@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&family=Space+Grotesk:wght@500;600;700&display=swap');

:root{
  --bg:#eef5ff;
  --bg-soft:#f7fbff;
  --surface:rgba(255,255,255,.86);
  --surface-2:rgba(255,255,255,.96);
  --line:rgba(34,60,95,.1);
  --line-strong:rgba(34,60,95,.18);
  --text:#0d1d32;
  --muted:#5c6f86;
  --primary:#007fbb;
  --primary-2:#5a4de8;
  --green:#119f67;
  --red:#d94162;
  --yellow:#c58b00;
  --shadow:0 24px 60px rgba(38,69,103,.13);
}

[data-theme="dark"]{
  --bg:#07111f;
  --bg-soft:#0b1728;
  --surface:rgba(12,27,46,.78);
  --surface-2:rgba(15,34,57,.92);
  --line:rgba(148,183,219,.12);
  --line-strong:rgba(148,183,219,.2);
  --text:#f2f7ff;
  --muted:#93a7bf;
  --primary:#55d6ff;
  --primary-2:#7c6cff;
  --green:#58e6a1;
  --red:#ff718f;
  --yellow:#ffd166;
  --shadow:0 24px 70px rgba(0,0,0,.28);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:'Be Vietnam Pro',sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at 12% 10%,rgba(85,214,255,.07),transparent 28%),
    radial-gradient(circle at 88% 15%,rgba(124,108,255,.09),transparent 24%),
    var(--bg);
  min-height:100vh;
  overflow-x:hidden;
}
button,input{font:inherit}
a{text-decoration:none;color:inherit}

.page-noise{
  position:fixed;
  inset:0;
  pointer-events:none;
  opacity:.025;
  z-index:0;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.glass-nav{
  background:color-mix(in srgb,var(--bg) 70%,transparent);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border-bottom:1px solid var(--line);
  z-index:20;
}
.navbar{padding:12px 0}
.brand-wrap{display:flex;align-items:center;gap:10px}
.brand-logo{
  width:42px;height:42px;border-radius:14px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,rgba(85,214,255,.16),rgba(124,108,255,.15));
  border:1px solid var(--line-strong);
  box-shadow:0 10px 28px rgba(0,0,0,.18);
  overflow:hidden;
}
.brand-logo img{width:31px;height:31px;object-fit:contain}
.brand-wrap strong{
  display:block;
  font-family:'Space Grotesk',sans-serif;
  letter-spacing:.2px;
  line-height:1;
}
.brand-wrap small{
  display:block;
  margin-top:3px;
  font-size:9px;
  color:var(--muted);
  letter-spacing:1.4px;
}
.nav-link{
  color:var(--muted);
  font-size:13px;
  border-radius:999px;
  padding:9px 12px!important;
  transition:.25s ease;
}
.nav-link:hover{color:var(--text);background:rgba(127,160,195,.08);transform:translateY(-1px)}
.theme-toggle{
  width:40px;height:40px;border-radius:13px;
  border:1px solid var(--line-strong);
  background:var(--surface);
  color:var(--text);
  display:grid;place-items:center;
  transition:.25s ease;
}
.theme-toggle:hover{transform:rotate(-8deg) scale(1.05);border-color:rgba(85,214,255,.38)}

.hero-section{
  position:relative;
  padding:145px 0 38px;
  isolation:isolate;
  overflow:hidden;
}
.hero-section:after{
  content:'';
  position:absolute;
  left:8%;right:8%;bottom:0;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--line-strong),transparent);
}
.hero-glow{
  position:absolute;
  width:420px;height:420px;
  border-radius:50%;
  filter:blur(80px);
  opacity:.13;
  pointer-events:none;
}
.glow-a{background:var(--primary);left:-180px;top:10px}
.glow-b{background:var(--primary-2);right:-200px;top:50px}

.eyebrow,.panel-kicker,.stat-label,.class-card-label{
  font-size:10px;
  letter-spacing:1.8px;
  font-weight:800;
  color:var(--muted);
}
.hero-title{
  font-family:'Space Grotesk',sans-serif;
  font-size:clamp(48px,8vw,88px);
  line-height:.98;
  letter-spacing:-3.5px;
  margin:15px 0 20px;
  max-width:900px;
}
.hero-title span{
  background:linear-gradient(120deg,var(--primary),#9a8fff 75%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-subtitle{
  color:var(--muted);
  max-width:720px;
  line-height:1.9;
  font-size:15px;
  margin:0;
}

.class-card{
  display:flex;
  align-items:center;
  gap:15px;
  padding:17px 18px;
  border:1px solid var(--line-strong);
  border-radius:22px;
  background:linear-gradient(135deg,rgba(85,214,255,.08),rgba(124,108,255,.08)),var(--surface);
  box-shadow:var(--shadow);
  position:relative;
  overflow:hidden;
}
.class-card:before{
  content:'';
  position:absolute;
  inset:0;
  background:linear-gradient(120deg,transparent,rgba(255,255,255,.06),transparent);
  transform:translateX(-100%);
  transition:.7s ease;
}
.class-card:hover:before{transform:translateX(100%)}
.pulse-dot{
  width:11px;height:11px;border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 6px rgba(88,230,161,.09),0 0 25px rgba(88,230,161,.5);
}
.class-card-name{
  font-family:'Space Grotesk',sans-serif;
  font-size:28px;
  font-weight:700;
  margin-top:3px;
}
.class-card-icon{
  margin-left:auto;
  width:48px;height:48px;border-radius:15px;
  display:grid;place-items:center;
  background:rgba(85,214,255,.1);
  color:var(--primary);
  font-size:22px;
}

.filter-bar{
  margin-top:36px;
  display:flex;
  justify-content:space-between;
  gap:15px;
  flex-wrap:wrap;
  align-items:center;
  border:1px solid var(--line);
  border-radius:16px;
  background:rgba(255,255,255,.58);
  padding:9px 11px;
  backdrop-filter:blur(10px);
}
[data-theme="dark"] .filter-bar{background:rgba(9,23,39,.55)}
.filter-left,.filter-right{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.filter-left{font-size:12px;color:var(--muted);padding-left:7px}
.filter-left strong{color:var(--text)}
.live-dot{
  width:7px;height:7px;border-radius:50%;background:var(--green);
  box-shadow:0 0 0 5px rgba(88,230,161,.09);
}
.period-btn{
  border:0;
  color:var(--muted);
  background:transparent;
  border-radius:10px;
  padding:8px 12px;
  font-size:12px;
  font-weight:700;
  transition:.25s ease;
}
.period-btn:hover{color:var(--text);background:rgba(127,160,195,.08)}
.period-btn.active{
  color:var(--text);
  background:rgba(85,214,255,.1);
  box-shadow:inset 0 0 0 1px rgba(85,214,255,.18);
}
.updated{font-size:11px;color:var(--muted);padding:0 7px 0 3px}

.stats-section{padding:24px 0}
.stat-card,.panel-card{
  position:relative;
  background:linear-gradient(145deg,rgba(255,255,255,.025),transparent 45%),var(--surface);
  border:1px solid var(--line);
  box-shadow:var(--shadow);
  backdrop-filter:blur(14px);
}
.stat-card{
  min-height:185px;
  padding:22px;
  border-radius:22px;
  overflow:hidden;
  transition:.35s ease;
}
.stat-card:after{
  content:'';
  position:absolute;
  width:160px;height:160px;
  right:-80px;top:-80px;
  border-radius:50%;
  background:rgba(85,214,255,.08);
  filter:blur(2px);
}
.stat-card:hover{transform:translateY(-5px);border-color:var(--line-strong)}
.stat-main{border-color:rgba(85,214,255,.2)}
.stat-icon{
  width:42px;height:42px;
  border-radius:14px;
  display:grid;place-items:center;
  color:var(--primary);
  background:rgba(85,214,255,.1);
  margin-bottom:18px;
}
.stat-icon.green{color:var(--green);background:rgba(88,230,161,.1)}
.stat-icon.red{color:var(--red);background:rgba(255,113,143,.1)}
.stat-icon.blue{color:#95a8ff;background:rgba(124,108,255,.12)}
.stat-label{margin-bottom:3px}
.stat-value{
  font-family:'Space Grotesk',sans-serif;
  font-size:43px;
  font-weight:700;
  letter-spacing:-1.5px;
}
.stat-note{font-size:11px;margin-top:4px}
.positive{color:var(--green)!important}
.negative{color:var(--red)!important}

.content-section{padding:12px 0 30px}
.panel-card{border-radius:25px;padding:25px}
.panel-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:18px;
  margin-bottom:18px;
}
.panel-head h2{
  font-family:'Space Grotesk',sans-serif;
  font-size:20px;
  margin:6px 0 4px;
  letter-spacing:-.5px;
}
.panel-head p{margin:0;color:var(--muted);font-size:12px}
.trend-badge,.mini-badge{
  white-space:nowrap;
  border-radius:999px;
  padding:7px 10px;
  font-size:10px;
  font-weight:800;
  color:var(--green);
  background:rgba(88,230,161,.09);
  border:1px solid rgba(88,230,161,.13);
}
.mini-badge{color:var(--primary);background:rgba(85,214,255,.09);border-color:rgba(85,214,255,.15)}
.chart-wrap{height:295px;position:relative}
.legend-row{
  display:flex;justify-content:space-between;gap:12px;
  color:var(--muted);font-size:11px;margin-top:7px;
}
.legend-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--primary);margin-right:6px}
.rank-list{display:flex;flex-direction:column;gap:8px;margin-top:6px}
.rank-row{
  display:grid;
  grid-template-columns:48px 1fr auto;
  gap:10px;
  align-items:center;
  padding:13px 12px;
  border-radius:16px;
  transition:.25s ease;
}
.rank-row.faded{color:var(--muted)}
.rank-row:hover{background:rgba(127,160,195,.055);transform:translateX(2px)}
.rank-row.current{
  background:linear-gradient(90deg,rgba(85,214,255,.12),rgba(124,108,255,.08));
  border:1px solid rgba(85,214,255,.15);
  color:var(--text);
}
.rank-number{font-family:'Space Grotesk',sans-serif;font-size:16px;font-weight:700}
.rank-number.crown{color:var(--yellow)}
.rank-name strong{display:block;font-size:13px}
.rank-name small{display:block;color:var(--muted);font-size:10px;margin-top:2px}
.rank-score{font-family:'Space Grotesk',sans-serif;font-weight:700}
.rank-foot{
  border-top:1px solid var(--line);
  margin-top:14px;padding-top:14px;
  display:flex;justify-content:space-between;
  color:var(--muted);font-size:11px;
}
.rank-foot strong{color:var(--green)}

.compact{margin-bottom:13px}
.panel-head-icon{color:var(--primary);opacity:.75;font-size:20px}
.donut-layout{display:grid;grid-template-columns:165px 1fr;align-items:center;gap:10px;margin-top:4px}
.donut{
  width:150px;height:150px;border-radius:50%;
  display:grid;place-items:center;
  margin:auto;
  background:conic-gradient(var(--primary) var(--p),rgba(148,183,219,.1) 0);
  position:relative;
}
.donut:after{
  content:'';
  position:absolute;inset:13px;border-radius:50%;background:var(--bg-soft);
}
.donut-inner{z-index:1;text-align:center}
.donut-inner strong{display:block;font-family:'Space Grotesk';font-size:30px}
.donut-inner span{font-size:10px;color:var(--muted)}
.breakdown-list{display:flex;flex-direction:column;gap:12px}
.breakdown-item{display:flex;justify-content:space-between;gap:10px;font-size:12px;color:var(--muted)}
.breakdown-item strong{color:var(--text);font-family:'Space Grotesk'}
.breakdown-item i{
  display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:7px;
}
.dot-plus{background:var(--green)}
.dot-blue{background:var(--primary)}
.dot-red{background:var(--red)}
.dot-purple{background:var(--primary-2)}

.icon-btn{
  width:38px;height:38px;border-radius:12px;
  border:1px solid var(--line);
  color:var(--muted);
  background:rgba(127,160,195,.04);
  transition:.25s ease;
}
.icon-btn:hover{transform:translate(2px,-2px);color:var(--text);border-color:var(--line-strong)}
.activity-list{display:flex;flex-direction:column}
.activity-item{
  display:grid;
  grid-template-columns:40px 1fr auto;
  gap:12px;
  padding:14px 0;
  border-top:1px solid var(--line);
}
.activity-item:first-child{border-top:0;padding-top:4px}
.activity-icon{
  width:38px;height:38px;border-radius:12px;
  display:grid;place-items:center;
}
.activity-icon.success{background:rgba(88,230,161,.1);color:var(--green)}
.activity-icon.warning{background:rgba(255,209,102,.1);color:var(--yellow)}
.activity-icon.info{background:rgba(85,214,255,.1);color:var(--primary)}
.activity-top{display:flex;justify-content:space-between;gap:12px}
.activity-top strong{font-size:12px}
.activity-top span{font-size:10px;color:var(--muted);white-space:nowrap}
.activity-content p{font-size:11px;line-height:1.55;color:var(--muted);margin:5px 0 0}
.activity-points{font-family:'Space Grotesk',sans-serif;font-size:13px;font-weight:700;padding-top:2px;white-space:nowrap}

.search-box{
  min-width:250px;
  height:42px;
  display:flex;align-items:center;gap:8px;
  border:1px solid var(--line);
  border-radius:13px;
  background:rgba(127,160,195,.035);
  padding:0 12px;
}
.search-box i{color:var(--muted)}
.search-box input{
  width:100%;
  background:transparent;
  border:0;outline:0;
  color:var(--text);
  font-size:12px;
}
.search-box input::placeholder{color:var(--muted)}

.table-custom{--bs-table-bg:transparent;--bs-table-color:var(--text);--bs-table-border-color:var(--line)}
.table-custom thead th{
  color:var(--muted);
  font-size:10px;
  letter-spacing:1.2px;
  font-weight:800;
  border-bottom:1px solid var(--line-strong);
  padding:14px 12px;
}
.table-custom tbody td{
  padding:15px 12px;
  font-size:11px;
  color:var(--muted);
  border-color:var(--line);
}
.table-custom tbody tr{transition:.22s ease}
.table-custom tbody tr:hover{background:rgba(127,160,195,.045)}
.person-cell{display:flex;align-items:center;gap:10px}
.person-cell strong{display:block;color:var(--text);font-size:12px}
.person-cell small{display:block;color:var(--muted);font-size:9px;margin-top:2px}
.avatar{
  width:34px;height:34px;border-radius:11px;
  display:grid;place-items:center;
  color:white;font-weight:800;font-size:11px;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.12);
}
.avatar-a{background:linear-gradient(135deg,#087fda,#5e56e9)}
.avatar-b{background:linear-gradient(135deg,#0ca678,#067a9d)}
.avatar-c{background:linear-gradient(135deg,#a05fff,#d744a3)}
.avatar-d{background:linear-gradient(135deg,#e48c18,#d93f6a)}
.tag{display:inline-flex;align-items:center;border-radius:999px;padding:5px 8px;font-size:9px;font-weight:700;border:1px solid}
.tag-warning{color:var(--yellow);background:rgba(255,209,102,.08);border-color:rgba(255,209,102,.15)}
.tag-danger{color:var(--red);background:rgba(255,113,143,.08);border-color:rgba(255,113,143,.14)}
.points-minus{font-family:'Space Grotesk',sans-serif;color:var(--red)!important;font-weight:700}
.empty-search{
  min-height:180px;
  display:flex;align-items:center;justify-content:center;
  flex-direction:column;gap:5px;
  color:var(--muted);border-top:1px solid var(--line);
}
.empty-search i{font-size:24px;margin-bottom:6px}
.empty-search strong{color:var(--text);font-size:13px}
.empty-search span{font-size:11px}

.data-state{
  min-height:145px;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:7px;
  color:var(--muted);
  text-align:center;
  font-size:12px;
}
.data-state i{font-size:25px;color:var(--primary)}
.data-state strong{color:var(--text);font-size:13px}
.chart-wrap .data-state{position:absolute;inset:0;background:var(--surface);border-radius:15px}
.chart-wrap .data-state.d-none{display:none}
.data-value{font-variant-numeric:tabular-nums}

/* Các khu vực quản lý lớp */
.brand-wrap strong{color:var(--text)}
[data-theme="dark"] .brand-wrap strong{color:#fff}
button.nav-link{border:0;background:transparent}
.app-tab.active{color:var(--text);background:rgba(0,127,187,.1);box-shadow:inset 0 0 0 1px rgba(0,127,187,.18)}
.page-section{padding:125px 0 56px;min-height:calc(100vh - 82px)}
.page-heading{display:flex;justify-content:space-between;gap:28px;align-items:flex-end;margin-bottom:28px}
.page-heading h1{font-family:'Space Grotesk',sans-serif;font-size:clamp(38px,5vw,64px);line-height:1;letter-spacing:-2px;margin:12px 0}
.page-heading p{color:var(--muted);max-width:660px;margin:0;line-height:1.75;font-size:14px}
.roster-head-actions{display:flex;align-items:center;gap:7px}.mini-add-student{width:29px;height:29px;border:1px solid var(--line-strong);border-radius:9px;background:var(--surface);color:var(--primary);font-size:13px}.mini-add-student:hover{background:rgba(0,127,187,.1)}
.admin-indicator{font-size:11px;font-weight:800;letter-spacing:.7px;padding:8px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);white-space:nowrap}
.admin-indicator.is-admin{color:var(--green);border-color:rgba(17,159,103,.28);background:rgba(17,159,103,.08)}
.backend-alert{border:1px solid rgba(197,139,0,.26);background:rgba(255,209,102,.1);color:var(--yellow);border-radius:14px;padding:12px 14px;display:flex;gap:9px;align-items:flex-start;font-size:13px;margin:-8px 0 18px}
.seating-layout{display:grid;grid-template-columns:minmax(230px,280px) 1fr;gap:24px;align-items:start}
.roster-panel{position:sticky;top:98px;padding:20px;max-height:calc(100vh - 120px);overflow:auto}
.student-roster{display:flex;flex-direction:column;gap:8px}
.student-chip{width:100%;display:flex;align-items:center;gap:9px;text-align:left;padding:8px;border:1px solid transparent;border-radius:13px;color:var(--text);background:transparent;transition:.2s ease;cursor:pointer}
.student-chip:hover{background:rgba(0,127,187,.07);border-color:var(--line)}
.student-chip.is-selected,.seat-student.is-selected{outline:2px solid var(--primary);outline-offset:2px;background:rgba(0,127,187,.1);border-radius:10px}
.student-chip[draggable="true"]{cursor:grab}.student-chip[draggable="true"]:active{cursor:grabbing}
.student-avatar{width:32px;height:32px;object-fit:cover;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;display:grid;place-items:center;font-size:11px;font-weight:800;flex:0 0 auto}
.student-chip-text{min-width:0;flex:1}.student-chip-text strong{display:block;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.student-chip-text small{font-size:10px;color:var(--muted)}
.classroom-panel{min-height:600px;padding:24px;overflow:hidden}
.classroom-front{margin:0 auto 32px;width:min(430px,90%);padding:11px;text-align:center;border:1px solid var(--line-strong);border-radius:12px;background:linear-gradient(100deg,rgba(0,127,187,.1),rgba(90,77,232,.1));font-size:11px;font-weight:800;letter-spacing:1.8px;color:var(--primary)}
.groups-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.groups-grid>.data-state{grid-column:1/-1;min-height:420px}
.group-card{border:1px solid var(--line);border-radius:18px;padding:14px;background:rgba(127,160,195,.035)}
.group-label{display:flex;align-items:center;justify-content:space-between;color:var(--text);font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:15px;margin-bottom:12px}.group-label small{font-family:'Be Vietnam Pro',sans-serif;color:var(--muted);font-size:10px}
.desks{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}
.desk{min-width:0;border:1px solid var(--line);border-radius:11px;padding:5px;background:var(--bg-soft);position:relative}.desk:before{content:attr(data-desk);position:absolute;right:5px;top:3px;color:var(--muted);font-size:8px;font-weight:800}
.seat{min-height:72px;display:flex;align-items:center;justify-content:center;text-align:center;border-radius:8px;font-size:10px;font-weight:700;padding:4px;word-break:break-word;cursor:pointer;transition:.2s ease}.seat:first-child{border-bottom:1px dashed var(--line)}
.seat.empty{color:var(--muted);font-weight:500}.seat.drag-over{outline:2px solid var(--primary);background:rgba(0,127,187,.11)}.seat .student-avatar{width:23px;height:23px;border-radius:7px;font-size:8px;margin:0 auto 3px}.seat-name{display:block;line-height:1.25}
.admin-seat-actions{display:flex;justify-content:flex-end;align-items:center;gap:8px;margin-top:22px}.seat-touch-note{font-size:10px;color:var(--muted);margin-right:auto}.seat-touch-note i{color:var(--primary)}
.score-button{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:8px;width:27px;height:27px;font-weight:800;transition:.2s}.score-button.plus:hover{color:var(--green);border-color:var(--green)}.score-button.minus:hover{color:var(--red);border-color:var(--red)}
.admin-trigger-one{position:fixed;width:8px;height:8px;right:2px;bottom:2px;opacity:.025;border:0;background:var(--text);border-radius:50%;z-index:100}.admin-trigger-one:focus{opacity:.55}
.admin-trigger-two{position:fixed;left:7px;bottom:7px;width:24px;height:24px;border:1px solid var(--line-strong);border-radius:50%;background:var(--surface);color:var(--muted);z-index:100;box-shadow:var(--shadow);font-size:10px}.admin-trigger-two:hover{color:var(--primary)}
.app-dialog{border:0;border-radius:22px;padding:0;max-width:min(420px,calc(100vw - 30px));background:transparent;color:var(--text);box-shadow:0 28px 90px rgba(0,0,0,.34)}.app-dialog::backdrop{background:rgba(4,12,24,.52);backdrop-filter:blur(5px)}
.dialog-card{position:relative;padding:30px;background:var(--surface-2);border:1px solid var(--line-strong);border-radius:22px;min-width:min(390px,calc(100vw - 30px))}.student-dialog{min-width:min(540px,calc(100vw - 30px))}.dialog-close{position:absolute;right:12px;top:12px;border:0;background:transparent;color:var(--muted);font-size:15px}.dialog-icon{width:44px;height:44px;display:grid;place-items:center;border-radius:14px;color:var(--primary);background:rgba(0,127,187,.1);font-size:20px}.dialog-card h2{font-family:'Space Grotesk',sans-serif;font-size:23px;margin:16px 0 8px}.dialog-card p{color:var(--muted);font-size:13px;line-height:1.6}.dialog-card label{display:block;font-size:12px;font-weight:700;margin:20px 0 14px}.dialog-card input,.dialog-card select{display:block;width:100%;margin-top:7px;border:1px solid var(--line-strong);border-radius:11px;padding:11px 12px;background:var(--bg-soft);color:var(--text);outline:0}.dialog-card input:focus,.dialog-card select:focus{border-color:var(--primary)}.form-error{color:var(--red)!important;margin:0 0 10px!important}
.student-detail{display:grid;grid-template-columns:100px 1fr;gap:18px;align-items:center}.student-detail .student-avatar{width:100px;height:100px;border-radius:23px;font-size:31px}.student-detail h2{margin:0 0 5px}.student-detail p{margin:0}.student-detail-actions{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:8px;border-top:1px solid var(--line);padding-top:18px}.student-detail-actions label{margin:0}.student-detail-actions input{max-width:235px}
.danger-outline{color:var(--red)!important;border-color:rgba(223,79,103,.32)!important}
.student-score-history-wrap{grid-column:1/-1;border-top:1px solid var(--line);padding-top:16px}.history-heading{display:flex;justify-content:space-between;gap:12px;align-items:baseline;margin-bottom:9px}.history-heading strong{font-size:13px}.history-heading small{font-size:10px;color:var(--muted);text-align:right}.score-history-empty{padding:11px 0;color:var(--muted);font-size:12px}.score-event{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:10px 0;border-top:1px solid var(--line)}.score-event:first-child{border-top:0}.score-event strong{display:inline-block;min-width:40px;font-size:13px}.score-event span{display:block;font-size:12px;color:var(--text);margin-top:3px}.score-event small{display:block;font-size:10px;color:var(--muted);margin-top:3px}.remove-score-event{border:0;background:transparent;color:var(--muted);padding:3px 5px}.remove-score-event:hover{color:var(--red)}

.footer{
  padding:24px 0 36px;
  border-top:1px solid var(--line);
  color:var(--muted);
  font-size:11px;
  margin-top:10px;
}
.footer strong{color:var(--text)}
.footer-muted{opacity:.75}

.custom-toast{
  color:var(--text);
  background:var(--surface-2);
  border:1px solid var(--line-strong);
  box-shadow:var(--shadow);
  backdrop-filter:blur(12px);
}
.custom-toast i{color:var(--green)}

.reveal{
  opacity:0;
  transform:translateY(24px);
  animation:reveal .7s cubic-bezier(.2,.8,.2,1) forwards;
}
.delay-1{animation-delay:.08s}
.delay-2{animation-delay:.16s}
.delay-3{animation-delay:.24s}
@keyframes reveal{to{opacity:1;transform:none}}

@media (max-width:1199.98px){
  .hero-section{padding-top:132px}
  .hero-title{font-size:74px}
  .panel-card{padding:22px}
}

@media (max-width:991.98px){
  .hero-section{padding-top:122px}
  .hero-title{font-size:62px;letter-spacing:-2.5px}
  .hero-subtitle{font-size:14px}
  .class-card{margin-top:4px}
  .chart-wrap{height:280px}
  .donut-layout{grid-template-columns:150px 1fr}
  .seating-layout{grid-template-columns:1fr}.roster-panel{position:static;max-height:none}.student-roster{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:767.98px){
  .navbar{padding:10px 0}
  .brand-logo{width:38px;height:38px;border-radius:12px}
  .brand-logo img{width:28px;height:28px}
  .brand-wrap small{font-size:8px;letter-spacing:1px}
  .hero-section{padding:112px 0 28px}
  .hero-title{font-size:51px;letter-spacing:-2px;margin-top:12px}
  .hero-subtitle{font-size:13px;line-height:1.75}
  .filter-bar{align-items:flex-start}
  .filter-right{width:100%;justify-content:flex-start}
  .updated{width:100%;padding:2px 3px 0}
  .stat-card{min-height:155px}
  .stat-value{font-size:38px}
  .panel-card{padding:18px;border-radius:21px}
  .panel-head{flex-direction:column;align-items:flex-start}
  .trend-badge{align-self:flex-start}
  .search-box{width:100%;min-width:0}
  .chart-wrap{height:240px}
  .donut-layout{grid-template-columns:1fr;gap:17px}
  .donut{width:138px;height:138px}
  .breakdown-list{padding:0 7px}
  .activity-item{grid-template-columns:36px 1fr auto;gap:9px}
  .activity-icon{width:34px;height:34px}
  .activity-top{flex-direction:column;gap:2px}
  .table-custom thead th,.table-custom tbody td{padding-left:9px;padding-right:9px}
  .nav-actions{gap:0!important}.nav-link{font-size:0;padding:9px!important}.nav-link i{font-size:16px;margin:0!important}.page-section{padding-top:105px}.page-heading{align-items:flex-start;flex-direction:column;gap:15px}.groups-grid{grid-template-columns:1fr}.groups-grid>.data-state{min-height:300px}.desks{gap:5px}.seat{min-height:62px;font-size:9px}.classroom-panel{padding:15px}.student-roster{grid-template-columns:1fr}.student-detail{grid-template-columns:72px 1fr}.student-detail .student-avatar{width:72px;height:72px;border-radius:18px;font-size:24px}.dialog-card{min-width:0;width:calc(100vw - 30px);padding:24px 20px}
}

@media (max-width:430px){
  .hero-title{font-size:43px}
  .class-card-name{font-size:24px}
  .stats-section{padding-top:16px}
  .stat-card{padding:18px;min-height:145px}
  .stat-icon{margin-bottom:12px}
  .legend-row{flex-direction:column;gap:4px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*:before,*:after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
  }
}