/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --card-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

@media (max-width: 768px) {
    body {
        padding: 12px;
    }
}

/* ===== Container ===== */
.container {
    max-width: 1600px;
    margin: 0 auto;
}

/* ===== Header ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    gap: 16px;
    flex-wrap: wrap;
}

.title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    white-space: nowrap;
}

.header-controls {
    display: flex;
    gap: 8px;
    flex: 1;
    min-width: 200px;
    max-width: 600px;
    align-items: center;
}

@media (max-width: 768px) {
    .title {
        font-size: 22px;
        width: 100%;
    }
    
    .header-controls {
        width: 100%;
        max-width: 100%;
    }
}

.inline-input {
    flex: 1;
    padding: 10px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: all 0.2s ease;
}

.inline-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

/* ===== Buttons ===== */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    outline: none;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

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

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

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-icon {
    padding: 6px 10px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-icon:hover {
    background: var(--card-hover);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

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

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

/* ===== Projects Grid ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
    gap: 24px;
    align-items: start;
}

@media (max-width: 1400px) {
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    }
}

@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}

/* ===== Project Card ===== */
.project-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid transparent;
    animation: fadeIn 0.3s ease;
}

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

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

.project-card {
    cursor: default;
}

.project-card.dragging {
    opacity: 0.5;
    cursor: move;
}

.project-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(99, 102, 241, 0.05) 100%);
    gap: 12px;
}

.project-drag-handle {
    color: var(--text-muted);
    cursor: grab;
    font-size: 20px;
    user-select: none;
    line-height: 1;
}

.project-drag-handle:active {
    cursor: grabbing;
}

.project-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.3px;
    word-break: break-word;
    flex: 1;
}

.project-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .project-card {
        cursor: default !important;
    }
    
    .project-card[draggable="true"] {
        pointer-events: none;
    }
    
    .project-header {
        padding: 16px;
    }
    
    .project-drag-handle {
        display: none;
    }
    
    .project-name {
        font-size: 16px;
    }
}

/* ===== Task List ===== */
.task-controls {
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(99, 102, 241, 0.03);
}

.task-controls-top {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .task-controls {
        padding: 12px 16px;
    }
}

.task-input-wrapper {
    width: 100%;
}

.task-input {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: all 0.2s ease;
}

.task-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.task-controls-left {
    display: flex;
    gap: 8px;
    align-items: center;
}

.toggle-completed {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.toggle-completed input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.task-list {
    padding: 12px;
    height: 400px;
    overflow-y: auto;
    resize: vertical;
    min-height: 200px;
    max-height: 800px;
}

@media (max-width: 768px) {
    .task-list {
        resize: none;
        height: auto;
        max-height: none;
    }
}

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

.task-list::-webkit-scrollbar-track {
    background: var(--card-bg);
}

.task-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

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

.task-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    cursor: pointer;
    gap: 12px;
}

.task-item:hover {
    background: var(--card-hover);
    border-color: var(--border-color);
    transform: translateX(4px);
}

@media (max-width: 768px) {
    .task-item {
        padding: 12px;
        gap: 8px;
    }
    
    .task-item:hover {
        transform: translateX(2px);
    }
}

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

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

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

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

.drag-handle {
    color: var(--text-muted);
    cursor: grab;
    font-size: 18px;
    user-select: none;
}

.drag-handle:active {
    cursor: grabbing;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--success-color);
}

.task-name {
    font-size: 15px;
    color: var(--text-primary);
    flex: 1;
    cursor: text;
    word-break: break-word;
    min-width: 0;
}

.task-name-input {
    flex: 1;
    padding: 4px 8px;
    background: var(--card-hover);
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    min-width: 0;
}

.task-actions {
    display: flex;
    gap: 6px;
    opacity: 0;
    transition: opacity 0.2s ease;
    flex-shrink: 0;
}

.task-item:hover .task-actions {
    opacity: 1;
}

@media (max-width: 768px) {
    .task-actions {
        opacity: 1;
    }
    
    .task-name {
        font-size: 14px;
    }
    
    .drag-handle {
        font-size: 16px;
    }
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 14px;
}

/* ===== Hidden Projects Modal ===== */
.hidden-projects-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content-box {
    position: relative;
    background: var(--card-bg);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 500px;
    max-width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    animation: slideUp 0.3s ease;
}

@media (max-width: 768px) {
    .modal-content-box {
        min-width: 0;
        width: 90%;
        padding: 20px;
        max-height: 85vh;
    }
    
    .modal-content-box h2 {
        font-size: 18px;
    }
}

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

.modal-content-box h2 {
    margin-bottom: 20px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.hidden-projects-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.hidden-project-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
    gap: 12px;
}

.hidden-project-item:hover {
    border-color: var(--text-muted);
    background: var(--card-hover);
}

.hidden-project-item span {
    font-size: 15px;
    color: var(--text-primary);
    word-break: break-word;
    flex: 1;
    min-width: 0;
}

.hidden-project-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.close-modal-btn {
    width: 100%;
}

@media (max-width: 768px) {
    .hidden-project-item {
        padding: 12px;
        flex-direction: column;
        align-items: flex-start;
    }
    
    .hidden-project-actions {
        width: 100%;
        justify-content: stretch;
    }
    
    .hidden-project-actions .btn {
        flex: 1;
    }
}

/* ===== Sync Modal ===== */
.sync-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.2s ease;
}

.sync-modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.sync-modal-content {
    position: relative;
    background: var(--card-bg);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 500px;
    max-width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    animation: slideUp 0.3s ease;
}

.sync-modal-content h2 {
    margin-bottom: 24px;
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
}

.sync-modal-content h3 {
    margin-bottom: 12px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
}

.sync-section {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.sync-section:last-of-type {
    border-bottom: none;
}

.sync-key-display {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.sync-key-display span {
    flex: 1;
    font-family: monospace;
    font-size: 14px;
    color: var(--text-primary);
    word-break: break-all;
}

.sync-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.sync-buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.sync-buttons button {
    flex: 1;
}

.sync-note {
    font-size: 13px;
    color: var(--text-muted);
    margin: 0;
}

.sync-status {
    min-height: 40px;
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.sync-status.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.sync-status.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

.sync-status.info {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.backup-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    margin-top: 8px;
}

.backup-item:hover {
    border-color: var(--text-muted);
}

.backup-time {
    font-size: 14px;
    color: var(--text-primary);
}

.backup-info {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

@media (max-width: 768px) {
    .sync-modal-content {
        min-width: 0;
        width: 90%;
        padding: 20px;
        max-height: 90vh;
    }
    
    .sync-modal-content h2 {
        font-size: 20px;
    }
    
    .sync-buttons {
        flex-direction: column;
    }
    
    .sync-actions {
        flex-direction: column;
    }
    
    .sync-actions button {
        width: 100%;
    }
}