/* ===== VARIABLES ===== */
:root {
    --black:      #111;
    --white:      #fff;
    --bg:         #f5f5f5;
    --text:       #222;
    --muted:      #888;
    --accent:     #2563eb;
    --accent-light: #3b82f6;
    --border:     #ddd;
    --sidebar-w:  200px;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

a { color: var(--black); text-decoration: none; font-weight: 500; }
a:hover { color: var(--accent); }
h1, h2, h3 { color: var(--black); font-weight: 700; }

/* ===== LAYOUT ===== */
.layout { display: flex; min-height: 100vh; }

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-w);
    flex-shrink: 0;
    background: var(--black);
    border-right: 3px solid var(--accent);
    padding: 1.2rem 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    overflow-y: auto;
}

.sidebar-header {
    display: flex;
    align-items: center;
    padding: 0 1rem 1rem;
    border-bottom: 1px solid #333;
    margin-bottom: 0.5rem;
}

.logo {
    display: block;
    color: #fff !important;
    font-weight: 700;
    font-size: 1.05rem;
}

.sidebar-body { flex: 1; display: flex; flex-direction: column; }

.sidebar nav ul { list-style: none; padding: 0.5rem 0; }
.sidebar nav li a {
    display: block;
    padding: 0.4rem 1.2rem;
    color: #ccc;
    font-size: 0.9rem;
    transition: color 0.15s;
}
.sidebar nav li a:hover { color: #fff; background: rgba(255,255,255,0.05); }

.sidebar-bottom {
    margin-top: auto;
    padding: 1rem 1.2rem;
    border-top: 1px solid #333;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}
.sidebar-bottom a { color: #aaa; font-size: 0.85rem; }
.sidebar-bottom a:hover { color: #fff; }
.sidebar-admin-title { color: var(--accent-light); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 0.2rem; }

/* ===== HAMBURGER ===== */
header {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 48px;
    background: var(--black);
    z-index: 100;
    padding: 0 1rem;
    align-items: center;
    justify-content: space-between;
}
header a { color: #fff !important; font-weight: 700; }

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 32px;
    height: 32px;
    cursor: pointer;
    padding: 4px;
}
.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: #ccc;
    border-radius: 1px;
}

/* ===== CONTENT ===== */
.content {
    margin-left: var(--sidebar-w);
    flex: 1;
    display: flex;
    flex-direction: column;
}

main { padding: 2rem; flex: 1; max-width: 900px; }

footer {
    padding: 1rem 2rem;
    color: var(--muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

/* ===== ARTICLE LIST ===== */
.article-list article {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}
.article-list h2 { font-size: 1.2rem; margin-bottom: 0.2rem; }
.meta { color: var(--muted); font-size: 0.85rem; }

/* ===== ARTICLE DETAIL ===== */
.article-detail h1 { margin-bottom: 0.3rem; }
.article-body { margin-top: 1.5rem; }
.article-body h2 { margin: 1.5rem 0 0.5rem; }
.article-body h3 { margin: 1rem 0 0.3rem; }
.article-body p { margin: 0.5rem 0; }
.article-body ul, .article-body ol { margin: 0.5rem 0 0.5rem 1.5rem; }
.article-body pre { background: #f0f0f0; padding: 1rem; border-radius: 4px; overflow-x: auto; }
.article-body code { background: #f0f0f0; padding: 0.15rem 0.3rem; border-radius: 3px; font-size: 0.9em; }
.article-body pre code { background: none; padding: 0; }
.article-body table { border-collapse: collapse; width: 100%; margin: 1rem 0; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 0.4rem 0.8rem; text-align: left; }
.article-body th { background: #f0f0f0; }
.article-body blockquote { border-left: 3px solid var(--accent); padding-left: 1rem; color: var(--muted); margin: 1rem 0; }

/* ===== TAGS ===== */
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.5rem 0 1rem; }
.tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: #e5e7eb;
    border-radius: 3px;
    font-size: 0.8rem;
    color: var(--text);
}
.tag:hover, .tag.active { background: var(--accent); color: #fff; }

/* ===== IMAGES ===== */
.article-image { margin: 1.5rem 0; }
.article-image img { max-width: 100%; border-radius: 4px; }
.article-image figcaption { font-size: 0.85rem; color: var(--muted); margin-top: 0.3rem; }

/* ===== GALLERY ===== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.5rem;
    margin: 1rem 0;
}
.gallery-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
.gallery-item img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 4px; }
.gallery-item span { font-size: 0.8rem; color: var(--muted); margin-top: 0.2rem; }

/* ===== LOGIN ===== */
.login-box {
    max-width: 360px;
    margin: 10vh auto;
    padding: 2rem;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
}
.login-box h1 { text-align: center; margin-bottom: 1.5rem; }
.login-box label { display: block; margin-top: 0.8rem; font-size: 0.9rem; font-weight: 500; }
.login-box input { width: 100%; padding: 0.5rem; margin-top: 0.3rem; border: 1px solid var(--border); border-radius: 4px; }
.login-box button { width: 100%; margin-top: 1.2rem; padding: 0.6rem; background: var(--accent); color: #fff; border: none; border-radius: 4px; font-size: 1rem; cursor: pointer; }
.login-box button:hover { background: var(--accent-light); }
.login-error { color: #dc2626; text-align: center; margin-bottom: 0.5rem; }

/* ===== ADMIN ===== */
.admin-dashboard h1 { margin-bottom: 1rem; }
.admin-dashboard table { width: 100%; border-collapse: collapse; }
.admin-dashboard th, .admin-dashboard td { padding: 0.5rem 0.8rem; text-align: left; border-bottom: 1px solid var(--border); }
.admin-dashboard th { font-size: 0.85rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; }

.admin-form { max-width: 800px; }
.admin-form h1 { margin-bottom: 1rem; }
.admin-form h2 { margin: 2rem 0 0.5rem; }
.admin-form label { display: block; margin-top: 0.8rem; font-size: 0.9rem; font-weight: 500; }
.admin-form input[type="text"],
.admin-form input[type="number"],
.admin-form input[type="file"],
.admin-form select,
.admin-form textarea {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.3rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.95rem;
}
.admin-form textarea { resize: vertical; }
.admin-form table { width: 100%; border-collapse: collapse; margin: 0.5rem 0; }
.admin-form th, .admin-form td { padding: 0.4rem 0.6rem; text-align: left; border-bottom: 1px solid var(--border); }

.admin-dashboard button,
.admin-form button,
.login-box button,
.btn,
.btn-small {
    display: inline-block;
    padding: 0.55rem 1.4rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    line-height: 1.4;
    -webkit-appearance: none;
    appearance: none;
}
.admin-dashboard button:hover,
.admin-form button:hover,
.login-box button:hover,
.btn:hover,
.btn-small:hover { background: var(--accent-light); }
.btn-small {
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
}
.btn-danger,
.admin-dashboard button[onclick*="confirm"],
.admin-form button[onclick*="confirm"] { background: #dc2626; }
.btn-danger:hover,
.admin-dashboard button[onclick*="confirm"]:hover,
.admin-form button[onclick*="confirm"]:hover { background: #ef4444; }

.form-actions { margin-top: 1.2rem; display: flex; gap: 0.8rem; align-items: center; }
.form-actions a { color: var(--muted); }

.alert {
    padding: 1rem;
    background: #ecfdf5;
    border: 1px solid #6ee7b7;
    border-radius: 4px;
    margin-bottom: 1rem;
}
.token-display {
    display: block;
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: #f0f0f0;
    border-radius: 3px;
    word-break: break-all;
    font-size: 0.9rem;
}

/* ===== EDITOR ===== */
.editor-wrapper { position: relative; }
.md-preview { display: none; padding: 1rem; border: 1px solid var(--border); border-radius: 4px; min-height: 200px; background: #fff; }
.md-toolbar { display: flex; gap: 0.3rem; margin-top: 0.3rem; }
.md-toolbar button.btn,
.md-toolbar button {
    padding: 0.2rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text);
    background: #fff;
    cursor: pointer;
    font-size: 0.85rem;
}
.md-toolbar button:hover { background: #f0f0f0; }

/* ===== TAG PAGE LIST ===== */
.tag-page h1 { margin-bottom: 0.5rem; }
.page-list { list-style: none; margin: 1rem 0; }
.page-list li { padding: 0.6rem 0; border-bottom: 1px solid var(--border); }
.page-list li a { font-weight: 600; color: var(--accent); text-decoration: none; }
.page-list li a:hover { text-decoration: underline; }
.page-list .summary { display: block; color: var(--muted); font-size: 0.9rem; margin-top: 0.2rem; }
.page-list .meta { display: block; color: var(--muted); font-size: 0.8rem; }
.pagination { display: flex; gap: 0.4rem; align-items: center; margin: 1.5rem 0; flex-wrap: wrap; }
.pagination a, .pagination .current {
    display: inline-block; padding: 0.3rem 0.7rem;
    border: 1px solid var(--border); border-radius: 3px;
    text-decoration: none; font-size: 0.9rem;
}
.pagination a { color: var(--accent); background: var(--white); }
.pagination a:hover { background: var(--black); color: var(--white); border-color: var(--black); }
.pagination .current { background: var(--accent); color: var(--white); border-color: var(--accent); }

/* ===== CHESS BOARDS ===== */
.pgn-viewer, .fen-viewer { --board-size: min(400px, 70vw); margin: 1.5rem auto; max-width: var(--board-size); }
.pgn-viewer.size-sm, .fen-viewer.size-sm { --board-size: min(260px, 60vw); }
.pgn-viewer.size-lg, .fen-viewer.size-lg { --board-size: min(560px, 85vw); }
.fen-viewer { width: var(--board-size); height: var(--board-size); }
.pgn-viewer .board { width: var(--board-size); height: var(--board-size); }
.controls {
    display: flex; align-items: center; justify-content: center;
    gap: 0.4rem; margin-top: 0.5rem;
}
.controls button {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text);
    cursor: pointer;
    border-radius: 3px;
    font-size: 1rem;
    line-height: 1;
}
.controls button:hover { background: var(--black); border-color: var(--black); color: var(--white); }
.move-info { min-width: 9rem; text-align: center; font-family: monospace; color: var(--text); font-size: 0.9rem; }

/* ===== EDIT LINK ===== */
.edit-link { font-size: 0.75rem; font-weight: 500; color: var(--muted); vertical-align: middle; margin-left: 0.5rem; }
.edit-link:hover { color: var(--accent); }
.edit-bar { text-align: right; margin-bottom: 0.5rem; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    header { display: flex; }
    .hamburger { display: flex; }
    .sidebar { transform: translateX(-100%); transition: transform 0.25s; z-index: 99; }
    .sidebar.open { transform: translateX(0); }
    .content { margin-left: 0; padding-top: 48px; }
}