/* Reset und Basis Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light Theme */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-primary: #3b82f6;
    --accent-secondary: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --border: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"], .dark-theme {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --accent-primary: #60a5fa;
    --accent-secondary: #22d3ee;
    --border: #475569;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: all 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.theme-toggle:hover {
    background: var(--accent-primary);
    color: white;
    transform: scale(1.1);
}

.stats {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Add Task Section */
.add-task-section {
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    align-items: flex-end;
}

#taskInput {
    flex: 1;
    min-width: 250px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

#taskInput:focus {
    background: var(--bg-primary);
    box-shadow: 0 0 0 2px var(--accent-primary);
}

#addTaskBtn {
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

#addTaskBtn:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
}

/* Filter Section */
.filter-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.filter-buttons {
    display: flex;
    gap: 0.5rem;
}

.filter-btn {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: 0.75rem;
    color: var(--text-secondary);
}

#searchInput {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem 0.5rem 0.5rem 2.5rem;
    border-radius: 8px;
    outline: none;
    width: 200px;
    transition: all 0.3s ease;
}

#searchInput:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

/* Tasks Container */
.tasks-container {
    background: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    min-height: 400px;
    overflow: hidden;
}

.tasks-list {
    padding: 1rem;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border);
    cursor: grab;
    transition: all 0.3s ease;
}

.task-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.task-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.task-item.completed {
    opacity: 0.6;
}

.task-item.completed .task-text {
    text-decoration: line-through;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.task-checkbox.checked {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.task-text {
    font-weight: 500;
    word-break: break-word;
}

.task-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.priority-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.priority-high {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.priority-medium {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.priority-low {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

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

.action-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

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

.action-btn.delete:hover {
    color: var(--error);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    width: 90%;
    max-width: 500px;
    animation: slideIn 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.close-btn:hover {
    color: var(--error);
    background: var(--bg-tertiary);
}

.modal-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.modal-body input,
.modal-body select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 8px;
    outline: none;
    transition: all 0.3s ease;
}

.modal-body input:focus,
.modal-body select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.btn-primary,
.btn-secondary {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

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

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

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

/* Priority Selector Styles */
.priority-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 200px;
}

.priority-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.priority-options {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-tertiary);
    padding: 0.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.priority-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: transparent;
    border: 2px solid transparent;
    min-width: 60px;
    position: relative;
}

.priority-option:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.priority-option.active {
    background: var(--bg-secondary);
    box-shadow: var(--shadow);
}

.priority-option[data-priority="low"] {
    color: var(--success);
}

.priority-option[data-priority="low"].active {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

.priority-option[data-priority="medium"] {
    color: var(--warning);
}

.priority-option[data-priority="medium"].active {
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.1);
}

.priority-option[data-priority="high"] {
    color: var(--error);
}

.priority-option[data-priority="high"].active {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.priority-option i {
    font-size: 1.25rem;
    margin-bottom: 0.125rem;
}

.priority-option span {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Priority Animation */
.priority-option::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: currentColor;
    border-radius: 50%;
    opacity: 0.3;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

.priority-option:active::before {
    width: 100%;
    height: 100%;
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

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

.task-item {
    animation: slideInUp 0.3s ease;
}

/* Delete Modal Styles */
.delete-modal .modal-content {
    max-width: 450px;
    border: 2px solid var(--error);
}

.delete-header {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.05));
    border-bottom: 1px solid rgba(239, 68, 68, 0.2);
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem 1.5rem 1rem;
    position: relative;
}

.delete-icon {
    width: 60px;
    height: 60px;
    background: var(--error);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: white;
    font-size: 1.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.delete-header h3 {
    color: var(--error);
    font-size: 1.25rem;
    margin: 0;
}

.delete-header .close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.delete-body {
    padding: 1.5rem;
    text-align: center;
}

.delete-body p {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.task-preview {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    text-align: left;
}

.task-preview .preview-text {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    word-break: break-word;
}

.task-preview .preview-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.warning-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.delete-footer {
    padding: 1.5rem;
    gap: 1rem;
}

.btn-danger {
    background: var(--error);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-danger:active {
    transform: translateY(0);
}

.delete-footer .btn-secondary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Animation für das Delete Modal */
.delete-modal.show .modal-content {
    animation: shakeIn 0.5s ease;
}

@keyframes shakeIn {
    0% {
        opacity: 0;
        transform: scale(0.8) rotate(-2deg);
    }
    50% {
        transform: scale(1.05) rotate(1deg);
    }
    100% {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .filter-section {
        flex-direction: column;
        gap: 1rem;
    }
    
    .filter-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .input-group {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    #taskInput {
        min-width: auto;
        width: 100%;
    }
    
    .priority-selector {
        order: 2;
    }
    
    #addTaskBtn {
        order: 3;
        align-self: center;
        min-width: 120px;
    }
    
    .task-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .task-actions {
        align-self: flex-end;
    }
    
    .priority-selector {
        min-width: auto;
        width: 100%;
    }
    
    .priority-options {
        justify-content: space-between;
    }
    
    .priority-option {
        flex: 1;
        min-width: auto;
    }
    
    .delete-modal .modal-content {
        margin: 20px;
        max-width: calc(100vw - 40px);
    }
    
    .delete-header {
        padding: 1.5rem 1rem 0.5rem;
    }
    
    .delete-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .delete-footer {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .delete-footer button {
        width: 100%;
        justify-content: center;
    }
}