:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-bg: #f9f9f9;
    --dark-text: #333;
    --light-text: #767676;
    --todo-bg: white;
    --todo-border: #e0e0e0;
    --todo-checked: #ecf0f1;
    --todo-checked-text: #95a5a6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light-bg);
    color: var(--dark-text);
    line-height: 1.6;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-title {
    flex: 1;
    text-align: center;
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 5px;
}

.header-subtitle {
    color: var(--light-text);
    font-size: 1.1rem;
}

.user-profile {
    display: none;
    align-items: center;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 10px;
}

.user-name {
    color: var(--dark-text);
    font-weight: 500;
    margin-right: 15px;
}

.logout-button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.logout-button:hover {
    background-color: #c0392b;
}

.main-container {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.todo-section {
    flex: 1;
    min-width: 300px;
}

.calendar-section {
    flex: 1;
    min-width: 300px;
}

.date-display {
    text-align: center;
    margin-bottom: 20px;
    padding: 10px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 5px;
}

.day-name {
    font-size: 1.8rem;
    font-weight: bold;
}

.date-value {
    font-size: 1.2rem;
}

.todo-list {
    background-color: var(--todo-bg);
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-bottom: 20px;
}

.todo-heading {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.8rem;
    border-bottom: 1px solid var(--secondary-color);
    padding-bottom: 10px;
}

.todo-item {
    display: flex;
    align-items: center;
    padding: 12px;
    border-bottom: 1px solid var(--todo-border);
    transition: background-color 0.3s ease;
}

.todo-item:last-child {
    border-bottom: none;
}

.todo-item:hover {
    background-color: rgba(52, 152, 219, 0.05);
}

.todo-checkbox {
    margin-right: 15px;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.todo-content {
    flex: 1;
}

.todo-title {
    font-weight: bold;
    color: var(--dark-text);
    margin-bottom: 3px;
    transition: color 0.3s ease, text-decoration 0.3s ease;
}

.todo-details {
    font-size: 0.9rem;
    color: var(--light-text);
    display: flex;
    justify-content: space-between;
}

.todo-time {
    color: var(--secondary-color);
}

.todo-calendar {
    font-style: italic;
}

.todo-item.checked {
    background-color: var(--todo-checked);
}

.todo-item.checked .todo-title {
    color: var(--todo-checked-text);
    text-decoration: line-through;
}

.text-input-container {
    margin-top: 20px;
}
.todo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--secondary-color);
    padding-bottom: 10px;
}

.refresh-button {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    padding: 5px 12px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: background-color 0.3s ease;
}

.refresh-button:hover {
    background-color: var(--accent-color);
}

.refresh-icon {
    font-size: 1.1rem;
    display: inline-block;
}

.refresh-button.refreshing .refresh-icon {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.text-input {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--todo-border);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    resize: none;
    height: 100px;
}

.text-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

.submit-button {
    display: block;
    margin-top: 10px;
    padding: 10px 20px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

.submit-button:hover {
    background-color: var(--accent-color);
}

.calendar-container {
    background-color: var(--todo-bg);
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    height: 500px;
    overflow: hidden;
}

/* Login button styles */
.login-button {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
    margin: 20px auto;
    display: block;
}

.login-button:hover {
    background-color: var(--accent-color);
}

/* Error message styles */
.error-message {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: none;
}

/* Loading indicator */
.loading-spinner {
    display: none;
    text-align: center;
    margin: 20px 0;
}

.loading-spinner:after {
    content: " ";
    display: inline-block;
    width: 40px;
    height: 40px;
    margin: 8px;
    border-radius: 50%;
    border: 6px solid var(--secondary-color);
    border-color: var(--secondary-color) transparent var(--secondary-color) transparent;
    animation: loading-spinner 1.2s linear infinite;
}

@keyframes loading-spinner {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Success message */
.success-message {
    background-color: #d4edda;
    color: #155724;
    padding: 10px 15px;
    border-radius: 5px;
    margin-bottom: 15px;
    text-align: center;
    display: none;
}

/* Responsive design */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .main-container {
        flex-direction: column;
    }
    
    .calendar-container {
        height: 400px;
        margin-top: 30px;
    }
    
    header {
        flex-direction: column;
    }
    
    .user-profile {
        margin-top: 15px;
    }
}


footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--secondary-color);
    color: var(--light-text);
    font-size: 0.9rem;
}