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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #fafafa;
    color: #212121;
    min-height: 100vh;
    line-height: 1.5;
}

.app {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 25px;
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    padding: 25px 35px;
    border-radius: 20px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 2px 8px rgba(255, 255, 255, 0.6),
        inset 0 -2px 8px rgba(0, 0, 0, 0.05);
}

h1 {
    color: #6b46c1;
    font-size: 2.2rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(107, 70, 193, 0.2);
}

.controls {
    display: flex;
    gap: 16px;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    gap: 12px;
    align-items: center;
}

.secondary-btn {
    background: transparent;
    color: #1976d2;
    border: 1px solid #1976d2;
    padding: 12px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.secondary-btn:hover {
    background: rgba(25, 118, 210, 0.08);
}

#searchInput {
    padding: 16px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    font-size: 16px;
    width: 280px;
    background: #ffffff;
    color: #212121;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

#searchInput:focus {
    outline: none;
    border-color: #1976d2;
    box-shadow: 0 0 0 2px rgba(25, 118, 210, 0.2);
}

#addTaskBtn {
    background: #1976d2;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

#addTaskBtn:hover {
    background: #1565c0;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.24);
}

#addTaskBtn:active {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.28);
}

#addTaskBtn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

#addTaskBtn:active::before {
    width: 300px;
    height: 300px;
}

.board {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.column {
    background: #ffffff;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12), 0 0 2px rgba(0, 0, 0, 0.08);
    min-height: 500px;
    transition: box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.column[data-status="new"] {
    border-top: 4px solid #f44336;
}

.column[data-status="scheduled"] {
    border-top: 4px solid #ff9800;
}

.column[data-status="progress"] {
    border-top: 4px solid #2196f3;
}

.column[data-status="completed"] {
    border-top: 4px solid #4caf50;
}

.column-header {
    padding: 24px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.column-header h3 {
    color: #212121;
    font-size: 1.25rem;
    font-weight: 500;
    margin: 0;
}

.task-count {
    background: #e3f2fd;
    color: #1976d2;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    min-width: 24px;
    text-align: center;
}

.task-list {
    padding: 16px 24px 24px;
    min-height: 400px;
}

.task-card {
    background: #ffffff;
    border: none;
    border-radius: 4px;
    padding: 16px;
    margin-bottom: 16px;
    cursor: move;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
}

.task-card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.16), 0 2px 4px rgba(0, 0, 0, 0.28);
    transform: translateY(-2px);
}

.task-card.dragging {
    opacity: 0.8;
    transform: rotate(2deg);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.24), 0 4px 8px rgba(0, 0, 0, 0.32);
}

.task-card.overdue {
    border-left: 4px solid #f44336;
    background: #ffebee;
}

.task-title {
    font-weight: 500;
    color: #212121;
    margin-bottom: 8px;
    font-size: 16px;
    line-height: 1.4;
}

.task-description {
    color: #757575;
    font-size: 14px;
    margin-bottom: 12px;
    line-height: 1.5;
}

.task-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: #757575;
}

.task-due {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 400;
}

.task-due.overdue {
    color: #f44336;
    font-weight: 500;
}

.task-assigned {
    background: #1976d2;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.task-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    display: none;
    gap: 4px;
}

.task-card:hover .task-actions {
    display: flex;
}

.task-action {
    background: #ffffff;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12);
    color: #757575;
}

.task-action:hover {
    background: #f5f5f5;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.16);
    color: #212121;
}

.task-list.drag-over {
    background: rgba(33, 150, 243, 0.08);
    border: 2px dashed #2196f3;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background: #ffffff;
    margin: 5% auto;
    padding: 32px;
    border-radius: 4px;
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 11px 15px -7px rgba(0, 0, 0, 0.2), 0 24px 38px 3px rgba(0, 0, 0, 0.14), 0 9px 46px 8px rgba(0, 0, 0, 0.12);
    animation: modalSlideIn 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.8);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.close {
    position: absolute;
    right: 16px;
    top: 16px;
    font-size: 24px;
    cursor: pointer;
    color: #757575;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
}

.close:hover {
    background: #f5f5f5;
    color: #212121;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #212121;
    font-size: 14px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 16px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    font-size: 16px;
    background: #ffffff;
    color: #212121;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    font-family: 'Roboto', sans-serif;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #1976d2;
    box-shadow: 0 0 0 2px rgba(25, 118, 210, 0.2);
}

.form-actions {
    display: flex;
    gap: 16px;
    justify-content: flex-end;
    margin-top: 32px;
}

.form-actions button {
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.form-actions button[type="submit"] {
    background: #4caf50;
    color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.form-actions button[type="submit"]:hover {
    background: #45a049;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.24);
}

.form-actions button[type="submit"]::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.form-actions button[type="submit"]:active::before {
    width: 300px;
    height: 300px;
}

#cancelBtn {
    background: transparent;
    color: #757575;
    border: 1px solid #e0e0e0;
}

#cancelBtn:hover {
    background: #f5f5f5;
    color: #212121;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app {
        padding: 16px;
    }
    
    header {
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px;
    }
    
    .controls {
        justify-content: space-between;
        flex-wrap: wrap;
    }
    
    #searchInput {
        width: 100%;
        margin-bottom: 16px;
    }
    
    .board {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .modal-content {
        margin: 8% auto;
        padding: 24px;
    }
    
    .task-list {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }
    
    .column {
        min-height: 400px;
    }
    
    .task-card {
        padding: 16px;
    }
    
    .column-header {
        padding: 16px;
    }
    
    .modal-content {
        padding: 16px;
        margin: 5% auto;
    }
    
    .form-actions {
        flex-direction: column;
        gap: 12px;
    }
    
    .form-actions button {
        width: 100%;
    }
}

footer {
    text-align: center;
    padding: 24px;
    margin-top: 32px;
    color: #757575;
    font-size: 14px;
    border-top: 1px solid #e0e0e0;
}

.footer-note {
    margin-top: 8px;
    font-size: 12px;
    opacity: 0.8;
}

.share-content {
    padding: 16px 0;
}

.input-copy, .input-join {
    display: flex;
    gap: 8px;
}

.input-copy input, .input-join input {
    flex: 1;
}

.input-copy button, .input-join button {
    background: #1976d2;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.share-note {
    margin-top: 16px;
    font-size: 12px;
    color: #757575;
    text-align: center;
}