/* Global reset */
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;background:var(--bg);color:var(--text);font-size:var(--fs-base);-webkit-font-smoothing:antialiased}

/* Unified top navigation bar */
.topnav{height:52px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 24px;position:fixed;top:0;left:0;right:0;z-index:100;box-shadow:var(--shadow-sm);gap:0}
.topnav-brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:15px;letter-spacing:.5px;color:var(--primary);margin-right:32px;flex-shrink:0}.topnav-logo{height:32px;object-fit:contain;flex-shrink:0}
.topnav-tabs{display:flex;gap:0;height:100%}
.topnav-tab{height:52px;display:flex;align-items:center;gap:6px;padding:0 20px;font-size:var(--fs-base);font-weight:500;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;transition:all var(--transition-fast);white-space:nowrap}
.topnav-tab .nav-icon{display:inline-block;flex-shrink:0}
.topnav-tab:hover{color:var(--text);background:var(--neutral-bg)}
.topnav-tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}
.topnav-tab.admin-tab{margin-left:auto}
.topnav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.topnav-user{font-size:var(--fs-sm);color:var(--muted)}
.topnav-logout{font-size:var(--fs-sm);color:var(--muted);cursor:pointer;text-decoration:none;padding:4px 10px;border-radius:var(--radius-sm);transition:all var(--transition-fast)}
.topnav-logout:hover{color:var(--primary);background:var(--primary-bg)}
.share-icon{vertical-align:middle;margin-right:4px}
.share-label{vertical-align:middle}

/* Avatar dropdown menu */
.user-dropdown-wrap{position:relative;display:flex;align-items:center}
.user-avatar-btn{width:32px;height:32px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;background:var(--primary);color:#fff;font-weight:600;font-size:14px;border:2px solid transparent;transition:border-color var(--transition-fast);user-select:none;flex-shrink:0}
.user-avatar-btn:hover{border-color:var(--primary-light)}
.user-avatar-btn img{width:32px;height:32px;border-radius:50%;object-fit:cover}
.user-dropdown{position:absolute;top:44px;right:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);min-width:180px;z-index:200;padding:4px 0;opacity:0;visibility:hidden;transition:opacity var(--transition-fast),visibility var(--transition-fast)}
.user-dropdown.show{opacity:1;visibility:visible}
.dropdown-item{padding:8px 16px;cursor:pointer;font-size:var(--fs-sm);color:var(--text);display:flex;align-items:center;gap:8px;transition:background var(--transition-fast)}
.dropdown-item:hover{background:var(--neutral-bg)}
.dropdown-item.danger{color:var(--danger)}
.dropdown-item.danger:hover{background:var(--danger-bg)}
.dropdown-item.hidden{display:none}
.dropdown-divider{height:1px;background:var(--line);margin:4px 0}
.dropdown-header{padding:10px 16px 6px;font-weight:600;font-size:var(--fs-md);line-height:1.4}
.dropdown-role{display:block;font-weight:400;font-size:var(--fs-xs);color:var(--muted);margin-top:1px}

/* Rich text editor toolbar */
.rt-toolbar{display:flex;gap:2px;padding:6px 8px;border:1px solid var(--line);border-bottom:0;border-radius:var(--radius-md) var(--radius-md) 0 0;background:var(--neutral-bg);flex-wrap:wrap}
.rt-toolbar button{display:flex;align-items:center;justify-content:center;width:30px;height:28px;border:1px solid transparent;border-radius:var(--radius-sm);background:transparent;cursor:pointer;font-size:14px;color:var(--text2);transition:all var(--transition-fast)}
.rt-toolbar button:hover{background:var(--primary-bg);border-color:var(--primary-border);color:var(--primary)}
.rt-toolbar .sep{width:1px;background:var(--line);margin:2px 4px}
.richtext-editor{min-height:120px;border:1px solid var(--line);border-radius:0 0 var(--radius-md) var(--radius-md);padding:10px;font-size:var(--fs-base);line-height:1.6;outline:none;background:#fff}
.richtext-editor:focus{border-color:var(--primary-border)}

/* Main body offset for fixed navbar */
.app-body{margin-top:52px;height:calc(100vh - 52px);overflow:hidden}

/* View system */
.view{display:none;height:100%}.view.active{display:flex;flex-direction:column}

/* Utility classes (P1: extracted from repeated inline styles) */
.flex-between{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.flex-between-start{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.flex-center-wrap{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.flex-end{display:flex;gap:8px;justify-content:flex-end}
.gap-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.mt4{margin-top:4px}.mt8{margin-top:8px}.mt10{margin-top:10px}.mt12{margin-top:12px}.mt14{margin-top:14px}.mt16{margin-top:16px}
.mb10{margin-bottom:10px}.mb12{margin-bottom:12px}.mb16{margin-bottom:16px}
.m0{margin:0}.ml44{margin-left:44px}.py4{padding:4px 0}
.member-flow{display:flex;flex-wrap:wrap;gap:6px}
.td-sm{padding:4px 6px}.td-md{padding:6px 8px}
.td-bold{padding:6px 8px;font-weight:600}.td-bold-w{padding:6px 8px;font-weight:600;width:120px}
.text2{color:var(--text2)}.fw-600{font-weight:600}
.radio-label{margin:0;display:flex;align-items:center;gap:3px}
.flex-add-row{display:flex;gap:8px;align-items:center}
.row-center{display:flex;align-items:center;gap:8px}
.opacity-muted{opacity:0.6}
.ml6{margin-left:6px}.ml28{margin-left:28px}
.mv8{margin:8px 0}.mb8{margin-bottom:8px}
.p-4-12{padding:4px 12px}
.w-full{width:100%}
.table-base{width:100%;border-collapse:collapse}
.border-th{border-bottom:2px solid var(--line);text-align:left}
.bg-blue-light{border-bottom:1px solid var(--line);background:var(--primary-bg)}
.wh-pre{white-space:pre-wrap}
.flex-1{flex:1}
.hidden{display:none}
.login-page.hidden{display:none}
body.modal-open{overflow:hidden}
.scroll-box{max-height:85vh;overflow:auto;overscroll-behavior:contain;padding:18px}
.scroll-box-np{max-height:85vh;overflow:auto;overscroll-behavior:contain}
.mt0{margin-top:0}.mb0{margin-bottom:0}.mb14{margin-bottom:14px}
.hint-sm{color:var(--muted);font-weight:400;margin-left:4px}
.hint-sm-noml{color:var(--muted);font-weight:400}
.sidebar-entry{padding:8px 12px;border-top:1px solid var(--line)}
.sidebar-entry a{font-size:var(--fs-sm);color:var(--muted)}
.w34-center{width:34px;text-align:center}
.form-grid-one{grid-template-columns:1fr}
.bind-parent-list{max-height:50vh}
.opacity-disabled{opacity:.4;pointer-events:none}

/* Animations & design polish */
.main{scroll-behavior:smooth}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes slideUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@keyframes shake{0%,100%{transform:translateX(0)}20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}
.field-shake{animation:shake .35s ease}
.field-error{border-color:var(--danger)!important;box-shadow:0 0 0 3px rgba(208,67,32,.18)!important}
.card{animation:fadeIn .25s ease}
.student{animation:slideUp .2s ease}
.detail-top-area .card{animation:none}

/* Focus visible for keyboard navigation */
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}

/* Subtle scrollbar */
aside::-webkit-scrollbar,.main::-webkit-scrollbar{width:6px}
aside::-webkit-scrollbar-thumb,.main::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:3px}
aside::-webkit-scrollbar-thumb:hover,.main::-webkit-scrollbar-thumb:hover{background:#9ca3af}

/* ICP footer */
.icp-footer{position:fixed;bottom:0;left:0;right:0;z-index:999;text-align:center;padding:4px 0;pointer-events:none}
.icp-footer a{pointer-events:auto;color:var(--muted);font-size:10px;text-decoration:none;opacity:.55;transition:opacity .2s}
.icp-footer a:hover{opacity:1;color:var(--link)}