:root {
    --bg: #131c2b;
    --bg-sidebar: #101827;
    --bg-card: #1b2536;
    --bg-input: #101827;
    --border: #2a3648;
    --text: #e8edf3;
    --text-muted: #8b97a8;
    --accent: #f2b632;
    --accent-hover: #ffc94d;
    --success: #3fb950;
    --error: #f85149;
    --info: #58a6ff;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

hr { border: none; border-top: 1px solid var(--border); margin: 16px 0 24px; }

h1 { font-size: 1.7em; margin: 0 0 8px; }
h2 { font-size: 1.3em; }

.text-muted { color: var(--text-muted); }

/* App shell */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: 230px;
    flex-shrink: 0;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 16px 0;
}
.sidebar.collapsed { width: 60px; }
.sidebar.collapsed .label { display: none; }

.sidebar-top { padding: 0 16px 16px; }
.sidebar-toggle {
    background: none; border: none; color: var(--text); font-size: 1.3em; cursor: pointer;
}

.sidebar-nav { flex: 1; display: flex; flex-direction: column; gap: 2px; }

.sidebar-nav a, .sidebar-bottom a {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 20px;
    color: var(--text-muted);
    border-left: 3px solid transparent;
    white-space: nowrap;
}
.sidebar-nav a:hover, .sidebar-bottom a:hover {
    background: rgba(255,255,255,0.04);
    text-decoration: none;
    color: var(--text);
}
.sidebar-nav a.active {
    background: rgba(242,182,50,0.12);
    border-left-color: var(--accent);
    color: var(--accent);
    font-weight: 600;
}
.sidebar-nav .icon, .sidebar-bottom .icon { font-size: 1.2em; width: 20px; text-align: center; }

.sidebar-bottom { border-top: 1px solid var(--border); padding-top: 8px; }

.main-area { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.topbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 32px;
    border-bottom: 1px solid var(--border);
}

.search-form { display: flex; max-width: 420px; flex: 1; }
.search-form input {
    flex: 1; padding: 10px 14px; border: 1px solid var(--border); background: var(--bg-input);
    color: var(--text); border-radius: 6px 0 0 6px; outline: none;
}
.search-form button {
    padding: 10px 16px; background: var(--accent); border: none; border-radius: 0 6px 6px 0;
    cursor: pointer; font-weight: bold;
}

.topbar-user { color: var(--text-muted); }

.container, .container-plain { padding: 32px; max-width: 1100px; }
.container-plain { margin: 0 auto; }

/* Cards / forms */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 24px;
    margin-bottom: 24px;
}

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; color: var(--text-muted); font-size: 0.9em; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-family: inherit;
    font-size: 1em;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--accent);
}

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }

.remember-check { display: flex; align-items: center; gap: 8px; font-size: 0.9em; color: var(--text-muted); }
.remember-check input { width: auto; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95em;
}
.btn-primary { background: var(--accent); color: #1a1200; }
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; }
.btn-secondary { background: var(--bg-input); color: var(--text); border: 1px solid var(--border); }
.btn-success { background: var(--success); color: #06280d; }
.btn-danger { background: var(--error); color: #2b0705; }
.btn-sm { padding: 6px 12px; font-size: 0.85em; }
.btn:hover { opacity: 0.92; text-decoration: none; }

.icon-btn {
    background: none; border: none; color: var(--text-muted); cursor: pointer;
    font-size: 1.1em; padding: 4px 8px;
}
.icon-btn:hover { color: var(--accent); }

/* Alerts */
.alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; }
.alert-success { background: rgba(63,185,80,0.12); color: var(--success); border: 1px solid rgba(63,185,80,0.3); }
.alert-error { background: rgba(248,81,73,0.12); color: var(--error); border: 1px solid rgba(248,81,73,0.3); }
.alert-info { background: rgba(88,166,255,0.12); color: var(--info); border: 1px solid rgba(88,166,255,0.3); }

/* Tables */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-size: 0.85em; text-transform: uppercase; letter-spacing: 0.03em; }
tr:hover td { background: rgba(255,255,255,0.02); }

/* Admin toolbar */
.admin-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; gap: 12px; flex-wrap: wrap; }
.filter-form { display: flex; gap: 8px; align-items: center; }
.filter-form input, .filter-form select {
    padding: 8px 12px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 6px; color: var(--text);
}

/* TOC */
.toc-section { margin: 18px 0 4px; font-size: 1.1em; }
.toc-item { margin: 4px 0; }

/* Chapter content */
.chapter-content { line-height: 1.7; margin-bottom: 24px; }
.chapter-content .bb-img { max-width: 100%; border-radius: 8px; margin: 12px 0; }
.chapter-ref { border-bottom: 1px dashed var(--accent); }
.chapter-ref-broken { color: var(--error); border-bottom: 1px dashed var(--error); cursor: help; }
.bb-list { padding-left: 24px; }
.chapter-images { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.chapter-images img { max-width: 220px; border-radius: 8px; }
.chapter-nav { display: flex; justify-content: space-between; margin-top: 32px; }

/* Chapter editor */
.chapter-form-layout { display: flex; gap: 24px; align-items: flex-start; }
.chapter-form { flex: 1; min-width: 0; }
.media-panel { width: 280px; flex-shrink: 0; }
.editor-toolbar { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }
.editor-toolbar button, .editor-toolbar select {
    background: var(--bg-input); border: 1px solid var(--border); color: var(--text);
    padding: 6px 10px; border-radius: 6px; cursor: pointer; font-size: 0.9em;
}
.editor-toolbar button:hover { border-color: var(--accent); color: var(--accent); }
#contentEditor { font-family: inherit; resize: vertical; }

.upload-form { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.media-list { display: flex; flex-direction: column; gap: 12px; }
.media-item img { width: 100%; border-radius: 6px; margin-bottom: 6px; }
.media-item-actions { display: flex; gap: 6px; }

.search-result h3 { margin: 0 0 6px; }

/* Login */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-box { width: 360px; max-width: 90vw; }
.login-box .card { text-align: left; }
.login-box h2 { text-align: center; margin-bottom: 20px; }

@media (max-width: 800px) {
    .grid { grid-template-columns: 1fr; }
    .chapter-form-layout { flex-direction: column; }
    .media-panel { width: 100%; }
    .sidebar .label { display: none; }
    .sidebar { width: 60px; }
}