/* Minimal Reset and Semantic Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    background-color: var(--neutral-1);
    color: var(--neutral-1-on);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: var(--size-2) var(--size-4);
    background-color: var(--neutral-2);
    color: var(--neutral-2-on);
    border-bottom: var(--border-width-1) solid var(--neutral-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--size-2);
}

header h1 {
    font-size: var(--size-2);
    margin: 0;
}

header nav a {
    color: var(--primary-8);
    text-decoration: none;
    font-weight: 500;
}

header nav a:hover {
    text-decoration: underline;
}

main {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--size-4);
}

/* Article/Metadata formatting */
article {
    margin-bottom: var(--size-3);
}

article h1, article h2, article h3 {
    color: var(--primary-9);
    margin-bottom: var(--size-1);
}
article>header>h2 {
    margin: 0;
}

article p {
    margin-bottom: var(--size-1);
}

article a {
    color: var(--primary-8);
}

/* Grid Layout */
section ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--size-3);
}

/* File Cards */
section li a {
    display: flex;
    align-items: center;
    gap: var(--size-1);
    background-color: var(--neutral-2);
    color: var(--neutral-2-on);
    padding: var(--size-2);
    text-decoration: none;
    border-radius: var(--border-radius-2);
    border: var(--border-width-2) solid var(--neutral-4);
    transition: background-color 0.2s var(--anim-ease-standard), border-color 0.2s;
    height: 100%;
}

section li a:hover, section li a:focus-visible {
    background-color: var(--primary-2);
    border-color: var(--primary-4);
    color: var(--primary-2-on);
    outline: none;
}

.icon {
    font-size: var(--size-3);
    line-height: 1;
}

.name {
    font-weight: 500;
    word-break: break-word;
}

/* Viewer Styles */
.media-container {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--neutral-2);
    padding: var(--size-3);
    border-radius: var(--border-radius-2);
    border: var(--border-width-1) solid var(--neutral-4);
    margin: var(--size-3) 0;
    width: 100%;
    overflow: hidden;
}

.media-container img, 
.media-container video {
    max-width: 100%;
    height: auto;
    max-height: 75vh;
    border-radius: var(--border-radius-1);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.media-container iframe {
    width: 100%;
    height: 80vh;
    border: none;
    border-radius: var(--border-radius-1);
    background: white; /* PDF viewers usually need white bg */
}

.unsupported-media {
    text-align: center;
    padding: var(--size-5);
}

.button {
    display: inline-block;
    padding: var(--size-1) var(--size-2);
    background-color: var(--primary-6);
    color: var(--primary-6-on);
    text-decoration: none;
    border-radius: var(--border-radius-1);
    font-weight: bold;
    transition: filter 0.2s;
    border: none;
    cursor: pointer;
}

.button:hover {
    filter: brightness(1.1);
}

.file-details {
    text-align: center;
}

/* Footer */
footer {
    text-align: center;
    padding: var(--size-4);
    color: var(--neutral-6);
    font-size: var(--size-0);
    border-top: var(--border-width-1) solid var(--neutral-3);
    margin-top: auto;
}

a {
    color: var(--neutral-6);
}