/* Basic Reset and Variables */
:root {
    --bg-dark-primary: #121212; /* Darker background */
    --bg-dark-secondary: #1a1a1a; /* Slightly lighter for cards */
    --text-light: #e0e0e0; /* Off-white for main text */
    --text-muted: #9e9e9e; /* Muted text for details */
    --accent-blue: #8e24aa; /* Deep Purple */
    --accent-green: #43a047; /* Success Green */
    --accent-yellow: #fdd835; /* Warning Yellow */
    --accent-red: #e53935; /* Error Red */
    --border-color: #333;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5); /* Stronger shadow */
    --card-gradient: linear-gradient(135deg, var(--bg-dark-secondary) 0%, #252525 100%);
    --button-gradient: linear-gradient(45deg, var(--accent-blue) 0%, #ab47bc 100%);
}

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

body {
    font-family: 'Poppins', sans-serif; /* Modern font */
    background: var(--bg-dark-primary);
    color: var(--text-light);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styling */
header {
    background: linear-gradient(90deg, #3f004f, #8e24aa); /* Gradient header */
    padding: 1.8rem 0;
    text-align: center;
    box-shadow: var(--box-shadow);
    color: #fff;
}

.header-content h1 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.header-content p {
    font-size: 1.1rem;
    color: #e0e0e0;
}

/* Wrapper for main content */
.wrapper {
    flex-grow: 1;
    padding: 30px 20px;
    display: flex;
    justify-content: center; /* Center the container */
    align-items: flex-start; /* Align to the top of the flex container */
}

/* Main Container (3-Column Layout) */
.container {
    display: flex;
    max-width: 1500px; /* Wider container */
    width: 100%; /* Ensure it takes full width up to max */
    gap: 30px; /* Increased gap */
    
    /* Responsive behavior for smaller screens */
    flex-wrap: wrap; /* Allow columns to wrap */
    justify-content: center; /* Center columns when wrapped */
}

.task-column, .app-center {
    padding: 25px;
    border-radius: 12px; /* More rounded corners */
    background: var(--card-gradient); /* Subtle gradient for cards */
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color); /* Subtle border */
    display: flex;
    flex-direction: column;
}

.task-column {
    flex: 1;
    min-width: 300px; /* Minimum width before wrapping */
}

.app-center {
    flex: 1.5; /* Center column is significantly wider */
    min-width: 350px;
}

/* Headings */
h2 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 1.6rem;
    color: var(--accent-blue);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Form Styling */
#task-form input[type="text"], 
#task-form input[type="date"], 
#task-form input[type="time"],
#task-form select {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #2c2c2c; /* Slightly different input bg */
    color: var(--text-light);
    font-size: 1rem;
    transition: all 0.3s ease;
}

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

#task-form input:focus, #task-form select:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 8px rgba(var(--accent-blue), 0.5);
    outline: none;
}

.form-row {
    display: flex;
    flex-wrap: wrap; /* Allow form groups to wrap */
    gap: 15px;
    margin-bottom: 15px;
}

.form-group {
    flex: 1; /* Allow groups to take available space */
    min-width: 150px; /* Minimum width for each group */
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 8px;
    color: var(--text-light);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Button Styling */
button {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

#add-button {
    width: 100%;
    background: var(--button-gradient);
    color: #fff;
    box-shadow: 0 4px 10px rgba(var(--accent-blue), 0.4);
    margin-top: 20px;
}

#add-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(var(--accent-blue), 0.6);
}

/* Filter Controls */
.filter-controls {
    margin-top: 40px;
    padding-top: 25px;
    border-top: 1px solid var(--border-color);
}

.filter-controls h3 {
    margin-bottom: 15px;
    color: var(--text-light);
    font-weight: 600;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-btn {
    background-color: #3a3a3a;
    color: var(--text-light);
    border: 1px solid var(--accent-blue);
    padding: 8px 15px;
    font-size: 0.9rem;
}

.filter-btn:hover {
    background-color: var(--accent-blue);
    color: #fff;
    transform: none; /* Override general button hover */
    box-shadow: none;
}

.filter-btn.active {
    background: var(--button-gradient);
    color: #fff;
    border-color: var(--accent-blue);
    box-shadow: 0 2px 8px rgba(var(--accent-blue), 0.4);
}

/* Task List Container (for scrollability) */
.task-list-container {
    flex-grow: 1; /* Allows it to expand and fill available space */
    overflow-y: auto; /* Enable vertical scrolling */
    padding-right: 5px; /* Space for scrollbar */
}
/* Custom Scrollbar for better aesthetics */
.task-list-container::-webkit-scrollbar {
    width: 8px;
}

.task-list-container::-webkit-scrollbar-track {
    background: var(--bg-dark-secondary);
    border-radius: 10px;
}

.task-list-container::-webkit-scrollbar-thumb {
    background: var(--accent-blue);
    border-radius: 10px;
    border: 2px solid var(--bg-dark-secondary);
}

.task-list-container::-webkit-scrollbar-thumb:hover {
    background: #ab47bc;
}


/* Task Item Styling */
.task-item {
    display: flex;
    align-items: flex-start; /* Align items to the top */
    padding: 18px;
    margin-bottom: 15px;
    background-color: #2c2c2c; /* Darker than card background */
    border-left: 5px solid var(--accent-blue);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
    transition: all 0.3s ease;
    position: relative;
}

.task-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.6);
}

.task-details {
    flex-grow: 1;
    margin-right: 15px;
}

.task-text-display {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text-light);
    margin-bottom: 5px;
}

.task-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    flex-wrap: wrap; /* Allow meta items to wrap */
    gap: 15px; /* Space between meta items */
}

.task-meta span i {
    margin-right: 5px;
    color: var(--accent-blue); /* Icons stand out */
}

.task-list-tag {
    background-color: #8e24aa33; /* Light transparent purple */
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-blue);
}

.task-actions {
    display: flex;
    gap: 8px; /* Space between action buttons */
    align-items: center; /* Vertically align buttons */
    flex-shrink: 0; /* Prevent buttons from shrinking */
}

/* Completed Task Styling */
.completed {
    border-left-color: var(--accent-green); /* Green border for completed tasks */
    opacity: 0.7;
    background-color: #222; /* Slightly different background for completed */
}

.completed .task-text-display {
    text-decoration: line-through;
    color: #888;
}

.completed .task-list-tag {
    background-color: #43a04733;
    color: var(--accent-green);
}

/* Button Colors for Task Actions */
.edit-btn {
    background-color: var(--accent-yellow);
    color: var(--bg-dark-primary);
    box-shadow: 0 2px 5px rgba(var(--accent-yellow), 0.3);
}
.edit-btn:hover {
    background-color: #fbc02d;
    transform: translateY(-1px);
}

.delete-btn {
    background-color: var(--accent-red);
    color: #fff;
    box-shadow: 0 2px 5px rgba(var(--accent-red), 0.3);
}
.delete-btn:hover {
    background-color: #d32f2f;
    transform: translateY(-1px);
}

.complete-btn {
    background-color: var(--accent-green);
    color: #fff;
    box-shadow: 0 2px 5px rgba(var(--accent-green), 0.3);
}
.complete-btn:hover {
    background-color: #388e3c;
    transform: translateY(-1px);
}

/* Edit Mode Styling */
.edit-input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--accent-blue);
    border-radius: 4px;
    background-color: var(--bg-dark-primary);
    color: var(--text-light);
    font-size: 1.15rem;
    margin-bottom: 5px; /* Align with task-text-display */
}

/* Empty List Placeholder */
.empty-message {
    color: var(--text-muted);
    padding: 30px 20px;
    text-align: center;
    font-style: italic;
    font-size: 1.1rem;
    background-color: #2c2c2c;
    border-radius: 8px;
    margin-top: 15px;
}

/* Responsive Adjustments */
@media (max-width: 1200px) {
    .container {
        flex-direction: column; /* Stack columns vertically */
        align-items: center; /* Center them */
    }

    .task-column, .app-center {
        width: 90%; /* Take more width */
        max-width: 600px; /* Limit maximum width */
        margin-bottom: 20px; /* Space between stacked columns */
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    header p {
        font-size: 0.9rem;
    }
    .wrapper {
        padding: 20px 10px;
    }
    .task-column, .app-center {
        width: 100%;
        padding: 15px;
    }
    h2 {
        font-size: 1.4rem;
        margin-bottom: 15px;
    }
    .form-row {
        flex-direction: column;
        gap: 10px;
    }
    .filter-buttons {
        justify-content: center;
    }
    .task-item {
        flex-direction: column;
        align-items: stretch;
    }
    .task-actions {
        margin-top: 15px;
        justify-content: flex-end; /* Align actions to the right when stacked */
    }
    .task-details {
        margin-right: 0;
        margin-bottom: 10px;
    }
}
/* Styling for Overdue Tag */
.overdue-tag {
    font-weight: 600;
    color: var(--accent-red); /* Red color for warning */
    background-color: #e5393520; /* Light red background */
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
}

.overdue-tag i {
    margin-right: 5px;
    color: var(--accent-red);
}

/* Ensure the completed overdue task has muted color */
.completed .overdue-tag {
    color: #888;
    background-color: transparent;
}