/* Theme Variables */
:root {
    /* Base Colors */
    --primary-color: #007bff; /* Blue */
    --primary-hover-color: #0056b3;
    --secondary-color: #6c757d; /* Gray */
    --success-color: #28a745; /* Green */
    --success-hover-color: #218838;
    --danger-color: #dc3545; /* Red */
    --danger-hover-color: #c82333;
    --warning-color: #ffc107; /* Yellow */
    --info-color: #17a2b8; /* Cyan */

    /* Backgrounds */
    --bg-color: #f8f9fa; /* Light background */
    --main-content-bg: #ffffff;
    --header-bg: #343a40; /* Dark header */
    --footer-bg: #343a40; /* Dark footer */
    --sidebar-bg: #e9ecef; /* Light sidebar */
    --category-bg: #dee2e6; /* Category header background */
    --category-hover-bg: #ced4da;
    --submenu-bg: #f1f3f5; /* Submenu background */
    --hover-bg: #e2e6ea; /* General hover background */
    --tool-card-bg: #ffffff; /* Tool card background */
    --button-bg: #f0f0f0; /* Default button background */
    --button-hover-bg: #e0e0e0;

    /* Text Colors */
    --text-color: #343a40; /* Dark text */
    --text-color-light: #6c757d; /* Lighter text for secondary info */
    --header-text: #ffffff;
    --footer-text: #ffffff;
    --category-text: #343a40;
    --button-text: #343a40;

    /* Borders & Shadows */
    --border-color: #ced4da;
    --header-border: #007bff;
    --sidebar-border: #ced4da;
    --border-radius: 0.25rem; /* Standard border-radius */
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075); /* Standard box shadow */
    --tool-card-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1); /* Tool card shadow */

    /* Input & Search */
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --search-button-bg: var(--primary-color);
    --search-button-text: #ffffff;
    --search-button-hover-bg: var(--primary-hover-color);
}

.dark-theme {
    /* Base Colors */
    --primary-color: #61afef; /* Light Blue */
    --primary-hover-color: #528bff;
    --secondary-color: #9da5b4;
    --success-color: #98c379;
    --success-hover-color: #82b366;
    --danger-color: #e06c75;
    --danger-hover-color: #d45d68;
    --warning-color: #e5c07b;
    --info-color: #56b6c2;

    /* Backgrounds */
    --bg-color: #282c34; /* Dark background */
    --main-content-bg: #21252b;
    --header-bg: #1c1f24;
    --footer-bg: #1c1f24;
    --sidebar-bg: #2c303a;
    --category-bg: #3a3f4b;
    --category-hover-bg: #4a4f5a;
    --submenu-bg: #31353f;
    --hover-bg: #3a3f4b;
    --tool-card-bg: #2c303a;
    --button-bg: #3a3f4b;
    --button-hover-bg: #4a4f5a;

    /* Text Colors */
    --text-color: #abb2bf;
    --text-color-light: #8a929e;
    --header-text: #e0e0e0;
    --footer-text: #e0e0e0;
    --category-text: #e0e0e0;
    --button-text: #abb2bf;

    /* Borders & Shadows */
    --border-color: #4a4f5a;
    --header-border: #61afef;
    --sidebar-border: #4a4f5a;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.2);
    --tool-card-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.2);

    /* Input & Search */
    --input-bg: #31353f;
    --input-border: #4a4f5a;
    --search-button-bg: var(--primary-color);
    --search-button-text: #282c34;
    --search-button-hover-bg: var(--primary-hover-color);
}

/* Global Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease; /* Smooth theme transition */
}

a {
    color: var(--primary-color); /* Use primary color for links */
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-hover-color);
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Header Styles */
#main-header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 0.75rem 20px; /* Adjusted padding */
    border-bottom: var(--header-border) 3px solid;
    box-shadow: var(--box-shadow); /* Add shadow to header */
}

#main-header .logo-placeholder {
    width: 121px;
    height: 75px;
    background-color: var(--sidebar-bg); /* Using sidebar-bg for a neutral placeholder */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--sidebar-text);
    border: 1px solid var(--sidebar-border);
    border-radius: var(--border-radius); /* Apply border-radius */
}

#main-header .main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

#main-header .main-nav ul li {
    margin-left: 25px; /* Increased spacing */
}

#main-header .main-nav ul li a {
    color: var(--header-text);
    font-weight: bold;
    padding: 5px 0; /* Add padding for better click area */
    position: relative;
}

#main-header .main-nav ul li a::after { /* Underline effect */
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -3px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease-out;
}

#main-header .main-nav ul li a:hover::after {
    width: 100%;
}

#main-header .search-box input[type="search"] {
    padding: 10px; /* Increased padding */
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius);
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color 0.2s ease;
}

#main-header .search-box input[type="search"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

#main-header .search-box button {
    padding: 10px 15px; /* Increased padding */
    background-color: var(--search-button-bg);
    color: var(--search-button-text);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    margin-left: 8px; /* Increased margin */
    transition: background-color 0.2s ease, transform 0.1s ease;
}

#main-header .search-box button:hover {
    background-color: var(--search-button-hover-bg);
    transform: translateY(-1px);
}

/* Main Content Area Styles */
.main-container {
    /* Layout handled by layout.css */
    padding: 20px;
}

#left-sidebar {
    background-color: var(--sidebar-bg);
    padding: 15px; /* This is overall padding for the sidebar block */
    border-right: 1px solid var(--sidebar-border);
    box-shadow: none; /* Removed shadow from sidebar */
}

#left-sidebar h2 { /* Specific styling for the sidebar title */
    font-size: 1.1em;
    color: var(--text-color);
    padding: 0 10px 8px 10px;
    margin: -5px -5px 10px -5px;
    border-bottom: 1px solid var(--sidebar-border);
    text-align: center;
    background-color: var(--sidebar-bg); /* Use sidebar background */
    border-top-left-radius: var(--border-radius);
    border-top-right-radius: var(--border-radius);
}

/* Sidebar Navigation Styles - mostly in layout.css now */
#left-sidebar .channel-nav ul {
    /* Handled in layout.css */
}

#left-sidebar .channel-nav ul li {
    /* Handled in layout.css */
}

#left-sidebar .channel-nav ul li span { /* Style for category titles - now replaced by .category-toggle */
    display: none; /* Hide old span titles */
}

#left-sidebar .channel-nav li a {
    /* Handled in layout.css */
}

#left-sidebar .channel-nav li a:hover {
    /* Handled in layout.css */
}

/* Style for active link - handled in layout.css */
#left-sidebar .channel-nav li a.active {
    /* Handled in layout.css */
}

/* Remove submenu specific styles as they will be direct links */
#left-sidebar .channel-nav .sub-channel-nav {
    /* Handled in layout.css */
}

#left-sidebar .channel-nav .sub-channel-nav li a {
    /* Handled in layout.css */
}

/* Remove arrow indicators as there are no submenus */
#left-sidebar .channel-nav li.has-submenu > a {
    /* Handled in layout.css */
}


#main-content {
    padding: 20px; /* Increased padding */
    background-color: var(--main-content-bg);
    border-radius: var(--border-radius); /* Apply border-radius */
    box-shadow: none; /* Removed shadow from main content */
}

#main-content h1, #main-content h2 {
    color: var(--text-color);
    margin-bottom: 20px; /* More space below headings */
}

/* Homepage All Tools List Styles */
.all-tools-list h2 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color); /* Use theme variable */
    padding-bottom: 5px;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.tool-card {
    display: flex; /* Use flexbox for content alignment */
    flex-direction: column;
    justify-content: space-between; /* Push content to top and bottom */
    background-color: var(--tool-card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem; /* Slightly larger border-radius for cards */
    padding: 25px; /* Increased padding */
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05); /* Reintroduced soft shadow */
    text-decoration: none;
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out, border-color 0.3s ease, background-color 0.3s ease;
    position: relative; /* For potential future icons/badges */
    overflow: hidden; /* Ensures content stays within rounded corners */
}

.tool-card:hover {
    transform: translateY(-8px); /* More pronounced lift effect */
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15); /* Stronger shadow on hover */
    border-color: var(--primary-color); /* Highlight border on hover */
    background-color: var(--hover-bg); /* Subtle background change on hover */
}

.tool-card h3 {
    margin-top: 0;
    color: var(--primary-color);
    font-size: 1.4em; /* Larger font for titles */
    margin-bottom: 12px; /* More space below title */
    line-height: 1.3;
}

.tool-card p {
    font-size: 1em; /* Slightly larger font for description */
    color: var(--text-color-light);
    margin-bottom: 0;
    flex-grow: 1; /* Allows description to take available space */
}

/* Footer Styles */
#main-footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 1.2rem 0; /* Increased padding */
    margin-top: auto;
    box-shadow: var(--box-shadow); /* Add shadow to footer */
}

#main-footer p {
    margin: 0;
}

/* Utility Classes (Optional) */
.container { /* A general container for centering content if needed */
    width: 80%;
    margin: auto;
    overflow: hidden;
}

/* Global Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: none; /* Remove underline on hover for all links */
}

img {
    max-width: 100%;
    height: auto;
}

/* Header Styles */
#main-header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 0.5rem 20px; /* Consistent horizontal padding with .main-container, reduced height */
    border-bottom: var(--header-border) 3px solid;
}

#main-header .logo-placeholder {
    /* Styles for CSS-simulated logo if an image isn't used */
    width: 121px;
    height: 75px;
    background-color: var(--sidebar-bg); /* Using sidebar-bg for a neutral placeholder */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--sidebar-text);
    border: 1px solid var(--sidebar-border);
}

#main-header .main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

#main-header .main-nav ul li {
    margin-left: 20px;
}

#main-header .main-nav ul li a {
    color: var(--header-text);
    font-weight: bold;
}

#main-header .search-box input[type="search"] {
    padding: 8px;
    border: 1px solid var(--search-input-border);
    border-radius: 4px;
    background-color: var(--main-content-bg); /* Use main content background for input */
    color: var(--main-content-text); /* Use main content text for input */
}

#main-header .search-box button {
    padding: 8px 12px;
    background-color: var(--search-button-bg);
    color: var(--search-button-text);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 5px;
}

#main-header .search-box button:hover {
    background-color: var(--search-button-hover-bg);
}

/* Main Content Area Styles */
.main-container {
    /* Layout handled by layout.css */
    padding: 20px;
}

#left-sidebar {
    background-color: var(--sidebar-bg);
    padding: 15px; /* This is overall padding for the sidebar block */
    border-right: 1px solid var(--sidebar-border);
}

#left-sidebar h2 { /* Specific styling for the sidebar title */
    font-size: 1.1em; /* Adjusted for 170px sidebar width */
    color: var(--sidebar-title-text);
    padding: 0 10px 8px 10px; /* Padding for the title itself, less than the block padding */
    margin: -5px -5px 10px -5px; /* Adjust margin to use available space, counteracting some parent padding */
    border-bottom: 1px solid var(--sidebar-border);
    text-align: center;
    background-color: var(--sidebar-title-bg); /* Match a common header/title background if desired */
    border-top-left-radius: 4px; /* Optional: if sidebar has rounded corners */
    border-top-right-radius: 4px; /* Optional: if sidebar has rounded corners */
}

/* Sidebar Navigation Styles */
#left-sidebar .channel-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#left-sidebar .channel-nav ul li {
    margin-bottom: 5px; /* Add some space between list items */
    background-color: var(--sidebar-bg); /* Ensure background for shadow */
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1); /* Subtle shadow for each item */
    transition: box-shadow 0.2s ease-in-out;
}

#left-sidebar .channel-nav ul li:hover {
    box-shadow: 0 2px 6px rgba(0,0,0,0.15); /* Slightly more pronounced shadow on hover */
}

#left-sidebar .channel-nav ul li span { /* Style for category titles */
    display: block;
    padding: 8px 10px;
    font-weight: bold;
    color: var(--sidebar-title-text);
    background-color: var(--sidebar-title-bg);
    border-radius: 4px 4px 0 0; /* Rounded top corners */
    margin-bottom: 0; /* Remove margin from span */
    box-shadow: 0 1px 2px rgba(0,0,0,0.08); /* Subtle shadow for category title */
}

#left-sidebar .channel-nav li a {
    display: block;
    padding: 8px 10px;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 3px;
    position: relative; /* For arrow positioning */
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}

#left-sidebar .channel-nav li a:hover {
    background-color: var(--sidebar-link-hover-bg); /* Use defined hover background */
    color: var(--sidebar-link-hover-text); /* Use defined hover text color */
}

/* Style for active link - keep it distinct */
#left-sidebar .channel-nav li a.active {
    font-weight: bold;
    color: var(--link-color); /* Use a distinct color for active link */
    background-color: var(--sidebar-active-category-bg); /* Use defined active background */
    color: var(--sidebar-active-category-text); /* Use defined active text color */
    box-shadow: 0 2px 5px rgba(0,0,0,0.2); /* Keep shadow for active */
}

/* Remove submenu specific styles as they will be direct links */
#left-sidebar .channel-nav .sub-channel-nav {
    list-style: none;
    padding: 0; /* Remove indent */
    margin: 0; /* Remove margin */
    display: block; /* Always visible */
}

#left-sidebar .channel-nav .sub-channel-nav li a {
    padding: 8px 10px; /* Revert to main link padding */
    font-size: 1em; /* Revert to main link font size */
    margin-bottom: 3px; /* Revert to main link margin */
}

/* Remove arrow indicators as there are no submenus */
#left-sidebar .channel-nav li.has-submenu > a {
    padding-right: 10px; /* Remove extra padding for arrow */
}


#main-content {
    padding: 15px;
    background-color: var(--main-content-bg);
}

#main-content h1, #main-content h2 {
    color: var(--main-content-text);
}

/* Homepage All Tools List Styles */
.all-tools-list h2 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--main-content-text);
    border-bottom: 1px solid var(--sidebar-border);
    padding-bottom: 5px;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.tool-card {
    display: block;
    background-color: var(--tool-category-bg);
    border: 1px solid var(--tool-category-border);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 8px var(--tool-category-shadow);
    text-decoration: none;
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px var(--tool-category-shadow);
}

.tool-card h3 {
    margin-top: 0;
    color: var(--tool-category-title-color);
    font-size: 1.2em;
    margin-bottom: 10px;
}

.tool-card p {
    font-size: 0.9em;
    color: var(--tool-category-text-color);
    margin-bottom: 0;
}

/* Footer Styles */
#main-footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 1rem 0;
    margin-top: auto; /* Pushes footer to bottom in flex column layout */
}

#main-footer p {
    margin: 0;
}

/* Utility Classes (Optional) */
.container { /* A general container for centering content if needed */
    width: 80%;
    margin: auto;
    overflow: hidden;
}