* { box-sizing: border-box; }
body { margin: 0; font-family: "Microsoft YaHei", sans-serif; background: #f1f5f9; color: #0f172a; }
.topbar { background: #0f766e; color: #fff; padding: 0.75rem 1.5rem; }
.topbar-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
.nav a { color: #ecfdf5; margin-left: 1rem; text-decoration: none; }
.container { max-width: 1200px; margin: 1.5rem auto; padding: 0 1rem; }
.card { background: #fff; border-radius: 10px; padding: 1.25rem; margin-bottom: 1rem; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.section-head h1 { margin: 0 0 .25rem; }
.section-head p { color: #64748b; margin: 0 0 1rem; }
.btn { display: inline-block; padding: .45rem .9rem; border-radius: 6px; border: 1px solid #cbd5e1; background: #fff; cursor: pointer; text-decoration: none; color: #0f172a; font: inherit; }
.btn:disabled { opacity: 0.65; cursor: not-allowed; }
.btn-primary { background: #0d9488; color: #fff; border-color: #0d9488; }
.btn-secondary { background: #e2e8f0; }
.btn-warning { background: #f59e0b; color: #fff; border-color: #f59e0b; }
.btn-danger { background: #dc2626; color: #fff; border-color: #dc2626; }
.btn-danger:hover { background: #b91c1c; border-color: #b91c1c; }
.btn-danger:disabled { opacity: 0.65; cursor: not-allowed; }
.btn-sm { padding: .25rem .5rem; font-size: .85rem; }
.login-wrap { min-height: 70vh; display: flex; align-items: center; justify-content: center; }
.login-card { width: 380px; }
.login-card label { display: block; margin-bottom: .75rem; }
.login-card input { width: 100%; padding: .5rem; margin-top: .25rem; }
.class-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(220px,1fr)); gap: 1rem; }
.class-card { background: #fff; padding: 1.25rem; border-radius: 10px; text-decoration: none; color: inherit; border: 1px solid #e2e8f0; }
.class-card:hover { border-color: #0d9488; }
.toolbar { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1rem; }
.student-panel { margin-bottom: 1rem; }
.student-head { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-bottom: .75rem; }
.score-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(180px,1fr)); gap: .5rem; }
.score-field span { display: block; font-size: .85rem; color: #64748b; }
.score-field input { width: 100%; padding: .35rem; }
.score-field.is-abnormal input { border: 2px solid #dc2626; background: #fef2f2; }
.data-table { width: 100%; border-collapse: collapse; background: #fff; }
.data-table th, .data-table td { border: 1px solid #e2e8f0; padding: .5rem .75rem; text-align: left; }
.msg.ok, .toast.ok { color: #059669; }
.msg.err, .toast.err { color: #dc2626; }
.toast { position: fixed; top: 1rem; right: 1rem; background: #fff; padding: .75rem 1rem; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,.15); display: none; }
.toast.show { display: block; }
.stat-row { display: flex; gap: 1rem; margin-bottom: 1rem; }
.stat { background: #fff; padding: .75rem 1rem; border-radius: 8px; }
.stat.ok { color: #059669; } .stat.err { color: #dc2626; }
.empty { padding: 2rem; color: #64748b; }
.hint { font-size: .85rem; color: #64748b; }
.upload-btn { cursor: pointer; }
.filter-form { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1rem; }