:root {
    --primary-color: #4285f4;
    --secondary-color: #f8f9fa;
    --text-color: #333;
    --light-text-color: #6c757d;
    --border-color: #dee2e6;
    --hover-color: #3367d6;
    --bg-color: #f4f7f6;
    --card-bg-color: #fff;
    --input-border-color: #ccc;
    --input-focus-border-color: var(--primary-color);
}

[data-theme="dark"] {
    --primary-color: #8ab4f8;
    --secondary-color: #202124;
    --text-color: #e8eaed;
    --light-text-color: #969ba1;
    --border-color: #5f6368;
    --hover-color: #a6c9fa;
    --bg-color: #121212;
    --card-bg-color: #1e1e1e;
    --input-border-color: #5f6368;
    --input-focus-border-color: var(--primary-color);
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
}

.sidebar {
    width: 250px;
    flex-shrink: 0;
    background: var(--card-bg-color);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    height: 100vh;
    position: sticky;
    top: 0;
}

.sidebar-sticky {
    position: relative;
    top: 0;
    height: 100%;
    overflow-y: auto;
}

.search-box {
    display: flex;
    margin-bottom: 20px;
}

.search-box input {
    flex-grow: 1;
    padding: 8px;
    border: 1px solid var(--input-border-color);
    border-radius: 4px 0 0 4px;
    background-color: var(--card-bg-color);
    color: var(--text-color);
}

.search-box button {
    padding: 8px 12px;
    background-color: var(--primary-color);
    color: #fff;
    border: 1px solid var(--primary-color);
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.search-box button:hover {
    background-color: var(--hover-color);
}

.nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-heading {
    font-size: 1.1em;
    color: var(--light-text-color);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    padding: 0 1em;
}

.nav-link {
    display: block;
    padding: 0.5em 1em;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 5px;
    margin: 2px 0;
}

.nav-link.active {
    background-color: var(--primary-color);
    color: #fff;
    font-weight: 500;
}

.nav-link:hover:not(.active) {
    background-color: var(--secondary-color);
}

.main-content {
    flex-grow: 1;
    padding: 20px;
    background-color: var(--bg-color);
}

.header {
    text-align: center;
    padding-bottom: 5px;
    margin-bottom: 10px;
    position: relative;
}

.header h1 {
    font-size: 1.7em;
    margin-bottom: 6px;
    margin-top: 1px;
}

.header-description {
    font-size: 1.1em;
    color: var(--light-text-color);
}

.theme-switcher {
    position: absolute;
    top: 10px;
    right: 20px;
    cursor: pointer;
}

.tool-category {
    margin-bottom: 40px;
}

.tool-category h2 {
    font-size: 1.8em;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.tool-card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    text-align: left;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

.tool-card h3 {
    margin-top: 0;
    font-size: 1.4em;
}

.tool-card h3 a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
}

.tool-card h3 a:hover {
    color: var(--hover-color);
}

.tool-card p {
    color: var(--light-text-color);
    font-size: 1em;
    line-height: 1.6;
}

/* Individual Tool Page Styles */
.content-area {
    display: flex;
    gap: 40px;
}

.left-panel, .right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.right-panel .card-body .form-group {
    display: flex;
}

.card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 20px;
}

.card-header {
    background-color: var(--secondary-color);
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
}

.card-body {
    padding: 20px;
}

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

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

input[type="text"],
input[type="number"],
input[type="range"],
select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--input-border-color);
    border-radius: 5px;
    background-color: var(--card-bg-color);
    color: var(--text-color);
    box-sizing: border-box;
    transition: border-color 0.2s ease;
    margin: 5px;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="range"]:focus,
select:focus {
    outline: none;
    border-color: var(--input-focus-border-color);
    box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2);
}

input[type="range"] {
    padding: 0;
}

.btn {
    display: inline-block;
    font-weight: 500;
    color: #fff;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    background-color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 5px;
    transition: background-color 0.2s ease;
}

.btn:hover {
    background-color: var(--hover-color);
    border-color: var(--hover-color);
}

.image-drop-area {
    border: 2px dashed var(--border-color);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    border-radius: 5px;
    transition: border-color 0.2s ease;
}

.image-drop-area.highlight {
    border-color: var(--primary-color);
}

/* How-to and FAQ sections */
.how-to-section, .faq-section {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.how-to-section h2, .faq-section h2 {
    color: var(--text-color);
    margin-bottom: 20px;
}

.how-to-section ol {
    list-style-type: none;
    padding-left: 0;
}

.how-to-section li {
    background: var(--secondary-color);
    margin-bottom: 10px;
    padding: 15px;
    border-radius: 5px;
    display: flex;
    align-items: center;
}

.how-to-section ol li strong {
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: inline-block;
    text-align: center;
    line-height: 30px;
    margin-right: 15px;
    flex-shrink: 0;
}

.faq-item {
    margin-bottom: 10px;
}

.faq-question {
    background: var(--secondary-color);
    padding: 15px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 15px;
    display: none;
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 5px 5px;
}

.image-preview img, #canvas {
    max-width: 100%;
}

#download-badges {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    align-items: center;
}

#download-badges .download-icon-dark {
    display: block;
}

#download-badges .download-icon-light {
    display: none;
}

[data-theme="dark"] #download-badges .download-icon-dark {
    display: none;
}

[data-theme="dark"] #download-badges .download-icon-light {
    display: block;
}

#download-badges a {
    text-decoration: none;
    color: #007bff;
    background-color: #f8f9fa;
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid #007bff;
    transition: background-color 0.3s, color 0.3s;
}

#download-badges a:hover {
    background-color: #007bff;
    color: #fff;
}

.hidden {
    display: none!important;
}

.loader {
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    width: 12px;
    height: 12px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-left: 5px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.notification {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #ffc107;
    color: #333;
    padding: 15px;
    border-radius: 5px;
    z-index: 1000;
    display: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}