:root {
    --accent-color: #007bff;
    --text-color-light: #212529;
    --bg-color-light: #f8f9fa;
    --card-bg-light: #ffffff;
    --text-color-dark: #f8f9fa;
    --bg-color-dark: #212529;
    --card-bg-dark: #343a40;
    --border-color-light: #dee2e6;
    --border-color-dark: #495057;
    --sidebar-width: 280px;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Theme Setup */
body[data-theme='light'] {
    --text-color: var(--text-color-light);
    --bg-color: var(--bg-color-light);
    --card-bg: var(--card-bg-light);
    --border-color: var(--border-color-light);
}

body[data-theme='dark'] {
    --text-color: var(--text-color-dark);
    --bg-color: var(--bg-color-dark);
    --card-bg: var(--card-bg-dark);
    --border-color: var(--border-color-dark);
}

/* Base Styles */
body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.site-container {
    display: flex;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    background-color: var(--card-bg);
    border-right: 1px solid var(--border-color);
    padding: 2rem;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

.site-title a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
    margin-bottom: 2rem;
    display: block;
}

.main-nav {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-grow: 1;
}

.main-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: background-color 0.2s;
}

.main-nav a:hover {
    background-color: var(--accent-color);
    color: #fff;
}

.theme-toggle-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 3rem;
    width: calc(100% - var(--sidebar-width));
    box-sizing: border-box;
}

.content-section {
    margin-bottom: 4rem;
}

.content-section h2 {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
}

/* Blog List */
.post-list .post-preview {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.post-preview h3 a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.5rem;
}

.post-preview .post-meta {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.7;
    margin: 0.25rem 0 1rem 0;
}

/* AI Tools Grid */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.tool-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.tool-card h3 {
    margin-top: 0;
    color: var(--accent-color);
}

.input-container {
    display: flex;
    gap: 0.5rem;
}

input[type="text"] {
    flex-grow: 1;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    background: var(--bg-color);
    color: var(--text-color);
}

.generate-button, button[type="button"] {
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
}

#webcam-container, #food-image-container {
    margin: 1rem auto;
    width: 200px;
    height: 200px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
}

#food-image-container img {
    max-width: 100%;
    max-height: 100%;
    object-fit: cover;
    animation: fadeIn 0.5s ease-in-out;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(128, 128, 128, 0.2);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.prompt-display {
    margin-top: 1rem;
    font-style: italic;
    opacity: 0.8;
}

.prompt-display span {
    font-weight: bold;
}

/* Footer */
.site-footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .site-container {
        flex-direction: column;
    }

    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 2rem;
    }
}