/* Octix Admin — night sidebar, light work surface; tokens from the Octix design system. */
:root{
  --night:#0B0F2E; --night-2:#141A45; --on-night:#FFFFFF; --lime:#C8F31D; --on-lime:#0D1233; --mint:#3CF0C8; --sky:#5FC8FF; --brand:#2440F0;
  --bg:#F5F7FF; --card:#FFFFFF; --fg:#0D1233; --muted:#5A6187; --line:#DDE2F5; --chip:#E9EDFF; --hover:#EEF1FF;
  --ok:#0E8A5F; --ok-bg:#DDF6EC; --warn:#9A5B00; --warn-bg:#FFF1D6; --bad:#B4231A; --bad-bg:#FDE4E2; --info:#1D4ED8; --info-bg:#E0E9FF;
  --f-display:"Lexend","Be Vietnam Pro",system-ui,sans-serif; --f-body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --r:14px; --r-lg:20px;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root{
  --bg:#080B22; --card:#11163A; --fg:#E8EBFF; --muted:#9AA2CC; --line:#242B5C; --chip:#1C2350; --hover:#182055; --brand:#8D9BFF;
  --ok:#5BE0A8; --ok-bg:#0F3A2B; --warn:#FFC266; --warn-bg:#3A2A0C; --bad:#FF8A80; --bad-bg:#3D1512; --info:#9DB6FF; --info-bg:#16235A; color-scheme:dark}}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--fg);font-family:var(--f-body);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--brand)}
h1,h2,h3{font-family:var(--f-display);letter-spacing:-.01em;margin:0;text-wrap:balance}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:8px}
.boot{display:grid;place-items:center;height:100%}
.boot-msg{color:var(--muted)}

/* ---------- login ---------- */
.login{min-height:100vh;min-height:100dvh;display:grid;place-items:center;background:var(--night);color:var(--on-night);padding:24px max(16px,env(safe-area-inset-left,0px));position:relative;overflow:hidden}
.login::before{content:"";position:absolute;width:620px;height:620px;right:-200px;top:-220px;border-radius:50%;background:radial-gradient(closest-side,rgba(60,240,200,.25),transparent)}
.login-card{position:relative;width:min(400px,100%);display:flex;flex-direction:column;gap:16px}
.login-card img{height:46px;align-self:flex-start}
.login-card h1{font-size:28px}
.login-card p{margin:0;color:#C9D0F5}
.login-card input{width:100%;padding:13px 16px;border-radius:999px;border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.06);color:#fff}
.login-card .msg{font-size:14px;min-height:20px}

/* ---------- shell ---------- */
.shell{display:grid;grid-template-columns:232px 1fr;min-height:100%}
.side{background:var(--night);color:var(--on-night);padding:20px 14px;display:flex;flex-direction:column;gap:6px;position:sticky;top:0;height:100vh}
.side .logo{display:flex;align-items:center;gap:10px;padding:4px 8px 18px}
.side .logo img{height:26px}
.side .logo span{font-family:var(--f-display);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--lime)}
.nav a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;color:#D8DDF8;text-decoration:none;font-weight:500}
.nav a:hover{background:rgba(255,255,255,.06)}
.nav a[aria-current="page"]{background:rgba(200,243,29,.14);color:var(--lime)}
.nav svg{width:18px;height:18px;flex:none}
.nav .count{margin-left:auto;font-size:12px;font-weight:700;background:var(--lime);color:var(--on-lime);border-radius:999px;padding:1px 8px}
.side .me{margin-top:auto;font-size:13px;color:#A9B0D6;padding:10px 12px;display:flex;flex-direction:column;gap:6px;overflow-wrap:anywhere}
.side .me button{align-self:flex-start;background:transparent;border:1px solid rgba(255,255,255,.2);color:#fff;border-radius:999px;padding:5px 12px;cursor:pointer;font-size:13px}
.main{min-width:0;padding:24px max(16px,env(safe-area-inset-right,0px)) 80px max(16px,env(safe-area-inset-left,0px))}
.main-in{max-width:1180px;margin:0 auto;display:flex;flex-direction:column;gap:18px}
.head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px}
.head h1{font-size:26px}
.head p{margin:2px 0 0;color:var(--muted)}
.tabbar{display:none}

/* ---------- controls ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;border:0;border-radius:999px;padding:9px 16px;cursor:pointer;font-weight:600;font-family:var(--f-display);font-size:14px;background:var(--chip);color:var(--fg);text-decoration:none;white-space:nowrap}
.btn:hover{filter:brightness(.97)}
.btn.primary{background:var(--lime);color:var(--on-lime)}
.btn.dark{background:var(--fg);color:var(--bg)}
.btn.ghost{background:transparent;border:1px solid var(--line)}
.btn.danger{background:var(--bad-bg);color:var(--bad)}
.btn.sm{padding:5px 11px;font-size:13px}
.btn:disabled{opacity:.5;cursor:default}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.toolbar input[type=search],.toolbar select{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:var(--card);min-width:0}
.toolbar input[type=search]{flex:1 1 220px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips button{border:1px solid var(--line);background:var(--card);border-radius:999px;padding:6px 12px;cursor:pointer;font-size:13px;font-weight:500}
.chips button[aria-pressed="true"]{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.chips button .n{opacity:.6;margin-left:4px;font-variant-numeric:tabular-nums}

/* ---------- cards / stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:16px 18px;display:flex;flex-direction:column;gap:4px;min-width:0;text-decoration:none;color:var(--fg)}
.stat b{font-family:var(--f-display);font-size:28px;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.1}
.stat span{color:var(--muted);font-size:13px}
.stat.hl{background:var(--night);color:var(--on-night);border-color:var(--night)}
.stat.hl span{color:#C9D0F5}.stat.hl b{color:var(--lime)}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:16px 18px;display:flex;flex-direction:column;gap:12px;min-width:0}
.panel h2{font-size:16px}
.bars{display:flex;flex-direction:column;gap:8px}
.bar-row{display:grid;grid-template-columns:110px 1fr 36px;gap:10px;align-items:center;font-size:14px}
.bar-row .track{height:10px;border-radius:999px;background:var(--chip);overflow:hidden}
.bar-row .track i{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--lime),var(--mint))}
.bar-row b{font-variant-numeric:tabular-nums;text-align:right}
.empty{color:var(--muted);padding:18px;text-align:center;border:1px dashed var(--line);border-radius:var(--r);background:var(--card)}

/* ---------- table ---------- */
.tbl-wrap{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:14px}
th{text-align:left;font-weight:600;color:var(--muted);font-size:12px;letter-spacing:.06em;text-transform:uppercase;padding:10px 12px;border-bottom:1px solid var(--line);white-space:nowrap}
td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
tbody tr:hover{background:var(--hover)}
td .sub{color:var(--muted);font-size:13px}
td.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.cell-actions{display:flex;gap:6px;justify-content:flex-end;flex-wrap:wrap}
.phone{font-variant-numeric:tabular-nums;white-space:nowrap}
select.status{border:1px solid var(--line);border-radius:999px;padding:4px 8px;background:var(--card);font-size:13px;font-weight:600}
.pill{display:inline-block;font-size:12px;font-weight:600;padding:2px 9px;border-radius:999px;background:var(--chip);color:var(--fg);white-space:nowrap}
.pill.ok{background:var(--ok-bg);color:var(--ok)}.pill.warn{background:var(--warn-bg);color:var(--warn)}.pill.bad{background:var(--bad-bg);color:var(--bad)}.pill.info{background:var(--info-bg);color:var(--info)}
.st-moi{background:var(--info-bg);color:var(--info)}.st-da_goi{background:var(--chip)}.st-hen_hoc_thu{background:var(--warn-bg);color:var(--warn)}
.st-da_hoc_thu{background:var(--warn-bg);color:var(--warn)}.st-dang_ky{background:var(--ok-bg);color:var(--ok)}.st-khong_theo{background:var(--chip);color:var(--muted)}
.overdue{color:var(--bad);font-weight:600}

/* ---------- class cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.ccard{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:16px 18px;display:flex;flex-direction:column;gap:8px}
.ccard h3{font-size:18px}
.ccard .meta{color:var(--muted);font-size:14px}
.seat{height:8px;border-radius:999px;background:var(--chip);overflow:hidden}.seat i{display:block;height:100%;background:var(--lime)}

/* ---------- tasks ---------- */
.tgroup{display:flex;flex-direction:column;gap:6px}
.tgroup h2{font-size:15px;display:flex;justify-content:space-between;padding-inline:4px}
.tgroup h2 span{color:var(--muted);font-weight:500;font-size:13px}
.tlist{list-style:none;margin:0;padding:0;background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.tlist li{display:grid;grid-template-columns:auto 1fr auto;gap:12px;padding:10px 14px;border-top:1px solid var(--line);align-items:start}
.tlist li:first-child{border-top:0}
.chk{width:22px;height:22px;border-radius:7px;border:2px solid var(--line);background:transparent;cursor:pointer;display:grid;place-items:center;padding:0;color:var(--on-lime)}
.chk[aria-checked="true"]{background:var(--lime);border-color:var(--lime)}
.chk svg{opacity:0}.chk[aria-checked="true"] svg{opacity:1}
.tlist .done .ttl{text-decoration:line-through;color:var(--muted)}
.tlist .note{font-size:13px;color:var(--muted)}

/* ---------- docs ---------- */
.links{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.links a{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:14px 16px;text-decoration:none;color:var(--fg);display:flex;flex-direction:column;gap:2px}
.links a:hover{border-color:var(--brand)}
.links b{font-family:var(--f-display);font-weight:600}
.links span{color:var(--muted);font-size:13px}

/* ---------- modal ---------- */
.overlay{position:fixed;inset:0;background:rgba(5,8,30,.55);display:grid;place-items:center;padding:16px;z-index:50}
.modal{background:var(--card);color:var(--fg);border-radius:var(--r-lg);width:min(560px,100%);max-height:calc(100vh - 32px);overflow:auto;padding:20px;display:flex;flex-direction:column;gap:14px;box-shadow:0 20px 60px rgba(0,0,0,.35)}
.modal h2{font-size:20px}
.form{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.form label{display:flex;flex-direction:column;gap:4px;font-size:13px;font-weight:600;color:var(--muted);min-width:0}
.form label.full{grid-column:1/-1}
.form input,.form select,.form textarea{padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg);font-weight:400;font-size:15px;width:100%}
.form textarea{min-height:70px;resize:vertical}
.form .check{flex-direction:row;align-items:center;gap:8px;color:var(--fg)}
.form .check input{width:auto}
.modal .actions{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap}
.modal .actions .r{display:flex;gap:8px;margin-left:auto}
#toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--fg);color:var(--bg);padding:10px 18px;border-radius:999px;font-weight:600;z-index:60;max-width:calc(100% - 32px)}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .shell{grid-template-columns:1fr}
  .side{display:none}
  .main{padding-bottom:calc(90px + env(safe-area-inset-bottom,0px))}
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;background:var(--night);padding:6px max(6px,env(safe-area-inset-left,0px)) calc(6px + env(safe-area-inset-bottom,0px));gap:2px;z-index:40;overflow-x:auto}
  .tabbar a{flex:1 1 0;min-width:0;display:flex;flex-direction:column;align-items:center;gap:2px;color:#C9D0F5;text-decoration:none;font-size:10.5px;white-space:nowrap;padding:6px 2px;border-radius:10px}
  .tabbar a[aria-current="page"]{color:var(--lime);background:rgba(200,243,29,.12)}
  .tabbar svg{width:20px;height:20px}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid2{grid-template-columns:1fr}
  .form{grid-template-columns:1fr}
  .hide-sm{display:none}
  #toast{bottom:calc(84px + env(safe-area-inset-bottom,0px))!important}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}