/* Base Styles */
:root {
    --primary-gradient: linear-gradient(135deg, #ff6b6b, #4ecdc4); /* Warm coral to cool blue gradient */
    --primary-color: #ff6b6b;  /* Warm coral red */
    --primary-light: #4ecdc4;  /* Light blue */
    --accent-color: #ff9a8b;   /* Soft coral accent */
    --text-color: #333333;     /* Dark gray for titles */
    --text-light: #666666;     /* Medium gray for subtitles */
    --bg-color: #f8f8f8;       /* Very light gray background */
    --card-bg: #ffffff;        /* Clean white for cards */
    --border-color: #e0e0e0;   /* Subtle border color */
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.05); /* Soft shadow */
    --success-color: #4ecdc4;  /* Cool blue for success */
    --warning-color: #ffbe76;  /* Warm amber warning */
    --danger-color: #ff6b6b;   /* Coral red for danger */
    --radius: 6px;             /* Slightly smaller radius for minimalism */
    --transition: all 0.2s ease;
}

.dark-theme {
    --primary-gradient: linear-gradient(135deg, #ff8080, #66d9e8); /* Brighter gradient for dark mode */
    --primary-color: #ff8080;   /* Brighter coral for dark mode */
    --primary-light: #66d9e8;   /* Brighter blue for dark mode */
    --accent-color: #ffa69e;    /* Warmer accent for dark mode */
    --text-color: #e0e0e0;      /* Light text for dark mode */
    --text-light: #a0a0a0;      /* Muted text for dark mode */
    --bg-color: #1a1a1a;        /* Softer dark background */
    --card-bg: #242424;         /* Slightly lighter card background */
    --border-color: #3a3a3a;    /* Subtle border for dark mode */
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    --input-bg: #333333;         /* Darker grey for input backgrounds */
}

/* Reset and Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
    padding: 20px;
}

/* App Container */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    border-radius: var(--radius);
}

/* Header Styles */
header {
    margin-bottom: 30px;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.app-header h1 {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-size: 2.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
    transition: var(--transition);
}

.theme-toggle:hover {
    color: var(--primary-color);
}

/* Task Stats */
.task-stats {
    display: flex;
    justify-content: space-between;
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 15px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.stat-item {
    text-align: center;
    flex: 1;
}

.stat-item span {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--primary-color);
    display: block;
}

.stat-item p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Task Form */
.task-form-container {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.form-row {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

#task-input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
}

#task-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

#add-task-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius);
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

#add-task-btn:hover {
    opacity: 0.9;
    transform: scale(1.05);
}

/* Form Fields */
.extra-fields {
    display: flex;
    flex-direction: row;
    gap: 15px;
    justify-content: space-between;
}

.form-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--text-light);
}

select, input[type="date"] {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 0.9rem;
    transition: var(--transition);
}

select:focus, input[type="date"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Task Controls */
.task-controls {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Search Container */
.search-container {
    position: relative;
}

#search-input {
    width: 100%;
    padding: 12px 15px;
    padding-left: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
}

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

/* Filter Container */
.filter-container {
    display: flex;
    flex-direction: row;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: space-between;
}

.filter-container select {
    min-width: 120px;
    flex: 1;
}

/* Clear Completed Button */
#clear-completed-btn {
    background-color: transparent;
    color: var(--text-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 10px 15px;
    cursor: pointer;
    transition: var(--transition);
    align-self: flex-end;
}

#clear-completed-btn:hover {
    color: var(--danger-color);
    border-color: var(--danger-color);
}

/* Tasks Container */
.tasks-container {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    min-height: 200px;
}

.task-list {
    list-style: none;
}

/* Task Item */
.task-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    animation: fadeIn 0.3s ease;
    transition: var(--transition);
}

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

.task-item:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.task-check-title {
    display: flex;
    align-items: center;
    gap: 10px;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.task-text {
    font-size: 1.1rem;
    transition: var(--transition);
}

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

.task-details {
    display: flex;
    gap: 15px;
    font-size: 0.8rem;
    color: var(--text-light);
}

.task-category, .task-priority, .task-due-date {
    display: flex;
    align-items: center;
    gap: 5px;
}

.task-priority.high {
    color: var(--danger-color);
}

.task-priority.medium {
    color: var(--warning-color);
}

.task-priority.low {
    color: var(--success-color);
}

.overdue {
    color: var(--danger-color);
}

/* Task Actions */
.task-actions {
    display: flex;
    gap: 10px;
}

.edit-task-btn, .delete-task-btn {
    background: none;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-light);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.edit-task-btn:hover {
    color: var(--primary-color);
    background-color: rgba(0, 0, 0, 0.05);
}

.delete-task-btn:hover {
    color: var(--danger-color);
    background-color: rgba(0, 0, 0, 0.05);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 30px 0;
    color: var(--text-light);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

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

.modal-content {
    background-color: var(--card-bg);
    margin: 10% auto;
    padding: 25px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 500px;
    animation: fadeIn 0.3s;
}

.close-modal {
    float: right;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

.close-modal:hover {
    color: var(--danger-color);
}

.modal h2 {
    margin-bottom: 20px;
    color: var(--text-color);
}

#save-edit-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius);
    padding: 10px 20px;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    margin-top: 15px;
    font-size: 1rem;
}

#save-edit-btn:hover {
    opacity: 0.9;
}

/* Drag and Drop */
.task-item.dragging {
    opacity: 0.5;
    background-color: var(--border-color);
}

.task-item.drag-over {
    border-top: 2px solid var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-container {
        padding: 10px;
    }
    
    .extra-fields {
        flex-direction: column;
        gap: 10px;
    }
    
    .task-controls {
        gap: 10px;
    }
    
    .filter-container {
        flex-direction: column;
    }
    
    .task-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .task-actions {
        align-self: flex-end;
    }
    
    .modal-content {
        width: 95%;
        margin: 5% auto;
        padding: 15px;
    }
}

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

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

/* Update input styles for dark mode */
.dark-theme input[type="text"],
.dark-theme input[type="date"],
.dark-theme select {
    background-color: var(--input-bg);
    color: var(--text-color);
}

/* Subtasks Styling */
.subtasks-container {
    margin-top: 10px;
    margin-left: 30px;
    display: none;
}

.subtasks-container.show {
    display: block;
}

.subtasks-list {
    list-style: none;
    margin-bottom: 10px;
}

.subtask-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 0;
    border-bottom: 1px dashed var(--border-color);
}

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

.subtask-content {
    display: flex;
    align-items: center;
    gap: 8px;
}

.subtask-checkbox {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.subtask-text {
    font-size: 0.9rem;
}

.delete-subtask-btn {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 2px 5px;
    border-radius: 50%;
}

.delete-subtask-btn:hover {
    color: var(--danger-color);
    background-color: rgba(0, 0, 0, 0.05);
}

.add-subtask {
    display: flex;
    gap: 5px;
    margin-top: 5px;
}

.subtask-input {
    flex: 1;
    padding: 5px 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.9rem;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.dark-theme .subtask-input {
    background-color: var(--input-bg);
}

.add-subtask-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius);
    width: 25px;
    height: 25px;
    font-size: 0.8rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-subtasks-btn {
    background: none;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-light);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.toggle-subtasks-btn:hover {
    color: var(--primary-color);
    background-color: rgba(0, 0, 0, 0.05);
}

/* Edit Subtasks */
.edit-subtasks-list {
    list-style: none;
    margin-bottom: 10px;
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 5px;
}

.edit-add-subtask {
    display: flex;
    gap: 5px;
}

#edit-subtask-input {
    flex: 1;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.9rem;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.dark-theme #edit-subtask-input {
    background-color: var(--input-bg);
}

#edit-add-subtask-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius);
    width: 30px;
    height: 30px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}