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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #0f1117;
    color: #e1e4e8;
    min-height: 100vh;
}

a { color: #58a6ff; text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* Nav */
nav {
    background: #161b22;
    border-bottom: 1px solid #30363d;
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}
nav .brand { font-weight: 700; font-size: 1.1rem; color: #f0f6fc; }
nav .nav-links { display: flex; gap: 0.5rem; align-items: center; }
nav .nav-link {
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    color: #8b949e;
    transition: background 0.15s;
}
nav .nav-link:hover { background: #21262d; color: #f0f6fc; text-decoration: none; }
nav .nav-link.active { background: #30363d; color: #f0f6fc; }
nav .user-info { display: flex; align-items: center; gap: 1rem; font-size: 0.9rem; }
nav .user-info span { color: #8b949e; }
nav .btn-logout {
    background: #21262d;
    color: #f0f6fc;
    border: 1px solid #30363d;
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
}
nav .btn-logout:hover { background: #30363d; text-decoration: none; }

/* Section header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.2rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.actions { display: flex; gap: 0.5rem; }

/* Buttons */
.btn-action {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #238636;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
}
.btn-action:hover { background: #2ea043; text-decoration: none; }
.btn-action.btn-secondary { background: #21262d; border: 1px solid #30363d; color: #f0f6fc; }
.btn-action.btn-secondary:hover { background: #30363d; }
.btn-small { padding: 0.3rem 0.7rem; font-size: 0.8rem; }

.btn-small.btn-danger {
    background: #3d1f1f;
    color: #f85149;
    border: 1px solid #6e3630;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.8rem;
    padding: 0.3rem 0.7rem;
}
.btn-small.btn-danger:hover { background: #6e3630; }

/* Auth forms */
.auth-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.auth-box {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 2.5rem;
    width: 100%;
    max-width: 400px;
}
.auth-box h1 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    color: #f0f6fc;
}
.auth-box label {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
    color: #8b949e;
}
.auth-box input[type="text"],
.auth-box input[type="password"] {
    width: 100%;
    padding: 0.6rem 0.8rem;
    margin-bottom: 1rem;
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 6px;
    color: #f0f6fc;
    font-size: 1rem;
}
.auth-box input:focus { outline: none; border-color: #58a6ff; }
.btn-primary {
    width: 100%;
    padding: 0.7rem;
    background: #238636;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    font-weight: 600;
}
.btn-primary:hover { background: #2ea043; }

/* Form box */
.form-box {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 2rem;
}
.form-box label {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
    color: #8b949e;
}
.form-box input[type="text"],
.form-box input[type="file"] {
    width: 100%;
    padding: 0.6rem 0.8rem;
    margin-bottom: 1rem;
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 6px;
    color: #f0f6fc;
    font-size: 1rem;
}
.form-box textarea {
    width: 100%;
    padding: 0.8rem;
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 6px;
    color: #f0f6fc;
    font-size: 0.95rem;
    font-family: "SF Mono", "Fira Code", monospace;
    line-height: 1.5;
    resize: vertical;
}
.form-box textarea:focus,
.form-box input:focus { outline: none; border-color: #58a6ff; }

/* Flash messages */
.flash {
    padding: 0.7rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}
.flash.error { background: #3d1f1f; border: 1px solid #6e3630; color: #f85149; }
.flash.success { background: #1f3d1f; border: 1px solid #2ea043; color: #56d364; }

/* File list */
.file-list { list-style: none; }
.file-list li {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 1rem 1.2rem;
    margin-bottom: 0.6rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color 0.15s;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.file-list li:hover { border-color: #58a6ff; }
.file-list .file-info { flex: 1; }
.file-list .file-name { font-weight: 600; }
.file-list .file-actions { display: flex; align-items: center; gap: 0.5rem; }
.file-list .file-version {
    background: #21262d;
    color: #8b949e;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
}

.badge-readonly {
    background: #1f3068;
    color: #79c0ff;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
}

.owner-badge {
    color: #8b949e;
    font-size: 0.85rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.empty-state {
    text-align: center;
    color: #484f58;
    padding: 3rem;
    font-size: 1.1rem;
}

/* Markdown view */
.md-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.md-header h1 { font-size: 1.3rem; }
.md-content {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 2rem;
    line-height: 1.7;
}
.md-content h1, .md-content h2, .md-content h3,
.md-content h4, .md-content h5, .md-content h6 {
    color: #f0f6fc;
    margin: 1.2rem 0 0.6rem;
    border-bottom: 1px solid #21262d;
    padding-bottom: 0.3rem;
}
.md-content h1 { font-size: 1.6rem; }
.md-content h2 { font-size: 1.35rem; }
.md-content p { margin-bottom: 0.8rem; }
.md-content code {
    background: #0d1117;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}
.md-content pre {
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 6px;
    padding: 1rem;
    overflow-x: auto;
    margin-bottom: 1rem;
}
.md-content pre code { background: none; padding: 0; }
.md-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}
.md-content th, .md-content td {
    border: 1px solid #30363d;
    padding: 0.5rem 0.8rem;
    text-align: left;
}
.md-content th { background: #161b22; }
.md-content blockquote {
    border-left: 3px solid #30363d;
    padding-left: 1rem;
    color: #8b949e;
    margin-bottom: 1rem;
}
.md-content ul, .md-content ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.md-content li { margin-bottom: 0.3rem; }
.md-content img { max-width: 100%; border-radius: 6px; }

/* Versions sidebar */
.version-panel {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 1.2rem;
    margin-top: 1.5rem;
}
.version-panel h3 {
    margin-bottom: 0.8rem;
    font-size: 1rem;
    color: #8b949e;
}
.version-list { list-style: none; }
.version-list li {
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    margin-bottom: 0.3rem;
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
}
.version-list li:hover { background: #21262d; }
.version-list li.active { background: #1f3068; border: 1px solid #388bfd; }
.version-list .date { color: #484f58; font-size: 0.8rem; }

/* Diff / Compare */
.diff-container {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 1rem;
    overflow-x: auto;
}
.diff-container table {
    width: 100%;
    border-collapse: collapse;
    font-family: "SF Mono", "Fira Code", monospace;
    font-size: 0.85rem;
}
.diff-container td {
    padding: 0.15rem 0.5rem;
    border: none;
    vertical-align: top;
}
.diff-container .diff_header {
    background: #21262d;
    color: #8b949e;
    font-weight: bold;
}
.diff-container .diff_next { background: #161b22; }
.diff-container .diff_add { background: #1a3a2a; color: #56d364; }
.diff-container .diff_chg { background: #2a2a1a; color: #e3b341; }
.diff-container .diff_sub { background: #3d1f1f; color: #f85149; }

.diff-legend {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.85rem;
}
.diff-legend span {
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
}
.diff-added { background: #1a3a2a; color: #56d364; }
.diff-removed { background: #3d1f1f; color: #f85149; }
.diff-changed { background: #2a2a1a; color: #e3b341; }

h2.page-title { margin-bottom: 1.2rem; }

/* Comparator form */
.compare-form { margin-bottom: 2rem; }
.compare-sides {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    flex-wrap: wrap;
}
.compare-side {
    flex: 1;
    min-width: 280px;
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 1.5rem;
}
.compare-side h3 {
    margin-bottom: 1rem;
    font-size: 1rem;
    color: #f0f6fc;
}
.compare-side label {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.85rem;
    color: #8b949e;
}
.compare-side select {
    width: 100%;
    padding: 0.5rem 0.7rem;
    margin-bottom: 0.8rem;
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 6px;
    color: #f0f6fc;
    font-size: 0.9rem;
    appearance: auto;
}
.compare-side select:focus { outline: none; border-color: #58a6ff; }
.compare-vs {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: #484f58;
    padding-top: 3rem;
}

/* Graph */
#graphCanvas {
    overflow-x: auto;
    margin-top: 1rem;
    padding-bottom: 1rem;
}
#graphCanvas svg { display: block; }
.graph-legend {
    display: flex;
    gap: 1.2rem;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}
.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    color: #e1e4e8;
}
.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--user-color);
}
.legend-info {
    font-size: 0.8rem;
    color: #484f58;
    margin-left: auto;
}