/* ===== 登录/注册页通用 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1890ff 0%, #096dd9 50%, #0050b3 100%);
    padding: 20px;
    position: relative;
    overflow: hidden;
}
.login-page::before {
    content: '';
    position: absolute;
    top: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
    border-radius: 50%;
}
.login-page::after {
    content: '';
    position: absolute;
    bottom: -20%;
    right: -5%;
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
    border-radius: 50%;
}
.login-box {
    width: 100%;
    max-width: 420px;
    background: #fff;
    border-radius: 16px;
    padding: 44px 40px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.25);
    position: relative;
    z-index: 1;
}
.login-title {
    text-align: center;
    font-size: 26px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 8px;
}
.login-subtitle {
    text-align: center;
    color: #999;
    font-size: 14px;
    margin-bottom: 32px;
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 14px;
    color: #555;
    margin-bottom: 8px;
    font-weight: 500;
}
.form-group input {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    border: 1.5px solid #e0e0e0;
    border-radius: 8px;
    outline: none;
    transition: all 0.25s;
    background: #fafafa;
    color: #333;
}
.form-group input:focus {
    border-color: #1890ff;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(24,144,255,0.1);
}
.form-group input::placeholder {
    color: #bbb;
}
.form-group input[disabled] {
    background: #f5f5f5;
    color: #999;
    cursor: not-allowed;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s;
    border: none;
    text-align: center;
}
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-block { width: 100%; }
.btn-primary {
    background: linear-gradient(135deg, #1890ff, #096dd9);
    color: #fff;
}
.btn-primary:hover {
    background: linear-gradient(135deg, #096dd9, #0050b3);
    box-shadow: 0 4px 16px rgba(24,144,255,0.35);
    transform: translateY(-1px);
}

/* ===== 提示框 ===== */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}
.alert-success {
    background: #f6ffed;
    border: 1px solid #b7eb8f;
    color: #389e0d;
}
.alert-error {
    background: #fff2f0;
    border: 1px solid #ffccc7;
    color: #cf1322;
}

/* ===== 底部链接 ===== */
.login-footer {
    text-align: center;
    margin-top: 28px;
    font-size: 13px;
    color: #999;
}
.login-footer a {
    color: #1890ff;
    text-decoration: none;
    transition: color 0.2s;
}
.login-footer a:hover {
    color: #096dd9;
    text-decoration: underline;
}

/* ===== 响应式：平板 ===== */
@media (max-width: 1023px) {
    .login-box { padding: 40px 36px; }
}

/* ===== 响应式：手机 ===== */
@media (max-width: 767px) {
    .login-page { padding: 16px; }
    .login-box {
        padding: 32px 24px;
        border-radius: 14px;
    }
    .login-title { font-size: 22px; }
    .login-subtitle { font-size: 13px; margin-bottom: 24px; }
    .form-group { margin-bottom: 16px; }
    .form-group input { padding: 11px 14px; font-size: 14px; }
    .btn-lg { padding: 12px; font-size: 15px; }
}

/* ===== 响应式：小屏手机 ===== */
@media (max-width: 479px) {
    .login-page { padding: 12px; }
    .login-box { padding: 28px 20px; }
    .login-title { font-size: 20px; }
}