/* ================================================================
   admin.css — Trang Quản trị
   ================================================================ */
:root {
    --sidebar-w: 220px;
    --save-h: 60px;
    --c-bg: #0f1117;
    --c-surface: #181c26;
    --c-card: #1e2330;
    --c-border: rgba(255,255,255,0.08);
    --c-gold: #cba85d;
    --c-gold-dim: rgba(203,168,93,0.15);
    --c-text: #e8eaf0;
    --c-muted: #7a8294;
    --c-danger: #e05656;
    --c-success: #4caf7d;
    --radius: 10px;
    --shadow: 0 4px 20px rgba(0,0,0,0.4);
    --font: 'Inter', sans-serif;
    --font-h: 'Montserrat', sans-serif;
    --trans: all 0.25s ease;
}

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

body {
    font-family: var(--font);
    background: var(--c-bg);
    color: var(--c-text);
    min-height: 100vh;
    font-size: 0.9rem;
}

/* ── LOGIN ── */
.login-overlay {
    position: fixed; inset:0;
    background: #070a10 url('bg_minimal.jpg') center/cover;
    display: flex; align-items:center; justify-content:center;
    z-index: 9999;
}
.login-box {
    background: rgba(20,24,36,0.95);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(203,168,93,0.25);
    border-radius: 16px;
    padding: 2.5rem 3rem;
    width: 380px; max-width: 92vw;
    display: flex; flex-direction:column; align-items:center;
    box-shadow: 0 30px 60px rgba(0,0,0,0.6);
    animation: fadeIn 0.6s ease;
}
@keyframes fadeIn { from{opacity:0;transform:translateY(16px)} to{opacity:1;transform:none} }
.login-logo { font-size:3rem; margin-bottom:0.75rem; }
.login-title {
    font-family: var(--font-h); font-size:1.2rem; font-weight:800;
    letter-spacing:0.15em; color:#fff; margin-bottom:0.25rem;
}
.login-subtitle { font-size:0.8rem; color:var(--c-muted); margin-bottom:1.5rem; }
.login-form { width:100%; display:flex; flex-direction:column; gap:0.75rem; }
.login-form label { font-size:0.78rem; color:var(--c-muted); font-weight:600; letter-spacing:0.08em; }
.login-error {
    background: rgba(224,86,86,0.15); border:1px solid rgba(224,86,86,0.4);
    color:#f08080; padding:0.6rem 1rem; border-radius:8px;
    font-size:0.82rem; text-align:center; margin-bottom:0.5rem; width:100%;
}
.login-back { margin-top:1.5rem; font-size:0.8rem; color:var(--c-muted); text-decoration:none; }
.login-back:hover { color:var(--c-gold); }

/* ── LAYOUT ── */
.admin-dashboard {
    display: flex; min-height:100vh;
}
.admin-dashboard.hidden { display:none; }

/* ── SIDEBAR ── */
.admin-sidebar {
    width: var(--sidebar-w); flex-shrink:0;
    background: var(--c-surface);
    border-right: 1px solid var(--c-border);
    display: flex; flex-direction:column;
    position: fixed; top:0; left:0; height:100vh; overflow-y:auto;
}
.sidebar-header {
    padding: 1.5rem 1.2rem 1rem;
    display:flex; align-items:center; gap:0.75rem;
    border-bottom: 1px solid var(--c-border);
}
.sidebar-logo { font-size:1.6rem; }
.sidebar-title {
    font-family:var(--font-h); font-size:0.75rem; font-weight:700;
    letter-spacing:0.1em; line-height:1.4; color:#fff;
}
.sidebar-title small { font-family:var(--font); font-weight:400; color:var(--c-muted); letter-spacing:0; font-size:0.7rem; }

.sidebar-nav {
    flex:1; padding: 1rem 0.75rem; display:flex; flex-direction:column; gap:0.25rem;
}
.nav-tab {
    width:100%; display:flex; align-items:center; gap:0.65rem;
    padding:0.65rem 0.9rem; border:none; border-radius:8px;
    background:transparent; color:var(--c-muted);
    font-family:var(--font); font-size:0.82rem; font-weight:500;
    cursor:pointer; text-align:left;
    transition:var(--trans);
}
.nav-tab:hover { background:var(--c-gold-dim); color:var(--c-text); }
.nav-tab.active { background:var(--c-gold-dim); color:var(--c-gold); font-weight:600; }
.nav-icon { font-size:1rem; flex-shrink:0; }

.sidebar-footer {
    padding:1rem 0.75rem;
    border-top:1px solid var(--c-border);
    display:flex; flex-direction:column; gap:0.5rem;
}

/* ── MAIN CONTENT ── */
.admin-content {
    margin-left: var(--sidebar-w);
    flex:1; display:flex; flex-direction:column;
    min-height:100vh;
}

/* Save bar */
.save-bar {
    position:sticky; top:0; z-index:100;
    height:var(--save-h);
    background:var(--c-surface);
    border-bottom:1px solid var(--c-border);
    display:flex; align-items:center; justify-content:flex-end;
    padding:0 2rem; gap:1rem;
}
.save-status { font-size:0.82rem; color:var(--c-muted); }
.save-status.success { color:var(--c-success); }
.save-status.error { color:var(--c-danger); }

/* Tab panels */
.tab-panel { display:none; padding:2rem; }
.tab-panel.active { display:block; }
.tab-panel.hidden { display:none; }
.tab-title {
    font-family:var(--font-h); font-size:1.2rem; font-weight:700;
    color:#fff; margin-bottom:1.5rem; padding-bottom:0.75rem;
    border-bottom:1px solid var(--c-border);
}

/* Cards */
.card {
    background:var(--c-card); border:1px solid var(--c-border);
    border-radius:var(--radius); padding:1.5rem;
    margin-bottom:1.5rem;
}
.card-title {
    font-family:var(--font-h); font-size:0.9rem; font-weight:700;
    color:var(--c-gold); text-transform:uppercase; letter-spacing:0.08em;
    margin-bottom:1rem;
}

/* Form elements */
.text-input, .textarea-input, .select-input {
    width:100%; padding:0.7rem 1rem;
    background:rgba(255,255,255,0.06);
    border:1px solid var(--c-border); border-radius:8px;
    color:var(--c-text); font-family:var(--font); font-size:0.88rem;
    transition:var(--trans); outline:none;
}
.text-input:focus, .textarea-input:focus, .select-input:focus {
    border-color:var(--c-gold);
    background:rgba(203,168,93,0.05);
}
.textarea-input { min-height:180px; resize:vertical; line-height:1.6; }
.select-input { cursor:pointer; }
.select-input option { background:var(--c-card); }

.field-group { display:flex; flex-direction:column; gap:0.4rem; flex:1; }
.field-group label { font-size:0.75rem; font-weight:600; color:var(--c-muted); letter-spacing:0.06em; }
.bilingual-row { display:flex; gap:1rem; }

/* Buttons */
.btn-primary {
    padding:0.65rem 1.5rem;
    background:var(--c-gold); color:#080c10;
    border:none; border-radius:8px;
    font-family:var(--font); font-size:0.88rem; font-weight:700;
    cursor:pointer; transition:var(--trans);
    letter-spacing:0.04em;
}
.btn-primary:hover { background:#e8c46a; transform:translateY(-1px); }
.btn-secondary {
    padding:0.55rem 1.2rem;
    background:rgba(255,255,255,0.08); color:var(--c-text);
    border:1px solid var(--c-border); border-radius:8px;
    font-family:var(--font); font-size:0.84rem; font-weight:500;
    cursor:pointer; transition:var(--trans);
}
.btn-secondary:hover { border-color:var(--c-gold); color:var(--c-gold); }
.btn-ghost {
    padding:0.55rem 1rem;
    background:transparent; color:var(--c-muted);
    border:1px solid var(--c-border); border-radius:8px;
    font-family:var(--font); font-size:0.82rem; font-weight:500;
    cursor:pointer; transition:var(--trans);
}
.btn-ghost:hover { color:var(--c-danger); border-color:var(--c-danger); }
.btn-danger {
    padding:0.45rem 0.9rem;
    background:rgba(224,86,86,0.12); color:var(--c-danger);
    border:1px solid rgba(224,86,86,0.3); border-radius:6px;
    font-family:var(--font); font-size:0.78rem; font-weight:600;
    cursor:pointer; transition:var(--trans);
}
.btn-danger:hover { background:rgba(224,86,86,0.25); }
.btn-sm { font-size:0.8rem; padding:0.45rem 0.9rem; }
.btn-save { min-width:180px; }
.btn-upload {
    display:inline-flex; align-items:center; gap:0.4rem;
    padding:0.55rem 1.2rem;
    background:rgba(203,168,93,0.1); color:var(--c-gold);
    border:1px solid rgba(203,168,93,0.3); border-radius:8px;
    font-family:var(--font); font-size:0.82rem; font-weight:600;
    cursor:pointer; transition:var(--trans);
}
.btn-upload:hover { background:rgba(203,168,93,0.2); }
.file-input { display:none; }

/* Logo preview */
.logo-preview-row { display:flex; align-items:center; gap:1.5rem; flex-wrap:wrap; }
.logo-preview-img { width:80px; height:80px; object-fit:contain; border-radius:8px; border:1px solid var(--c-border); }

/* Banner preview */
.banner-preview-wrap { margin-bottom:0.75rem; border-radius:8px; overflow:hidden; }
.banner-placeholder-small {
    background:rgba(255,255,255,0.04); border:1px dashed rgba(203,168,93,0.2);
    border-radius:6px; padding:1.5rem; text-align:center;
    color:var(--c-muted); font-size:0.82rem;
}
.upload-row { display:flex; align-items:center; gap:0.75rem; flex-wrap:wrap; }

/* Category list */
.sortable-list { display:flex; flex-direction:column; gap:0.75rem; }
.cat-item {
    background:rgba(255,255,255,0.04);
    border:1px solid var(--c-border); border-radius:8px;
    padding:0.75rem 1rem;
}
.cat-item-header {
    display:flex; align-items:center; gap:0.75rem; margin-bottom:0.75rem;
}
.cat-item-name { flex:1; font-weight:600; color:#fff; }
.cat-item-actions { display:flex; gap:0.4rem; }
.cat-details { display:flex; gap:0.75rem; flex-wrap:wrap; margin-bottom:0.75rem; }
.children-section { border-top:1px solid var(--c-border); padding-top:0.75rem; margin-top:0.75rem; }
.children-section h4 { font-size:0.78rem; color:var(--c-muted); margin-bottom:0.5rem; font-weight:600; }
.child-item {
    display:flex; align-items:center; gap:0.6rem; margin-bottom:0.4rem;
    padding:0.4rem 0.7rem; background:rgba(255,255,255,0.03);
    border:1px solid rgba(255,255,255,0.05); border-radius:6px;
}
.child-item input { flex:1; }
.icon-select {
    padding:0.4rem 0.6rem;
    background:rgba(255,255,255,0.06);
    border:1px solid var(--c-border); border-radius:6px;
    color:var(--c-text); font-family:var(--font); font-size:0.82rem;
    cursor:pointer; width:140px;
}

/* Topics layout */
.topics-layout { display:flex; gap:1.5rem; min-height:500px; }
.topics-sidebar { width:220px; flex-shrink:0; }
.topic-admin-list { display:flex; flex-direction:column; gap:0.4rem; }
.topic-admin-btn {
    display:flex; align-items:center; justify-content:space-between;
    padding:0.6rem 0.9rem; border-radius:8px;
    border:1px solid var(--c-border); background:rgba(255,255,255,0.04);
    color:var(--c-text); font-family:var(--font); font-size:0.84rem;
    cursor:pointer; transition:var(--trans); text-align:left; gap:0.5rem;
}
.topic-admin-btn:hover { border-color:var(--c-gold); color:var(--c-gold); }
.topic-admin-btn.active { background:var(--c-gold-dim); border-color:var(--c-gold); color:var(--c-gold); font-weight:600; }
.topic-editor { flex:1; }

/* Content editor layout */
.content-layout { display:flex; gap:1.5rem; }
.content-selector { width:220px; flex-shrink:0; display:flex; flex-direction:column; gap:0.5rem; }
.content-selector label { font-size:0.75rem; color:var(--c-muted); font-weight:600; }
.content-editor-area { flex:1; }

/* Content editor tabs (VI / EN) */
.editor-lang-tabs { display:flex; gap:0.5rem; margin-bottom:1rem; }
.editor-lang-tab {
    padding:0.5rem 1.2rem; border-radius:8px;
    border:1px solid var(--c-border);
    background:transparent; color:var(--c-muted);
    font-family:var(--font); font-size:0.82rem; font-weight:600;
    cursor:pointer; transition:var(--trans);
}
.editor-lang-tab.active { background:var(--c-gold-dim); border-color:var(--c-gold); color:var(--c-gold); }
.editor-lang-panel { display:none; }
.editor-lang-panel.active { display:block; }

/* Content editor sections */
.editor-section { margin-bottom:1.5rem; }
.editor-section-title {
    font-size:0.78rem; font-weight:700; color:var(--c-muted);
    text-transform:uppercase; letter-spacing:0.08em;
    margin-bottom:0.5rem;
}

/* Upload list */
.uploaded-list { display:flex; flex-direction:column; gap:0.4rem; margin-top:0.5rem; }
.uploaded-item {
    display:flex; align-items:center; gap:0.6rem;
    padding:0.5rem 0.8rem;
    background:rgba(255,255,255,0.04); border:1px solid var(--c-border); border-radius:6px;
    font-size:0.82rem;
}
.uploaded-item span { flex:1; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.uploaded-item img { width:40px; height:40px; object-fit:cover; border-radius:4px; }

/* YouTube links */
.yt-list { display:flex; flex-direction:column; gap:0.4rem; margin-top:0.5rem; }
.yt-item {
    display:flex; align-items:center; gap:0.5rem;
}
.yt-item input { flex:1; }

/* Article link list */
.link-list { display:flex; flex-direction:column; gap:0.4rem; margin-top:0.5rem; }
.link-item { display:flex; gap:0.4rem; align-items:center; flex-wrap:wrap; }
.link-item input { flex:1; min-width:120px; }

/* Rich text toolbar */
.rte-toolbar {
    display:flex; gap:0.3rem; flex-wrap:wrap;
    padding:0.4rem; background:rgba(255,255,255,0.04);
    border:1px solid var(--c-border); border-radius:8px 8px 0 0;
    border-bottom:none;
}
.rte-btn {
    padding:0.3rem 0.7rem; border:none; border-radius:5px;
    background:rgba(255,255,255,0.06); color:var(--c-text);
    font-family:var(--font); font-size:0.8rem; font-weight:600;
    cursor:pointer; transition:var(--trans);
}
.rte-btn:hover { background:var(--c-gold-dim); color:var(--c-gold); }
.rte-editor {
    min-height:160px; padding:0.8rem;
    background:rgba(255,255,255,0.04);
    border:1px solid var(--c-border); border-radius:0 0 8px 8px;
    color:var(--c-text); font-family:var(--font); font-size:0.88rem;
    line-height:1.7; outline:none;
}
.rte-editor:focus { border-color:var(--c-gold); }

/* Empty states */
.empty-state-admin {
    color:var(--c-muted); text-align:center; padding:3rem 1rem;
    font-size:0.88rem;
}
.hidden { display:none !important; }

/* Password message */
.pass-msg {
    padding:0.6rem 1rem; border-radius:8px;
    font-size:0.82rem; margin-top:0.5rem;
}
.pass-msg.success { background:rgba(76,175,125,0.1); border:1px solid rgba(76,175,125,0.3); color:var(--c-success); }
.pass-msg.error { background:rgba(224,86,86,0.1); border:1px solid rgba(224,86,86,0.3); color:var(--c-danger); }

/* Toast */
.toast {
    position:fixed; bottom:2rem; right:2rem; z-index:99999;
    padding:0.8rem 1.5rem; border-radius:10px;
    font-size:0.88rem; font-weight:600;
    box-shadow:0 8px 20px rgba(0,0,0,0.4);
    animation: toastIn 0.3s ease;
}
.toast.success { background:rgba(76,175,125,0.95); color:#fff; }
.toast.error   { background:rgba(224,86,86,0.95); color:#fff; }
@keyframes toastIn { from{opacity:0;transform:translateY(16px)} to{opacity:1;transform:none} }

/* Responsive */
@media (max-width:768px) {
    .admin-sidebar { display:none; }
    .admin-content { margin-left:0; }
    .bilingual-row { flex-direction:column; }
    .topics-layout, .content-layout { flex-direction:column; }
    .topics-sidebar, .content-selector { width:100%; }
}

/* Upload guidance hint */
.upload-hint {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.78rem;
    color: #cba85d;
    line-height: 1.5;
    background: rgba(203,168,93,0.08);
    border-left: 3px solid #cba85d;
    padding: 0.45rem 0.75rem;
    border-radius: 0 6px 6px 0;
}

/* Article Admin Cards & Bounded Thumbnails */
.art-admin-card {
    background: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    margin-bottom: 1.2rem;
    overflow: hidden;
    transition: var(--trans);
}
.art-admin-card.collapsed {
    border-color: rgba(203,168,93,0.3);
}
.art-admin-card.collapsed .art-admin-card-body {
    display: none !important;
}
.art-admin-card-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 1.2rem;
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid var(--c-border);
}
.art-admin-card.collapsed .art-admin-card-header {
    border-bottom: none;
    cursor: pointer;
    background: rgba(203,168,93,0.04);
}
.art-admin-card.collapsed .art-admin-card-header:hover {
    background: rgba(203,168,93,0.08);
}
.art-admin-card.collapsed .btn-edit-article {
    display: inline-flex !important;
}
.art-admin-card:not(.collapsed) .btn-edit-article {
    display: none !important;
}
.art-thumb-sm {
    width: 36px !important;
    height: 36px !important;
    max-width: 36px !important;
    max-height: 36px !important;
    object-fit: cover;
    border-radius: 6px;
    flex-shrink: 0;
    border: 1px solid var(--c-border);
}
.art-thumb-ph {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.06);
    border-radius: 6px;
    font-size: 1rem;
    flex-shrink: 0;
}
.art-admin-card-title {
    flex: 1;
    font-weight: 600;
    color: var(--c-text);
    font-size: 0.92rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.art-admin-card-body {
    padding: 1.2rem;
}
.save-article-bar {
    margin-top: 1.2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--c-border);
    display: flex;
    justify-content: flex-end;
}
.btn-save-article {
    padding: 0.6rem 1.4rem;
    background: #4caf7d;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--trans);
}
.btn-save-article:hover {
    background: #3d9d6c;
}
.btn-edit-article {
    padding: 0.45rem 0.9rem;
    background: rgba(203,168,93,0.15);
    color: var(--c-gold);
    border: 1px solid rgba(203,168,93,0.3);
    border-radius: 6px;
    font-family: var(--font);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--trans);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}
.btn-edit-article:hover {
    background: rgba(203,168,93,0.3);
}

/* ── Q&A ADMIN STYLES ── */
.qa-admin-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--c-border);
    border-radius: 10px;
    padding: 1.25rem;
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.qa-admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    border-bottom: 1px dashed var(--c-border);
    padding-bottom: 0.75rem;
}
.qa-admin-user {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    flex-wrap: wrap;
}
.qa-admin-name {
    font-weight: 700;
    color: #fff;
    font-size: 0.95rem;
}
.qa-admin-phone {
    color: var(--c-gold);
    font-weight: 600;
    font-size: 0.88rem;
    background: rgba(203,168,93,0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    border: 1px solid rgba(203,168,93,0.2);
}
.qa-admin-date {
    font-size: 0.8rem;
    color: var(--c-muted);
}
.qa-admin-qbox {
    background: rgba(0,0,0,0.2);
    border-left: 3px solid var(--c-gold);
    padding: 0.8rem 1rem;
    border-radius: 0 8px 8px 0;
}
.qa-admin-qtitle {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--c-gold);
    text-transform: uppercase;
    margin-bottom: 0.3rem;
}
.qa-admin-qtext {
    font-size: 0.9rem;
    color: var(--c-text);
    line-height: 1.5;
}
.qa-admin-replybox {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}
.qa-admin-replytitle {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--c-success);
    text-transform: uppercase;
}
.qa-admin-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 0.25rem;
}

/* Album Gallery Thumbnails Grid (Matching Image 2) */
.gallery-thumb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 0.75rem;
    margin-top: 0.75rem;
}
.gallery-thumb-item {
    position: relative;
    aspect-ratio: 4/3;
    border-radius: 8px;
    overflow: hidden;
    background: #0f1117;
    border: 1px solid var(--c-border);
}
.gallery-thumb-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.gallery-thumb-num {
    position: absolute;
    bottom: 4px;
    left: 4px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 0.7rem;
    padding: 1px 6px;
    border-radius: 4px;
    font-weight: 700;
}
.gallery-thumb-del {
    position: absolute;
    top: 4px;
    right: 4px;
    background: rgba(224,56,56,0.9);
    color: #fff;
    border: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    font-size: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.15s ease;
}
.gallery-thumb-del:hover {
    transform: scale(1.15);
    background: #e05656;
}