/* 全局样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root{
  /* 主色调 */
  --primary-color:#2563eb; --primary-hover:#1d4ed8; --primary-light:#dbeafe;
  /* 辅助色 */
  --secondary-color:#64748b; --success-color:#10b981; --warning-color:#f59e0b; --error-color:#ef4444;
  /* 中性色 */
  --gray-50:#f8fafc; --gray-100:#f1f5f9; --gray-200:#e2e8f0; --gray-300:#cbd5e1;
  --gray-400:#94a3b8; --gray-500:#64748b; --gray-600:#475569; --gray-700:#334155;
  --gray-800:#1e293b; --gray-900:#0f172a;
  /* 背景色 */
  --bg-primary:#ffffff; --bg-secondary:#f8fafc; --bg-tertiary:#f1f5f9;
  /* 文字色 */
  --text-primary:#0f172a; --text-secondary:#475569; --text-muted:#64748b;
  /* 边框 & 圆角 */
  --border-color:#e2e8f0; --border-radius:10px; --border-radius-lg:14px;
  /* 阴影 */
  --shadow-sm:0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow:0 1px 3px 0 rgb(0 0 0 / 0.10), 0 1px 2px -1px rgb(0 0 0 / 0.10);
  --shadow-md:0 6px 10px -2px rgb(0 0 0 / 0.12), 0 3px 6px -4px rgb(0 0 0 / 0.10);
  --shadow-lg:0 16px 32px -8px rgb(0 0 0 / 0.18);
  /* 动画 & 布局 */
  --transition:all .2s ease; --transition-slow:all .35s ease;
  --sidebar-width:260px; --navbar-height:64px;
}

html { scroll-behavior:smooth; }
body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  line-height:1.6; color:var(--text-primary); background:var(--bg-secondary);
  overflow-x:hidden;
}

/* 自定义滚动条 */
*::-webkit-scrollbar{width:10px;height:10px}
*::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:8px;border:2px solid transparent;background-clip:content-box}
*::-webkit-scrollbar-thumb:hover{background:var(--gray-400)}
*{scrollbar-color:var(--gray-300) transparent; scrollbar-width:thin}

/* 加载动画 */
.loading-overlay{position:fixed;inset:0;background:rgba(255,255,255,.95);display:flex;align-items:center;justify-content:center;z-index:9999;backdrop-filter:blur(4px)}
.loading-spinner{text-align:center}
.spinner{width:44px;height:44px;border:4px solid var(--gray-200);border-top:4px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 16px}
@keyframes spin{to{transform:rotate(360deg)}}

/* 登录页 */
.login-page{min-height:100vh;display:flex;position:relative;overflow:hidden}
.login-container{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2.5rem;background:var(--bg-primary);z-index:2}
.login-header{text-align:center;margin-bottom:2rem}
.logo{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:10px}
.logo i{font-size:2rem;color:var(--primary-color)}
.logo h1{font-size:1.9rem;font-weight:800;color:var(--text-primary);letter-spacing:.2px}
.subtitle{color:var(--text-secondary);font-size:.95rem}
.login-form{width:100%;max-width:400px}
.form-group{margin-bottom:1.5rem}
.form-group label{display:block;margin-bottom:.5rem;font-weight:600;color:var(--text-primary)}
.input-group{position:relative;display:flex;align-items:center}
.input-group i{position:absolute;left:12px;color:var(--text-muted);z-index:1}
.input-group input{
  width:100%;padding:12px 16px 12px 40px;border:2px solid var(--border-color);
  border-radius:12px;font-size:.95rem;transition:var(--transition);background:var(--bg-primary);
  box-shadow:inset 0 1px 0 rgb(0 0 0 / .02);
}
.input-group input:focus{
  outline:none;border-color:var(--primary-color);box-shadow:0 0 0 4px var(--primary-light);
}
.toggle-password{
  position:absolute;right:12px;background:none;border:none;color:var(--text-muted);
  cursor:pointer;padding:6px;border-radius:8px;transition:var(--transition)
}
.toggle-password:hover{color:var(--text-primary);background:var(--gray-100)}

.login-btn{
  width:100%;padding:12px 24px;background:linear-gradient(135deg,var(--primary-color),#1e40af);
  color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;
  transition:transform .15s ease, box-shadow .15s ease;display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:1rem
}
.login-btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}
.login-btn:active{transform:translateY(0)}

.login-footer{text-align:center}
.login-footer p{color:var(--text-muted);font-size:.875rem}

/* 右侧动态背景（颜色变化 & 轻微位移） */
.login-bg{
  flex:1;position:relative;overflow:hidden;
  background:linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
  background-size:200% 200%;
  animation:gradientShift 12s ease-in-out infinite;
}
.bg-pattern{
  position:absolute;inset:0;
  background-image:
    radial-gradient(circle at 25% 25%, rgba(255,255,255,0.12) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(255,255,255,0.12) 0%, transparent 50%);
  background-size:120px 120px, 140px 140px;
  /* 颜色轮换 + 纹理微动 */
  animation:
    hueRotate 28s linear infinite,
    floatDots 18s ease-in-out infinite alternate;
  mix-blend-mode:overlay;
}
/* 背景柔光渐变云层 */
.login-bg::after{
  content:"";position:absolute;inset:auto -20% -20% -20%;height:70%;
  background:radial-gradient(600px 300px at 70% 30%, rgba(255,255,255,.25), transparent 60%),
             radial-gradient(500px 260px at 30% 80%, rgba(255,255,255,.18), transparent 60%);
  filter:blur(20px);opacity:.8;pointer-events:none;
  animation:drift 20s ease-in-out infinite alternate;
}

@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
@keyframes hueRotate{to{filter:hue-rotate(360deg)}}
@keyframes floatDots{
  0%{background-position:0 0, 120px 120px}
  100%{background-position:24px -24px, 152px 152px}
}
@keyframes drift{
  0%{transform:translateY(0) translateX(0)}
  100%{transform:translateY(-10px) translateX(6px)}
}

/* 用户减少动画偏好时降级 */
@media (prefers-reduced-motion:reduce){
  .login-bg,.bg-pattern,.login-bg::after{animation:none}
}

/* 主应用布局 */
.main-app{display:flex;flex-direction:column;height:100vh}

/* 顶部导航 */
.top-navbar{
  height:var(--navbar-height);background:var(--bg-primary);border-bottom:1px solid var(--border-color);
  display:flex;align-items:center;justify-content:space-between;padding:0 1rem;position:fixed;inset:0 0 auto 0;
  z-index:1000;box-shadow:var(--shadow-sm)
}
.navbar-left{display:flex;align-items:center;gap:1rem}
.sidebar-toggle{
  background:none;border:none;font-size:1.25rem;color:var(--text-secondary);cursor:pointer;
  padding:8px;border-radius:10px;transition:var(--transition)
}
.sidebar-toggle:hover{background:var(--gray-100);color:var(--text-primary)}
.logo-small{display:flex;align-items:center;gap:8px;font-weight:700;color:var(--text-primary)}
.logo-small i{color:var(--primary-color);font-size:1.25rem}
.navbar-right{display:flex;align-items:center}
.user-info{
  position:relative;display:flex;align-items:center;gap:8px;cursor:pointer;padding:8px 12px;
  border-radius:12px;transition:var(--transition)
}
.user-info:hover{background:var(--gray-100)}
.user-avatar{
  width:32px;height:32px;background:var(--primary-color);border-radius:50%;
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:.875rem;box-shadow:inset 0 0 0 2px rgb(255 255 255 / .2)
}
.user-dropdown{
  position:absolute;top:100%;right:0;background:var(--bg-primary);border:1px solid var(--border-color);
  border-radius:12px;box-shadow:var(--shadow-lg);min-width:190px;opacity:0;visibility:hidden;
  transform:translateY(-10px);transition:var(--transition);z-index:1001;overflow:hidden
}
.user-info:hover .user-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.user-dropdown a{display:flex;align-items:center;gap:8px;padding:12px 16px;color:var(--text-primary);text-decoration:none;transition:var(--transition)}
.user-dropdown a:hover{background:var(--gray-100)}

/* 侧边栏 */
.sidebar{
  width:var(--sidebar-width);background:var(--bg-primary);border-right:1px solid var(--border-color);
  position:fixed;top:var(--navbar-height);left:0;bottom:0;overflow-y:auto;transition:var(--transition-slow);z-index:999
}
.sidebar.collapsed{transform:translateX(-100%)}
.sidebar-nav{padding:1rem 0}
.nav-menu{list-style:none}
.nav-item{margin-bottom:4px}
.nav-link{
  display:flex;align-items:center;gap:12px;padding:12px 24px;color:var(--text-secondary);
  text-decoration:none;transition:var(--transition);position:relative;border-radius:0
}
.nav-link:hover{background:var(--gray-100);color:var(--text-primary)}
.nav-item.active .nav-link{
  background:linear-gradient(90deg, var(--primary-light), transparent 80%);
  color:var(--primary-color);font-weight:600
}
.nav-item.active .nav-link::before{content:'';position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--primary-color)}
.nav-link i{font-size:1.125rem;width:20px;text-align:center}

/* 主内容 */
.main-content{
  margin-left:var(--sidebar-width);margin-top:var(--navbar-height);padding:2rem;
  min-height:calc(100vh - var(--navbar-height));transition:var(--transition-slow)
}
.sidebar.collapsed + .main-content{margin-left:0}

/* 页面容器 */
.page{display:none}
.page.active{display:block}
.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:2rem;flex-wrap:wrap;gap:1rem}
.page-header h2{font-size:1.875rem;font-weight:800;color:var(--text-primary);letter-spacing:.2px}
.page-actions{display:flex;gap:12px;flex-wrap:wrap}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border:none;border-radius:12px;
  font-size:.875rem;font-weight:600;cursor:pointer;transition:var(--transition);text-decoration:none;white-space:nowrap
}
.btn-primary{background:var(--primary-color);color:#fff;box-shadow:0 6px 14px -6px rgba(37,99,235,.5)}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-secondary{background:var(--gray-100);color:var(--text-primary);border:1px solid var(--border-color)}
.btn-secondary:hover{background:var(--gray-200)}
.btn-sm{padding:6px 12px;font-size:.8125rem;border-radius:10px}

/* 统计卡片 */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit, minmax(260px,1fr));gap:1.5rem;margin-bottom:2rem}
.stat-card{
  background:var(--bg-primary);border-radius:16px;padding:1.25rem 1.5rem;box-shadow:var(--shadow);border:1px solid var(--border-color);
  transition:var(--transition);display:flex;align-items:center;gap:1rem
}
.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.stat-icon{width:52px;height:52px;border-radius:14px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;color:var(--primary-color);font-size:1.25rem}
.stat-content h3{font-size:2rem;font-weight:800;color:var(--text-primary);margin-bottom:4px;letter-spacing:.2px}
.stat-content p{color:var(--text-secondary);font-size:.9rem}

/* 图表区 */
.charts-grid{display:grid;grid-template-columns:2fr 1fr;gap:1.5rem;margin-bottom:2rem}
.chart-card{background:var(--bg-primary);border-radius:16px;border:1px solid var(--border-color);box-shadow:var(--shadow);overflow:hidden}
.chart-header{padding:1.25rem 1.5rem 0;display:flex;align-items:center;justify-content:space-between}
.chart-header h3{font-size:1.125rem;font-weight:700;color:var(--text-primary)}
.chart-content{padding:1.5rem}

/* 排行榜（备用） */
.ranking-list{display:flex;flex-direction:column;gap:12px}
.ranking-item{display:flex;align-items:center;gap:12px;padding:12px;background:var(--bg-secondary);border-radius:12px;transition:var(--transition)}
.ranking-item:hover{background:var(--gray-200)}
.ranking-number{width:24px;height:24px;border-radius:50%;background:var(--primary-color);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.8125rem;font-weight:700}
.ranking-info{flex:1}
.ranking-name{font-weight:600;color:var(--text-primary);margin-bottom:2px}
.ranking-count{font-size:.875rem;color:var(--text-secondary)}

/* 表格 */
.table-card{background:var(--bg-primary);border-radius:16px;border:1px solid var(--border-color);box-shadow:var(--shadow);overflow:hidden}
.table-header{padding:1.25rem 1.5rem;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem}
.table-header h3{font-size:1.125rem;font-weight:700;color:var(--text-primary)}
.table-controls{display:flex;gap:8px;align-items:center}
.search-input{
  padding:10px 12px;border:1.6px solid var(--border-color);border-radius:12px;font-size:.875rem;width:220px;transition:var(--transition);
  background:var(--bg-primary)
}
.search-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 4px var(--primary-light)}
.table-content{overflow:auto;max-height:68vh}

/* 粘性表头，提高可读性 */
.data-table{width:100%;border-collapse:separate;border-spacing:0}
.data-table th,.data-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border-color)}
.data-table th{
  position:sticky;top:0;background:linear-gradient(#f9fbff,#f6f8fe);
  font-weight:700;color:var(--text-primary);font-size:.85rem;z-index:1
}
.data-table td{color:var(--text-secondary);font-size:.875rem}
.data-table tbody tr{transition:background .15s ease}
.data-table tbody tr:hover{background:var(--bg-secondary)}
.table-actions .btn{opacity:.9}
.table-actions .btn:hover{opacity:1}

/* 空状态 */
.empty{padding:1.25rem;color:var(--text-muted)}

/* 占位卡片 */
.coming-soon{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:240px;text-align:center;color:var(--text-muted)}
.coming-soon i{font-size:3rem;margin-bottom:.75rem;color:var(--gray-300)}
.coming-soon h3{font-size:1.25rem;margin-bottom:.25rem;color:var(--text-secondary)}

/* 模态框 */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:2000;opacity:0;visibility:hidden;transition:var(--transition)}
.modal.active{opacity:1;visibility:visible}
.modal-content{
  background:var(--bg-primary);border-radius:16px;box-shadow:var(--shadow-lg);max-width:560px;width:92%;
  max-height:90vh;overflow-y:auto;transform:translateY(12px);transition:var(--transition)
}
.modal.active .modal-content{transform:translateY(0)}
.modal-header{padding:1.25rem 1.25rem;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between}
.modal-header h3{font-size:1.2rem;font-weight:700;color:var(--text-primary)}
.modal-close{background:none;border:none;font-size:1.1rem;color:var(--text-muted);cursor:pointer;padding:6px;border-radius:8px;transition:var(--transition)}
.modal-close:hover{background:var(--gray-100);color:var(--text-primary)}
.modal-body{padding:1.25rem}

/* Toast */
.toast{
  position:fixed;top:20px;right:20px;background:var(--bg-primary);border:1px solid var(--border-color);
  border-radius:14px;box-shadow:var(--shadow-lg);padding:16px;min-width:300px;z-index:3000;
  transform:translateX(100%);transition:var(--transition-slow)
}
.toast.show{transform:translateX(0)}
.toast-content{display:flex;align-items:center;gap:12px}
.toast-icon{font-size:1.25rem}
.toast.success .toast-icon{color:var(--success-color)}
.toast.error .toast-icon{color:var(--error-color)}
.toast.warning .toast-icon{color:var(--warning-color)}
.toast-message{color:var(--text-primary);font-weight:600}

/* 可访问性：仅键盘焦点可见 */
:where(button, a, input, textarea, select):focus-visible{
  outline:none;box-shadow:0 0 0 4px var(--primary-light), 0 0 0 1.5px var(--primary-color)
}

/* Utility */
.hidden{display:none!important}
.d-flex{display:flex!important}
.d-block{display:block!important}
.modal-open{overflow:hidden}
.text-success{color:var(--success-color)}
.text-error{color:var(--error-color)}
.text-center{text-align:center}

/* 表单动作容器（避免内联样式） */
.form-actions{display:flex;justify-content:flex-end;gap:1rem;margin-top:1.5rem}

/* 响应式优化 */
@media (max-width: 1024px){
  .charts-grid{grid-template-columns:1fr}
}
@media (max-width: 768px){
  .main-content{padding:1rem}
  .page-header h2{font-size:1.5rem}
  .stats-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
  .table-content{max-height:60vh}
  .search-input{width:180px}
}