:root {
    --color-primary: #77b6eaff;
    /* argentinian-blue */
    --color-secondary: #c7d3ddff;
    /* columbia-blue */
    --color-background: #e8eef2ff;
    /* alice-blue */
    --color-accent: #d6c9c9ff;
    /* timberwolf */
    --color-dark: #37393aff;
    /* onyx */
    --shadow: 0 4px 6px rgba(55, 57, 58, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--color-background);
    color: var(--color-dark);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.site-header {
    background-color: var(--color-dark);
    color: var(--color-background);
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

.site-title {
    margin: 0;
    font-size: 2rem;
    color: var(--color-primary);
}

.main-nav ul {
    list-style-type: none;
    padding: 0;
}

.main-nav ul li {
    display: inline;
    margin-right: 1rem;
}

.main-nav ul li a {
    color: var(--color-background);
    text-decoration: none;
    transition: color 0.3s ease;
}

.main-nav ul li a:hover {
    color: var(--color-primary);
}

.main-content {
    margin-top: 2rem;
}

.task-form {
    background-color: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.task-form input[type="text"],
.task-form input[type="date"] {
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--color-secondary);
    border-radius: 4px;
    background-color: white;
    color: var(--color-dark);
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s ease, transform 0.1s ease;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-2px);
}

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

.btn-primary:hover {
    background-color: #5da1d9;
}

.task-list {
    list-style-type: none;
    padding: 0;
}

.task-item {
    background-color: white;
    border-left: 5px solid var(--color-primary);
    border-radius: 8px;
    margin-bottom: 1rem;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.task-item:hover {
    transform: translateY(-3px);
}

.task-complete {
    border-left-color: var(--color-accent);
    background-color: var(--color-secondary);
}

.task-complete .task-text {
    text-decoration: line-through;
    color: var(--color-dark);
    opacity: 0.7;
}

.task-checkbox {
    margin-right: 1rem;
    transform: scale(1.5);
    cursor: pointer;
}

.task-content {
    flex-grow: 1;
    color: var(--color-dark);
}

.task-text {
    font-size: 1.1rem;
    margin-right: 1rem;
    color: var(--color-dark);
}

.task-deadline {
    font-size: 0.9rem;
    color: var(--color-dark);
    opacity: 0.8;
}

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

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

.btn-edit {
    background-color: var(--color-secondary);
    color: var(--color-dark);
}

.btn-delete {
    background-color: #ff4136;
    color: white;
}

.no-tasks {
    text-align: center;
    color: var(--color-dark);
    opacity: 0.7;
    font-style: italic;
    margin-top: 2rem;
}

.site-footer {
    margin-top: 3rem;
    text-align: center;
    color: var(--color-dark);
    opacity: 0.8;
    font-size: 0.9rem;
}

.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    font-weight: bold;
}

.alert-success {
    background-color: #28a745;
    color: white;
}

.alert-error {
    background-color: #dc3545;
    color: white;
}

/* Auth styles */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
}

.auth-box {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow);
}

.auth-title {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: 2rem;
}

.auth-form .form-group {
    margin-bottom: 1.5rem;
}

.auth-input {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    border: 1px solid var(--color-secondary);
    border-radius: 4px;
    background-color: white;
    color: var(--color-dark);
    transition: border-color 0.3s ease;
}

.auth-input:focus {
    border-color: var(--color-primary);
    outline: none;
}

.btn-block {
    display: block;
    width: 100%;
}

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

.btn-secondary:hover {
    background-color: #b3c2cf;
}

@media (max-width: 768px) {
    .task-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .task-actions {
        margin-top: 1rem;
    }
}

.input-group {
    position: relative;
    margin-bottom: 1rem;
}

.input-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
}

.input-group input {
    padding-left: 40px !important;
}

.btn-icon {
    margin-right: 8px;
}

.action-icon {
    font-size: 1.2rem;
}

.deadline-icon {
    margin-right: 4px;
}

.empty-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.no-tasks {
    text-align: center;
    padding: 2rem;
}

.btn-edit,
.btn-delete {
    padding: 0.5rem;
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}