:root{--brand:#2563eb;--brand-2:#1d4ed8;--brand-3:#3b82f6;--bg:#F5F5F5;--card:#FFFFFF;--card-2:#F9FAFB;--text:#333333;--muted:#8A8A8A;--border:#E6E6E6;--shadow:0 2px 10px rgba(0, 0, 0, 0.08);--radius:12px;--success:#16a34a;--success-bg:#dcfce7;--warning:#f59e0b;--warning-bg:#fff3e0;--info:#2563eb;--info-bg:#e3f2fd;--danger:#dc2626;--danger-bg:#ffe5e5;--surface:#ffffff;--surface-muted:#f9fafb;--surface-soft:#f3f4f6;--border-soft:#e0e0e0;--success-2:#8bc34a;--warning-2:#ffb74d}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Source Han Sans CN','PingFang SC','Microsoft YaHei',sans-serif;background-color:var(--bg);background-image:radial-gradient(circle at 10% 10%,rgba(79,70,229,.08),transparent 35%),radial-gradient(circle at 90% 0,rgba(124,58,237,.1),transparent 40%);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}body.page-ready .page-content{opacity:1;transform:translateY(0)}a{color:inherit}.text-muted{color:var(--muted)}.card-surface{background:var(--card);border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow)}.card-surface.soft{background:var(--card-2)}.page-container{min-height:100vh;display:flex;flex-direction:column}.page-header{background:linear-gradient(135deg,var(--brand) 0,var(--brand-2) 50%,var(--brand-3) 100%);color:#fff;padding:10px 16px;display:flex;align-items:center;position:sticky;top:0;z-index:100;box-shadow:0 2px 10px rgba(79,70,229,.2);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.15);min-height:50px}.page-header h1{font-size:16px;font-weight:600;position:absolute;left:50%;transform:translateX(-50%);letter-spacing:.5px;text-shadow:0 1px 2px rgba(0,0,0,.1);margin:0;white-space:nowrap}.page-header .header-subtitle{font-size:12px;opacity:.85;margin-left:6px}.back-btn{background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.2);color:#fff;font-size:18px;cursor:pointer;padding:6px 10px;border-radius:6px;transition:all .2s;display:flex;align-items:center;justify-content:center}.back-btn:hover{background:rgba(255,255,255,.25);transform:translateX(-2px)}.header-right{display:flex;align-items:center;gap:12px}.user-info{display:flex;align-items:center;gap:8px;padding:4px 10px;transition:all .2s;margin-left:auto}.user-info:hover{background:rgba(255,255,255,.2)}.page-content{flex:1;padding:20px;padding-bottom:80px;max-width:750px;width:100%;margin:0 auto;opacity:0;transform:translateY(6px);transition:opacity .3s ease,transform .3s ease}.section-title{font-size:16px;font-weight:600;margin-bottom:12px;color:var(--text);display:flex;align-items:center;gap:6px}.section-title .dot{width:8px;height:8px;border-radius:50%;background:var(--brand)}@media (max-width:480px){.page-content{padding:16px;padding-bottom:90px}}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:var(--card);display:flex;justify-content:space-around;padding:10px 0;box-shadow:0 -2px 8px rgba(0,0,0,.08);z-index:100}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{filter:brightness(.96)}.btn-secondary{background:#f3f4f6;color:#111827}.btn-secondary:hover{background:#e5e7eb}.nav-item{display:flex;flex-direction:column;align-items:center;text-decoration:none;color:var(--muted);font-size:12px;padding:5px;transition:color .3s}.nav-item.active{color:var(--brand)}.nav-icon{font-size:20px;margin-bottom:2px;transition:transform .2s ease}.nav-item.active .nav-icon{transform:translateY(-1px) scale(1.05)}.nav-text{font-size:11px}.btn{padding:12px 24px;border:none;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:all .3s}.btn:disabled,button:disabled{cursor:not-allowed;opacity:.6}.btn:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid rgba(79,70,229,.35);outline-offset:2px}.form-input,input[type=email],input[type=number],input[type=password],input[type=text],select,textarea{border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:14px;background:#fff;color:var(--text);transition:border-color .2s ease,box-shadow .2s ease}.input-hint{font-size:12px;color:var(--muted);margin-top:6px}.badge{display:inline-flex;align-items:center;gap:4px;padding:4px 10px;border-radius:999px;font-size:12px;font-weight:500;background:rgba(79,70,229,.12);color:var(--brand)}.form-input:focus,input[type=email]:focus,input[type=number]:focus,input[type=password]:focus,input[type=text]:focus,select:focus,textarea:focus{outline:0;border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.12)}.action-card,.activity-card,.alumni-card,.btn,.competition-item,.info-card,.message-card,.product-card,.roadmap-item,button{transition:transform .2s ease,box-shadow .2s ease,filter .2s ease}.action-card:active,.activity-card:active,.alumni-card:active,.btn:active,.competition-item:active,.info-card:active,.message-card:active,.product-card:active,.roadmap-item:active,button:active{transform:translateY(1px)}.action-card:hover,.activity-card:hover,.alumni-card:hover,.competition-item:hover,.info-card:hover,.message-card:hover,.product-card:hover,.roadmap-item:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(0,0,0,.08)}@media (prefers-reduced-motion:reduce){.action-card,.activity-card,.alumni-card,.btn,.competition-item,.message-card,.product-card,.roadmap-item,button{transition:none}}.empty-state{background:var(--card);border:1px dashed var(--border);border-radius:var(--radius);padding:24px;text-align:center;color:var(--muted);animation:fadeInUp .25s ease both}.empty-state .empty-icon{font-size:28px;margin-bottom:6px}.empty-state .empty-text{font-size:14px;color:var(--text);margin-bottom:4px}.empty-state .empty-hint{font-size:12px}.toast-container{position:fixed;top:16px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;gap:8px;z-index:9999;width:min(92vw,360px);pointer-events:none}.toast{display:flex;align-items:center;gap:8px;padding:10px 14px;background:var(--card);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow);font-size:13px;color:var(--text);opacity:0;transform:translateY(-6px);transition:opacity .2s ease,transform .2s ease;pointer-events:auto}.toast.show{opacity:1;transform:translateY(0)}.toast.success{border-left:4px solid #16a34a}.toast.error{border-left:4px solid #dc2626}.search-input-wrap{position:relative;width:100%}.search-input-wrap .search-input{padding-right:40px}.search-clear-btn{position:absolute;right:10px;top:50%;transform:translateY(-50%);width:24px;height:24px;border-radius:50%;border:none;background:rgba(148,163,184,.2);color:#64748b;font-size:18px;line-height:1;cursor:pointer;display:none}.search-clear-btn.show{display:inline-flex;align-items:center;justify-content:center}.app-modal-overlay{position:fixed;inset:0;background:rgba(15,23,42,.45);display:flex;align-items:center;justify-content:center;z-index:10000;padding:16px;animation:modalFadeIn .18s ease}.app-modal-overlay.hide{opacity:0;transform:translateY(6px)}.app-modal-card{width:min(92vw,360px);background:#fff;border-radius:16px;box-shadow:0 16px 30px rgba(15,23,42,.2);border:1px solid rgba(226,232,240,.8);padding:16px;text-align:center}.app-modal-header{font-size:16px;font-weight:600;color:var(--text);margin-bottom:8px}.app-modal-body{font-size:14px;color:var(--muted);margin-bottom:16px;line-height:1.5}.app-modal-actions{display:flex;gap:10px}.app-modal-actions .btn{flex:1}.sug-wrap{position:relative;width:100%}.sug-panel{position:absolute;top:calc(100% + 6px);left:0;right:0;background:#fff;border-radius:12px;border:1px solid rgba(226,232,240,.9);box-shadow:0 12px 24px rgba(15,23,42,.12);z-index:20;padding:6px;display:none;max-height:240px;overflow-y:auto}.sug-wrap.sug-up .sug-panel{top:auto;bottom:calc(100% + 6px)}.sug-item{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;cursor:pointer;transition:background .2s ease}.sug-item:hover{background:#f1f5ff}.sug-name{font-size:13px;color:var(--text);font-weight:600}.sug-right{margin-left:auto;display:flex;align-items:center;gap:6px}.sug-grade{font-size:12px;color:var(--muted)}.sug-gender{font-size:11px;padding:1px 6px;border-radius:10px;color:#fff;line-height:16px}.sug-gender.male{background:#3d7dff}.sug-gender.female{background:#ff5c7a}@keyframes modalFadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.loading-overlay{position:fixed;inset:0;background:rgba(255,255,255,.6);display:flex;align-items:center;justify-content:center;z-index:9998;backdrop-filter:blur(2px)}body.is-loading{overflow:hidden}body.modal-open{overflow:hidden}.loading-box{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;box-shadow:var(--shadow);display:flex;align-items:center;gap:10px;color:var(--text);font-size:13px}.loading-overlay .loading-spinner{width:18px;height:18px;border:2px solid rgba(0,0,0,.1);border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.modal{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.modal-content{background:#fff;border-radius:12px;max-width:400px;width:100%;max-height:90vh;overflow-y:auto}.modal-header{padding:20px;border-bottom:1px solid #e0e0e0;display:flex;align-items:center;justify-content:space-between}.modal-header h3{font-size:16px;font-weight:600;color:#333}.close-btn{background:0 0;border:none;font-size:24px;color:#999;cursor:pointer;padding:0;width:30px;height:30px;display:flex;align-items:center;justify-content:center}.modal-body{padding:20px}.form-input:disabled,.form-textarea:disabled,input:disabled,select:disabled,textarea:disabled{background-color:#f5f5f5;color:#999}.form-textarea{resize:vertical;font-family:inherit}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-size:14px;font-weight:500;color:var(--text)}.form-actions{display:flex;gap:10px;margin-top:20px}.form-actions .btn{flex:1}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 20px;color:var(--muted)}.loading .loading-spinner{width:40px;height:40px;border:3px solid rgba(0,0,0,.08);border-top-color:var(--brand);border-radius:50%;animation:spin 1s linear infinite;margin-bottom:15px}@keyframes fadeInUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.empty-state .empty-icon{font-size:48px;margin-bottom:15px}.empty-state p{font-size:14px}.error-message{background:var(--danger-bg);color:var(--danger);padding:12px 15px;border-radius:8px;margin-bottom:15px;font-size:14px}.success-message{background:var(--success-bg);color:#388e3c;padding:12px 15px;border-radius:8px;margin-bottom:15px;font-size:14px}.user-avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--brand) 0,var(--brand-2) 50%,var(--brand-3) 100%);display:flex;align-items:center;justify-content:center;font-size:14px;color:#fff;font-weight:600;box-shadow:0 2px 8px rgba(79,70,229,.3)}.header-avatar-img{width:32px;height:32px;border-radius:50%;border:2px solid rgba(255,255,255,.3);box-shadow:0 2px 8px rgba(79,70,229,.3)}.header-avatar-link{display:inline-block;text-decoration:none;transition:transform .3s;border-radius:50%;overflow:hidden}.header-avatar-link:hover{transform:scale(1.1)}.header-avatar-link .user-avatar{width:32px;height:32px;border-radius:50%;border:2px solid rgba(255,255,255,.3);box-shadow:0 2px 8px rgba(79,70,229,.3)}.user-name{font-size:14px;font-weight:500}.badge{display:inline-block;padding:4px 8px;border-radius:4px;font-size:12px;font-weight:500}.badge-success{background:var(--success-bg);color:#388e3c}.badge-warning{background:var(--warning-bg);color:#f57c00}.badge-info{background:var(--info-bg);color:#1976d2}.badge-danger{background:var(--danger-bg);color:#d32f2f}@media (max-width:375px){.page-content{padding:15px}.btn{padding:10px 20px;font-size:13px}}@media (min-width:751px){.page-container{max-width:750px;margin:0 auto;box-shadow:0 0 20px rgba(0,0,0,.1)}.bottom-nav{max-width:750px;left:50%;transform:translateX(-50%)}}.page-container,body{min-height:100vh;min-height:100dvh}body{overflow-x:hidden;overscroll-behavior-y:contain}body.relationships-loading{overflow:hidden;touch-action:none;overscroll-behavior:none}.page-content{display:flex;flex-direction:column;gap:12px}.relation-tabs{display:flex;gap:10px;background:#fff;border-radius:14px;padding:8px;border:1px solid var(--border);box-shadow:var(--shadow)}.tab-btn{border:none;background:#f1f5ff;color:#4c5cf0;padding:8px 14px;border-radius:999px;font-size:13px;cursor:pointer;transition:all .2s ease}.tab-btn.active{background:linear-gradient(135deg,#5b8bff 0,#4a6cf7 45%,#3659f5 100%);color:#fff;box-shadow:0 8px 18px rgba(54,89,245,.25)}.network-container{background:var(--card);border-radius:20px;border:1px solid rgba(99,102,241,.18);box-shadow:0 16px 32px rgba(15,23,42,.12);padding:0;height:calc(100vh - 330px);min-height:380px;position:relative;overflow:hidden;touch-action:none}#networkLoading{position:absolute;inset:0;z-index:6;background:rgba(255,255,255,.86);backdrop-filter:blur(2px);pointer-events:auto;touch-action:none}.fullscreen-btn{position:absolute;top:12px;right:12px;z-index:5;border:none;background:rgba(255,255,255,.9);color:#3b82f6;border-radius:999px;padding:6px 12px;font-size:12px;box-shadow:0 6px 14px rgba(15,23,42,.12);cursor:pointer}.network-container.is-fullscreen{position:fixed;inset:0;z-index:9999;border-radius:0;height:100vh;min-height:100vh}.network-container.is-fullscreen .fullscreen-btn{background:rgba(15,23,42,.8);color:#fff}#networkVis{width:100%;height:100%;touch-action:none;background:radial-gradient(circle at 20% 20%,rgba(99,102,241,.08),transparent 55%),radial-gradient(circle at 80% 10%,rgba(59,130,246,.08),transparent 45%),radial-gradient(circle at 50% 80%,rgba(14,165,233,.08),transparent 50%)}@media (max-width:560px){.network-container{height:calc(100vh - 320px);min-height:320px}.relation-tabs{flex-wrap:wrap}.tab-btn{flex:1;text-align:center;min-width:0}}.node-info-panel{margin-top:12px;background:#fff;border-radius:16px;border:1px solid var(--border);box-shadow:0 14px 28px rgba(15,23,42,.1);padding:12px 14px 14px}.panel-title{font-weight:600;font-size:14px;color:var(--text);margin-bottom:8px}.panel-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 12px}.panel-item{display:flex;align-items:center;justify-content:space-between;background:#f5f7ff;border-radius:10px;padding:8px 10px;font-size:12px}.panel-item .label{color:var(--muted)}.panel-item .value{color:var(--text);font-weight:600}