/* 学生成绩管理系统（Web版）- 全局浅色科技风主题 */
:root{
  --bg:#f6f9ff;
  --surface: rgba(255,255,255,.78);
  --surface2: rgba(255,255,255,.90);
  --text:#0b1220;
  --muted:#55657f;
  --border: rgba(15,23,42,.14);
  --accent:#2563eb;
  --accent2:#7c3aed;
  --good:#16a34a;
  --warn:#f59e0b;
  --bad:#ef4444;
  --shadow: 0 18px 55px rgba(15,23,42,.14);
  --shadow2: 0 10px 30px rgba(15,23,42,.10);
  --radius:16px;
  --gap:14px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font);
  color:var(--text);
  background:
    radial-gradient(1000px 520px at 10% 0%, rgba(37,99,235,.18), transparent 60%),
    radial-gradient(900px 520px at 95% 10%, rgba(124,58,237,.16), transparent 58%),
    radial-gradient(900px 560px at 55% 98%, rgba(16,185,129,.10), transparent 58%),
    linear-gradient(180deg, #ffffff, var(--bg));
}

/* 轻微网格（科技感） */
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(15,23,42,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,23,42,.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(closest-side at 50% 15%, rgba(0,0,0,.95), transparent 78%);
  opacity:.9;
}

a{color:inherit}

.app{
  display:grid;
  grid-template-columns: 280px 1fr;
  min-height:100vh;
  animation: pageFadeIn 0.25s ease-out;
}
.app.nav-collapsed{
  grid-template-columns: 84px 1fr;
}

@keyframes pageFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.sidebar{
  position:sticky;
  top:0;
  height:100vh;
  padding:16px;
  border-right:1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,.82), rgba(255,255,255,.70));
  backdrop-filter: blur(12px);
  z-index: 1100;
}

.sidebar-top{
  display:flex;
  align-items:center;
  gap:10px;
}

.brand{
  flex:1;
  display:flex;
  align-items:center;
  gap:12px;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255,255,255,.95), rgba(255,255,255,.70));
  box-shadow: var(--shadow2);
}
.logo{
  width:40px;height:40px;border-radius:14px;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:hidden;
  flex-shrink:0;
}
.logo svg{
  width:100%;
  height:100%;
  display:block;
}
.brand h1{margin:0;font-size:14px;line-height:1.2}
.brand p{margin:2px 0 0;color:var(--muted);font-size:12px}

.sidebar-toggle{
  width:44px;
  align-self:stretch;
  border:1px solid var(--border);
  border-radius: 14px;
  background: rgba(255,255,255,.70);
  box-shadow: 0 6px 16px rgba(15,23,42,.06);
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  transition: transform .15s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
  flex-shrink:0;
  position:relative;
}
.sidebar-toggle:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,.92);
  border-color: rgba(37,99,235,.22);
  box-shadow: 0 14px 34px rgba(37,99,235,.10);
}
.sidebar-toggle::before{
  content:"";
  position:absolute;
  width:26px;
  height:26px;
  border-radius: 10px;
  background: rgba(37,99,235,.08);
  border:1px solid rgba(37,99,235,.14);
  pointer-events:none;
}
.sidebar-toggle svg{
  width:16px;
  height:16px;
  stroke: rgba(15,23,42,.78);
  position:relative;
  z-index:1;
}

.nav{
  margin-top:14px;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.nav a{
  text-decoration:none;
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius: 14px;
  background: rgba(255,255,255,.70);
  box-shadow: 0 6px 16px rgba(15,23,42,.06);
  transition: transform .15s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
  position: relative;
}
.nav a:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,.92);
  border-color: rgba(37,99,235,.22);
  box-shadow: 0 14px 34px rgba(37,99,235,.10);
}
.nav a.active{
  background: linear-gradient(135deg, rgba(37,99,235,.14), rgba(124,58,237,.12));
  border-color: rgba(37,99,235,.32);
  box-shadow: 0 18px 44px rgba(37,99,235,.14);
}
.nav-ico{
  width:26px;height:26px;
  border-radius: 10px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  background: rgba(37,99,235,.08);
  border:1px solid rgba(37,99,235,.14);
}
.nav a.active .nav-ico{
  background: rgba(37,99,235,.14);
  border-color: rgba(37,99,235,.28);
}
.nav-ico svg{width:16px;height:16px; stroke: rgba(15,23,42,.78)}
.nav .label{font-weight:800;font-size:13px}
.nav .hint{margin-left:auto;color:var(--muted);font-size:12px}

.sidebar.collapsed{padding:16px 10px}
.sidebar.collapsed .brand{justify-content:center; align-items:center; padding:10px; gap:0}
.sidebar.collapsed .brand > div:last-child{display:none}
.sidebar.collapsed .brand h1,
.sidebar.collapsed .brand p{display:none}
.sidebar.collapsed .brand .logo{margin:0 auto}
.sidebar.collapsed .sidebar-top{flex-direction:column; gap:8px}
.sidebar.collapsed .sidebar-toggle{
  width:100%;
  align-self:auto;
  height:44px;
}
.sidebar.collapsed .nav a{justify-content:center; padding:10px}
.sidebar.collapsed .nav .label,
.sidebar.collapsed .nav .hint{display:none !important}
/* 收起状态：侧栏说明/提示一律隐藏，保证“仅图标” */
.sidebar.collapsed .notice{display:none !important}

/* 收起状态：悬浮显示导航名称（tooltip） */
.sidebar.collapsed .nav a::after,
.sidebar.collapsed .sidebar-toggle::after{
  content: attr(data-title);
  position:absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%) translateX(-4px);
  opacity: 0;
  pointer-events:none;
  white-space: nowrap;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid rgba(15,23,42,.14);
  background: rgba(255,255,255,.96);
  box-shadow: 0 18px 50px rgba(15,23,42,.16);
  color: rgba(15,23,42,.88);
  font-weight: 900;
  font-size: 12px;
  z-index: 9999;
}
.sidebar.collapsed .nav a:hover::after,
.sidebar.collapsed .nav a:focus-visible::after,
.sidebar.collapsed .sidebar-toggle:hover::after,
.sidebar.collapsed .sidebar-toggle:focus-visible::after{
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.content{
  padding: 18px 18px 28px;
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.topbar{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px;
  margin-bottom: 20px;
}
.title h2{margin:0;font-size:20px;font-weight:900}
.title p{margin:8px 0 0;color:var(--muted);font-size:13px}
.toolbar{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
  justify-content:flex-end;
}

.btn{
  appearance:none;
  border:1px solid var(--border);
  background: rgba(255,255,255,.82);
  color:var(--text);
  padding:9px 12px;
  border-radius: 14px;
  cursor:pointer;
  font-weight:800;
  font-size:12px;
  box-shadow: 0 6px 16px rgba(15,23,42,.06);
  transition: transform .15s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.btn:hover{transform: translateY(-1px); background: rgba(255,255,255,.95); border-color: rgba(37,99,235,.22); box-shadow: 0 16px 36px rgba(37,99,235,.10)}
.btn.primary{
  background: linear-gradient(135deg, rgba(37,99,235,.18), rgba(124,58,237,.16));
  border-color: rgba(37,99,235,.30);
}
.btn.good{background: rgba(22,163,74,.10); border-color: rgba(22,163,74,.25)}
.btn.warn{background: rgba(245,158,11,.10); border-color: rgba(245,158,11,.25)}
.btn.bad{background: rgba(239,68,68,.10); border-color: rgba(239,68,68,.25)}
.btn:disabled{opacity:.55; cursor:not-allowed; transform:none}

.input, select, textarea{
  border:1px solid var(--border);
  background: rgba(255,255,255,.85);
  color:var(--text);
  border-radius: 14px;
  padding:9px 12px;
  outline:none;
  box-shadow: 0 6px 16px rgba(15,23,42,.06);
}
select{padding:9px 10px}
textarea{min-height:120px; resize:vertical; width:100%}
.input:focus, select:focus, textarea:focus{border-color: rgba(37,99,235,.40)}

/* 班级筛选现代样式 */
.filter-group{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:8px 14px;
  border-radius:16px;
  border:1px solid rgba(37,99,235,.20);
  background: linear-gradient(135deg, rgba(255,255,255,.95), rgba(248,250,252,.92));
  box-shadow: 
    0 4px 12px rgba(15,23,42,.08),
    0 1px 3px rgba(15,23,42,.04),
    inset 0 1px 0 rgba(255,255,255,.8);
  transition: all .2s ease;
  position:relative;
  overflow:hidden;
}
.filter-group::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:2px;
  background: linear-gradient(90deg, rgba(37,99,235,.6), rgba(124,58,237,.5));
  opacity:0;
  transition: opacity .2s ease;
}
.filter-group:hover{
  border-color: rgba(37,99,235,.35);
  box-shadow: 
    0 8px 20px rgba(37,99,235,.12),
    0 2px 6px rgba(15,23,42,.06),
    inset 0 1px 0 rgba(255,255,255,.9);
  transform: translateY(-1px);
}
.filter-group:hover::before{
  opacity:1;
}
.filter-label{
  font-size:12px;
  font-weight:700;
  color: rgba(37,99,235,.85);
  white-space:nowrap;
  letter-spacing:0.3px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
}
.filter-label::before{
  content:"";
  width:4px;
  height:4px;
  border-radius:50%;
  background: linear-gradient(135deg, rgba(37,99,235,.8), rgba(124,58,237,.7));
  box-shadow: 0 0 6px rgba(37,99,235,.4);
}
#dashClassFilter, #classFilter, #importStrategy{
  appearance:none;
  border:none;
  background: transparent;
  padding:4px 26px 4px 8px;
  font-size:13px;
  font-weight:700;
  color:var(--text);
  outline:none;
  position:relative;
  cursor:pointer;
  min-width:100px;
}
#dashClassFilter:focus, #classFilter:focus, #importStrategy:focus{
  outline:none;
}
#dashClassFilter option, #classFilter option, #importStrategy option{
  font-weight:600;
  padding:8px;
}
.filter-select-wrap{
  position:relative;
  display:inline-flex;
  align-items:center;
}
.filter-select-wrap::after{
  content:"";
  position:absolute;
  right:8px;
  width:0;
  height:0;
  border-left:5px solid transparent;
  border-right:5px solid transparent;
  border-top:6px solid rgba(37,99,235,.65);
  pointer-events:none;
  transition: all .2s ease;
}
.filter-select-wrap:hover::after{
  border-top-color: rgba(37,99,235,.9);
  transform: translateY(1px);
}
.filter-input{
  appearance:none;
  border:none;
  background: transparent;
  padding:4px 8px;
  font-size:13px;
  font-weight:700;
  color:var(--text);
  outline:none;
  min-width:80px;
  max-width:120px;
}
.filter-input:focus{
  outline:none;
}
.filter-input::-webkit-inner-spin-button,
.filter-input::-webkit-outer-spin-button{
  opacity:1;
}

.grid{display:grid; grid-template-columns: repeat(12, 1fr); gap: var(--gap)}
.card{
  grid-column: span 12;
  border:1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.card-chart{
  grid-column: span 4;
}
.card-subject{
  grid-column: span 7;
}
.card-class{
  grid-column: span 5;
}
.card-chart{
  grid-column: span 4;
}
.card-subject{
  grid-column: span 7;
}
.card-class{
  grid-column: span 5;
}
.card .hd{
  padding: 12px 14px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  border-bottom:1px solid var(--border);
  background: rgba(255,255,255,.65);
}
.card .hd h3{margin:0;font-size:13px}
.card .hd .sub{color:var(--muted);font-size:12px}
.card .bd{padding: 14px}

.kpi{display:grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: var(--gap)}
.kpi.kpi-3-4{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.kpi.kpi-3-4 .kpi-row{
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: var(--gap);
  width: 100%;
  flex-wrap: wrap;
}
.kpi.kpi-3-4 .kpi-row:first-child{
  max-width: 100%;
}
.kpi.kpi-3-4 .kpi-row:last-child{
  max-width: 100%;
}
.kpi .item{
  border:1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  box-shadow: 0 8px 24px rgba(15,23,42,.10);
  transition: transform .2s ease, box-shadow .2s ease;
  position:relative;
  overflow:hidden;
  flex: 1;
  min-width: 200px;
  max-width: 300px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
}
.kpi .item::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:3px;
  background: linear-gradient(90deg, rgba(37,99,235,.8), rgba(124,58,237,.8));
  opacity:0;
  transition: opacity .2s ease;
}
.kpi .item:hover{
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(15,23,42,.14);
}
.kpi .item:hover::before{
  opacity:1;
}
.kpi .item .kpi-icon{
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(15,23,42,.75);
  flex-shrink: 0;
}
.kpi .item .kpi-icon svg{
  width: 100%;
  height: 100%;
}
.kpi .item .kpi-content{
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.kpi .item .t{
  color:var(--muted);
  font-size:12px;
  font-weight:700;
  text-transform: uppercase;
  letter-spacing:0.5px;
  margin-bottom:6px;
}
.kpi .item .v{
  font-weight:900;
  font-size:24px;
  color: rgba(15,23,42,.9);
  line-height:1.2;
}
.kpi .item .m{
  margin-top:6px;
  color:var(--muted);
  font-size:11px;
  font-weight:600;
}

.tabs{display:flex; gap:8px; flex-wrap:wrap}
.tab{
  padding:8px 10px;
  border:1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,.82);
  cursor:pointer;
  font-weight:900;
  font-size:12px;
  box-shadow: 0 8px 20px rgba(15,23,42,.08);
}
.tab.active{
  background: linear-gradient(135deg, rgba(37,99,235,.16), rgba(124,58,237,.14));
  border-color: rgba(37,99,235,.30);
}

.table{width:100%; border-collapse: collapse}
.table th,.table td{
  padding: 12px 12px;
  border-bottom: 1px solid var(--border);
  text-align:left;
  font-size:13px;
}
.table th{
  color: var(--muted);
  font-weight:900;
  background: rgba(255,255,255,.75);
  font-size:12px;
  text-transform: uppercase;
  letter-spacing:0.5px;
}
.table tr:hover td{background: rgba(37,99,235,.04)}

.muted{color:var(--muted)}
.row{display:flex; gap:10px; align-items:center; flex-wrap:wrap}
.spacer{flex:1}
.pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding: 4px 9px;
  border-radius: 999px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.82);
  font-size:12px;
  color: var(--muted);
  box-shadow: 0 8px 20px rgba(15,23,42,.06);
}
.pill.good{color: rgba(22,163,74,.95); border-color: rgba(22,163,74,.22); background: rgba(22,163,74,.10)}
.pill.warn{color: rgba(245,158,11,.95); border-color: rgba(245,158,11,.24); background: rgba(245,158,11,.10)}
.pill.bad{color: rgba(239,68,68,.95); border-color: rgba(239,68,68,.24); background: rgba(239,68,68,.10)}
.pill.info{color: rgba(37,99,235,.95); border-color: rgba(37,99,235,.24); background: rgba(37,99,235,.10)}

.modal{
  position:fixed;
  inset:0;
  background: rgba(15,23,42,.45);
  display:none;
  align-items:stretch;
  justify-content:flex-end;
  z-index:1000;
}
.modal.show{display:flex}
.drawer{
  width:min(560px, 92vw);
  height:100%;
  background: rgba(255,255,255,.92);
  border-left:1px solid var(--border);
  box-shadow: -12px 0 40px rgba(15,23,42,.20);
  display:flex;
  flex-direction:column;
}
.drawer .hd{padding: 14px; border-bottom:1px solid var(--border); display:flex; gap:10px; align-items:center}
.drawer .hd h3{margin:0;font-size:14px}
.drawer .bd{padding: 14px; overflow:auto}
.drawer .ft{padding: 14px; border-top:1px solid var(--border); display:flex; gap:10px; justify-content:flex-end}

.notice{
  border:1px dashed rgba(15,23,42,.22);
  background: rgba(255,255,255,.78);
  border-radius: 16px;
  padding: 12px;
  color: var(--muted);
  font-size:12px;
  box-shadow: 0 10px 26px rgba(15,23,42,.08);
}
.notice strong{color: var(--text)}

@media (max-width: 980px){
  .app{grid-template-columns: 1fr}
  .sidebar{position:relative; height:auto}
  .kpi{grid-template-columns: repeat(2, minmax(0,1fr))}
  .card-chart,
  .card-subject,
  .card-class{
    grid-column: span 12;
  }
}