body {
    background: #f7fafd;
    font-family: 'Segoe UI', 'PingFang SC', 'Hiragino Sans', Arial, sans-serif;
    margin: 0;
    padding: 0;
}
.topnav {
    background:#3183f4;
    color:#fff;
    height:58px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:0 36px;
    font-size: 1rem;
}
.topnav .logo {
    font-size:22px;
    font-weight:700;
    letter-spacing:2px;
}
.topnav .menu {
    display: flex;
    gap: 30px;
}
.topnav .menu a {
    color:#fff;
    text-decoration:none;
    padding: 0 5px;
    font-size: 1.06rem;
    line-height: 58px;
    border-bottom: 2px solid transparent;
    transition: border .18s;
}
.topnav .menu a.active,
.topnav .menu a:hover {
    border-bottom: 2px solid #fff;
}
.topnav .user {
    margin-left: 24px;
    font-size: 1.01rem;
}
.topnav .user a {
    color:#fff;
    text-decoration:none;
    margin-left: 12px;
}
.topnav .user a:hover { text-decoration: underline; }

.main-content {
    max-width: 980px;
    margin: 42px auto 0 auto;
    padding: 0 18px 38px 18px;
    width: 100%;
}

.content-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(49,131,244,0.08);
    padding: 38px 32px 24px 32px;
    margin-bottom: 32px;
}

.card-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 18px;
    flex-wrap: wrap;
}
.card-title {
    font-size: 1.45rem;
    font-weight: 700;
    color: #3183f4;
    margin: 0;
}
.card-actions a {
    color: #3183f4;
    margin-left: 18px;
    font-size: 1rem;
    text-decoration: none;
}
.card-actions a:hover { text-decoration: underline; }

.button {
    background: #3183f4;
    color: #fff;
    border: none;
    padding: 9px 24px;
    border-radius: 7px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 20px;
    margin-top: 2px;
    transition: background 0.2s;
    display: inline-block;
}
.button:hover { background: #266ad1; }

.table {
    width: 100%;
    min-width: 300px;
    border-collapse: collapse;
    font-size: 15px;
    background: #fff;
    margin: 0;
}
.table th, .table td {
    padding: 10px 8px;
    border-bottom: 1px solid #e9eff6;
    text-align: left;
}
.table th {
    background: #f3f7fd;
    color: #3183f4;
    font-weight: 600;
}
.table td { color: #222; }
.actions a {
    color: #3183f4;
    margin-right: 8px;
    text-decoration: none;
}
.actions a:hover { text-decoration: underline; }

@media (max-width: 1100px) {
    .main-content, .content-card { max-width: 100vw; padding: 12px 2vw;}
    .main-content { margin: 16px auto 0 auto;}
}
/* 通用表单美化 */
.form-group {
    margin-bottom: 22px;
}
.form-group label {
    font-size: 1.13rem;
    font-weight: 500;
    color: #222;
    margin-bottom: 7px;
    display: block;
    letter-spacing: 0.5px;
}

/* 主要输入框美化 */
input[type="text"],
input[type="email"],
input[type="password"],
textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 11px 14px;
    font-size: 1.1rem;
    border: 1.5px solid #e2e6ef;
    border-radius: 8px;
    background: #fafdff;
    outline: none;
    transition: border-color 0.18s, box-shadow 0.18s, background 0.18s;
    margin-top: 4px;
}
input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
textarea:focus {
    border-color: #3183f4;
    background: #f3f7fd;
    box-shadow: 0 0 0 2px rgba(49,131,244,0.08);
}

/* 禁用/只读样式 */
input[readonly], input:disabled {
    background: #f3f7fd;
    color: #aaa;
}

/* 提示小字 */
.form-group small {
    color: #888;
    font-size: 13px;
    margin-top: 2px;
    display: inline-block;
}
.button, a.button {
    background: #3183f4;
    color: #fff !important;
    border: none;
    padding: 9px 24px;
    border-radius: 12px;
    font-size: 1.15rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 20px;
    margin-top: 2px;
    transition: background 0.2s;
    display: inline-block;
    letter-spacing: 1px;
    box-shadow: 0 2px 8px rgba(49,131,244,0.06);
    text-decoration: none !important;
}
.button:hover, a.button:hover {
    background: #1761a0;
    color: #fff !important;
}
.button:active, a.button:active {
    background: #1452a5;
    color: #fff !important;
}
a, a:visited {
    color: #3183f4;
    text-decoration: none;
    transition: color .18s;
}
a:hover, a:active {
    color: #1761a0;
    text-decoration: none;
}
/* 通用美化所有 select 下拉框 */
select {
    appearance: none; /* 去除系统默认样式 */
    -webkit-appearance: none;
    -moz-appearance: none;
    background-color: #f8fafc;
    border: 1px solid #e4e7ed;
    border-radius: 8px;
    padding: 10px 38px 10px 12px;
    font-size: 16px;
    color: #222;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
    box-shadow: 0 1px 4px #0001;
    background-image: url("data:image/svg+xml;charset=UTF-8,<svg width='14' height='14' viewBox='0 0 1024 1024' fill='gray' xmlns='http://www.w3.org/2000/svg'><path d='M512 672c-8.2 0-16.4-3.1-22.6-9.4l-256-256c-12.5-12.5-12.5-32.8 0-45.3s32.8-12.5 45.3 0L512 594.7l233.4-233.4c12.5-12.5 32.8-12.5 45.3 0s12.5 32.8 0 45.3l-256 256c-6.2 6.3-14.4 9.4-22.7 9.4z'/></svg>");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 18px 18px;
}
select:focus {
    border-color: #409eff;
    box-shadow: 0 0 0 2px #409eff22;
}
select:disabled {
    background-color: #f5f5f5;
    color: #bbb;
    cursor: not-allowed;
    border-style: dashed;
}