:root {
    --bg-dark: #0b0d10;
    --bg-panel: #14171c;
    --bg-hover: #1e222b;
    --border: #2a2f3a;
    --accent: #f8b700;
    --accent-hover: #ffd100;
    --text-primary: #e0e0e0;
    --text-secondary: #9aa0a8;
    --link: #00d2ff;
    --link-hover: #80e8ff;
    --error: #ff4d4d;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: radial-gradient(circle at top center, #1a1d24 0%, #0b0d10 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.top-bar {
    background: rgba(11, 13, 16, 0.95);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(8px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    text-shadow: 0 0 8px rgba(248, 183, 0, 0.3);
}

.logo img {
    filter: drop-shadow(0 0 4px rgba(248, 183, 0, 0.5));
}

.container {
    max-width: 960px;
    width: 100%;
    margin: 2rem auto;
    padding: 0 1.5rem;
    flex: 1;
}

h1 {
    font-size: 1.75rem;
    margin: 0 0 0.25rem;
    color: var(--accent);
    text-shadow: 0 0 10px rgba(248, 183, 0, 0.2);
}

.subtitle {
    color: var(--text-secondary);
    margin: 0 0 1.5rem;
}

.tree {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.tree ul {
    list-style: none;
    margin: 0;
    padding-left: 1.25rem;
    display: none;
}

.tree ul.open {
    display: block;
}

.tree > ul,
.tree > .node-header + ul {
    display: block;
    padding-left: 0;
}

.tree li {
    margin: 0.25rem 0;
}

.node-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.5rem;
    border-radius: 4px;
    cursor: default;
    flex-wrap: wrap;
}

.dir-header {
    cursor: pointer;
}

.dir-header:hover {
    background: var(--bg-hover);
}

.toggle {
    color: var(--accent);
    font-size: 0.75rem;
    width: 1rem;
    text-align: center;
}

.icon {
    font-size: 1rem;
}

.name {
    color: var(--text-primary);
    font-weight: 500;
}

.file-header .name {
    color: var(--link);
    text-decoration: none;
}

.file-header .name:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.meta {
    width: 100%;
    margin-top: 0.25rem;
    padding-left: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.empty {
    color: var(--text-secondary);
    font-style: italic;
    padding-left: 1.5rem;
}

.loading,
.error {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.error {
    color: var(--error);
}

.footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
    .container {
        margin: 1rem auto;
    }

    .tree {
        padding: 0.75rem;
    }

    .tree ul {
        padding-left: 0.75rem;
    }
}