/* ============================================================
   Knowledge Hub - Styles (matches home page color palette)
   Primary Blue : #222f6e
   Secondary Blue: #2563eb
   Accent Yellow : #eac000
   Light Gray    : #f3f4f6
   ============================================================ */

:root {
    --kh-primary: #222f6e;
    --kh-secondary: #2563eb;
    --kh-yellow: #eac000;
    --kh-light: #f3f4f6;
    --kh-white: #ffffff;
    --kh-muted: #5f687b;
    --kh-border: #e4e9f2;
    --kh-shadow: rgba(34, 47, 110, 0.10);
    --kh-shadow-hover: rgba(34, 47, 110, 0.18);
}

/* ---- Page wrapper ---------------------------------------- */
.kh-page {
    background: #f8fbff;
    min-height: 80vh;
}

/* ---- Hero banner ----------------------------------------- */
.kh-hero {
    background: linear-gradient(135deg, var(--kh-primary) 0%, #1e40af 100%);
    color: var(--kh-white);
    padding: 3.5rem 0 2.5rem;
    position: relative;
    overflow: hidden;
}

.kh-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.kh-hero h1,
.kh-hero h2 {
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.kh-hero p {
    opacity: .88;
    position: relative;
    z-index: 1;
}

.kh-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    background: rgba(234, 192, 0, 0.2);
    border: 1px solid rgba(234, 192, 0, 0.4);
    color: var(--kh-yellow);
    border-radius: 20px;
    padding: .25rem .75rem;
    font-size: .8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
    margin-bottom: .75rem;
    position: relative;
    z-index: 1;
}

/* ---- Breadcrumb ------------------------------------------ */
.kh-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .35rem;
    font-size: .85rem;
    margin-bottom: 1.5rem;
    padding: .6rem .9rem;
    background: var(--kh-white);
    border-radius: 8px;
    border: 1px solid var(--kh-border);
    box-shadow: 0 1px 4px var(--kh-shadow);
}

.kh-breadcrumb a {
    color: var(--kh-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color .2s;
}

.kh-breadcrumb a:hover { color: var(--kh-primary); }

.kh-breadcrumb-sep {
    color: #c0cad8;
    font-size: .75rem;
}

.kh-breadcrumb-current {
    color: var(--kh-muted);
    font-weight: 400;
}

/* ---- Search form ----------------------------------------- */
.kh-search-card {
    background: var(--kh-white);
    border: 1px solid var(--kh-border);
    border-radius: 14px;
    padding: 1.5rem;
    box-shadow: 0 4px 16px var(--kh-shadow);
    margin-bottom: 2rem;
}

.kh-search-input {
    border: 2px solid var(--kh-border);
    border-radius: 10px;
    padding: .65rem 1rem;
    font-size: .95rem;
    transition: border-color .2s, box-shadow .2s;
}

.kh-search-input:focus {
    border-color: var(--kh-secondary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
    outline: none;
}

.kh-search-btn {
    background: var(--kh-primary);
    color: var(--kh-white);
    border: none;
    border-radius: 10px;
    padding: .65rem 1.5rem;
    font-weight: 600;
    border-bottom: 3px solid var(--kh-yellow);
    transition: background .2s, transform .15s;
}

.kh-search-btn:hover {
    background: #1a2a60;
    color: var(--kh-white);
    transform: translateY(-1px);
}

/* ---- Subject pills --------------------------------------- */
.kh-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    margin-bottom: 2rem;
}

.kh-subject-pill {
    display: inline-flex;
    align-items: center;
    padding: .45rem 1.1rem;
    background: var(--kh-white);
    border: 1.5px solid var(--kh-border);
    border-radius: 100px;
    font-size: .85rem;
    font-weight: 500;
    color: var(--kh-primary);
    text-decoration: none;
    transition: background .2s, border-color .2s, color .2s, transform .15s;
    box-shadow: 0 1px 4px var(--kh-shadow);
}

.kh-subject-pill:hover,
.kh-subject-pill.active {
    background: var(--kh-primary);
    border-color: var(--kh-primary);
    color: var(--kh-white);
    transform: translateY(-1px);
}

/* ---- Section headers ------------------------------------- */
.kh-section-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--kh-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: .5rem;
}

.kh-section-title::before {
    content: '';
    display: block;
    width: 4px;
    height: 1.2em;
    background: var(--kh-yellow);
    border-radius: 2px;
    flex-shrink: 0;
}

/* ---- Article cards --------------------------------------- */
.kh-card {
    background: var(--kh-white);
    border: 1px solid var(--kh-border);
    border-radius: 14px;
    height: 100%;
    transition: transform .25s ease, box-shadow .25s ease;
    box-shadow: 0 2px 8px var(--kh-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.kh-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--kh-shadow-hover);
}

.kh-card-body {
    padding: 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.kh-card-subject {
    display: inline-block;
    font-size: .72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--kh-secondary);
    background: rgba(37, 99, 235, .08);
    border-radius: 6px;
    padding: .2rem .55rem;
    margin-bottom: .6rem;
}

.kh-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: #1a1a2e;
    line-height: 1.45;
    margin-bottom: .5rem;
    flex: 1;
}

.kh-card-title a {
    color: inherit;
    text-decoration: none;
    transition: color .2s;
}

.kh-card-title a:hover { color: var(--kh-secondary); }

.kh-card-excerpt {
    color: var(--kh-muted);
    font-size: .875rem;
    line-height: 1.6;
    margin-bottom: .75rem;
}

.kh-card-meta {
    font-size: .78rem;
    color: #9aa3b0;
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: .5rem;
    flex-wrap: wrap;
}

.kh-card-reading {
    margin-left: auto;
    background: rgba(234, 192, 0, .12);
    color: #9a7a00;
    border-radius: 6px;
    padding: .15rem .5rem;
    font-weight: 600;
    font-size: .72rem;
}

/* Trending card accent */
.kh-card-trending {
    border-top: 3px solid var(--kh-yellow);
}

/* Continue reading card accent */
.kh-card-continue {
    border-top: 3px solid var(--kh-secondary);
}

/* ---- Tags ----------------------------------------------- */
.kh-tag {
    display: inline-block;
    background: rgba(34, 47, 110, .07);
    color: var(--kh-primary);
    border-radius: 100px;
    padding: .25rem .75rem;
    font-size: .78rem;
    font-weight: 500;
    text-decoration: none;
    transition: background .2s, color .2s;
}

.kh-tag:hover {
    background: var(--kh-primary);
    color: var(--kh-white);
}

/* ---- Article show page ----------------------------------- */
.kh-article-header {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px var(--kh-shadow);
    margin-bottom: 1.5rem;
}

.kh-article-header-inner {
    background: linear-gradient(135deg, var(--kh-primary) 0%, #1e40af 100%);
    color: var(--kh-white);
    padding: 2rem;
}

.kh-article-header-inner h1 {
    font-size: 1.7rem;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: .75rem;
}

.kh-article-meta-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .75rem;
    font-size: .85rem;
    opacity: .88;
}

.kh-article-meta-bar a { color: var(--kh-yellow); text-decoration: none; }
.kh-article-meta-bar a:hover { text-decoration: underline; }

.kh-article-body {
    padding: 2rem;
    background: var(--kh-white);
}

.kh-article-content {
    font-size: 1.02rem;
    line-height: 1.85;
    color: #2d3748;
}

.kh-article-content h2,
.kh-article-content h3,
.kh-article-content h4 {
    color: var(--kh-primary);
    margin-top: 2rem;
    margin-bottom: .75rem;
}

.kh-article-content pre {
    background: #f1f5f9;
    border-left: 4px solid var(--kh-secondary);
    padding: 1rem 1.25rem;
    border-radius: 0 8px 8px 0;
    overflow-x: auto;
    font-size: .88rem;
}

.kh-article-content blockquote {
    border-left: 4px solid var(--kh-yellow);
    padding-left: 1.1rem;
    color: var(--kh-muted);
    font-style: italic;
    margin: 1.5rem 0;
}

.kh-article-content a {
    color: var(--kh-secondary);
    font-weight: 500;
}

.kh-article-content img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 16px var(--kh-shadow);
    margin: 1rem 0;
}

/* ---- Vote / helpful / bookmark bar ----------------------- */
.kh-action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: .6rem;
    padding: 1rem 2rem;
    background: #f8fbff;
    border-top: 1px solid var(--kh-border);
    align-items: center;
}

.kh-btn-vote-up {
    background: rgba(34, 197, 94, .1);
    color: #16a34a;
    border: 1.5px solid rgba(34, 197, 94, .3);
    border-radius: 8px;
    padding: .4rem .9rem;
    font-weight: 600;
    font-size: .85rem;
    cursor: pointer;
    transition: background .2s;
}

.kh-btn-vote-up:hover { background: rgba(34, 197, 94, .2); }

.kh-btn-vote-down {
    background: rgba(239, 68, 68, .1);
    color: #dc2626;
    border: 1.5px solid rgba(239, 68, 68, .3);
    border-radius: 8px;
    padding: .4rem .9rem;
    font-weight: 600;
    font-size: .85rem;
    cursor: pointer;
    transition: background .2s;
}

.kh-btn-vote-down:hover { background: rgba(239, 68, 68, .2); }

.kh-btn-bookmark {
    background: rgba(34, 47, 110, .08);
    color: var(--kh-primary);
    border: 1.5px solid var(--kh-border);
    border-radius: 8px;
    padding: .4rem .9rem;
    font-weight: 600;
    font-size: .85rem;
    cursor: pointer;
    transition: background .2s;
}

.kh-btn-bookmark:hover { background: rgba(34, 47, 110, .15); }

/* ---- Helpful widget ------------------------------------- */
.kh-helpful-box {
    padding: 1.25rem 2rem;
    background: rgba(234, 192, 0, .06);
    border-top: 1px solid rgba(234, 192, 0, .3);
}

.kh-helpful-box p {
    font-weight: 600;
    color: var(--kh-primary);
    margin-bottom: .6rem;
}

/* ---- Comments ------------------------------------------- */
.kh-comments-section {
    background: var(--kh-white);
    border: 1px solid var(--kh-border);
    border-radius: 14px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px var(--kh-shadow);
    margin-bottom: 1.5rem;
}

.kh-comments-section h4 {
    color: var(--kh-primary);
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.kh-comment {
    border-left: 3px solid var(--kh-border);
    padding-left: 1rem;
    margin-top: 1.1rem;
}

.kh-comment:first-child { margin-top: 0; }

.kh-comment-author {
    font-weight: 600;
    color: var(--kh-primary);
    font-size: .9rem;
}

.kh-comment-body {
    color: #374151;
    font-size: .92rem;
    margin: .25rem 0 .3rem;
}

.kh-comment-time {
    font-size: .75rem;
    color: #9aa3b0;
}

.kh-reply-thread { border-left: 2px solid rgba(37, 99, 235, .2); }

.kh-comment-input {
    border: 2px solid var(--kh-border);
    border-radius: 10px;
    transition: border-color .2s;
}

.kh-comment-input:focus {
    border-color: var(--kh-secondary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .1);
    outline: none;
}

.kh-btn-comment {
    background: var(--kh-primary);
    color: var(--kh-white);
    border: none;
    border-radius: 8px;
    padding: .45rem 1.1rem;
    font-weight: 600;
    border-bottom: 3px solid var(--kh-yellow);
    font-size: .88rem;
    transition: background .2s;
}

.kh-btn-comment:hover { background: #1a2a60; color: var(--kh-white); }

/* ---- Related articles ------------------------------------ */
.kh-related-card {
    border: 1px solid var(--kh-border);
    border-radius: 10px;
    padding: .9rem 1rem;
    height: 100%;
    transition: box-shadow .2s, transform .2s;
    background: var(--kh-white);
}

.kh-related-card:hover {
    box-shadow: 0 4px 16px var(--kh-shadow-hover);
    transform: translateY(-2px);
}

.kh-related-card a {
    color: var(--kh-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: .92rem;
}

.kh-related-card a:hover { color: var(--kh-secondary); }

/* ---- Topic tree ------------------------------------------ */
.kh-topic-tree {
    background: var(--kh-white);
    border: 1px solid var(--kh-border);
    border-radius: 14px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px var(--kh-shadow);
    margin-bottom: 2rem;
}

.kh-topic-tree h5 {
    color: var(--kh-primary);
    font-weight: 700;
    margin-bottom: 1rem;
}

.kh-topic-link {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    color: var(--kh-secondary);
    font-weight: 600;
    font-size: .9rem;
    text-decoration: none;
    transition: color .2s;
}

.kh-topic-link:hover { color: var(--kh-primary); }

.kh-topic-children {
    list-style: none;
    padding: .4rem 0 0 1rem;
    margin: 0;
}

.kh-topic-children li {
    margin-bottom: .2rem;
}

.kh-topic-children a {
    color: var(--kh-muted);
    font-size: .83rem;
    text-decoration: none;
    transition: color .2s;
}

.kh-topic-children a:hover { color: var(--kh-secondary); }

/* ---- Author profile ------------------------------------- */
.kh-author-banner {
    background: linear-gradient(135deg, var(--kh-primary) 0%, #1e40af 100%);
    color: var(--kh-white);
    border-radius: 14px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 16px var(--kh-shadow);
}

.kh-author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255,255,255,.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    font-weight: 700;
    border: 3px solid var(--kh-yellow);
    flex-shrink: 0;
}

.kh-stat-card {
    background: var(--kh-white);
    border: 1px solid var(--kh-border);
    border-radius: 12px;
    padding: 1.1rem 1.25rem;
    text-align: center;
    box-shadow: 0 2px 8px var(--kh-shadow);
}

.kh-stat-card .kh-stat-num {
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--kh-primary);
    line-height: 1.1;
}

.kh-stat-card .kh-stat-label {
    font-size: .78rem;
    color: var(--kh-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
    margin-top: .2rem;
}

/* ---- Dashboard ------------------------------------------ */
.kh-dash-header {
    background: linear-gradient(135deg, var(--kh-primary) 0%, #1e40af 100%);
    color: var(--kh-white);
    border-radius: 14px;
    padding: 1.75rem 2rem;
    margin-bottom: 1.75rem;
    box-shadow: 0 4px 16px var(--kh-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.kh-dash-header h2 { margin: 0; font-weight: 700; font-size: 1.5rem; }
.kh-dash-header p { margin: .2rem 0 0; opacity: .82; font-size: .9rem; }

.kh-btn-new {
    background: var(--kh-yellow);
    color: #1a1a2e;
    border: none;
    border-radius: 8px;
    padding: .55rem 1.25rem;
    font-weight: 700;
    border-bottom: 3px solid rgba(0,0,0,.15);
    font-size: .9rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    transition: transform .15s, opacity .2s;
    white-space: nowrap;
}

.kh-btn-new:hover { transform: translateY(-1px); opacity: .92; color: #1a1a2e; }

.kh-stats-row { margin-bottom: 1.5rem; }

.kh-stat-badge {
    background: var(--kh-white);
    border: 1px solid var(--kh-border);
    border-radius: 12px;
    padding: 1.1rem 1.25rem;
    box-shadow: 0 2px 8px var(--kh-shadow);
    text-align: center;
}

.kh-stat-badge .num {
    font-size: 2rem;
    font-weight: 700;
    color: var(--kh-primary);
    line-height: 1.1;
}

.kh-stat-badge .label {
    font-size: .78rem;
    color: var(--kh-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
    margin-top: .15rem;
}

.kh-stat-badge.published .num { color: #16a34a; }
.kh-stat-badge.pending .num { color: #d97706; }
.kh-stat-badge.rejected .num { color: #dc2626; }

.kh-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .9rem;
}

.kh-table thead th {
    background: #f1f5f9;
    color: var(--kh-primary);
    font-weight: 700;
    padding: .75rem 1rem;
    border-bottom: 2px solid var(--kh-border);
    text-transform: uppercase;
    font-size: .75rem;
    letter-spacing: .05em;
}

.kh-table tbody tr {
    border-bottom: 1px solid #f0f4f8;
    transition: background .15s;
}

.kh-table tbody tr:hover { background: #f8fbff; }

.kh-table tbody td {
    padding: .75rem 1rem;
    vertical-align: middle;
    color: #374151;
}

.kh-status-badge {
    display: inline-block;
    padding: .2rem .65rem;
    border-radius: 20px;
    font-size: .75rem;
    font-weight: 700;
    text-transform: capitalize;
}

.kh-status-published { background: rgba(22,163,74,.12); color: #16a34a; }
.kh-status-draft { background: rgba(107,114,128,.12); color: #6b7280; }
.kh-status-pending_review { background: rgba(217,119,6,.12); color: #d97706; }
.kh-status-rejected { background: rgba(220,38,38,.12); color: #dc2626; }

.kh-btn-sm-primary {
    background: var(--kh-primary);
    color: var(--kh-white);
    border: none;
    border-radius: 6px;
    padding: .3rem .8rem;
    font-size: .8rem;
    font-weight: 600;
    text-decoration: none;
    transition: background .2s;
}

.kh-btn-sm-primary:hover { background: #1a2a60; color: var(--kh-white); }

.kh-btn-sm-outline {
    background: transparent;
    color: var(--kh-primary);
    border: 1.5px solid var(--kh-primary);
    border-radius: 6px;
    padding: .3rem .8rem;
    font-size: .8rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background .2s, color .2s;
}

.kh-btn-sm-outline:hover { background: var(--kh-primary); color: var(--kh-white); }

/* ---- Pagination ----------------------------------------- */
.kh-page .pagination .page-link {
    color: var(--kh-primary);
    border-color: var(--kh-border);
}

.kh-page .pagination .page-item.active .page-link {
    background: var(--kh-primary);
    border-color: var(--kh-primary);
    color: var(--kh-white);
}

/* ---- Navbar search bar ----------------------------------- */
.kh-nav-search {
    position: relative;
    display: flex;
    align-items: center;
}

.kh-nav-search-form {
    display: flex;
    align-items: center;
    background: rgba(34, 47, 110, .06);
    border: 1.5px solid rgba(34, 47, 110, .15);
    border-radius: 100px;
    padding: .25rem .5rem .25rem .9rem;
    transition: border-color .2s, box-shadow .2s;
}

.kh-nav-search-form:focus-within {
    border-color: var(--kh-secondary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
    background: var(--kh-white);
}

.kh-nav-search-input {
    border: none;
    background: transparent;
    font-size: .85rem;
    width: 160px;
    color: #1a1a2e;
    outline: none;
}

.kh-nav-search-input::placeholder { color: #9aa3b0; }

.kh-nav-search-submit {
    background: var(--kh-primary);
    color: var(--kh-white);
    border: none;
    border-radius: 100px;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .8rem;
    cursor: pointer;
    flex-shrink: 0;
    transition: background .2s;
}

.kh-nav-search-submit:hover { background: #1a2a60; }

@media (max-width: 768px) {
    .kh-nav-search-input { width: 110px; }
    .kh-hero { padding: 2rem 0 1.5rem; }
    .kh-article-header-inner h1 { font-size: 1.3rem; }
    .kh-action-bar { padding: .75rem 1rem; }
    .kh-article-body { padding: 1.25rem; }
    .kh-dash-header { padding: 1.25rem; }
}