*{box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{margin:0;font-family:Tahoma,Arial,sans-serif;background:#f4f6f9;color:#1f2937;overflow-x:hidden;max-width:100vw}
a{color:#2563eb}
.admin-topbar{height:64px;background:#111827;color:#fff;display:flex;align-items:center;gap:14px;padding:0 20px;position:sticky;top:0;z-index:50}
.admin-brand{color:#fff;text-decoration:none;font-size:19px;font-weight:700}
.admin-user{margin-right:auto;font-size:14px;color:#e5e7eb}
.menu-toggle{display:none;background:transparent;color:#fff;border:0;font-size:28px;cursor:pointer;padding:5px}
.admin-layout{display:flex;min-height:calc(100vh - 64px)}
.admin-sidebar{width:240px;flex:0 0 240px;background:#fff;border-left:1px solid #e5e7eb;padding:18px 12px;position:sticky;top:64px;height:calc(100vh - 64px);overflow-y:auto}
.sidebar-title{font-size:14px;font-weight:700;color:#6b7280;padding:8px 12px 14px}
.admin-sidebar nav{display:flex;flex-direction:column;gap:5px}
.admin-sidebar nav a{display:block;text-decoration:none;color:#374151;padding:12px;border-radius:9px}
.admin-sidebar nav a:hover,.admin-sidebar nav a.active{background:#eef2ff;color:#1d4ed8}
.admin-sidebar .logout-link{color:#b91c1c;margin-top:12px}
.admin-main{flex:1;min-width:0;padding:22px;max-width:1400px;margin:0 auto;width:100%}
.breadcrumb{display:flex;align-items:center;gap:8px;color:#6b7280;margin:0 0 18px;font-size:14px}
.breadcrumb a{text-decoration:none}.breadcrumb b{color:#111827}
.container{width:min(1100px,100%);margin:30px auto;padding:0 18px}
.card{background:#fff;border-radius:14px;padding:22px;box-shadow:0 4px 18px #0000000d;margin-bottom:18px}
.soft,.upload-box{background:#f8fafc;border-radius:12px;padding:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;border:0;border-radius:9px;padding:11px 18px;background:#2563eb;color:#fff;text-decoration:none;cursor:pointer;font:inherit;max-width:100%}
.btn.secondary{background:#6b7280}.btn.success{background:#059669}.btn.danger{background:#dc2626}.btn:disabled{opacity:.5;cursor:not-allowed}
.input,select,textarea{width:100%;max-width:100%;padding:11px;border:1px solid #d1d5db;border-radius:8px;margin:6px 0 14px;font:inherit;background:#fff}
textarea{min-height:100px;resize:vertical}label{font-weight:700;line-height:1.7}
.muted{color:#6b7280}.small{font-size:13px}
.table-wrap{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
.table{width:100%;min-width:650px;border-collapse:collapse}.table th,.table td{padding:11px;border-bottom:1px solid #e5e7eb;text-align:right;vertical-align:top}
.alert{padding:12px;border-radius:9px;background:#fee2e2;color:#991b1b;margin-bottom:15px}.successbox{padding:18px;border-radius:10px;background:#d1fae5;color:#065f46}
.actions{display:flex;gap:10px;flex-wrap:wrap}
.login{max-width:480px;margin:80px auto}
@media(max-width:800px){
 .menu-toggle{display:block}
 .admin-sidebar{position:fixed;right:0;top:64px;z-index:60;transform:translateX(110%);transition:transform .2s;width:min(290px,86vw);height:calc(100vh - 64px);box-shadow:-8px 0 25px #0002}
 body.nav-open .admin-sidebar{transform:translateX(0)}
 .nav-overlay{display:none;position:fixed;inset:64px 0 0;background:#0008;z-index:55}
 body.nav-open .nav-overlay{display:block}
 .admin-main{padding:14px 10px}
 .card{padding:16px;border-radius:12px}
 .admin-user{font-size:12px}
 .grid{grid-template-columns:1fr}
 .btn{min-height:46px}
 .actions .btn{flex:1 1 140px}
}
@media(max-width:480px){
 .admin-topbar{padding:0 12px}
 .admin-brand{font-size:16px}
 .card{padding:13px}
 .admin-main{padding:10px 8px}
 .btn{width:100%}
 .actions .btn{flex-basis:100%}
 .input,select,textarea{font-size:16px}
 .table{min-width:620px}
}

/* V7 admin navigation hardening */
.admin-layout{position:relative}
.admin-sidebar{display:block !important}
.admin-sidebar nav{display:flex !important;flex-direction:column !important}
.admin-sidebar nav a{display:block !important;text-decoration:none !important}
.nav-overlay{pointer-events:none}
@media (min-width:801px){
 .nav-overlay{display:none !important}
 .admin-sidebar{transform:none !important}
}
@media (max-width:800px){
 .menu-toggle{display:flex !important;align-items:center;justify-content:center}
 .admin-sidebar{display:block !important;position:fixed !important;right:0 !important;left:auto !important;top:64px !important;bottom:0 !important;width:min(290px,86vw) !important;height:auto !important;transform:translateX(110%) !important;z-index:1000 !important;overflow-y:auto !important;background:#fff !important;transition:transform .2s ease !important}
 body.nav-open .admin-sidebar{transform:translateX(0) !important}
 .nav-overlay{position:fixed !important;inset:64px 0 0 !important;z-index:999 !important;background:rgba(0,0,0,.45) !important}
 body:not(.nav-open) .nav-overlay{display:none !important}
 body.nav-open .nav-overlay{display:block !important;pointer-events:auto !important}
 .admin-main{position:relative !important;z-index:1 !important}
}

/* Stable V7 student UI */
.student-body{background:#f4f6f9;color:#1f2937}
.student-topbar{min-height:64px;background:#111827;color:#fff;display:flex;align-items:center;gap:16px;padding:12px max(14px,calc((100% - 1100px)/2));position:sticky;top:0;z-index:50}
.student-brand{color:#fff;text-decoration:none;font-weight:800;font-size:20px}.student-user{margin-right:auto;color:#e5e7eb}.student-logout{color:#fff;text-decoration:none;padding:8px 12px;border:1px solid #4b5563;border-radius:8px}
.student-main{width:min(1100px,100%);margin:0 auto;padding:16px}.student-breadcrumb{display:flex;gap:9px;align-items:center;margin:0 0 16px;color:#6b7280}.student-breadcrumb a{text-decoration:none}.student-breadcrumb b{color:#111827}
.subject-card{height:100%;display:flex;flex-direction:column}.subject-card .btn{margin-top:auto}.badge{display:inline-flex;align-items:center;padding:7px 10px;border-radius:999px;background:#e5e7eb;color:#374151;font-size:13px}.badge.ok{background:#d1fae5;color:#065f46}.stats{font-size:34px;font-weight:800;margin-top:8px}.empty-state{text-align:center;color:#6b7280}
.timer{position:sticky;top:76px;z-index:20;width:max-content;margin:0 0 12px auto;background:#111827;color:#fff;border-radius:12px;padding:10px 18px;font-size:22px;font-weight:800;box-shadow:0 4px 14px #0002}.exam-card{max-width:900px;margin-left:auto;margin-right:auto}.exam-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.exam-head h1{margin:0 0 6px}.exam-type{background:#eef2ff;color:#3730a3;padding:7px 10px;border-radius:8px;font-size:13px;font-weight:700;white-space:nowrap}.navq{display:flex;flex-wrap:wrap;gap:6px;margin:18px 0}.navq a{width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border:1px solid #d1d5db;border-radius:8px;text-decoration:none;color:#374151;background:#fff}.navq a.answered{background:#d1fae5;border-color:#86efac;color:#065f46}.navq a.current{outline:3px solid #bfdbfe}.question{font-size:22px;line-height:1.8;font-weight:700;background:#f8fafc;border-radius:12px;padding:18px;margin:12px 0}.options{display:grid;gap:10px}.option{display:flex;align-items:center;gap:10px;border:1px solid #d1d5db;border-radius:10px;padding:13px;background:#fff;cursor:pointer;font-weight:600}.option.selected{border-color:#2563eb;background:#eff6ff}.option input{width:20px;height:20px;flex:0 0 auto}.exam-actions{margin-top:16px}.finish-form{margin-top:14px}.exam-actions .btn,.finish-form .btn{min-width:150px}
@media(max-width:800px){.student-topbar{padding:10px 12px}.student-brand{font-size:17px}.student-main{padding:10px}.timer{top:70px;font-size:20px}.exam-head{flex-direction:column}.exam-type{align-self:flex-start}.question{font-size:19px}.navq a{width:34px;height:34px}.exam-actions .btn,.finish-form .btn{width:100%}}
@media(max-width:480px){.student-user{display:none}.student-logout{padding:7px 9px}.card{margin-bottom:12px}.question{font-size:18px;padding:14px}.option{padding:12px}.timer{font-size:18px}}


/* V7.3 Responsive Admin Layout - final hardening */
html,body{width:100%;max-width:100%;overflow-x:hidden}
.admin-topbar{width:100%;max-width:100vw;min-width:0;overflow:hidden}
.admin-layout{width:100%;max-width:100vw;min-width:0;overflow:visible}
.admin-main{min-width:0;max-width:none;width:100%;overflow:hidden}
.admin-main>*{max-width:100%}
.card{min-width:0;max-width:100%}
.grid{min-width:0}
.table-wrap{display:block;max-width:100%;min-width:0;overflow-x:auto;overflow-y:hidden}
.table-wrap .table{margin:0}
.actions{min-width:0}
.input,select,textarea{display:block;min-width:0}

@media (min-width:801px){
  .admin-layout{display:grid;grid-template-columns:240px minmax(0,1fr);align-items:start}
  .admin-sidebar{grid-column:1;grid-row:1;width:240px;max-width:240px;position:sticky;right:auto;left:auto}
  .admin-main{grid-column:2;grid-row:1;width:100%;max-width:none;padding:22px}
  .nav-overlay{display:none!important}
}

@media (max-width:800px){
  html,body{width:100%;max-width:100vw}
  body.nav-open{overflow:hidden}
  .admin-topbar{height:64px;padding:0 12px;gap:10px;position:sticky;top:0;z-index:1100}
  .admin-brand{font-size:17px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
  .admin-user{min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:12px}
  .menu-toggle{display:flex!important;flex:0 0 42px;width:42px;height:42px;align-items:center;justify-content:center;line-height:1}
  .admin-layout{display:block;width:100%;max-width:100vw;min-width:0}
  .admin-main{display:block;width:100%;max-width:100vw;min-width:0;padding:12px 10px;overflow:hidden}
  .admin-sidebar{position:fixed!important;top:64px!important;right:0!important;left:auto!important;bottom:0!important;width:min(300px,82vw)!important;max-width:300px!important;height:calc(100dvh - 64px)!important;transform:translate3d(110%,0,0)!important;z-index:1200!important;border:0!important;border-radius:0!important;box-shadow:-12px 0 32px rgba(0,0,0,.22)!important;overflow-y:auto!important;overflow-x:hidden!important;-webkit-overflow-scrolling:touch!important}
  body.nav-open .admin-sidebar{transform:translate3d(0,0,0)!important}
  .nav-overlay{position:fixed!important;top:64px!important;right:0!important;bottom:0!important;left:0!important;width:auto!important;height:auto!important;background:rgba(15,23,42,.48)!important;z-index:1150!important;display:none!important;pointer-events:none!important}
  body.nav-open .nav-overlay{display:block!important;pointer-events:auto!important}
  .admin-sidebar nav{gap:3px!important;padding-bottom:20px}
  .admin-sidebar nav a{padding:13px 14px!important;min-height:46px}
  .breadcrumb{flex-wrap:wrap;max-width:100%;overflow:hidden;line-height:1.7}
  .card{width:100%;max-width:100%;padding:15px;margin-bottom:12px;border-radius:12px;overflow:hidden}
  .actions .btn{width:auto;flex:1 1 160px}
  .table-wrap{margin:0 -2px;width:calc(100% + 4px)}
}

@media (max-width:480px){
  .admin-main{padding:9px 7px}
  .admin-topbar{padding:0 8px}
  .admin-brand{font-size:16px}
  .admin-user{font-size:11px}
  .card{padding:13px 11px}
  .actions{gap:8px}
  .actions .btn{flex-basis:100%;width:100%}
  .table{min-width:600px}
  h1{font-size:25px}h2{font-size:21px}h3{font-size:18px}
}


/* V7.4 table responsiveness - scoped to admin tables only */
.admin-main .table-wrap{
  width:100%;
  max-width:100%;
  min-width:0;
  overflow-x:auto;
  overflow-y:hidden;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}
.admin-main .table-wrap .table{
  width:100%;
  min-width:650px;
  margin:0;
}
.admin-main .table-wrap th,
.admin-main .table-wrap td{
  overflow-wrap:anywhere;
  word-break:normal;
}
.admin-main .table-wrap td form{max-width:100%;}
@media(max-width:800px){
  .admin-main .table-wrap{
    width:100%;
    max-width:100%;
    margin:0;
  }
  .admin-main .table-wrap .table{min-width:620px;}
  .admin-main .table-wrap th,
  .admin-main .table-wrap td{padding:9px 8px;font-size:14px;}
}
@media(max-width:480px){
  .admin-main .table-wrap .table{min-width:600px;}
  .admin-main .table-wrap th,
  .admin-main .table-wrap td{padding:8px 7px;font-size:13px;}
  .admin-main .table-wrap .actions{gap:6px;}
}