/* Basic Resets & Variables */
:root {
    --light-bg: #f4f7f6;
    --light-text: #333;
    --light-card-bg: #ffffff;
    --light-border: #e0e0e0;
    --light-shadow: rgba(0, 0, 0, 0.08);
    --light-primary: #4CAF50; /* Green for primary actions */
    --light-secondary: #2196F3; /* Blue for secondary actions */
    --light-accent: #FFC107; /* Amber for highlights */

    --dark-bg: #1a1a2e;
    --dark-text: #e0e0e0;
    --dark-card-bg: #2b2b4d;
    --dark-border: #3a3a5e;
    --dark-shadow: rgba(0, 0, 0, 0.3);
    --dark-primary: #66BB6A; /* Lighter Green */
    --dark-secondary: #64B5F6; /* Lighter Blue */
    --dark-accent: #FFD54F; /* Lighter Amber */

    --priority-low-bg: #8BC34A; /* Light Green */
    --priority-low-text: #2e7d32;
    --priority-medium-bg: #FFC107; /* Amber */
    --priority-medium-text: #ff8f00;
    --priority-high-bg: #EF5350; /* Red */
    --priority-high-text: #c62828;

    --transition-speed: 0.3s ease;
}

[data-theme="light"] {
    --bg-color: var(--light-bg);
    --text-color: var(--light-text);
    --card-bg-color: var(--light-card-bg);
    --border-color: var(--light-border);
    --shadow-color: var(--light-shadow);
    --primary-color: var(--light-primary);
    --secondary-color: var(--light-secondary);
    --accent-color: var(--light-accent);
}

[data-theme="dark"] {
    --bg-color: var(--dark-bg);
    --text-color: var(--dark-text);
    --card-bg-color: var(--dark-card-bg);
    --border-color: var(--dark-border);
    --shadow-color: var(--dark-shadow);
    --primary-color: var(--dark-primary);
    --secondary-color: var(--dark-secondary);
    --accent-color: var(--dark-accent);
}

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

body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
}

/* Header */
header {
    background-color: var(--card-bg-color);
    color: var(--text-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    z-index: 1000;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

header h1 i {
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: 1rem;
}

#theme-toggle, #user-settings {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--transition-speed);
}

#theme-toggle:hover, #user-settings:hover {
    color: var(--primary-color);
}

/* Main Layout */
.container {
    display: grid;
    grid-template-columns: 1fr; /* Default for mobile */
    gap: 1.5rem;
    padding: 1.5rem;
    flex-grow: 1;
}

@media (min-width: 768px) {
    .container {
        grid-template-columns: 1fr 2fr; /* Sidebar and main content */
    }
}

/* Sidebar (Add Task Form) */
.sidebar {
    background-color: var(--card-bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--shadow-color);
    height: fit-content; /* Adjust based on content */
}

.planner-form-container h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: var(--text-color);
    font-size: 0.95rem;
}

.form-group input[type="text"],
.form-group input[type="date"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-color); /* Lighter background for inputs */
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}

.form-group input[type="text"]:focus,
.form-group input[type="date"]:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(var(--primary-color-rgb, 76, 175, 80), 0.2);
}

.form-group textarea {
    resize: vertical;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform 0.1s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

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

.primary-btn:hover {
    background-color: color-mix(in srgb, var(--primary-color) 85%, black);
}

/* Main Content Area */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.card {
    background-color: var(--card-bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--shadow-color);
}

.task-list-container h2, .summary-overview-container h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.filter-sort-bar {
    display: flex;
    flex-wrap: wrap; /* Allow wrapping on smaller screens */
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filter-btn {
    background-color: var(--bg-color); /* Match input background */
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed);
}

.filter-btn:hover {
    background-color: color-mix(in srgb, var(--bg-color) 85%, var(--text-color));
    border-color: var(--primary-color);
}

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

.filter-btn.active:hover {
    background-color: color-mix(in srgb, var(--primary-color) 85%, black);
    color: white;
}

.sort-options label {
    font-weight: bold;
    margin-right: 0.5rem;
}

.sort-options select {
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}
.sort-options select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(var(--primary-color-rgb, 76, 175, 80), 0.2);
}


.search-bar {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-bar input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.8rem; /* Left padding for icon */
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
}

.search-bar i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-color);
}

/* Task List */
#task-list {
    list-style: none;
    padding: 0;
}

.task-item {
    display: flex;
    align-items: center;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 1rem;
    margin-bottom: 0.8rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--shadow-color);
    transition: transform 0.1s ease, box-shadow 0.1s ease, background-color var(--transition-speed);
}

.task-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.task-checkbox {
    margin-right: 1rem;
    width: 20px;
    height: 20px;
    min-width: 20px; /* Prevent shrinking */
    accent-color: var(--primary-color); /* Colors the checkbox itself */
    cursor: pointer;
}

.task-details {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    margin-right: 1rem;
}

.task-details p {
    font-weight: bold;
    margin-bottom: 0.3rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    flex-wrap: wrap; /* Allow subject and tag to wrap */
    gap: 0.5rem;
}

.task-details span {
    font-size: 0.85rem;
    color: var(--text-color); /* Could be slightly lighter */
    display: block;
}

.task-item.completed .task-details p {
    text-decoration: line-through;
    color: #888; /* Lighter color for completed tasks */
}

.task-item.completed .task-details span {
    text-decoration: line-through;
    color: #888;
}

.priority-tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: capitalize;
}

.priority-tag.low {
    background-color: var(--priority-low-bg);
    color: var(--priority-low-text);
}
.priority-tag.medium {
    background-color: var(--priority-medium-bg);
    color: var(--priority-medium-text);
}
.priority-tag.high {
    background-color: var(--priority-high-bg);
    color: var(--priority-high-text);
}

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

.task-actions button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.1rem;
    cursor: pointer;
    transition: color var(--transition-speed), transform 0.1s ease;
}

.task-actions button:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}

.delete-btn:hover {
    color: #ef5350; /* Red for delete */
}

/* Empty Task List Message */
#task-list .task-item[style*="justify-content: center"] {
    background: none;
    border: none;
    box-shadow: none;
    font-style: italic;
    color: var(--text-color);
    opacity: 0.7;
    padding: 2rem;
}


/* Summary & Overview */
.summary-overview-container {
    padding: 1.5rem;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.summary-card {
    background-color: var(--bg-color); /* Lighter background for nested cards */
    padding: 1.2rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px var(--shadow-color);
}

.summary-card h3 {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.summary-card ul {
    list-style: none;
    padding: 0;
}

.summary-card ul li {
    font-size: 0.9rem;
    padding: 0.3rem 0;
    border-bottom: 1px dashed var(--border-color);
}

.summary-card ul li:last-child {
    border-bottom: none;
}

.summary-card p {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.summary-card span {
    font-weight: bold;
    color: var(--primary-color);
}

#todays-focus {
    font-style: italic;
}


/* Responsive adjustments */
@media (max-width: 767px) {
    header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    header h1 {
        font-size: 1.5rem;
    }
    .filter-sort-bar {
        flex-direction: column;
        align-items: flex-start;
    }
    .filter-buttons {
        width: 100%;
        justify-content: center;
    }
    .sort-options {
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .task-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.8rem;
    }
    .task-checkbox {
        margin-right: 0;
    }
    .task-details {
        width: 100%;
        margin-right: 0;
    }
    .task-actions {
        width: 100%;
        justify-content: flex-end; /* Align buttons to the right */
    }
}


/* Add to your existing style.css */

.form-actions {
    margin-top: 1rem; /* Space between buttons */
}

.secondary-btn {
    background-color: var(--secondary-color);
    color: white;
    margin-left: 0.5rem; /* Space from primary button */
}

.secondary-btn:hover {
    background-color: color-mix(in srgb, var(--secondary-color) 85%, black);
}

/* For Summary section */
.summary-card ul li .upcoming-date {
    font-weight: normal;
    font-style: italic;
    color: var(--secondary-color);
}
.summary-card ul li .upcoming-date.overdue-date {
    color: var(--priority-high-bg); /* Red for overdue */
    font-weight: bold;
}
.summary-card #todays-focus .focus-item {
    font-weight: bold;
    color: var(--priority-high-text); /* Highlight high priority items */
}