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    z-index: 100;
    min-width: 140px;
    animation: fadeInPopup var(--transition-fast);
}

@keyframes fadeInPopup {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.inline-edit-popup .priority-option {
    display: block;
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    background-color: transparent;
    cursor: pointer;
    text-align: left;
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-fast);
}

.inline-edit-popup .priority-option:hover {
    background-color: var(--color-border-light);
}

.inline-edit-popup .priority-option.low { color: var(--priority-low); }
.inline-edit-popup .priority-option.medium { color: var(--priority-medium); }
.inline-edit-popup .priority-option.high { color: var(--priority-high); }

.inline-edit-popup .priority-option.highlighted {
    background-color: var(--color-border-light);
}

/* Category Inline Edit */
.category-inline-input {
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-family: inherit;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.category-inline-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.category-list {
    max-height: 150px;
    overflow-y: auto;
    border-top: 1px solid var(--color-border);
}

.category-list-item {
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-fast);
}

.category-list-item:hover,
.category-list-item.highlighted {
    background-color: var(--color-border-light);
}

/* Date Inline Edit */
.date-inline-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.date-inline-input {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-family: inherit;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
}

.date-clear-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.date-clear-btn:hover {
    background-color: var(--priority-high-bg);
    border-color: var(--color-danger);
    color: var(--color-danger);
}

.task-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.task-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

/* Empty State */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--color-text-muted);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.empty-state.visible {
    display: flex;
}

.empty-state svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state p {
    font-size: var(--font-size-base);
}

/* Footer */
.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.clear-completed-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: transparent;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.clear-completed-btn:hover {
    border-color: var(--color-danger);
    color: var(--color-danger);
}

.clear-completed-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 400px;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal-overlay.visible .modal {
    transform: scale(1);
}

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

.modal-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background-color: transparent;
    font-size: 24px;
    color: var(--color-text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.edit-input,
.edit-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
}

.edit-input:focus,
.edit-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.edit-row {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.btn-secondary,
.btn-primary {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-secondary:hover {
    background-color: var(--color-border-light);
}

.btn-primary {
    border: none;
    background-color: var(--color-primary);
    color: white;
}

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

/* Bulk Add Modal */
.bulk-add-modal {
    max-width: 500px;
}

.bulk-add-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

.bulk-add-textarea {
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    resize: vertical;
    min-height: 150px;
}

.bulk-add-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.bulk-add-stats {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    min-height: 20px;
}

/* Responsive */
@media (max-width: 480px) {
    .app-layout {
        flex-direction: column;
    }

    .shortcuts-sidebar {
        display: none;
    }

    .container {
        padding: var(--spacing-md);
    }

    .filter-row-top {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-sm);
    }

    .filter-toggles {
        justify-content: center;
    }

    .sort-wrapper {
        width: 100%;
    }

    .sort-select {
        flex: 1;
    }

    .footer {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}