:root{--accent:#2563EB;--navy:#0F172A;--clr-bg:#F8FAFC;--clr-bg-2:#FFFFFF;--clr-text:#1A1A2E;--clr-text-muted:#64748B;--clr-border:#E2E8F0;--radius:10px;--shadow:0 2px 12px rgba(0,0,0,.06);--transition:.2s ease}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:15px}
body{font-family:'Plus Jakarta Sans',sans-serif;background:var(--clr-bg);color:var(--clr-text);line-height:1.6}
a{color:var(--accent);text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}

/* Layout */
.admin-body{display:flex;min-height:100vh}

/* Sidebar */
.sidebar{width:240px;background:var(--navy);color:#94a3b8;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;overflow-y:auto;transition:transform var(--transition)}
.sidebar__brand{padding:1.5rem 1.25rem 1rem;border-bottom:1px solid rgba(255,255,255,.07)}
.sidebar__logo{display:block;font-weight:800;font-size:1.1rem;color:#fff;letter-spacing:-.02em}
.sidebar__sub{font-size:.7rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:#64748b;margin-top:.2rem;display:block}
.sidebar__nav{flex:1;padding:1rem 0}
.sidebar__group{padding:.5rem 0}
.sidebar__group-label{display:block;font-size:.65rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#475569;padding:.25rem 1.25rem;margin-bottom:.25rem}
.sidebar__link{display:flex;align-items:center;gap:.75rem;padding:.65rem 1.25rem;font-size:.875rem;font-weight:500;color:#94a3b8;border-left:3px solid transparent;transition:all var(--transition)}
.sidebar__link:hover,.sidebar__link.active{color:#fff;background:rgba(255,255,255,.05);border-left-color:var(--accent);opacity:1}
.sidebar__link svg{flex-shrink:0;opacity:.7}
.sidebar__link.active svg{opacity:1}
.sidebar__badge{margin-left:auto;background:var(--accent);color:#fff;font-size:.65rem;font-weight:700;padding:.15rem .5rem;border-radius:100px}
.sidebar__footer{padding:1rem;border-top:1px solid rgba(255,255,255,.07)}
.sidebar__link--danger:hover{color:#f87171;background:rgba(248,113,113,.07)}

/* Main */
.admin-main{margin-left:240px;flex:1;display:flex;flex-direction:column;min-height:100vh}

/* Topbar */
.topbar{background:var(--clr-bg-2);border-bottom:1px solid var(--clr-border);height:60px;display:flex;align-items:center;gap:1rem;padding:0 1.75rem;position:sticky;top:0;z-index:50}
.topbar__toggle{display:none;flex-direction:column;gap:4px;background:none;border:none;cursor:pointer;padding:.25rem}
.topbar__toggle span{display:block;width:20px;height:2px;background:var(--clr-text);border-radius:2px}
.topbar__breadcrumb{flex:1;display:flex;align-items:center;gap:.5rem;font-size:.85rem;color:var(--clr-text-muted)}
.topbar__breadcrumb a{color:var(--accent)}
.topbar__user{display:flex;align-items:center;gap:.75rem;font-size:.875rem;font-weight:600;color:var(--clr-text)}
.topbar__avatar{width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem}

/* Content */
.admin-content{flex:1;padding:2rem 1.75rem;max-width:1280px}

/* Page header */
.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:2rem;flex-wrap:wrap;gap:1rem}
.page-header h1{font-size:1.5rem;font-weight:800;color:var(--navy)}
.page-header p{font-size:.875rem;color:var(--clr-text-muted);margin-top:.2rem}

/* Stats */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:1.25rem;margin-bottom:2rem}
.stat-card{background:var(--clr-bg-2);border:1px solid var(--clr-border);border-radius:var(--radius);padding:1.5rem;display:flex;flex-direction:column;gap:.5rem}
.stat-card__icon{width:40px;height:40px;border-radius:8px;background:rgba(37,99,235,.08);color:var(--accent);display:flex;align-items:center;justify-content:center}
.stat-card__value{font-size:2rem;font-weight:800;color:var(--navy);line-height:1}
.stat-card__label{font-size:.8rem;font-weight:600;color:var(--clr-text-muted);text-transform:uppercase;letter-spacing:.06em}

/* Admin table */
.admin-table-wrap{background:var(--clr-bg-2);border:1px solid var(--clr-border);border-radius:var(--radius);overflow:hidden}
.admin-table-toolbar{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.25rem;gap:1rem;flex-wrap:wrap}
.admin-search{display:flex;align-items:center;gap:.5rem;background:var(--clr-bg);border:1.5px solid var(--clr-border);border-radius:8px;padding:.5rem .875rem}
.admin-search input{border:none;background:none;outline:none;font-family:inherit;font-size:.875rem;width:200px}
.admin-table{width:100%;border-collapse:collapse;font-size:.875rem}
.admin-table th{background:var(--clr-bg);font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--clr-text-muted);padding:.875rem 1.25rem;border-bottom:1px solid var(--clr-border);text-align:left;white-space:nowrap}
.admin-table td{padding:.875rem 1.25rem;border-bottom:1px solid var(--clr-border);color:var(--clr-text);vertical-align:middle}
.admin-table tr:last-child td{border-bottom:none}
.admin-table tr:hover td{background:rgba(37,99,235,.02)}
.table-actions{display:flex;gap:.5rem;align-items:center}
.btn-icon{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:6px;border:1px solid var(--clr-border);background:var(--clr-bg);color:var(--clr-text-muted);cursor:pointer;transition:all var(--transition)}
.btn-icon:hover{border-color:var(--accent);color:var(--accent)}
.btn-icon.danger:hover{border-color:#dc2626;color:#dc2626;background:rgba(220,38,38,.05)}
.admin-pagination{display:flex;align-items:center;justify-content:center;gap:.75rem;padding:1rem;border-top:1px solid var(--clr-border)}
.pag-btn{padding:.5rem 1rem;border:1px solid var(--clr-border);border-radius:6px;font-size:.8rem;font-weight:600;color:var(--clr-text-muted);cursor:pointer;background:var(--clr-bg);transition:all var(--transition)}
.pag-btn:hover,.pag-btn.active{border-color:var(--accent);color:var(--accent)}
.pag-info{font-size:.8rem;color:var(--clr-text-muted)}

/* Form card */
.form-card{background:var(--clr-bg-2);border:1px solid var(--clr-border);border-radius:var(--radius);padding:2rem;max-width:860px}
.form-card--wide{max-width:1100px}
.form-section{margin-bottom:1.75rem}
.form-section h3{font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--clr-text-muted);margin-bottom:1rem;padding-bottom:.5rem;border-bottom:1px solid var(--clr-border)}
.form-group{display:flex;flex-direction:column;gap:.375rem;margin-bottom:1.25rem}
.form-group label{font-size:.8rem;font-weight:700;color:var(--navy);letter-spacing:.02em}
.form-group input[type=text],.form-group input[type=email],.form-group input[type=number],.form-group input[type=url],.form-group input[type=color],.form-group input[type=password],.form-group select,.form-group textarea{width:100%;padding:.65rem .875rem;border:1.5px solid var(--clr-border);border-radius:7px;font-family:inherit;font-size:.875rem;color:var(--clr-text);background:#fff;transition:border-color var(--transition)}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.08)}
.form-group .hint{font-size:.75rem;color:var(--clr-text-muted)}
.form-row-2{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.form-row-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1.25rem}
.form-actions{display:flex;align-items:center;gap:1rem;margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--clr-border)}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.25rem;border-radius:7px;font-weight:600;font-size:.875rem;border:1.5px solid transparent;cursor:pointer;transition:all var(--transition);font-family:inherit}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-primary:hover{opacity:.9}
.btn-outline{background:transparent;color:var(--accent);border-color:var(--accent)}
.btn-outline:hover{background:var(--accent);color:#fff}
.btn-danger{background:#dc2626;color:#fff;border-color:#dc2626}
.btn-danger:hover{opacity:.9}
.btn-sm{padding:.4rem .875rem;font-size:.8rem}
.btn-full{width:100%;justify-content:center}

/* Toggle switch */
.toggle-wrap{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.25rem;border:1px solid var(--clr-border);border-radius:var(--radius);background:var(--clr-bg-2);margin-bottom:.75rem}
.toggle-wrap label{font-weight:600;font-size:.9rem;color:var(--navy)}
.toggle-wrap p{font-size:.8rem;color:var(--clr-text-muted);margin-top:.1rem}
.toggle{position:relative;display:inline-block;width:46px;height:26px}
.toggle input{opacity:0;width:0;height:0}
.toggle-slider{position:absolute;cursor:pointer;inset:0;background:#CBD5E1;border-radius:100px;transition:var(--transition)}
.toggle-slider::before{content:'';position:absolute;height:20px;width:20px;left:3px;bottom:3px;background:#fff;border-radius:50%;transition:var(--transition)}
.toggle input:checked+.toggle-slider{background:var(--accent)}
.toggle input:checked+.toggle-slider::before{transform:translateX(20px)}

/* Badges */
.badge{display:inline-block;padding:.25rem .65rem;border-radius:100px;font-size:.7rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.badge-published{background:rgba(22,163,74,.1);color:#166534}
.badge-draft{background:rgba(100,116,139,.1);color:#475569}
.badge-read{background:rgba(22,163,74,.1);color:#166534}
.badge-unread{background:rgba(37,99,235,.1);color:var(--accent)}
.badge-featured{background:rgba(217,119,6,.1);color:#b45309}
.badge-beginner{background:rgba(22,163,74,.1);color:#166534}
.badge-intermediate{background:rgba(217,119,6,.1);color:#b45309}
.badge-advanced{background:rgba(220,38,38,.1);color:#991b1b}

/* Image preview */
.img-preview{margin-top:.5rem;display:flex;gap:.5rem;flex-wrap:wrap}
.img-preview img{width:80px;height:80px;object-fit:cover;border-radius:6px;border:1px solid var(--clr-border)}

/* Sortable drag handle */
.drag-handle{cursor:grab;color:var(--clr-text-muted);padding:.25rem}
.sortable-ghost{opacity:.3;background:rgba(37,99,235,.05)}

/* Alert */
.alert{padding:.875rem 1.25rem;border-radius:var(--radius);margin-bottom:1.5rem;font-weight:500;font-size:.875rem}
.alert-success{background:rgba(22,163,74,.08);color:#166534;border:1px solid rgba(22,163,74,.2)}
.alert-error{background:rgba(220,38,38,.08);color:#991b1b;border:1px solid rgba(220,38,38,.2)}

/* Login page */
.login-page{min-height:100vh;background:var(--clr-bg);display:flex;align-items:center;justify-content:center;padding:2rem}
.login-card{background:#fff;border:1px solid var(--clr-border);border-radius:var(--radius);padding:2.5rem;width:100%;max-width:420px;box-shadow:var(--shadow)}
.login-card__logo{font-size:1.3rem;font-weight:800;color:var(--navy);text-align:center;margin-bottom:.25rem}
.login-card__sub{text-align:center;font-size:.875rem;color:var(--clr-text-muted);margin-bottom:2rem}

/* Dashboard recent */
.recent-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:1.5rem}
.recent-card{background:var(--clr-bg-2);border:1px solid var(--clr-border);border-radius:var(--radius);overflow:hidden}
.recent-card h3{padding:1rem 1.25rem;font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--clr-text-muted);border-bottom:1px solid var(--clr-border)}
.recent-list li{padding:.75rem 1.25rem;border-bottom:1px solid var(--clr-border);font-size:.875rem;display:flex;justify-content:space-between;align-items:center}
.recent-list li:last-child{border-bottom:none}

/* Message detail */
.message-card{background:var(--clr-bg-2);border:1px solid var(--clr-border);border-radius:var(--radius);padding:2rem;max-width:700px}
.message-card__header{margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--clr-border)}
.message-card__body{color:var(--clr-text-muted);line-height:1.8;white-space:pre-wrap;word-break:break-word}

/* Color swatch */
.color-swatch{width:36px;height:36px;border-radius:6px;border:1.5px solid var(--clr-border);cursor:pointer;padding:2px}

/* Responsive */
@media(max-width:900px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:none}
  .admin-main{margin-left:0}
  .topbar__toggle{display:flex}
  .recent-grid{grid-template-columns:1fr}
  .form-row-2,.form-row-3{grid-template-columns:1fr}
}