:root {
    --primary: #4F6EF7; --primary-dark: #3A54D4;
    --bg: #F8FAFC; --card-bg: #FFFFFF; --text: #1E293B;
    --text-secondary: #64748B; --border: #E2E8F0;
}
* { box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; margin: 0; }

/* 导航栏 */
.navbar-custom { background: var(--card-bg); border-bottom: 1px solid var(--border); padding: 0 16px; height: 52px; display: flex; align-items: center; justify-content: space-between; }
.navbar-brand { font-size: 18px; font-weight: 700; color: var(--primary); text-decoration: none; }
.navbar-brand span { color: var(--text); }
.nav-links { display: flex; align-items: center; gap: 12px; }
.nav-links a { color: var(--text-secondary); text-decoration: none; font-size: 13px; font-weight: 500; }
.btn-primary-sm { background: var(--primary); color: #fff; border: none; padding: 4px 12px; border-radius: 4px; font-size: 12px; text-decoration: none; }

/* 卡片 */
.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; margin-bottom: 16px; box-shadow: 0 1px 3px rgba(0,0,0,0.04); }
.card-header { padding: 14px 16px; border-bottom: 1px solid var(--border); font-weight: 600; font-size: 13px; background: #fff; border-radius: 8px 8px 0 0; }
.card-body { padding: 16px; }

/* 按钮 */
.btn-sm { padding: 5px 12px; font-size: 11px; border-radius: 5px; cursor: pointer; border: 1px solid transparent; font-weight: 500; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-outline { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: #EEF2FF; }
.btn-danger-outline { background: #fff; color: #EF4444; border-color: #EF4444; }

/* 表单 */
.form-group { margin-bottom: 14px; }
.form-label { font-size: 12px; font-weight: 500; margin-bottom: 3px; display: block; }
.form-control { border: 1px solid var(--border); border-radius: 5px; font-size: 13px; padding: 7px 10px; width: 100%; }
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(79,110,247,0.1); outline: none; }
textarea.form-control { resize: vertical; min-height: 72px; font-size: 12px; }

/* 下拉框 */
.form-select {
    appearance: none; -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%2364748B' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat; background-position: right 10px center; background-size: 14px;
    border: 1px solid var(--border); border-radius: 5px; font-size: 13px; padding: 7px 32px 7px 10px; width: 100%; max-width: 100%;
    cursor: pointer; transition: border-color 0.2s, box-shadow 0.2s; color: var(--text); background-color: var(--card-bg);
}
.form-select:hover { border-color: var(--primary); }
.form-select:focus { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(79,110,247,0.1); outline: none; }
.form-select option { padding: 8px 12px; font-size: 13px; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* 表格 */
.table { width: 100%; font-size: 12px; }
.table th { color: var(--text-secondary); font-weight: 500; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.table td { padding: 8px 10px; border-bottom: 1px solid var(--border); }

/* 标签 */
.badge { padding: 2px 6px; border-radius: 10px; font-size: 10px; font-weight: 500; }
.badge-success { background: #DCFCE7; color: #16A34A; }
.badge-warning { background: #FEF3C7; color: #D97706; }
.badge-danger { background: #FEE2E2; color: #DC2626; }

/* Toast */
.toast { position: fixed; top: 16px; right: 16px; background: #1E293B; color: #fff; padding: 10px 16px; border-radius: 6px; font-size: 12px; z-index: 9999; display: none; max-width: 300px; }

/* 空状态 */
.empty-state { text-align: center; padding: 30px 16px; color: var(--text-secondary); font-size: 13px; }

/* 容器 */
.container-main { max-width: 800px; margin: 0 auto; padding: 30px 20px; }

/* 登录/注册卡片 */
.login-card { width: 380px; max-width: 90vw; margin: 0 auto; }
.login-card .card { border: none; box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
.login-card .card-header { text-align: center; padding: 20px; font-size: 16px; }
.login-card .card-body { padding: 24px; }

/* 账户布局 */
.app { display: flex; min-height: 100vh; }
.sidebar { width: 270px; background: var(--card-bg); border-right: 1px solid var(--border); padding: 20px 0; flex-shrink: 0; overflow-y: auto; }
.sidebar .user-info { padding: 0 16px 16px; border-bottom: 1px solid var(--border); margin-bottom: 8px; }
.sidebar .user-info .avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.sidebar .user-info .name { font-weight: 600; font-size: 13px; }
.sidebar .user-info .uid { font-size: 11px; color: var(--text-secondary); }
.sidebar .menu { list-style: none; padding: 0; margin: 0; }
.sidebar .menu li { padding: 0 10px; }
.sidebar .menu li a { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 5px; color: var(--text-secondary); text-decoration: none; font-size: 12px; font-weight: 500; }
.sidebar .menu li a:hover { background: #F1F5F9; color: var(--text); }
.sidebar .menu li a.active { background: #EEF2FF; color: var(--primary); font-weight: 600; }
.main { flex: 1; overflow-y: auto; }
.topbar { background: var(--card-bg); border-bottom: 1px solid var(--border); padding: 12px 20px; display: flex; align-items: center; justify-content: space-between; }
.topbar .page-title { font-size: 15px; font-weight: 600; }
.content { padding: 20px; max-width: 700px; margin: 0 auto; }
.upload-area {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: #FAFBFC;
}
.upload-area:hover {
    border-color: var(--primary);
    background: #F0F4FF;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .content { padding: 14px; }
    .hide-mobile { display: none; }
    .navbar-brand { font-size: 16px; }
    .container-main { padding: 15px; }
}