/* Admin theme */
:root{--ink:#0C1A26;--ink2:#14293D;--gold:#C2A05E;--line:#E4E9EF;--gray:#66727F;--bg:#F4F6F9;--az:#1F7AE0}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI',Arial,sans-serif;background:var(--bg);color:#1c2733;font-size:14px}
a{text-decoration:none;color:var(--az)}
.layout{display:flex;min-height:100vh}
.sidebar{width:230px;background:var(--ink);color:#B9C6D4;flex-shrink:0}
.sidebar .logo{display:flex;align-items:center;gap:10px;padding:18px 18px 16px;border-bottom:1px solid rgba(255,255,255,.08)}
.sidebar .logo img{width:38px;height:38px;background:#fff;border-radius:50%;padding:2px}
.sidebar .logo b{color:#fff;font-size:12.5px;letter-spacing:.5px}
.sidebar nav{padding:14px 0}
.sidebar nav a{display:block;color:#B9C6D4;padding:11px 20px;font-size:13.5px;border-left:3px solid transparent}
.sidebar nav a:hover,.sidebar nav a.on{background:rgba(255,255,255,.06);color:#fff;border-left-color:var(--gold)}
.sidebar .grp{padding:16px 20px 6px;font-size:10.5px;letter-spacing:1.5px;color:#5D7288;text-transform:uppercase}
.content{flex:1;padding:0}
.topbar{background:#fff;border-bottom:1px solid var(--line);padding:12px 26px;display:flex;justify-content:space-between;align-items:center}
.topbar .u{display:flex;align-items:center;gap:10px}
.topbar .u img{width:34px;height:34px;border-radius:50%;object-fit:cover;border:1px solid var(--line)}
.main{padding:26px}
h1.pg{font-size:21px;margin-bottom:18px;color:var(--ink)}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:22px;margin-bottom:22px}
.card h2{font-size:15px;margin-bottom:16px;color:var(--ink)}
table.grid{width:100%;border-collapse:collapse;background:#fff}
table.grid th{background:#F0F3F7;text-align:left;padding:10px 12px;font-size:12px;text-transform:uppercase;letter-spacing:.5px;color:var(--gray);border-bottom:1px solid var(--line)}
table.grid td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:middle}
table.grid tr:hover td{background:#F8FAFC}
.form-row{margin-bottom:14px}
.form-row label{display:block;font-size:12.5px;font-weight:600;color:var(--gray);margin-bottom:6px}
input[type=text],input[type=password],input[type=email],input[type=date],select,textarea{
 width:100%;padding:9px 12px;border:1px solid #CBD5E0;border-radius:6px;font-size:14px;font-family:inherit;background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--az)}
.btn{display:inline-block;background:var(--az);color:#fff!important;border:none;padding:10px 22px;border-radius:6px;font-size:13.5px;cursor:pointer}
.btn:hover{background:#1668c4}
.btn.gold{background:var(--gold)}
.btn.gray{background:#8A97A5}
.btn.red{background:#D64545}
.btn.sm{padding:6px 12px;font-size:12.5px}
.msg{padding:11px 16px;border-radius:6px;margin-bottom:16px;font-size:13.5px}
.msg.ok{background:#E6F6EC;color:#1E7B3C;border:1px solid #BFE5CC}
.msg.err{background:#FDECEC;color:#B02A2A;border:1px solid #F2C6C6}
.badge{display:inline-block;padding:3px 10px;border-radius:12px;font-size:11.5px}
.badge.admin{background:#FDF3E0;color:#A5854A}
.badge.user{background:#E8F1FD;color:#1F6FD0}
.badge.on{background:#E6F6EC;color:#1E7B3C}
.badge.off{background:#FDECEC;color:#B02A2A}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.media-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.media-item{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;font-size:11.5px}
.media-item .th{height:105px;background:#EEF1F5;display:flex;align-items:center;justify-content:center;overflow:hidden}
.media-item .th img{width:100%;height:100%;object-fit:cover}
.media-item .inf{padding:8px 10px;word-break:break-all}
.avatar-lg{width:90px;height:90px;border-radius:50%;object-fit:cover;border:2px solid var(--line)}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--ink)}
.login-box{background:#fff;border-radius:12px;padding:38px 36px;width:380px}
.login-box .lg{text-align:center;margin-bottom:22px}
.login-box .lg img{width:64px;height:64px}
.login-box h1{font-size:17px;text-align:center;color:var(--ink);margin-bottom:20px}

/* ---- huong dan nhanh moi module ---- */
details.help{background:#EFF6FF;border:1px solid #BFDBFE;border-radius:8px;margin-bottom:18px;font-size:13px}
details.help summary{cursor:pointer;padding:10px 16px;font-weight:600;color:#1D4ED8;user-select:none}
details.help summary:before{content:"💡 "}
details.help .bd{padding:2px 18px 14px;color:#334155}
details.help ol{margin:4px 0 4px 18px;line-height:1.9}
details.help b{color:#0C1A26}