/* Header */
.site-header {
    background-color: var(--color-bg-body);
    /* Seamless header matching body in dark mode, or use bg-white for contrast */
    height: var(--header-height);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-main);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-nav a {
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-left: var(--spacing-lg);
}

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

/* Breadcrumbs */
.breadcrumbs {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.breadcrumbs a {
    color: var(--color-text-secondary);
    text-decoration: none;
}

.breadcrumbs a:hover {
    color: var(--color-primary);
}

.breadcrumbs .separator {
    margin: 0 var(--spacing-xs);
    color: var(--color-text-light);
}

/* Collection / List Page */
.collection-header {
    background-color: var(--color-bg-body);
    /* Blend with background for cleaner dark look */
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-xl);
    /* border-bottom: 1px solid var(--color-border); */
    /* Optional in dark mode */
    text-align: center;
}

.collection-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-main);
}

.collection-description {
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Search Input */
.search-container {
    position: relative;
}

.search-container input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    /* Left padding for icon */
    background-color: var(--color-bg-body);
    /* Dark background */
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    color: var(--color-text-main);
    /* White text */
    font-size: 1rem;
    transition: var(--transition-base);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23888888'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z' /%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: 1rem center;
    background-size: 1.25rem;
}

.search-container input:focus {
    outline: none;
    border-color: var(--color-text-secondary);
    background-color: var(--color-bg-white);
}

.search-container input::placeholder {
    color: var(--color-text-secondary);
}

.article-list {
    display: grid;
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.article-card {
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
    display: block;
    text-decoration: none !important;
}

.article-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-text-secondary);
    /* Lighter border on hover */
}

.article-card h3 {
    color: var(--color-text-main);
    /* Changed from primary for cleaner look, or keep primary */
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-lg);
}

.article-card:hover h3 {
    color: var(--color-primary);
}

.article-card p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
    font-size: var(--font-size-sm);
}

/* Article Page */
.article-container {
    background-color: var(--color-bg-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    max-width: 900px;
    margin: 0 auto;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

.article-body {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
}

.article-body h2 {
    margin-top: var(--spacing-xl);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-main);
}

.article-body strong {
    color: var(--color-text-main);
}

.article-body ol,
.article-body ul {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.article-body li {
    margin-bottom: var(--spacing-xs);
}

.callout {
    background-color: rgba(0, 106, 255, 0.1);
    /* Transparent primary */
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-main);
}

.article-img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: var(--spacing-lg) auto;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.app-logo {
    max-width: 200px;
    width: 100%;
}

/* Footer */
.site-footer {
    background-color: var(--color-bg-white);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    margin-top: auto;
    text-align: center;
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

/* Mobile */
@media (max-width: 768px) {
    .article-container {
        padding: var(--spacing-lg);
    }

    .collection-title {
        font-size: 2rem;
    }
}