/* --- Google Font Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* --- 1. Design System & Reset --- */
:root {
    --clr-primary: #2563eb;
    --clr-accent-dark: #1f2937;
    --clr-bg: #f8f9fa;
    --clr-surface: #ffffff;
    --clr-text-primary: #111827;
    --clr-text-secondary: #6b7280;
    --clr-border: #e5e7eb;
    --clr-success: #16a34a;
    --clr-danger: #dc2626;
    --clr-icon: #9ca3af;

    --font-primary: 'Inter', sans-serif;
    --header-height: 60px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --border-radius: 0.5rem;
    --box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

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

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-primary);
    background-color: var(--clr-bg);
    color: var(--clr-text-primary);
    font-size: 16px;
}

ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; width: 100%; }

/* --- 2. Main Layout --- */
.main-header {
    height: var(--header-height);
    background-color: var(--clr-surface);
    border-bottom: 1px solid var(--clr-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    position: fixed;
    top: 0; left: 0; width: 100%; z-index: 1000;
}
.app-container {
    display: grid;
    grid-template-columns: 380px 1fr;
    height: calc(100vh - var(--header-height));
    margin-top: var(--header-height);
}
.sidebar {
    background-color: var(--clr-bg);
    padding: var(--spacing-lg);
    border-right: 1px solid var(--clr-border);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: var(--spacing-lg);
}
.content {
    padding: var(--spacing-lg);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* --- 3. Component Styling --- */
/* Header */
.main-header__logo { display: flex; align-items: center; gap: var(--spacing-sm); font-size: 1.25rem; font-weight: 700; }
.main-header__logo h1 { margin: 0; font-size: inherit; font-weight: inherit; }
.main-header__logo svg { width: 45px; height: 45px; fill: var(--clr-primary); }
.main-header__nav { display: flex; align-items: center; gap: var(--spacing-md); }
.main-header__btn-notifications { font-size: 1.25rem; color: var(--clr-text-secondary); }
.main-header__user-profile img { width: 40px; height: 40px; border-radius: 50%; }

/* Task Form */
.task-form-container { background-color: var(--clr-surface); padding: var(--spacing-lg); border-radius: var(--border-radius); border: 1px solid var(--clr-border); }
.task-form-container__title { font-size: 1.125rem; font-weight: 600; margin-bottom: var(--spacing-lg); }
.form-group { margin-bottom: var(--spacing-md); }
.form-group__label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: var(--spacing-sm); color: var(--clr-text-secondary); }
.form-group__input, .form-group__textarea { width: 100%; padding: var(--spacing-sm) var(--spacing-md); border: 1px solid var(--clr-border); border-radius: var(--border-radius); font-size: 1rem; }
.form-group__input:focus, .form-group__textarea:focus { outline: 2px solid transparent; outline-offset: 2px; border-color: var(--clr-primary); box-shadow: 0 0 0 2px var(--clr-primary); }
.form-group__textarea { min-height: 100px; resize: vertical; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--spacing-sm); padding: var(--spacing-sm) var(--spacing-md); border-radius: var(--border-radius); font-weight: 600; transition: background-color 0.2s ease-in-out; }
.btn--primary { background-color: var(--clr-accent-dark); color: var(--clr-surface); }
.btn--primary:hover { background-color: #374151; }
.btn--full-width { width: 100%; padding: 0.75rem var(--spacing-md); }

/* Stats Panel */
.stats-panel { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-md); background-color: var(--clr-surface); padding: var(--spacing-md); border-radius: var(--border-radius); border: 1px solid var(--clr-border); text-align: center; }
.stats-panel__item { display: flex; flex-direction: column; gap: var(--spacing-xs); }
.stats-panel__value { font-size: 1.5rem; font-weight: 700; color: var(--clr-text-primary); }
.stats-panel__label { font-size: 0.875rem; color: var(--clr-text-secondary); }

/* Filter Controls */
.filter-controls { display: flex; justify-content: space-between; align-items: center; gap: var(--spacing-md); }
.filter-controls__search-container { display: flex; align-items: center; position: relative; flex-grow: 1; }
.filter-controls__search-container i { position: absolute; left: var(--spacing-sm); top: 50%; transform: translateY(-50%); color: var(--clr-icon); }
.filter-controls__search-input { flex-grow: 1; background-color: var(--clr-surface); border: 1px solid var(--clr-border); border-radius: var(--border-radius); padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2rem; font-size: 1rem; }
.filter-controls__search-input:focus { outline: 2px solid transparent; outline-offset: 2px; border-color: var(--clr-primary); box-shadow: 0 0 0 2px var(--clr-primary); }
.filter-controls__buttons { display: flex; background-color: var(--clr-surface); border: 1px solid var(--clr-border); border-radius: var(--border-radius); padding: var(--spacing-xs); }
.filter-btn { padding: 0.5rem 1rem; border-radius: 0.375rem; font-weight: 500; color: var(--clr-text-secondary); transition: all 0.2s ease-in-out; }
.filter-btn:hover { color: var(--clr-text-primary); }
.filter-btn--active { background-color: var(--clr-primary); color: var(--clr-surface); }
.filter-btn--active:hover { color: var(--clr-surface); }

/* --- MODIFIED Task List & Item Styling --- */
.tasks-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.task-item {
    background-color: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--border-radius);
    padding-top: 0.5rem;
    padding-right: 1.5rem;
    padding-bottom: 0.5rem;
    padding-left: 1.5rem;

    box-shadow: var(--box-shadow);
    transition: box-shadow 0.2s ease-in-out;
    /* Main layout change: Use flexbox */
    display: flex;
    align-items: flex-start; /* Aligns checkbox with the top of the content */
    gap: var(--spacing-md);
}

.task-item:hover {
    box-shadow: var(--box-shadow-lg);
}

.task-item__checkbox {
    flex-shrink: 0; /* Prevents checkbox from shrinking */
    margin-top: 0.25rem;
    width: 1.25rem;
    height: 1.25rem;
    accent-color: var(--clr-primary);
}

.task-item__content {
    flex-grow: 1; /* Allows content to take up available space */
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.task-item__title {
    font-weight: 600;
    font-size: 1.125rem; /* 18px */
    color: var(--clr-text-primary);
}

.task-item__description {
    font-size: 0.875rem; /* 14px */
    color: var(--clr-text-secondary);
    line-height: 1.5;
}

/* Style for completed tasks */
.task-item--completed .task-item__title {
    text-decoration: line-through;
    color: var(--clr-text-secondary);
}

.task-item__meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--clr-text-secondary);
}

.task-item__icon {
    width: 1rem; /* 16px */
    height: 1rem; /* 16px */
    color: var(--clr-icon);
}

.task-item__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.task-item__btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
    border-radius: 50%; /* Makes the button circular */
    color: var(--clr-icon);
    transition: all 0.2s ease-in-out;
}

.task-item__btn:hover {
    color: var(--clr-text-primary);
    background-color: var(--clr-border);
}

.task-item__btn--delete:hover {
    color: var(--clr-danger);
    background-color: #fee2e2; /* A light red for the hover background */
}

.task-item__btn-icon {
    width: 1.25rem; /* 20px */
    height: 1.25rem; /* 20px */
}

/* --- 4. Responsive Design --- */
@media (max-width: 768px) {
    html, body { 
        overflow: auto; /* Allows the page to scroll vertically */
    }
    .app-container { 
        grid-template-columns: 1fr; /* Stacks the sidebar and content into a single column */
        height: auto; 
    }
    .sidebar { 
        border-right: none; /* Removes the side border */
        border-bottom: 1px solid var(--clr-border); /* Adds a bottom border to separate sections */
    }
    .content { 
        overflow-y: visible; 
    }
    .filter-controls { 
        flex-direction: column; /* Stacks the search bar and filter buttons */
        align-items: stretch; 
    }
}

/* Dark Mode Theme */
body.dark-mode {
    --clr-bg: #111827;
    --clr-surface: #1f2937;
    --clr-text-primary: #f9fafb;
    --clr-text-secondary: #9ca3af;
    --clr-border: #374151;
    --clr-icon: #9ca3af;
    --clr-primary: #3b82f6;
}

/* Dark mode toggle button (optional styling) */
.dark-toggle {
    font-size: 1rem;
    padding: 0.5rem 1rem;
    margin-left: 1rem;
    border-radius: var(--border-radius);
    background-color: var(--clr-primary);
    color: white;
    transition: background 0.3s ease;
}
.dark-toggle:hover {
    background-color: #2563eb;
}

.task-item__description {
    font-size: 0.875rem; /* 14px */
    color: var(--clr-text-secondary);
    line-height: 1.5;
    /* Add this line to fix the overflow issue */
    word-break: break-word; 
}