* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --bg: #f5f5f5;
    --surface: #ffffff;
    --text: #333333;
    --text-muted: #666666;
    --border: #e0e0e0;
    --success: #4caf50;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

header {
    background: var(--primary);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header .container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.5rem;
}

nav a {
    color: white;
    text-decoration: none;
    margin-left: 1.5rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background 0.2s;
}

nav a:hover {
    background: rgba(255,255,255,0.15);
}

main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.card {
    background: var(--surface);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s;
}

.btn:hover {
    background: var(--primary-dark);
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.release-version {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}

.release-date {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.changelog {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    font-family: monospace;
    white-space: pre-wrap;
    margin: 1rem 0;
}

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0.5rem 0;
}

.tag {
    background: #e3f2fd;
    color: var(--primary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
}

.doc-list {
    list-style: none;
}

.doc-list li {
    margin-bottom: 0.5rem;
}

.doc-list a {
    display: block;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border-radius: 4px;
    text-decoration: none;
    color: var(--text);
    transition: background 0.2s;
}

.doc-list a:hover {
    background: #e3f2fd;
}

.markdown-content h1 { font-size: 1.75rem; margin: 1.5rem 0 1rem; }
.markdown-content h2 { font-size: 1.5rem; margin: 1.25rem 0 0.75rem; }
.markdown-content h3 { font-size: 1.25rem; margin: 1rem 0 0.5rem; }
.markdown-content p { margin: 0.75rem 0; }
.markdown-content ul, .markdown-content ol { margin: 0.75rem 0 0.75rem 1.5rem; }
.markdown-content li { margin: 0.25rem 0; }
.markdown-content code {
    background: #f5f5f5;
    padding: 0.125rem 0.375rem;
    border-radius: 3px;
    font-size: 0.9em;
}
.markdown-content pre {
    background: #263238;
    color: #aed581;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
}
.markdown-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}
.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}
.markdown-content th, .markdown-content td {
    border: 1px solid var(--border);
    padding: 0.5rem;
    text-align: left;
}
.markdown-content th {
    background: #f5f5f5;
}

footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.hero {
    text-align: center;
    padding: 2rem 1rem;
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 1.5rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.feature-item {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
}

.feature-item h3 {
    color: var(--primary);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

table.downloads {
    width: 100%;
    border-collapse: collapse;
}

table.downloads th, table.downloads td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

table.downloads th {
    background: #f5f5f5;
    font-weight: 600;
}

.version-badge {
    display: inline-block;
    background: var(--success);
    color: white;
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-left: 0.5rem;
}

@media (max-width: 600px) {
    header .container {
        flex-direction: column;
        gap: 0.5rem;
    }
    nav a {
        margin: 0 0.5rem;
    }
}

input[type="file"] {
    display: block;
    width: 100%;
    padding: 1rem;
    border: 2px dashed var(--border);
    border-radius: 4px;
    background: #fafafa;
    cursor: pointer;
    margin: 1rem 0;
}

input[type="file"]:hover {
    border-color: var(--primary);
    background: #f0f7ff;
}

#fileInfo {
    margin: 1rem 0;
    padding: 0.75rem;
    background: #f5f5f5;
    border-radius: 4px;
}

#status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 4px;
}

#status.loading {
    background: #fff3e0;
    color: #e65100;
}

#status.success {
    background: #e8f5e9;
    color: #2e7d32;
}

#status.error {
    background: #ffebee;
    color: #c62828;
}

.note {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 1rem;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}