:root{--primary:#4f46e5;--primary-dark:#4338ca;--primary-light:#818cf8;--secondary:#64748b;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--info:#06b6d4;--bg:#f1f5f9;--card:#ffffff;--text:#1e293b;--text-muted:#94a3b8;--border:#e2e8f0;--shadow:0 1px 3px rgba(0,0,0,.08);--shadow-md:0 4px 6px rgba(0,0,0,.07);--shadow-lg:0 10px 15px rgba(0,0,0,.1);--radius:12px;--radius-sm:8px;--transition:all .2s ease}
*{box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Noto Sans SC',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-dark)}
main{flex:1;padding-top:20px;padding-bottom:40px}

/* ===== Navbar ===== */
.navbar{background:linear-gradient(135deg,var(--primary),var(--primary-dark))!important;box-shadow:var(--shadow-md);padding:.6rem 0}
.navbar-brand{font-size:1.2rem;font-weight:700;color:#fff!important}
.nav-link{color:rgba(255,255,255,.85)!important;font-weight:500;padding:.5rem 1rem!important;border-radius:var(--radius-sm);transition:var(--transition)}
.nav-link:hover,.nav-link.active{color:#fff!important;background:rgba(255,255,255,.15)}
.dropdown-menu{border:none;box-shadow:var(--shadow-lg);border-radius:var(--radius);padding:.5rem;margin-top:8px;background:#fff}
.dropdown-item{color:var(--text);border-radius:var(--radius-sm);padding:.5rem 1rem;margin:2px 0;transition:var(--transition)}
.dropdown-item:hover{background:var(--bg);color:var(--primary);transform:translateX(4px)}

/* ===== Cards ===== */
.card{border:none;border-radius:var(--radius);box-shadow:var(--shadow);transition:var(--transition);background:#fff}
.card:hover{box-shadow:var(--shadow-md)}
.card-header{background:transparent;border-bottom:1px solid var(--border);padding:1rem 1.25rem;font-weight:600}
.card-body{padding:1.25rem}

/* ===== Content Section ===== */
.content-section{background:#fff;border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow);margin-bottom:1.5rem}
.content-section h2{font-size:1.2rem;font-weight:700;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:2px solid var(--primary);color:var(--text)}

/* ===== Buttons ===== */
.btn{border-radius:var(--radius-sm);font-weight:600;padding:.5rem 1.25rem;transition:var(--transition);border:none}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}
.btn-primary:hover{background:linear-gradient(135deg,var(--primary-dark),#3730a3);color:#fff}
.btn-outline-primary{border:2px solid var(--primary);color:var(--primary);background:transparent}
.btn-outline-primary:hover{background:var(--primary);color:#fff}
.btn-success{background:linear-gradient(135deg,var(--success),#059669);color:#fff}
.btn-danger{background:linear-gradient(135deg,var(--danger),#dc2626);color:#fff}
.btn-lg{padding:.7rem 2rem;font-size:1.05rem}

/* ===== Forms ===== */
.form-control,.form-select{border-radius:var(--radius-sm);border:2px solid var(--border);padding:.6rem 1rem;transition:var(--transition);color:var(--text)}
.form-control:focus,.form-select:focus{border-color:var(--primary-light);box-shadow:0 0 0 3px rgba(79,70,229,.15)}
.form-label{font-weight:600;color:var(--text);margin-bottom:.4rem;font-size:.9rem}
.input-group .form-control{border-right:none}
.input-group .input-group-text{background:var(--bg);border:2px solid var(--border);border-left:none;border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--secondary)}

/* ===== Badges ===== */
.badge{font-weight:600;padding:.4em .7em;border-radius:6px;font-size:.78rem}

/* ===== Alerts ===== */
.alert{border-radius:var(--radius);border:none;padding:1rem 1.25rem;font-weight:500}
.alert-success{background:#ecfdf5;color:#065f46;border-left:4px solid var(--success)}
.alert-danger{background:#fef2f2;color:#991b1b;border-left:4px solid var(--danger)}
.alert-warning{background:#fffbeb;color:#92400e;border-left:4px solid var(--warning)}
.alert-info{background:#ecfeff;color:#155e75;border-left:4px solid var(--info)}

/* ===== Table ===== */
.table{color:var(--text);border-color:var(--border)}
.table th{background:var(--bg);font-weight:700;color:var(--text);font-size:.85rem;border-bottom:2px solid var(--border)}
.table td{color:var(--text);vertical-align:middle;padding:.85rem 1rem}

/* ===== Pagination ===== */
.page-link{border-radius:var(--radius-sm)!important;margin:0 3px;border:2px solid var(--border);color:var(--text);font-weight:600}
.page-link:hover{background:var(--primary);border-color:var(--primary);color:#fff}
.page-item.active .page-link{background:var(--primary);border-color:var(--primary);color:#fff}

/* ===== List Group - 核心修复 ===== */
.list-group-item{border-color:var(--border);transition:var(--transition);padding:.75rem 1rem;color:var(--text);background:#fff;text-decoration:none;display:block}
.list-group-item:hover{background:#f8f9fa;color:var(--text)}
.list-group-item.active{background:var(--primary)!important;border-color:var(--primary)!important;color:#fff!important}
.list-group-item.active:hover{background:var(--primary-dark)!important;color:#fff!important}

/* ===== Modal ===== */
.modal-content{border:none;border-radius:var(--radius);box-shadow:var(--shadow-lg)}
.modal-header{border-bottom:1px solid var(--border)}
.modal-footer{border-top:1px solid var(--border)}
.modal-body{color:var(--text)}

/* ===== Progress ===== */
.progress{border-radius:var(--radius);background:var(--bg)}
.progress-bar{border-radius:var(--radius);color:#fff}

/* ===== System Cards ===== */
.system-card{text-align:center;cursor:pointer}
.system-card .icon{font-size:2.5rem;color:var(--primary);margin-bottom:.5rem;transition:var(--transition)}
.system-card:hover .icon{transform:scale(1.15);color:var(--primary-dark)}
.system-card h5{font-size:.95rem;font-weight:600;margin:0;color:var(--text)}

/* ===== Article Cards ===== */
.article-card{cursor:pointer}
.article-card .card-title{font-size:1.05rem;font-weight:600;line-height:1.4}
.article-card .card-title a{color:var(--text)}
.article-card .card-title a:hover{color:var(--primary)}
.article-card .card-text{color:var(--text-muted);font-size:.9rem}
.article-card .article-meta{font-size:.8rem;color:var(--text-muted)}

/* ===== Hero ===== */
.hero-section{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-radius:var(--radius);padding:3rem;margin-bottom:2rem;position:relative;overflow:hidden}
.hero-section::before{content:'';position:absolute;top:-50%;right:-20%;width:500px;height:500px;background:radial-gradient(circle,rgba(255,255,255,.1),transparent);border-radius:50%}
.hero-section::after{content:'';position:absolute;bottom:-30%;left:-10%;width:400px;height:400px;background:radial-gradient(circle,rgba(255,255,255,.08),transparent);border-radius:50%}
.hero-section h1{font-size:2.5rem;font-weight:800;margin-bottom:1rem;position:relative;z-index:1;color:#fff}
.hero-section p{font-size:1.15rem;opacity:.9;position:relative;z-index:1;color:#fff}

/* ===== Auth Pages ===== */
.auth-container{max-width:450px;margin:0 auto}
.auth-card{border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden}
.auth-card .auth-header{text-align:center;padding:2rem 2.5rem;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}
.auth-card .auth-header i{font-size:3rem;margin-bottom:1rem;opacity:.9;color:#fff}
.auth-card .auth-header h3{margin:0;font-weight:700;color:#fff}
.auth-card .auth-header p{margin:.5rem 0 0;opacity:.8;color:#fff}
.auth-card .auth-body{padding:2rem 2.5rem}

/* ===== Stats ===== */
.stat-card{border-radius:var(--radius);padding:1.25rem;color:#fff;position:relative;overflow:hidden;transition:var(--transition)}
.stat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.stat-card::after{content:'';position:absolute;top:-20px;right:-20px;width:80px;height:80px;background:rgba(255,255,255,.1);border-radius:50%}
.stat-card h6{color:#fff;font-size:.85rem;font-weight:600;margin:0;opacity:.9;text-transform:uppercase;letter-spacing:.5px}
.stat-card h2{color:#fff;font-size:2rem;font-weight:800;margin:.5rem 0 0}

/* ===== Footer ===== */
.footer-section{background:linear-gradient(135deg,#1e293b,#0f172a);color:#94a3b8;padding:3rem 0 1.5rem;margin-top:auto}
.footer-section h5,.footer-section h6{color:#f1f5f9;margin-bottom:1rem;font-weight:700}
.footer-section a{color:#94a3b8}
.footer-section a:hover{color:#fff}
.footer-section hr{border-color:#334155;margin:1.5rem 0}
.footer-section .icp-link{color:#64748b;font-size:.85rem}
.footer-section .icp-link:hover{color:#f1f5f9}

/* ===== Article Content ===== */
.article-content img{max-width:100%;height:auto;border-radius:8px;margin:10px 0}
.article-content video{max-width:100%;border-radius:8px;margin:10px 0}
.article-content table{width:100%;border-collapse:collapse;margin:10px 0}
.article-content table th,.article-content table td{border:1px solid #ddd;padding:8px;text-align:left}
.article-content table th{background:#f8f9fa}
.article-content hr{margin:20px 0;border:none;border-top:1px solid #ddd}

/* ===== Responsive ===== */
@media(max-width:991px){
    .navbar-collapse{padding:1rem 0}
    .nav-link{padding:.4rem .8rem!important;font-size:.9rem}
}
@media(max-width:768px){
    .hero-section{padding:2rem 1.5rem}
    .hero-section h1{font-size:1.8rem}
    .hero-section p{font-size:1rem}
    .auth-card .auth-body,.auth-card .auth-header{padding:1.5rem}
    .content-section{padding:1rem}
    .stat-card h2{font-size:1.5rem}
    .stat-card h6{font-size:.75rem}
    .card-body{padding:1rem}
    .card-header{padding:.75rem 1rem}
    .btn{padding:.4rem 1rem;font-size:.875rem}
    .btn-lg{padding:.6rem 1.5rem;font-size:.95rem}
    .table td,.table th{padding:.6rem .5rem;font-size:.85rem}
    .list-group-item{padding:.6rem .75rem;font-size:.9rem}
    .modal-content{margin:.5rem;border-radius:var(--radius-sm)}
    .pagination{flex-wrap:wrap;gap:4px}
    .page-link{padding:.3rem .6rem;font-size:.85rem}
    main{padding-top:10px;padding-bottom:20px}
}
@media(max-width:575px){
    .hero-section{padding:1.5rem 1rem;border-radius:var(--radius-sm)}
    .hero-section h1{font-size:1.5rem}
    .hero-section .btn{font-size:.85rem;padding:.5rem 1rem}
    .stat-card{padding:1rem}
    .stat-card h2{font-size:1.3rem}
    .stat-card h6{font-size:.7rem}
    .content-section{padding:.75rem;margin-bottom:1rem}
    .content-section h2{font-size:1rem}
    .card{border-radius:var(--radius-sm)}
    .d-flex.gap-2{flex-direction:column}
    .d-flex.gap-2 .btn{width:100%}
    .form-control,.form-select{padding:.5rem .75rem;font-size:.9rem}
    .navbar-brand{font-size:1rem}
    .navbar-brand i{font-size:1.1rem}
}
/* ===== Animations ===== */
.fade-in{animation:fadeIn .3s ease-in}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.slide-up{animation:slideUp .4s ease-out}
@keyframes slideUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}