:root{--pri:#2a6f97;--pri-d:#1a4f6f;--pri-l:#6baed6;--acc:#c77d3a;--bg:#f5f7fa;--bg-w:#fff;--bg-c:#edf1f6;--tx:#15202b;--tx-m:#5a6d7e;--tx-l:#94a3b4;--bd:#dae2ea;--tag-b:#d6e6f3;--tag-t:#1a4f6f;--hl:#bdd8ed;--sh:0 2px 16px rgba(42,111,151,.08);--sh-h:0 8px 32px rgba(42,111,151,.16);--success:#16a34a;--warn:#f59e0b;--danger:#dc2626;--info:#3b82f6}
*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}
body{font-family:'Inter','PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--tx);line-height:1.7;-webkit-font-smoothing:antialiased}
nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--bd);padding:0 2rem;display:flex;align-items:center;justify-content:space-between;height:56px;box-shadow:0 1px 12px rgba(42,111,151,.06)}
.nav-logo{font-size:1.05rem;font-weight:700;color:var(--pri-d);display:flex;align-items:center;gap:8px;text-decoration:none;letter-spacing:-.2px}
.nav-links{display:flex;gap:.5rem;list-style:none;align-items:center}
.nav-links a{text-decoration:none;color:var(--tx-m);font-size:.8rem;padding:4px 8px;border-radius:6px;transition:all .2s;white-space:nowrap}
.nav-links a:hover,.nav-links a.active{color:var(--pri-d);background:var(--tag-b)}
.nav-btn{background:var(--pri);color:#fff;border:none;padding:5px 12px;border-radius:8px;font-size:.8rem;cursor:pointer;font-weight:600;transition:all .2s}
.nav-btn:hover{background:var(--pri-d)}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;font-size:1.3rem;color:var(--pri-d)}

/* Hero */
.hero{background:linear-gradient(135deg,#1a4f6f 0%,#2a6f97 40%,#6baed6 100%);padding:3.5rem 2rem 2.5rem;text-align:center;position:relative;overflow:hidden}.hero-content{position:relative;z-index:1}
.hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 70% 50%,rgba(255,255,255,.18) 0%,transparent 60%);pointer-events:none}
.hero-badge{display:inline-block;background:rgba(255,255,255,.25);border:1px solid rgba(255,255,255,.4);color:#fff;font-size:.75rem;padding:3px 14px;border-radius:18px;margin-bottom:.8rem;letter-spacing:1px;font-weight:500}
.hero h1{font-size:clamp(1.5rem,4vw,2.6rem);font-weight:800;color:#fff;margin-bottom:.6rem;text-shadow:0 2px 12px rgba(26,79,111,.3);letter-spacing:-.5px}
.hero p{font-size:.95rem;color:rgba(255,255,255,.88);max-width:560px;margin:0 auto 1.2rem}
.hero-stats{display:flex;justify-content:center;gap:1.2rem;flex-wrap:wrap;margin-top:1.2rem}
.hero-stat{background:rgba(255,255,255,.18);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.25);border-radius:12px;padding:.7rem 1rem;text-align:center;min-width:90px}
.hero-stat .num{font-size:1.5rem;font-weight:800;color:#fff}.hero-stat .label{font-size:.72rem;color:rgba(255,255,255,.8);margin-top:2px}

/* Container & Section */
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
.section{padding:2.2rem 0}
.section-title{font-size:1.3rem;font-weight:700;color:var(--pri-d);margin-bottom:.3rem;display:flex;align-items:center;gap:10px}
.section-sub{color:var(--tx-m);font-size:.85rem;margin-bottom:1.3rem}
.anchor-target{scroll-margin-top:66px}
.wrap{background:var(--bg-w);border-radius:14px;border:1px solid var(--bd);overflow:hidden;box-shadow:var(--sh)}
.wrap-hdr{padding:.7rem 1.1rem;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--bd)}
.wrap-hdr.pri{background:linear-gradient(90deg,var(--pri),var(--pri-l));color:#fff}
.wrap-hdr.pri h3{font-size:.9rem;font-weight:600}
.wrap-body{padding:1rem}

/* Section Headers */
.section-hdr{text-align:center;margin-bottom:1.5rem}
.section-tag{display:inline-block;background:var(--tag-b);color:var(--tag-t);padding:3px 14px;border-radius:16px;font-size:.75rem;font-weight:600;margin-bottom:.5rem;letter-spacing:.5px}
.section-hdr h2{font-size:1.4rem;font-weight:800;color:var(--pri-d);letter-spacing:-.3px}
.section-hdr p{color:var(--tx-m);font-size:.85rem;margin-top:.3rem}
.section-alt{background:var(--bg-c)}

/* Hero Enhancements */
.hero-bg{position:absolute;inset:0;pointer-events:none;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E")}
.hero-desc{font-size:.95rem;color:rgba(255,255,255,.88);max-width:560px;margin:0 auto 1.2rem}
.stat-item{background:rgba(255,255,255,.18);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.25);border-radius:12px;padding:.7rem 1rem;text-align:center;min-width:90px}
.stat-num{display:block;font-size:1.5rem;font-weight:800;color:#fff}
.stat-lbl{display:block;font-size:.72rem;color:rgba(255,255,255,.8);margin-top:2px}
.hero-actions{display:flex;gap:.8rem;justify-content:center;margin-top:1.2rem;flex-wrap:wrap}
.btn-primary{display:inline-block;background:#fff;color:var(--pri-d);padding:10px 28px;border-radius:10px;font-weight:700;font-size:.9rem;text-decoration:none;transition:all .25s;box-shadow:0 4px 16px rgba(0,0,0,.1)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(0,0,0,.15)}
.btn-outline{display:inline-block;background:transparent;color:#fff;padding:10px 28px;border-radius:10px;font-weight:700;font-size:.9rem;text-decoration:none;border:2px solid rgba(255,255,255,.5);transition:all .25s}
.btn-outline:hover{background:rgba(255,255,255,.15);border-color:#fff}

/* Mindmap */
.mindmap-container{background:var(--bg-w);border-radius:14px;border:1px solid var(--bd);box-shadow:var(--sh);padding:1.5rem;overflow-x:auto}
.mindmap-tree{max-width:800px;margin:0 auto}
.mm-root{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--pri-d),var(--pri));color:#fff;padding:10px 20px;border-radius:16px;font-weight:800;font-size:1rem;margin-bottom:1rem;box-shadow:0 3px 12px rgba(42,111,151,.3);letter-spacing:-.2px}
.mm-branch{margin-left:.3rem;padding-left:1.2rem;border-left:2px solid var(--bd);margin-bottom:.4rem}
.mm-node{margin:2px 0}
.mm-node-hdr{display:inline-flex;align-items:center;gap:5px;padding:2px 4px;border-radius:6px;cursor:pointer;transition:background .15s}
.mm-node-hdr:hover{background:var(--bg-c)}
.mm-toggle{font-size:.65rem;color:var(--tx-l);width:14px;text-align:center;flex-shrink:0;transition:transform .15s;user-select:none}
.mm-node-title{font-weight:600;color:var(--tx)}
.mm-branch-hdr{display:inline-flex;align-items:center;gap:6px;background:var(--pri-d);color:#fff;padding:5px 14px;border-radius:8px;font-weight:700;font-size:.85rem;cursor:pointer;margin-bottom:5px;transition:background .2s;user-select:none}
.mm-branch-hdr:hover{background:var(--pri)}
.mm-branch-hdr .mm-toggle{color:rgba(255,255,255,.7)}
.mm-branch-hdr .mm-toggle:hover{color:#fff}
.mm-children{padding-left:1rem;border-left:2px solid var(--bg-c);margin-left:8px}
.mm-leaf{font-size:.8rem;color:var(--tx-m);padding:2px 0 2px 8px;line-height:1.5}
.mm-leaf::before{content:'•';color:var(--pri);margin-right:5px;font-weight:700}
.mm-node.mm-open>.mm-node-hdr .mm-node-title{color:var(--pri-d)}
.mm-synced>.mm-node-hdr .mm-node-title{color:#16a34a;font-style:italic;font-weight:700}
.mm-synced>.mm-node-hdr{background:rgba(22,163,74,.08);border-radius:6px}
.mm-synced{border-left:3px solid #16a34a!important;padding-left:6px;background:linear-gradient(90deg,rgba(22,163,74,.05),rgba(22,163,74,.02));border-radius:0 8px 8px 0;box-shadow:0 0 12px rgba(22,163,74,.08)}
.mm-sync-badge{display:inline-block;background:linear-gradient(135deg,#16a34a,#22c55e);color:#fff;font-size:.5rem;font-weight:800;padding:1px 5px;border-radius:3px;margin-left:6px;letter-spacing:.5px;vertical-align:middle;line-height:1.4;text-shadow:0 1px 1px rgba(0,0,0,.15)}
.mm-synced .mm-leaf::before{color:#16a34a}
.mindmap-actions{text-align:center;margin-top:1rem;display:flex;justify-content:center;gap:.5rem;flex-wrap:wrap}
.mindmap-actions .btn-outline{display:inline-block;padding:8px 20px;border-radius:8px;font-weight:600;font-size:.82rem;cursor:pointer;text-decoration:none;transition:all .2s;background:transparent;color:var(--pri-d);border-color:var(--pri-l)}
.mindmap-actions .btn-outline:hover{background:var(--tag-b)}

/* Modules */
.modules-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1rem}
.mod-card{background:var(--bg-w);border-radius:14px;border:1px solid var(--bd);overflow:hidden;box-shadow:var(--sh);transition:all .3s}
.mod-card:hover{box-shadow:var(--sh-h);transform:translateY(-2px)}
.card-hdr{padding:.9rem 1rem;display:flex;align-items:center;gap:9px;border-bottom:1px solid var(--bd)}
.card-ic{width:38px;height:38px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}
.card-t{font-size:.9rem;font-weight:700;color:var(--tx);letter-spacing:-.2px}.card-st{font-size:.75rem;color:var(--tx-m);margin-top:1px}
.card-bd{padding:.9rem 1rem}
.card-tags{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:.7rem}
.tag{background:var(--tag-b);color:var(--tag-t);padding:2px 8px;border-radius:14px;font-size:.72rem;font-weight:500}
.card-list{list-style:none}.card-list li{padding:5px 0;border-bottom:1px solid var(--bg-c);font-size:.82rem;color:var(--tx);display:flex;align-items:flex-start;gap:6px}
.card-list li:last-child{border-bottom:none}.card-list li::before{content:'▸';color:var(--pri);flex-shrink:0;margin-top:1px}
.card-ft{background:var(--bg-c);padding:.5rem 1rem;display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--bd)}
.pbar{flex:1;height:5px;background:var(--bd);border-radius:3px;overflow:hidden;margin:0 7px}
.pfill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--pri),var(--pri-l));transition:width .8s}
.plbl{font-size:.72rem;color:var(--tx-m)}

/* Metrics Table */
.table-wrap{overflow-x:auto;border-radius:12px;border:1px solid var(--bd);box-shadow:var(--sh)}
#metricsTable{width:100%;border-collapse:collapse;font-size:.82rem}
#metricsTable th{background:linear-gradient(90deg,var(--pri),var(--pri-d));color:#fff;padding:10px 14px;text-align:left;font-weight:600;white-space:nowrap}
#metricsTable td{padding:9px 14px;border-bottom:1px solid var(--bg-c);vertical-align:top}
#metricsTable tr:last-child td{border-bottom:none}
#metricsTable tr:nth-child(even) td{background:rgba(237,241,246,.5)}
#metricsTable tr:hover td{background:var(--hl)}
#metricsTable tbody tr{cursor:pointer;transition:background .15s}
.mt{width:100%;border-collapse:collapse;font-size:.82rem}
.mt th{background:linear-gradient(90deg,var(--pri),var(--pri-d));color:#fff;padding:9px 12px;text-align:left;font-weight:600;white-space:nowrap}
.mt td{padding:8px 12px;border-bottom:1px solid var(--bg-c);vertical-align:top}
.mt tr:last-child td{border-bottom:none}.mt tr:nth-child(even) td{background:var(--bg-c)}.mt tr:hover td{background:var(--hl)}
.mn{font-weight:700;color:var(--pri-d)}
.fm{font-family:'JetBrains Mono','Courier New',monospace;background:var(--tag-b);padding:2px 6px;border-radius:4px;font-size:.78em;color:var(--pri-d)}
.bm{color:var(--tx-m);font-size:.78em}
.lh{background:#dcfce7;color:#166534;padding:1px 6px;border-radius:8px;font-size:.74em;font-weight:600}
.lm{background:var(--tag-b);color:var(--tag-t);padding:1px 6px;border-radius:8px;font-size:.74em;font-weight:600}

/* Glossary */
.glossary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:.7rem}
.gi{background:var(--bg-w);border-radius:8px;padding:.8rem .9rem;border:1px solid var(--bd);box-shadow:var(--sh);transition:all .2s;cursor:pointer}
.gi:hover{border-color:var(--pri-l);box-shadow:var(--sh-h);transform:translateY(-1px)}
.gt{font-weight:700;color:var(--pri-d);font-size:.88rem;margin-bottom:2px;display:flex;align-items:center;gap:6px}
.ge{font-size:.75rem;color:var(--tx-l);font-style:italic}
.gd{font-size:.78rem;color:var(--tx-m);line-height:1.5}
.gb{display:inline-block;background:var(--hl);color:var(--pri-d);padding:1px 5px;border-radius:7px;font-size:.68rem;font-weight:600}

/* Footer */
footer{background:linear-gradient(135deg,var(--pri-d),#14364d);color:rgba(255,255,255,.85);padding:1.8rem 2rem;text-align:center;margin-top:2.5rem}
footer h3{color:#fff;font-size:.92rem;margin-bottom:.2rem}
footer p{font-size:.78rem;margin-bottom:.2rem}footer a{color:var(--pri-l);text-decoration:none}footer a:hover{color:#fff}
.footer-content{display:flex;justify-content:space-between;gap:2rem;margin-bottom:1.5rem}
.footer-about h3{font-size:1rem;font-weight:700;margin-bottom:.4rem}
.footer-about p{font-size:.82rem;opacity:.8;line-height:1.5}
.footer-links{display:flex;flex-direction:column;gap:5px}
.footer-links h4{font-size:.88rem;font-weight:700;margin-bottom:.3rem}
.footer-links a{color:rgba(255,255,255,.7);text-decoration:none;font-size:.82rem;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:1rem}
.footer-bottom p{font-size:.75rem;opacity:.5}

/* Back to Top */
.btt{position:fixed;bottom:1.5rem;right:1.5rem;background:var(--pri);color:#fff;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1rem;cursor:pointer;z-index:200;box-shadow:0 4px 16px rgba(42,111,151,.35);transition:all .3s;opacity:.85;text-decoration:none}
.btt:hover{background:var(--pri-d);transform:translateY(-2px);opacity:1}

/* ===== Admin Panel (ENLARGED) ===== */
#adminOverlay{position:fixed;inset:0;background:rgba(21,32,43,.5);z-index:500;display:none;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
#adminOverlay.open{display:flex}
.admin-panel{background:var(--bg-w);border-radius:16px;width:96%;max-width:1100px;max-height:92vh;overflow:hidden;box-shadow:0 16px 64px rgba(21,32,43,.3);display:flex;flex-direction:column}
.admin-hdr{background:linear-gradient(90deg,var(--pri-d),var(--pri));color:#fff;padding:.9rem 1.3rem;display:flex;align-items:center;justify-content:space-between;flex-shrink:0}
.admin-hdr h2{font-size:1rem;font-weight:700;letter-spacing:-.2px}
.admin-hdr span{font-size:.78rem;opacity:.85;margin-right:10px}
.admin-close{background:rgba(255,255,255,.2);border:none;color:#fff;width:30px;height:30px;border-radius:7px;cursor:pointer;font-size:1rem}
.admin-close:hover{background:rgba(255,255,255,.35)}
.admin-tabs{display:flex;border-bottom:2px solid var(--bd);flex-shrink:0;background:var(--bg-c);overflow-x:auto;gap:2px;padding:0 .5rem}
.admin-tab{padding:.6rem .9rem;cursor:pointer;font-size:.8rem;font-weight:600;color:var(--tx-m);border:none;background:none;transition:all .2s;border-bottom:2px solid transparent;margin-bottom:-2px;white-space:nowrap}
.admin-tab:hover{color:var(--pri-d)}.admin-tab.active{color:var(--pri-d);border-bottom-color:var(--pri);background:var(--bg-w)}
.admin-body{flex:1;overflow-y:auto;padding:1.2rem}
.admin-tab-content{display:none}.admin-tab-content.active{display:block}
.admin-card{background:var(--bg-c);border:1px solid var(--bd);border-radius:9px;padding:.9rem;margin-bottom:.7rem}
.admin-card h4{font-size:.85rem;font-weight:700;color:var(--tx);margin-bottom:5px;display:flex;align-items:center;justify-content:space-between}
.admin-card h4 .badge{font-size:.7rem;background:var(--tag-b);color:var(--tag-t);padding:1px 7px;border-radius:8px;font-weight:500}
.admin-card p{font-size:.78rem;color:var(--tx-m);line-height:1.4}
.admin-card .card-actions{display:flex;gap:5px;margin-top:6px}
.abtn{padding:4px 10px;border-radius:6px;font-size:.75rem;cursor:pointer;border:1px solid var(--bd);background:var(--bg-w);color:var(--tx-m);transition:all .2s;font-weight:500}
.abtn:hover{border-color:var(--pri);color:var(--pri)}
.abtn.pri{background:var(--pri);color:#fff;border-color:var(--pri)}.abtn.pri:hover{background:var(--pri-d)}
.abtn.dan{background:#fef2f2;color:#dc2626;border-color:#fecaca}.abtn.dan:hover{background:#fee2e2}
.abtn.success{background:#f0fdf4;color:#16a34a;border-color:#bbf7d0}.abtn.success:hover{background:#dcfce7}
.abtn.warn{background:#fffbeb;color:#d97706;border-color:#fde68a}.abtn.warn:hover{background:#fef3c7}
.admin-actions{margin-bottom:.8rem}
.admin-form{background:var(--bg-c);border:1px solid var(--bd);border-radius:9px;padding:1rem;margin-bottom:.8rem}
.admin-form h3{font-size:.9rem;font-weight:700;color:var(--pri-d);margin-bottom:.7rem}
.admin-form input,.admin-form select,.admin-form textarea{width:100%;padding:7px 10px;border:1px solid var(--bd);border-radius:7px;font-size:.82rem;color:var(--tx);font-family:inherit}
.admin-form input:focus,.admin-form select:focus,.admin-form textarea:focus{outline:none;border-color:var(--pri);box-shadow:0 0 0 3px rgba(42,111,151,.12)}
.admin-form textarea{min-height:100px;resize:vertical}
.form-row{display:flex;gap:8px}
.form-row input{flex:1;margin-bottom:7px}
.form-btns{display:flex;gap:6px;margin-top:.3rem}
.tools-section{background:var(--bg-c);border:1px solid var(--bd);border-radius:10px;padding:1rem;margin-bottom:.8rem}
.tools-section h3{font-size:.88rem;font-weight:700;color:var(--tx);margin-bottom:4px}
.tools-section p{font-size:.78rem;color:var(--tx-m);margin-bottom:.5rem}
.tools-section input[type="file"]{font-size:.78rem;margin-bottom:.5rem}
.setting-row{margin-bottom:7px}
.setting-row label{display:block;font-size:.73rem;font-weight:600;color:var(--tx-m);margin-bottom:2px}
.setting-row input,.setting-row select{width:100%;padding:6px 9px;border:1px solid var(--bd);border-radius:6px;font-size:.8rem;color:var(--tx)}
.setting-row input:focus{outline:none;border-color:var(--pri)}
.admin-panel .admin-body{flex:1;overflow-y:auto;padding:1.2rem}

/* User Management Styles */
.user-mgmt-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media(max-width:768px){.user-mgmt-grid{grid-template-columns:1fr}}
.user-mgmt-section{background:var(--bg-c);border:1px solid var(--bd);border-radius:12px;padding:1rem}
.user-mgmt-section h3{font-size:.92rem;font-weight:700;color:var(--pri-d);margin-bottom:.3rem;display:flex;align-items:center;gap:6px}
.user-mgmt-section .section-desc{font-size:.78rem;color:var(--tx-m);margin-bottom:.8rem}
.user-card{background:var(--bg-w);border:1px solid var(--bd);border-radius:10px;padding:.7rem .9rem;margin-bottom:.6rem;display:flex;align-items:center;gap:10px;transition:all .2s}
.user-card:hover{box-shadow:0 2px 8px rgba(0,0,0,.06)}
.user-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--pri),var(--pri-l));color:#fff;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;flex-shrink:0}
.user-info{flex:1;min-width:0}
.user-info .user-name{font-size:.85rem;font-weight:600;color:var(--tx)}
.user-info .user-phone{font-size:.75rem;color:var(--tx-m)}
.user-info .user-meta{font-size:.7rem;color:var(--tx-l);margin-top:1px}
.user-actions{display:flex;gap:4px;flex-shrink:0}
.pending-card{background:var(--bg-w);border:1px solid #fde68a;border-left:3px solid #f59e0b;border-radius:10px;padding:.7rem .9rem;margin-bottom:.6rem;display:flex;align-items:center;gap:10px}
.pending-card .user-avatar{background:linear-gradient(135deg,#f59e0b,#f97316)}
.badge-pending{display:inline-block;background:#fef3c7;color:#92400e;padding:1px 7px;border-radius:8px;font-size:.68rem;font-weight:600}
.badge-active{display:inline-block;background:#dcfce7;color:#166534;padding:1px 7px;border-radius:8px;font-size:.68rem;font-weight:600}
.empty-state{text-align:center;padding:1.5rem;color:var(--tx-l);font-size:.82rem}
.empty-state .empty-icon{font-size:1.5rem;margin-bottom:.3rem;display:block}

/* Visitor Log Styles */
.visitor-table{width:100%;border-collapse:collapse;font-size:.8rem}
.visitor-table th{background:var(--bg-c);color:var(--tx-m);padding:8px 10px;text-align:left;font-weight:600;font-size:.75rem;border-bottom:2px solid var(--bd);white-space:nowrap}
.visitor-table td{padding:7px 10px;border-bottom:1px solid var(--bg-c);vertical-align:top}
.visitor-table tr:hover td{background:var(--hl)}
.visitor-table .visitor-id{font-family:'JetBrains Mono','Courier New',monospace;font-size:.75rem;color:var(--pri-d)}
.visitor-table .visitor-actions{font-size:.73rem;color:var(--tx-m);line-height:1.5}
.visitor-online{display:inline-block;width:7px;height:7px;border-radius:50%;background:#16a34a;margin-right:4px;animation:pulse 2s infinite}
.visitor-offline{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--tx-l);margin-right:4px}

/* ===== Login Overlay ===== */
.login-overlay{position:fixed;inset:0;z-index:9999;background:linear-gradient(135deg,#14364d 0%,#1a4f6f 40%,#2a6f97 100%);display:flex;align-items:center;justify-content:center;backdrop-filter:blur(8px)}
.login-card{background:var(--bg-w);border-radius:20px;box-shadow:0 20px 60px rgba(21,32,43,.35);width:92%;max-width:420px;padding:2rem 1.8rem;animation:loginIn .4s ease}
@keyframes loginIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes shakeIn{0%,100%{transform:translateX(0)}20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}
.login-error{background:#fef2f2;border:1px solid #fecaca;color:#dc2626;padding:8px 12px;border-radius:8px;font-size:.82rem;font-weight:500;text-align:center}
.login-success{background:#f0fdf4;border:1px solid #bbf7d0;color:#16a34a;padding:8px 12px;border-radius:8px;font-size:.82rem;font-weight:500;text-align:center}
.pw-wrap{position:relative;display:flex;align-items:center}.pw-wrap input{width:100%;padding-right:38px!important}.pw-toggle{position:absolute;right:6px;background:none;border:none;cursor:pointer;font-size:.95rem;padding:4px 6px;line-height:1;opacity:.5;transition:opacity .2s}.pw-toggle:hover{opacity:1}
.login-header{text-align:center;margin-bottom:1.2rem}
.login-icon{font-size:2.2rem;margin-bottom:.3rem}
.login-header h2{font-size:1.2rem;font-weight:800;color:var(--pri-d);margin-bottom:.2rem;letter-spacing:-.3px}
.login-subtitle{font-size:.82rem;color:var(--tx-m)}
.login-tabs{display:flex;border-radius:10px;background:var(--bg-c);padding:3px;margin-bottom:1.2rem}
.login-tab{flex:1;padding:.5rem;border:none;background:none;font-size:.82rem;font-weight:600;color:var(--tx-m);border-radius:8px;cursor:pointer;transition:all .2s}
.login-tab.active{background:var(--bg-w);color:var(--pri-d);box-shadow:0 2px 8px rgba(42,111,151,.12)}
.login-form-section{display:flex;flex-direction:column;gap:.7rem}
.login-field label{display:block;font-size:.73rem;font-weight:600;color:var(--tx-m);margin-bottom:2px}
.login-field input{width:100%;padding:9px 12px;border:1px solid var(--bd);border-radius:9px;font-size:.88rem;color:var(--tx);transition:all .2s}
.login-field input:focus{outline:none;border-color:var(--pri);box-shadow:0 0 0 3px rgba(42,111,151,.12)}
.login-btn{width:100%;padding:10px;border:none;border-radius:10px;background:linear-gradient(135deg,var(--pri-d),var(--pri));color:#fff;font-size:.9rem;font-weight:700;cursor:pointer;transition:all .25s;margin-top:.3rem;letter-spacing:.3px}
.login-btn:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(42,111,151,.3)}
.login-btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.login-hint{font-size:.78rem;color:var(--tx-l);text-align:center;margin-top:.3rem}
.login-link{text-align:center;margin-top:.5rem}
.login-link a{color:var(--pri);font-size:.82rem;font-weight:600;cursor:pointer;text-decoration:none;transition:color .2s}
.login-link a:hover{color:var(--pri-d);text-decoration:underline}
.login-divider{text-align:center;margin:.5rem 0;position:relative;font-size:.75rem;color:var(--tx-l)}
.login-divider::before,.login-divider::after{content:'';position:absolute;top:50%;width:calc(50% - 30px);height:1px;background:var(--bd)}
.login-divider::before{left:0}.login-divider::after{right:0}

/* Admin Key Modal */
.admin-key-overlay{position:fixed;inset:0;z-index:800;background:rgba(21,32,43,.5);display:none;align-items:center;justify-content:center;backdrop-filter:blur(3px)}
.admin-key-card{background:var(--bg-w);border-radius:16px;padding:1.5rem;width:90%;max-width:360px;box-shadow:0 12px 48px rgba(21,32,43,.3);text-align:center;animation:loginIn .3s ease}
.admin-key-card h3{font-size:1rem;font-weight:700;color:var(--pri-d);margin-bottom:.3rem}
.admin-key-card input{width:100%;padding:9px 12px;border:1px solid var(--bd);border-radius:9px;font-size:.88rem;color:var(--tx);margin:.5rem 0}
.admin-key-card input:focus{outline:none;border-color:var(--pri);box-shadow:0 0 0 3px rgba(42,111,151,.12)}
.admin-key-btns{display:flex;gap:8px;justify-content:center;margin-top:.3rem}

/* Nav extras */
.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;width:100%;position:relative}
.nav-links.show{display:flex}
.admin-link{background:var(--pri);color:#fff!important;padding:5px 12px;border-radius:8px;font-weight:600;font-size:.8rem!important}
.admin-link:hover{background:var(--pri-d)}
.nav-logout{text-decoration:none;color:var(--tx-m);font-size:.8rem;padding:4px 8px;border-radius:6px;transition:all .2s;white-space:nowrap}
.nav-logout:hover{color:#dc2626;background:#fef2f2}

/* Chat */
#chatFab{position:fixed;bottom:1.5rem;left:1.5rem;width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--pri),var(--pri-d));color:#fff;border:none;font-size:1.3rem;cursor:pointer;z-index:300;box-shadow:0 4px 20px rgba(42,111,151,.35);transition:all .3s;display:flex;align-items:center;justify-content:center}
#chatFab:hover{transform:scale(1.08);box-shadow:0 6px 28px rgba(42,111,151,.45)}
#chatWindow{position:fixed;bottom:5rem;left:1.5rem;width:380px;max-width:calc(100vw - 2rem);height:520px;max-height:calc(100vh - 6rem);background:var(--bg-w);border-radius:16px;box-shadow:0 8px 40px rgba(21,32,43,.25);z-index:300;display:none;flex-direction:column;overflow:hidden;border:1px solid var(--bd)}
#chatWindow.open{display:flex}
.chat-hdr{background:linear-gradient(90deg,var(--pri-d),var(--pri));color:#fff;padding:.7rem .9rem;display:flex;align-items:center;justify-content:space-between;flex-shrink:0;cursor:move}
.chat-status-dot{width:8px;height:8px;border-radius:50%;display:inline-block;transition:background .3s}.chat-status-dot.offline{background:#dc2626}.chat-status-dot.online{background:#16a34a;box-shadow:0 0 6px rgba(22,163,74,.5)}.chat-status-dot.connecting{background:#f59e0b;animation:pulse 1s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
#chatMessages{flex:1;overflow-y:auto;padding:.8rem;scroll-behavior:smooth;-webkit-overflow-scrolling:touch}
#chatMessages::-webkit-scrollbar{width:5px}
#chatMessages::-webkit-scrollbar-track{background:transparent}
#chatMessages::-webkit-scrollbar-thumb{background:var(--bd);border-radius:4px}
#chatMessages::-webkit-scrollbar-thumb:hover{background:var(--pri-l)}
.chat-input-area{display:flex;gap:5px;padding:.6rem;border-top:1px solid var(--bd);background:var(--bg-c);flex-shrink:0;align-items:flex-end}
.chat-input-area textarea{flex:1;padding:7px 10px;border:1px solid var(--bd);border-radius:9px;font-size:.82rem;color:var(--tx);font-family:inherit;resize:none;max-height:80px;min-height:36px}
.chat-input-area textarea:focus{outline:none;border-color:var(--pri)}
#chatSendBtn{background:var(--pri);color:#fff;border:none;width:36px;height:36px;border-radius:9px;cursor:pointer;font-size:.85rem;flex-shrink:0;transition:all .2s}
#chatSendBtn:hover{background:var(--pri-d)}
#chatSendBtn:disabled{opacity:.5;cursor:not-allowed}
.chat-msg{max-width:85%;padding:.5rem .8rem;border-radius:11px;font-size:.82rem;line-height:1.5;word-break:break-word}
.chat-msg.user{align-self:flex-end;background:var(--pri);color:#fff;border-bottom-right-radius:4px}
.chat-msg.ai{align-self:flex-start;background:var(--bg-c);color:var(--tx);border-bottom-left-radius:4px}
.chat-msg.system{align-self:center;background:rgba(42,111,151,.08);color:var(--tx-m);font-size:.76rem;font-style:italic;border-radius:7px;max-width:95%}
.chat-msg pre{background:rgba(0,0,0,.06);padding:6px;border-radius:5px;overflow-x:auto;margin:4px 0;font-size:.8em}
.chat-msg code{font-family:'JetBrains Mono','Courier New',monospace;font-size:.9em}
.chat-msg a{color:var(--pri);text-decoration:underline}

/* Toast */
.toast{position:fixed;top:66px;right:1.5rem;z-index:600;background:var(--bg-w);border:1px solid var(--bd);border-radius:9px;padding:.7rem 1rem;box-shadow:0 4px 20px rgba(21,32,43,.12);font-size:.82rem;color:var(--tx);display:none;animation:slideIn .3s ease}
.toast.show{display:flex;align-items:center;gap:6px}
@keyframes slideIn{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}

/* Annotation Popup */
.anno-overlay{position:fixed;inset:0;background:rgba(21,32,43,.35);z-index:700;display:none;align-items:center;justify-content:center;backdrop-filter:blur(3px)}
.anno-overlay.open{display:flex}
.anno-popup{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--bg-w);border-radius:16px;box-shadow:0 12px 48px rgba(21,32,43,.3);z-index:710;display:none;width:90%;max-width:420px;max-height:80vh;overflow-y:auto;border:1px solid var(--bd)}
.anno-popup.open{display:block}
.anno-popup-hdr{background:linear-gradient(90deg,var(--pri-d),var(--pri));color:#fff;padding:.8rem 1rem;border-radius:16px 16px 0 0;display:flex;align-items:center;justify-content:space-between;font-size:.95rem;position:sticky;top:0;z-index:1}
.anno-popup-close{background:rgba(255,255,255,.2);border:none;color:#fff;width:28px;height:28px;border-radius:7px;cursor:pointer;font-size:.85rem;display:flex;align-items:center;justify-content:center}
.anno-popup-close:hover{background:rgba(255,255,255,.35)}
.anno-popup-body{padding:1rem}
.anno-section{margin-bottom:.8rem}
.anno-label{font-size:.75rem;font-weight:700;color:var(--pri-d);margin-bottom:3px}
.anno-val{font-size:.88rem;color:var(--tx);line-height:1.5;padding-left:.3rem}

/* ===== Exam System ===== */
.exam-landing{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem;max-width:700px;margin:1rem auto}
@media(max-width:600px){.exam-landing{grid-template-columns:1fr}}
.exam-card-main,.exam-card-side{background:var(--bg-w);border-radius:16px;padding:2rem;text-align:center;box-shadow:var(--sh);transition:transform .2s,box-shadow .2s}
.exam-card-main:hover,.exam-card-side:hover{transform:translateY(-2px);box-shadow:var(--sh-h)}
.exam-icon{font-size:2.5rem;margin-bottom:.5rem}
.exam-card-main h3{font-size:1.15rem;font-weight:700;color:var(--pri-d);margin-bottom:.3rem}
.exam-card-side h3{font-size:1rem;font-weight:700;color:var(--pri-d);margin-bottom:.3rem}
.exam-card-main p,.exam-card-side p{font-size:.82rem;color:var(--tx-m)}
.exam-info{display:flex;flex-direction:column;gap:4px;margin:.8rem 0;font-size:.78rem;color:var(--tx-l)}
.exam-start-btn{background:linear-gradient(135deg,var(--pri-d),var(--pri));color:#fff;border:none;padding:12px 32px;border-radius:12px;font-size:.95rem;font-weight:700;cursor:pointer;transition:all .25s}
.exam-start-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(26,79,111,.3)}
.exam-hint{font-size:.72rem;color:var(--tx-l);margin-top:.6rem}
.exam-overlay{position:fixed;inset:0;z-index:600;background:rgba(21,32,43,.6);display:flex;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
.exam-container{background:var(--bg-w);border-radius:20px;width:95%;max-width:680px;max-height:90vh;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(21,32,43,.3)}
.exam-topbar{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;border-bottom:1px solid var(--bd);font-weight:700;font-size:.95rem}
.exam-progress{display:flex;align-items:center;gap:8px;font-size:.8rem;color:var(--tx-m);font-weight:500}
.exam-progress-bar{width:120px;height:6px;background:var(--bg-c);border-radius:3px;overflow:hidden}
.exam-progress-fill{height:100%;background:linear-gradient(90deg,var(--pri),var(--pri-l));border-radius:3px;transition:width .3s}
.exam-close{background:none;border:none;font-size:1.2rem;cursor:pointer;color:var(--tx-m);padding:4px 8px;border-radius:6px;transition:all .2s}
.exam-close:hover{color:#dc2626;background:#fef2f2}
.exam-content{flex:1;overflow-y:auto;padding:1.5rem}
.exam-bottombar{display:flex;align-items:center;justify-content:center;gap:10px;padding:1rem 1.5rem;border-top:1px solid var(--bd)}
.exam-question{max-width:100%}
.exam-q-num{font-size:.75rem;color:var(--tx-l);margin-bottom:.3rem}
.exam-q-text{font-size:1rem;font-weight:600;line-height:1.6;margin-bottom:1rem;color:var(--tx)}
.exam-options{display:flex;flex-direction:column;gap:8px}
.exam-option{display:flex;align-items:center;gap:10px;padding:12px 16px;border:2px solid var(--bd);border-radius:12px;cursor:pointer;transition:all .2s;font-size:.88rem}
.exam-option:hover{border-color:var(--pri-l);background:var(--tag-b)}
.exam-option.selected{border-color:var(--pri);background:var(--tag-b);font-weight:600}
.exam-option input[type="radio"]{display:none}
.exam-opt-letter{width:28px;height:28px;border-radius:50%;background:var(--bg-c);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.8rem;color:var(--tx-m);flex-shrink:0;transition:all .2s}
.exam-option.selected .exam-opt-letter{background:var(--pri);color:#fff}
.exam-opt-text{line-height:1.4}
.exam-result-container{background:var(--bg-w);border-radius:20px;width:95%;max-width:680px;max-height:90vh;overflow-y:auto;padding:2rem;box-shadow:0 20px 60px rgba(21,32,43,.3);text-align:center}
.exam-score-circle{width:120px;height:120px;border-radius:50%;border:6px solid var(--pri);display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 1rem}
.exam-score-circle span{font-size:2.8rem;font-weight:800;color:var(--pri-d);line-height:1}
.exam-score-circle small{font-size:.8rem;color:var(--tx-m)}
.exam-score-title{font-size:1.3rem;font-weight:800;margin-bottom:.3rem}
#examScoreDetail{color:var(--tx-m);font-size:.88rem;margin-bottom:1.2rem}
.exam-wrong-list{text-align:left;margin:1rem 0;max-height:300px;overflow-y:auto}
.exam-wrong-list h3{font-size:.88rem;font-weight:700;margin-bottom:.5rem;color:#dc2626}
.exam-wrong-item{background:var(--bg-c);border-radius:10px;padding:.8rem;margin-bottom:.6rem;font-size:.82rem}
.exam-wrong-q{font-weight:600;margin-bottom:4px;line-height:1.5}
.exam-wrong-opts{display:flex;gap:12px;font-size:.78rem;flex-wrap:wrap}
.exam-result-btns{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:1rem}
.exam-history{margin-top:1.5rem;max-width:700px;margin-left:auto;margin-right:auto}
.exam-history h3{font-size:.9rem}
.exam-history-list{display:flex;flex-direction:column;gap:6px}
.exam-history-item{display:flex;align-items:center;gap:12px;background:var(--bg-w);border-radius:10px;padding:.6rem 1rem;box-shadow:0 1px 4px rgba(0,0,0,.05);font-size:.82rem}
.exam-h-score{font-weight:800;font-size:1.1rem;min-width:50px}
.exam-history-item span:nth-child(2){color:var(--tx-m);flex:1}
.exam-history-item span:nth-child(3){color:var(--tx-l);font-size:.78rem}

/* Responsive */
@media(max-width:768px){
.nav-links{display:none;flex-direction:column;position:absolute;top:56px;left:0;right:0;background:rgba(255,255,255,.97);padding:.7rem;border-bottom:1px solid var(--bd);gap:.3rem;align-items:stretch}
.nav-links.show{display:flex}.nav-links.open{display:flex}.nav-toggle{display:block}
.hero{padding:2.2rem 1rem 1.8rem}.hero-stats{gap:.7rem}.hero-stat,.stat-item{min-width:75px;padding:.5rem .7rem}
.container{padding:0 .8rem}.section{padding:1.5rem 0}
.chat-window{width:calc(100vw - 1rem);left:.5rem;bottom:4.5rem;height:calc(100vh - 5.5rem)}
.admin-panel{width:98%;max-width:98%;max-height:95vh}
.admin-tabs{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch}
.mindmap-tree{font-size:.8rem}.mm-branch{padding-left:.8rem}.mm-children{padding-left:.6rem}
.anno-popup{width:95%;max-width:95%}
.footer-content{flex-direction:column;gap:1rem}
.chat-window{bottom:4.5rem}
#chatFab{bottom:1rem;left:1rem;width:42px;height:42px;font-size:1.1rem}
.user-mgmt-grid{grid-template-columns:1fr}
.visitor-table{font-size:.73rem}
.visitor-table th,.visitor-table td{padding:5px 6px}
}
@media(max-width:480px){.hero h1{font-size:1.3rem}.modules-grid,.gg{grid-template-columns:1fr}.footer-content{flex-direction:column}}